Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

170 files changed, 16579 insertions, 0 deletions

diff --git a/src/messages/MAuth.h b/src/messages/MAuth.h
new file mode 100644
index 000000000..8e066a3cf
--- /dev/null
+++ b/src/messages/MAuth.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MAUTH_H
+#define CEPH_MAUTH_H
+
+#include <string_view>
+
+#include "include/encoding.h"
+
+#include "msg/Message.h"
+#include "msg/MessageRef.h"
+#include "messages/PaxosServiceMessage.h"
+
+class MAuth final : public PaxosServiceMessage {
+public:
+  __u32 protocol;
+  ceph::buffer::list auth_payload;
+  epoch_t monmap_epoch;
+
+  /* if protocol == 0, then auth_payload is a set<__u32> listing protocols the client supports */
+
+  MAuth() : PaxosServiceMessage{CEPH_MSG_AUTH, 0}, protocol(0), monmap_epoch(0) { }
+private:
+  ~MAuth() final {}
+
+public:
+  std::string_view get_type_name() const override { return "auth"; }
+  void print(std::ostream& out) const override {
+    out << "auth(proto " << protocol << " " << auth_payload.length() << " bytes"
+	<< " epoch " << monmap_epoch << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(protocol, p);
+    decode(auth_payload, p);
+    if (!p.end())
+      decode(monmap_epoch, p);
+    else
+      monmap_epoch = 0;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(protocol, payload);
+    encode(auth_payload, payload);
+    encode(monmap_epoch, payload);
+  }
+  ceph::buffer::list& get_auth_payload() { return auth_payload; }
+};
+
+#endif
diff --git a/src/messages/MAuthReply.h b/src/messages/MAuthReply.h
new file mode 100644
index 000000000..1c7c5e506
--- /dev/null
+++ b/src/messages/MAuthReply.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MAUTHREPLY_H
+#define CEPH_MAUTHREPLY_H
+
+#include "msg/Message.h"
+#include "common/errno.h"
+
+class MAuthReply final : public Message {
+public:
+  __u32 protocol;
+  errorcode32_t result;
+  uint64_t global_id;      // if zero, meaningless
+  std::string result_msg;
+  ceph::buffer::list result_bl;
+
+  MAuthReply() : Message(CEPH_MSG_AUTH_REPLY), protocol(0), result(0), global_id(0) {}
+  MAuthReply(__u32 p, ceph::buffer::list *bl = NULL, int r = 0, uint64_t gid=0, const char *msg = "") :
+    Message(CEPH_MSG_AUTH_REPLY),
+    protocol(p), result(r), global_id(gid),
+    result_msg(msg) {
+    if (bl)
+      result_bl = *bl;
+  }
+private:
+  ~MAuthReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "auth_reply"; }
+  void print(std::ostream& o) const override {
+    o << "auth_reply(proto " << protocol << " " << result << " " << cpp_strerror(result);
+    if (result_msg.length())
+      o << ": " << result_msg;
+    o << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(protocol, p);
+    decode(result, p);
+    decode(global_id, p);
+    decode(result_bl, p);
+    decode(result_msg, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(protocol, payload);
+    encode(result, payload);
+    encode(global_id, payload);
+    encode(result_bl, payload);
+    encode(result_msg, payload);
+  }
+};
+
+#endif
diff --git a/src/messages/MBackfillReserve.h b/src/messages/MBackfillReserve.h
new file mode 100644
index 000000000..fbb262b83
--- /dev/null
+++ b/src/messages/MBackfillReserve.h
@@ -0,0 +1,180 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MBACKFILL_H
+#define CEPH_MBACKFILL_H
+
+#include "msg/Message.h"
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MBackfillReserve : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 5;
+  static constexpr int COMPAT_VERSION = 4;
+public:
+  spg_t pgid;
+  epoch_t query_epoch;
+  enum {
+    REQUEST = 0,   // primary->replica: please reserve a slot
+    GRANT = 1,     // replica->primary: ok, i reserved it
+    REJECT_TOOFULL = 2,    // replica->primary: too full, sorry, try again later (*)
+    RELEASE = 3,   // primary->replcia: release the slot i reserved before
+    REVOKE_TOOFULL = 4,   // replica->primary: too full, stop backfilling
+    REVOKE = 5,    // replica->primary: i'm taking back the slot i gave you
+    // (*) NOTE: prior to luminous, REJECT was overloaded to also mean release
+  };
+  uint32_t type;
+  uint32_t priority;
+  int64_t primary_num_bytes;
+  int64_t shard_num_bytes;
+
+  spg_t get_spg() const {
+    return pgid;
+  }
+  epoch_t get_map_epoch() const {
+    return query_epoch;
+  }
+  epoch_t get_min_epoch() const {
+    return query_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    switch (type) {
+    case REQUEST:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RequestBackfillPrio(priority, primary_num_bytes, shard_num_bytes));
+    case GRANT:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteBackfillReserved());
+    case REJECT_TOOFULL:
+      // NOTE: this is replica -> primary "i reject your request"
+      //      and also primary -> replica "cancel my previously-granted request"
+      //                                  (for older peers)
+      //      and also replica -> primary "i revoke your reservation"
+      //                                  (for older peers)
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteReservationRejectedTooFull());
+    case RELEASE:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteReservationCanceled());
+    case REVOKE_TOOFULL:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteReservationRevokedTooFull());
+    case REVOKE:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteReservationRevoked());
+    default:
+      ceph_abort();
+    }
+  }
+
+  MBackfillReserve()
+    : MOSDPeeringOp{MSG_OSD_BACKFILL_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      query_epoch(0), type(-1), priority(-1), primary_num_bytes(0),
+      shard_num_bytes(0) {}
+  MBackfillReserve(int type,
+		   spg_t pgid,
+		   epoch_t query_epoch, unsigned prio = -1,
+		   int64_t primary_num_bytes = 0,
+                   int64_t shard_num_bytes = 0)
+    : MOSDPeeringOp{MSG_OSD_BACKFILL_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid), query_epoch(query_epoch),
+      type(type), priority(prio), primary_num_bytes(primary_num_bytes),
+      shard_num_bytes(shard_num_bytes) {}
+
+  std::string_view get_type_name() const override {
+    return "MBackfillReserve";
+  }
+
+  void inner_print(std::ostream& out) const override {
+    switch (type) {
+    case REQUEST:
+      out << "REQUEST";
+      break;
+    case GRANT:
+      out << "GRANT";
+      break;
+    case REJECT_TOOFULL:
+      out << "REJECT_TOOFULL";
+      break;
+    case RELEASE:
+      out << "RELEASE";
+      break;
+    case REVOKE_TOOFULL:
+      out << "REVOKE_TOOFULL";
+      break;
+    case REVOKE:
+      out << "REVOKE";
+      break;
+    }
+    if (type == REQUEST) out << " prio: " << priority;
+    return;
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(pgid.pgid, p);
+    decode(query_epoch, p);
+    decode(type, p);
+    decode(priority, p);
+    decode(pgid.shard, p);
+    if (header.version >= 5) {
+      decode(primary_num_bytes, p);
+      decode(shard_num_bytes, p);
+    } else {
+      primary_num_bytes = 0;
+      shard_num_bytes = 0;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (!HAVE_FEATURE(features, RECOVERY_RESERVATION_2)) {
+      header.version = 3;
+      header.compat_version = 3;
+      encode(pgid.pgid, payload);
+      encode(query_epoch, payload);
+      encode((type == RELEASE || type == REVOKE_TOOFULL || type == REVOKE) ?
+	       REJECT_TOOFULL : type, payload);
+      encode(priority, payload);
+      encode(pgid.shard, payload);
+      return;
+    }
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(pgid.pgid, payload);
+    encode(query_epoch, payload);
+    encode(type, payload);
+    encode(priority, payload);
+    encode(pgid.shard, payload);
+    encode(primary_num_bytes, payload);
+    encode(shard_num_bytes, payload);
+  }
+};
+
+#endif
diff --git a/src/messages/MCacheExpire.h b/src/messages/MCacheExpire.h
new file mode 100644
index 000000000..a01276b11
--- /dev/null
+++ b/src/messages/MCacheExpire.h
@@ -0,0 +1,114 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCACHEEXPIRE_H
+#define CEPH_MCACHEEXPIRE_H
+
+#include <string_view>
+#include "mds/mdstypes.h"
+#include "messages/MMDSOp.h"
+
+class MCacheExpire final : public MMDSOp {
+private:
+  __s32 from;
+
+public:
+  /*
+    group things by realm (auth delgation root), since that's how auth is determined.
+    that makes it less work to process when exports are in progress.
+  */
+  struct realm {
+    std::map<vinodeno_t, uint32_t> inodes;
+    std::map<dirfrag_t, uint32_t> dirs;
+    std::map<dirfrag_t, std::map<std::pair<std::string,snapid_t>,uint32_t> > dentries;
+
+    void merge(const realm& o) {
+      inodes.insert(o.inodes.begin(), o.inodes.end());
+      dirs.insert(o.dirs.begin(), o.dirs.end());
+      for (const auto &p : o.dentries) {
+        auto em = dentries.emplace(std::piecewise_construct, std::forward_as_tuple(p.first), std::forward_as_tuple(p.second));
+        if (!em.second) {
+	  em.first->second.insert(p.second.begin(), p.second.end());
+        }
+      }
+    }
+
+    void encode(ceph::buffer::list &bl) const {
+      using ceph::encode;
+      encode(inodes, bl);
+      encode(dirs, bl);
+      encode(dentries, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &bl) {
+      using ceph::decode;
+      decode(inodes, bl);
+      decode(dirs, bl);
+      decode(dentries, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(realm)
+
+  std::map<dirfrag_t, realm> realms;
+
+  int get_from() const { return from; }
+
+protected:
+  MCacheExpire() : MMDSOp{MSG_MDS_CACHEEXPIRE}, from(-1) {}
+  MCacheExpire(int f) :
+    MMDSOp{MSG_MDS_CACHEEXPIRE},
+    from(f) { }
+  ~MCacheExpire() final {}
+
+public:
+  std::string_view get_type_name() const override { return "cache_expire";}
+
+  void add_inode(dirfrag_t r, vinodeno_t vino, unsigned nonce) {
+    realms[r].inodes[vino] = nonce;
+  }
+  void add_dir(dirfrag_t r, dirfrag_t df, unsigned nonce) {
+    realms[r].dirs[df] = nonce;
+  }
+  void add_dentry(dirfrag_t r, dirfrag_t df, std::string_view dn, snapid_t last, unsigned nonce) {
+    realms[r].dentries[df][std::pair<std::string,snapid_t>(dn,last)] = nonce;
+  }
+
+  void add_realm(dirfrag_t df, const realm& r) {
+    auto em = realms.emplace(std::piecewise_construct, std::forward_as_tuple(df), std::forward_as_tuple(r));
+    if (!em.second) {
+      em.first->second.merge(r);
+    }
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(from, p);
+    decode(realms, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(from, payload);
+    encode(realms, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+WRITE_CLASS_ENCODER(MCacheExpire::realm)
+
+#endif
diff --git a/src/messages/MClientCapRelease.h b/src/messages/MClientCapRelease.h
new file mode 100644
index 000000000..f4302d6bc
--- /dev/null
+++ b/src/messages/MClientCapRelease.h
@@ -0,0 +1,69 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCLIENTCAPRELEASE_H
+#define CEPH_MCLIENTCAPRELEASE_H
+
+#include "msg/Message.h"
+
+
+class MClientCapRelease final : public SafeMessage {
+ public:
+  std::string_view get_type_name() const override { return "client_cap_release";}
+  void print(std::ostream& out) const override {
+    out << "client_cap_release(" << caps.size() << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(head, p);
+    ceph::decode_nohead(head.num, caps, p);
+    if (header.version >= 2) {
+      decode(osd_epoch_barrier, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    head.num = caps.size();
+    encode(head, payload);
+    ceph::encode_nohead(caps, payload);
+    encode(osd_epoch_barrier, payload);
+  }
+
+  struct ceph_mds_cap_release head;
+  std::vector<ceph_mds_cap_item> caps;
+
+  // The message receiver must wait for this OSD epoch
+  // before actioning this cap release.
+  epoch_t osd_epoch_barrier = 0;
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  MClientCapRelease() : 
+    SafeMessage{CEPH_MSG_CLIENT_CAPRELEASE, HEAD_VERSION, COMPAT_VERSION}
+  {
+    memset(&head, 0, sizeof(head));
+  }
+  ~MClientCapRelease() final {}
+};
+
+#endif
diff --git a/src/messages/MClientCaps.h b/src/messages/MClientCaps.h
new file mode 100644
index 000000000..9d343a4af
--- /dev/null
+++ b/src/messages/MClientCaps.h
@@ -0,0 +1,360 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCLIENTCAPS_H
+#define CEPH_MCLIENTCAPS_H
+
+#include "msg/Message.h"
+#include "mds/mdstypes.h"
+#include "include/ceph_features.h"
+
+class MClientCaps final : public SafeMessage {
+private:
+
+  static constexpr int HEAD_VERSION = 12;
+  static constexpr int COMPAT_VERSION = 1;
+
+ public:
+  static constexpr unsigned FLAG_SYNC		= (1<<0);
+  static constexpr unsigned FLAG_NO_CAPSNAP		= (1<<1); // unused
+  static constexpr unsigned FLAG_PENDING_CAPSNAP	= (1<<2);
+
+  struct ceph_mds_caps_head head;
+
+  uint64_t size = 0;
+  uint64_t max_size = 0;
+  uint64_t truncate_size = 0;
+  uint64_t change_attr = 0;
+  uint32_t truncate_seq = 0;
+  utime_t mtime, atime, ctime, btime;
+  uint32_t time_warp_seq = 0;
+  int64_t nfiles = -1;		// files in dir
+  int64_t nsubdirs = -1;	// subdirs in dir
+
+  struct ceph_mds_cap_peer peer;
+
+  ceph::buffer::list snapbl;
+  ceph::buffer::list xattrbl;
+  ceph::buffer::list flockbl;
+  version_t  inline_version = 0;
+  ceph::buffer::list inline_data;
+
+  // Receivers may not use their new caps until they have this OSD map
+  epoch_t osd_epoch_barrier = 0;
+  ceph_tid_t oldest_flush_tid = 0;
+  uint32_t caller_uid = 0;
+  uint32_t caller_gid = 0;
+
+  /* advisory CLIENT_CAPS_* flags to send to mds */
+  unsigned flags = 0;
+
+  std::vector<uint8_t> fscrypt_auth;
+  std::vector<uint8_t> fscrypt_file;
+
+  int      get_caps() const { return head.caps; }
+  int      get_wanted() const { return head.wanted; }
+  int      get_dirty() const { return head.dirty; }
+  ceph_seq_t get_seq() const { return head.seq; }
+  ceph_seq_t get_issue_seq() const { return head.issue_seq; }
+  ceph_seq_t get_mseq() const { return head.migrate_seq; }
+
+  inodeno_t get_ino() const { return inodeno_t(head.ino); }
+  inodeno_t get_realm() const { return inodeno_t(head.realm); }
+  uint64_t get_cap_id() const { return head.cap_id; }
+
+  uint64_t get_size() const { return size;  }
+  uint64_t get_max_size() const { return max_size;  }
+  __u32 get_truncate_seq() const { return truncate_seq; }
+  uint64_t get_truncate_size() const { return truncate_size; }
+  utime_t get_ctime() const { return ctime; }
+  utime_t get_btime() const { return btime; }
+  utime_t get_mtime() const { return mtime; }
+  utime_t get_atime() const { return atime; }
+  __u64 get_change_attr() const { return change_attr; }
+  __u32 get_time_warp_seq() const { return time_warp_seq; }
+  uint64_t get_nfiles() const { return nfiles; }
+  uint64_t get_nsubdirs() const { return nsubdirs; }
+  bool dirstat_is_valid() const { return nfiles != -1 || nsubdirs != -1; }
+
+  const file_layout_t& get_layout() const {
+    return layout;
+  }
+
+  void set_layout(const file_layout_t &l) {
+    layout = l;
+  }
+
+  int       get_migrate_seq() const { return head.migrate_seq; }
+  int       get_op() const { return head.op; }
+
+  uint64_t get_client_tid() const { return get_tid(); }
+  void set_client_tid(uint64_t s) { set_tid(s); }
+
+  snapid_t get_snap_follows() const { return snapid_t(head.snap_follows); }
+  void set_snap_follows(snapid_t s) { head.snap_follows = s; }
+
+  void set_caps(int c) { head.caps = c; }
+  void set_wanted(int w) { head.wanted = w; }
+
+  void set_max_size(uint64_t ms) { max_size = ms; }
+
+  void set_migrate_seq(unsigned m) { head.migrate_seq = m; }
+  void set_op(int o) { head.op = o; }
+
+  void set_size(loff_t s) { size = s; }
+  void set_mtime(const utime_t &t) { mtime = t; }
+  void set_ctime(const utime_t &t) { ctime = t; }
+  void set_atime(const utime_t &t) { atime = t; }
+
+  void set_cap_peer(uint64_t id, ceph_seq_t seq, ceph_seq_t mseq, int mds, int flags) {
+    peer.cap_id = id;
+    peer.seq = seq;
+    peer.mseq = mseq;
+    peer.mds = mds;
+    peer.flags = flags;
+  }
+
+  void set_oldest_flush_tid(ceph_tid_t tid) { oldest_flush_tid = tid; }
+  ceph_tid_t get_oldest_flush_tid() const { return oldest_flush_tid; }
+
+  void clear_dirty() { head.dirty = 0; }
+
+protected:
+  MClientCaps()
+    : SafeMessage{CEPH_MSG_CLIENT_CAPS, HEAD_VERSION, COMPAT_VERSION} {}
+  MClientCaps(int op,
+	      inodeno_t ino,
+	      inodeno_t realm,
+	      uint64_t id,
+	      long seq,
+	      int caps,
+	      int wanted,
+	      int dirty,
+	      int mseq,
+              epoch_t oeb)
+    : SafeMessage{CEPH_MSG_CLIENT_CAPS, HEAD_VERSION, COMPAT_VERSION},
+      osd_epoch_barrier(oeb) {
+    memset(&head, 0, sizeof(head));
+    head.op = op;
+    head.ino = ino;
+    head.realm = realm;
+    head.cap_id = id;
+    head.seq = seq;
+    head.caps = caps;
+    head.wanted = wanted;
+    head.dirty = dirty;
+    head.migrate_seq = mseq;
+    memset(&peer, 0, sizeof(peer));
+  }
+  MClientCaps(int op,
+	      inodeno_t ino, inodeno_t realm,
+	      uint64_t id, int mseq, epoch_t oeb)
+    : SafeMessage{CEPH_MSG_CLIENT_CAPS, HEAD_VERSION, COMPAT_VERSION},
+      osd_epoch_barrier(oeb) {
+    memset(&head, 0, sizeof(head));
+    head.op = op;
+    head.ino = ino;
+    head.realm = realm;
+    head.cap_id = id;
+    head.migrate_seq = mseq;
+    memset(&peer, 0, sizeof(peer));
+  }
+  ~MClientCaps() final {}
+
+private:
+  file_layout_t layout;
+
+public:
+  std::string_view get_type_name() const override { return "Cfcap";}
+  void print(std::ostream& out) const override {
+    out << "client_caps(" << ceph_cap_op_name(head.op)
+	<< " ino " << inodeno_t(head.ino)
+	<< " " << head.cap_id
+	<< " seq " << head.seq;
+    if (get_tid())
+      out << " tid " << get_tid();
+    out << " caps=" << ccap_string(head.caps)
+	<< " dirty=" << ccap_string(head.dirty)
+	<< " wanted=" << ccap_string(head.wanted);
+    out << " follows " << snapid_t(head.snap_follows);
+    if (head.migrate_seq)
+      out << " mseq " << head.migrate_seq;
+
+    out << " size " << size << "/" << max_size;
+    if (truncate_seq)
+      out << " ts " << truncate_seq << "/" << truncate_size;
+    out << " mtime " << mtime
+        << " ctime " << ctime
+        << " change_attr " << change_attr;
+    if (time_warp_seq)
+      out << " tws " << time_warp_seq;
+
+    if (head.xattr_version)
+      out << " xattrs(v=" << head.xattr_version << " l=" << xattrbl.length() << ")";
+
+    out << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(head, p);
+    if (head.op == CEPH_CAP_OP_EXPORT) {
+      ceph_mds_caps_export_body body;
+      decode(body, p);
+      peer = body.peer;
+      p += (sizeof(ceph_mds_caps_non_export_body) -
+	    sizeof(ceph_mds_caps_export_body));
+    } else {
+      ceph_mds_caps_non_export_body body;
+      decode(body, p);
+      size = body.size;
+      max_size = body.max_size;
+      truncate_size = body.truncate_size;
+      truncate_seq = body.truncate_seq;
+      mtime = utime_t(body.mtime);
+      atime = utime_t(body.atime);
+      ctime = utime_t(body.ctime);
+      layout.from_legacy(body.layout);
+      time_warp_seq = body.time_warp_seq;
+    }
+    ceph::decode_nohead(head.snap_trace_len, snapbl, p);
+
+    ceph_assert(middle.length() == head.xattr_len);
+    if (head.xattr_len)
+      xattrbl = middle;
+
+    // conditionally decode flock metadata
+    if (header.version >= 2)
+      decode(flockbl, p);
+
+    if (header.version >= 3) {
+      if (head.op == CEPH_CAP_OP_IMPORT)
+	decode(peer, p);
+    }
+
+    if (header.version >= 4) {
+      decode(inline_version, p);
+      decode(inline_data, p);
+    } else {
+      inline_version = CEPH_INLINE_NONE;
+    }
+
+    if (header.version >= 5) {
+      decode(osd_epoch_barrier, p);
+    }
+    if (header.version >= 6) {
+      decode(oldest_flush_tid, p);
+    }
+    if (header.version >= 7) {
+      decode(caller_uid, p);
+      decode(caller_gid, p);
+    }
+    if (header.version >= 8) {
+      decode(layout.pool_ns, p);
+    }
+    if (header.version >= 9) {
+      decode(btime, p);
+      decode(change_attr, p);
+    }
+    if (header.version >= 10) {
+      decode(flags, p);
+    }
+    if (header.version >= 11) {
+      decode(nfiles, p);
+      decode(nsubdirs, p);
+    }
+    if (header.version >= 12) {
+      decode(fscrypt_auth, p);
+      decode(fscrypt_file, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    head.snap_trace_len = snapbl.length();
+    head.xattr_len = xattrbl.length();
+
+    encode(head, payload);
+    static_assert(sizeof(ceph_mds_caps_non_export_body) >
+		  sizeof(ceph_mds_caps_export_body));
+    if (head.op == CEPH_CAP_OP_EXPORT) {
+      ceph_mds_caps_export_body body;
+      body.peer = peer;
+      encode(body, payload);
+      payload.append_zero(sizeof(ceph_mds_caps_non_export_body) -
+			  sizeof(ceph_mds_caps_export_body));
+    } else {
+      ceph_mds_caps_non_export_body body;
+      body.size = size;
+      body.max_size = max_size;
+      body.truncate_size = truncate_size;
+      body.truncate_seq = truncate_seq;
+      mtime.encode_timeval(&body.mtime);
+      atime.encode_timeval(&body.atime);
+      ctime.encode_timeval(&body.ctime);
+      layout.to_legacy(&body.layout);
+      body.time_warp_seq = time_warp_seq;
+      encode(body, payload);
+    }
+    ceph::encode_nohead(snapbl, payload);
+
+    middle = xattrbl;
+
+    // conditionally include flock metadata
+    if (features & CEPH_FEATURE_FLOCK) {
+      encode(flockbl, payload);
+    } else {
+      header.version = 1;
+      return;
+    }
+
+    if (features & CEPH_FEATURE_EXPORT_PEER) {
+      if (head.op == CEPH_CAP_OP_IMPORT)
+	encode(peer, payload);
+    } else {
+      header.version = 2;
+      return;
+    }
+
+    if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
+      encode(inline_version, payload);
+      encode(inline_data, payload);
+    } else {
+      encode(inline_version, payload);
+      encode(ceph::buffer::list(), payload);
+    }
+
+    encode(osd_epoch_barrier, payload);
+    encode(oldest_flush_tid, payload);
+    encode(caller_uid, payload);
+    encode(caller_gid, payload);
+
+    encode(layout.pool_ns, payload);
+    encode(btime, payload);
+    encode(change_attr, payload);
+    encode(flags, payload);
+    encode(nfiles, payload);
+    encode(nsubdirs, payload);
+    encode(fscrypt_auth, payload);
+    encode(fscrypt_file, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientLease.h b/src/messages/MClientLease.h
new file mode 100644
index 000000000..e0c1d13c8
--- /dev/null
+++ b/src/messages/MClientLease.h
@@ -0,0 +1,97 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTLEASE_H
+#define CEPH_MCLIENTLEASE_H
+
+#include <string_view>
+
+#include "msg/Message.h"
+
+class MClientLease final : public SafeMessage {
+public:
+  struct ceph_mds_lease h;
+  std::string dname;
+  
+  int get_action() const { return h.action; }
+  ceph_seq_t get_seq() const { return h.seq; }
+  int get_mask() const { return h.mask; }
+  inodeno_t get_ino() const { return inodeno_t(h.ino); }
+  snapid_t get_first() const { return snapid_t(h.first); }
+  snapid_t get_last() const { return snapid_t(h.last); }
+
+protected:
+  MClientLease() : SafeMessage(CEPH_MSG_CLIENT_LEASE) {}
+  MClientLease(const MClientLease& m) :
+    SafeMessage(CEPH_MSG_CLIENT_LEASE),
+    h(m.h),
+    dname(m.dname) {}
+  MClientLease(int ac, ceph_seq_t seq, int m, uint64_t i, uint64_t sf, uint64_t sl) :
+    SafeMessage(CEPH_MSG_CLIENT_LEASE) {
+    h.action = ac;
+    h.seq = seq;
+    h.mask = m;
+    h.ino = i;
+    h.first = sf;
+    h.last = sl;
+    h.duration_ms = 0;
+  }
+  MClientLease(int ac, ceph_seq_t seq, int m, uint64_t i, uint64_t sf, uint64_t sl, std::string_view d) :
+    SafeMessage(CEPH_MSG_CLIENT_LEASE),
+    dname(d) {
+    h.action = ac;
+    h.seq = seq;
+    h.mask = m;
+    h.ino = i;
+    h.first = sf;
+    h.last = sl;
+    h.duration_ms = 0;
+  }
+  ~MClientLease() final {}
+
+public:
+  std::string_view get_type_name() const override { return "client_lease"; }
+  void print(std::ostream& out) const override {
+    out << "client_lease(a=" << ceph_lease_op_name(get_action())
+	<< " seq " << get_seq()
+	<< " mask " << get_mask();
+    out << " " << get_ino();
+    if (h.last != CEPH_NOSNAP)
+      out << " [" << snapid_t(h.first) << "," << snapid_t(h.last) << "]";
+    if (dname.length())
+      out << "/" << dname;
+    out << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(h, p);
+    decode(dname, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(h, payload);
+    encode(dname, payload);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientMetrics.h b/src/messages/MClientMetrics.h
new file mode 100644
index 000000000..5db391fe7
--- /dev/null
+++ b/src/messages/MClientMetrics.h
@@ -0,0 +1,56 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MDS_CLIENT_METRICS_H
+#define CEPH_MDS_CLIENT_METRICS_H
+
+#include <vector>
+
+#include "msg/Message.h"
+#include "include/cephfs/metrics/Types.h"
+
+class MClientMetrics final : public SafeMessage {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  std::vector<ClientMetricMessage> updates;
+
+protected:
+  MClientMetrics() : MClientMetrics(std::vector<ClientMetricMessage>{}) { }
+  MClientMetrics(std::vector<ClientMetricMessage> updates)
+    : SafeMessage(CEPH_MSG_CLIENT_METRICS, HEAD_VERSION, COMPAT_VERSION), updates(updates) {
+  }
+  ~MClientMetrics() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "client_metrics";
+  }
+
+  void print(std::ostream &out) const override {
+    out << "client_metrics ";
+    for (auto &i : updates) {
+      i.print(&out);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(updates, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto iter = payload.cbegin();
+    decode(updates, iter);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif // CEPH_MDS_CLIENT_METRICS_H
diff --git a/src/messages/MClientQuota.h b/src/messages/MClientQuota.h
new file mode 100644
index 000000000..ddad8fbdd
--- /dev/null
+++ b/src/messages/MClientQuota.h
@@ -0,0 +1,56 @@
+#ifndef CEPH_MCLIENTQUOTA_H
+#define CEPH_MCLIENTQUOTA_H
+
+#include "msg/Message.h"
+
+class MClientQuota final : public SafeMessage {
+public:
+  inodeno_t ino;
+  nest_info_t rstat;
+  quota_info_t quota;
+
+protected:
+  MClientQuota() :
+    SafeMessage{CEPH_MSG_CLIENT_QUOTA},
+    ino(0)
+  {}
+  ~MClientQuota() final {}
+
+public:
+  std::string_view get_type_name() const override { return "client_quota"; }
+  void print(std::ostream& out) const override {
+    out << "client_quota(";
+    out << " [" << ino << "] ";
+    out << rstat << " ";
+    out << quota;
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(rstat.rctime, payload);
+    encode(rstat.rbytes, payload);
+    encode(rstat.rfiles, payload);
+    encode(rstat.rsubdirs, payload);
+    encode(quota, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(rstat.rctime, p);
+    decode(rstat.rbytes, p);
+    decode(rstat.rfiles, p);
+    decode(rstat.rsubdirs, p);
+    decode(quota, p);
+    ceph_assert(p.end());
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientReclaim.h b/src/messages/MClientReclaim.h
new file mode 100644
index 000000000..edaf54b6b
--- /dev/null
+++ b/src/messages/MClientReclaim.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTRECLAIM_H
+#define CEPH_MCLIENTRECLAIM_H
+
+#include "msg/Message.h"
+
+class MClientReclaim final : public SafeMessage {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  static constexpr uint32_t FLAG_FINISH = 1U << 31;
+
+  uint32_t get_flags() const { return flags; }
+  std::string_view get_uuid() const { return uuid; }
+
+  std::string_view get_type_name() const override { return "client_reclaim"; }
+  void print(std::ostream& o) const override {
+    std::ios_base::fmtflags f(o.flags());
+    o << "client_reclaim(" << get_uuid() << " flags 0x" << std::hex << get_flags() << ")";
+    o.flags(f);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(uuid, payload);
+    encode(flags, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(uuid, p);
+    decode(flags, p);
+  }
+
+protected:
+  MClientReclaim() :
+    SafeMessage{CEPH_MSG_CLIENT_RECLAIM, HEAD_VERSION, COMPAT_VERSION} {}
+  MClientReclaim(std::string_view _uuid, uint32_t _flags) :
+    SafeMessage{CEPH_MSG_CLIENT_RECLAIM, HEAD_VERSION, COMPAT_VERSION},
+    uuid(_uuid), flags(_flags) {}
+private:
+  ~MClientReclaim() final {}
+
+  std::string uuid;
+  uint32_t flags = 0;
+
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientReclaimReply.h b/src/messages/MClientReclaimReply.h
new file mode 100644
index 000000000..23d3a51b0
--- /dev/null
+++ b/src/messages/MClientReclaimReply.h
@@ -0,0 +1,74 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTRECLAIMREPLY_H
+#define CEPH_MCLIENTRECLAIMREPLY_H
+
+#include "msg/Message.h"
+
+class MClientReclaimReply final : public SafeMessage {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  int32_t get_result() const { return result; }
+  void set_result(int r) { result = r; }
+  epoch_t get_epoch() const { return epoch; }
+  void set_epoch(epoch_t e) { epoch = e; }
+  const entity_addrvec_t& get_addrs() const { return addrs; }
+  void set_addrs(const entity_addrvec_t& _addrs)  { addrs = _addrs; }
+
+  std::string_view get_type_name() const override { return "client_reclaim_reply"; }
+  void print(std::ostream& o) const override {
+    o << "client_reclaim_reply(" << result << " e " << epoch << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(result, payload);
+    encode(epoch, payload);
+    encode(addrs, payload, features);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(result, p);
+    decode(epoch, p);
+    decode(addrs, p);
+  }
+
+protected:
+  MClientReclaimReply() :
+    MClientReclaimReply{0, 0}
+  {}
+  MClientReclaimReply(int r, epoch_t e=0) :
+    SafeMessage{CEPH_MSG_CLIENT_RECLAIM_REPLY, HEAD_VERSION, COMPAT_VERSION},
+    result(r), epoch(e) {}
+
+private:
+  ~MClientReclaimReply() final {}
+
+  int32_t result;
+  epoch_t epoch;
+  entity_addrvec_t addrs;
+
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientReconnect.h b/src/messages/MClientReconnect.h
new file mode 100644
index 000000000..96610b7b3
--- /dev/null
+++ b/src/messages/MClientReconnect.h
@@ -0,0 +1,178 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCLIENTRECONNECT_H
+#define CEPH_MCLIENTRECONNECT_H
+
+#include "msg/Message.h"
+#include "mds/mdstypes.h"
+#include "include/ceph_features.h"
+
+
+class MClientReconnect final : public SafeMessage {
+private:
+  static constexpr int HEAD_VERSION = 5;
+  static constexpr int COMPAT_VERSION = 4;
+
+public:
+  std::map<inodeno_t, cap_reconnect_t> caps; // only head inodes
+  std::vector<snaprealm_reconnect_t> realms;
+  bool more = false;
+
+private:
+  MClientReconnect() :
+    SafeMessage{CEPH_MSG_CLIENT_RECONNECT, HEAD_VERSION, COMPAT_VERSION} {}
+  ~MClientReconnect() final {}
+
+  size_t cap_size = 0;
+  size_t realm_size = 0;
+  size_t approx_size = sizeof(__u32) + sizeof(__u32) + 1;
+
+  void calc_item_size() {
+    using ceph::encode;
+    {
+      ceph::buffer::list bl;
+      inodeno_t ino;
+      cap_reconnect_t cr;
+      encode(ino, bl);
+      encode(cr, bl);
+      cap_size = bl.length();
+    }
+    {
+      ceph::buffer::list bl;
+      snaprealm_reconnect_t sr;
+      encode(sr, bl);
+      realm_size = bl.length();
+    }
+  }
+
+public:
+  std::string_view get_type_name() const override { return "client_reconnect"; }
+  void print(std::ostream& out) const override {
+    out << "client_reconnect("
+	<< caps.size() << " caps " << realms.size() << " realms )";
+  }
+
+  // Force to use old encoding.
+  // Use connection's features to choose encoding if version is set to 0.
+  void set_encoding_version(int v) {
+    header.version = v;
+    if (v <= 3)
+      header.compat_version = 0;
+  }
+  size_t get_approx_size() {
+    return approx_size;
+  }
+  void mark_more() { more = true; }
+  bool has_more() const { return more; }
+
+  void add_cap(inodeno_t ino, uint64_t cap_id, inodeno_t pathbase, const std::string& path,
+	       int wanted, int issued, inodeno_t sr, snapid_t sf, ceph::buffer::list& lb)
+  {
+    caps[ino] = cap_reconnect_t(cap_id, pathbase, path, wanted, issued, sr, sf, lb);
+    if (!cap_size)
+      calc_item_size();
+    approx_size += cap_size + path.length() + lb.length();
+  }
+  void add_snaprealm(inodeno_t ino, snapid_t seq, inodeno_t parent) {
+    snaprealm_reconnect_t r;
+    r.realm.ino = ino;
+    r.realm.seq = seq;
+    r.realm.parent = parent;
+    realms.push_back(r);
+    if (!realm_size)
+      calc_item_size();
+    approx_size += realm_size;
+  }
+
+  void encode_payload(uint64_t features) override {
+    if (header.version == 0) {
+      if (features & CEPH_FEATURE_MDSENC)
+	header.version = 3;
+      else if (features & CEPH_FEATURE_FLOCK)
+	header.version = 2;
+      else
+	header.version = 1;
+    }
+
+    using ceph::encode;
+    data.clear();
+
+    if (header.version >= 4) {
+	encode(caps, data);
+	encode(realms, data);
+	encode(more, data);
+    } else {
+      // compat crap
+      if (header.version == 3) {
+	encode(caps, data);
+      } else if (header.version == 2) {
+	__u32 n = caps.size();
+	encode(n, data);
+	for (auto& p : caps) {
+	  encode(p.first, data);
+	  p.second.encode_old(data);
+	}
+      } else {
+	std::map<inodeno_t, old_cap_reconnect_t> ocaps;
+	for (auto& p : caps) {
+	  ocaps[p.first] = p.second;
+	encode(ocaps, data);
+      }
+      for (auto& r : realms)
+	r.encode_old(data);
+      }
+    }
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = data.cbegin();
+    if (header.version >= 4) {
+      decode(caps, p);
+      decode(realms, p);
+      if (header.version >= 5)
+	decode(more, p);
+    } else {
+      // compat crap
+      if (header.version == 3) {
+	decode(caps, p);
+      } else if (header.version == 2) {
+	__u32 n;
+	decode(n, p);
+	inodeno_t ino;
+	while (n--) {
+	  decode(ino, p);
+	  caps[ino].decode_old(p);
+	}
+      } else {
+	std::map<inodeno_t, old_cap_reconnect_t> ocaps;
+	decode(ocaps, p);
+	for (auto &q : ocaps)
+	  caps[q.first] = q.second;
+      }
+      while (!p.end()) {
+	realms.push_back(snaprealm_reconnect_t());
+	realms.back().decode_old(p);
+      }
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+
+#endif
diff --git a/src/messages/MClientReply.h b/src/messages/MClientReply.h
new file mode 100644
index 000000000..be33fad49
--- /dev/null
+++ b/src/messages/MClientReply.h
@@ -0,0 +1,425 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTREPLY_H
+#define CEPH_MCLIENTREPLY_H
+
+#include "include/types.h"
+#include "include/fs_types.h"
+#include "include/mempool.h"
+#include "MClientRequest.h"
+
+#include "msg/Message.h"
+#include "include/ceph_features.h"
+#include "common/errno.h"
+#include "common/strescape.h"
+
+/***
+ *
+ * MClientReply - container message for MDS reply to a client's MClientRequest
+ *
+ * key fields:
+ *  long tid - transaction id, so the client can match up with pending request
+ *  int result - error code, or fh if it was open
+ *
+ * for most requests:
+ *  trace is a vector of InodeStat's tracing from root to the file/dir/whatever
+ *  the operation referred to, so that the client can update it's info about what
+ *  metadata lives on what MDS.
+ *
+ * for readdir replies:
+ *  dir_contents is a vector of InodeStat*'s.  
+ * 
+ * that's mostly it, i think!
+ *
+ */
+
+
+struct LeaseStat {
+  // this matches ceph_mds_reply_lease
+  __u16 mask = 0;
+  __u32 duration_ms = 0;
+  __u32 seq = 0;
+  std::string alternate_name;
+
+  LeaseStat() = default;
+  LeaseStat(__u16 msk, __u32 dur, __u32 sq) : mask{msk}, duration_ms{dur}, seq{sq} {}
+
+  void decode(ceph::buffer::list::const_iterator &bl, const uint64_t features) {
+    using ceph::decode;
+    if (features == (uint64_t)-1) {
+      DECODE_START(2, bl);
+      decode(mask, bl);
+      decode(duration_ms, bl);
+      decode(seq, bl);
+      if (struct_v >= 2)
+        decode(alternate_name, bl);
+      DECODE_FINISH(bl);
+    }
+    else {
+      decode(mask, bl);
+      decode(duration_ms, bl);
+      decode(seq, bl);
+    }
+  }
+};
+
+inline std::ostream& operator<<(std::ostream& out, const LeaseStat& l) {
+  out << "lease(mask " << l.mask << " dur " << l.duration_ms;
+  if (l.alternate_name.size()) {
+    out << " altn " << binstrprint(l.alternate_name, 128) << ")";
+  }
+  return out << ")";
+}
+
+struct DirStat {
+  // mds distribution hints
+  frag_t frag;
+  __s32 auth;
+  std::set<__s32> dist;
+  
+  DirStat() : auth(CDIR_AUTH_PARENT) {}
+  DirStat(ceph::buffer::list::const_iterator& p, const uint64_t features) {
+    decode(p, features);
+  }
+
+  void decode(ceph::buffer::list::const_iterator& p, const uint64_t features) {
+    using ceph::decode;
+    if (features == (uint64_t)-1) {
+      DECODE_START(1, p);
+      decode(frag, p);
+      decode(auth, p);
+      decode(dist, p);
+      DECODE_FINISH(p);
+    }
+    else {
+      decode(frag, p);
+      decode(auth, p);
+      decode(dist, p);
+    }
+  }
+
+  // see CDir::encode_dirstat for encoder.
+};
+
+struct InodeStat {
+  vinodeno_t vino;
+  uint32_t rdev = 0;
+  version_t version = 0;
+  version_t xattr_version = 0;
+  ceph_mds_reply_cap cap;
+  file_layout_t layout;
+  utime_t ctime, btime, mtime, atime, snap_btime;
+  uint32_t time_warp_seq = 0;
+  uint64_t size = 0, max_size = 0;
+  uint64_t change_attr = 0;
+  uint64_t truncate_size = 0;
+  uint32_t truncate_seq = 0;
+  uint32_t mode = 0, uid = 0, gid = 0, nlink = 0;
+  frag_info_t dirstat;
+  nest_info_t rstat;
+
+  fragtree_t dirfragtree;
+  std::string  symlink;   // symlink content (if symlink)
+
+  ceph_dir_layout dir_layout;
+
+  ceph::buffer::list xattrbl;
+
+  ceph::buffer::list inline_data;
+  version_t inline_version;
+
+  quota_info_t quota;
+
+  mds_rank_t dir_pin;
+  std::map<std::string,std::string> snap_metadata;
+
+  std::vector<uint8_t> fscrypt_auth;
+  std::vector<uint8_t> fscrypt_file;
+
+ public:
+  InodeStat() {}
+  InodeStat(ceph::buffer::list::const_iterator& p, const uint64_t features) {
+    decode(p, features);
+  }
+
+  void decode(ceph::buffer::list::const_iterator &p, const uint64_t features) {
+    using ceph::decode;
+    if (features == (uint64_t)-1) {
+      DECODE_START(7, p);
+      decode(vino.ino, p);
+      decode(vino.snapid, p);
+      decode(rdev, p);
+      decode(version, p);
+      decode(xattr_version, p);
+      decode(cap, p);
+      {
+        ceph_file_layout legacy_layout;
+        decode(legacy_layout, p);
+        layout.from_legacy(legacy_layout);
+      }
+      decode(ctime, p);
+      decode(mtime, p);
+      decode(atime, p);
+      decode(time_warp_seq, p);
+      decode(size, p);
+      decode(max_size, p);
+      decode(truncate_size, p);
+      decode(truncate_seq, p);
+      decode(mode, p);
+      decode(uid, p);
+      decode(gid, p);
+      decode(nlink, p);
+      decode(dirstat.nfiles, p);
+      decode(dirstat.nsubdirs, p);
+      decode(rstat.rbytes, p);
+      decode(rstat.rfiles, p);
+      decode(rstat.rsubdirs, p);
+      decode(rstat.rctime, p);
+      decode(dirfragtree, p);
+      decode(symlink, p);
+      decode(dir_layout, p);
+      decode(xattrbl, p);
+      decode(inline_version, p);
+      decode(inline_data, p);
+      decode(quota, p);
+      decode(layout.pool_ns, p);
+      decode(btime, p);
+      decode(change_attr, p);
+      if (struct_v > 1) {
+        decode(dir_pin, p);
+      } else {
+        dir_pin = -ENODATA;
+      }
+      if (struct_v >= 3) {
+        decode(snap_btime, p);
+      } // else remains zero
+      if (struct_v >= 4) {
+        decode(rstat.rsnaps, p);
+      } // else remains zero
+      if (struct_v >= 5) {
+        decode(snap_metadata, p);
+      }
+      if (struct_v >= 6) {
+        bool fscrypt_flag;
+
+        decode(fscrypt_flag, p); // ignore this
+      }
+      if (struct_v >= 7) {
+        decode(fscrypt_auth, p);
+        decode(fscrypt_file, p);
+      }
+      DECODE_FINISH(p);
+    }
+    else {
+      decode(vino.ino, p);
+      decode(vino.snapid, p);
+      decode(rdev, p);
+      decode(version, p);
+      decode(xattr_version, p);
+      decode(cap, p);
+      {
+        ceph_file_layout legacy_layout;
+        decode(legacy_layout, p);
+        layout.from_legacy(legacy_layout);
+      }
+      decode(ctime, p);
+      decode(mtime, p);
+      decode(atime, p);
+      decode(time_warp_seq, p);
+      decode(size, p);
+      decode(max_size, p);
+      decode(truncate_size, p);
+      decode(truncate_seq, p);
+      decode(mode, p);
+      decode(uid, p);
+      decode(gid, p);
+      decode(nlink, p);
+      decode(dirstat.nfiles, p);
+      decode(dirstat.nsubdirs, p);
+      decode(rstat.rbytes, p);
+      decode(rstat.rfiles, p);
+      decode(rstat.rsubdirs, p);
+      decode(rstat.rctime, p);
+      decode(dirfragtree, p);
+      decode(symlink, p);
+      if (features & CEPH_FEATURE_DIRLAYOUTHASH)
+        decode(dir_layout, p);
+      else
+        memset(&dir_layout, 0, sizeof(dir_layout));
+
+      decode(xattrbl, p);
+
+      if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
+        decode(inline_version, p);
+        decode(inline_data, p);
+      } else {
+        inline_version = CEPH_INLINE_NONE;
+      }
+
+      if (features & CEPH_FEATURE_MDS_QUOTA)
+        decode(quota, p);
+      else
+        quota = quota_info_t{};
+
+      if ((features & CEPH_FEATURE_FS_FILE_LAYOUT_V2))
+        decode(layout.pool_ns, p);
+
+      if ((features & CEPH_FEATURE_FS_BTIME)) {
+        decode(btime, p);
+        decode(change_attr, p);
+      } else {
+        btime = utime_t();
+        change_attr = 0;
+      }
+    }
+  }
+  
+  // see CInode::encode_inodestat for encoder.
+};
+
+struct openc_response_t {
+  _inodeno_t			created_ino;
+  interval_set<inodeno_t>	delegated_inos;
+
+public:
+  void encode(ceph::buffer::list& bl) const {
+    using ceph::encode;
+    ENCODE_START(1, 1, bl);
+    encode(created_ino, bl);
+    encode(delegated_inos, bl);
+    ENCODE_FINISH(bl);
+  }
+  void decode(ceph::buffer::list::const_iterator &p) {
+    using ceph::decode;
+    DECODE_START(1, p);
+    decode(created_ino, p);
+    decode(delegated_inos, p);
+    DECODE_FINISH(p);
+  }
+} __attribute__ ((__may_alias__));
+WRITE_CLASS_ENCODER(openc_response_t)
+
+class MClientReply final : public MMDSOp {
+public:
+  // reply data
+  struct ceph_mds_reply_head head {};
+  ceph::buffer::list trace_bl;
+  ceph::buffer::list extra_bl;
+  ceph::buffer::list snapbl;
+
+  int get_op() const { return head.op; }
+
+  void set_mdsmap_epoch(epoch_t e) { head.mdsmap_epoch = e; }
+  epoch_t get_mdsmap_epoch() const { return head.mdsmap_epoch; }
+
+  int get_result() const {
+    #ifdef _WIN32
+    // libclient and libcephfs return CEPHFS_E* errors, which are basically
+    // Linux errno codes. If we convert mds errors to host errno values, we
+    // end up mixing error codes.
+    //
+    // For Windows, we'll preserve the original error value, which is expected
+    // to be a linux (CEPHFS_E*) error. It may be worth doing the same for
+    // other platforms.
+    return head.result;
+    #else
+    return ceph_to_hostos_errno((__s32)(__u32)head.result);
+    #endif
+  }
+
+  void set_result(int r) { head.result = r; }
+
+  void set_unsafe() { head.safe = 0; }
+
+  bool is_safe() const { return head.safe; }
+
+protected:
+  MClientReply() : MMDSOp{CEPH_MSG_CLIENT_REPLY} {}
+  MClientReply(const MClientRequest &req, int result = 0) :
+    MMDSOp{CEPH_MSG_CLIENT_REPLY} {
+    memset(&head, 0, sizeof(head));
+    header.tid = req.get_tid();
+    head.op = req.get_op();
+    head.result = result;
+    head.safe = 1;
+  }
+  ~MClientReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "creply"; }
+  void print(std::ostream& o) const override {
+    o << "client_reply(???:" << get_tid();
+    o << " = " << get_result();
+    if (get_result() <= 0) {
+      o << " " << cpp_strerror(get_result());
+    }
+    if (head.op & CEPH_MDS_OP_WRITE) {
+      if (head.safe)
+	o << " safe";
+      else
+	o << " unsafe";
+    }
+    o << ")";
+  }
+
+  // serialization
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(head, p);
+    decode(trace_bl, p);
+    decode(extra_bl, p);
+    decode(snapbl, p);
+    ceph_assert(p.end());
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(head, payload);
+    encode(trace_bl, payload);
+    encode(extra_bl, payload);
+    encode(snapbl, payload);
+  }
+
+
+  // dir contents
+  void set_extra_bl(ceph::buffer::list& bl) {
+    extra_bl = std::move(bl);
+  }
+  ceph::buffer::list& get_extra_bl() {
+    return extra_bl;
+  }
+  const ceph::buffer::list& get_extra_bl() const {
+    return extra_bl;
+  }
+
+  // trace
+  void set_trace(ceph::buffer::list& bl) {
+    trace_bl = std::move(bl);
+  }
+  ceph::buffer::list& get_trace_bl() {
+    return trace_bl;
+  }
+  const ceph::buffer::list& get_trace_bl() const {
+    return trace_bl;
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientRequest.h b/src/messages/MClientRequest.h
new file mode 100644
index 000000000..f63657d2e
--- /dev/null
+++ b/src/messages/MClientRequest.h
@@ -0,0 +1,375 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTREQUEST_H
+#define CEPH_MCLIENTREQUEST_H
+
+/**
+ *
+ * MClientRequest - container for a client METADATA request.  created/sent by clients.  
+ *    can be forwarded around between MDS's.
+ *
+ *   int client - the originating client
+ *   long tid   - transaction id, unique among requests for that client.  probably just a counter!
+ *                -> the MDS passes the Request to the Reply constructor, so this always matches.
+ *  
+ *   int op - the metadata op code.  MDS_OP_RENAME, etc.
+ *   int caller_uid, _gid - guess
+ * 
+ * fixed size arguments are in a union.
+ * there's also a string argument, for e.g. symlink().
+ *  
+ */
+
+#include <string_view>
+
+#include "include/filepath.h"
+#include "mds/mdstypes.h"
+#include "include/ceph_features.h"
+#include "mds/cephfs_features.h"
+#include "messages/MMDSOp.h"
+
+#include <sys/types.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+struct SnapPayload {
+  std::map<std::string, std::string> metadata;
+
+  void encode(ceph::buffer::list &bl) const {
+    ENCODE_START(1, 1, bl);
+    encode(metadata, bl);
+    ENCODE_FINISH(bl);
+  }
+
+  void decode(ceph::buffer::list::const_iterator &iter) {
+    DECODE_START(1, iter);
+    decode(metadata, iter);
+    DECODE_FINISH(iter);
+  }
+};
+
+WRITE_CLASS_ENCODER(SnapPayload)
+
+// metadata ops.
+
+class MClientRequest final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 6;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  mutable struct ceph_mds_request_head head; /* XXX HACK! */
+  utime_t stamp;
+  feature_bitset_t mds_features;
+
+  struct Release {
+    mutable ceph_mds_request_release item;
+    std::string dname;
+
+    Release() : item(), dname() {}
+    Release(const ceph_mds_request_release& rel, std::string name) :
+      item(rel), dname(name) {}
+
+    void encode(ceph::buffer::list& bl) const {
+      using ceph::encode;
+      item.dname_len = dname.length();
+      encode(item, bl);
+      ceph::encode_nohead(dname, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator& bl) {
+      using ceph::decode;
+      decode(item, bl);
+      ceph::decode_nohead(item.dname_len, dname, bl);
+    }
+  };
+  mutable std::vector<Release> releases; /* XXX HACK! */
+
+  // path arguments
+  filepath path, path2;
+  std::string alternate_name;
+  std::vector<uint64_t> gid_list;
+
+  std::vector<uint8_t> fscrypt_auth;
+  std::vector<uint8_t> fscrypt_file;
+
+  /* XXX HACK */
+  mutable bool queued_for_replay = false;
+
+protected:
+  // cons
+  MClientRequest()
+    : MMDSOp(CEPH_MSG_CLIENT_REQUEST, HEAD_VERSION, COMPAT_VERSION) {
+    memset(&head, 0, sizeof(head));
+    head.owner_uid = -1;
+    head.owner_gid = -1;
+  }
+  MClientRequest(int op, feature_bitset_t features = 0)
+    : MMDSOp(CEPH_MSG_CLIENT_REQUEST, HEAD_VERSION, COMPAT_VERSION) {
+    memset(&head, 0, sizeof(head));
+    head.op = op;
+    mds_features = features;
+    head.owner_uid = -1;
+    head.owner_gid = -1;
+  }
+  ~MClientRequest() final {}
+
+public:
+  void set_mdsmap_epoch(epoch_t e) { head.mdsmap_epoch = e; }
+  epoch_t get_mdsmap_epoch() const { return head.mdsmap_epoch; }
+  epoch_t get_osdmap_epoch() const {
+    ceph_assert(head.op == CEPH_MDS_OP_SETXATTR);
+    if (header.version >= 3)
+      return head.args.setxattr.osdmap_epoch;
+    else
+      return 0;
+  }
+  void set_osdmap_epoch(epoch_t e) {
+    ceph_assert(head.op == CEPH_MDS_OP_SETXATTR);
+    head.args.setxattr.osdmap_epoch = e;
+  }
+
+  metareqid_t get_reqid() const {
+    // FIXME: for now, assume clients always have 1 incarnation
+    return metareqid_t(get_orig_source(), header.tid); 
+  }
+
+  /*bool open_file_mode_is_readonly() {
+    return file_mode_is_readonly(ceph_flags_to_mode(head.args.open.flags));
+    }*/
+  bool may_write() const {
+    return
+      (head.op & CEPH_MDS_OP_WRITE) || 
+      (head.op == CEPH_MDS_OP_OPEN && (head.args.open.flags & (O_CREAT|O_TRUNC)));
+  }
+
+  int get_flags() const {
+    return head.flags;
+  }
+  bool is_replay() const {
+    return get_flags() & CEPH_MDS_FLAG_REPLAY;
+  }
+  bool is_async() const {
+    return get_flags() & CEPH_MDS_FLAG_ASYNC;
+  }
+
+  // normal fields
+  void set_stamp(utime_t t) { stamp = t; }
+  void set_oldest_client_tid(ceph_tid_t t) { head.oldest_client_tid = t; }
+  void inc_num_fwd() { head.ext_num_fwd = head.ext_num_fwd + 1; }
+  void set_retry_attempt(int a) { head.ext_num_retry = a; }
+  void set_filepath(const filepath& fp) { path = fp; }
+  void set_filepath2(const filepath& fp) { path2 = fp; }
+  void set_string2(const char *s) { path2.set_path(std::string_view(s), 0); }
+  void set_caller_uid(unsigned u) { head.caller_uid = u; }
+  void set_caller_gid(unsigned g) { head.caller_gid = g; }
+  void set_gid_list(int count, const gid_t *gids) {
+    gid_list.reserve(count);
+    for (int i = 0; i < count; ++i) {
+      gid_list.push_back(gids[i]);
+    }
+  }
+  void set_dentry_wanted() {
+    head.flags = head.flags | CEPH_MDS_FLAG_WANT_DENTRY;
+  }
+  void set_replayed_op() {
+    head.flags = head.flags | CEPH_MDS_FLAG_REPLAY;
+  }
+  void set_async_op() {
+    head.flags = head.flags | CEPH_MDS_FLAG_ASYNC;
+  }
+
+  void set_alternate_name(std::string _alternate_name) {
+    alternate_name = std::move(_alternate_name);
+  }
+  void set_alternate_name(bufferptr&& cipher) {
+    alternate_name = std::move(cipher.c_str());
+  }
+
+  utime_t get_stamp() const { return stamp; }
+  ceph_tid_t get_oldest_client_tid() const { return head.oldest_client_tid; }
+  int get_num_fwd() const { return head.ext_num_fwd; }
+  int get_retry_attempt() const { return head.ext_num_retry; }
+  int get_op() const { return head.op; }
+  unsigned get_caller_uid() const { return head.caller_uid; }
+  unsigned get_caller_gid() const { return head.caller_gid; }
+  unsigned get_owner_uid() const { return head.owner_uid; }
+  unsigned get_owner_gid() const { return head.owner_gid; }
+  const std::vector<uint64_t>& get_caller_gid_list() const { return gid_list; }
+
+  const std::string& get_path() const { return path.get_path(); }
+  const filepath& get_filepath() const { return path; }
+  const std::string& get_path2() const { return path2.get_path(); }
+  const filepath& get_filepath2() const { return path2; }
+  std::string_view get_alternate_name() const { return std::string_view(alternate_name); }
+
+  int get_dentry_wanted() const { return get_flags() & CEPH_MDS_FLAG_WANT_DENTRY; }
+
+  void mark_queued_for_replay() const { queued_for_replay = true; }
+  bool is_queued_for_replay() const { return queued_for_replay; }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+
+    if (header.version >= 4) {
+      decode(head, p);
+    } else {
+      struct ceph_mds_request_head_legacy old_mds_head;
+
+      decode(old_mds_head, p);
+      copy_from_legacy_head(&head, &old_mds_head);
+      head.version = 0;
+
+      head.ext_num_retry = head.num_retry;
+      head.ext_num_fwd = head.num_fwd;
+
+      head.owner_uid = head.caller_uid;
+      head.owner_gid = head.caller_gid;
+
+      /* Can't set the btime from legacy struct */
+      if (head.op == CEPH_MDS_OP_SETATTR) {
+	int localmask = head.args.setattr.mask;
+
+	localmask &= ~CEPH_SETATTR_BTIME;
+
+	head.args.setattr.btime = { ceph_le32(0), ceph_le32(0) };
+	head.args.setattr.mask = localmask;
+      }
+    }
+
+    decode(path, p);
+    decode(path2, p);
+    ceph::decode_nohead(head.num_releases, releases, p);
+    if (header.version >= 2)
+      decode(stamp, p);
+    if (header.version >= 4) // epoch 3 was for a ceph_mds_request_args change
+      decode(gid_list, p);
+    if (header.version >= 5)
+      decode(alternate_name, p);
+    if (header.version >= 6) {
+      decode(fscrypt_auth, p);
+      decode(fscrypt_file, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    head.num_releases = releases.size();
+    /*
+     * If the peer is old version, we must skip all the
+     * new members, because the old version of MDS or
+     * client will just copy the 'head' memory and isn't
+     * that smart to skip them.
+     */
+    if (!mds_features.test(CEPHFS_FEATURE_32BITS_RETRY_FWD)) {
+      head.version = 1;
+    } else if (!mds_features.test(CEPHFS_FEATURE_HAS_OWNER_UIDGID)) {
+      head.version = 2;
+    } else {
+      head.version = CEPH_MDS_REQUEST_HEAD_VERSION;
+    }
+
+    if (features & CEPH_FEATURE_FS_BTIME) {
+      encode(head, payload);
+    } else {
+      struct ceph_mds_request_head_legacy old_mds_head;
+
+      copy_to_legacy_head(&old_mds_head, &head);
+      encode(old_mds_head, payload);
+    }
+
+    encode(path, payload);
+    encode(path2, payload);
+    ceph::encode_nohead(releases, payload);
+    encode(stamp, payload);
+    encode(gid_list, payload);
+    encode(alternate_name, payload);
+    encode(fscrypt_auth, payload);
+    encode(fscrypt_file, payload);
+  }
+
+  std::string_view get_type_name() const override { return "creq"; }
+  void print(std::ostream& out) const override {
+    out << "client_request(" << get_orig_source()
+	<< ":" << get_tid()
+	<< " " << ceph_mds_op_name(get_op());
+    if (IS_CEPH_MDS_OP_NEWINODE(head.op)) {
+      out << " owner_uid=" << head.owner_uid
+	  << ", owner_gid=" << head.owner_gid;
+    }
+    if (head.op == CEPH_MDS_OP_GETATTR)
+      out << " " << ccap_string(head.args.getattr.mask);
+    if (head.op == CEPH_MDS_OP_SETATTR) {
+      if (head.args.setattr.mask & CEPH_SETATTR_MODE)
+	out << " mode=0" << std::oct << head.args.setattr.mode << std::dec;
+      if (head.args.setattr.mask & CEPH_SETATTR_UID)
+	out << " uid=" << head.args.setattr.uid;
+      if (head.args.setattr.mask & CEPH_SETATTR_GID)
+	out << " gid=" << head.args.setattr.gid;
+      if (head.args.setattr.mask & CEPH_SETATTR_SIZE)
+	out << " size=" << head.args.setattr.size;
+      if (head.args.setattr.mask & CEPH_SETATTR_MTIME)
+	out << " mtime=" << utime_t(head.args.setattr.mtime);
+      if (head.args.setattr.mask & CEPH_SETATTR_ATIME)
+	out << " atime=" << utime_t(head.args.setattr.atime);
+    }
+    if (head.op == CEPH_MDS_OP_SETFILELOCK ||
+	head.op == CEPH_MDS_OP_GETFILELOCK) {
+      out << " rule " << (int)head.args.filelock_change.rule
+	  << ", type " << (int)head.args.filelock_change.type
+	  << ", owner " << head.args.filelock_change.owner
+	  << ", pid " << head.args.filelock_change.pid
+	  << ", start " << head.args.filelock_change.start
+	  << ", length " << head.args.filelock_change.length
+	  << ", wait " << (int)head.args.filelock_change.wait;
+    }
+    //if (!get_filepath().empty()) 
+    out << " " << get_filepath();
+    if (alternate_name.size())
+      out << " (" << alternate_name << ") ";
+    if (!get_filepath2().empty())
+      out << " " << get_filepath2();
+    if (stamp != utime_t())
+      out << " " << stamp;
+    if (head.ext_num_fwd)
+      out << " FWD=" << (int)head.ext_num_fwd;
+    if (head.ext_num_retry)
+      out << " RETRY=" << (int)head.ext_num_retry;
+    if (is_async())
+      out << " ASYNC";
+    if (is_replay())
+      out << " REPLAY";
+    if (queued_for_replay)
+      out << " QUEUED_FOR_REPLAY";
+    out << " caller_uid=" << head.caller_uid
+	<< ", caller_gid=" << head.caller_gid
+	<< '{';
+    for (auto i = gid_list.begin(); i != gid_list.end(); ++i)
+      out << *i << ',';
+    out << '}'
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+WRITE_CLASS_ENCODER(MClientRequest::Release)
+
+#endif
diff --git a/src/messages/MClientRequestForward.h b/src/messages/MClientRequestForward.h
new file mode 100644
index 000000000..a9c2b04dc
--- /dev/null
+++ b/src/messages/MClientRequestForward.h
@@ -0,0 +1,74 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MCLIENTREQUESTFORWARD_H
+#define CEPH_MCLIENTREQUESTFORWARD_H
+
+#include "msg/Message.h"
+
+class MClientRequestForward final : public SafeMessage {
+private:
+  int32_t dest_mds;
+  int32_t num_fwd;
+  bool client_must_resend;
+
+protected:
+  MClientRequestForward()
+    : SafeMessage{CEPH_MSG_CLIENT_REQUEST_FORWARD},
+      dest_mds(-1), num_fwd(-1), client_must_resend(false) {}
+  MClientRequestForward(ceph_tid_t t, int dm, int nf, bool cmr) :
+    SafeMessage{CEPH_MSG_CLIENT_REQUEST_FORWARD},
+    dest_mds(dm), num_fwd(nf), client_must_resend(cmr) {
+    ceph_assert(client_must_resend);
+    header.tid = t;
+  }
+  ~MClientRequestForward() final {}
+
+public:
+  int get_dest_mds() const { return dest_mds; }
+  int get_num_fwd() const { return num_fwd; }
+  bool must_resend() const { return client_must_resend; }
+
+  std::string_view get_type_name() const override { return "client_request_forward"; }
+  void print(std::ostream& o) const override {
+    o << "client_request_forward(" << get_tid()
+      << " to mds." << dest_mds
+      << " num_fwd=" << num_fwd
+      << (client_must_resend ? " client_must_resend":"")
+      << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dest_mds, payload);
+    encode(num_fwd, payload);
+    encode(client_must_resend, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dest_mds, p);
+    decode(num_fwd, p);
+    decode(client_must_resend, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientSession.h b/src/messages/MClientSession.h
new file mode 100644
index 000000000..7ce165870
--- /dev/null
+++ b/src/messages/MClientSession.h
@@ -0,0 +1,108 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCLIENTSESSION_H
+#define CEPH_MCLIENTSESSION_H
+
+#include "msg/Message.h"
+#include "mds/mdstypes.h"
+
+class MClientSession final : public SafeMessage {
+private:
+  static constexpr int HEAD_VERSION = 5;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  ceph_mds_session_head head;
+  static constexpr unsigned SESSION_BLOCKLISTED = (1<<0);
+
+  unsigned flags = 0;
+  std::map<std::string, std::string> metadata;
+  feature_bitset_t supported_features;
+  metric_spec_t metric_spec;
+
+  int get_op() const { return head.op; }
+  version_t get_seq() const { return head.seq; }
+  utime_t get_stamp() const { return utime_t(head.stamp); }
+  int get_max_caps() const { return head.max_caps; }
+  int get_max_leases() const { return head.max_leases; }
+
+protected:
+  MClientSession() : SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION} { }
+  MClientSession(int o, version_t s=0, unsigned msg_flags=0) :
+    SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION},
+    flags(msg_flags) {
+    memset(&head, 0, sizeof(head));
+    head.op = o;
+    head.seq = s;
+  }
+  MClientSession(int o, utime_t st) : 
+    SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION} {
+    memset(&head, 0, sizeof(head));
+    head.op = o;
+    head.seq = 0;
+    st.encode_timeval(&head.stamp);
+  }
+  ~MClientSession() final {}
+
+public:
+  std::string_view get_type_name() const override { return "client_session"; }
+  void print(std::ostream& out) const override {
+    out << "client_session(" << ceph_session_op_name(get_op());
+    if (get_seq())
+      out << " seq " << get_seq();
+    if (get_op() == CEPH_SESSION_RECALL_STATE)
+      out << " max_caps " << head.max_caps << " max_leases " << head.max_leases;
+    out << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(head, p);
+    if (header.version >= 2)
+      decode(metadata, p);
+    if (header.version >= 3)
+      decode(supported_features, p);
+    if (header.version >= 4) {
+      decode(metric_spec, p);
+    }
+    if (header.version >= 5) {
+      decode(flags, p);
+    }
+  }
+  void encode_payload(uint64_t features) override { 
+    using ceph::encode;
+    encode(head, payload);
+    if (metadata.empty() && supported_features.empty()) {
+      // If we're not trying to send any metadata (always the case if
+      // we are a server) then send older-format message to avoid upsetting
+      // old kernel clients.
+      header.version = 1;
+    } else {
+      header.version = HEAD_VERSION;
+      encode(metadata, payload);
+      encode(supported_features, payload);
+      encode(metric_spec, payload);
+      encode(flags, payload);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MClientSnap.h b/src/messages/MClientSnap.h
new file mode 100644
index 000000000..d2d0633ad
--- /dev/null
+++ b/src/messages/MClientSnap.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCLIENTSNAP_H
+#define CEPH_MCLIENTSNAP_H
+
+#include "msg/Message.h"
+
+class MClientSnap final : public SafeMessage {
+public:
+  ceph_mds_snap_head head;
+  ceph::buffer::list bl;
+  
+  // (for split only)
+  std::vector<inodeno_t> split_inos;
+  std::vector<inodeno_t> split_realms;
+
+protected:
+  MClientSnap(int o=0) : 
+    SafeMessage{CEPH_MSG_CLIENT_SNAP} {
+    memset(&head, 0, sizeof(head));
+    head.op = o;
+  }
+  ~MClientSnap() final {}
+
+public:  
+  std::string_view get_type_name() const override { return "client_snap"; }
+  void print(std::ostream& out) const override {
+    out << "client_snap(" << ceph_snap_op_name(head.op);
+    if (head.split)
+      out << " split=" << inodeno_t(head.split);
+    out << " tracelen=" << bl.length();
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    head.num_split_inos = split_inos.size();
+    head.num_split_realms = split_realms.size();
+    head.trace_len = bl.length();
+    encode(head, payload);
+    ceph::encode_nohead(split_inos, payload);
+    ceph::encode_nohead(split_realms, payload);
+    ceph::encode_nohead(bl, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(head, p);
+    ceph::decode_nohead(head.num_split_inos, split_inos, p);
+    ceph::decode_nohead(head.num_split_realms, split_realms, p);
+    ceph::decode_nohead(head.trace_len, bl, p);
+    ceph_assert(p.end());
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MCommand.h b/src/messages/MCommand.h
new file mode 100644
index 000000000..cd912cd28
--- /dev/null
+++ b/src/messages/MCommand.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCOMMAND_H
+#define CEPH_MCOMMAND_H
+
+#include <vector>
+
+#include "msg/Message.h"
+
+class MCommand final : public Message {
+public:
+  uuid_d fsid;
+  std::vector<std::string> cmd;
+
+  MCommand()
+    : Message{MSG_COMMAND} {}
+  MCommand(const uuid_d &f)
+    : Message{MSG_COMMAND},
+      fsid(f) { }
+
+private:
+  ~MCommand() final {}
+
+public:
+  std::string_view get_type_name() const override { return "command"; }
+  void print(std::ostream& o) const override {
+    o << "command(tid " << get_tid() << ": ";
+    for (unsigned i=0; i<cmd.size(); i++) {
+      if (i) o << ' ';
+      o << cmd[i];
+    }
+    o << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(cmd, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(cmd, p);
+  }
+};
+
+#endif
diff --git a/src/messages/MCommandReply.h b/src/messages/MCommandReply.h
new file mode 100644
index 000000000..ed627c85c
--- /dev/null
+++ b/src/messages/MCommandReply.h
@@ -0,0 +1,59 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MCOMMANDREPLY_H
+#define CEPH_MCOMMANDREPLY_H
+
+#include <string_view>
+
+#include "msg/Message.h"
+#include "MCommand.h"
+
+class MCommandReply final : public Message {
+public:
+  errorcode32_t r;
+  std::string rs;
+  
+  MCommandReply()
+    : Message{MSG_COMMAND_REPLY} {}
+  MCommandReply(MCommand *m, int _r)
+    : Message{MSG_COMMAND_REPLY}, r(_r) {
+    header.tid = m->get_tid();
+  }
+  MCommandReply(int _r, std::string_view s)
+    : Message{MSG_COMMAND_REPLY},
+      r(_r), rs(s) { }
+private:
+  ~MCommandReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "command_reply"; }
+  void print(std::ostream& o) const override {
+    o << "command_reply(tid " << get_tid() << ": " << r << " " << rs << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(r, payload);
+    encode(rs, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(r, p);
+    decode(rs, p);
+  }
+};
+
+#endif
diff --git a/src/messages/MConfig.h b/src/messages/MConfig.h
new file mode 100644
index 000000000..c97c70640
--- /dev/null
+++ b/src/messages/MConfig.h
@@ -0,0 +1,42 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+
+class MConfig : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  // use transparent comparator so we can lookup in it by std::string_view keys
+  std::map<std::string,std::string,std::less<>> config;
+
+  MConfig() : Message{MSG_CONFIG, HEAD_VERSION, COMPAT_VERSION} { }
+  MConfig(const std::map<std::string,std::string,std::less<>>& c)
+    : Message{MSG_CONFIG, HEAD_VERSION, COMPAT_VERSION},
+      config{c} {}
+  MConfig(std::map<std::string,std::string,std::less<>>&& c)
+    : Message{MSG_CONFIG, HEAD_VERSION, COMPAT_VERSION},
+      config{std::move(c)} {}
+
+  std::string_view get_type_name() const override {
+    return "config";
+  }
+  void print(std::ostream& o) const override {
+    o << "config(" << config.size() << " keys" << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(config, p);
+  }
+
+  void encode_payload(uint64_t) override {
+    using ceph::encode;
+    encode(config, payload);
+  }
+
+};
diff --git a/src/messages/MDentryLink.h b/src/messages/MDentryLink.h
new file mode 100644
index 000000000..f96dccf96
--- /dev/null
+++ b/src/messages/MDentryLink.h
@@ -0,0 +1,82 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MDENTRYLINK_H
+#define CEPH_MDENTRYLINK_H
+
+#include <string_view>
+
+#include "messages/MMDSOp.h"
+
+class MDentryLink final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  
+  dirfrag_t subtree;
+  dirfrag_t dirfrag;
+  std::string dn;
+  bool is_primary = false;
+
+ public:
+  dirfrag_t get_subtree() const { return subtree; }
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  const std::string& get_dn() const { return dn; }
+  bool get_is_primary() const { return is_primary; }
+
+  ceph::buffer::list bl;
+
+protected:
+  MDentryLink() :
+    MMDSOp(MSG_MDS_DENTRYLINK, HEAD_VERSION, COMPAT_VERSION) { }
+  MDentryLink(dirfrag_t r, dirfrag_t df, std::string_view n, bool p) :
+    MMDSOp(MSG_MDS_DENTRYLINK, HEAD_VERSION, COMPAT_VERSION),
+    subtree(r),
+    dirfrag(df),
+    dn(n),
+    is_primary(p) {}
+  ~MDentryLink() final {}
+
+public:
+  std::string_view get_type_name() const override { return "dentry_link";}
+  void print(std::ostream& o) const override {
+    o << "dentry_link(" << dirfrag << " " << dn << ")";
+  }
+  
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(subtree, p);
+    decode(dirfrag, p);
+    decode(dn, p);
+    decode(is_primary, p);
+    decode(bl, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(subtree, payload);
+    encode(dirfrag, payload);
+    encode(dn, payload);
+    encode(is_primary, payload);
+    encode(bl, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MDentryUnlink.h b/src/messages/MDentryUnlink.h
new file mode 100644
index 000000000..210fa033c
--- /dev/null
+++ b/src/messages/MDentryUnlink.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MDENTRYUNLINK_H
+#define CEPH_MDENTRYUNLINK_H
+
+#include <string_view>
+
+#include "messages/MMDSOp.h"
+
+class MDentryUnlink final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  
+  dirfrag_t dirfrag;
+  std::string dn;
+
+ public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  const std::string& get_dn() const { return dn; }
+
+  ceph::buffer::list straybl;
+  ceph::buffer::list snapbl;
+
+protected:
+  MDentryUnlink() :
+    MMDSOp(MSG_MDS_DENTRYUNLINK, HEAD_VERSION, COMPAT_VERSION) { }
+  MDentryUnlink(dirfrag_t df, std::string_view n) :
+    MMDSOp(MSG_MDS_DENTRYUNLINK, HEAD_VERSION, COMPAT_VERSION),
+    dirfrag(df),
+    dn(n) {}
+  ~MDentryUnlink() final {}
+
+public:
+  std::string_view get_type_name() const override { return "dentry_unlink";}
+  void print(std::ostream& o) const override {
+    o << "dentry_unlink(" << dirfrag << " " << dn << ")";
+  }
+  
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(dn, p);
+    decode(straybl, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(dn, payload);
+    encode(straybl, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MDirUpdate.h b/src/messages/MDirUpdate.h
new file mode 100644
index 000000000..67b4e1f3b
--- /dev/null
+++ b/src/messages/MDirUpdate.h
@@ -0,0 +1,100 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MDIRUPDATE_H
+#define CEPH_MDIRUPDATE_H
+
+#include "messages/MMDSOp.h"
+
+class MDirUpdate final : public MMDSOp {
+public:
+  mds_rank_t get_source_mds() const { return from_mds; }
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  int get_dir_rep() const { return dir_rep; }
+  const std::set<int32_t>& get_dir_rep_by() const { return dir_rep_by; }
+  bool should_discover() const { return discover > tried_discover; }
+  const filepath& get_path() const { return path; }
+
+  bool has_tried_discover() const { return tried_discover > 0; }
+  void inc_tried_discover() const { ++tried_discover; }
+
+  std::string_view get_type_name() const override { return "dir_update"; }
+  void print(std::ostream& out) const override {
+    out << "dir_update(" << get_dirfrag() << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(from_mds, p);
+    decode(dirfrag, p);
+    decode(dir_rep, p);
+    decode(discover, p);
+    decode(dir_rep_by, p);
+    decode(path, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(from_mds, payload);
+    encode(dirfrag, payload);
+    encode(dir_rep, payload);
+    encode(discover, payload);
+    encode(dir_rep_by, payload);
+    encode(path, payload);
+  }
+
+protected:
+  ~MDirUpdate() final {}
+  MDirUpdate() : MMDSOp(MSG_MDS_DIRUPDATE, HEAD_VERSION, COMPAT_VERSION) {}
+  MDirUpdate(mds_rank_t f,
+	     dirfrag_t dirfrag,
+             int dir_rep,
+             const std::set<int32_t>& dir_rep_by,
+             filepath& path,
+             bool discover = false) :
+    MMDSOp(MSG_MDS_DIRUPDATE, HEAD_VERSION, COMPAT_VERSION), from_mds(f), dirfrag(dirfrag),
+    dir_rep(dir_rep), dir_rep_by(dir_rep_by), path(path) {
+    this->discover = discover ? 5 : 0;
+  }
+  MDirUpdate(const MDirUpdate& m)
+  : MMDSOp{MSG_MDS_DIRUPDATE},
+    from_mds(m.from_mds),
+    dirfrag(m.dirfrag),
+    dir_rep(m.dir_rep),
+    discover(m.discover),
+    dir_rep_by(m.dir_rep_by),
+    path(m.path),
+    tried_discover(m.tried_discover)
+  {}
+
+  mds_rank_t from_mds = -1;
+  dirfrag_t dirfrag;
+  int32_t dir_rep = 5;
+  int32_t discover = 5;
+  std::set<int32_t> dir_rep_by;
+  filepath path;
+  mutable int tried_discover = 0; // XXX HACK
+
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MDiscover.h b/src/messages/MDiscover.h
new file mode 100644
index 000000000..5a69fa7fa
--- /dev/null
+++ b/src/messages/MDiscover.h
@@ -0,0 +1,102 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MDISCOVER_H
+#define CEPH_MDISCOVER_H
+
+#include "include/filepath.h"
+#include "messages/MMDSOp.h"
+
+#include <string>
+
+
+class MDiscover final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  inodeno_t       base_ino;          // 1 -> root
+  frag_t          base_dir_frag;
+
+  snapid_t        snapid;
+  filepath        want;   // ... [/]need/this/stuff
+
+  bool want_base_dir = true;
+  bool path_locked = false;
+
+ public:
+  inodeno_t get_base_ino() const { return base_ino; }
+  frag_t    get_base_dir_frag() const { return base_dir_frag; }
+  snapid_t  get_snapid() const { return snapid; }
+
+  const filepath& get_want() const { return want; }
+  const std::string& get_dentry(int n) const { return want[n]; }
+
+  bool wants_base_dir() const { return want_base_dir; }
+  bool is_path_locked() const { return path_locked; }
+  
+  void set_base_dir_frag(frag_t f) { base_dir_frag = f; }
+
+protected:
+  MDiscover() : MMDSOp(MSG_MDS_DISCOVER, HEAD_VERSION, COMPAT_VERSION) { }
+  MDiscover(inodeno_t base_ino_,
+	    frag_t base_frag_,
+	    snapid_t s,
+            filepath& want_path_,
+            bool want_base_dir_ = true,
+	    bool path_locked_ = false) :
+    MMDSOp{MSG_MDS_DISCOVER},
+    base_ino(base_ino_),
+    base_dir_frag(base_frag_),
+    snapid(s),
+    want(want_path_),
+    want_base_dir(want_base_dir_),
+    path_locked(path_locked_) { }
+  ~MDiscover() final {}
+
+public:
+  std::string_view get_type_name() const override { return "Dis"; }
+  void print(std::ostream &out) const override {
+    out << "discover(" << header.tid << " " << base_ino << "." << base_dir_frag
+	<< " " << want << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base_ino, p);
+    decode(base_dir_frag, p);
+    decode(snapid, p);
+    decode(want, p);
+    decode(want_base_dir, p);
+    decode(path_locked, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base_ino, payload);
+    encode(base_dir_frag, payload);
+    encode(snapid, payload);
+    encode(want, payload);
+    encode(want_base_dir, payload);
+    encode(path_locked, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MDiscoverReply.h b/src/messages/MDiscoverReply.h
new file mode 100644
index 000000000..e8a553f1d
--- /dev/null
+++ b/src/messages/MDiscoverReply.h
@@ -0,0 +1,217 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MDISCOVERREPLY_H
+#define CEPH_MDISCOVERREPLY_H
+
+#include "include/filepath.h"
+#include "messages/MMDSOp.h"
+
+#include <string>
+
+
+
+/**
+ * MDiscoverReply - return new replicas (of inodes, dirs, dentries)
+ *
+ * we group returned items by (dir, dentry, inode).  each
+ * item in each set shares an index (it's "depth").
+ *
+ * we can start and end with any type.
+ *   no_base_dir    = true if the first group has an inode but no dir
+ *   no_base_dentry = true if the first group has an inode but no dentry
+ * they are false if there is no returned data, ie the first group is empty.
+ *
+ * we also return errors:
+ *   error_flag_dn(std::string) - the specified dentry dne
+ *   error_flag_dir        - the last item wasn't a dir, so we couldn't continue.
+ *
+ * and sometimes,
+ *   dir_auth_hint         - where we think the dir auth is
+ *
+ * depth() gives us the number of depth units/indices for which we have 
+ * information.  this INCLUDES those for which we have errors but no data.
+ *
+ * see MDCache::handle_discover, handle_discover_reply.
+ *
+ *
+ * so basically, we get
+ *
+ *   dir den ino   i
+ *            x    0
+ *    x   x   x    1
+ * or
+ *        x   x    0
+ *    x   x   x    1
+ * or
+ *    x   x   x    0
+ *    x   x   x    1
+ * ...and trail off however we want.    
+ * 
+ * 
+ */
+
+class MDiscoverReply final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+  // info about original request
+  inodeno_t base_ino;
+  frag_t base_dir_frag;  
+  bool wanted_base_dir = false;
+  bool path_locked = false;
+  snapid_t wanted_snapid;
+
+  // and the response
+  bool flag_error_dn = false;
+  bool flag_error_dir = false;
+  std::string error_dentry;   // dentry that was not found (to trigger waiters on asker)
+  bool unsolicited = false;
+
+  mds_rank_t dir_auth_hint = 0;
+
+ public:
+  __u8 starts_with = 0;
+  ceph::buffer::list trace;
+
+  enum { DIR, DENTRY, INODE };
+
+  // accessors
+  inodeno_t get_base_ino() const { return base_ino; }
+  frag_t get_base_dir_frag() const { return base_dir_frag; }
+  bool get_wanted_base_dir() const { return wanted_base_dir; }
+  bool is_path_locked() const { return path_locked; }
+  snapid_t get_wanted_snapid() const { return wanted_snapid; }
+
+  bool is_flag_error_dn() const { return flag_error_dn; }
+  bool is_flag_error_dir() const { return flag_error_dir; }
+  const std::string& get_error_dentry() const { return error_dentry; }
+
+  int get_starts_with() const { return starts_with; }
+
+  mds_rank_t get_dir_auth_hint() const { return dir_auth_hint; }
+
+  bool is_unsolicited() const { return unsolicited; }
+  void mark_unsolicited() { unsolicited = true; }
+
+  void set_base_dir_frag(frag_t df) { base_dir_frag = df; }
+
+protected:
+  MDiscoverReply() : MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION} { }
+  MDiscoverReply(const MDiscover &dis) :
+    MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION},
+    base_ino(dis.get_base_ino()),
+    base_dir_frag(dis.get_base_dir_frag()),
+    wanted_base_dir(dis.wants_base_dir()),
+    path_locked(dis.is_path_locked()),
+    wanted_snapid(dis.get_snapid()),
+    flag_error_dn(false),
+    flag_error_dir(false),
+    unsolicited(false),
+    dir_auth_hint(CDIR_AUTH_UNKNOWN),
+    starts_with(DIR)
+  {
+    header.tid = dis.get_tid();
+  }
+  MDiscoverReply(dirfrag_t df) :
+    MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION},
+    base_ino(df.ino),
+    base_dir_frag(df.frag),
+    wanted_base_dir(false),
+    path_locked(false),
+    wanted_snapid(CEPH_NOSNAP),
+    flag_error_dn(false),
+    flag_error_dir(false),
+    unsolicited(false),
+    dir_auth_hint(CDIR_AUTH_UNKNOWN),
+    starts_with(DIR)
+  {
+    header.tid = 0;
+  }
+  ~MDiscoverReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "discover_reply"; }
+  void print(std::ostream& out) const override {
+    out << "discover_reply(" << header.tid << " " << base_ino << ")";
+  }
+
+  // builders
+  bool is_empty() const {
+    return trace.length() == 0 &&
+      !flag_error_dn &&
+      !flag_error_dir &&
+      dir_auth_hint == CDIR_AUTH_UNKNOWN;
+  }
+
+  //  void set_flag_forward() { flag_forward = true; }
+  void set_flag_error_dn(std::string_view dn) { 
+    flag_error_dn = true;
+    error_dentry = dn;
+  }
+  void set_flag_error_dir() {
+    flag_error_dir = true;
+  }
+  void set_dir_auth_hint(int a) {
+    dir_auth_hint = a;
+  }
+  void set_error_dentry(std::string_view dn) {
+    error_dentry = dn;
+  }
+
+
+  // ...
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base_ino, p);
+    decode(base_dir_frag, p);
+    decode(wanted_base_dir, p);
+    decode(path_locked, p);
+    decode(wanted_snapid, p);
+    decode(flag_error_dn, p);
+    decode(flag_error_dir, p);
+    decode(error_dentry, p);
+    decode(dir_auth_hint, p);
+    decode(unsolicited, p);
+
+    decode(starts_with, p);
+    decode(trace, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base_ino, payload);
+    encode(base_dir_frag, payload);
+    encode(wanted_base_dir, payload);
+    encode(path_locked, payload);
+    encode(wanted_snapid, payload);
+    encode(flag_error_dn, payload);
+    encode(flag_error_dir, payload);
+    encode(error_dentry, payload);
+    encode(dir_auth_hint, payload);
+    encode(unsolicited, payload);
+
+    encode(starts_with, payload);
+    encode(trace, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportCaps.h b/src/messages/MExportCaps.h
new file mode 100644
index 000000000..86c795403
--- /dev/null
+++ b/src/messages/MExportCaps.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MEXPORTCAPS_H
+#define CEPH_MEXPORTCAPS_H
+
+#include "messages/MMDSOp.h"
+
+class MExportCaps final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:  
+  inodeno_t ino;
+  ceph::buffer::list cap_bl;
+  std::map<client_t,entity_inst_t> client_map;
+  std::map<client_t,client_metadata_t> client_metadata_map;
+
+protected:
+  MExportCaps() :
+    MMDSOp{MSG_MDS_EXPORTCAPS, HEAD_VERSION, COMPAT_VERSION} {}
+  ~MExportCaps() final {}
+
+public:
+  std::string_view get_type_name() const override { return "export_caps"; }
+  void print(std::ostream& o) const override {
+    o << "export_caps(" << ino << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(cap_bl, payload);
+    encode(client_map, payload, features);
+    encode(client_metadata_map, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(cap_bl, p);
+    decode(client_map, p);
+    if (header.version >= 2)
+      decode(client_metadata_map, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportCapsAck.h b/src/messages/MExportCapsAck.h
new file mode 100644
index 000000000..d57588192
--- /dev/null
+++ b/src/messages/MExportCapsAck.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MEXPORTCAPSACK_H
+#define CEPH_MEXPORTCAPSACK_H
+
+#include "messages/MMDSOp.h"
+
+class MExportCapsAck final : public MMDSOp {
+ static constexpr int HEAD_VERSION = 1;
+ static constexpr int COMPAT_VERSION = 1;
+
+public:  
+  inodeno_t ino;
+  ceph::buffer::list cap_bl;
+
+protected:
+  MExportCapsAck() :
+    MMDSOp{MSG_MDS_EXPORTCAPSACK, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportCapsAck(inodeno_t i) :
+    MMDSOp{MSG_MDS_EXPORTCAPSACK, HEAD_VERSION, COMPAT_VERSION}, ino(i) {}
+  ~MExportCapsAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "export_caps_ack"; }
+  void print(std::ostream& o) const override {
+    o << "export_caps_ack(" << ino << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(cap_bl, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(cap_bl, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDir.h b/src/messages/MExportDir.h
new file mode 100644
index 000000000..7c2b39166
--- /dev/null
+++ b/src/messages/MExportDir.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MEXPORTDIR_H
+#define CEPH_MEXPORTDIR_H
+
+#include "messages/MMDSOp.h"
+
+class MExportDir final : public MMDSOp {
+public:
+  dirfrag_t dirfrag;
+  ceph::buffer::list export_data;
+  std::vector<dirfrag_t> bounds;
+  ceph::buffer::list client_map;
+
+protected:
+  MExportDir() : MMDSOp{MSG_MDS_EXPORTDIR} {}
+  MExportDir(dirfrag_t df, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIR}, dirfrag(df) {
+    set_tid(tid);
+  }
+  ~MExportDir() final {}
+
+public:
+  std::string_view get_type_name() const override { return "Ex"; }
+  void print(std::ostream& o) const override {
+    o << "export(" << dirfrag << ")";
+  }
+
+  void add_export(dirfrag_t df) { 
+    bounds.push_back(df); 
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(bounds, payload);
+    encode(export_data, payload);
+    encode(client_map, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(bounds, p);
+    decode(export_data, p);
+    decode(client_map, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirAck.h b/src/messages/MExportDirAck.h
new file mode 100644
index 000000000..76b872df4
--- /dev/null
+++ b/src/messages/MExportDirAck.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRACK_H
+#define CEPH_MEXPORTDIRACK_H
+
+#include "MExportDir.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirAck final : public MMDSOp {
+public:
+  dirfrag_t dirfrag;
+  ceph::buffer::list imported_caps;
+
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  
+protected:
+  MExportDirAck() : MMDSOp{MSG_MDS_EXPORTDIRACK} {}
+  MExportDirAck(dirfrag_t df, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRACK}, dirfrag(df) {
+    set_tid(tid);
+  }
+  ~MExportDirAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExAck"; }
+  void print(std::ostream& o) const override {
+    o << "export_ack(" << dirfrag << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(imported_caps, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(imported_caps, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirCancel.h b/src/messages/MExportDirCancel.h
new file mode 100644
index 000000000..b085231e7
--- /dev/null
+++ b/src/messages/MExportDirCancel.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRCANCEL_H
+#define CEPH_MEXPORTDIRCANCEL_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirCancel final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  dirfrag_t dirfrag;
+
+ public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+
+protected:
+  MExportDirCancel() : MMDSOp{MSG_MDS_EXPORTDIRCANCEL, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportDirCancel(dirfrag_t df, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRCANCEL, HEAD_VERSION, COMPAT_VERSION}, dirfrag(df) {
+    set_tid(tid);
+  }
+  ~MExportDirCancel() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExCancel"; }
+  void print(std::ostream& o) const override {
+    o << "export_cancel(" << dirfrag << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirDiscover.h b/src/messages/MExportDirDiscover.h
new file mode 100644
index 000000000..c191e1011
--- /dev/null
+++ b/src/messages/MExportDirDiscover.h
@@ -0,0 +1,75 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRDISCOVER_H
+#define CEPH_MEXPORTDIRDISCOVER_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirDiscover final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  mds_rank_t from = -1;
+  dirfrag_t dirfrag;
+  filepath path;
+
+ public:
+  mds_rank_t get_source_mds() const { return from; }
+  inodeno_t get_ino() const { return dirfrag.ino; }
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  const filepath& get_path() const { return path; }
+
+  bool started;
+
+protected:
+  MExportDirDiscover() :     
+    MMDSOp{MSG_MDS_EXPORTDIRDISCOVER, HEAD_VERSION, COMPAT_VERSION},
+    started(false) { }
+  MExportDirDiscover(dirfrag_t df, filepath& p, mds_rank_t f, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRDISCOVER, HEAD_VERSION, COMPAT_VERSION},
+    from(f), dirfrag(df), path(p), started(false) {
+    set_tid(tid);
+  }
+  ~MExportDirDiscover() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExDis"; }
+  void print(std::ostream& o) const override {
+    o << "export_discover(" << dirfrag << " " << path << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(from, p);
+    decode(dirfrag, p);
+    decode(path, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(from, payload);
+    encode(dirfrag, payload);
+    encode(path, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirDiscoverAck.h b/src/messages/MExportDirDiscoverAck.h
new file mode 100644
index 000000000..3d7870b22
--- /dev/null
+++ b/src/messages/MExportDirDiscoverAck.h
@@ -0,0 +1,71 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRDISCOVERACK_H
+#define CEPH_MEXPORTDIRDISCOVERACK_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirDiscoverAck final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t dirfrag;
+  bool success;
+
+ public:
+  inodeno_t get_ino() const { return dirfrag.ino; }
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  bool is_success() const { return success; }
+
+protected:
+  MExportDirDiscoverAck() : MMDSOp{MSG_MDS_EXPORTDIRDISCOVERACK, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportDirDiscoverAck(dirfrag_t df, uint64_t tid, bool s=true) :
+    MMDSOp{MSG_MDS_EXPORTDIRDISCOVERACK, HEAD_VERSION, COMPAT_VERSION},
+    dirfrag(df), success(s) {
+    set_tid(tid);
+  }
+  ~MExportDirDiscoverAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExDisA"; }
+  void print(std::ostream& o) const override {
+    o << "export_discover_ack(" << dirfrag;
+    if (success) 
+      o << " success)";
+    else
+      o << " failure)";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(success, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(success, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirFinish.h b/src/messages/MExportDirFinish.h
new file mode 100644
index 000000000..f69130149
--- /dev/null
+++ b/src/messages/MExportDirFinish.h
@@ -0,0 +1,65 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRFINISH_H
+#define CEPH_MEXPORTDIRFINISH_H
+
+#include "messages/MMDSOp.h"
+
+class MExportDirFinish final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t dirfrag;
+  bool last;
+
+ public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  bool is_last() const { return last; }
+  
+protected:
+  MExportDirFinish() :
+    MMDSOp{MSG_MDS_EXPORTDIRFINISH, HEAD_VERSION, COMPAT_VERSION}, last(false) {}
+  MExportDirFinish(dirfrag_t df, bool l, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRFINISH, HEAD_VERSION, COMPAT_VERSION}, dirfrag(df), last(l) {
+    set_tid(tid);
+  }
+  ~MExportDirFinish() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExFin"; }
+  void print(std::ostream& o) const override {
+    o << "export_finish(" << dirfrag << (last ? " last" : "") << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(last, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(last, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirNotify.h b/src/messages/MExportDirNotify.h
new file mode 100644
index 000000000..d6f0f4e77
--- /dev/null
+++ b/src/messages/MExportDirNotify.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRNOTIFY_H
+#define CEPH_MEXPORTDIRNOTIFY_H
+
+#include "messages/MMDSOp.h"
+
+class MExportDirNotify final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t base;
+  bool ack;
+  std::pair<__s32,__s32> old_auth, new_auth;
+  std::list<dirfrag_t> bounds;  // bounds; these dirs are _not_ included (tho the dirfragdes are)
+
+ public:
+  dirfrag_t get_dirfrag() const { return base; }
+  std::pair<__s32,__s32> get_old_auth() const { return old_auth; }
+  std::pair<__s32,__s32> get_new_auth() const { return new_auth; }
+  bool wants_ack() const { return ack; }
+  const std::list<dirfrag_t>& get_bounds() const { return bounds; }
+  std::list<dirfrag_t>& get_bounds() { return bounds; }
+
+protected:
+  MExportDirNotify() :
+    MMDSOp{MSG_MDS_EXPORTDIRNOTIFY, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportDirNotify(dirfrag_t i, uint64_t tid, bool a, std::pair<__s32,__s32> oa,
+		   std::pair<__s32,__s32> na) :
+    MMDSOp{MSG_MDS_EXPORTDIRNOTIFY, HEAD_VERSION, COMPAT_VERSION},
+    base(i), ack(a), old_auth(oa), new_auth(na) {
+    set_tid(tid);
+  }
+  ~MExportDirNotify() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExNot"; }
+  void print(std::ostream& o) const override {
+    o << "export_notify(" << base;
+    o << " " << old_auth << " -> " << new_auth;
+    if (ack) 
+      o << " ack)";
+    else
+      o << " no ack)";
+  }
+  
+  void copy_bounds(std::list<dirfrag_t>& ex) {
+    this->bounds = ex;
+  }
+  void copy_bounds(std::set<dirfrag_t>& ex) {
+    for (auto i = ex.begin(); i != ex.end(); ++i)
+      bounds.push_back(*i);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base, payload);
+    encode(ack, payload);
+    encode(old_auth, payload);
+    encode(new_auth, payload);
+    encode(bounds, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base, p);
+    decode(ack, p);
+    decode(old_auth, p);
+    decode(new_auth, p);
+    decode(bounds, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirNotifyAck.h b/src/messages/MExportDirNotifyAck.h
new file mode 100644
index 000000000..0dd3f46b2
--- /dev/null
+++ b/src/messages/MExportDirNotifyAck.h
@@ -0,0 +1,65 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRNOTIFYACK_H
+#define CEPH_MEXPORTDIRNOTIFYACK_H
+
+#include "messages/MMDSOp.h"
+
+class MExportDirNotifyAck final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t dirfrag;
+  std::pair<__s32,__s32> new_auth;
+
+ public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  std::pair<__s32,__s32> get_new_auth() const { return new_auth; }
+  
+protected:
+  MExportDirNotifyAck() :
+    MMDSOp{MSG_MDS_EXPORTDIRNOTIFYACK, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportDirNotifyAck(dirfrag_t df, uint64_t tid, std::pair<__s32,__s32> na) :
+    MMDSOp{MSG_MDS_EXPORTDIRNOTIFYACK, HEAD_VERSION, COMPAT_VERSION}, dirfrag(df), new_auth(na) {
+    set_tid(tid);
+  }
+  ~MExportDirNotifyAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExNotA"; }
+  void print(std::ostream& o) const override {
+    o << "export_notify_ack(" << dirfrag << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(new_auth, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(new_auth, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirPrep.h b/src/messages/MExportDirPrep.h
new file mode 100644
index 000000000..0927ff9f5
--- /dev/null
+++ b/src/messages/MExportDirPrep.h
@@ -0,0 +1,95 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MEXPORTDIRPREP_H
+#define CEPH_MEXPORTDIRPREP_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirPrep final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t dirfrag;
+public:
+  ceph::buffer::list basedir;
+  std::list<dirfrag_t> bounds;
+  std::list<ceph::buffer::list> traces;
+private:
+  std::set<mds_rank_t> bystanders;
+  bool b_did_assim = false;
+
+public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+  const std::list<dirfrag_t>& get_bounds() const { return bounds; }
+  const std::set<mds_rank_t> &get_bystanders() const { return bystanders; }
+
+  bool did_assim() const { return b_did_assim; }
+  void mark_assim() { b_did_assim = true; }
+
+protected:
+  MExportDirPrep() = default;
+  MExportDirPrep(dirfrag_t df, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRPREP, HEAD_VERSION, COMPAT_VERSION},
+    dirfrag(df)
+  {
+    set_tid(tid);
+  }
+  ~MExportDirPrep() final {}
+
+public:
+  std::string_view get_type_name() const override { return "ExP"; }
+  void print(std::ostream& o) const override {
+    o << "export_prep(" << dirfrag << ")";
+  }
+
+  void add_bound(dirfrag_t df) {
+    bounds.push_back( df );
+  }
+  void add_trace(ceph::buffer::list& bl) {
+    traces.push_back(bl);
+  }
+  void add_bystander(mds_rank_t who) {
+    bystanders.insert(who);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(basedir, p);
+    decode(bounds, p);
+    decode(traces, p);
+    decode(bystanders, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(basedir, payload);
+    encode(bounds, payload);
+    encode(traces, payload);
+    encode(bystanders, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MExportDirPrepAck.h b/src/messages/MExportDirPrepAck.h
new file mode 100644
index 000000000..b51182d45
--- /dev/null
+++ b/src/messages/MExportDirPrepAck.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEXPORTDIRPREPACK_H
+#define CEPH_MEXPORTDIRPREPACK_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MExportDirPrepAck final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t dirfrag;
+  bool success = false;
+
+ public:
+  dirfrag_t get_dirfrag() const { return dirfrag; }
+
+protected:
+  MExportDirPrepAck() :
+    MMDSOp{MSG_MDS_EXPORTDIRPREPACK, HEAD_VERSION, COMPAT_VERSION} {}
+  MExportDirPrepAck(dirfrag_t df, bool s, uint64_t tid) :
+    MMDSOp{MSG_MDS_EXPORTDIRPREPACK, HEAD_VERSION, COMPAT_VERSION}, dirfrag(df), success(s) {
+    set_tid(tid);
+  }
+  ~MExportDirPrepAck() final {}
+
+public:  
+  bool is_success() const { return success; }
+  std::string_view get_type_name() const override { return "ExPAck"; }
+  void print(std::ostream& o) const override {
+    o << "export_prep_ack(" << dirfrag << (success ? " success)" : " fail)");
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(dirfrag, p);
+    decode(success, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(dirfrag, payload);
+    encode(success, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MFSMap.h b/src/messages/MFSMap.h
new file mode 100644
index 000000000..fff7529d3
--- /dev/null
+++ b/src/messages/MFSMap.h
@@ -0,0 +1,62 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MFSMAP_H
+#define CEPH_MFSMAP_H
+
+#include "msg/Message.h"
+#include "mds/FSMap.h"
+#include "include/ceph_features.h"
+
+class MFSMap final : public Message {
+public:
+  epoch_t epoch;
+
+  version_t get_epoch() const { return epoch; }
+  const FSMap& get_fsmap() const {return fsmap;}
+
+  MFSMap() : 
+    Message{CEPH_MSG_FS_MAP}, epoch(0) {}
+  MFSMap(const uuid_d &f, const FSMap &fsmap_) :
+    Message{CEPH_MSG_FS_MAP},
+    epoch(fsmap_.get_epoch()),
+    fsmap{fsmap_}
+  {}
+private:
+  FSMap fsmap;
+
+  ~MFSMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "fsmap"; }
+  void print(std::ostream& out) const override {
+    out << "fsmap(e " << epoch << ")";
+  }
+
+  // marshalling
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(fsmap, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(fsmap, payload, features);
+  }
+};
+
+#endif
diff --git a/src/messages/MFSMapUser.h b/src/messages/MFSMapUser.h
new file mode 100644
index 000000000..2d4192841
--- /dev/null
+++ b/src/messages/MFSMapUser.h
@@ -0,0 +1,64 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MFSMAPCOMPACT_H
+#define CEPH_MFSMAPCOMPACT_H
+
+#include "msg/Message.h"
+#include "mds/FSMapUser.h"
+#include "include/ceph_features.h"
+
+class MFSMapUser final : public Message {
+public:
+  epoch_t epoch;
+
+  version_t get_epoch() const { return epoch; }
+  const FSMapUser& get_fsmap() const { return fsmap; }
+
+  MFSMapUser() :
+    Message{CEPH_MSG_FS_MAP_USER}, epoch(0) {}
+  MFSMapUser(const uuid_d &f, const FSMapUser &fsmap_) :
+    Message{CEPH_MSG_FS_MAP_USER},
+    epoch(fsmap_.epoch),
+    fsmap{fsmap_}
+  {}
+private:
+  FSMapUser fsmap;
+
+  ~MFSMapUser() final {}
+
+public:
+  std::string_view get_type_name() const override { return "fsmap.user"; }
+  void print(std::ostream& out) const override {
+    out << "fsmap.user(e " << epoch << ")";
+  }
+
+  // marshalling
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(fsmap, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(fsmap, payload, features);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MForward.h b/src/messages/MForward.h
new file mode 100644
index 000000000..b6fef9e5b
--- /dev/null
+++ b/src/messages/MForward.h
@@ -0,0 +1,158 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ * Client requests often need to get forwarded from some monitor
+ * to the leader. This class encapsulates the original message
+ * along with the client's caps so the leader can do proper permissions
+ * checking.
+ */
+
+#ifndef CEPH_MFORWARD_H
+#define CEPH_MFORWARD_H
+
+#include "msg/Message.h"
+#include "mon/MonCap.h"
+#include "include/encoding.h"
+#include "include/stringify.h"
+
+class MForward final : public Message {
+public:
+  uint64_t tid;
+  uint8_t client_type;
+  entity_addrvec_t client_addrs;
+  entity_addr_t client_socket_addr;
+  MonCap client_caps;
+  uint64_t con_features;
+  EntityName entity_name;
+  PaxosServiceMessage *msg;   // incoming or outgoing message
+
+  std::string msg_desc;  // for operator<< only
+
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 4;
+
+  MForward() : Message{MSG_FORWARD, HEAD_VERSION, COMPAT_VERSION},
+               tid(0), con_features(0), msg(NULL) {}
+  MForward(uint64_t t, PaxosServiceMessage *m, uint64_t feat,
+           const MonCap& caps) :
+    Message{MSG_FORWARD, HEAD_VERSION, COMPAT_VERSION},
+    tid(t), client_caps(caps), msg(NULL) {
+    client_type = m->get_source().type();
+    client_addrs = m->get_source_addrs();
+    if (auto &con = m->get_connection()) {
+      client_socket_addr = con->get_peer_socket_addr();
+    }
+    con_features = feat;
+    msg = (PaxosServiceMessage*)m->get();
+  }
+private:
+  ~MForward() final {
+    if (msg) {
+      // message was unclaimed
+      msg->put();
+      msg = NULL;
+    }
+  }
+
+public:
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      header.version = 3;
+      header.compat_version = 3;
+      encode(tid, payload);
+      entity_inst_t client;
+      client.name = entity_name_t(client_type, -1);
+      client.addr = client_addrs.legacy_addr();
+      encode(client, payload, features);
+      encode(client_caps, payload, features);
+      // Encode client message with intersection of target and source
+      // features.  This could matter if the semantics of the encoded
+      // message are changed when reencoding with more features than the
+      // client had originally.  That should never happen, but we may as
+      // well be defensive here.
+      if (con_features != features) {
+	msg->clear_payload();
+      }
+      encode_message(msg, features & con_features, payload);
+      encode(con_features, payload);
+      encode(entity_name, payload);
+      return;
+    }
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(tid, payload);
+    encode(client_type, payload, features);
+    encode(client_addrs, payload, features);
+    encode(client_socket_addr, payload, features);
+    encode(client_caps, payload, features);
+    // Encode client message with intersection of target and source
+    // features.  This could matter if the semantics of the encoded
+    // message are changed when reencoding with more features than the
+    // client had originally.  That should never happen, but we may as
+    // well be defensive here.
+    if (con_features != features) {
+      msg->clear_payload();
+    }
+    encode_message(msg, features & con_features, payload);
+    encode(con_features, payload);
+    encode(entity_name, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(tid, p);
+    if (header.version < 4) {
+      entity_inst_t client;
+      decode(client, p);
+      client_type = client.name.type();
+      client_addrs = entity_addrvec_t(client.addr);
+      client_socket_addr = client.addr;
+    } else {
+      decode(client_type, p);
+      decode(client_addrs, p);
+      decode(client_socket_addr, p);
+    }
+    decode(client_caps, p);
+    msg = (PaxosServiceMessage *)decode_message(NULL, 0, p);
+    decode(con_features, p);
+    decode(entity_name, p);
+  }
+
+  PaxosServiceMessage *claim_message() {
+    // let whoever is claiming the message deal with putting it.
+    ceph_assert(msg);
+    msg_desc = stringify(*msg);
+    PaxosServiceMessage *m = msg;
+    msg = NULL;
+    return m;
+  }
+
+  std::string_view get_type_name() const override { return "forward"; }
+  void print(std::ostream& o) const override {
+    o << "forward(";
+    if (msg) {
+      o << *msg;
+    } else {
+      o << msg_desc;
+    }
+    o << " caps " << client_caps
+      << " tid " << tid
+      << " con_features " << con_features << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+  
+#endif
diff --git a/src/messages/MGatherCaps.h b/src/messages/MGatherCaps.h
new file mode 100644
index 000000000..35ae7fdcd
--- /dev/null
+++ b/src/messages/MGatherCaps.h
@@ -0,0 +1,41 @@
+#ifndef CEPH_MGATHERCAPS_H
+#define CEPH_MGATHERCAPS_H
+
+#include "messages/MMDSOp.h"
+
+
+class MGatherCaps final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  inodeno_t ino;
+
+protected:
+  MGatherCaps() :
+    MMDSOp{MSG_MDS_GATHERCAPS, HEAD_VERSION, COMPAT_VERSION} {}
+  ~MGatherCaps() final {}
+
+public:
+  std::string_view get_type_name() const override { return "gather_caps"; }
+  void print(std::ostream& o) const override {
+    o << "gather_caps(" << ino << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MGenericMessage.h b/src/messages/MGenericMessage.h
new file mode 100644
index 000000000..32699728a
--- /dev/null
+++ b/src/messages/MGenericMessage.h
@@ -0,0 +1,40 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MGENERICMESSAGE_H
+#define CEPH_MGENERICMESSAGE_H
+
+#include "msg/Message.h"
+
+class MGenericMessage : public Message {
+private:
+  char tname[20];
+  //long pcid;
+
+ public:
+  MGenericMessage(int t=0) : Message{t} {
+    snprintf(tname, sizeof(tname), "generic%d", get_type());
+  }
+
+  //void set_pcid(long pcid) { this->pcid = pcid; }
+  //long get_pcid() { return pcid; }
+
+  std::string_view get_type_name() const override { return tname; }
+
+  void decode_payload() override { }
+  void encode_payload(uint64_t features) override { }
+};
+
+#endif
diff --git a/src/messages/MGetConfig.h b/src/messages/MGetConfig.h
new file mode 100644
index 000000000..2575aa4bc
--- /dev/null
+++ b/src/messages/MGetConfig.h
@@ -0,0 +1,48 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+
+class MGetConfig : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  EntityName name;  ///< e.g., mon.a, client.foo
+  std::string host;      ///< our hostname
+  std::string device_class;
+
+  MGetConfig() : Message{MSG_GET_CONFIG, HEAD_VERSION, COMPAT_VERSION} { }
+  MGetConfig(const EntityName& n, const std::string& h)
+    : Message{MSG_GET_CONFIG, HEAD_VERSION, COMPAT_VERSION},
+      name(n),
+      host(h) {}
+
+  std::string_view get_type_name() const override {
+    return "get_config";
+  }
+  void print(std::ostream& o) const override {
+    o << "get_config(" << name << "@" << host;
+    if (device_class.size()) {
+      o << " device_class " << device_class;
+    }
+    o << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(name, p);
+    decode(host, p);
+    decode(device_class, p);
+  }
+
+  void encode_payload(uint64_t) override {
+    using ceph::encode;
+    encode(name, payload);
+    encode(host, payload);
+    encode(device_class, payload);
+  }
+};
diff --git a/src/messages/MGetPoolStats.h b/src/messages/MGetPoolStats.h
new file mode 100644
index 000000000..82d1fcd2d
--- /dev/null
+++ b/src/messages/MGetPoolStats.h
@@ -0,0 +1,57 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MGETPOOLSTATS_H
+#define CEPH_MGETPOOLSTATS_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MGetPoolStats final : public PaxosServiceMessage {
+public:
+  uuid_d fsid;
+  std::vector<std::string> pools;
+
+  MGetPoolStats() : PaxosServiceMessage{MSG_GETPOOLSTATS, 0} {}
+  MGetPoolStats(const uuid_d& f, ceph_tid_t t, std::vector<std::string>& ls, version_t l) :
+    PaxosServiceMessage{MSG_GETPOOLSTATS, l},
+    fsid(f), pools(ls) {
+    set_tid(t);
+  }
+
+private:
+  ~MGetPoolStats() final {}
+
+public:
+  std::string_view get_type_name() const override { return "getpoolstats"; }
+  void print(std::ostream& out) const override {
+    out << "getpoolstats(" << get_tid() << " " << pools << " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(pools, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(pools, p);
+  }
+};
+
+#endif
diff --git a/src/messages/MGetPoolStatsReply.h b/src/messages/MGetPoolStatsReply.h
new file mode 100644
index 000000000..eaf95d4a0
--- /dev/null
+++ b/src/messages/MGetPoolStatsReply.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MGETPOOLSTATSREPLY_H
+#define CEPH_MGETPOOLSTATSREPLY_H
+
+class MGetPoolStatsReply final : public PaxosServiceMessage {
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  uuid_d fsid;
+  boost::container::flat_map<std::string, pool_stat_t> pool_stats;
+  bool per_pool = false;
+
+  MGetPoolStatsReply() : PaxosServiceMessage{MSG_GETPOOLSTATSREPLY, 0,
+					     HEAD_VERSION, COMPAT_VERSION} {}
+  MGetPoolStatsReply(uuid_d& f, ceph_tid_t t, version_t v) :
+    PaxosServiceMessage{MSG_GETPOOLSTATSREPLY, v,
+			HEAD_VERSION, COMPAT_VERSION},
+    fsid(f) {
+    set_tid(t);
+  }
+
+private:
+  ~MGetPoolStatsReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "getpoolstats"; }
+  void print(std::ostream& out) const override {
+    out << "getpoolstatsreply(" << get_tid();
+    if (per_pool)
+      out << " per_pool";
+    out << " v" << version <<  ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(pool_stats, payload, features);
+    encode(per_pool, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(pool_stats, p);
+    if (header.version >= 2) {
+      decode(per_pool, p);
+    } else {
+      per_pool = false;
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MHeartbeat.h b/src/messages/MHeartbeat.h
new file mode 100644
index 000000000..3889b3065
--- /dev/null
+++ b/src/messages/MHeartbeat.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MHEARTBEAT_H
+#define CEPH_MHEARTBEAT_H
+
+#include "include/types.h"
+#include "common/DecayCounter.h"
+#include "messages/MMDSOp.h"
+
+class MHeartbeat final : public MMDSOp {
+private:
+  mds_load_t load;
+  __s32 beat = 0;
+  std::map<mds_rank_t, float> import_map;
+
+ public:
+  const mds_load_t& get_load() const { return load; }
+  int get_beat() const { return beat; }
+
+  const std::map<mds_rank_t, float>& get_import_map() const { return import_map; }
+  std::map<mds_rank_t, float>& get_import_map() { return import_map; }
+
+protected:
+  MHeartbeat() : MMDSOp(MSG_MDS_HEARTBEAT), load(DecayRate()) {}
+  MHeartbeat(mds_load_t& load, int beat)
+    : MMDSOp(MSG_MDS_HEARTBEAT),
+      load(load),
+      beat(beat)
+  {}
+  ~MHeartbeat() final {}
+
+public:
+  std::string_view get_type_name() const override { return "HB"; }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(load, payload);
+    encode(beat, payload);
+    encode(import_map, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(load, p);
+    decode(beat, p);
+    decode(import_map, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MInodeFileCaps.h b/src/messages/MInodeFileCaps.h
new file mode 100644
index 000000000..f8fc6fce6
--- /dev/null
+++ b/src/messages/MInodeFileCaps.h
@@ -0,0 +1,65 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MINODEFILECAPS_H
+#define CEPH_MINODEFILECAPS_H
+
+#include "messages/MMDSOp.h"
+
+class MInodeFileCaps final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  inodeno_t ino;
+  __u32     caps = 0;
+
+public:
+  inodeno_t get_ino() const { return ino; }
+  int       get_caps() const { return caps; }
+
+protected:
+  MInodeFileCaps() : MMDSOp(MSG_MDS_INODEFILECAPS, HEAD_VERSION, COMPAT_VERSION) {}
+  MInodeFileCaps(inodeno_t ino, int caps) :
+    MMDSOp(MSG_MDS_INODEFILECAPS, HEAD_VERSION, COMPAT_VERSION) {
+    this->ino = ino;
+    this->caps = caps;
+  }
+  ~MInodeFileCaps() final {}
+
+public:
+  std::string_view get_type_name() const override { return "inode_file_caps";}
+  void print(std::ostream& out) const override {
+    out << "inode_file_caps(" << ino << " " << ccap_string(caps) << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(caps, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(caps, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MKVData.h b/src/messages/MKVData.h
new file mode 100644
index 000000000..d6182efd3
--- /dev/null
+++ b/src/messages/MKVData.h
@@ -0,0 +1,48 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+
+class MKVData : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  version_t version;
+  std::string prefix;
+  bool incremental = false;
+
+  // use transparent comparator so we can lookup in it by std::string_view keys
+  std::map<std::string,std::optional<bufferlist>,std::less<>> data;
+
+  MKVData() : Message{MSG_KV_DATA, HEAD_VERSION, COMPAT_VERSION} { }
+
+  std::string_view get_type_name() const override {
+    return "kv_data";
+  }
+  void print(std::ostream& o) const override {
+    o << "kv_data(v" << version
+      << " prefix " << prefix << ", "
+      << (incremental ? "incremental, " : "full, ")
+      << data.size() << " keys" << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(version, p);
+    decode(prefix, p);
+    decode(incremental, p);
+    decode(data, p);
+  }
+
+  void encode_payload(uint64_t) override {
+    using ceph::encode;
+    encode(version, payload);
+    encode(prefix, payload);
+    encode(incremental, payload);
+    encode(data, payload);
+  }
+};
diff --git a/src/messages/MLock.h b/src/messages/MLock.h
new file mode 100644
index 000000000..7eb5ec098
--- /dev/null
+++ b/src/messages/MLock.h
@@ -0,0 +1,108 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MLOCK_H
+#define CEPH_MLOCK_H
+
+#include "mds/locks.h"
+#include "mds/SimpleLock.h"
+#include "messages/MMDSOp.h"
+
+class MLock final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  int32_t     action = 0;  // action type
+  mds_rank_t  asker = 0;  // who is initiating this request
+  metareqid_t reqid;  // for remote lock requests
+  
+  __u16      lock_type = 0;  // lock object type
+  MDSCacheObjectInfo object_info;  
+  
+  ceph::buffer::list lockdata;  // and possibly some data
+  
+public:
+  ceph::buffer::list& get_data() { return lockdata; }
+  const ceph::buffer::list& get_data() const { return lockdata; }
+  int get_asker() const { return asker; }
+  int get_action() const { return action; }
+  metareqid_t get_reqid() const { return reqid; }
+  
+  int get_lock_type() const { return lock_type; }
+  const MDSCacheObjectInfo &get_object_info() const { return object_info; }
+  MDSCacheObjectInfo &get_object_info() { return object_info; }
+
+protected:
+  MLock() : MMDSOp{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION} {}
+  MLock(int ac, mds_rank_t as) :
+    MMDSOp{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
+    action(ac), asker(as),
+    lock_type(0) { }
+  MLock(SimpleLock *lock, int ac, mds_rank_t as) :
+    MMDSOp{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
+    action(ac), asker(as),
+    lock_type(lock->get_type()) {
+    lock->get_parent()->set_object_info(object_info);
+  }
+  MLock(SimpleLock *lock, int ac, mds_rank_t as, ceph::buffer::list& bl) :
+    MMDSOp{MSG_MDS_LOCK, HEAD_VERSION, COMPAT_VERSION},
+    action(ac), asker(as), lock_type(lock->get_type()) {
+    lock->get_parent()->set_object_info(object_info);
+    lockdata = std::move(bl);
+  }
+  ~MLock() final {}
+  
+public:
+  std::string_view get_type_name() const override { return "ILock"; }
+  void print(std::ostream& out) const override {
+    out << "lock(a=" << SimpleLock::get_lock_action_name(action)
+	<< " " << SimpleLock::get_lock_type_name(lock_type)
+	<< " " << object_info
+	<< ")";
+  }
+  
+  void set_reqid(metareqid_t ri) { reqid = ri; }
+  void set_data(const ceph::buffer::list& lockdata) {
+    this->lockdata = lockdata;
+  }
+  
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(asker, p);
+    decode(action, p);
+    decode(reqid, p);
+    decode(lock_type, p);
+    decode(object_info, p);
+    decode(lockdata, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(asker, payload);
+    encode(action, payload);
+    encode(reqid, payload);
+    encode(lock_type, payload);
+    encode(object_info, payload);
+    encode(lockdata, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MLog.h b/src/messages/MLog.h
new file mode 100644
index 000000000..e38aab904
--- /dev/null
+++ b/src/messages/MLog.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MLOG_H
+#define CEPH_MLOG_H
+
+#include "common/LogEntry.h"
+#include "messages/PaxosServiceMessage.h"
+
+#include <deque>
+
+class MLog final : public PaxosServiceMessage {
+public:
+  uuid_d fsid;
+  std::deque<LogEntry> entries;
+
+  MLog() : PaxosServiceMessage{MSG_LOG, 0} {}
+  MLog(const uuid_d& f, std::deque<LogEntry>&& e)
+    : PaxosServiceMessage{MSG_LOG, 0}, fsid(f), entries{std::move(e)} { }
+  MLog(const uuid_d& f) : PaxosServiceMessage(MSG_LOG, 0), fsid(f) { }
+private:
+  ~MLog() final {}
+
+public:
+  std::string_view get_type_name() const override { return "log"; }
+  void print(std::ostream& out) const override {
+    out << "log(";
+    if (entries.size())
+      out << entries.size() << " entries from seq " << entries.front().seq
+	  << " at " << entries.front().stamp;
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(entries, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(entries, p);
+  }
+};
+
+#endif
diff --git a/src/messages/MLogAck.h b/src/messages/MLogAck.h
new file mode 100644
index 000000000..5949157e2
--- /dev/null
+++ b/src/messages/MLogAck.h
@@ -0,0 +1,62 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MLOGACK_H
+#define CEPH_MLOGACK_H
+
+#include <iostream>
+#include <string>
+#include <string_view>
+
+#include "include/uuid.h"
+
+#include "msg/Message.h"
+
+class MLogAck final : public Message {
+public:
+  uuid_d fsid;
+  version_t last = 0;
+  std::string channel;
+
+  MLogAck() : Message{MSG_LOGACK} {}
+  MLogAck(uuid_d& f, version_t l) : Message{MSG_LOGACK}, fsid(f), last(l) {}
+private:
+  ~MLogAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "log_ack"; }
+  void print(std::ostream& out) const override {
+    out << "log(last " << last << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(last, payload);
+    encode(channel, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(last, p);
+    if (!p.end())
+      decode(channel, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSBeacon.h b/src/messages/MMDSBeacon.h
new file mode 100644
index 000000000..f2fa150be
--- /dev/null
+++ b/src/messages/MMDSBeacon.h
@@ -0,0 +1,326 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSBEACON_H
+#define CEPH_MMDSBEACON_H
+
+#include <string_view>
+
+#include "msg/Message.h"
+#include "messages/PaxosServiceMessage.h"
+
+#include "include/types.h"
+
+#include "mds/MDSMap.h"
+
+
+
+/**
+ * Unique ID for each type of metric we can send to the mon, so that if the mon
+ * knows about the IDs then it can implement special behaviour for certain
+ * messages.
+ */
+enum mds_metric_t {
+  MDS_HEALTH_NULL = 0,
+  MDS_HEALTH_TRIM,
+  MDS_HEALTH_CLIENT_RECALL,
+  MDS_HEALTH_CLIENT_LATE_RELEASE,
+  MDS_HEALTH_CLIENT_RECALL_MANY,
+  MDS_HEALTH_CLIENT_LATE_RELEASE_MANY,
+  MDS_HEALTH_CLIENT_OLDEST_TID,
+  MDS_HEALTH_CLIENT_OLDEST_TID_MANY,
+  MDS_HEALTH_DAMAGE,
+  MDS_HEALTH_READ_ONLY,
+  MDS_HEALTH_SLOW_REQUEST,
+  MDS_HEALTH_CACHE_OVERSIZED,
+  MDS_HEALTH_SLOW_METADATA_IO,
+  MDS_HEALTH_DUMMY, // not a real health warning, for testing
+};
+
+inline const char *mds_metric_name(mds_metric_t m)
+{
+  switch (m) {
+  case MDS_HEALTH_TRIM: return "MDS_TRIM";
+  case MDS_HEALTH_CLIENT_RECALL: return "MDS_CLIENT_RECALL";
+  case MDS_HEALTH_CLIENT_LATE_RELEASE: return "MDS_CLIENT_LATE_RELEASE";
+  case MDS_HEALTH_CLIENT_RECALL_MANY: return "MDS_CLIENT_RECALL_MANY";
+  case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY: return "MDS_CLIENT_LATE_RELEASE_MANY";
+  case MDS_HEALTH_CLIENT_OLDEST_TID: return "MDS_CLIENT_OLDEST_TID";
+  case MDS_HEALTH_CLIENT_OLDEST_TID_MANY: return "MDS_CLIENT_OLDEST_TID_MANY";
+  case MDS_HEALTH_DAMAGE: return "MDS_DAMAGE";
+  case MDS_HEALTH_READ_ONLY: return "MDS_READ_ONLY";
+  case MDS_HEALTH_SLOW_REQUEST: return "MDS_SLOW_REQUEST";
+  case MDS_HEALTH_CACHE_OVERSIZED: return "MDS_CACHE_OVERSIZED";
+  case MDS_HEALTH_SLOW_METADATA_IO: return "MDS_SLOW_METADATA_IO";
+  case MDS_HEALTH_DUMMY: return "MDS_DUMMY";
+  default:
+    return "???";
+  }
+}
+
+inline const char *mds_metric_summary(mds_metric_t m)
+{
+  switch (m) {
+  case MDS_HEALTH_TRIM:
+    return "%num% MDSs behind on trimming";
+  case MDS_HEALTH_CLIENT_RECALL:
+    return "%num% clients failing to respond to cache pressure";
+  case MDS_HEALTH_CLIENT_LATE_RELEASE:
+    return "%num% clients failing to respond to capability release";
+  case MDS_HEALTH_CLIENT_RECALL_MANY:
+    return "%num% MDSs have many clients failing to respond to cache pressure";
+  case MDS_HEALTH_CLIENT_LATE_RELEASE_MANY:
+    return "%num% MDSs have many clients failing to respond to capability "
+      "release";
+  case MDS_HEALTH_CLIENT_OLDEST_TID:
+    return "%num% clients failing to advance oldest client/flush tid";
+  case MDS_HEALTH_CLIENT_OLDEST_TID_MANY:
+    return "%num% MDSs have clients failing to advance oldest client/flush tid";
+  case MDS_HEALTH_DAMAGE:
+    return "%num% MDSs report damaged metadata";
+  case MDS_HEALTH_READ_ONLY:
+    return "%num% MDSs are read only";
+  case MDS_HEALTH_SLOW_REQUEST:
+    return "%num% MDSs report slow requests";
+  case MDS_HEALTH_CACHE_OVERSIZED:
+    return "%num% MDSs report oversized cache";
+  case MDS_HEALTH_SLOW_METADATA_IO:
+    return "%num% MDSs report slow metadata IOs";
+  default:
+    return "???";
+  }
+}
+
+/**
+ * This structure is designed to allow some flexibility in how we emit health
+ * complaints, such that:
+ * - The mon doesn't have to have foreknowledge of all possible metrics: we can
+ *   implement new messages in the MDS and have the mon pass them through to the user
+ *   (enables us to do complex checks inside the MDS, and allows mon to be older version
+ *   than MDS)
+ * - The mon has enough information to perform reductions on some types of metric, for
+ *   example complaints about the same client from multiple MDSs where we might want
+ *   to reduce three "client X is stale on MDS y" metrics into one "client X is stale
+ *   on 3 MDSs" message.
+ */
+struct MDSHealthMetric
+{
+  mds_metric_t type;
+  health_status_t sev;
+  std::string message;
+  std::map<std::string, std::string> metadata;
+
+  void encode(ceph::buffer::list& bl) const {
+    ENCODE_START(1, 1, bl);
+    ceph_assert(type != MDS_HEALTH_NULL);
+    encode((uint16_t)type, bl);
+    encode((uint8_t)sev, bl);
+    encode(message, bl);
+    encode(metadata, bl);
+    ENCODE_FINISH(bl);
+  }
+
+  void decode(ceph::buffer::list::const_iterator& bl) {
+    DECODE_START(1, bl);
+    uint16_t raw_type;
+    decode(raw_type, bl);
+    type = (mds_metric_t)raw_type;
+    ceph_assert(type != MDS_HEALTH_NULL);
+    uint8_t raw_sev;
+    decode(raw_sev, bl);
+    sev = (health_status_t)raw_sev;
+    decode(message, bl);
+    decode(metadata, bl);
+    DECODE_FINISH(bl);
+  }
+
+  bool operator==(MDSHealthMetric const &other) const
+  {
+    return (type == other.type && sev == other.sev && message == other.message);
+  }
+
+  MDSHealthMetric() : type(MDS_HEALTH_NULL), sev(HEALTH_OK) {}
+  MDSHealthMetric(mds_metric_t type_, health_status_t sev_, std::string_view message_)
+    : type(type_), sev(sev_), message(message_) {}
+};
+WRITE_CLASS_ENCODER(MDSHealthMetric)
+
+
+/**
+ * Health metrics send by the MDS to the mon, so that the mon can generate
+ * user friendly warnings about undesirable states.
+ */
+struct MDSHealth
+{
+  std::vector<MDSHealthMetric> metrics;
+
+  void encode(ceph::buffer::list& bl) const {
+    ENCODE_START(1, 1, bl);
+    encode(metrics, bl);
+    ENCODE_FINISH(bl);
+  }
+
+  void decode(ceph::buffer::list::const_iterator& bl) {
+    DECODE_START(1, bl);
+    decode(metrics, bl);
+    DECODE_FINISH(bl);
+  }
+
+  bool operator==(MDSHealth const &other) const
+  {
+    return metrics == other.metrics;
+  }
+};
+WRITE_CLASS_ENCODER(MDSHealth)
+
+
+class MMDSBeacon final : public PaxosServiceMessage {
+private:
+
+  static constexpr int HEAD_VERSION = 8;
+  static constexpr int COMPAT_VERSION = 6;
+
+  uuid_d fsid;
+  mds_gid_t global_id = MDS_GID_NONE;
+  std::string name;
+
+  MDSMap::DaemonState state = MDSMap::STATE_NULL;
+  version_t seq = 0;
+
+  CompatSet compat;
+
+  MDSHealth health;
+
+  std::map<std::string, std::string> sys_info;
+
+  uint64_t mds_features = 0;
+
+  std::string fs;
+
+protected:
+  MMDSBeacon() : PaxosServiceMessage(MSG_MDS_BEACON, 0, HEAD_VERSION, COMPAT_VERSION)
+  {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MMDSBeacon(const uuid_d &f, mds_gid_t g, const std::string& n, epoch_t les,
+	     MDSMap::DaemonState st, version_t se, uint64_t feat) :
+    PaxosServiceMessage(MSG_MDS_BEACON, les, HEAD_VERSION, COMPAT_VERSION),
+    fsid(f), global_id(g), name(n), state(st), seq(se),
+    mds_features(feat) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  ~MMDSBeacon() final {}
+
+public:
+  const uuid_d& get_fsid() const { return fsid; }
+  mds_gid_t get_global_id() const { return global_id; }
+  const std::string& get_name() const { return name; }
+  epoch_t get_last_epoch_seen() const { return version; }
+  MDSMap::DaemonState get_state() const { return state; }
+  version_t get_seq() const { return seq; }
+  std::string_view get_type_name() const override { return "mdsbeacon"; }
+  uint64_t get_mds_features() const { return mds_features; }
+
+  CompatSet const& get_compat() const { return compat; }
+  void set_compat(const CompatSet& c) { compat = c; }
+
+  MDSHealth const& get_health() const { return health; }
+  void set_health(const MDSHealth &h) { health = h; }
+
+  const std::string& get_fs() const { return fs; }
+  void set_fs(std::string_view s) { fs = s; }
+
+  const std::map<std::string, std::string>& get_sys_info() const { return sys_info; }
+  void set_sys_info(const std::map<std::string, std::string>& i) { sys_info = i; }
+
+  void print(std::ostream& out) const override {
+    out << "mdsbeacon(" << global_id << "/" << name
+	<< " " << ceph_mds_state_name(state);
+    if (fs.size()) {
+      out << " fs=" << fs;
+    }
+    out << " seq=" << seq << " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(global_id, payload);
+    encode((__u32)state, payload);
+    encode(seq, payload);
+    encode(name, payload);
+    encode(MDS_RANK_NONE, payload);
+    encode(std::string(), payload);
+    encode(compat, payload);
+    encode(health, payload);
+    if (state == MDSMap::STATE_BOOT) {
+      encode(sys_info, payload);
+    }
+    encode(mds_features, payload);
+    encode(FS_CLUSTER_ID_NONE, payload);
+    encode(false, payload);
+    encode(fs, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(global_id, p);
+    __u32 raw_state;
+    decode(raw_state, p);
+    state = (MDSMap::DaemonState)raw_state;
+    decode(seq, p);
+    decode(name, p);
+    {
+      mds_rank_t standby_for_rank;
+      decode(standby_for_rank, p);
+    }
+    {
+      std::string standby_for_name;
+      decode(standby_for_name, p);
+    }
+    decode(compat, p);
+    decode(health, p);
+    if (state == MDSMap::STATE_BOOT) {
+      decode(sys_info, p);
+    }
+    decode(mds_features, p);
+    {
+      fs_cluster_id_t standby_for_fscid;
+      decode(standby_for_fscid, p);
+    }
+    if (header.version >= 7) {
+      bool standby_replay;
+      decode(standby_replay, p);
+    }
+
+    if (header.version < 7  && state == MDSMap::STATE_STANDBY_REPLAY) {
+      // Old MDS daemons request the state, instead of explicitly
+      // advertising that they are configured as a replay daemon.
+      state = MDSMap::STATE_STANDBY;
+    }
+    if (header.version >= 8) {
+      decode(fs, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSCacheRejoin.h b/src/messages/MMDSCacheRejoin.h
new file mode 100644
index 000000000..a9211d535
--- /dev/null
+++ b/src/messages/MMDSCacheRejoin.h
@@ -0,0 +1,368 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSCACHEREJOIN_H
+#define CEPH_MMDSCACHEREJOIN_H
+
+#include <string_view>
+#include "include/types.h"
+#include "mds/CInode.h"
+#include "mds/CDir.h"
+#include "mds/mdstypes.h"
+#include "messages/MMDSOp.h"
+
+// sent from replica to auth
+
+class MMDSCacheRejoin final : public MMDSOp {
+public:
+  static constexpr int OP_WEAK    = 1;  // replica -> auth, i exist, + maybe open files.
+  static constexpr int OP_STRONG  = 2;  // replica -> auth, i exist, + open files and lock state.
+  static constexpr int OP_ACK     = 3;  // auth -> replica, here is your lock state.
+  static const char *get_opname(int op) {
+    switch (op) {
+    case OP_WEAK: return "weak";
+    case OP_STRONG: return "strong";
+    case OP_ACK: return "ack";
+    default: ceph_abort(); return 0;
+    }
+  }
+
+  // -- types --
+  struct inode_strong { 
+    uint32_t nonce = 0;
+    int32_t caps_wanted = 0;
+    int32_t filelock = 0, nestlock = 0, dftlock = 0;
+    inode_strong() {}
+    inode_strong(int n, int cw, int dl, int nl, int dftl) :
+      nonce(n), caps_wanted(cw),
+      filelock(dl), nestlock(nl), dftlock(dftl) { }
+    void encode(ceph::buffer::list &bl) const {
+      using ceph::encode;
+      encode(nonce, bl);
+      encode(caps_wanted, bl);
+      encode(filelock, bl);
+      encode(nestlock, bl);
+      encode(dftlock, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &bl) {
+      using ceph::decode;
+      decode(nonce, bl);
+      decode(caps_wanted, bl);
+      decode(filelock, bl);
+      decode(nestlock, bl);
+      decode(dftlock, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(inode_strong)
+
+  struct dirfrag_strong {
+    uint32_t nonce = 0;
+    int8_t  dir_rep = 0;
+    dirfrag_strong() {}
+    dirfrag_strong(int n, int dr) : nonce(n), dir_rep(dr) {}
+    void encode(ceph::buffer::list &bl) const {
+      using ceph::encode;
+      encode(nonce, bl);
+      encode(dir_rep, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &bl) {
+      using ceph::decode;
+      decode(nonce, bl);
+      decode(dir_rep, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(dirfrag_strong)
+
+  struct dn_strong {
+    snapid_t first;
+    std::string alternate_name;
+    inodeno_t ino = 0;
+    inodeno_t remote_ino = 0;
+    unsigned char remote_d_type = 0;
+    uint32_t nonce = 0;
+    int32_t lock = 0;
+    dn_strong() = default;
+    dn_strong(snapid_t f, std::string_view altn, inodeno_t pi, inodeno_t ri, unsigned char rdt, int n, int l) :
+      first(f), alternate_name(altn), ino(pi), remote_ino(ri), remote_d_type(rdt), nonce(n), lock(l) {}
+    bool is_primary() const { return ino > 0; }
+    bool is_remote() const { return remote_ino > 0; }
+    bool is_null() const { return ino == 0 && remote_ino == 0; }
+    void encode(ceph::buffer::list &bl) const {
+      using ceph::encode;
+      encode(first, bl);
+      encode(ino, bl);
+      encode(remote_ino, bl);
+      encode(remote_d_type, bl);
+      encode(nonce, bl);
+      encode(lock, bl);
+      encode(alternate_name, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &bl) {
+      using ceph::decode;
+      decode(first, bl);
+      decode(ino, bl);
+      decode(remote_ino, bl);
+      decode(remote_d_type, bl);
+      decode(nonce, bl);
+      decode(lock, bl);
+      decode(alternate_name, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(dn_strong)
+
+  struct dn_weak {
+    snapid_t first;
+    inodeno_t ino = 0;
+    dn_weak() = default;
+    dn_weak(snapid_t f, inodeno_t pi) : first(f), ino(pi) {}
+    void encode(ceph::buffer::list &bl) const {
+      using ceph::encode;
+      encode(first, bl);
+      encode(ino, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &bl) {
+      using ceph::decode;
+      decode(first, bl);
+      decode(ino, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(dn_weak)
+
+  struct lock_bls {
+    ceph::buffer::list file, nest, dft;
+    void encode(ceph::buffer::list& bl) const {
+      using ceph::encode;
+      encode(file, bl);
+      encode(nest, bl);
+      encode(dft, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator& bl) {
+      using ceph::decode;
+      decode(file, bl);
+      decode(nest, bl);
+      decode(dft, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(lock_bls)
+
+  // authpins, xlocks
+  struct peer_reqid {
+    metareqid_t reqid;
+    __u32 attempt;
+    peer_reqid() : attempt(0) {}
+    peer_reqid(const metareqid_t& r, __u32 a)
+      : reqid(r), attempt(a) {}
+    void encode(ceph::buffer::list& bl) const {
+      using ceph::encode;
+      encode(reqid, bl);
+      encode(attempt, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator& bl) {
+      using ceph::decode;
+      decode(reqid, bl);
+      decode(attempt, bl);
+    }
+  };
+
+  std::string_view get_type_name() const override { return "cache_rejoin"; }
+  void print(std::ostream& out) const override {
+    out << "cache_rejoin " << get_opname(op);
+  }
+
+  // -- builders --
+  // inodes
+  void add_weak_inode(vinodeno_t i) {
+    weak_inodes.insert(i);
+  }
+  void add_strong_inode(vinodeno_t i, int n, int cw, int dl, int nl, int dftl) {
+    strong_inodes[i] = inode_strong(n, cw, dl, nl, dftl);
+  }
+  void add_inode_locks(CInode *in, __u32 nonce, ceph::buffer::list& bl) {
+    using ceph::encode;
+    encode(in->ino(), inode_locks);
+    encode(in->last, inode_locks);
+    encode(nonce, inode_locks);
+    encode(bl, inode_locks);
+  }
+  void add_inode_base(CInode *in, uint64_t features) {
+    using ceph::encode;
+    encode(in->ino(), inode_base);
+    encode(in->last, inode_base);
+    ceph::buffer::list bl;
+    in->_encode_base(bl, features);
+    encode(bl, inode_base);
+  }
+  void add_inode_authpin(vinodeno_t ino, const metareqid_t& ri, __u32 attempt) {
+    authpinned_inodes[ino].push_back(peer_reqid(ri, attempt));
+  }
+  void add_inode_frozen_authpin(vinodeno_t ino, const metareqid_t& ri, __u32 attempt) {
+    frozen_authpin_inodes[ino] = peer_reqid(ri, attempt);
+  }
+  void add_inode_xlock(vinodeno_t ino, int lt, const metareqid_t& ri, __u32 attempt) {
+    xlocked_inodes[ino][lt] = peer_reqid(ri, attempt);
+  }
+  void add_inode_wrlock(vinodeno_t ino, int lt, const metareqid_t& ri, __u32 attempt) {
+    wrlocked_inodes[ino][lt].push_back(peer_reqid(ri, attempt));
+  }
+
+  void add_scatterlock_state(CInode *in) {
+    if (inode_scatterlocks.count(in->ino()))
+      return;  // already added this one
+    in->encode_lock_state(CEPH_LOCK_IFILE, inode_scatterlocks[in->ino()].file);
+    in->encode_lock_state(CEPH_LOCK_INEST, inode_scatterlocks[in->ino()].nest);
+    in->encode_lock_state(CEPH_LOCK_IDFT, inode_scatterlocks[in->ino()].dft);
+  }
+
+  // dirfrags
+  void add_strong_dirfrag(dirfrag_t df, int n, int dr) {
+    strong_dirfrags[df] = dirfrag_strong(n, dr);
+  }
+  void add_dirfrag_base(CDir *dir) {
+    ceph::buffer::list& bl = dirfrag_bases[dir->dirfrag()];
+    dir->_encode_base(bl);
+  }
+
+  // dentries
+  void add_weak_dirfrag(dirfrag_t df) {
+    weak_dirfrags.insert(df);
+  }
+  void add_weak_dentry(inodeno_t dirino, std::string_view dname, snapid_t last, dn_weak& dnw) {
+    weak[dirino][string_snap_t(dname, last)] = dnw;
+  }
+  void add_weak_primary_dentry(inodeno_t dirino, std::string_view dname, snapid_t first, snapid_t last, inodeno_t ino) {
+    weak[dirino][string_snap_t(dname, last)] = dn_weak(first, ino);
+  }
+  void add_strong_dentry(dirfrag_t df, std::string_view dname, std::string_view altn, snapid_t first, snapid_t last, inodeno_t pi, inodeno_t ri, unsigned char rdt, int n, int ls) {
+    auto& m = strong_dentries[df];
+    m.insert_or_assign(string_snap_t(dname, last), dn_strong(first, altn, pi, ri, rdt, n, ls));
+  }
+  void add_dentry_authpin(dirfrag_t df, std::string_view dname, snapid_t last,
+			  const metareqid_t& ri, __u32 attempt) {
+    authpinned_dentries[df][string_snap_t(dname, last)].push_back(peer_reqid(ri, attempt));
+  }
+  void add_dentry_xlock(dirfrag_t df, std::string_view dname, snapid_t last,
+			const metareqid_t& ri, __u32 attempt) {
+    xlocked_dentries[df][string_snap_t(dname, last)] = peer_reqid(ri, attempt);
+  }
+
+  // -- encoding --
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(strong_inodes, payload);
+    encode(inode_base, payload);
+    encode(inode_locks, payload);
+    encode(inode_scatterlocks, payload);
+    encode(authpinned_inodes, payload);
+    encode(frozen_authpin_inodes, payload);
+    encode(xlocked_inodes, payload);
+    encode(wrlocked_inodes, payload);
+    encode(cap_exports, payload);
+    encode(client_map, payload, features);
+    encode(imported_caps, payload);
+    encode(strong_dirfrags, payload);
+    encode(dirfrag_bases, payload);
+    encode(weak, payload);
+    encode(weak_dirfrags, payload);
+    encode(weak_inodes, payload);
+    encode(strong_dentries, payload);
+    encode(authpinned_dentries, payload);
+    encode(xlocked_dentries, payload);
+    encode(client_metadata_map, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(op, p);
+    decode(strong_inodes, p);
+    decode(inode_base, p);
+    decode(inode_locks, p);
+    decode(inode_scatterlocks, p);
+    decode(authpinned_inodes, p);
+    decode(frozen_authpin_inodes, p);
+    decode(xlocked_inodes, p);
+    decode(wrlocked_inodes, p);
+    decode(cap_exports, p);
+    decode(client_map, p);
+    decode(imported_caps, p);
+    decode(strong_dirfrags, p);
+    decode(dirfrag_bases, p);
+    decode(weak, p);
+    decode(weak_dirfrags, p);
+    decode(weak_inodes, p);
+    decode(strong_dentries, p);
+    decode(authpinned_dentries, p);
+    decode(xlocked_dentries, p);
+    if (header.version >= 2)
+      decode(client_metadata_map, p);
+  }
+
+  // -- data --
+  int32_t op = 0;
+
+  // weak
+  std::map<inodeno_t, std::map<string_snap_t, dn_weak> > weak;
+  std::set<dirfrag_t> weak_dirfrags;
+  std::set<vinodeno_t> weak_inodes;
+  std::map<inodeno_t, lock_bls> inode_scatterlocks;
+
+  // strong
+  std::map<dirfrag_t, dirfrag_strong> strong_dirfrags;
+  std::map<dirfrag_t, std::map<string_snap_t, dn_strong> > strong_dentries;
+  std::map<vinodeno_t, inode_strong> strong_inodes;
+
+  // open
+  std::map<inodeno_t,std::map<client_t, cap_reconnect_t> > cap_exports;
+  std::map<client_t, entity_inst_t> client_map;
+  std::map<client_t,client_metadata_t> client_metadata_map;
+  ceph::buffer::list imported_caps;
+
+  // full
+  ceph::buffer::list inode_base;
+  ceph::buffer::list inode_locks;
+  std::map<dirfrag_t, ceph::buffer::list> dirfrag_bases;
+
+  std::map<vinodeno_t, std::list<peer_reqid> > authpinned_inodes;
+  std::map<vinodeno_t, peer_reqid> frozen_authpin_inodes;
+  std::map<vinodeno_t, std::map<__s32, peer_reqid> > xlocked_inodes;
+  std::map<vinodeno_t, std::map<__s32, std::list<peer_reqid> > > wrlocked_inodes;
+  std::map<dirfrag_t, std::map<string_snap_t, std::list<peer_reqid> > > authpinned_dentries;
+  std::map<dirfrag_t, std::map<string_snap_t, peer_reqid> > xlocked_dentries;
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  MMDSCacheRejoin(int o) : MMDSCacheRejoin() { op = o; }
+  MMDSCacheRejoin() : MMDSOp{MSG_MDS_CACHEREJOIN, HEAD_VERSION, COMPAT_VERSION} {}
+  ~MMDSCacheRejoin() final {}
+};
+
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::inode_strong)
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::dirfrag_strong)
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::dn_strong)
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::dn_weak)
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::lock_bls)
+WRITE_CLASS_ENCODER(MMDSCacheRejoin::peer_reqid)
+
+inline std::ostream& operator<<(std::ostream& out, const MMDSCacheRejoin::peer_reqid& r) {
+  return out << r.reqid << '.' << r.attempt;
+}
+
+#endif
diff --git a/src/messages/MMDSFindIno.h b/src/messages/MMDSFindIno.h
new file mode 100644
index 000000000..a729296da
--- /dev/null
+++ b/src/messages/MMDSFindIno.h
@@ -0,0 +1,57 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MDSFINDINO_H
+#define CEPH_MDSFINDINO_H
+
+#include "include/filepath.h"
+#include "messages/MMDSOp.h"
+
+class MMDSFindIno final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  ceph_tid_t tid {0};
+  inodeno_t ino;
+
+protected:
+  MMDSFindIno() : MMDSOp{MSG_MDS_FINDINO, HEAD_VERSION, COMPAT_VERSION} {}
+  MMDSFindIno(ceph_tid_t t, inodeno_t i) : MMDSOp{MSG_MDS_FINDINO, HEAD_VERSION, COMPAT_VERSION}, tid(t), ino(i) {}
+  ~MMDSFindIno() final {}
+
+public:
+  std::string_view get_type_name() const override { return "findino"; }
+  void print(std::ostream &out) const override {
+    out << "findino(" << tid << " " << ino << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(tid, payload);
+    encode(ino, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(tid, p);
+    decode(ino, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSFindInoReply.h b/src/messages/MMDSFindInoReply.h
new file mode 100644
index 000000000..274567f0c
--- /dev/null
+++ b/src/messages/MMDSFindInoReply.h
@@ -0,0 +1,57 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MDSFINDINOREPLY_H
+#define CEPH_MDSFINDINOREPLY_H
+
+#include "include/filepath.h"
+#include "messages/MMDSOp.h"
+
+class MMDSFindInoReply final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  ceph_tid_t tid = 0;
+  filepath path;
+
+protected:
+  MMDSFindInoReply() : MMDSOp{MSG_MDS_FINDINOREPLY, HEAD_VERSION, COMPAT_VERSION} {}
+  MMDSFindInoReply(ceph_tid_t t) : MMDSOp{MSG_MDS_FINDINOREPLY, HEAD_VERSION, COMPAT_VERSION}, tid(t) {}
+  ~MMDSFindInoReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "findinoreply"; }
+  void print(std::ostream &out) const override {
+    out << "findinoreply(" << tid << " " << path << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(tid, payload);
+    encode(path, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(tid, p);
+    decode(path, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSFragmentNotify.h b/src/messages/MMDSFragmentNotify.h
new file mode 100644
index 000000000..2bc2ea629
--- /dev/null
+++ b/src/messages/MMDSFragmentNotify.h
@@ -0,0 +1,78 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSFRAGMENTNOTIFY_H
+#define CEPH_MMDSFRAGMENTNOTIFY_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSFragmentNotify final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  dirfrag_t base_dirfrag;
+  int8_t bits = 0;
+  bool ack_wanted = false;
+
+ public:
+  inodeno_t get_ino() const { return base_dirfrag.ino; }
+  frag_t get_basefrag() const { return base_dirfrag.frag; }
+  dirfrag_t get_base_dirfrag() const { return base_dirfrag; }
+  int get_bits() const { return bits; }
+  bool is_ack_wanted() const { return ack_wanted; }
+  void mark_ack_wanted() { ack_wanted = true; }
+
+  ceph::buffer::list basebl;
+
+protected:
+  MMDSFragmentNotify() :
+    MMDSOp{MSG_MDS_FRAGMENTNOTIFY, HEAD_VERSION, COMPAT_VERSION} {}
+  MMDSFragmentNotify(dirfrag_t df, int b, uint64_t tid) :
+    MMDSOp{MSG_MDS_FRAGMENTNOTIFY, HEAD_VERSION, COMPAT_VERSION},
+    base_dirfrag(df), bits(b) {
+    set_tid(tid);
+  }
+  ~MMDSFragmentNotify() final {}
+
+public: 
+  std::string_view get_type_name() const override { return "fragment_notify"; }
+  void print(std::ostream& o) const override {
+    o << "fragment_notify(" << base_dirfrag << " " << (int)bits << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base_dirfrag, payload);
+    encode(bits, payload);
+    encode(basebl, payload);
+    encode(ack_wanted, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base_dirfrag, p);
+    decode(bits, p);
+    decode(basebl, p);
+    if (header.version >= 2)
+      decode(ack_wanted, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);  
+};
+
+#endif
diff --git a/src/messages/MMDSFragmentNotifyAck.h b/src/messages/MMDSFragmentNotifyAck.h
new file mode 100644
index 000000000..ca22183cf
--- /dev/null
+++ b/src/messages/MMDSFragmentNotifyAck.h
@@ -0,0 +1,64 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSFRAGMENTNOTIFYAck_H
+#define CEPH_MMDSFRAGMENTNOTIFYAck_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSFragmentNotifyAck final : public MMDSOp {
+private:
+  dirfrag_t base_dirfrag;
+  int8_t bits = 0;
+
+ public:
+  dirfrag_t get_base_dirfrag() const { return base_dirfrag; }
+  int get_bits() const { return bits; }
+
+  ceph::buffer::list basebl;
+
+protected:
+  MMDSFragmentNotifyAck() : MMDSOp{MSG_MDS_FRAGMENTNOTIFYACK} {}
+  MMDSFragmentNotifyAck(dirfrag_t df, int b, uint64_t tid) :
+    MMDSOp{MSG_MDS_FRAGMENTNOTIFYACK},
+    base_dirfrag(df), bits(b) {
+    set_tid(tid);
+  }
+  ~MMDSFragmentNotifyAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "fragment_notify_ack"; }
+  void print(std::ostream& o) const override {
+    o << "fragment_notify_ack(" << base_dirfrag << " " << (int)bits << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(base_dirfrag, payload);
+    encode(bits, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(base_dirfrag, p);
+    decode(bits, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSLoadTargets.h b/src/messages/MMDSLoadTargets.h
new file mode 100644
index 000000000..ebd96bff1
--- /dev/null
+++ b/src/messages/MMDSLoadTargets.h
@@ -0,0 +1,65 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2009 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSLoadTargets_H
+#define CEPH_MMDSLoadTargets_H
+
+#include "msg/Message.h"
+#include "mds/mdstypes.h"
+#include "messages/PaxosServiceMessage.h"
+#include "include/types.h"
+
+#include <map>
+using std::map;
+
+class MMDSLoadTargets final : public PaxosServiceMessage {
+public:
+  mds_gid_t global_id;
+  std::set<mds_rank_t> targets;
+
+protected:
+  MMDSLoadTargets() : PaxosServiceMessage(MSG_MDS_OFFLOAD_TARGETS, 0) {}
+  MMDSLoadTargets(mds_gid_t g, std::set<mds_rank_t>& mds_targets) :
+    PaxosServiceMessage(MSG_MDS_OFFLOAD_TARGETS, 0),
+    global_id(g), targets(mds_targets) {}
+  ~MMDSLoadTargets() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mds_load_targets"; }
+  void print(std::ostream& o) const override {
+    o << "mds_load_targets(" << global_id << " " << targets << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(global_id, p);
+    decode(targets, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(global_id, payload);
+    encode(targets, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSMap.h b/src/messages/MMDSMap.h
new file mode 100644
index 000000000..700cd2121
--- /dev/null
+++ b/src/messages/MMDSMap.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMDSMAP_H
+#define CEPH_MMDSMAP_H
+
+#include "msg/Message.h"
+#include "mds/MDSMap.h"
+#include "include/ceph_features.h"
+
+class MMDSMap final : public SafeMessage {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  uuid_d fsid;
+  epoch_t epoch = 0;
+  ceph::buffer::list encoded;
+  // don't really need map_fs_name. it was accidentally added in 51af2346fdf
+  // set it to empty string.
+  std::string map_fs_name = std::string();
+
+  version_t get_epoch() const { return epoch; }
+  const ceph::buffer::list& get_encoded() const { return encoded; }
+
+protected:
+  MMDSMap() : 
+    SafeMessage{CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION} {}
+
+  MMDSMap(const uuid_d &f, const MDSMap &mm) :
+    SafeMessage{CEPH_MSG_MDS_MAP, HEAD_VERSION, COMPAT_VERSION},
+    fsid(f) {
+    epoch = mm.get_epoch();
+    mm.encode(encoded, -1);  // we will reencode with fewer features as necessary
+  }
+
+  ~MMDSMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mdsmap"; }
+  void print(std::ostream& out) const override {
+    out << "mdsmap(e " << epoch << ")";
+  }
+
+  // marshalling
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(epoch, p);
+    decode(encoded, p);
+    if (header.version >= 2) {
+      decode(map_fs_name, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(epoch, payload);
+    if ((features & CEPH_FEATURE_PGID64) == 0 ||
+	(features & CEPH_FEATURE_MDSENC) == 0 ||
+	(features & CEPH_FEATURE_MSG_ADDR2) == 0 ||
+	!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      // reencode for old clients.
+      MDSMap m;
+      m.decode(encoded);
+      encoded.clear();
+      m.encode(encoded, features);
+    }
+    encode(encoded, payload);
+    encode(map_fs_name, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSMetrics.h b/src/messages/MMDSMetrics.h
new file mode 100644
index 000000000..4a8e036eb
--- /dev/null
+++ b/src/messages/MMDSMetrics.h
@@ -0,0 +1,55 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MDS_METRICS_H
+#define CEPH_MDS_METRICS_H
+
+#include "messages/MMDSOp.h"
+#include "mds/MDSPerfMetricTypes.h"
+
+class MMDSMetrics final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  // metrics messsage (client -> metrics map, rank, etc..)
+  metrics_message_t metrics_message;
+
+protected:
+  MMDSMetrics() : MMDSOp(MSG_MDS_METRICS, HEAD_VERSION, COMPAT_VERSION) {
+  }
+  MMDSMetrics(metrics_message_t metrics_message)
+    : MMDSOp(MSG_MDS_METRICS, HEAD_VERSION, COMPAT_VERSION),
+      metrics_message(metrics_message) {
+  }
+  ~MMDSMetrics() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "mds_metrics";
+  }
+
+  void print(std::ostream &out) const override {
+    out << "mds_metrics from rank=" << metrics_message.rank << " carrying "
+        << metrics_message.client_metrics_map.size() << " metric updates";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(metrics_message, payload, features);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto iter = payload.cbegin();
+    decode(metrics_message, iter);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif // CEPH_MDS_METRICS_H
diff --git a/src/messages/MMDSOp.h b/src/messages/MMDSOp.h
new file mode 100644
index 000000000..53a67ea85
--- /dev/null
+++ b/src/messages/MMDSOp.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "msg/Message.h"
+
+/*
+ * MMDSOp is used to ensure that all incoming MDS-MDS
+ * messages in MDSRankDispatcher are versioned. Therefore
+ * all MDS-MDS messages must be of type MMDSOp.
+ */
+class MMDSOp : public SafeMessage {
+public:
+  template<typename... Types>
+  MMDSOp(Types&&... args)
+    : SafeMessage(std::forward<Types>(args)...) {}
+};
diff --git a/src/messages/MMDSOpenIno.h b/src/messages/MMDSOpenIno.h
new file mode 100644
index 000000000..842ebe1e5
--- /dev/null
+++ b/src/messages/MMDSOpenIno.h
@@ -0,0 +1,61 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MDSOPENINO_H
+#define CEPH_MDSOPENINO_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSOpenIno final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  inodeno_t ino;
+  std::vector<inode_backpointer_t> ancestors;
+
+protected:
+  MMDSOpenIno() : MMDSOp{MSG_MDS_OPENINO, HEAD_VERSION, COMPAT_VERSION} {}
+  MMDSOpenIno(ceph_tid_t t, inodeno_t i, std::vector<inode_backpointer_t>* pa) :
+    MMDSOp{MSG_MDS_OPENINO, HEAD_VERSION, COMPAT_VERSION}, ino(i) {
+    header.tid = t;
+    if (pa)
+      ancestors = *pa;
+  }
+  ~MMDSOpenIno() final {}
+
+public:
+  std::string_view get_type_name() const override { return "openino"; }
+  void print(std::ostream &out) const override {
+    out << "openino(" << header.tid << " " << ino << " " << ancestors << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(ancestors, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(ancestors, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSOpenInoReply.h b/src/messages/MMDSOpenInoReply.h
new file mode 100644
index 000000000..25a2ea279
--- /dev/null
+++ b/src/messages/MMDSOpenInoReply.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MDSOPENINOREPLY_H
+#define CEPH_MDSOPENINOREPLY_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSOpenInoReply final : public MMDSOp {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+  inodeno_t ino;
+  std::vector<inode_backpointer_t> ancestors;
+  mds_rank_t hint;
+  int32_t error;
+
+protected:
+  MMDSOpenInoReply() : MMDSOp{MSG_MDS_OPENINOREPLY, HEAD_VERSION, COMPAT_VERSION}, error(0) {}
+  MMDSOpenInoReply(ceph_tid_t t, inodeno_t i, mds_rank_t h=MDS_RANK_NONE, int e=0) :
+    MMDSOp{MSG_MDS_OPENINOREPLY, HEAD_VERSION, COMPAT_VERSION}, ino(i), hint(h), error(e) {
+    header.tid = t;
+  }
+
+
+public:
+  std::string_view get_type_name() const override { return "openinoreply"; }
+  void print(std::ostream &out) const override {
+    out << "openinoreply(" << header.tid << " "
+	<< ino << " " << hint << " " << ancestors << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(ancestors, payload);
+    encode(hint, payload);
+    encode(error, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(ancestors, p);
+    decode(hint, p);
+    decode(error, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSPeerRequest.h b/src/messages/MMDSPeerRequest.h
new file mode 100644
index 000000000..1799ab361
--- /dev/null
+++ b/src/messages/MMDSPeerRequest.h
@@ -0,0 +1,235 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MMDSPEERREQUEST_H
+#define CEPH_MMDSPEERREQUEST_H
+
+#include "mds/mdstypes.h"
+#include "messages/MMDSOp.h"
+
+class MMDSPeerRequest final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  static constexpr int OP_XLOCK =       1;
+  static constexpr int OP_XLOCKACK =   -1;
+  static constexpr int OP_UNXLOCK =     2;
+  static constexpr int OP_AUTHPIN =     3;
+  static constexpr int OP_AUTHPINACK = -3;
+
+  static constexpr int OP_LINKPREP =     4;
+  static constexpr int OP_UNLINKPREP =   5;
+  static constexpr int OP_LINKPREPACK = -4;
+
+  static constexpr int OP_RENAMEPREP =     7;
+  static constexpr int OP_RENAMEPREPACK = -7;
+
+  static constexpr int OP_WRLOCK = 8;
+  static constexpr int OP_WRLOCKACK = -8;
+  static constexpr int OP_UNWRLOCK = 9;
+
+  static constexpr int OP_RMDIRPREP = 10;
+  static constexpr int OP_RMDIRPREPACK = -10;
+
+  static constexpr int OP_DROPLOCKS	= 11;
+
+  static constexpr int OP_RENAMENOTIFY = 12;
+  static constexpr int OP_RENAMENOTIFYACK = -12;
+
+  static constexpr int OP_FINISH = 17;
+  static constexpr int OP_COMMITTED = -18;
+
+  static constexpr int OP_ABORT =  20;  // used for recovery only
+  //static constexpr int OP_COMMIT = 21;  // used for recovery only
+
+
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_XLOCK: return "xlock";
+    case OP_XLOCKACK: return "xlock_ack";
+    case OP_UNXLOCK: return "unxlock";
+    case OP_AUTHPIN: return "authpin";
+    case OP_AUTHPINACK: return "authpin_ack";
+
+    case OP_LINKPREP: return "link_prep";
+    case OP_LINKPREPACK: return "link_prep_ack";
+    case OP_UNLINKPREP: return "unlink_prep";
+
+    case OP_RENAMEPREP: return "rename_prep";
+    case OP_RENAMEPREPACK: return "rename_prep_ack";
+
+    case OP_FINISH: return "finish"; // commit
+    case OP_COMMITTED: return "committed";
+
+    case OP_WRLOCK: return "wrlock";
+    case OP_WRLOCKACK: return "wrlock_ack";
+    case OP_UNWRLOCK: return "unwrlock";
+
+    case OP_RMDIRPREP: return "rmdir_prep";
+    case OP_RMDIRPREPACK: return "rmdir_prep_ack";
+
+    case OP_DROPLOCKS: return "drop_locks";
+
+    case OP_RENAMENOTIFY: return "rename_notify";
+    case OP_RENAMENOTIFYACK: return "rename_notify_ack";
+
+    case OP_ABORT: return "abort";
+      //case OP_COMMIT: return "commit";
+
+    default: ceph_abort(); return 0;
+    }
+  }
+
+ private:
+  metareqid_t reqid;
+  __u32 attempt;
+  __s16 op;
+  mutable __u16 flags; /* XXX HACK for mark_interrupted */
+
+  static constexpr unsigned FLAG_NONBLOCKING	= 1<<0;
+  static constexpr unsigned FLAG_WOULDBLOCK	= 1<<1;
+  static constexpr unsigned FLAG_NOTJOURNALED	= 1<<2;
+  static constexpr unsigned FLAG_EROFS		= 1<<3;
+  static constexpr unsigned FLAG_ABORT		= 1<<4;
+  static constexpr unsigned FLAG_INTERRUPTED	= 1<<5;
+  static constexpr unsigned FLAG_NOTIFYBLOCKING	= 1<<6;
+  static constexpr unsigned FLAG_REQBLOCKED	= 1<<7;
+
+  // for locking
+  __u16 lock_type;  // lock object type
+  MDSCacheObjectInfo object_info;
+
+  // for authpins
+  std::vector<MDSCacheObjectInfo> authpins;
+
+ public:
+  // for rename prep
+  filepath srcdnpath;
+  filepath destdnpath;
+  std::string alternate_name;
+  std::set<mds_rank_t> witnesses;
+  ceph::buffer::list inode_export;
+  version_t inode_export_v;
+  mds_rank_t srcdn_auth;
+  utime_t op_stamp;
+
+  mutable ceph::buffer::list straybl;  // stray dir + dentry
+  ceph::buffer::list srci_snapbl;
+  ceph::buffer::list desti_snapbl;
+
+public:
+  metareqid_t get_reqid() const { return reqid; }
+  __u32 get_attempt() const { return attempt; }
+  int get_op() const { return op; }
+  bool is_reply() const { return op < 0; }
+
+  int get_lock_type() const { return lock_type; }
+  const MDSCacheObjectInfo &get_object_info() const { return object_info; }
+  MDSCacheObjectInfo &get_object_info() { return object_info; }
+  const MDSCacheObjectInfo &get_authpin_freeze() const { return object_info; }
+  MDSCacheObjectInfo &get_authpin_freeze() { return object_info; }
+
+  const std::vector<MDSCacheObjectInfo>& get_authpins() const { return authpins; }
+  std::vector<MDSCacheObjectInfo>& get_authpins() { return authpins; }
+  void mark_nonblocking() { flags |= FLAG_NONBLOCKING; }
+  bool is_nonblocking() const { return (flags & FLAG_NONBLOCKING); }
+  void mark_error_wouldblock() { flags |= FLAG_WOULDBLOCK; }
+  bool is_error_wouldblock() const { return (flags & FLAG_WOULDBLOCK); }
+  void mark_not_journaled() { flags |= FLAG_NOTJOURNALED; }
+  bool is_not_journaled() const { return (flags & FLAG_NOTJOURNALED); }
+  void mark_error_rofs() { flags |= FLAG_EROFS; }
+  bool is_error_rofs() const { return (flags & FLAG_EROFS); }
+  bool is_abort() const { return (flags & FLAG_ABORT); }
+  void mark_abort() { flags |= FLAG_ABORT; }
+  bool is_interrupted() const { return (flags & FLAG_INTERRUPTED); }
+  void mark_interrupted() const { flags |= FLAG_INTERRUPTED; }
+  bool should_notify_blocking() const { return (flags & FLAG_NOTIFYBLOCKING); }
+  void mark_notify_blocking() { flags |= FLAG_NOTIFYBLOCKING; }
+  void clear_notify_blocking() const { flags &= ~FLAG_NOTIFYBLOCKING; }
+  bool is_req_blocked() const { return (flags & FLAG_REQBLOCKED); }
+  void mark_req_blocked() { flags |= FLAG_REQBLOCKED; }
+
+  void set_lock_type(int t) { lock_type = t; }
+  const ceph::buffer::list& get_lock_data() const { return inode_export; }
+  ceph::buffer::list& get_lock_data() { return inode_export; }
+
+protected:
+  MMDSPeerRequest() : MMDSOp{MSG_MDS_PEER_REQUEST, HEAD_VERSION, COMPAT_VERSION} { }
+  MMDSPeerRequest(metareqid_t ri, __u32 att, int o) :
+    MMDSOp{MSG_MDS_PEER_REQUEST, HEAD_VERSION, COMPAT_VERSION},
+    reqid(ri), attempt(att), op(o), flags(0), lock_type(0),
+    inode_export_v(0), srcdn_auth(MDS_RANK_NONE) { }
+  ~MMDSPeerRequest() final {}
+
+public:
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(reqid, payload);
+    encode(attempt, payload);
+    encode(op, payload);
+    encode(flags, payload);
+    encode(lock_type, payload);
+    encode(object_info, payload);
+    encode(authpins, payload);
+    encode(srcdnpath, payload);
+    encode(destdnpath, payload);
+    encode(witnesses, payload);
+    encode(op_stamp, payload);
+    encode(inode_export, payload);
+    encode(inode_export_v, payload);
+    encode(srcdn_auth, payload);
+    encode(straybl, payload);
+    encode(srci_snapbl, payload);
+    encode(desti_snapbl, payload);
+    encode(alternate_name, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(reqid, p);
+    decode(attempt, p);
+    decode(op, p);
+    decode(flags, p);
+    decode(lock_type, p);
+    decode(object_info, p);
+    decode(authpins, p);
+    decode(srcdnpath, p);
+    decode(destdnpath, p);
+    decode(witnesses, p);
+    decode(op_stamp, p);
+    decode(inode_export, p);
+    decode(inode_export_v, p);
+    decode(srcdn_auth, p);
+    decode(straybl, p);
+    decode(srci_snapbl, p);
+    decode(desti_snapbl, p);
+    decode(alternate_name, p);
+  }
+
+  std::string_view get_type_name() const override { return "peer_request"; }
+  void print(std::ostream& out) const override {
+    out << "peer_request(" << reqid
+	<< "." << attempt
+	<< " " << get_opname(op)
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSPing.h b/src/messages/MMDSPing.h
new file mode 100644
index 000000000..586ca91c1
--- /dev/null
+++ b/src/messages/MMDSPing.h
@@ -0,0 +1,52 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MESSAGES_MMDSPING_H
+#define CEPH_MESSAGES_MMDSPING_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+class MMDSPing final : public MMDSOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  version_t seq;
+
+protected:
+  MMDSPing() : MMDSOp(MSG_MDS_PING, HEAD_VERSION, COMPAT_VERSION) {
+  }
+  MMDSPing(version_t seq)
+    : MMDSOp(MSG_MDS_PING, HEAD_VERSION, COMPAT_VERSION), seq(seq) {
+  }
+  ~MMDSPing() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "mdsping";
+  }
+
+  void print(std::ostream &out) const override {
+    out << "mdsping";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(seq, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto iter = payload.cbegin();
+    decode(seq, iter);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif // CEPH_MESSAGES_MMDSPING_H
diff --git a/src/messages/MMDSResolve.h b/src/messages/MMDSResolve.h
new file mode 100644
index 000000000..7b4f7c123
--- /dev/null
+++ b/src/messages/MMDSResolve.h
@@ -0,0 +1,162 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSRESOLVE_H
+#define CEPH_MMDSRESOLVE_H
+
+#include "include/types.h"
+#include "mds/Capability.h"
+#include "messages/MMDSOp.h"
+
+class MMDSResolve final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  std::map<dirfrag_t, std::vector<dirfrag_t>> subtrees;
+  std::map<dirfrag_t, std::vector<dirfrag_t>> ambiguous_imports;
+
+  class peer_inode_cap {
+  public:
+    inodeno_t ino;
+    std::map<client_t,Capability::Export> cap_exports;
+    peer_inode_cap() {}
+    peer_inode_cap(inodeno_t a, std::map<client_t, Capability::Export> b) : ino(a), cap_exports(b) {}
+    void encode(ceph::buffer::list &bl) const 
+    {
+      ENCODE_START(1, 1, bl);
+      encode(ino, bl);
+      encode(cap_exports, bl);
+      ENCODE_FINISH(bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &blp)
+    {
+      DECODE_START(1, blp);
+      decode(ino, blp);
+      decode(cap_exports, blp);
+      DECODE_FINISH(blp);
+    }
+  };
+  WRITE_CLASS_ENCODER(peer_inode_cap)
+
+  struct peer_request {
+    ceph::buffer::list inode_caps;
+    bool committing;
+    peer_request() : committing(false) {}
+    void encode(ceph::buffer::list &bl) const {
+      ENCODE_START(1, 1, bl);
+      encode(inode_caps, bl);
+      encode(committing, bl);
+      ENCODE_FINISH(bl);
+    }
+    void decode(ceph::buffer::list::const_iterator &blp) {
+      DECODE_START(1, blp);
+      decode(inode_caps, blp);
+      decode(committing, blp);
+      DECODE_FINISH(blp);
+    }
+  };
+
+  std::map<metareqid_t, peer_request> peer_requests;
+
+  // table client information
+  struct table_client {
+    __u8 type;
+    std::set<version_t> pending_commits;
+
+    table_client() : type(0) {}
+    table_client(int _type, const std::set<version_t>& commits)
+      : type(_type), pending_commits(commits) {}
+
+    void encode(ceph::buffer::list& bl) const {
+      using ceph::encode;
+      encode(type, bl);
+      encode(pending_commits, bl);
+    }
+    void decode(ceph::buffer::list::const_iterator& bl) {
+      using ceph::decode;
+      decode(type, bl);
+      decode(pending_commits, bl);
+    }
+  };
+
+  std::list<table_client> table_clients;
+
+protected:
+  MMDSResolve() : MMDSOp{MSG_MDS_RESOLVE, HEAD_VERSION, COMPAT_VERSION}
+ {}
+  ~MMDSResolve() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mds_resolve"; }
+
+  void print(std::ostream& out) const override {
+    out << "mds_resolve(" << subtrees.size()
+	<< "+" << ambiguous_imports.size()
+	<< " subtrees +" << peer_requests.size() << " peer requests)";
+  }
+  
+  void add_subtree(dirfrag_t im) {
+    subtrees[im].clear();
+  }
+  void add_subtree_bound(dirfrag_t im, dirfrag_t ex) {
+    subtrees[im].push_back(ex);
+  }
+
+  void add_ambiguous_import(dirfrag_t im, const std::vector<dirfrag_t>& m) {
+    ambiguous_imports[im] = m;
+  }
+
+  void add_peer_request(metareqid_t reqid, bool committing) {
+    peer_requests[reqid].committing = committing;
+  }
+
+  void add_peer_request(metareqid_t reqid, ceph::buffer::list& bl) {
+    peer_requests[reqid].inode_caps = std::move(bl);
+  }
+
+  void add_table_commits(int table, const std::set<version_t>& pending_commits) {
+    table_clients.push_back(table_client(table, pending_commits));
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(subtrees, payload);
+    encode(ambiguous_imports, payload);
+    encode(peer_requests, payload);
+    encode(table_clients, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(subtrees, p);
+    decode(ambiguous_imports, p);
+    decode(peer_requests, p);
+    decode(table_clients, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+inline std::ostream& operator<<(std::ostream& out, const MMDSResolve::peer_request&) {
+    return out;
+}
+
+WRITE_CLASS_ENCODER(MMDSResolve::peer_request)
+WRITE_CLASS_ENCODER(MMDSResolve::table_client)
+WRITE_CLASS_ENCODER(MMDSResolve::peer_inode_cap)
+#endif
diff --git a/src/messages/MMDSResolveAck.h b/src/messages/MMDSResolveAck.h
new file mode 100644
index 000000000..0b459aaef
--- /dev/null
+++ b/src/messages/MMDSResolveAck.h
@@ -0,0 +1,67 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMDSRESOLVEACK_H
+#define CEPH_MMDSRESOLVEACK_H
+
+#include "include/types.h"
+#include "messages/MMDSOp.h"
+
+
+class MMDSResolveAck final : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  std::map<metareqid_t, ceph::buffer::list> commit;
+  std::vector<metareqid_t> abort;
+
+protected:
+  MMDSResolveAck() : MMDSOp{MSG_MDS_RESOLVEACK, HEAD_VERSION, COMPAT_VERSION} {}
+  ~MMDSResolveAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "resolve_ack"; }
+  /*void print(ostream& out) const {
+    out << "resolve_ack.size()
+	<< "+" << ambiguous_imap.size()
+	<< " imports +" << peer_requests.size() << " peer requests)";
+  }
+  */
+  
+  void add_commit(metareqid_t r) {
+    commit[r].clear();
+  }
+  void add_abort(metareqid_t r) {
+    abort.push_back(r);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(commit, payload);
+    encode(abort, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(commit, p);
+    decode(abort, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSScrub.h b/src/messages/MMDSScrub.h
new file mode 100644
index 000000000..a1bf2b54f
--- /dev/null
+++ b/src/messages/MMDSScrub.h
@@ -0,0 +1,140 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMDSSCRUB_H
+#define CEPH_MMDSSCRUB_H
+
+#include "messages/MMDSOp.h"
+
+#include "include/types.h"
+#include "include/frag.h"
+
+class MMDSScrub : public MMDSOp {
+public:
+  static constexpr int OP_QUEUEDIR	= 1;
+  static constexpr int OP_QUEUEDIR_ACK	= -1;
+  static constexpr int OP_QUEUEINO	= 2;
+  static constexpr int OP_QUEUEINO_ACK 	= -2;
+  static constexpr int OP_ABORT		= 3;
+  static constexpr int OP_PAUSE		= 4;
+  static constexpr int OP_RESUME	= 5;
+
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_QUEUEDIR: return "queue_dir";
+    case OP_QUEUEDIR_ACK: return "queue_dir_ack";
+    case OP_QUEUEINO: return "queue_ino";
+    case OP_QUEUEINO_ACK: return "queue_ino_ack";
+    case OP_ABORT: return "abort";
+    case OP_PAUSE: return "pause";
+    case OP_RESUME: return "resume";
+    default: ceph_abort(); return nullptr;
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mds_scrub"; }
+
+  void print(std::ostream& out) const override {
+    out << "mds_scrub(" << get_opname(op) << " "
+	<< ino << " " << frags << " " << tag;
+    if (is_force()) out << " force";
+    if (is_recursive()) out << " recursive";
+    if (is_repair()) out << " repair";
+    out << ")";
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(ino, payload);
+    encode(frags, payload);
+    encode(tag, payload);
+    encode(origin, payload);
+    encode(flags, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(ino, p);
+    decode(frags, p);
+    decode(tag, p);
+    decode(origin, p);
+    decode(flags, p);
+  }
+  inodeno_t get_ino() const {
+    return ino;
+  }
+  const fragset_t& get_frags() const {
+    return frags;
+  }
+  const std::string& get_tag() const {
+    return tag;
+  }
+  inodeno_t get_origin() const {
+    return origin;
+  }
+  int get_op() const {
+    return op;
+  }
+  bool is_internal_tag() const {
+    return flags & FLAG_INTERNAL_TAG;
+  }
+  bool is_force() const {
+    return flags & FLAG_FORCE;
+  }
+  bool is_recursive() const {
+    return flags & FLAG_RECURSIVE;
+  }
+  bool is_repair() const {
+    return flags & FLAG_REPAIR;
+  }
+
+protected:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  MMDSScrub() : MMDSOp(MSG_MDS_SCRUB, HEAD_VERSION, COMPAT_VERSION) {}
+  MMDSScrub(int o)
+    : MMDSOp(MSG_MDS_SCRUB, HEAD_VERSION, COMPAT_VERSION), op(o) {}
+  MMDSScrub(int o, inodeno_t i, fragset_t&& _frags, std::string_view _tag,
+	    inodeno_t _origin=inodeno_t(), bool internal_tag=false,
+	    bool force=false, bool recursive=false, bool repair=false)
+    : MMDSOp(MSG_MDS_SCRUB, HEAD_VERSION, COMPAT_VERSION),
+    op(o), ino(i), frags(std::move(_frags)), tag(_tag), origin(_origin) {
+    if (internal_tag) flags |= FLAG_INTERNAL_TAG;
+    if (force) flags |= FLAG_FORCE;
+    if (recursive) flags |= FLAG_RECURSIVE;
+    if (repair) flags |= FLAG_REPAIR;
+  }
+
+  ~MMDSScrub() override {}
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+
+  static constexpr unsigned FLAG_INTERNAL_TAG	= 1<<0;
+  static constexpr unsigned FLAG_FORCE		= 1<<1;
+  static constexpr unsigned FLAG_RECURSIVE	= 1<<2;
+  static constexpr unsigned FLAG_REPAIR		= 1<<3;
+
+  int op;
+  inodeno_t ino;
+  fragset_t frags;
+  std::string tag;
+  inodeno_t origin;
+  unsigned flags = 0;
+};
+#endif // CEPH_MMDSSCRUB_H
diff --git a/src/messages/MMDSScrubStats.h b/src/messages/MMDSScrubStats.h
new file mode 100644
index 000000000..c60981be5
--- /dev/null
+++ b/src/messages/MMDSScrubStats.h
@@ -0,0 +1,82 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMDSSCRUBSTATS_H
+#define CEPH_MMDSSCRUBSTATS_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSScrubStats : public MMDSOp {
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  std::string_view get_type_name() const override { return "mds_scrub_stats"; }
+  void print(std::ostream& o) const override {
+    o << "mds_scrub_stats(e" << epoch;
+    if (update_scrubbing)
+      o << " [" << scrubbing_tags << "]";
+    if (aborting)
+      o << " aborting";
+    o << ")";
+  }
+
+  unsigned get_epoch() const { return epoch; }
+  const auto& get_scrubbing_tags() const { return scrubbing_tags; }
+  bool is_aborting() const { return aborting; }
+  bool is_finished(const std::string& tag) const {
+    return update_scrubbing && !scrubbing_tags.count(tag);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(scrubbing_tags, payload);
+    encode(update_scrubbing, payload);
+    encode(aborting, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(scrubbing_tags, p);
+    decode(update_scrubbing, p);
+    decode(aborting, p);
+  }
+
+protected:
+  MMDSScrubStats(unsigned e=0) :
+    MMDSOp(MSG_MDS_SCRUB_STATS, HEAD_VERSION, COMPAT_VERSION),
+    epoch(e) {}
+  MMDSScrubStats(unsigned e, std::set<std::string>&& tags, bool abrt=false) :
+    MMDSOp(MSG_MDS_SCRUB_STATS, HEAD_VERSION, COMPAT_VERSION),
+    epoch(e), scrubbing_tags(std::move(tags)), update_scrubbing(true), aborting(abrt) {}
+  MMDSScrubStats(unsigned e, const std::set<std::string>& tags, bool abrt=false) :
+    MMDSOp(MSG_MDS_SCRUB_STATS, HEAD_VERSION, COMPAT_VERSION),
+    epoch(e), scrubbing_tags(tags), update_scrubbing(true), aborting(abrt) {}
+  ~MMDSScrubStats() override {}
+
+private:
+  unsigned epoch;
+  std::set<std::string> scrubbing_tags;
+  bool update_scrubbing = false;
+  bool aborting = false;
+
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSSnapUpdate.h b/src/messages/MMDSSnapUpdate.h
new file mode 100644
index 000000000..91ff42c42
--- /dev/null
+++ b/src/messages/MMDSSnapUpdate.h
@@ -0,0 +1,65 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMDSSNAPUPDATE_H
+#define CEPH_MMDSSNAPUPDATE_H
+
+#include "messages/MMDSOp.h"
+
+class MMDSSnapUpdate final : public MMDSOp {
+private:
+  inodeno_t ino;
+  __s16 snap_op;
+
+public:
+  inodeno_t get_ino() const { return ino; }
+  int get_snap_op() const { return snap_op; }
+
+  ceph::buffer::list snap_blob;
+
+protected:
+  MMDSSnapUpdate() : MMDSOp{MSG_MDS_SNAPUPDATE} {}
+  MMDSSnapUpdate(inodeno_t i, version_t tid, int op) :
+    MMDSOp{MSG_MDS_SNAPUPDATE}, ino(i), snap_op(op) {
+      set_tid(tid);
+    }
+  ~MMDSSnapUpdate() final {}
+
+public:
+  std::string_view get_type_name() const override { return "snap_update"; }
+  void print(std::ostream& o) const override {
+    o << "snap_update(" << ino << " table_tid " << get_tid() << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(ino, payload);
+    encode(snap_op, payload);
+    encode(snap_blob, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(ino, p);
+    decode(snap_op, p);
+    decode(snap_blob, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMDSTableRequest.h b/src/messages/MMDSTableRequest.h
new file mode 100644
index 000000000..df7722f21
--- /dev/null
+++ b/src/messages/MMDSTableRequest.h
@@ -0,0 +1,72 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMDSTABLEREQUEST_H
+#define CEPH_MMDSTABLEREQUEST_H
+
+#include "mds/mds_table_types.h"
+#include "messages/MMDSOp.h"
+
+class MMDSTableRequest final : public MMDSOp {
+public:
+  __u16 table = 0;
+  __s16 op = 0;
+  uint64_t reqid = 0;
+  ceph::buffer::list bl;
+
+protected:
+  MMDSTableRequest() : MMDSOp{MSG_MDS_TABLE_REQUEST} {}
+  MMDSTableRequest(int tab, int o, uint64_t r, version_t v=0) : 
+    MMDSOp{MSG_MDS_TABLE_REQUEST},
+    table(tab), op(o), reqid(r) {
+    set_tid(v);
+  }
+  ~MMDSTableRequest() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mds_table_request"; }
+  void print(std::ostream& o) const override {
+    o << "mds_table_request(" << get_mdstable_name(table)
+      << " " << get_mdstableserver_opname(op);
+    if (reqid) o << " " << reqid;
+    if (get_tid()) o << " tid " << get_tid();
+    if (bl.length()) o << " " << bl.length() << " bytes";
+    o << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(table, p);
+    decode(op, p);
+    decode(reqid, p);
+    decode(bl, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(table, payload);
+    encode(op, payload);
+    encode(reqid, payload);
+    encode(bl, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMgrBeacon.h b/src/messages/MMgrBeacon.h
new file mode 100644
index 000000000..1799e2f71
--- /dev/null
+++ b/src/messages/MMgrBeacon.h
@@ -0,0 +1,210 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMGRBEACON_H
+#define CEPH_MMGRBEACON_H
+
+#include "messages/PaxosServiceMessage.h"
+#include "mon/MonCommand.h"
+#include "mon/MgrMap.h"
+
+#include "include/types.h"
+
+
+class MMgrBeacon final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 11;
+  static constexpr int COMPAT_VERSION = 8;
+
+protected:
+  uint64_t gid;
+  entity_addrvec_t server_addrs;
+  bool available;
+  std::string name;
+  uuid_d fsid;
+
+  // From active daemon to populate MgrMap::services
+  std::map<std::string, std::string> services;
+
+  // Only populated during activation
+  std::vector<MonCommand> command_descs;
+
+  // Information about the modules found locally on this daemon
+  std::vector<MgrMap::ModuleInfo> modules;
+
+  std::map<std::string,std::string> metadata; ///< misc metadata about this osd
+
+  std::multimap<std::string, entity_addrvec_t> clients;
+
+  uint64_t mgr_features = 0;   ///< reporting mgr's features
+
+public:
+  MMgrBeacon()
+    : PaxosServiceMessage{MSG_MGR_BEACON, 0, HEAD_VERSION, COMPAT_VERSION},
+      gid(0), available(false)
+  {}
+
+  MMgrBeacon(const uuid_d& fsid_, uint64_t gid_, const std::string &name_,
+             entity_addrvec_t server_addrs_, bool available_,
+	     std::vector<MgrMap::ModuleInfo>&& modules_,
+	     std::map<std::string,std::string>&& metadata_,
+             std::multimap<std::string, entity_addrvec_t>&& clients_,
+	     uint64_t feat)
+    : PaxosServiceMessage{MSG_MGR_BEACON, 0, HEAD_VERSION, COMPAT_VERSION},
+      gid(gid_), server_addrs(server_addrs_), available(available_), name(name_),
+      fsid(fsid_), modules(std::move(modules_)), metadata(std::move(metadata_)),
+      clients(std::move(clients_)),
+      mgr_features(feat)
+  {
+  }
+
+  uint64_t get_gid() const { return gid; }
+  entity_addrvec_t get_server_addrs() const { return server_addrs; }
+  bool get_available() const { return available; }
+  const std::string& get_name() const { return name; }
+  const uuid_d& get_fsid() const { return fsid; }
+  const std::map<std::string,std::string>& get_metadata() const {
+    return metadata;
+  }
+  const std::map<std::string,std::string>& get_services() const {
+    return services;
+  }
+  uint64_t get_mgr_features() const { return mgr_features; }
+
+  void set_services(const std::map<std::string, std::string> &svcs)
+  {
+    services = svcs;
+  }
+
+  void set_command_descs(const std::vector<MonCommand> &cmds)
+  {
+    command_descs = cmds;
+  }
+
+  const std::vector<MonCommand> &get_command_descs()
+  {
+    return command_descs;
+  }
+
+  const std::vector<MgrMap::ModuleInfo> &get_available_modules() const
+  {
+    return modules;
+  }
+
+  const auto& get_clients() const
+  {
+    return clients;
+  }
+
+private:
+  ~MMgrBeacon() final {}
+
+public:
+
+  std::string_view get_type_name() const override { return "mgrbeacon"; }
+
+  void print(std::ostream& out) const override {
+    out << get_type_name() << " mgr." << name << "(" << fsid << ","
+	<< gid << ", " << server_addrs << ", " << available
+	<< ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    using ceph::encode;
+    paxos_encode();
+
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    encode(server_addrs, payload, features);
+    encode(gid, payload);
+    encode(available, payload);
+    encode(name, payload);
+    encode(fsid, payload);
+
+    // Fill out old-style list of module names (deprecated by
+    // later field of full ModuleInfos)
+    std::set<std::string> module_names;
+    for (const auto &info : modules) {
+      module_names.insert(info.name);
+    }
+    encode(module_names, payload);
+
+    encode(command_descs, payload);
+    encode(metadata, payload);
+    encode(services, payload);
+
+    encode(modules, payload);
+    encode(mgr_features, payload);
+
+    std::vector<std::string> clients_names;
+    std::vector<entity_addrvec_t> clients_addrs;
+    for (const auto& i : clients) {
+      clients_names.push_back(i.first);
+      clients_addrs.push_back(i.second);
+    }
+    // The address vector needs to be encoded first to produce a
+    // backwards compatible messsage for older monitors.
+    encode(clients_addrs, payload, features);
+    encode(clients_names, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    assert(header.version >= 8);
+    decode(server_addrs, p);  // entity_addr_t for version < 8
+    decode(gid, p);
+    decode(available, p);
+    decode(name, p);
+    decode(fsid, p);
+    std::set<std::string> module_name_list;
+    decode(module_name_list, p);
+    decode(command_descs, p);
+    decode(metadata, p);
+    decode(services, p);
+    decode(modules, p);
+    if (header.version >= 9) {
+      decode(mgr_features, p);
+    }
+    if (header.version >= 10) {
+      std::vector<entity_addrvec_t> clients_addrs;
+      decode(clients_addrs, p);
+      clients.clear();
+      if (header.version >= 11) {
+	std::vector<std::string> clients_names;
+	decode(clients_names, p);
+	if (clients_names.size() != clients_addrs.size()) {
+	  throw ceph::buffer::malformed_input(
+	    "clients_names.size() != clients_addrs.size()");
+	}
+	auto cn = clients_names.begin();
+	auto ca = clients_addrs.begin();
+	for(; cn != clients_names.end(); ++cn, ++ca) {
+	  clients.emplace(*cn, *ca);
+	}
+      } else {
+	for (const auto& i : clients_addrs) {
+	  clients.emplace("", i);
+	}
+      }
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+
+#endif
diff --git a/src/messages/MMgrClose.h b/src/messages/MMgrClose.h
new file mode 100644
index 000000000..680ce273c
--- /dev/null
+++ b/src/messages/MMgrClose.h
@@ -0,0 +1,51 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+
+class MMgrClose : public Message {
+private:
+
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  std::string daemon_name;
+  std::string service_name;  // optional; otherwise infer from entity type
+
+  void decode_payload() override
+  {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(daemon_name, p);
+    decode(service_name, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(daemon_name, payload);
+    encode(service_name, payload);
+  }
+
+  std::string_view get_type_name() const override { return "mgrclose"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(";
+    if (service_name.length()) {
+      out << service_name;
+    } else {
+      out << ceph_entity_type_name(get_source().type());
+    }
+    out << "." << daemon_name;
+    out << ")";
+  }
+
+  MMgrClose()
+    : Message{MSG_MGR_CLOSE, HEAD_VERSION, COMPAT_VERSION}
+  {}
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MMgrCommand.h b/src/messages/MMgrCommand.h
new file mode 100644
index 000000000..83ee618c5
--- /dev/null
+++ b/src/messages/MMgrCommand.h
@@ -0,0 +1,46 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <vector>
+
+#include "msg/Message.h"
+
+class MMgrCommand final : public Message {
+public:
+  uuid_d fsid;
+  std::vector<std::string> cmd;
+
+  MMgrCommand()
+    : Message{MSG_MGR_COMMAND} {}
+  MMgrCommand(const uuid_d &f)
+    : Message{MSG_MGR_COMMAND},
+      fsid(f) { }
+
+private:
+  ~MMgrCommand() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mgr_command"; }
+  void print(std::ostream& o) const override {
+    o << "mgr_command(tid " << get_tid() << ": ";
+    for (unsigned i=0; i<cmd.size(); i++) {
+      if (i) o << ' ';
+      o << cmd[i];
+    }
+    o << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(cmd, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(cmd, p);
+  }
+};
diff --git a/src/messages/MMgrCommandReply.h b/src/messages/MMgrCommandReply.h
new file mode 100644
index 000000000..40b8fd34d
--- /dev/null
+++ b/src/messages/MMgrCommandReply.h
@@ -0,0 +1,45 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <string_view>
+
+#include "msg/Message.h"
+#include "MMgrCommand.h"
+
+class MMgrCommandReply final : public Message {
+public:
+  errorcode32_t r;
+  std::string rs;
+
+  MMgrCommandReply()
+    : Message{MSG_MGR_COMMAND_REPLY} {}
+  MMgrCommandReply(MMgrCommand *m, int _r)
+    : Message{MSG_MGR_COMMAND_REPLY}, r(_r) {
+    header.tid = m->get_tid();
+  }
+  MMgrCommandReply(int _r, std::string_view s)
+    : Message{MSG_MGR_COMMAND_REPLY},
+      r(_r), rs(s) { }
+private:
+  ~MMgrCommandReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mgr_command_reply"; }
+  void print(std::ostream& o) const override {
+    o << "mgr_command_reply(tid " << get_tid() << ": " << r << " " << rs << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(r, payload);
+    encode(rs, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(r, p);
+    decode(rs, p);
+  }
+};
diff --git a/src/messages/MMgrConfigure.h b/src/messages/MMgrConfigure.h
new file mode 100644
index 000000000..ab3a41e37
--- /dev/null
+++ b/src/messages/MMgrConfigure.h
@@ -0,0 +1,89 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MMGRCONFIGURE_H_
+#define CEPH_MMGRCONFIGURE_H_
+
+#include "msg/Message.h"
+#include "mgr/MetricTypes.h"
+#include "mgr/OSDPerfMetricTypes.h"
+
+/**
+ * This message is sent from ceph-mgr to MgrClient, instructing it
+ * it about what data to send back to ceph-mgr at what frequency.
+ */
+class MMgrConfigure : public Message {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  uint32_t stats_period = 0;
+
+  // Default 0 means if unspecified will include all stats
+  uint32_t stats_threshold = 0;
+
+  std::map<OSDPerfMetricQuery, OSDPerfMetricLimits> osd_perf_metric_queries;
+
+  boost::optional<MetricConfigMessage> metric_config_message;
+
+  void decode_payload() override
+  {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(stats_period, p);
+    if (header.version >= 2) {
+      decode(stats_threshold, p);
+    }
+    if (header.version >= 3) {
+      decode(osd_perf_metric_queries, p);
+    }
+    if (header.version >= 4) {
+      decode(metric_config_message, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(stats_period, payload);
+    encode(stats_threshold, payload);
+    encode(osd_perf_metric_queries, payload);
+    if (metric_config_message && metric_config_message->should_encode(features)) {
+      encode(metric_config_message, payload);
+    } else {
+      boost::optional<MetricConfigMessage> empty;
+      encode(empty, payload);
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mgrconfigure"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(period=" << stats_period
+			   << ", threshold=" << stats_threshold << ")";
+  }
+
+private:
+  MMgrConfigure()
+    : Message{MSG_MGR_CONFIGURE, HEAD_VERSION, COMPAT_VERSION}
+  {}
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
+
diff --git a/src/messages/MMgrDigest.h b/src/messages/MMgrDigest.h
new file mode 100644
index 000000000..e9c4b45f6
--- /dev/null
+++ b/src/messages/MMgrDigest.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMGRDIGEST_H
+#define CEPH_MMGRDIGEST_H
+
+#include "msg/Message.h"
+
+/**
+ * The mgr digest is a way for the mgr to subscribe to things
+ * other than the cluster maps, which are needed by 
+ */
+class MMgrDigest final : public Message {
+public:
+  ceph::buffer::list mon_status_json;
+  ceph::buffer::list health_json;
+
+  std::string_view get_type_name() const override { return "mgrdigest"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name();
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(mon_status_json, p);
+    decode(health_json, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(mon_status_json, payload);
+    encode(health_json, payload);
+  }
+
+private:
+  MMgrDigest() :
+    Message{MSG_MGR_DIGEST} {}
+  ~MMgrDigest() final {}
+
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMgrMap.h b/src/messages/MMgrMap.h
new file mode 100644
index 000000000..2026fa3a4
--- /dev/null
+++ b/src/messages/MMgrMap.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMGRMAP_H
+#define CEPH_MMGRMAP_H
+
+#include "msg/Message.h"
+#include "mon/MgrMap.h"
+
+class MMgrMap final : public Message {
+protected:
+  MgrMap map;
+
+public:
+  const MgrMap & get_map() {return map;}
+
+private:
+  MMgrMap() : 
+    Message{MSG_MGR_MAP} {}
+  MMgrMap(const MgrMap &map_) :
+    Message{MSG_MGR_MAP}, map(map_)
+  {}
+  ~MMgrMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mgrmap"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(e " << map.epoch << ")";
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(map, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(map, payload, features);
+  }
+private:
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMgrOpen.h b/src/messages/MMgrOpen.h
new file mode 100644
index 000000000..9c9345e8a
--- /dev/null
+++ b/src/messages/MMgrOpen.h
@@ -0,0 +1,100 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MMGROPEN_H_
+#define CEPH_MMGROPEN_H_
+
+#include "msg/Message.h"
+
+class MMgrOpen : public Message {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+
+  std::string daemon_name;
+  std::string service_name;  // optional; otherwise infer from entity type
+
+  bool service_daemon = false;
+  std::map<std::string,std::string> daemon_metadata;
+  std::map<std::string,std::string> daemon_status;
+
+  // encode map<string,map<int32_t,string>> of current config
+  ceph::buffer::list config_bl;
+
+  // encode map<string,string> of compiled-in defaults
+  ceph::buffer::list config_defaults_bl;
+
+  void decode_payload() override
+  {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(daemon_name, p);
+    if (header.version >= 2) {
+      decode(service_name, p);
+      decode(service_daemon, p);
+      if (service_daemon) {
+	decode(daemon_metadata, p);
+	decode(daemon_status, p);
+      }
+    }
+    if (header.version >= 3) {
+      decode(config_bl, p);
+      decode(config_defaults_bl, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(daemon_name, payload);
+    encode(service_name, payload);
+    encode(service_daemon, payload);
+    if (service_daemon) {
+      encode(daemon_metadata, payload);
+      encode(daemon_status, payload);
+    }
+    encode(config_bl, payload);
+    encode(config_defaults_bl, payload);
+  }
+
+  std::string_view get_type_name() const override { return "mgropen"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(";
+    if (service_name.length()) {
+      out << service_name;
+    } else {
+      out << ceph_entity_type_name(get_source().type());
+    }
+    out << "." << daemon_name;
+    if (service_daemon) {
+      out << " daemon";
+    }
+    out << ")";
+  }
+
+private:
+  MMgrOpen()
+    : Message{MSG_MGR_OPEN, HEAD_VERSION, COMPAT_VERSION}
+  {}
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
+
diff --git a/src/messages/MMgrReport.h b/src/messages/MMgrReport.h
new file mode 100644
index 000000000..bd3c221a8
--- /dev/null
+++ b/src/messages/MMgrReport.h
@@ -0,0 +1,204 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MMGRREPORT_H_
+#define CEPH_MMGRREPORT_H_
+
+#include <boost/optional.hpp>
+
+#include "msg/Message.h"
+#include "mgr/MetricTypes.h"
+#include "mgr/OSDPerfMetricTypes.h"
+
+#include "common/perf_counters.h"
+#include "include/common_fwd.h"
+#include "mgr/DaemonHealthMetric.h"
+
+class PerfCounterType
+{
+public:
+  std::string path;
+  std::string description;
+  std::string nick;
+  enum perfcounter_type_d type;
+
+  // For older clients that did not send priority, pretend everything
+  // is "useful" so that mgr plugins filtering on prio will get some
+  // data (albeit probably more than they wanted)
+  uint8_t priority = PerfCountersBuilder::PRIO_USEFUL;
+  enum unit_t unit;
+
+  void encode(ceph::buffer::list &bl) const
+  {
+    // TODO: decide whether to drop the per-type
+    // encoding here, we could rely on the MgrReport
+    // verisoning instead.
+    ENCODE_START(3, 1, bl);
+    encode(path, bl);
+    encode(description, bl);
+    encode(nick, bl);
+    static_assert(sizeof(type) == 1, "perfcounter_type_d must be one byte");
+    encode((uint8_t)type, bl);
+    encode(priority, bl);
+    encode((uint8_t)unit, bl);
+    ENCODE_FINISH(bl);
+  }
+  
+  void decode(ceph::buffer::list::const_iterator &p)
+  {
+    DECODE_START(3, p);
+    decode(path, p);
+    decode(description, p);
+    decode(nick, p);
+    uint8_t raw_type;
+    decode(raw_type, p);
+    type = (enum perfcounter_type_d)raw_type;
+    if (struct_v >= 2) {
+      decode(priority, p);
+    }
+    if (struct_v >= 3) {
+      uint8_t raw_unit;
+      decode(raw_unit, p);
+      unit = (enum unit_t)raw_unit;
+    }
+    DECODE_FINISH(p);
+  }
+};
+WRITE_CLASS_ENCODER(PerfCounterType)
+
+class MMgrReport : public Message {
+private:
+  static constexpr int HEAD_VERSION = 9;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  /**
+   * Client is responsible for remembering whether it has introduced
+   * each perf counter to the server.  When first sending a particular
+   * counter, it must inline the counter's schema here.
+   */
+  std::vector<PerfCounterType> declare_types;
+  std::vector<std::string> undeclare_types;
+
+  // For all counters present, sorted by idx, output
+  // as many bytes as are needed to represent them
+
+  // Decode: iterate over the types we know about, sorted by idx,
+  // and use the current type's type to decide how to decode
+  // the next bytes from the ceph::buffer::list.
+  ceph::buffer::list packed;
+
+  std::string daemon_name;
+  std::string service_name;  // optional; otherwise infer from entity type
+
+  // for service registration
+  boost::optional<std::map<std::string,std::string>> daemon_status;
+  boost::optional<std::map<std::string,std::string>> task_status;
+
+  std::vector<DaemonHealthMetric> daemon_health_metrics;
+
+  // encode map<string,map<int32_t,string>> of current config
+  ceph::buffer::list config_bl;
+
+  std::map<OSDPerfMetricQuery, OSDPerfMetricReport>  osd_perf_metric_reports;
+
+  boost::optional<MetricReportMessage> metric_report_message;
+
+  void decode_payload() override
+  {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(daemon_name, p);
+    decode(declare_types, p);
+    decode(packed, p);
+    if (header.version >= 2)
+      decode(undeclare_types, p);
+    if (header.version >= 3) {
+      decode(service_name, p);
+      decode(daemon_status, p);
+    }
+    if (header.version >= 5) {
+      decode(daemon_health_metrics, p);
+    }
+    if (header.version >= 6) {
+      decode(config_bl, p);
+    }
+    if (header.version >= 7) {
+      decode(osd_perf_metric_reports, p);
+    }
+    if (header.version >= 8) {
+      decode(task_status, p);
+    }
+    if (header.version >= 9) {
+      decode(metric_report_message, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(daemon_name, payload);
+    encode(declare_types, payload);
+    encode(packed, payload);
+    encode(undeclare_types, payload);
+    encode(service_name, payload);
+    encode(daemon_status, payload);
+    encode(daemon_health_metrics, payload);
+    encode(config_bl, payload);
+    encode(osd_perf_metric_reports, payload);
+    encode(task_status, payload);
+    if (metric_report_message && metric_report_message->should_encode(features)) {
+      encode(metric_report_message, payload);
+    } else {
+      boost::optional<MetricReportMessage> empty;
+      encode(empty, payload);
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mgrreport"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(";
+    if (service_name.length()) {
+      out << service_name;
+    } else {
+      out << ceph_entity_type_name(get_source().type());
+    }
+    out << "." << daemon_name
+	<< " +" << declare_types.size()
+	<< "-" << undeclare_types.size()
+        << " packed " << packed.length();
+    if (daemon_status) {
+      out << " status=" << daemon_status->size();
+    }
+    if (!daemon_health_metrics.empty()) {
+      out << " daemon_metrics=" << daemon_health_metrics.size();
+    }
+    if (task_status) {
+      out << " task_status=" << task_status->size();
+    }
+    out << ")";
+  }
+
+private:
+  MMgrReport()
+    : Message{MSG_MGR_REPORT, HEAD_VERSION, COMPAT_VERSION}
+  {}
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMgrUpdate.h b/src/messages/MMgrUpdate.h
new file mode 100644
index 000000000..5e1f27b5f
--- /dev/null
+++ b/src/messages/MMgrUpdate.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2022 Prashant D <pdhange@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MMGRUPDATE_H_
+#define CEPH_MMGRUPDATE_H_
+
+#include "msg/Message.h"
+
+class MMgrUpdate : public Message {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+
+  std::string daemon_name;
+  std::string service_name;  // optional; otherwise infer from entity type
+
+  std::map<std::string,std::string> daemon_metadata;
+  std::map<std::string,std::string> daemon_status;
+
+  bool need_metadata_update = false;
+
+  void decode_payload() override
+  {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(daemon_name, p);
+    if (header.version >= 2) {
+      decode(service_name, p);
+      decode(need_metadata_update, p);
+      if (need_metadata_update) {
+	decode(daemon_metadata, p);
+	decode(daemon_status, p);
+      }
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(daemon_name, payload);
+    encode(service_name, payload);
+    encode(need_metadata_update, payload);
+    if (need_metadata_update) {
+      encode(daemon_metadata, payload);
+      encode(daemon_status, payload);
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mgrupdate"; }
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(";
+    if (service_name.length()) {
+      out << service_name;
+    } else {
+      out << ceph_entity_type_name(get_source().type());
+    }
+    out << "." << daemon_name;
+    out << ")";
+  }
+
+private:
+  MMgrUpdate()
+    : Message{MSG_MGR_UPDATE, HEAD_VERSION, COMPAT_VERSION}
+  {}
+  using RefCountedObject::put;
+  using RefCountedObject::get;
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
+
diff --git a/src/messages/MMonCommand.h b/src/messages/MMonCommand.h
new file mode 100644
index 000000000..1f1e6728b
--- /dev/null
+++ b/src/messages/MMonCommand.h
@@ -0,0 +1,97 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONCOMMAND_H
+#define CEPH_MMONCOMMAND_H
+
+#include "messages/PaxosServiceMessage.h"
+
+#include <vector>
+#include <string>
+
+using ceph::common::cmdmap_from_json;
+using ceph::common::cmd_getval;
+
+class MMonCommand final : public PaxosServiceMessage {
+public:
+  // weird note: prior to octopus, MgrClient would leave fsid blank when
+  // sending commands to the mgr.  Starting with octopus, this is either
+  // populated with a valid fsid (tell command) or an MMgrCommand is sent
+  // instead.
+  uuid_d fsid;
+  std::vector<std::string> cmd;
+
+  MMonCommand() : PaxosServiceMessage{MSG_MON_COMMAND, 0} {}
+  MMonCommand(const uuid_d &f)
+    : PaxosServiceMessage{MSG_MON_COMMAND, 0},
+      fsid(f)
+  { }
+
+  MMonCommand(const MMonCommand &other)
+    : PaxosServiceMessage(MSG_MON_COMMAND, 0),
+      fsid(other.fsid),
+      cmd(other.cmd) {
+    set_tid(other.get_tid());
+    set_data(other.get_data());
+  }
+
+  ~MMonCommand() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_command"; }
+  void print(std::ostream& o) const override {
+    cmdmap_t cmdmap;
+    std::ostringstream ss;
+    std::string prefix;
+    cmdmap_from_json(cmd, &cmdmap, ss);
+    cmd_getval(cmdmap, "prefix", prefix);
+    // Some config values contain sensitive data, so don't log them
+    o << "mon_command(";
+    if (prefix == "config set") {
+      std::string name;
+      cmd_getval(cmdmap, "name", name);
+      o << "[{prefix=" << prefix << ", name=" << name << "}]";
+    } else if (prefix == "config-key set") {
+      std::string key;
+      cmd_getval(cmdmap, "key", key);
+      o << "[{prefix=" << prefix << ", key=" << key << "}]";
+    } else {
+      for (unsigned i=0; i<cmd.size(); i++) {
+        if (i) o << ' ';
+        o << cmd[i];
+      }
+    }
+    o << " v " << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(cmd, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(cmd, p);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonCommandAck.h b/src/messages/MMonCommandAck.h
new file mode 100644
index 000000000..bf96bcc63
--- /dev/null
+++ b/src/messages/MMonCommandAck.h
@@ -0,0 +1,83 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONCOMMANDACK_H
+#define CEPH_MMONCOMMANDACK_H
+
+#include "messages/PaxosServiceMessage.h"
+
+using ceph::common::cmdmap_from_json;
+using ceph::common::cmd_getval;
+
+class MMonCommandAck final : public PaxosServiceMessage {
+public:
+  std::vector<std::string> cmd;
+  errorcode32_t r;
+  std::string rs;
+
+  MMonCommandAck() : PaxosServiceMessage{MSG_MON_COMMAND_ACK, 0} {}
+  MMonCommandAck(const std::vector<std::string>& c, int _r, std::string s, version_t v) :
+    PaxosServiceMessage{MSG_MON_COMMAND_ACK, v},
+    cmd(c), r(_r), rs(s) { }
+private:
+  ~MMonCommandAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_command"; }
+  void print(std::ostream& o) const override {
+    cmdmap_t cmdmap;
+    std::ostringstream ss;
+    std::string prefix;
+    cmdmap_from_json(cmd, &cmdmap, ss);
+    cmd_getval(cmdmap, "prefix", prefix);
+    // Some config values contain sensitive data, so don't log them
+    o << "mon_command_ack(";
+    if (prefix == "config set") {
+      std::string name;
+      cmd_getval(cmdmap, "name", name);
+      o << "[{prefix=" << prefix
+        << ", name=" << name << "}]"
+        << "=" << r << " " << rs << " v" << version << ")";
+    } else if (prefix == "config-key set") {
+      std::string key;
+      cmd_getval(cmdmap, "key", key);
+      o << "[{prefix=" << prefix << ", key=" << key << "}]"
+        << "=" << r << " " << rs << " v" << version << ")";
+    } else {
+      o << cmd;
+    }
+    o << "=" << r << " " << rs << " v" << version << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(r, payload);
+    encode(rs, payload);
+    encode(cmd, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(r, p);
+    decode(rs, p);
+    decode(cmd, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonElection.h b/src/messages/MMonElection.h
new file mode 100644
index 000000000..8afb32c21
--- /dev/null
+++ b/src/messages/MMonElection.h
@@ -0,0 +1,144 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMONELECTION_H
+#define CEPH_MMONELECTION_H
+
+#include "common/ceph_releases.h"
+#include "msg/Message.h"
+#include "mon/MonMap.h"
+#include "mon/mon_types.h"
+
+class MMonElection final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 9;
+  static constexpr int COMPAT_VERSION = 5;
+
+public:
+  static constexpr int OP_PROPOSE = 1;
+  static constexpr int OP_ACK     = 2;
+  static constexpr int OP_NAK     = 3;
+  static constexpr int OP_VICTORY = 4;
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_PROPOSE: return "propose";
+    case OP_ACK: return "ack";
+    case OP_NAK: return "nak";
+    case OP_VICTORY: return "victory";
+    default: ceph_abort(); return 0;
+    }
+  }
+
+  uuid_d fsid;
+  int32_t op;
+  epoch_t epoch;
+  ceph::buffer::list monmap_bl;
+  std::set<int32_t> quorum;
+  uint64_t quorum_features;
+  mon_feature_t mon_features;
+  ceph_release_t mon_release{ceph_release_t::unknown};
+  ceph::buffer::list sharing_bl;
+  ceph::buffer::list scoring_bl;
+  uint8_t strategy;
+  std::map<std::string,std::string> metadata;
+  
+  MMonElection() : Message{MSG_MON_ELECTION, HEAD_VERSION, COMPAT_VERSION},
+    op(0), epoch(0),
+    quorum_features(0),
+    mon_features(0),
+    strategy(0)
+  { }
+
+  MMonElection(int o, epoch_t e, const bufferlist& bl, uint8_t s, MonMap *m)
+    : Message{MSG_MON_ELECTION, HEAD_VERSION, COMPAT_VERSION},
+      fsid(m->fsid), op(o), epoch(e),
+      quorum_features(0),
+      mon_features(0), scoring_bl(bl), strategy(s)
+  {
+    // encode using full feature set; we will reencode for dest later,
+    // if necessary
+    m->encode(monmap_bl, CEPH_FEATURES_ALL);
+  }
+private:
+  ~MMonElection() final {}
+
+public:
+  std::string_view get_type_name() const override { return "election"; }
+  void print(std::ostream& out) const override {
+    out << "election(" << fsid << " " << get_opname(op)
+	<< " rel " << (int)mon_release << " e" << epoch << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (monmap_bl.length() && (features != CEPH_FEATURES_ALL)) {
+      // reencode old-format monmap
+      MonMap t;
+      t.decode(monmap_bl);
+      monmap_bl.clear();
+      t.encode(monmap_bl, features);
+    }
+
+    encode(fsid, payload);
+    encode(op, payload);
+    encode(epoch, payload);
+    encode(monmap_bl, payload);
+    encode(quorum, payload);
+    encode(quorum_features, payload);
+    encode((version_t)0, payload);  // defunct
+    encode((version_t)0, payload);  // defunct
+    encode(sharing_bl, payload);
+    encode(mon_features, payload);
+    encode(metadata, payload);
+    encode(mon_release, payload);
+    encode(scoring_bl, payload);
+    encode(strategy, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(op, p);
+    decode(epoch, p);
+    decode(monmap_bl, p);
+    decode(quorum, p);
+    decode(quorum_features, p);
+    {
+      version_t v;  // defunct fields from old encoding
+      decode(v, p);
+      decode(v, p);
+    }
+    decode(sharing_bl, p);
+    if (header.version >= 6)
+      decode(mon_features, p);
+    if (header.version >= 7)
+      decode(metadata, p);
+    if (header.version >= 8)
+      decode(mon_release, p);
+    else
+      mon_release = infer_ceph_release_from_mon_features(mon_features);
+    if (header.version >= 9) {
+      decode(scoring_bl, p);
+      decode(strategy, p);
+    } else {
+      strategy = MonMap::election_strategy::CLASSIC;
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonGetMap.h b/src/messages/MMonGetMap.h
new file mode 100644
index 000000000..9192da077
--- /dev/null
+++ b/src/messages/MMonGetMap.h
@@ -0,0 +1,39 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONGETMAP_H
+#define CEPH_MMONGETMAP_H
+
+#include "msg/Message.h"
+
+#include "include/types.h"
+
+class MMonGetMap final : public Message {
+public:
+  MMonGetMap() : Message{CEPH_MSG_MON_GET_MAP} { }
+private:
+  ~MMonGetMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_getmap"; }
+  
+  void encode_payload(uint64_t features) override { }
+  void decode_payload() override { }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonGetOSDMap.h b/src/messages/MMonGetOSDMap.h
new file mode 100644
index 000000000..c70938b7e
--- /dev/null
+++ b/src/messages/MMonGetOSDMap.h
@@ -0,0 +1,97 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMONGETOSDMAP_H
+#define CEPH_MMONGETOSDMAP_H
+
+#include <iostream>
+#include <string>
+#include <string_view>
+
+#include "msg/Message.h"
+
+#include "include/types.h"
+
+class MMonGetOSDMap final : public PaxosServiceMessage {
+private:
+  epoch_t full_first, full_last;
+  epoch_t inc_first, inc_last;
+
+public:
+  MMonGetOSDMap()
+    : PaxosServiceMessage{CEPH_MSG_MON_GET_OSDMAP, 0},
+      full_first(0),
+      full_last(0),
+      inc_first(0),
+      inc_last(0) { }
+private:
+  ~MMonGetOSDMap() final {}
+
+public:
+  void request_full(epoch_t first, epoch_t last) {
+    ceph_assert(last >= first);
+    full_first = first;
+    full_last = last;
+  }
+  void request_inc(epoch_t first, epoch_t last) {
+    ceph_assert(last >= first);
+    inc_first = first;
+    inc_last = last;
+  }
+  epoch_t get_full_first() const {
+    return full_first;
+  }
+  epoch_t get_full_last() const {
+    return full_last;
+  }
+  epoch_t get_inc_first() const {
+    return inc_first;
+  }
+  epoch_t get_inc_last() const {
+    return inc_last;
+  }
+
+  std::string_view get_type_name() const override { return "mon_get_osdmap"; }
+  void print(std::ostream& out) const override {
+    out << "mon_get_osdmap(";
+    if (full_first && full_last)
+      out << "full " << full_first << "-" << full_last;
+    if (inc_first && inc_last)
+      out << " inc" << inc_first << "-" << inc_last;
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(full_first, payload);
+    encode(full_last, payload);
+    encode(inc_first, payload);
+    encode(inc_last, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(full_first, p);
+    decode(full_last, p);
+    decode(inc_first, p);
+    decode(inc_last, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonGetPurgedSnaps.h b/src/messages/MMonGetPurgedSnaps.h
new file mode 100644
index 000000000..9b1977e37
--- /dev/null
+++ b/src/messages/MMonGetPurgedSnaps.h
@@ -0,0 +1,45 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "PaxosServiceMessage.h"
+#include "include/types.h"
+
+class MMonGetPurgedSnaps final : public PaxosServiceMessage {
+public:
+  epoch_t start, last;
+
+  MMonGetPurgedSnaps(epoch_t s=0, epoch_t l=0)
+    : PaxosServiceMessage{MSG_MON_GET_PURGED_SNAPS, 0},
+      start(s),
+      last(l) {}
+private:
+  ~MMonGetPurgedSnaps() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "mon_get_purged_snaps";
+  }
+  void print(std::ostream& out) const override {
+    out << "mon_get_purged_snaps([" << start << "," << last << "])";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(start, payload);
+    encode(last, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(start, p);
+    decode(last, p);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MMonGetPurgedSnapsReply.h b/src/messages/MMonGetPurgedSnapsReply.h
new file mode 100644
index 000000000..7810ab6d7
--- /dev/null
+++ b/src/messages/MMonGetPurgedSnapsReply.h
@@ -0,0 +1,49 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "PaxosServiceMessage.h"
+#include "osd/osd_types.h"
+#include "include/types.h"
+
+class MMonGetPurgedSnapsReply final : public PaxosServiceMessage {
+public:
+  epoch_t start, last;
+  std::map<epoch_t,mempool::osdmap::map<int64_t,snap_interval_set_t>> purged_snaps;
+
+  MMonGetPurgedSnapsReply(epoch_t s=0, epoch_t l=0)
+    : PaxosServiceMessage{MSG_MON_GET_PURGED_SNAPS_REPLY, 0},
+      start(s),
+      last(l) {}
+private:
+  ~MMonGetPurgedSnapsReply() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "mon_get_purged_snaps_reply";
+  }
+  void print(std::ostream& out) const override {
+    out << "mon_get_purged_snaps_reply([" << start << "," << last << "])";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(start, payload);
+    encode(last, payload);
+    encode(purged_snaps, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(start, p);
+    decode(last, p);
+    decode(purged_snaps, p);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MMonGetVersion.h b/src/messages/MMonGetVersion.h
new file mode 100644
index 000000000..ad91cd155
--- /dev/null
+++ b/src/messages/MMonGetVersion.h
@@ -0,0 +1,60 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMONGETVERSION_H
+#define CEPH_MMONGETVERSION_H
+
+#include "msg/Message.h"
+
+#include "include/types.h"
+
+/*
+ * This message is sent to the monitors to verify that the client's
+ * version of the map(s) is the latest available. For example, this
+ * can be used to determine whether a pool actually does not exist, or
+ * if it may have been created but the map was not received yet.
+ */
+class MMonGetVersion final : public Message {
+public:
+  MMonGetVersion() : Message{CEPH_MSG_MON_GET_VERSION} {}
+
+  std::string_view get_type_name() const override {
+    return "mon_get_version";
+  }
+
+  void print(std::ostream& o) const override {
+    o << "mon_get_version(what=" << what << " handle=" << handle << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(handle, payload);
+    encode(what, payload);
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(handle, p);
+    decode(what, p);
+  }
+
+  ceph_tid_t handle = 0;
+  std::string what;
+
+private:
+  ~MMonGetVersion() final {}
+};
+
+#endif
diff --git a/src/messages/MMonGetVersionReply.h b/src/messages/MMonGetVersionReply.h
new file mode 100644
index 000000000..407b449a0
--- /dev/null
+++ b/src/messages/MMonGetVersionReply.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMONGETVERSIONREPLY_H
+#define CEPH_MMONGETVERSIONREPLY_H
+
+#include "msg/Message.h"
+
+#include "include/types.h"
+
+/*
+ * This message is sent from the monitors to clients in response to a
+ * MMonGetVersion. The latest version of the requested thing is sent
+ * back.
+ */
+class MMonGetVersionReply final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 2;
+
+public:
+  MMonGetVersionReply() : Message{CEPH_MSG_MON_GET_VERSION_REPLY, HEAD_VERSION} { }
+
+  std::string_view get_type_name() const override {
+    return "mon_get_version_reply";
+  }
+
+  void print(std::ostream& o) const override {
+    o << "mon_get_version_reply(handle=" << handle << " version=" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(handle, payload);
+    encode(version, payload);
+    encode(oldest_version, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(handle, p);
+    decode(version, p);
+    if (header.version >= 2)
+      decode(oldest_version, p);
+  }
+
+  ceph_tid_t handle = 0;
+  version_t version = 0;
+  version_t oldest_version = 0;
+
+private:
+  ~MMonGetVersionReply() final {}
+};
+
+#endif
diff --git a/src/messages/MMonGlobalID.h b/src/messages/MMonGlobalID.h
new file mode 100644
index 000000000..4330974e0
--- /dev/null
+++ b/src/messages/MMonGlobalID.h
@@ -0,0 +1,50 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONGLOBALID_H
+#define CEPH_MMONGLOBALID_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MMonGlobalID final : public PaxosServiceMessage {
+public:
+  uint64_t old_max_id = 0;
+  MMonGlobalID() : PaxosServiceMessage{MSG_MON_GLOBAL_ID, 0}
+  {}
+private:
+  ~MMonGlobalID() final {}
+
+public:
+  std::string_view get_type_name() const override { return "global_id"; }
+  void print(std::ostream& out) const override {
+    out << "global_id  (" << old_max_id << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(old_max_id, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(old_max_id, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonHealth.h b/src/messages/MMonHealth.h
new file mode 100644
index 000000000..9f5d4084c
--- /dev/null
+++ b/src/messages/MMonHealth.h
@@ -0,0 +1,63 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2012 Inktank, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+#ifndef CEPH_MMON_HEALTH_H
+#define CEPH_MMON_HEALTH_H
+
+#include "msg/Message.h"
+#include "messages/MMonQuorumService.h"
+#include "mon/mon_types.h"
+
+class MMonHealth final : public MMonQuorumService {
+public:
+  static constexpr int HEAD_VERSION = 1;
+
+  int service_type = 0;
+  int service_op = 0;
+
+  // service specific data
+  DataStats data_stats;
+
+  MMonHealth() : MMonQuorumService{MSG_MON_HEALTH, HEAD_VERSION} { }
+
+private:
+  ~MMonHealth() final { }
+
+public:
+  std::string_view get_type_name() const override { return "mon_health"; }
+  void print(std::ostream &o) const override {
+    o << "mon_health("
+      << " e " << get_epoch()
+      << " r " << get_round()
+      << " )";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    service_decode(p);
+    decode(service_type, p);
+    decode(service_op, p);
+    decode(data_stats, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    service_encode();
+    encode(service_type, payload);
+    encode(service_op, payload);
+    encode(data_stats, payload);
+  }
+};
+
+#endif /* CEPH_MMON_HEALTH_H */
diff --git a/src/messages/MMonHealthChecks.h b/src/messages/MMonHealthChecks.h
new file mode 100644
index 000000000..9dd726fd4
--- /dev/null
+++ b/src/messages/MMonHealthChecks.h
@@ -0,0 +1,51 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MMON_HEALTH_CHECKS_H
+#define CEPH_MMON_HEALTH_CHECKS_H
+
+#include "messages/PaxosServiceMessage.h"
+#include "mon/health_check.h"
+
+class MMonHealthChecks final : public PaxosServiceMessage {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  health_check_map_t health_checks;
+
+  MMonHealthChecks()
+    : PaxosServiceMessage{MSG_MON_HEALTH_CHECKS, HEAD_VERSION, COMPAT_VERSION} {
+  }
+  MMonHealthChecks(health_check_map_t& m)
+    : PaxosServiceMessage{MSG_MON_HEALTH_CHECKS, HEAD_VERSION, COMPAT_VERSION},
+      health_checks(m)
+  {}
+
+private:
+  ~MMonHealthChecks() final { }
+
+public:
+  std::string_view get_type_name() const override { return "mon_health_checks"; }
+  void print(std::ostream &o) const override {
+    o << "mon_health_checks(" << health_checks.checks.size() << " checks)";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(health_checks, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(health_checks, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonJoin.h b/src/messages/MMonJoin.h
new file mode 100644
index 000000000..d047cc3d9
--- /dev/null
+++ b/src/messages/MMonJoin.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONJOIN_H
+#define CEPH_MMONJOIN_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MMonJoin final : public PaxosServiceMessage {
+public:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 2;
+
+  uuid_d fsid;
+  std::string name;
+  entity_addrvec_t addrs;
+  /* The location members are for stretch mode. crush_loc is the location
+   * (generally just a "datacenter=<foo>" statement) of the monitor. The
+   * force_loc is whether the mon cluster should replace a previously-known
+   * location. Generally the monitor will force an update if it's given a
+   * location from the CLI on boot-up, and then never force again (so that it
+   * can be moved/updated via the ceph tool from elsewhere). */
+  std::map<std::string,std::string> crush_loc;
+  bool force_loc{false};
+
+  MMonJoin() : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION} {}
+  MMonJoin(uuid_d &f, std::string n, const entity_addrvec_t& av)
+    : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), name(n), addrs(av)
+  { }
+  MMonJoin(uuid_d &f, std::string n, const entity_addrvec_t& av,
+	   const std::map<std::string,std::string>& cloc, bool force)
+    : PaxosServiceMessage{MSG_MON_JOIN, 0, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), name(n), addrs(av), crush_loc(cloc), force_loc(force)
+  { }
+  
+private:
+  ~MMonJoin() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_join"; }
+  void print(std::ostream& o) const override {
+    o << "mon_join(" << name << " " << addrs << " " << crush_loc << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(name, payload);
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(addrs, payload, features);
+    encode(crush_loc, payload);
+    encode(force_loc, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(name, p);
+    assert(header.version > 1);
+    decode(addrs, p);
+    if (header.version >= 3) {
+      decode(crush_loc, p);
+      decode(force_loc, p);
+    }
+  }
+};
+
+#endif
diff --git a/src/messages/MMonMap.h b/src/messages/MMonMap.h
new file mode 100644
index 000000000..e72c115f6
--- /dev/null
+++ b/src/messages/MMonMap.h
@@ -0,0 +1,62 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONMAP_H
+#define CEPH_MMONMAP_H
+
+#include "include/encoding.h"
+#include "include/ceph_features.h"
+#include "msg/Message.h"
+#include "msg/MessageRef.h"
+#include "mon/MonMap.h"
+
+class MMonMap final : public Message {
+public:
+  ceph::buffer::list monmapbl;
+
+  MMonMap() : Message{CEPH_MSG_MON_MAP} { }
+  explicit MMonMap(ceph::buffer::list &bl) : Message{CEPH_MSG_MON_MAP} {
+    monmapbl = std::move(bl);
+  }
+private:
+  ~MMonMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_map"; }
+
+  void encode_payload(uint64_t features) override { 
+    if (monmapbl.length() &&
+	((features & CEPH_FEATURE_MONENC) == 0 ||
+	 (features & CEPH_FEATURE_MSG_ADDR2) == 0)) {
+      // reencode old-format monmap
+      MonMap t;
+      t.decode(monmapbl);
+      monmapbl.clear();
+      t.encode(monmapbl, features);
+    }
+
+    using ceph::encode;
+    encode(monmapbl, payload);
+  }
+  void decode_payload() override { 
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(monmapbl, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonMgrReport.h b/src/messages/MMonMgrReport.h
new file mode 100644
index 000000000..f5a68c7d3
--- /dev/null
+++ b/src/messages/MMonMgrReport.h
@@ -0,0 +1,94 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Greg Farnum/Red Hat <gfarnum@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMONMGRREPORT_H
+#define CEPH_MMONMGRREPORT_H
+
+#include "messages/PaxosServiceMessage.h"
+#include "include/types.h"
+#include "include/health.h"
+#include "mon/health_check.h"
+#include "mon/PGMap.h"
+
+class MMonMgrReport final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  // PGMapDigest is in data payload
+  health_check_map_t health_checks;
+  ceph::buffer::list service_map_bl;  // encoded ServiceMap
+  std::map<std::string,ProgressEvent> progress_events;
+  uint64_t gid = 0;
+
+  MMonMgrReport()
+    : PaxosServiceMessage{MSG_MON_MGR_REPORT, 0, HEAD_VERSION, COMPAT_VERSION}
+  {}
+private:
+  ~MMonMgrReport() final {}
+
+public:
+  std::string_view get_type_name() const override { return "monmgrreport"; }
+
+  void print(std::ostream& out) const override {
+    out << get_type_name() << "(gid " << gid
+	<< ", " << health_checks.checks.size() << " checks, "
+	<< progress_events.size() << " progress events)";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(health_checks, payload);
+    encode(service_map_bl, payload);
+    encode(progress_events, payload);
+    encode(gid, payload);
+
+    if (!HAVE_FEATURE(features, SERVER_NAUTILUS) ||
+	!HAVE_FEATURE(features, SERVER_MIMIC)) {
+      // PGMapDigest had a backwards-incompatible change between
+      // luminous and mimic, and conditionally encodes based on
+      // provided features, so reencode the one in our data payload.
+      // The mgr isn't able to do this at the time the encoded
+      // PGMapDigest is constructed because we don't know which mon we
+      // will target.  Note that this only triggers if the user
+      // upgrades ceph-mgr before ceph-mon (tsk tsk).
+      PGMapDigest digest;
+      auto p = data.cbegin();
+      decode(digest, p);
+      ceph::buffer::list bl;
+      encode(digest, bl, features);
+      set_data(bl);
+    }
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(health_checks, p);
+    decode(service_map_bl, p);
+    if (header.version >= 2) {
+      decode(progress_events, p);
+    }
+    if (header.version >= 3) {
+      decode(gid, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonPaxos.h b/src/messages/MMonPaxos.h
new file mode 100644
index 000000000..e1aabc64c
--- /dev/null
+++ b/src/messages/MMonPaxos.h
@@ -0,0 +1,135 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMONPAXOS_H
+#define CEPH_MMONPAXOS_H
+
+#include "messages/PaxosServiceMessage.h"
+#include "mon/mon_types.h"
+#include "include/ceph_features.h"
+
+class MMonPaxos final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 3;
+
+ public:
+  // op types
+  static constexpr int OP_COLLECT =   1; // proposer: propose round
+  static constexpr int OP_LAST =      2; // voter:    accept proposed round
+  static constexpr int OP_BEGIN =     3; // proposer: value proposed for this round
+  static constexpr int OP_ACCEPT =    4; // voter:    accept propsed value
+  static constexpr int OP_COMMIT =    5; // proposer: notify learners of agreed value
+  static constexpr int OP_LEASE =     6; // leader: extend peon lease
+  static constexpr int OP_LEASE_ACK = 7; // peon: lease ack
+  static const char *get_opname(int op) {
+    switch (op) {
+    case OP_COLLECT: return "collect";
+    case OP_LAST: return "last";
+    case OP_BEGIN: return "begin";
+    case OP_ACCEPT: return "accept";
+    case OP_COMMIT: return "commit";
+    case OP_LEASE: return "lease";
+    case OP_LEASE_ACK: return "lease_ack";
+    default: ceph_abort(); return 0;
+    }
+  }
+
+  epoch_t epoch = 0;   // monitor epoch
+  __s32 op = 0;          // paxos op
+
+  version_t first_committed = 0;  // i've committed to
+  version_t last_committed = 0;  // i've committed to
+  version_t pn_from = 0;         // i promise to accept after
+  version_t pn = 0;              // with with proposal
+  version_t uncommitted_pn = 0;     // previous pn, if we are a LAST with an uncommitted value
+  utime_t lease_timestamp;
+  utime_t sent_timestamp;
+
+  version_t latest_version = 0;
+  ceph::buffer::list latest_value;
+
+  std::map<version_t,ceph::buffer::list> values;
+
+  ceph::buffer::list feature_map;
+
+  MMonPaxos() : Message{MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION} { }
+  MMonPaxos(epoch_t e, int o, utime_t now) : 
+    Message{MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION},
+    epoch(e),
+    op(o),
+    first_committed(0), last_committed(0), pn_from(0), pn(0), uncommitted_pn(0),
+    sent_timestamp(now),
+    latest_version(0) {
+  }
+
+private:
+  ~MMonPaxos() final {}
+
+public:
+  std::string_view get_type_name() const override { return "paxos"; }
+
+  void print(std::ostream& out) const override {
+    out << "paxos(" << get_opname(op) 
+	<< " lc " << last_committed
+	<< " fc " << first_committed
+	<< " pn " << pn << " opn " << uncommitted_pn;
+    if (latest_version)
+      out << " latest " << latest_version << " (" << latest_value.length() << " bytes)";
+    out <<  ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    encode(epoch, payload);
+    encode(op, payload);
+    encode(first_committed, payload);
+    encode(last_committed, payload);
+    encode(pn_from, payload);
+    encode(pn, payload);
+    encode(uncommitted_pn, payload);
+    encode(lease_timestamp, payload);
+    encode(sent_timestamp, payload);
+    encode(latest_version, payload);
+    encode(latest_value, payload);
+    encode(values, payload);
+    encode(feature_map, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(op, p);
+    decode(first_committed, p);
+    decode(last_committed, p);
+    decode(pn_from, p);   
+    decode(pn, p);   
+    decode(uncommitted_pn, p);
+    decode(lease_timestamp, p);
+    decode(sent_timestamp, p);
+    decode(latest_version, p);
+    decode(latest_value, p);
+    decode(values, p);
+    if (header.version >= 4) {
+      decode(feature_map, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonPing.h b/src/messages/MMonPing.h
new file mode 100644
index 000000000..c6f697e50
--- /dev/null
+++ b/src/messages/MMonPing.h
@@ -0,0 +1,109 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/**
+ * This is used to send pings between monitors for
+ * heartbeat purposes. We include a timestamp and distinguish between
+ * outgoing pings and responses to those. If you set the
+ * min_message in the constructor, the message will inflate itself
+ * to the specified size -- this is good for dealing with network
+ * issues with jumbo frames. See http://tracker.ceph.com/issues/20087
+ *
+ */
+
+#ifndef CEPH_MMONPING_H
+#define CEPH_MMONPING_H
+
+#include "common/Clock.h"
+
+#include "msg/Message.h"
+#include "mon/ConnectionTracker.h"
+
+class MMonPing final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+ public:
+  enum {
+    PING = 1,
+    PING_REPLY = 2,
+  };
+  const char *get_op_name(int op) const {
+    switch (op) {
+    case PING: return "ping";
+    case PING_REPLY: return "ping_reply";
+    default: return "???";
+    }
+  }
+
+  __u8 op = 0;
+  utime_t stamp;
+  bufferlist tracker_bl;
+  uint32_t min_message_size = 0;
+
+  MMonPing(__u8 o, utime_t s, const bufferlist& tbl,
+	   uint32_t min_message)
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION},
+      op(o), stamp(s), tracker_bl(tbl), min_message_size(min_message)
+  {}
+  MMonPing(__u8 o, utime_t s, const bufferlist& tbl)
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION},
+      op(o), stamp(s), tracker_bl(tbl) {}
+  MMonPing()
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION}
+  {}
+private:
+  ~MMonPing() final {}
+
+public:
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(stamp, p);
+    decode(tracker_bl, p);
+
+    int payload_mid_length = p.get_off();
+    uint32_t size;
+    decode(size, p);
+    p += size;
+    min_message_size = size + payload_mid_length;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(stamp, payload);
+    encode(tracker_bl, payload);
+
+    size_t s = 0;
+    if (min_message_size > payload.length()) {
+      s = min_message_size - payload.length();
+    }
+    encode((uint32_t)s, payload);
+    if (s) {
+      // this should be big enough for normal min_message padding sizes. since
+      // we are targeting jumbo ethernet frames around 9000 bytes, 16k should
+      // be more than sufficient!  the compiler will statically zero this so
+      // that at runtime we are only adding a bufferptr reference to it.
+      static char zeros[16384] = {};
+      while (s > sizeof(zeros)) {
+        payload.append(buffer::create_static(sizeof(zeros), zeros));
+        s -= sizeof(zeros);
+      }
+      if (s) {
+        payload.append(buffer::create_static(s, zeros));
+      }
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mon_ping"; }
+  void print(std::ostream& out) const override {
+    out << "mon_ping(" << get_op_name(op)
+	<< " stamp " << stamp
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonProbe.h b/src/messages/MMonProbe.h
new file mode 100644
index 000000000..ae5fc3028
--- /dev/null
+++ b/src/messages/MMonProbe.h
@@ -0,0 +1,153 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MMONPROBE_H
+#define CEPH_MMONPROBE_H
+
+#include "include/ceph_features.h"
+#include "common/ceph_releases.h"
+#include "msg/Message.h"
+#include "mon/MonMap.h"
+
+class MMonProbe final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 8;
+  static constexpr int COMPAT_VERSION = 5;
+
+  enum {
+    OP_PROBE = 1,
+    OP_REPLY = 2,
+    OP_SLURP = 3,
+    OP_SLURP_LATEST = 4,
+    OP_DATA = 5,
+    OP_MISSING_FEATURES = 6,
+  };
+
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_PROBE: return "probe";
+    case OP_REPLY: return "reply";
+    case OP_SLURP: return "slurp";
+    case OP_SLURP_LATEST: return "slurp_latest";
+    case OP_DATA: return "data";
+    case OP_MISSING_FEATURES: return "missing_features";
+    default: ceph_abort(); return 0;
+    }
+  }
+  
+  uuid_d fsid;
+  int32_t op = 0;
+  std::string name;
+  std::set<int32_t> quorum;
+  int leader = -1;
+  ceph::buffer::list monmap_bl;
+  version_t paxos_first_version = 0;
+  version_t paxos_last_version = 0;
+  bool has_ever_joined = 0;
+  uint64_t required_features = 0;
+  ceph_release_t mon_release{ceph_release_t::unknown};
+
+  MMonProbe()
+    : Message{MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION} {}
+  MMonProbe(const uuid_d& f, int o, const std::string& n, bool hej, ceph_release_t mr)
+    : Message{MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f),
+      op(o),
+      name(n),
+      paxos_first_version(0),
+      paxos_last_version(0),
+      has_ever_joined(hej),
+      required_features(0),
+      mon_release{mr} {}
+private:
+  ~MMonProbe() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_probe"; }
+  void print(std::ostream& out) const override {
+    out << "mon_probe(" << get_opname(op) << " " << fsid << " name " << name;
+    if (quorum.size())
+      out << " quorum " << quorum;
+    out << " leader " << leader;
+    if (op == OP_REPLY) {
+      out << " paxos("
+	<< " fc " << paxos_first_version
+	<< " lc " << paxos_last_version
+	<< " )";
+    }
+    if (!has_ever_joined)
+      out << " new";
+    if (required_features)
+      out << " required_features " << required_features;
+    if (mon_release != ceph_release_t::unknown)
+      out << " mon_release " << mon_release;
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (monmap_bl.length() &&
+	((features & CEPH_FEATURE_MONENC) == 0 ||
+	 (features & CEPH_FEATURE_MSG_ADDR2) == 0)) {
+      // reencode old-format monmap
+      MonMap t;
+      t.decode(monmap_bl);
+      monmap_bl.clear();
+      t.encode(monmap_bl, features);
+    }
+
+    encode(fsid, payload);
+    encode(op, payload);
+    encode(name, payload);
+    encode(quorum, payload);
+    encode(monmap_bl, payload);
+    encode(has_ever_joined, payload);
+    encode(paxos_first_version, payload);
+    encode(paxos_last_version, payload);
+    encode(required_features, payload);
+    encode(mon_release, payload);
+    encode(leader, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(op, p);
+    decode(name, p);
+    decode(quorum, p);
+    decode(monmap_bl, p);
+    decode(has_ever_joined, p);
+    decode(paxos_first_version, p);
+    decode(paxos_last_version, p);
+    if (header.version >= 6)
+      decode(required_features, p);
+    else
+      required_features = 0;
+    if (header.version >= 7)
+      decode(mon_release, p);
+    else
+      mon_release = ceph_release_t::unknown;
+    if (header.version >= 8) {
+      decode(leader, p);
+    } else if (quorum.size()) {
+      leader = *quorum.begin();
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonQuorumService.h b/src/messages/MMonQuorumService.h
new file mode 100644
index 000000000..23de9af51
--- /dev/null
+++ b/src/messages/MMonQuorumService.h
@@ -0,0 +1,70 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2012 Inktank, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+#ifndef CEPH_MMON_QUORUM_SERVICE_H
+#define CEPH_MMON_QUORUM_SERVICE_H
+
+#include "msg/Message.h"
+
+class MMonQuorumService : public Message {
+public:
+  epoch_t epoch = 0;
+  version_t round = 0;
+
+protected:
+  MMonQuorumService(int type, int head)
+    : Message{type, head, 1}
+  {}
+  ~MMonQuorumService() override {}
+
+public:
+  void set_epoch(epoch_t e) {
+    epoch = e;
+  }
+
+  void set_round(version_t r) {
+    round = r;
+  }
+
+  epoch_t get_epoch() const {
+    return epoch;
+  }
+
+  version_t get_round() const {
+    return round;
+  }
+
+  void service_encode() {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(round, payload);
+  }
+
+  void service_decode(ceph::buffer::list::const_iterator &p) {
+    using ceph::decode;
+    decode(epoch, p);
+    decode(round, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    ceph_abort_msg("MMonQuorumService message must always be a base class");
+  }
+
+  void decode_payload() override {
+    ceph_abort_msg("MMonQuorumService message must always be a base class");
+  }
+
+  std::string_view get_type_name() const override { return "quorum_service"; }
+};
+
+#endif /* CEPH_MMON_QUORUM_SERVICE_H */
diff --git a/src/messages/MMonScrub.h b/src/messages/MMonScrub.h
new file mode 100644
index 000000000..b3b99b43f
--- /dev/null
+++ b/src/messages/MMonScrub.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+* Ceph - scalable distributed file system
+*
+* Copyright (C) 2013 Inktank, Inc.
+*
+* This is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License version 2.1, as published by the Free Software
+* Foundation. See file COPYING.
+*/
+#ifndef CEPH_MMONSCRUB_H
+#define CEPH_MMONSCRUB_H
+
+#include "msg/Message.h"
+#include "mon/mon_types.h"
+
+class MMonScrub : public Message {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  typedef enum {
+    OP_SCRUB = 1,         // leader->peon: scrub (a range of) keys
+    OP_RESULT = 2,        // peon->leader: result of a scrub
+  } op_type_t;
+
+  static const char *get_opname(op_type_t op) {
+    switch (op) {
+    case OP_SCRUB: return "scrub";
+    case OP_RESULT: return "result";
+    default: ceph_abort_msg("unknown op type"); return NULL;
+    }
+  }
+
+  op_type_t op = OP_SCRUB;
+  version_t version = 0;
+  ScrubResult result;
+  int32_t num_keys;
+  std::pair<std::string,std::string> key;
+
+  MMonScrub()
+    : Message{MSG_MON_SCRUB, HEAD_VERSION, COMPAT_VERSION},
+      num_keys(-1)
+  { }
+
+  MMonScrub(op_type_t op, version_t v, int32_t num_keys)
+    : Message{MSG_MON_SCRUB, HEAD_VERSION, COMPAT_VERSION},
+      op(op), version(v), num_keys(num_keys)
+  { }
+
+  std::string_view get_type_name() const override { return "mon_scrub"; }
+
+  void print(std::ostream& out) const override {
+    out << "mon_scrub(" << get_opname((op_type_t)op);
+    out << " v " << version;
+    if (op == OP_RESULT)
+      out << " " << result;
+    out << " num_keys " << num_keys;
+    out << " key (" << key << ")";
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    uint8_t o = op;
+    encode(o, payload);
+    encode(version, payload);
+    encode(result, payload);
+    encode(num_keys, payload);
+    encode(key, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    uint8_t o;
+    decode(o, p);
+    op = (op_type_t)o;
+    decode(version, p);
+    decode(result, p);
+    decode(num_keys, p);
+    decode(key, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif /* CEPH_MMONSCRUB_H */
diff --git a/src/messages/MMonSubscribe.h b/src/messages/MMonSubscribe.h
new file mode 100644
index 000000000..55220b0ce
--- /dev/null
+++ b/src/messages/MMonSubscribe.h
@@ -0,0 +1,103 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONSUBSCRIBE_H
+#define CEPH_MMONSUBSCRIBE_H
+
+#include "msg/Message.h"
+#include "include/ceph_features.h"
+
+/*
+ * compatibility with old crap
+ */
+struct ceph_mon_subscribe_item_old {
+	ceph_le64 unused;
+	ceph_le64 have;
+	__u8 onetime;
+} __attribute__ ((packed));
+WRITE_RAW_ENCODER(ceph_mon_subscribe_item_old)
+
+
+class MMonSubscribe final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+  std::string hostname;
+  std::map<std::string, ceph_mon_subscribe_item> what;
+
+  MMonSubscribe() : Message{CEPH_MSG_MON_SUBSCRIBE, HEAD_VERSION, COMPAT_VERSION} { }
+private:
+  ~MMonSubscribe() final {}
+
+public:
+  void sub_want(const char *w, version_t start, unsigned flags) {
+    what[w].start = start;
+    what[w].flags = flags;
+  }
+
+  std::string_view get_type_name() const override { return "mon_subscribe"; }
+  void print(std::ostream& o) const override {
+    o << "mon_subscribe(" << what << ")";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    if (header.version < 2) {
+      std::map<std::string, ceph_mon_subscribe_item_old> oldwhat;
+      decode(oldwhat, p);
+      what.clear();
+      for (auto q = oldwhat.begin(); q != oldwhat.end(); q++) {
+	if (q->second.have)
+	  what[q->first].start = q->second.have + 1;
+	else
+	  what[q->first].start = 0;
+	what[q->first].flags = 0;
+	if (q->second.onetime)
+	  what[q->first].flags |= CEPH_SUBSCRIBE_ONETIME;
+      }
+      return;
+    }
+    decode(what, p);
+    if (header.version >= 3) {
+      decode(hostname, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if ((features & CEPH_FEATURE_SUBSCRIBE2) == 0) {
+      header.version = 0;
+      std::map<std::string, ceph_mon_subscribe_item_old> oldwhat;
+      for (auto q = what.begin(); q != what.end(); q++) {
+	if (q->second.start)
+	  // warning: start=1 -> have=0, which was ambiguous
+	  oldwhat[q->first].have = q->second.start - 1;
+	else
+	  oldwhat[q->first].have = 0;
+	oldwhat[q->first].onetime = q->second.flags & CEPH_SUBSCRIBE_ONETIME;
+      }
+      encode(oldwhat, payload);
+      return;
+    }
+    header.version = HEAD_VERSION;
+    encode(what, payload);
+    encode(hostname, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonSubscribeAck.h b/src/messages/MMonSubscribeAck.h
new file mode 100644
index 000000000..2f6e2eddb
--- /dev/null
+++ b/src/messages/MMonSubscribeAck.h
@@ -0,0 +1,55 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MMONSUBSCRIBEACK_H
+#define CEPH_MMONSUBSCRIBEACK_H
+
+#include "msg/Message.h"
+
+class MMonSubscribeAck final : public Message {
+public:
+  __u32 interval;
+  uuid_d fsid;
+  
+  MMonSubscribeAck() : Message{CEPH_MSG_MON_SUBSCRIBE_ACK},
+		       interval(0) {
+  }
+  MMonSubscribeAck(uuid_d& f, int i) : Message{CEPH_MSG_MON_SUBSCRIBE_ACK},
+				       interval(i), fsid(f) { }
+private:
+  ~MMonSubscribeAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "mon_subscribe_ack"; }
+  void print(std::ostream& o) const override {
+    o << "mon_subscribe_ack(" << interval << "s)";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(interval, p);
+    decode(fsid, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(interval, payload);
+    encode(fsid, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MMonSync.h b/src/messages/MMonSync.h
new file mode 100644
index 000000000..a9e6184be
--- /dev/null
+++ b/src/messages/MMonSync.h
@@ -0,0 +1,116 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+* Ceph - scalable distributed file system
+*
+* Copyright (C) 2012 Inktank, Inc.
+*
+* This is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License version 2.1, as published by the Free Software
+* Foundation. See file COPYING.
+*/
+#ifndef CEPH_MMONSYNC_H
+#define CEPH_MMONSYNC_H
+
+#include "msg/Message.h"
+
+class MMonSync : public Message {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  /**
+  * Operation types
+  */
+  enum {
+    OP_GET_COOKIE_FULL = 1,   // -> start a session (full scan)
+    OP_GET_COOKIE_RECENT = 2, // -> start a session (only recent paxos events)
+    OP_COOKIE = 3,            // <- pass the iterator cookie, or
+    OP_GET_CHUNK = 4,         // -> get some keys
+    OP_CHUNK = 5,             // <- return some keys
+    OP_LAST_CHUNK = 6,        // <- return the last set of keys
+    OP_NO_COOKIE = 8,         // <- sorry, no cookie
+  };
+
+  /**
+  * Obtain a string corresponding to the operation type @p op
+  *
+  * @param op Operation type
+  * @returns A string
+  */
+  static const char *get_opname(int op) {
+    switch (op) {
+    case OP_GET_COOKIE_FULL: return "get_cookie_full";
+    case OP_GET_COOKIE_RECENT: return "get_cookie_recent";
+    case OP_COOKIE: return "cookie";
+    case OP_GET_CHUNK: return "get_chunk";
+    case OP_CHUNK: return "chunk";
+    case OP_LAST_CHUNK: return "last_chunk";
+    case OP_NO_COOKIE: return "no_cookie";
+    default: ceph_abort_msg("unknown op type"); return NULL;
+    }
+  }
+
+  uint32_t op = 0;
+  uint64_t cookie = 0;
+  version_t last_committed = 0;
+  std::pair<std::string,std::string> last_key;
+  ceph::buffer::list chunk_bl;
+  entity_inst_t reply_to;
+
+  MMonSync()
+    : Message{MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION}
+  { }
+
+  MMonSync(uint32_t op, uint64_t c = 0)
+    : Message{MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION},
+      op(op),
+      cookie(c),
+      last_committed(0)
+  { }
+
+  std::string_view get_type_name() const override { return "mon_sync"; }
+
+  void print(std::ostream& out) const override {
+    out << "mon_sync(" << get_opname(op);
+    if (cookie)
+      out << " cookie " << cookie;
+    if (last_committed > 0)
+      out << " lc " << last_committed;
+    if (chunk_bl.length())
+      out << " bl " << chunk_bl.length() << " bytes";
+    if (!last_key.first.empty() || !last_key.second.empty())
+      out << " last_key " << last_key.first << "," << last_key.second;
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(cookie, payload);
+    encode(last_committed, payload);
+    encode(last_key.first, payload);
+    encode(last_key.second, payload);
+    encode(chunk_bl, payload);
+    encode(reply_to, payload, features);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(cookie, p);
+    decode(last_committed, p);
+    decode(last_key.first, p);
+    decode(last_key.second, p);
+    decode(chunk_bl, p);
+    decode(reply_to, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif /* CEPH_MMONSYNC_H */
diff --git a/src/messages/MMonUsedPendingKeys.h b/src/messages/MMonUsedPendingKeys.h
new file mode 100644
index 000000000..482330a49
--- /dev/null
+++ b/src/messages/MMonUsedPendingKeys.h
@@ -0,0 +1,48 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#pragma once
+
+#include "messages/PaxosServiceMessage.h"
+
+class MMonUsedPendingKeys final : public PaxosServiceMessage {
+public:
+  std::map<EntityName,CryptoKey> used_pending_keys;
+  
+  MMonUsedPendingKeys() : PaxosServiceMessage{MSG_MON_USED_PENDING_KEYS, 0}
+  {}
+private:
+  ~MMonUsedPendingKeys() final {}
+
+public:
+  std::string_view get_type_name() const override { return "used_pending_keys"; }
+  void print(std::ostream& out) const override {
+    out << "used_pending_keys(" << used_pending_keys.size() << " keys)";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(used_pending_keys, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(used_pending_keys, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDAlive.h b/src/messages/MOSDAlive.h
new file mode 100644
index 000000000..f43e9e266
--- /dev/null
+++ b/src/messages/MOSDAlive.h
@@ -0,0 +1,53 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+
+#ifndef CEPH_MOSDALIVE_H
+#define CEPH_MOSDALIVE_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDAlive final : public PaxosServiceMessage {
+public:
+  epoch_t want = 0;
+
+  MOSDAlive(epoch_t h, epoch_t w) : PaxosServiceMessage{MSG_OSD_ALIVE, h}, want(w) {}
+  MOSDAlive() : MOSDAlive{0, 0} {}
+private:
+  ~MOSDAlive() final {}
+
+public:
+  void encode_payload(uint64_t features) override {
+    paxos_encode();
+    using ceph::encode;
+    encode(want, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    using ceph::decode;
+    decode(want, p);
+  }
+
+  std::string_view get_type_name() const override { return "osd_alive"; }
+  void print(std::ostream &out) const override {
+    out << "osd_alive(want up_thru " << want << " have " << version << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDBackoff.h b/src/messages/MOSDBackoff.h
new file mode 100644
index 000000000..82218d2fa
--- /dev/null
+++ b/src/messages/MOSDBackoff.h
@@ -0,0 +1,86 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDBACKOFF_H
+#define CEPH_MOSDBACKOFF_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/osd_types.h"
+
+class MOSDBackoff : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  spg_t pgid;
+  epoch_t map_epoch = 0;
+  uint8_t op = 0;           ///< CEPH_OSD_BACKOFF_OP_*
+  uint64_t id = 0;          ///< unique id within this session
+  hobject_t begin, end;     ///< [) range to block, unless ==, block single obj
+
+  spg_t get_spg() const override {
+    return pgid;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+
+  MOSDBackoff()
+    : MOSDFastDispatchOp{CEPH_MSG_OSD_BACKOFF, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDBackoff(spg_t pgid_, epoch_t ep, uint8_t op_, uint64_t id_,
+	      hobject_t begin_, hobject_t end_)
+    : MOSDFastDispatchOp{CEPH_MSG_OSD_BACKOFF, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid_),
+      map_epoch(ep),
+      op(op_),
+      id(id_),
+      begin(begin_),
+      end(end_) { }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(id, payload);
+    encode(begin, payload);
+    encode(end, payload);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    decode(id, p);
+    decode(begin, p);
+    decode(end, p);
+  }
+
+  std::string_view get_type_name() const override { return "osd_backoff"; }
+
+  void print(std::ostream& out) const override {
+    out << "osd_backoff(" << pgid << " " << ceph_osd_backoff_op_name(op)
+	<< " id " << id
+	<< " [" << begin << "," << end << ")"
+	<< " e" << map_epoch << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDBeacon.h b/src/messages/MOSDBeacon.h
new file mode 100644
index 000000000..998d6e638
--- /dev/null
+++ b/src/messages/MOSDBeacon.h
@@ -0,0 +1,64 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "PaxosServiceMessage.h"
+
+class MOSDBeacon : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  std::vector<pg_t> pgs;
+  epoch_t min_last_epoch_clean = 0;
+  utime_t last_purged_snaps_scrub;
+  int osd_beacon_report_interval = 0;
+
+  MOSDBeacon()
+    : PaxosServiceMessage{MSG_OSD_BEACON, 0,
+			  HEAD_VERSION, COMPAT_VERSION}
+  {}
+  MOSDBeacon(epoch_t e, epoch_t min_lec, utime_t ls, int interval)
+    : PaxosServiceMessage{MSG_OSD_BEACON, e,
+			  HEAD_VERSION, COMPAT_VERSION},
+      min_last_epoch_clean(min_lec),
+      last_purged_snaps_scrub(ls),
+      osd_beacon_report_interval(interval)
+  {}
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(pgs, payload);
+    encode(min_last_epoch_clean, payload);
+    encode(last_purged_snaps_scrub, payload);
+    encode(osd_beacon_report_interval, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    paxos_decode(p);
+    decode(pgs, p);
+    decode(min_last_epoch_clean, p);
+    if (header.version >= 2) {
+      decode(last_purged_snaps_scrub, p);
+    }
+    if (header.version >= 3) {
+      decode(osd_beacon_report_interval, p);
+    } else {
+      osd_beacon_report_interval = 0;
+    }
+  }
+  std::string_view get_type_name() const override { return "osd_beacon"; }
+  void print(std::ostream &out) const {
+    out << get_type_name()
+        << "(pgs " << pgs
+        << " lec " << min_last_epoch_clean
+        << " last_purged_snaps_scrub " << last_purged_snaps_scrub
+        << " osd_beacon_report_interval " << osd_beacon_report_interval
+        << " v" << version << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDBoot.h b/src/messages/MOSDBoot.h
new file mode 100644
index 000000000..f28a11c38
--- /dev/null
+++ b/src/messages/MOSDBoot.h
@@ -0,0 +1,98 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDBOOT_H
+#define CEPH_MOSDBOOT_H
+
+#include "messages/PaxosServiceMessage.h"
+
+#include "include/ceph_features.h"
+#include "include/types.h"
+#include "osd/osd_types.h"
+
+class MOSDBoot final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 7;
+  static constexpr int COMPAT_VERSION = 7;
+
+ public:
+  OSDSuperblock sb;
+  entity_addrvec_t hb_back_addrs, hb_front_addrs;
+  entity_addrvec_t cluster_addrs;
+  epoch_t boot_epoch;  // last epoch this daemon was added to the map (if any)
+  std::map<std::string,std::string> metadata; ///< misc metadata about this osd
+  uint64_t osd_features;
+
+  MOSDBoot()
+    : PaxosServiceMessage{MSG_OSD_BOOT, 0, HEAD_VERSION, COMPAT_VERSION},
+      boot_epoch(0), osd_features(0)
+  { }
+  MOSDBoot(const OSDSuperblock& s, epoch_t e, epoch_t be,
+	   const entity_addrvec_t& hb_back_addr_ref,
+	   const entity_addrvec_t& hb_front_addr_ref,
+           const entity_addrvec_t& cluster_addr_ref,
+	   uint64_t feat)
+    : PaxosServiceMessage{MSG_OSD_BOOT, e, HEAD_VERSION, COMPAT_VERSION},
+      sb(s),
+      hb_back_addrs(hb_back_addr_ref),
+      hb_front_addrs(hb_front_addr_ref),
+      cluster_addrs(cluster_addr_ref),
+      boot_epoch(be),
+      osd_features(feat)
+  { }
+  
+private:
+  ~MOSDBoot() final { }
+
+public:
+  std::string_view get_type_name() const override { return "osd_boot"; }
+  void print(std::ostream& out) const override {
+    out << "osd_boot(osd." << sb.whoami << " booted " << boot_epoch
+	<< " features " << osd_features
+	<< " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    using ceph::encode;
+    paxos_encode();
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    encode(sb, payload);
+    encode(hb_back_addrs, payload, features);
+    encode(cluster_addrs, payload, features);
+    encode(boot_epoch, payload);
+    encode(hb_front_addrs, payload, features);
+    encode(metadata, payload);
+    encode(osd_features, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    paxos_decode(p);
+    assert(header.version >= 7);
+    decode(sb, p);
+    decode(hb_back_addrs, p);
+    decode(cluster_addrs, p);
+    decode(boot_epoch, p);
+    decode(hb_front_addrs, p);
+    decode(metadata, p);
+    decode(osd_features, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDECSubOpRead.h b/src/messages/MOSDECSubOpRead.h
new file mode 100644
index 000000000..254357f13
--- /dev/null
+++ b/src/messages/MOSDECSubOpRead.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDECSUBOPREAD_H
+#define MOSDECSUBOPREAD_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/ECMsgTypes.h"
+
+class MOSDECSubOpRead : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  ECSubRead op;
+
+  int get_cost() const override {
+    return 0;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDECSubOpRead()
+    : MOSDFastDispatchOp{MSG_OSD_EC_READ, HEAD_VERSION, COMPAT_VERSION}
+    {}
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    if (header.version >= 3) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload, features);
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDECSubOpRead"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDECSubOpRead(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << op;
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDECSubOpReadReply.h b/src/messages/MOSDECSubOpReadReply.h
new file mode 100644
index 000000000..b71c22db4
--- /dev/null
+++ b/src/messages/MOSDECSubOpReadReply.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDECSUBOPREADREPLY_H
+#define MOSDECSUBOPREADREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/ECMsgTypes.h"
+
+class MOSDECSubOpReadReply : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  ECSubReadReply op;
+
+  int get_cost() const override {
+    return 0;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDECSubOpReadReply()
+    : MOSDFastDispatchOp{MSG_OSD_EC_READ_REPLY, HEAD_VERSION, COMPAT_VERSION}
+    {}
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDECSubOpReadReply"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDECSubOpReadReply(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << op;
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDECSubOpWrite.h b/src/messages/MOSDECSubOpWrite.h
new file mode 100644
index 000000000..e1e37d096
--- /dev/null
+++ b/src/messages/MOSDECSubOpWrite.h
@@ -0,0 +1,93 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDECSUBOPWRITE_H
+#define MOSDECSUBOPWRITE_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/ECMsgTypes.h"
+
+class MOSDECSubOpWrite : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  ECSubWrite op;
+
+  int get_cost() const override {
+    return 0;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDECSubOpWrite()
+    : MOSDFastDispatchOp{MSG_OSD_EC_WRITE, HEAD_VERSION, COMPAT_VERSION}
+    {}
+  MOSDECSubOpWrite(ECSubWrite &in_op)
+    : MOSDFastDispatchOp{MSG_OSD_EC_WRITE, HEAD_VERSION, COMPAT_VERSION} {
+    op.claim(in_op);
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDECSubOpWrite"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDECSubOpWrite(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << op;
+    out << ")";
+  }
+
+  void clear_buffers() override {
+    op.t = ObjectStore::Transaction();
+    op.log_entries.clear();
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDECSubOpWriteReply.h b/src/messages/MOSDECSubOpWriteReply.h
new file mode 100644
index 000000000..7a813d283
--- /dev/null
+++ b/src/messages/MOSDECSubOpWriteReply.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDECSUBOPWRITEREPLY_H
+#define MOSDECSUBOPWRITEREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+#include "osd/ECMsgTypes.h"
+
+class MOSDECSubOpWriteReply : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  ECSubWriteReply op;
+
+  int get_cost() const override {
+    return 0;
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDECSubOpWriteReply()
+    : MOSDFastDispatchOp{MSG_OSD_EC_WRITE_REPLY, HEAD_VERSION, COMPAT_VERSION}
+  {}
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDECSubOpWriteReply"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDECSubOpWriteReply(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << op;
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDFailure.h b/src/messages/MOSDFailure.h
new file mode 100644
index 000000000..508cc84d3
--- /dev/null
+++ b/src/messages/MOSDFailure.h
@@ -0,0 +1,114 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDFAILURE_H
+#define CEPH_MOSDFAILURE_H
+
+#include "messages/PaxosServiceMessage.h"
+
+
+class MOSDFailure final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 4;
+
+ public:
+  enum {
+    FLAG_ALIVE = 0,      // use this on its own to mark as "I'm still alive"
+    FLAG_FAILED = 1,     // if set, failure; if not, recovery
+    FLAG_IMMEDIATE = 2,  // known failure, not a timeout
+  };
+  
+  uuid_d fsid;
+  int32_t target_osd;
+  entity_addrvec_t target_addrs;
+  __u8 flags = 0;
+  epoch_t epoch = 0;
+  int32_t failed_for = 0;  // known to be failed since at least this long
+
+  MOSDFailure() : PaxosServiceMessage(MSG_OSD_FAILURE, 0, HEAD_VERSION) { }
+  MOSDFailure(const uuid_d &fs, int osd, const entity_addrvec_t& av,
+	      int duration, epoch_t e)
+    : PaxosServiceMessage(MSG_OSD_FAILURE, e, HEAD_VERSION, COMPAT_VERSION),
+      fsid(fs),
+      target_osd(osd),
+      target_addrs(av),
+      flags(FLAG_FAILED),
+      epoch(e), failed_for(duration) { }
+  MOSDFailure(const uuid_d &fs, int osd, const entity_addrvec_t& av,
+	      int duration,
+              epoch_t e, __u8 extra_flags)
+    : PaxosServiceMessage(MSG_OSD_FAILURE, e, HEAD_VERSION, COMPAT_VERSION),
+      fsid(fs),
+      target_osd(osd),
+      target_addrs(av),
+      flags(extra_flags),
+      epoch(e), failed_for(duration) { }
+private:
+  ~MOSDFailure() final {}
+
+public:
+  int get_target_osd() { return target_osd; }
+  const entity_addrvec_t& get_target_addrs() { return target_addrs; }
+  bool if_osd_failed() const { 
+    return flags & FLAG_FAILED; 
+  }
+  bool is_immediate() const { 
+    return flags & FLAG_IMMEDIATE; 
+  }
+  epoch_t get_epoch() const { return epoch; }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    assert(header.version >= 4);
+    decode(target_osd, p);
+    decode(target_addrs, p);
+    decode(epoch, p);
+    decode(flags, p);
+    decode(failed_for, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(fsid, payload);
+    encode(target_osd, payload, features);
+    encode(target_addrs, payload, features);
+    encode(epoch, payload);
+    encode(flags, payload);
+    encode(failed_for, payload);
+  }
+
+  std::string_view get_type_name() const override { return "osd_failure"; }
+  void print(std::ostream& out) const override {
+    out << "osd_failure("
+	<< (if_osd_failed() ? "failed " : "recovered ")
+	<< (is_immediate() ? "immediate " : "timeout ")
+	<< "osd." << target_osd << " " << target_addrs
+	<< " for " << failed_for << "sec e" << epoch
+	<< " v" << version << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDFastDispatchOp.h b/src/messages/MOSDFastDispatchOp.h
new file mode 100644
index 000000000..d1103fb88
--- /dev/null
+++ b/src/messages/MOSDFastDispatchOp.h
@@ -0,0 +1,22 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MOSDFASTDISPATCHOP_H
+#define CEPH_MOSDFASTDISPATCHOP_H
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class MOSDFastDispatchOp : public Message {
+public:
+  MOSDFastDispatchOp(int t, int version, int compat_version)
+    : Message{t, version, compat_version}
+  {}
+  virtual epoch_t get_map_epoch() const = 0;
+  virtual epoch_t get_min_epoch() const {
+    return get_map_epoch();
+  }
+  virtual spg_t get_spg() const = 0;
+};
+
+#endif
diff --git a/src/messages/MOSDForceRecovery.h b/src/messages/MOSDForceRecovery.h
new file mode 100644
index 000000000..2d9ccc0e0
--- /dev/null
+++ b/src/messages/MOSDForceRecovery.h
@@ -0,0 +1,114 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 OVH
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDFORCERECOVERY_H
+#define CEPH_MOSDFORCERECOVERY_H
+
+#include "msg/Message.h"
+
+/*
+ * instruct an OSD to boost/unboost recovery/backfill priority of some or all pg(s)
+ */
+
+// boost priority of recovery
+static const int OFR_RECOVERY = 1;
+
+// boost priority of backfill
+static const int OFR_BACKFILL = 2;
+
+// cancel priority boost, requeue if necessary
+static const int OFR_CANCEL = 4;
+
+class MOSDForceRecovery final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+  uuid_d fsid;
+  std::vector<spg_t> forced_pgs;
+  uint8_t options = 0;
+
+  MOSDForceRecovery() : Message{MSG_OSD_FORCE_RECOVERY, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDForceRecovery(const uuid_d& f, char opts) :
+    Message{MSG_OSD_FORCE_RECOVERY, HEAD_VERSION, COMPAT_VERSION},
+    fsid(f), options(opts) {}
+  MOSDForceRecovery(const uuid_d& f, std::vector<spg_t>& pgs, char opts) :
+    Message{MSG_OSD_FORCE_RECOVERY, HEAD_VERSION, COMPAT_VERSION},
+    fsid(f), forced_pgs(pgs), options(opts) {}
+private:
+  ~MOSDForceRecovery() final {}
+
+public:
+  std::string_view get_type_name() const { return "force_recovery"; }
+  void print(std::ostream& out) const {
+    out << "force_recovery(";
+    if (forced_pgs.empty())
+      out << "osd";
+    else
+      out << forced_pgs;
+    if (options & OFR_RECOVERY)
+      out << " recovery";
+    if (options & OFR_BACKFILL)
+       out << " backfill";
+    if (options & OFR_CANCEL)
+       out << " cancel";
+     out << ")";
+  }
+
+  void encode_payload(uint64_t features) {
+    using ceph::encode;
+    if (!HAVE_FEATURE(features, SERVER_MIMIC)) {
+      header.version = 1;
+      header.compat_version = 1;
+      std::vector<pg_t> pgs;
+      for (auto pgid : forced_pgs) {
+	pgs.push_back(pgid.pgid);
+      }
+      encode(fsid, payload);
+      encode(pgs, payload);
+      encode(options, payload);
+      return;
+    }
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(fsid, payload);
+    encode(forced_pgs, payload);
+    encode(options, payload);
+  }
+  void decode_payload() {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    if (header.version == 1) {
+      std::vector<pg_t> pgs;
+      decode(fsid, p);
+      decode(pgs, p);
+      decode(options, p);
+      for (auto pg : pgs) {
+	// note: this only works with replicated pools.  if a pre-mimic mon
+	// tries to force a mimic+ osd on an ec pool it will not work.
+	forced_pgs.push_back(spg_t(pg));
+      }
+      return;
+    }
+    decode(fsid, p);
+    decode(forced_pgs, p);
+    decode(options, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif /* CEPH_MOSDFORCERECOVERY_H_ */
diff --git a/src/messages/MOSDFull.h b/src/messages/MOSDFull.h
new file mode 100644
index 000000000..89f5b8402
--- /dev/null
+++ b/src/messages/MOSDFull.h
@@ -0,0 +1,54 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MOSDFULL_H
+#define CEPH_MOSDFULL_H
+
+#include "messages/PaxosServiceMessage.h"
+#include "osd/OSDMap.h"
+
+// tell the mon to update the full/nearfull bits.  note that in the
+// future this message could be generalized to other state bits, but
+// for now name it for its sole application.
+
+class MOSDFull final : public PaxosServiceMessage {
+public:
+  epoch_t map_epoch = 0;
+  uint32_t state = 0;
+
+private:
+  ~MOSDFull() final {}
+
+public:
+  MOSDFull(epoch_t e, unsigned s)
+    : PaxosServiceMessage{MSG_OSD_FULL, e}, map_epoch(e), state(s) { }
+  MOSDFull()
+    : PaxosServiceMessage{MSG_OSD_FULL, 0} {}
+
+public:
+  void encode_payload(uint64_t features) {
+    using ceph::encode;
+    paxos_encode();
+    encode(map_epoch, payload);
+    encode(state, payload);
+  }
+  void decode_payload() {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(map_epoch, p);
+    decode(state, p);
+  }
+
+  std::string_view get_type_name() const { return "osd_full"; }
+  void print(std::ostream &out) const {
+    std::set<std::string> states;
+    OSDMap::calc_state_set(state, states);
+    out << "osd_full(e" << map_epoch << " " << states << " v" << version << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDMap.h b/src/messages/MOSDMap.h
new file mode 100644
index 000000000..c9dd6991f
--- /dev/null
+++ b/src/messages/MOSDMap.h
@@ -0,0 +1,178 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDMAP_H
+#define CEPH_MOSDMAP_H
+
+#include "msg/Message.h"
+#include "osd/OSDMap.h"
+#include "include/ceph_features.h"
+
+class MOSDMap final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 3;
+
+public:
+  uuid_d fsid;
+  uint64_t encode_features = 0;
+  std::map<epoch_t, ceph::buffer::list> maps;
+  std::map<epoch_t, ceph::buffer::list> incremental_maps;
+  /**
+   * cluster_osdmap_trim_lower_bound
+   *
+   * Encodes a lower bound on the monitor's osdmap trim bound.  Recipients
+   * can safely trim up to this bound.  The sender stores maps back to
+   * cluster_osdmap_trim_lower_bound.
+   *
+   * This field was formerly named oldest_map and encoded the oldest map
+   * stored by the sender.  The primary usage of this field, however, was to
+   * allow the recipient to trim.  The secondary usage was to inform the
+   * recipient of how many maps the sender stored in case it needed to request
+   * more.  For both purposes, it should be safe for an older OSD to interpret
+   * this field as oldest_map, and it should be safe for a new osd to interpret
+   * the oldest_map field sent by an older osd as
+   * cluster_osdmap_trim_lower_bound.
+   * See bug https://tracker.ceph.com/issues/49689
+   */
+  epoch_t cluster_osdmap_trim_lower_bound = 0;
+  epoch_t newest_map = 0;
+
+  epoch_t get_first() const {
+    epoch_t e = 0;
+    auto i = maps.cbegin();
+    if (i != maps.cend())  e = i->first;
+    i = incremental_maps.begin();    
+    if (i != incremental_maps.end() &&
+        (e == 0 || i->first < e)) e = i->first;
+    return e;
+  }
+  epoch_t get_last() const {
+    epoch_t e = 0;
+    auto i = maps.crbegin();
+    if (i != maps.crend())  e = i->first;
+    i = incremental_maps.rbegin();    
+    if (i != incremental_maps.rend() &&
+        (e == 0 || i->first > e)) e = i->first;
+    return e;
+  }
+
+  MOSDMap() : Message{CEPH_MSG_OSD_MAP, HEAD_VERSION, COMPAT_VERSION} { }
+  MOSDMap(const uuid_d &f, const uint64_t features)
+    : Message{CEPH_MSG_OSD_MAP, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), encode_features(features),
+      cluster_osdmap_trim_lower_bound(0), newest_map(0) { }
+private:
+  ~MOSDMap() final {}
+public:
+  // marshalling
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(incremental_maps, p);
+    decode(maps, p);
+    if (header.version >= 2) {
+      decode(cluster_osdmap_trim_lower_bound, p);
+      decode(newest_map, p);
+    } else {
+      cluster_osdmap_trim_lower_bound = 0;
+      newest_map = 0;
+    }
+    if (header.version >= 4) {
+      // removed in octopus
+      mempool::osdmap::map<int64_t,snap_interval_set_t> gap_removed_snaps;
+      decode(gap_removed_snaps, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(fsid, payload);
+    if (OSDMap::get_significant_features(encode_features) !=
+         OSDMap::get_significant_features(features)) {
+      if ((features & CEPH_FEATURE_PGID64) == 0 ||
+	  (features & CEPH_FEATURE_PGPOOL3) == 0) {
+	header.version = 1;  // old old_client version
+	header.compat_version = 1;
+      } else if ((features & CEPH_FEATURE_OSDENC) == 0) {
+	header.version = 2;  // old pg_pool_t
+	header.compat_version = 2;
+      }
+
+      // reencode maps using old format
+      //
+      // FIXME: this can probably be done more efficiently higher up
+      // the stack, or maybe replaced with something that only
+      // includes the pools the client cares about.
+      for (auto p = incremental_maps.begin(); p != incremental_maps.end(); ++p) {
+	OSDMap::Incremental inc;
+	auto q = p->second.cbegin();
+	inc.decode(q);
+	// always encode with subset of osdmaps canonical features
+	uint64_t f = inc.encode_features & features;
+	p->second.clear();
+	if (inc.fullmap.length()) {
+	  // embedded full std::map?
+	  OSDMap m;
+	  m.decode(inc.fullmap);
+	  inc.fullmap.clear();
+	  m.encode(inc.fullmap, f | CEPH_FEATURE_RESERVED);
+	}
+	if (inc.crush.length()) {
+	  // embedded crush std::map
+	  CrushWrapper c;
+	  auto p = inc.crush.cbegin();
+	  c.decode(p);
+	  inc.crush.clear();
+	  c.encode(inc.crush, f);
+	}
+	inc.encode(p->second, f | CEPH_FEATURE_RESERVED);
+      }
+      for (auto p = maps.begin(); p != maps.end(); ++p) {
+	OSDMap m;
+	m.decode(p->second);
+	// always encode with subset of osdmaps canonical features
+	uint64_t f = m.get_encoding_features() & features;
+	p->second.clear();
+	m.encode(p->second, f | CEPH_FEATURE_RESERVED);
+      }
+    }
+    encode(incremental_maps, payload);
+    encode(maps, payload);
+    if (header.version >= 2) {
+      encode(cluster_osdmap_trim_lower_bound, payload);
+      encode(newest_map, payload);
+    }
+    if (header.version >= 4) {
+      encode((uint32_t)0, payload);
+    }
+  }
+
+  std::string_view get_type_name() const override { return "osdmap"; }
+  void print(std::ostream& out) const override {
+    out << "osd_map(" << get_first() << ".." << get_last();
+    if (cluster_osdmap_trim_lower_bound || newest_map)
+      out << " src has " << cluster_osdmap_trim_lower_bound
+          << ".." << newest_map;
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDMarkMeDead.h b/src/messages/MOSDMarkMeDead.h
new file mode 100644
index 000000000..35f988055
--- /dev/null
+++ b/src/messages/MOSDMarkMeDead.h
@@ -0,0 +1,63 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDMarkMeDead final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+ public:
+  uuid_d fsid;
+  int32_t target_osd;
+  epoch_t epoch = 0;
+
+  MOSDMarkMeDead()
+    : PaxosServiceMessage{MSG_OSD_MARK_ME_DEAD, 0,
+			  HEAD_VERSION, COMPAT_VERSION} { }
+  MOSDMarkMeDead(const uuid_d &fs, int osd,
+		 epoch_t e)
+    : PaxosServiceMessage{MSG_OSD_MARK_ME_DEAD, e,
+			  HEAD_VERSION, COMPAT_VERSION},
+      fsid(fs), target_osd(osd),
+      epoch(e) {}
+ private:
+  ~MOSDMarkMeDead() final {}
+
+public:
+  epoch_t get_epoch() const { return epoch; }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(target_osd, p);
+    decode(epoch, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(fsid, payload);
+    encode(target_osd, payload, features);
+    encode(epoch, payload);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDMarkMeDead"; }
+  void print(std::ostream& out) const override {
+    out << "MOSDMarkMeDead("
+	<< "osd." << target_osd
+	<< ", epoch " << epoch
+	<< ", fsid=" << fsid
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDMarkMeDown.h b/src/messages/MOSDMarkMeDown.h
new file mode 100644
index 000000000..88d618613
--- /dev/null
+++ b/src/messages/MOSDMarkMeDown.h
@@ -0,0 +1,97 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MOSDMARKMEDOWN_H
+#define CEPH_MOSDMARKMEDOWN_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDMarkMeDown final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 3;
+
+ public:
+  uuid_d fsid;
+  int32_t target_osd;
+  entity_addrvec_t target_addrs;
+  epoch_t epoch = 0;
+  bool request_ack = false;          // ack requested
+  bool down_and_dead = false;        // mark down and dead
+
+  MOSDMarkMeDown()
+    : PaxosServiceMessage{MSG_OSD_MARK_ME_DOWN, 0,
+			  HEAD_VERSION, COMPAT_VERSION} { }
+  MOSDMarkMeDown(const uuid_d &fs, int osd, const entity_addrvec_t& av,
+		 epoch_t e, bool request_ack)
+    : PaxosServiceMessage{MSG_OSD_MARK_ME_DOWN, e,
+			  HEAD_VERSION, COMPAT_VERSION},
+      fsid(fs), target_osd(osd), target_addrs(av),
+      epoch(e), request_ack(request_ack) {}
+  MOSDMarkMeDown(const uuid_d &fs, int osd, const entity_addrvec_t& av,
+		 epoch_t e, bool request_ack, bool down_and_dead)
+    : PaxosServiceMessage{MSG_OSD_MARK_ME_DOWN, e,
+			  HEAD_VERSION, COMPAT_VERSION},
+      fsid(fs), target_osd(osd), target_addrs(av),
+      epoch(e), request_ack(request_ack), down_and_dead(down_and_dead) {}
+ private:
+  ~MOSDMarkMeDown() final {}
+
+public: 
+  epoch_t get_epoch() const { return epoch; }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    assert(header.version >= 3);
+    decode(fsid, p);
+    decode(target_osd, p);
+    decode(target_addrs, p);
+    decode(epoch, p);
+    decode(request_ack, p);
+    if(header.version >= 4)
+      decode(down_and_dead, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    header.version = HEAD_VERSION;
+    header.compat_version = COMPAT_VERSION;
+    encode(fsid, payload);
+    encode(target_osd, payload, features);
+    encode(target_addrs, payload, features);
+    encode(epoch, payload);
+    encode(request_ack, payload);
+    encode(down_and_dead, payload);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDMarkMeDown"; }
+  void print(std::ostream& out) const override {
+    out << "MOSDMarkMeDown("
+	<< "request_ack=" << request_ack
+	<< ", down_and_dead=" << down_and_dead
+	<< ", osd." << target_osd
+	<< ", " << target_addrs
+	<< ", fsid=" << fsid
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDOp.h b/src/messages/MOSDOp.h
new file mode 100644
index 000000000..97432d118
--- /dev/null
+++ b/src/messages/MOSDOp.h
@@ -0,0 +1,612 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDOP_H
+#define CEPH_MOSDOP_H
+
+#include <atomic>
+
+#include "MOSDFastDispatchOp.h"
+#include "include/ceph_features.h"
+#include "common/hobject.h"
+
+/*
+ * OSD op
+ *
+ * oid - object id
+ * op  - OSD_OP_DELETE, etc.
+ *
+ */
+
+class MOSDOpReply;
+
+namespace _mosdop {
+template<typename V>
+class MOSDOp final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 8;
+  static constexpr int COMPAT_VERSION = 3;
+
+private:
+  uint32_t client_inc = 0;
+  __u32 osdmap_epoch = 0;
+  __u32 flags = 0;
+  utime_t mtime;
+  int32_t retry_attempt = -1;   // 0 is first attempt.  -1 if we don't know.
+
+  hobject_t hobj;
+  spg_t pgid;
+  ceph::buffer::list::const_iterator p;
+  // Decoding flags. Decoding is only needed for messages caught by pipe reader.
+  // Transition from true -> false without locks being held
+  // Can never see final_decode_needed == false and partial_decode_needed == true
+  std::atomic<bool> partial_decode_needed;
+  std::atomic<bool> final_decode_needed;
+  //
+public:
+  V ops;
+private:
+  snapid_t snap_seq;
+  std::vector<snapid_t> snaps;
+
+  uint64_t features;
+  bool bdata_encode;
+  osd_reqid_t reqid; // reqid explicitly set by sender
+
+public:
+  friend MOSDOpReply;
+
+  ceph_tid_t get_client_tid() { return header.tid; }
+  void set_snapid(const snapid_t& s) {
+    hobj.snap = s;
+  }
+  void set_snaps(const std::vector<snapid_t>& i) {
+    snaps = i;
+  }
+  void set_snap_seq(const snapid_t& s) { snap_seq = s; }
+  void set_reqid(const osd_reqid_t rid) {
+    reqid = rid;
+  }
+  void set_spg(spg_t p) {
+    pgid = p;
+  }
+
+  // Fields decoded in partial decoding
+  pg_t get_pg() const {
+    ceph_assert(!partial_decode_needed);
+    return pgid.pgid;
+  }
+  spg_t get_spg() const override {
+    ceph_assert(!partial_decode_needed);
+    return pgid;
+  }
+  pg_t get_raw_pg() const {
+    ceph_assert(!partial_decode_needed);
+    return pg_t(hobj.get_hash(), pgid.pgid.pool());
+  }
+  epoch_t get_map_epoch() const override {
+    ceph_assert(!partial_decode_needed);
+    return osdmap_epoch;
+  }
+  int get_flags() const {
+    ceph_assert(!partial_decode_needed);
+    return flags;
+  }
+  osd_reqid_t get_reqid() const {
+    ceph_assert(!partial_decode_needed);
+    if (reqid.name != entity_name_t() || reqid.tid != 0) {
+      return reqid;
+    } else {
+      if (!final_decode_needed)
+	ceph_assert(reqid.inc == (int32_t)client_inc);  // decode() should have done this
+      return osd_reqid_t(get_orig_source(),
+                         reqid.inc,
+			 header.tid);
+    }
+  }
+
+  // Fields decoded in final decoding
+  int get_client_inc() const {
+    ceph_assert(!final_decode_needed);
+    return client_inc;
+  }
+  utime_t get_mtime() const {
+    ceph_assert(!final_decode_needed);
+    return mtime;
+  }
+  object_locator_t get_object_locator() const {
+    ceph_assert(!final_decode_needed);
+    if (hobj.oid.name.empty())
+      return object_locator_t(hobj.pool, hobj.nspace, hobj.get_hash());
+    else
+      return object_locator_t(hobj);
+  }
+  const object_t& get_oid() const {
+    ceph_assert(!final_decode_needed);
+    return hobj.oid;
+  }
+  const hobject_t &get_hobj() const {
+    return hobj;
+  }
+  snapid_t get_snapid() const {
+    ceph_assert(!final_decode_needed);
+    return hobj.snap;
+  }
+  const snapid_t& get_snap_seq() const {
+    ceph_assert(!final_decode_needed);
+    return snap_seq;
+  }
+  const std::vector<snapid_t> &get_snaps() const {
+    ceph_assert(!final_decode_needed);
+    return snaps;
+  }
+
+  /**
+   * get retry attempt
+   *
+   * 0 is the first attempt.
+   *
+   * @return retry attempt, or -1 if we don't know
+   */
+  int get_retry_attempt() const {
+    return retry_attempt;
+  }
+  uint64_t get_features() const {
+    if (features)
+      return features;
+#ifdef WITH_SEASTAR
+    // In crimson, conn is independently maintained outside Message.
+    ceph_abort();
+#endif
+    return get_connection()->get_features();
+  }
+
+  MOSDOp()
+    : MOSDFastDispatchOp(CEPH_MSG_OSD_OP, HEAD_VERSION, COMPAT_VERSION),
+      partial_decode_needed(true),
+      final_decode_needed(true),
+      bdata_encode(false) { }
+  MOSDOp(int inc, long tid, const hobject_t& ho, spg_t& _pgid,
+	 epoch_t _osdmap_epoch,
+	 int _flags, uint64_t feat)
+    : MOSDFastDispatchOp(CEPH_MSG_OSD_OP, HEAD_VERSION, COMPAT_VERSION),
+      client_inc(inc),
+      osdmap_epoch(_osdmap_epoch), flags(_flags), retry_attempt(-1),
+      hobj(ho),
+      pgid(_pgid),
+      partial_decode_needed(false),
+      final_decode_needed(false),
+      features(feat),
+      bdata_encode(false) {
+    set_tid(tid);
+
+    // also put the client_inc in reqid.inc, so that get_reqid() can
+    // be used before the full message is decoded.
+    reqid.inc = inc;
+  }
+private:
+  ~MOSDOp() final {}
+
+public:
+  void set_mtime(utime_t mt) { mtime = mt; }
+  void set_mtime(ceph::real_time mt) {
+    mtime = ceph::real_clock::to_timespec(mt);
+  }
+
+  // ops
+  void add_simple_op(int o, uint64_t off, uint64_t len) {
+    OSDOp osd_op;
+    osd_op.op.op = o;
+    osd_op.op.extent.offset = off;
+    osd_op.op.extent.length = len;
+    ops.push_back(osd_op);
+  }
+  void write(uint64_t off, uint64_t len, ceph::buffer::list& bl) {
+    add_simple_op(CEPH_OSD_OP_WRITE, off, len);
+    data = std::move(bl);
+    header.data_off = off;
+  }
+  void writefull(ceph::buffer::list& bl) {
+    add_simple_op(CEPH_OSD_OP_WRITEFULL, 0, bl.length());
+    data = std::move(bl);
+    header.data_off = 0;
+  }
+  void zero(uint64_t off, uint64_t len) {
+    add_simple_op(CEPH_OSD_OP_ZERO, off, len);
+  }
+  void truncate(uint64_t off) {
+    add_simple_op(CEPH_OSD_OP_TRUNCATE, off, 0);
+  }
+  void remove() {
+    add_simple_op(CEPH_OSD_OP_DELETE, 0, 0);
+  }
+
+  void read(uint64_t off, uint64_t len) {
+    add_simple_op(CEPH_OSD_OP_READ, off, len);
+  }
+  void stat() {
+    add_simple_op(CEPH_OSD_OP_STAT, 0, 0);
+  }
+
+  bool has_flag(__u32 flag) const { return flags & flag; };
+
+  bool is_retry_attempt() const { return flags & CEPH_OSD_FLAG_RETRY; }
+  void set_retry_attempt(unsigned a) { 
+    if (a)
+      flags |= CEPH_OSD_FLAG_RETRY;
+    else
+      flags &= ~CEPH_OSD_FLAG_RETRY;
+    retry_attempt = a;
+  }
+
+  // marshalling
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if( false == bdata_encode ) {
+      OSDOp::merge_osd_op_vector_in_data(ops, data);
+      bdata_encode = true;
+    }
+
+    if ((features & CEPH_FEATURE_OBJECTLOCATOR) == 0) {
+      // here is the old structure we are encoding to: //
+#if 0
+struct ceph_osd_request_head {
+	ceph_le32 client_inc;              /* client incarnation */
+	struct ceph_object_layout layout;  /* pgid */
+	ceph_le32 osdmap_epoch;            /* client's osdmap epoch */
+
+	ceph_le32 flags;
+
+	struct ceph_timespec mtime;        /* for mutations only */
+	struct ceph_eversion reassert_version; /* if we are replaying op */
+
+	ceph_le32 object_len;     /* length of object name */
+
+	ceph_le64 snapid;         /* snapid to read */
+	ceph_le64 snap_seq;       /* writer's snap context */
+	ceph_le32 num_snaps;
+
+	ceph_le16 num_ops;
+	struct ceph_osd_op ops[];  /* followed by ops[], obj, ticket, snaps */
+} __attribute__ ((packed));
+#endif
+      header.version = 1;
+
+      encode(client_inc, payload);
+
+      __u32 su = 0;
+      encode(get_raw_pg(), payload);
+      encode(su, payload);
+
+      encode(osdmap_epoch, payload);
+      encode(flags, payload);
+      encode(mtime, payload);
+      encode(eversion_t(), payload);  // reassert_version
+
+      __u32 oid_len = hobj.oid.name.length();
+      encode(oid_len, payload);
+      encode(hobj.snap, payload);
+      encode(snap_seq, payload);
+      __u32 num_snaps = snaps.size();
+      encode(num_snaps, payload);
+      
+      //::encode(ops, payload);
+      __u16 num_ops = ops.size();
+      encode(num_ops, payload);
+      for (unsigned i = 0; i < ops.size(); i++)
+	encode(ops[i].op, payload);
+
+      ceph::encode_nohead(hobj.oid.name, payload);
+      ceph::encode_nohead(snaps, payload);
+    } else if ((features & CEPH_FEATURE_NEW_OSDOP_ENCODING) == 0) {
+      header.version = 6;
+      encode(client_inc, payload);
+      encode(osdmap_epoch, payload);
+      encode(flags, payload);
+      encode(mtime, payload);
+      encode(eversion_t(), payload); // reassert_version
+      encode(get_object_locator(), payload);
+      encode(get_raw_pg(), payload);
+
+      encode(hobj.oid, payload);
+
+      __u16 num_ops = ops.size();
+      encode(num_ops, payload);
+      for (unsigned i = 0; i < ops.size(); i++)
+        encode(ops[i].op, payload);
+
+      encode(hobj.snap, payload);
+      encode(snap_seq, payload);
+      encode(snaps, payload);
+
+      encode(retry_attempt, payload);
+      encode(features, payload);
+      if (reqid.name != entity_name_t() || reqid.tid != 0) {
+	encode(reqid, payload);
+      } else {
+	// don't include client_inc in the reqid for the legacy v6
+	// encoding or else we'll confuse older peers.
+	encode(osd_reqid_t(), payload);
+      }
+    } else if (!HAVE_FEATURE(features, RESEND_ON_SPLIT)) {
+      // reordered, v7 message encoding
+      header.version = 7;
+      encode(get_raw_pg(), payload);
+      encode(osdmap_epoch, payload);
+      encode(flags, payload);
+      encode(eversion_t(), payload); // reassert_version
+      encode(reqid, payload);
+      encode(client_inc, payload);
+      encode(mtime, payload);
+      encode(get_object_locator(), payload);
+      encode(hobj.oid, payload);
+
+      __u16 num_ops = ops.size();
+      encode(num_ops, payload);
+      for (unsigned i = 0; i < ops.size(); i++)
+	encode(ops[i].op, payload);
+
+      encode(hobj.snap, payload);
+      encode(snap_seq, payload);
+      encode(snaps, payload);
+
+      encode(retry_attempt, payload);
+      encode(features, payload);
+    } else {
+      // latest v8 encoding with hobject_t hash separate from pgid, no
+      // reassert version
+      header.version = HEAD_VERSION;
+
+      encode(pgid, payload);
+      encode(hobj.get_hash(), payload);
+      encode(osdmap_epoch, payload);
+      encode(flags, payload);
+      encode(reqid, payload);
+      encode_trace(payload, features);
+
+      // -- above decoded up front; below decoded post-dispatch thread --
+
+      encode(client_inc, payload);
+      encode(mtime, payload);
+      encode(get_object_locator(), payload);
+      encode(hobj.oid, payload);
+
+      __u16 num_ops = ops.size();
+      encode(num_ops, payload);
+      for (unsigned i = 0; i < ops.size(); i++)
+	encode(ops[i].op, payload);
+
+      encode(hobj.snap, payload);
+      encode(snap_seq, payload);
+      encode(snaps, payload);
+
+      encode(retry_attempt, payload);
+      encode(features, payload);
+    }
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    ceph_assert(partial_decode_needed && final_decode_needed);
+    p = std::cbegin(payload);
+
+    // Always keep here the newest version of decoding order/rule
+    if (header.version == HEAD_VERSION) {
+      decode(pgid, p);      // actual pgid
+      uint32_t hash;
+      decode(hash, p); // raw hash value
+      hobj.set_hash(hash);
+      decode(osdmap_epoch, p);
+      decode(flags, p);
+      decode(reqid, p);
+      decode_trace(p);
+    } else if (header.version == 7) {
+      decode(pgid.pgid, p);      // raw pgid
+      hobj.set_hash(pgid.pgid.ps());
+      decode(osdmap_epoch, p);
+      decode(flags, p);
+      eversion_t reassert_version;
+      decode(reassert_version, p);
+      decode(reqid, p);
+    } else if (header.version < 2) {
+      // old decode
+      decode(client_inc, p);
+
+      old_pg_t opgid;
+      ceph::decode_raw(opgid, p);
+      pgid.pgid = opgid;
+
+      __u32 su;
+      decode(su, p);
+
+      decode(osdmap_epoch, p);
+      decode(flags, p);
+      decode(mtime, p);
+      eversion_t reassert_version;
+      decode(reassert_version, p);
+
+      __u32 oid_len;
+      decode(oid_len, p);
+      decode(hobj.snap, p);
+      decode(snap_seq, p);
+      __u32 num_snaps;
+      decode(num_snaps, p);
+      
+      //::decode(ops, p);
+      __u16 num_ops;
+      decode(num_ops, p);
+      ops.resize(num_ops);
+      for (unsigned i = 0; i < num_ops; i++)
+	decode(ops[i].op, p);
+
+      ceph::decode_nohead(oid_len, hobj.oid.name, p);
+      ceph::decode_nohead(num_snaps, snaps, p);
+
+      // recalculate pgid hash value
+      pgid.pgid.set_ps(ceph_str_hash(CEPH_STR_HASH_RJENKINS,
+				     hobj.oid.name.c_str(),
+				     hobj.oid.name.length()));
+      hobj.pool = pgid.pgid.pool();
+      hobj.set_hash(pgid.pgid.ps());
+
+      retry_attempt = -1;
+      features = 0;
+      OSDOp::split_osd_op_vector_in_data(ops, data);
+
+      // we did the full decode
+      final_decode_needed = false;
+
+      // put client_inc in reqid.inc for get_reqid()'s benefit
+      reqid = osd_reqid_t();
+      reqid.inc = client_inc;
+    } else if (header.version < 7) {
+      decode(client_inc, p);
+      decode(osdmap_epoch, p);
+      decode(flags, p);
+      decode(mtime, p);
+      eversion_t reassert_version;
+      decode(reassert_version, p);
+
+      object_locator_t oloc;
+      decode(oloc, p);
+
+      if (header.version < 3) {
+	old_pg_t opgid;
+	ceph::decode_raw(opgid, p);
+	pgid.pgid = opgid;
+      } else {
+	decode(pgid.pgid, p);
+      }
+
+      decode(hobj.oid, p);
+
+      //::decode(ops, p);
+      __u16 num_ops;
+      decode(num_ops, p);
+      ops.resize(num_ops);
+      for (unsigned i = 0; i < num_ops; i++)
+        decode(ops[i].op, p);
+
+      decode(hobj.snap, p);
+      decode(snap_seq, p);
+      decode(snaps, p);
+
+      if (header.version >= 4)
+        decode(retry_attempt, p);
+      else
+        retry_attempt = -1;
+
+      if (header.version >= 5)
+        decode(features, p);
+      else
+	features = 0;
+
+      if (header.version >= 6)
+	decode(reqid, p);
+      else
+	reqid = osd_reqid_t();
+
+      hobj.pool = pgid.pgid.pool();
+      hobj.set_key(oloc.key);
+      hobj.nspace = oloc.nspace;
+      hobj.set_hash(pgid.pgid.ps());
+
+      OSDOp::split_osd_op_vector_in_data(ops, data);
+
+      // we did the full decode
+      final_decode_needed = false;
+
+      // put client_inc in reqid.inc for get_reqid()'s benefit
+      if (reqid.name == entity_name_t() && reqid.tid == 0)
+	reqid.inc = client_inc;
+    }
+
+    partial_decode_needed = false;
+  }
+
+  bool finish_decode() {
+    using ceph::decode;
+    ceph_assert(!partial_decode_needed); // partial decoding required
+    if (!final_decode_needed)
+      return false; // Message is already final decoded
+    ceph_assert(header.version >= 7);
+
+    decode(client_inc, p);
+    decode(mtime, p);
+    object_locator_t oloc;
+    decode(oloc, p);
+    decode(hobj.oid, p);
+
+    __u16 num_ops;
+    decode(num_ops, p);
+    ops.resize(num_ops);
+    for (unsigned i = 0; i < num_ops; i++)
+      decode(ops[i].op, p);
+
+    decode(hobj.snap, p);
+    decode(snap_seq, p);
+    decode(snaps, p);
+
+    decode(retry_attempt, p);
+
+    decode(features, p);
+
+    hobj.pool = pgid.pgid.pool();
+    hobj.set_key(oloc.key);
+    hobj.nspace = oloc.nspace;
+
+    OSDOp::split_osd_op_vector_in_data(ops, data);
+
+    final_decode_needed = false;
+    return true;
+  }
+
+  void clear_buffers() override {
+    OSDOp::clear_data(ops);
+    bdata_encode = false;
+  }
+
+  std::string_view get_type_name() const override { return "osd_op"; }
+  void print(std::ostream& out) const override {
+    out << "osd_op(";
+    if (!partial_decode_needed) {
+      out << get_reqid() << ' ';
+      out << pgid;
+      if (!final_decode_needed) {
+	out << ' ';
+	out << hobj
+	    << " " << ops
+	    << " snapc " << get_snap_seq() << "=" << snaps;
+	if (is_retry_attempt())
+	  out << " RETRY=" << get_retry_attempt();
+      } else {
+	out << " " << get_raw_pg() << " (undecoded)";
+      }
+      out << " " << ceph_osd_flag_string(get_flags());
+      out << " e" << osdmap_epoch;
+    }
+    out << ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+}
+
+using MOSDOp = _mosdop::MOSDOp<std::vector<OSDOp>>;
+
+
+#endif
diff --git a/src/messages/MOSDOpReply.h b/src/messages/MOSDOpReply.h
new file mode 100644
index 000000000..54c5157c2
--- /dev/null
+++ b/src/messages/MOSDOpReply.h
@@ -0,0 +1,353 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDOPREPLY_H
+#define CEPH_MOSDOPREPLY_H
+
+#include "msg/Message.h"
+
+#include "MOSDOp.h"
+#include "common/errno.h"
+
+/*
+ * OSD op reply
+ *
+ * oid - object id
+ * op  - OSD_OP_DELETE, etc.
+ *
+ */
+
+class MOSDOpReply final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 8;
+  static constexpr int COMPAT_VERSION = 2;
+
+  object_t oid;
+  pg_t pgid;
+  std::vector<OSDOp> ops;
+  bool bdata_encode;
+  int64_t flags = 0;
+  errorcode32_t result;
+  eversion_t bad_replay_version;
+  eversion_t replay_version;
+  version_t user_version = 0;
+  epoch_t osdmap_epoch = 0;
+  int32_t retry_attempt = -1;
+  bool do_redirect;
+  request_redirect_t redirect;
+
+public:
+  const object_t& get_oid() const { return oid; }
+  const pg_t&     get_pg() const { return pgid; }
+  int      get_flags() const { return flags; }
+
+  bool     is_ondisk() const { return get_flags() & CEPH_OSD_FLAG_ONDISK; }
+  bool     is_onnvram() const { return get_flags() & CEPH_OSD_FLAG_ONNVRAM; }
+  
+  int get_result() const { return result; }
+  const eversion_t& get_replay_version() const { return replay_version; }
+  const version_t& get_user_version() const { return user_version; }
+  
+  void set_result(int r) { result = r; }
+
+  void set_reply_versions(eversion_t v, version_t uv) {
+    replay_version = v;
+    user_version = uv;
+    /* We go through some shenanigans here for backwards compatibility
+     * with old clients, who do not look at our replay_version and
+     * user_version but instead see what we now call the
+     * bad_replay_version. On pools without caching
+     * the user_version infrastructure is a slightly-laggy copy of
+     * the regular pg version/at_version infrastructure; the difference
+     * being it is not updated on watch ops like that is -- but on updates
+     * it is set equal to at_version. This means that for non-watch write ops
+     * on classic pools, all three of replay_version, user_version, and
+     * bad_replay_version are identical. But for watch ops the replay_version
+     * has been updated, while the user_at_version has not, and the semantics
+     * we promised old clients are that the version they see is not an update.
+     * So set the bad_replay_version to be the same as the user_at_version. */
+    bad_replay_version = v;
+    if (uv) {
+      bad_replay_version.version = uv;
+    }
+  }
+
+  /* Don't fill in replay_version for non-write ops */
+  void set_enoent_reply_versions(const eversion_t& v, const version_t& uv) {
+    user_version = uv;
+    bad_replay_version = v;
+  }
+
+  void set_redirect(const request_redirect_t& redir) { redirect = redir; }
+  const request_redirect_t& get_redirect() const { return redirect; }
+  bool is_redirect_reply() const { return do_redirect; }
+
+  void add_flags(int f) { flags |= f; }
+
+  void claim_op_out_data(std::vector<OSDOp>& o) {
+    ceph_assert(ops.size() == o.size());
+    for (unsigned i = 0; i < o.size(); i++) {
+      ops[i].outdata = std::move(o[i].outdata);
+    }
+  }
+  void claim_ops(std::vector<OSDOp>& o) {
+    o.swap(ops);
+    bdata_encode = false;
+  }
+  void set_op_returns(const std::vector<pg_log_op_return_item_t>& op_returns) {
+    if (op_returns.size()) {
+      ceph_assert(ops.empty() || ops.size() == op_returns.size());
+      ops.resize(op_returns.size());
+      for (unsigned i = 0; i < op_returns.size(); ++i) {
+	ops[i].rval = op_returns[i].rval;
+	ops[i].outdata = op_returns[i].bl;
+      }
+    }
+  }
+
+  /**
+   * get retry attempt
+   *
+   * If we don't know the attempt (because the server is old), return -1.
+   */
+  int get_retry_attempt() const {
+    return retry_attempt;
+  }
+  
+  // osdmap
+  epoch_t get_map_epoch() const { return osdmap_epoch; }
+
+  /*osd_reqid_t get_reqid() { return osd_reqid_t(get_dest(),
+					       head.client_inc,
+					       head.tid); }
+  */
+
+public:
+  MOSDOpReply()
+    : Message{CEPH_MSG_OSD_OPREPLY, HEAD_VERSION, COMPAT_VERSION},
+    bdata_encode(false) {
+    do_redirect = false;
+  }
+  MOSDOpReply(const MOSDOp *req, int r, epoch_t e, int acktype,
+	      bool ignore_out_data)
+    : Message{CEPH_MSG_OSD_OPREPLY, HEAD_VERSION, COMPAT_VERSION},
+      oid(req->hobj.oid), pgid(req->pgid.pgid), ops(req->ops),
+      bdata_encode(false) {
+
+    set_tid(req->get_tid());
+    result = r;
+    flags =
+      (req->flags & ~(CEPH_OSD_FLAG_ONDISK|CEPH_OSD_FLAG_ONNVRAM|CEPH_OSD_FLAG_ACK)) | acktype;
+    osdmap_epoch = e;
+    user_version = 0;
+    retry_attempt = req->get_retry_attempt();
+    do_redirect = false;
+
+    for (unsigned i = 0; i < ops.size(); i++) {
+      // zero out input data
+      ops[i].indata.clear();
+      if (ignore_out_data) {
+	// original request didn't set the RETURNVEC flag
+	ops[i].outdata.clear();
+      }
+    }
+  }
+private:
+  ~MOSDOpReply() final {}
+
+public:
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if(false == bdata_encode) {
+      OSDOp::merge_osd_op_vector_out_data(ops, data);
+      bdata_encode = true;
+    }
+
+    if ((features & CEPH_FEATURE_PGID64) == 0) {
+      header.version = 1;
+      ceph_osd_reply_head head;
+      memset(&head, 0, sizeof(head));
+      head.layout.ol_pgid = pgid.get_old_pg().v;
+      head.flags = flags;
+      head.osdmap_epoch = osdmap_epoch;
+      head.reassert_version = bad_replay_version;
+      head.result = result;
+      head.num_ops = ops.size();
+      head.object_len = oid.name.length();
+      encode(head, payload);
+      for (unsigned i = 0; i < head.num_ops; i++) {
+	encode(ops[i].op, payload);
+      }
+      ceph::encode_nohead(oid.name, payload);
+    } else {
+      header.version = HEAD_VERSION;
+      encode(oid, payload);
+      encode(pgid, payload);
+      encode(flags, payload);
+      encode(result, payload);
+      encode(bad_replay_version, payload);
+      encode(osdmap_epoch, payload);
+
+      __u32 num_ops = ops.size();
+      encode(num_ops, payload);
+      for (unsigned i = 0; i < num_ops; i++)
+	encode(ops[i].op, payload);
+
+      encode(retry_attempt, payload);
+
+      for (unsigned i = 0; i < num_ops; i++)
+	encode(ops[i].rval, payload);
+
+      encode(replay_version, payload);
+      encode(user_version, payload);
+      if ((features & CEPH_FEATURE_NEW_OSDOPREPLY_ENCODING) == 0) {
+        header.version = 6;
+        encode(redirect, payload);
+      } else {
+        do_redirect = !redirect.empty();
+        encode(do_redirect, payload);
+        if (do_redirect) {
+          encode(redirect, payload);
+        }
+      }
+      encode_trace(payload, features);
+    }
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+
+    // Always keep here the newest version of decoding order/rule
+    if (header.version == HEAD_VERSION) {
+      decode(oid, p);
+      decode(pgid, p);
+      decode(flags, p);
+      decode(result, p);
+      decode(bad_replay_version, p);
+      decode(osdmap_epoch, p);
+
+      __u32 num_ops = ops.size();
+      decode(num_ops, p);
+      ops.resize(num_ops);
+      for (unsigned i = 0; i < num_ops; i++)
+	decode(ops[i].op, p);
+      decode(retry_attempt, p);
+
+      for (unsigned i = 0; i < num_ops; ++i)
+	decode(ops[i].rval, p);
+
+      OSDOp::split_osd_op_vector_out_data(ops, data);
+
+      decode(replay_version, p);
+      decode(user_version, p);
+      decode(do_redirect, p);
+      if (do_redirect)
+	decode(redirect, p);
+      decode_trace(p);
+    } else if (header.version < 2) {
+      ceph_osd_reply_head head;
+      decode(head, p);
+      ops.resize(head.num_ops);
+      for (unsigned i = 0; i < head.num_ops; i++) {
+	decode(ops[i].op, p);
+      }
+      ceph::decode_nohead(head.object_len, oid.name, p);
+      pgid = pg_t(head.layout.ol_pgid);
+      result = (int32_t)head.result;
+      flags = head.flags;
+      replay_version = head.reassert_version;
+      user_version = replay_version.version;
+      osdmap_epoch = head.osdmap_epoch;
+      retry_attempt = -1;
+    } else {
+      decode(oid, p);
+      decode(pgid, p);
+      decode(flags, p);
+      decode(result, p);
+      decode(bad_replay_version, p);
+      decode(osdmap_epoch, p);
+
+      __u32 num_ops = ops.size();
+      decode(num_ops, p);
+      ops.resize(num_ops);
+      for (unsigned i = 0; i < num_ops; i++)
+	decode(ops[i].op, p);
+
+      if (header.version >= 3)
+	decode(retry_attempt, p);
+      else
+	retry_attempt = -1;
+
+      if (header.version >= 4) {
+	for (unsigned i = 0; i < num_ops; ++i)
+	  decode(ops[i].rval, p);
+
+	OSDOp::split_osd_op_vector_out_data(ops, data);
+      }
+
+      if (header.version >= 5) {
+	decode(replay_version, p);
+	decode(user_version, p);
+      } else {
+	replay_version = bad_replay_version;
+	user_version = replay_version.version;
+      }
+
+      if (header.version == 6) {
+	decode(redirect, p);
+        do_redirect = !redirect.empty();
+      }
+      if (header.version >= 7) {
+        decode(do_redirect, p);
+        if (do_redirect) {
+	  decode(redirect, p);
+        }
+      }
+      if (header.version >= 8) {
+        decode_trace(p);
+      }
+    }
+  }
+
+  std::string_view get_type_name() const override { return "osd_op_reply"; }
+
+  void print(std::ostream& out) const override {
+    out << "osd_op_reply(" << get_tid()
+	<< " " << oid << " " << ops
+	<< " v" << get_replay_version()
+	<< " uv" << get_user_version();
+    if (is_ondisk())
+      out << " ondisk";
+    else if (is_onnvram())
+      out << " onnvram";
+    else
+      out << " ack";
+    out << " = " << get_result();
+    if (get_result() < 0) {
+      out << " (" << cpp_strerror(get_result()) << ")";
+    }
+    if (is_redirect_reply()) {
+      out << " redirect: { " << redirect << " }";
+    }
+    out << ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+
+#endif
diff --git a/src/messages/MOSDPGBackfill.h b/src/messages/MOSDPGBackfill.h
new file mode 100644
index 000000000..eccb4e696
--- /dev/null
+++ b/src/messages/MOSDPGBackfill.h
@@ -0,0 +1,117 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGBACKFILL_H
+#define CEPH_MOSDPGBACKFILL_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGBackfill final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 3;
+public:
+  enum {
+    OP_BACKFILL_PROGRESS = 2,
+    OP_BACKFILL_FINISH = 3,
+    OP_BACKFILL_FINISH_ACK = 4,
+  };
+  const char *get_op_name(int o) const {
+    switch (o) {
+    case OP_BACKFILL_PROGRESS: return "progress";
+    case OP_BACKFILL_FINISH: return "finish";
+    case OP_BACKFILL_FINISH_ACK: return "finish_ack";
+    default: return "???";
+    }
+  }
+
+  __u32 op = 0;
+  epoch_t map_epoch = 0, query_epoch = 0;
+  spg_t pgid;
+  hobject_t last_backfill;
+  pg_stat_t stats;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return query_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(map_epoch, p);
+    decode(query_epoch, p);
+    decode(pgid.pgid, p);
+    decode(last_backfill, p);
+
+    // For compatibility with version 1
+    decode(stats.stats, p);
+
+    decode(stats, p);
+
+    // Handle hobject_t format change
+    if (!last_backfill.is_max() &&
+	last_backfill.pool == -1)
+      last_backfill.pool = pgid.pool();
+    decode(pgid.shard, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(map_epoch, payload);
+    encode(query_epoch, payload);
+    encode(pgid.pgid, payload);
+    encode(last_backfill, payload);
+
+    // For compatibility with version 1
+    encode(stats.stats, payload);
+
+    encode(stats, payload);
+
+    encode(pgid.shard, payload);
+  }
+
+  MOSDPGBackfill()
+    : MOSDFastDispatchOp{MSG_OSD_PG_BACKFILL, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGBackfill(__u32 o, epoch_t e, epoch_t qe, spg_t p)
+    : MOSDFastDispatchOp{MSG_OSD_PG_BACKFILL, HEAD_VERSION, COMPAT_VERSION},
+      op(o),
+      map_epoch(e), query_epoch(e),
+      pgid(p) {}
+private:
+  ~MOSDPGBackfill() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_backfill"; }
+  void print(std::ostream& out) const override {
+    out << "pg_backfill(" << get_op_name(op)
+	<< " " << pgid
+	<< " e " << map_epoch << "/" << query_epoch
+	<< " lb " << last_backfill
+	<< ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGBackfillRemove.h b/src/messages/MOSDPGBackfillRemove.h
new file mode 100644
index 000000000..6029024ee
--- /dev/null
+++ b/src/messages/MOSDPGBackfillRemove.h
@@ -0,0 +1,80 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Sage Weil <sage@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MOSDPGBACKFILLREMOVE_H
+#define CEPH_MOSDPGBACKFILLREMOVE_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * instruct non-primary to remove some objects during backfill
+ */
+
+class MOSDPGBackfillRemove final : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  spg_t pgid;            ///< target spg_t
+  epoch_t map_epoch = 0;
+  std::list<std::pair<hobject_t,eversion_t>> ls;    ///< objects to remove
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDPGBackfillRemove()
+    : MOSDFastDispatchOp{MSG_OSD_PG_BACKFILL_REMOVE, HEAD_VERSION,
+			 COMPAT_VERSION}
+  {}
+
+  MOSDPGBackfillRemove(spg_t pgid, epoch_t map_epoch)
+    : MOSDFastDispatchOp{MSG_OSD_PG_BACKFILL_REMOVE, HEAD_VERSION,
+			 COMPAT_VERSION},
+      pgid(pgid),
+      map_epoch(map_epoch) {}
+
+private:
+  ~MOSDPGBackfillRemove() final {}
+
+public:
+  std::string_view get_type_name() const override { return "backfill_remove"; }
+  void print(std::ostream& out) const override {
+    out << "backfill_remove(" << pgid << " e" << map_epoch
+	<< " " << ls << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(ls, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(ls, p);
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGCreate2.h b/src/messages/MOSDPGCreate2.h
new file mode 100644
index 000000000..d05387c7b
--- /dev/null
+++ b/src/messages/MOSDPGCreate2.h
@@ -0,0 +1,56 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+/*
+ * PGCreate2 - instruct an OSD to create some pgs
+ */
+
+class MOSDPGCreate2 final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  epoch_t epoch = 0;
+  std::map<spg_t,std::pair<epoch_t,utime_t>> pgs;
+  std::map<spg_t,std::pair<pg_history_t,PastIntervals>> pg_extra;
+
+  MOSDPGCreate2()
+    : Message{MSG_OSD_PG_CREATE2, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGCreate2(epoch_t e)
+    : Message{MSG_OSD_PG_CREATE2, HEAD_VERSION, COMPAT_VERSION},
+      epoch(e) { }
+private:
+  ~MOSDPGCreate2() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "pg_create2";
+  }
+  void print(std::ostream& out) const override {
+    out << "pg_create2(e" << epoch << " " << pgs << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pgs, payload);
+    encode(pg_extra, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(epoch, p);
+    decode(pgs, p);
+    if (header.version >= 2) {
+      decode(pg_extra, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGCreated.h b/src/messages/MOSDPGCreated.h
new file mode 100644
index 000000000..9be8e2ddc
--- /dev/null
+++ b/src/messages/MOSDPGCreated.h
@@ -0,0 +1,37 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "osd/osd_types.h"
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDPGCreated : public PaxosServiceMessage {
+public:
+  pg_t pgid;
+  MOSDPGCreated()
+    : PaxosServiceMessage{MSG_OSD_PG_CREATED, 0}
+  {}
+  MOSDPGCreated(pg_t pgid)
+    : PaxosServiceMessage{MSG_OSD_PG_CREATED, 0},
+      pgid(pgid)
+  {}
+  std::string_view get_type_name() const override { return "pg_created"; }
+  void print(std::ostream& out) const override {
+    out << "osd_pg_created(" << pgid << ")";
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(pgid, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(pgid, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGInfo.h b/src/messages/MOSDPGInfo.h
new file mode 100644
index 000000000..63ddc3e3e
--- /dev/null
+++ b/src/messages/MOSDPGInfo.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDPGINFO_H
+#define CEPH_MOSDPGINFO_H
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class MOSDPGInfo final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 6;
+  static constexpr int COMPAT_VERSION = 6;
+
+  epoch_t epoch = 0;
+
+public:
+  using pg_list_t = std::vector<pg_notify_t>;
+  pg_list_t pg_list;
+
+  epoch_t get_epoch() const { return epoch; }
+
+  MOSDPGInfo()
+    : MOSDPGInfo{0, {}}
+  {}
+  MOSDPGInfo(epoch_t mv)
+    : MOSDPGInfo(mv, {})
+  {}
+  MOSDPGInfo(epoch_t mv, pg_list_t&& l)
+    : Message{MSG_OSD_PG_INFO, HEAD_VERSION, COMPAT_VERSION},
+      epoch{mv},
+      pg_list{std::move(l)}
+  {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGInfo() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_info"; }
+  void print(std::ostream& out) const override {
+    out << "pg_info(";
+    for (auto i = pg_list.begin();
+         i != pg_list.end();
+         ++i) {
+      if (i != pg_list.begin())
+	out << " ";
+      out << *i;
+    }
+    out << " epoch " << epoch
+	<< ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    encode(epoch, payload);
+    assert(HAVE_FEATURE(features, SERVER_OCTOPUS));
+    encode(pg_list, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGInfo2.h b/src/messages/MOSDPGInfo2.h
new file mode 100644
index 000000000..8e7f4bc58
--- /dev/null
+++ b/src/messages/MOSDPGInfo2.h
@@ -0,0 +1,98 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGInfo2 final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t spgid;
+  epoch_t epoch_sent;
+  epoch_t min_epoch;
+  pg_info_t info;
+  std::optional<pg_lease_t> lease;
+  std::optional<pg_lease_ack_t> lease_ack;
+
+  spg_t get_spg() const override {
+    return spgid;
+  }
+  epoch_t get_map_epoch() const override {
+    return epoch_sent;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch_sent,
+      min_epoch,
+      MInfoRec(
+	pg_shard_t(get_source().num(), info.pgid.shard),
+	info,
+	epoch_sent,
+	lease,
+	lease_ack));
+  }
+
+  MOSDPGInfo2() : MOSDPeeringOp{MSG_OSD_PG_INFO2,
+				  HEAD_VERSION, COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGInfo2(
+    spg_t s,
+    pg_info_t q,
+    epoch_t sent,
+    epoch_t min,
+    std::optional<pg_lease_t> l,
+    std::optional<pg_lease_ack_t> la)
+    : MOSDPeeringOp{MSG_OSD_PG_INFO2, HEAD_VERSION, COMPAT_VERSION},
+      spgid(s),
+      epoch_sent(sent),
+      min_epoch(min),
+      info(q),
+      lease(l),
+      lease_ack(la) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+
+private:
+  ~MOSDPGInfo2() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "pg_info2";
+  }
+  void inner_print(std::ostream& out) const override {
+    out << spgid << " " << info;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(spgid, payload);
+    encode(epoch_sent, payload);
+    encode(min_epoch, payload);
+    encode(info, payload);
+    encode(lease, payload);
+    encode(lease_ack, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(spgid, p);
+    decode(epoch_sent, p);
+    decode(min_epoch, p);
+    decode(info, p);
+    decode(lease, p);
+    decode(lease_ack, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGLease.h b/src/messages/MOSDPGLease.h
new file mode 100644
index 000000000..20b197e1d
--- /dev/null
+++ b/src/messages/MOSDPGLease.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class MOSDPGLease final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  epoch_t epoch = 0;
+  spg_t spgid;
+  pg_lease_t lease;
+
+public:
+  spg_t get_spg() const {
+    return spgid;
+  }
+  epoch_t get_map_epoch() const {
+    return epoch;
+  }
+  epoch_t get_min_epoch() const {
+    return epoch;
+  }
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch,
+      epoch,
+      MLease(epoch, get_source().num(), lease));
+  }
+
+  MOSDPGLease() : MOSDPeeringOp{MSG_OSD_PG_LEASE,
+				HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGLease(version_t mv, spg_t p, pg_lease_t lease) :
+    MOSDPeeringOp{MSG_OSD_PG_LEASE,
+		  HEAD_VERSION, COMPAT_VERSION},
+    epoch(mv),
+    spgid(p),
+    lease(lease) { }
+private:
+  ~MOSDPGLease() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_lease"; }
+  void inner_print(std::ostream& out) const override {
+    out << lease;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(spgid, payload);
+    encode(lease, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(spgid, p);
+    decode(lease, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGLeaseAck.h b/src/messages/MOSDPGLeaseAck.h
new file mode 100644
index 000000000..5c6c1188a
--- /dev/null
+++ b/src/messages/MOSDPGLeaseAck.h
@@ -0,0 +1,68 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class MOSDPGLeaseAck final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  epoch_t epoch = 0;
+  spg_t spgid;
+  pg_lease_ack_t lease_ack;
+
+public:
+  spg_t get_spg() const {
+    return spgid;
+  }
+  epoch_t get_map_epoch() const {
+    return epoch;
+  }
+  epoch_t get_min_epoch() const {
+    return epoch;
+  }
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch,
+      epoch,
+      MLeaseAck(epoch, get_source().num(), lease_ack));
+  }
+
+  MOSDPGLeaseAck() : MOSDPeeringOp{MSG_OSD_PG_LEASE_ACK,
+				   HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGLeaseAck(version_t mv, spg_t p, pg_lease_ack_t lease_ack) :
+    MOSDPeeringOp{MSG_OSD_PG_LEASE_ACK,
+		  HEAD_VERSION, COMPAT_VERSION},
+    epoch(mv),
+    spgid(p),
+    lease_ack(lease_ack) { }
+private:
+  ~MOSDPGLeaseAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_lease_ack"; }
+  void inner_print(std::ostream& out) const override {
+    out << lease_ack;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(spgid, payload);
+    encode(lease_ack, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(spgid, p);
+    decode(lease_ack, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGLog.h b/src/messages/MOSDPGLog.h
new file mode 100644
index 000000000..747e3b767
--- /dev/null
+++ b/src/messages/MOSDPGLog.h
@@ -0,0 +1,130 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDPGLOG_H
+#define CEPH_MOSDPGLOG_H
+
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGLog final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 6;
+  static constexpr int COMPAT_VERSION = 6;
+
+  epoch_t epoch = 0;
+  /// query_epoch is the epoch of the query being responded to, or
+  /// the current epoch if this is not being sent in response to a
+  /// query. This allows the recipient to disregard responses to old
+  /// queries.
+  epoch_t query_epoch = 0;
+
+public:
+  shard_id_t to;
+  shard_id_t from;
+  pg_info_t info;
+  pg_log_t log;
+  pg_missing_t missing;
+  PastIntervals past_intervals;
+  std::optional<pg_lease_t> lease;
+
+  epoch_t get_epoch() const { return epoch; }
+  spg_t get_pgid() const { return spg_t(info.pgid.pgid, to); }
+  epoch_t get_query_epoch() const { return query_epoch; }
+
+  spg_t get_spg() const override {
+    return spg_t(info.pgid.pgid, to);
+  }
+  epoch_t get_map_epoch() const override {
+    return epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return query_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch, query_epoch,
+      MLogRec(pg_shard_t(get_source().num(), from),
+	      this),
+      true,
+      new PGCreateInfo(
+	get_spg(),
+	query_epoch,
+	info.history,
+	past_intervals,
+	false));
+  }
+
+  MOSDPGLog() : MOSDPeeringOp{MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH); 
+  }
+  MOSDPGLog(shard_id_t to, shard_id_t from,
+	    version_t mv, const pg_info_t& i, epoch_t query_epoch)
+    : MOSDPeeringOp{MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION},
+      epoch(mv), query_epoch(query_epoch),
+      to(to), from(from),
+      info(i)  {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+
+private:
+  ~MOSDPGLog() final {}
+
+public:
+  std::string_view get_type_name() const override { return "PGlog"; }
+  void inner_print(std::ostream& out) const override {
+    // NOTE: log is not const, but operator<< doesn't touch fields
+    // swapped out by OSD code.
+    out << "log " << log
+	<< " pi " << past_intervals;
+    if (lease) {
+      out << " " << *lease;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(info, payload);
+    encode(log, payload);
+    encode(missing, payload, features);
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    encode(query_epoch, payload);
+    encode(past_intervals, payload);
+    encode(to, payload);
+    encode(from, payload);
+    encode(lease, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(info, p);
+    log.decode(p, info.pgid.pool());
+    missing.decode(p, info.pgid.pool());
+    decode(query_epoch, p);
+    decode(past_intervals, p);
+    decode(to, p);
+    decode(from, p);
+    assert(header.version >= 6);
+    decode(lease, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGNotify.h b/src/messages/MOSDPGNotify.h
new file mode 100644
index 000000000..c7aef014a
--- /dev/null
+++ b/src/messages/MOSDPGNotify.h
@@ -0,0 +1,91 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGPEERNOTIFY_H
+#define CEPH_MOSDPGPEERNOTIFY_H
+
+#include "msg/Message.h"
+
+#include "osd/osd_types.h"
+
+/*
+ * PGNotify - notify primary of my PGs and versions.
+ */
+
+class MOSDPGNotify final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 7;
+  static constexpr int COMPAT_VERSION = 7;
+
+  epoch_t epoch = 0;
+  /// query_epoch is the epoch of the query being responded to, or
+  /// the current epoch if this is not being sent in response to a
+  /// query. This allows the recipient to disregard responses to old
+  /// queries.
+  using pg_list_t = std::vector<pg_notify_t>;
+  pg_list_t pg_list;
+
+ public:
+  version_t get_epoch() const { return epoch; }
+  const pg_list_t& get_pg_list() const {
+    return pg_list;
+  }
+
+  MOSDPGNotify()
+    : MOSDPGNotify(0, {})
+  {}
+  MOSDPGNotify(epoch_t e, pg_list_t&& l)
+    : Message{MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION},
+      epoch(e),
+      pg_list(std::move(l)) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGNotify() final {}
+
+public:  
+  std::string_view get_type_name() const override { return "PGnot"; }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    encode(epoch, payload);
+    assert(HAVE_FEATURE(features, SERVER_OCTOPUS));
+    encode(pg_list, payload);
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+  void print(std::ostream& out) const override {
+    out << "pg_notify(";
+    for (auto i = pg_list.begin();
+         i != pg_list.end();
+         ++i) {
+      if (i != pg_list.begin())
+	out << " ";
+      out << *i;
+    }
+    out << " epoch " << epoch
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGNotify2.h b/src/messages/MOSDPGNotify2.h
new file mode 100644
index 000000000..ae17edae5
--- /dev/null
+++ b/src/messages/MOSDPGNotify2.h
@@ -0,0 +1,89 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGNotify2 final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t spgid;
+  pg_notify_t notify;
+
+  spg_t get_spg() const override {
+    return spgid;
+  }
+  epoch_t get_map_epoch() const override {
+    return notify.epoch_sent;
+  }
+  epoch_t get_min_epoch() const override {
+    return notify.query_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      notify.epoch_sent,
+      notify.query_epoch,
+      MNotifyRec(
+	spgid,
+	pg_shard_t(get_source().num(), notify.from),
+	notify,
+#ifdef WITH_SEASTAR
+	features
+#else
+	get_connection()->get_features()
+#endif
+      ),
+      true,
+      new PGCreateInfo(
+	spgid,
+	notify.epoch_sent,
+	notify.info.history,
+	notify.past_intervals,
+	false));
+  }
+
+  MOSDPGNotify2() : MOSDPeeringOp{MSG_OSD_PG_NOTIFY2,
+				  HEAD_VERSION, COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGNotify2(
+    spg_t s,
+    pg_notify_t n)
+    : MOSDPeeringOp{MSG_OSD_PG_NOTIFY2, HEAD_VERSION, COMPAT_VERSION},
+      spgid(s),
+      notify(n) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+
+private:
+  ~MOSDPGNotify2() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "pg_notify2";
+  }
+  void inner_print(std::ostream& out) const override {
+    out << spgid << " " << notify;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(spgid, payload);
+    encode(notify, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(spgid, p);
+    decode(notify, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGPull.h b/src/messages/MOSDPGPull.h
new file mode 100644
index 000000000..eb5c94516
--- /dev/null
+++ b/src/messages/MOSDPGPull.h
@@ -0,0 +1,106 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDPGPULL_H
+#define MOSDPGPULL_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGPull : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 2;
+
+  std::vector<PullOp> pulls;
+
+public:
+  pg_shard_t from;
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  uint64_t cost = 0;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  std::vector<PullOp> take_pulls() {
+    return std::move(pulls);
+  }
+  void set_pulls(std::vector<PullOp>&& pull_ops) {
+    pulls = std::move(pull_ops);
+  }
+
+  MOSDPGPull()
+    : MOSDFastDispatchOp{MSG_OSD_PG_PULL, HEAD_VERSION, COMPAT_VERSION}
+  {}
+
+  void compute_cost(CephContext *cct) {
+    cost = 0;
+    for (auto i = pulls.begin(); i != pulls.end(); ++i) {
+      cost += i->cost(cct);
+    }
+  }
+
+  int get_cost() const override {
+    return cost;
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(map_epoch, p);
+    decode(pulls, p);
+    decode(cost, p);
+    decode(pgid.shard, p);
+    decode(from, p);
+    if (header.version >= 3) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(map_epoch, payload);
+    encode(pulls, payload, features);
+    encode(cost, payload);
+    encode(pgid.shard, payload);
+    encode(from, payload);
+    encode(min_epoch, payload);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDPGPull"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDPGPull(" << pgid
+	<< " e" << map_epoch << "/" << min_epoch
+	<< " cost " << cost
+	<< ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGPush.h b/src/messages/MOSDPGPush.h
new file mode 100644
index 000000000..df9dbae5b
--- /dev/null
+++ b/src/messages/MOSDPGPush.h
@@ -0,0 +1,112 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDPGPUSH_H
+#define MOSDPGPUSH_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGPush : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  pg_shard_t from;
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  std::vector<PushOp> pushes;
+  bool is_repair = false;
+
+private:
+  uint64_t cost = 0;
+
+public:
+  void compute_cost(CephContext *cct) {
+    cost = 0;
+    for (auto i = pushes.begin(); i != pushes.end(); ++i) {
+      cost += i->cost(cct);
+    }
+  }
+
+  int get_cost() const override {
+    return cost;
+  }
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void set_cost(uint64_t c) {
+    cost = c;
+  }
+
+  MOSDPGPush()
+    : MOSDFastDispatchOp{MSG_OSD_PG_PUSH, HEAD_VERSION, COMPAT_VERSION}
+  {}
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(map_epoch, p);
+    decode(pushes, p);
+    decode(cost, p);
+    decode(pgid.shard, p);
+    decode(from, p);
+    if (header.version >= 3) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    if (header.version >= 4) {
+      decode(is_repair, p);
+    } else {
+      is_repair = false;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(map_epoch, payload);
+    encode(pushes, payload, features);
+    encode(cost, payload);
+    encode(pgid.shard, payload);
+    encode(from, payload);
+    encode(min_epoch, payload);
+    encode(is_repair, payload);
+  }
+
+  std::string_view get_type_name() const override { return "MOSDPGPush"; }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDPGPush(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << pushes;
+    out << ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGPushReply.h b/src/messages/MOSDPGPushReply.h
new file mode 100644
index 000000000..1fdfd9b69
--- /dev/null
+++ b/src/messages/MOSDPGPushReply.h
@@ -0,0 +1,94 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank Storage, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef MOSDPGPUSHREPLY_H
+#define MOSDPGPUSHREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGPushReply : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  pg_shard_t from;
+  spg_t pgid;
+  epoch_t map_epoch = 0, min_epoch = 0;
+  std::vector<PushReplyOp> replies;
+  uint64_t cost = 0;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDPGPushReply()
+    : MOSDFastDispatchOp{MSG_OSD_PG_PUSH_REPLY, HEAD_VERSION, COMPAT_VERSION}
+    {}
+
+  void compute_cost(CephContext *cct) {
+    cost = 0;
+    for (auto i = replies.begin(); i != replies.end(); ++i) {
+      cost += i->cost(cct);
+    }
+  }
+
+  int get_cost() const override {
+    return cost;
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(map_epoch, p);
+    decode(replies, p);
+    decode(cost, p);
+    decode(pgid.shard, p);
+    decode(from, p);
+    if (header.version >= 3) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(map_epoch, payload);
+    encode(replies, payload);
+    encode(cost, payload);
+    encode(pgid.shard, payload);
+    encode(from, payload);
+    encode(min_epoch, payload);
+  }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDPGPushReply(" << pgid
+	<< " " << map_epoch << "/" << min_epoch
+	<< " " << replies;
+    out << ")";
+  }
+
+  std::string_view get_type_name() const override { return "MOSDPGPushReply"; }
+};
+
+#endif
diff --git a/src/messages/MOSDPGQuery.h b/src/messages/MOSDPGQuery.h
new file mode 100644
index 000000000..b9a48b989
--- /dev/null
+++ b/src/messages/MOSDPGQuery.h
@@ -0,0 +1,82 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDPGQUERY_H
+#define CEPH_MOSDPGQUERY_H
+
+#include "common/hobject.h"
+#include "msg/Message.h"
+
+/*
+ * PGQuery - query another OSD as to the contents of their PGs
+ */
+
+class MOSDPGQuery final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 4;
+
+  version_t epoch = 0;
+
+ public:
+  version_t get_epoch() const { return epoch; }
+  using pg_list_t = std::map<spg_t, pg_query_t>;
+  pg_list_t pg_list;
+
+  MOSDPGQuery() : Message{MSG_OSD_PG_QUERY,
+			  HEAD_VERSION,
+			  COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGQuery(epoch_t e, pg_list_t&& ls) :
+    Message{MSG_OSD_PG_QUERY,
+	    HEAD_VERSION,
+	    COMPAT_VERSION},
+    epoch(e),
+    pg_list(std::move(ls)) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGQuery() final {}
+
+public:  
+  std::string_view get_type_name() const override { return "pg_query"; }
+  void print(std::ostream& out) const override {
+    out << "pg_query(";
+    for (auto p = pg_list.begin(); p != pg_list.end(); ++p) {
+      if (p != pg_list.begin())
+	out << ",";
+      out << p->first;
+    }
+    out << " epoch " << epoch << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pg_list, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGQuery2.h b/src/messages/MOSDPGQuery2.h
new file mode 100644
index 000000000..d2257ee53
--- /dev/null
+++ b/src/messages/MOSDPGQuery2.h
@@ -0,0 +1,78 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGQuery2 final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  spg_t spgid;
+  pg_query_t query;
+
+  spg_t get_spg() const override {
+    return spgid;
+  }
+  epoch_t get_map_epoch() const override {
+    return query.epoch_sent;
+  }
+  epoch_t get_min_epoch() const override {
+    return query.epoch_sent;
+  }
+
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      query.epoch_sent,
+      query.epoch_sent,
+      MQuery(
+	spgid,
+	pg_shard_t(get_source().num(), query.from),
+	query,
+	query.epoch_sent),
+      false);
+  }
+
+  MOSDPGQuery2() : MOSDPeeringOp{MSG_OSD_PG_QUERY2,
+				  HEAD_VERSION, COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGQuery2(
+    spg_t s,
+    pg_query_t q)
+    : MOSDPeeringOp{MSG_OSD_PG_QUERY2, HEAD_VERSION, COMPAT_VERSION},
+      spgid(s),
+      query(q) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+
+private:
+  ~MOSDPGQuery2() final {}
+
+public:
+  std::string_view get_type_name() const override {
+    return "pg_query2";
+  }
+  void inner_print(std::ostream& out) const override {
+    out << spgid << " " << query;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(spgid, payload);
+    encode(query, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(spgid, p);
+    decode(query, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGReadyToMerge.h b/src/messages/MOSDPGReadyToMerge.h
new file mode 100644
index 000000000..e75212638
--- /dev/null
+++ b/src/messages/MOSDPGReadyToMerge.h
@@ -0,0 +1,61 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+class MOSDPGReadyToMerge : public PaxosServiceMessage {
+public:
+  pg_t pgid;
+  eversion_t source_version, target_version;
+  epoch_t last_epoch_started = 0;
+  epoch_t last_epoch_clean = 0;
+  bool ready = true;
+
+  MOSDPGReadyToMerge()
+    : PaxosServiceMessage{MSG_OSD_PG_READY_TO_MERGE, 0}
+  {}
+  MOSDPGReadyToMerge(pg_t p, eversion_t sv, eversion_t tv,
+		     epoch_t les, epoch_t lec, bool r, epoch_t v)
+    : PaxosServiceMessage{MSG_OSD_PG_READY_TO_MERGE, v},
+      pgid(p),
+      source_version(sv),
+      target_version(tv),
+      last_epoch_started(les),
+      last_epoch_clean(lec),
+      ready(r)
+  {}
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(pgid, payload);
+    encode(source_version, payload);
+    encode(target_version, payload);
+    encode(last_epoch_started, payload);
+    encode(last_epoch_clean, payload);
+    encode(ready, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(pgid, p);
+    decode(source_version, p);
+    decode(target_version, p);
+    decode(last_epoch_started, p);
+    decode(last_epoch_clean, p);
+    decode(ready, p);
+  }
+  std::string_view get_type_name() const override { return "osd_pg_ready_to_merge"; }
+  void print(std::ostream &out) const {
+    out << get_type_name()
+        << "(" << pgid
+	<< " sv " << source_version
+	<< " tv " << target_version
+	<< " les/c " << last_epoch_started << "/" << last_epoch_clean
+	<< (ready ? " ready" : " NOT READY")
+        << " v" << version << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDPGRecoveryDelete.h b/src/messages/MOSDPGRecoveryDelete.h
new file mode 100644
index 000000000..555a1c733
--- /dev/null
+++ b/src/messages/MOSDPGRecoveryDelete.h
@@ -0,0 +1,94 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_MOSDPGRECOVERYDELETE_H
+#define CEPH_MOSDPGRECOVERYDELETE_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * instruct non-primary to remove some objects during recovery
+ */
+
+class MOSDPGRecoveryDelete final : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  pg_shard_t from;
+  spg_t pgid;            ///< target spg_t
+  epoch_t map_epoch, min_epoch;
+  std::list<std::pair<hobject_t, eversion_t>> objects;    ///< objects to remove
+
+private:
+  uint64_t cost = 0;
+
+public:
+  int get_cost() const override {
+    return cost;
+  }
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void set_cost(uint64_t c) {
+    cost = c;
+  }
+
+  MOSDPGRecoveryDelete()
+    : MOSDFastDispatchOp{MSG_OSD_PG_RECOVERY_DELETE, HEAD_VERSION,
+			 COMPAT_VERSION}
+  {}
+
+  MOSDPGRecoveryDelete(pg_shard_t from, spg_t pgid, epoch_t map_epoch,
+		       epoch_t min_epoch)
+    : MOSDFastDispatchOp{MSG_OSD_PG_RECOVERY_DELETE, HEAD_VERSION,
+			 COMPAT_VERSION},
+      from(from),
+      pgid(pgid),
+      map_epoch(map_epoch),
+      min_epoch(min_epoch)
+  {}
+
+private:
+  ~MOSDPGRecoveryDelete() final {}
+
+public:
+  std::string_view get_type_name() const { return "recovery_delete"; }
+  void print(std::ostream& out) const {
+    out << "MOSDPGRecoveryDelete(" << pgid << " e" << map_epoch << ","
+	<< min_epoch << " " << objects << ")";
+  }
+
+  void encode_payload(uint64_t features) {
+    using ceph::encode;
+    encode(from, payload);
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(min_epoch, payload);
+    encode(cost, payload);
+    encode(objects, payload);
+  }
+  void decode_payload() {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(from, p);
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(min_epoch, p);
+    decode(cost, p);
+    decode(objects, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGRecoveryDeleteReply.h b/src/messages/MOSDPGRecoveryDeleteReply.h
new file mode 100644
index 000000000..60f494b62
--- /dev/null
+++ b/src/messages/MOSDPGRecoveryDeleteReply.h
@@ -0,0 +1,67 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef MOSDRECOVERYDELETEREPLY_H
+#define MOSDRECOVERYDELETEREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGRecoveryDeleteReply : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  pg_shard_t from;
+  spg_t pgid;
+  epoch_t map_epoch = 0;
+  epoch_t min_epoch = 0;
+  std::list<std::pair<hobject_t, eversion_t> > objects;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDPGRecoveryDeleteReply()
+    : MOSDFastDispatchOp{MSG_OSD_PG_RECOVERY_DELETE_REPLY, HEAD_VERSION, COMPAT_VERSION}
+  {}
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(map_epoch, p);
+    decode(min_epoch, p);
+    decode(objects, p);
+    decode(pgid.shard, p);
+    decode(from, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(map_epoch, payload);
+    encode(min_epoch, payload);
+    encode(objects, payload);
+    encode(pgid.shard, payload);
+    encode(from, payload);
+  }
+
+  void print(std::ostream& out) const override {
+    out << "MOSDPGRecoveryDeleteReply(" << pgid
+        << " e" << map_epoch << "," << min_epoch << " " << objects << ")";
+  }
+
+  std::string_view get_type_name() const override { return "recovery_delete_reply"; }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGRemove.h b/src/messages/MOSDPGRemove.h
new file mode 100644
index 000000000..3ac651ba7
--- /dev/null
+++ b/src/messages/MOSDPGRemove.h
@@ -0,0 +1,71 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDPGREMOVE_H
+#define CEPH_MOSDPGREMOVE_H
+
+#include "common/hobject.h"
+#include "msg/Message.h"
+
+
+class MOSDPGRemove final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 3;
+
+  epoch_t epoch = 0;
+
+ public:
+  std::vector<spg_t> pg_list;
+
+  epoch_t get_epoch() const { return epoch; }
+
+  MOSDPGRemove() :
+    Message{MSG_OSD_PG_REMOVE, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGRemove(epoch_t e, std::vector<spg_t>& l) :
+    Message{MSG_OSD_PG_REMOVE, HEAD_VERSION, COMPAT_VERSION} {
+    this->epoch = e;
+    pg_list.swap(l);
+  }
+private:
+  ~MOSDPGRemove() final {}
+
+public:
+  std::string_view get_type_name() const override { return "PGrm"; }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pg_list, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+  void print(std::ostream& out) const override {
+    out << "osd pg remove(" << "epoch " << epoch << "; ";
+    for (auto i = pg_list.begin(); i != pg_list.end(); ++i) {
+      out << "pg" << *i << "; ";
+    }
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGScan.h b/src/messages/MOSDPGScan.h
new file mode 100644
index 000000000..be555e7c2
--- /dev/null
+++ b/src/messages/MOSDPGScan.h
@@ -0,0 +1,115 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGSCAN_H
+#define CEPH_MOSDPGSCAN_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGScan final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  enum {
+    OP_SCAN_GET_DIGEST = 1,      // just objects and versions
+    OP_SCAN_DIGEST = 2,          // result
+  };
+  const char *get_op_name(int o) const {
+    switch (o) {
+    case OP_SCAN_GET_DIGEST: return "get_digest";
+    case OP_SCAN_DIGEST: return "digest";
+    default: return "???";
+    }
+  }
+
+  __u32 op = 0;
+  epoch_t map_epoch = 0, query_epoch = 0;
+  pg_shard_t from;
+  spg_t pgid;
+  hobject_t begin, end;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return query_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(map_epoch, p);
+    decode(query_epoch, p);
+    decode(pgid.pgid, p);
+    decode(begin, p);
+    decode(end, p);
+
+    // handle hobject_t format upgrade
+    if (!begin.is_max() && begin.pool == -1)
+      begin.pool = pgid.pool();
+    if (!end.is_max() && end.pool == -1)
+      end.pool = pgid.pool();
+
+    decode(from, p);
+    decode(pgid.shard, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(map_epoch, payload);
+    assert(HAVE_FEATURE(features, SERVER_NAUTILUS));
+    encode(query_epoch, payload);
+    encode(pgid.pgid, payload);
+    encode(begin, payload);
+    encode(end, payload);
+    encode(from, payload);
+    encode(pgid.shard, payload);
+  }
+
+  MOSDPGScan()
+    : MOSDFastDispatchOp{MSG_OSD_PG_SCAN, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGScan(__u32 o, pg_shard_t from,
+	     epoch_t e, epoch_t qe, spg_t p, hobject_t be, hobject_t en)
+    : MOSDFastDispatchOp{MSG_OSD_PG_SCAN, HEAD_VERSION, COMPAT_VERSION},
+      op(o),
+      map_epoch(e), query_epoch(qe),
+      from(from),
+      pgid(p),
+      begin(be), end(en) {
+  }
+private:
+  ~MOSDPGScan() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_scan"; }
+  void print(std::ostream& out) const override {
+    out << "pg_scan(" << get_op_name(op)
+	<< " " << pgid
+	<< " " << begin << "-" << end
+	<< " e " << map_epoch << "/" << query_epoch
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGTemp.h b/src/messages/MOSDPGTemp.h
new file mode 100644
index 000000000..d73a767b7
--- /dev/null
+++ b/src/messages/MOSDPGTemp.h
@@ -0,0 +1,69 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+
+#ifndef CEPH_MOSDPGTEMP_H
+#define CEPH_MOSDPGTEMP_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MOSDPGTemp final : public PaxosServiceMessage {
+public:
+  epoch_t map_epoch = 0;
+  std::map<pg_t, std::vector<int32_t> > pg_temp;
+  bool forced = false;
+
+  MOSDPGTemp(epoch_t e)
+    : PaxosServiceMessage{MSG_OSD_PGTEMP, e, HEAD_VERSION, COMPAT_VERSION},
+      map_epoch(e)
+  {}
+  MOSDPGTemp()
+    : MOSDPGTemp(0)
+  {}
+private:
+  ~MOSDPGTemp() final {}
+
+public:
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(map_epoch, payload);
+    encode(pg_temp, payload);
+    encode(forced, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(map_epoch, p);
+    decode(pg_temp, p);
+    if (header.version >= 2) {
+      decode(forced, p);
+    }
+  }
+
+  std::string_view get_type_name() const override { return "osd_pgtemp"; }
+  void print(std::ostream &out) const override {
+    out << "osd_pgtemp(e" << map_epoch << " " << pg_temp << " v" << version << ")";
+  }
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGTrim.h b/src/messages/MOSDPGTrim.h
new file mode 100644
index 000000000..91ba1c786
--- /dev/null
+++ b/src/messages/MOSDPGTrim.h
@@ -0,0 +1,82 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGTRIM_H
+#define CEPH_MOSDPGTRIM_H
+
+#include "msg/Message.h"
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGTrim final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  epoch_t epoch = 0;
+  spg_t pgid;
+  eversion_t trim_to;
+
+  epoch_t get_epoch() const { return epoch; }
+  spg_t get_spg() const {
+    return pgid;
+  }
+  epoch_t get_map_epoch() const {
+    return epoch;
+  }
+  epoch_t get_min_epoch() const {
+    return epoch;
+  }
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch,
+      epoch,
+      MTrim(epoch, get_source().num(), pgid.shard, trim_to));
+  }
+
+  MOSDPGTrim() : MOSDPeeringOp{MSG_OSD_PG_TRIM, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDPGTrim(version_t mv, spg_t p, eversion_t tt) :
+    MOSDPeeringOp{MSG_OSD_PG_TRIM, HEAD_VERSION, COMPAT_VERSION},
+    epoch(mv), pgid(p), trim_to(tt) { }
+private:
+  ~MOSDPGTrim() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_trim"; }
+  void inner_print(std::ostream& out) const override {
+    out << trim_to;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pgid.pgid, payload);
+    encode(trim_to, payload);
+    encode(pgid.shard, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pgid.pgid, p);
+    decode(trim_to, p);
+    decode(pgid.shard, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGUpdateLogMissing.h b/src/messages/MOSDPGUpdateLogMissing.h
new file mode 100644
index 000000000..2a0011e8f
--- /dev/null
+++ b/src/messages/MOSDPGUpdateLogMissing.h
@@ -0,0 +1,124 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDPGUPDATELOGMISSING_H
+#define CEPH_MOSDPGUPDATELOGMISSING_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGUpdateLogMissing final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  epoch_t map_epoch = 0, min_epoch = 0;
+  spg_t pgid;
+  shard_id_t from;
+  ceph_tid_t rep_tid = 0;
+  mempool::osd_pglog::list<pg_log_entry_t> entries;
+  // piggybacked osd/pg state
+  eversion_t pg_trim_to; // primary->replica: trim to here
+  eversion_t pg_roll_forward_to; // primary->replica: trim rollback info to here
+
+  epoch_t get_epoch() const { return map_epoch; }
+  spg_t get_pgid() const { return pgid; }
+  epoch_t get_query_epoch() const { return map_epoch; }
+  ceph_tid_t get_tid() const { return rep_tid; }
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDPGUpdateLogMissing()
+    : MOSDFastDispatchOp{MSG_OSD_PG_UPDATE_LOG_MISSING, HEAD_VERSION,
+			 COMPAT_VERSION} {}
+  MOSDPGUpdateLogMissing(
+    const mempool::osd_pglog::list<pg_log_entry_t> &entries,
+    spg_t pgid,
+    shard_id_t from,
+    epoch_t epoch,
+    epoch_t min_epoch,
+    ceph_tid_t rep_tid,
+    eversion_t pg_trim_to,
+    eversion_t pg_roll_forward_to)
+    : MOSDFastDispatchOp{MSG_OSD_PG_UPDATE_LOG_MISSING, HEAD_VERSION,
+			 COMPAT_VERSION},
+      map_epoch(epoch),
+      min_epoch(min_epoch),
+      pgid(pgid),
+      from(from),
+      rep_tid(rep_tid),
+      entries(entries),
+      pg_trim_to(pg_trim_to),
+      pg_roll_forward_to(pg_roll_forward_to)
+  {}
+
+private:
+  ~MOSDPGUpdateLogMissing() final {}
+
+public:
+  std::string_view get_type_name() const override { return "PGUpdateLogMissing"; }
+  void print(std::ostream& out) const override {
+    out << "pg_update_log_missing(" << pgid << " epoch " << map_epoch
+	<< "/" << min_epoch
+	<< " rep_tid " << rep_tid
+	<< " entries " << entries
+	<< " trim_to " << pg_trim_to
+	<< " roll_forward_to " << pg_roll_forward_to
+	<< ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(map_epoch, payload);
+    encode(pgid, payload);
+    encode(from, payload);
+    encode(rep_tid, payload);
+    encode(entries, payload);
+    encode(min_epoch, payload);
+    encode(pg_trim_to, payload);
+    encode(pg_roll_forward_to, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(map_epoch, p);
+    decode(pgid, p);
+    decode(from, p);
+    decode(rep_tid, p);
+    decode(entries, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    if (header.version >= 3) {
+      decode(pg_trim_to, p);
+      decode(pg_roll_forward_to, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPGUpdateLogMissingReply.h b/src/messages/MOSDPGUpdateLogMissingReply.h
new file mode 100644
index 000000000..559c14353
--- /dev/null
+++ b/src/messages/MOSDPGUpdateLogMissingReply.h
@@ -0,0 +1,115 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDPGUPDATELOGMISSINGREPLY_H
+#define CEPH_MOSDPGUPDATELOGMISSINGREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDPGUpdateLogMissingReply final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+
+public:
+  epoch_t map_epoch = 0, min_epoch = 0;
+  spg_t pgid;
+  shard_id_t from;
+  ceph_tid_t rep_tid = 0;
+  // piggybacked osd state
+  eversion_t last_complete_ondisk;
+
+  epoch_t get_epoch() const { return map_epoch; }
+  spg_t get_pgid() const { return pgid; }
+  epoch_t get_query_epoch() const { return map_epoch; }
+  ceph_tid_t get_tid() const { return rep_tid; }
+  pg_shard_t get_from() const {
+    return pg_shard_t(get_source().num(), from);
+  }
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDPGUpdateLogMissingReply()
+    : MOSDFastDispatchOp{MSG_OSD_PG_UPDATE_LOG_MISSING_REPLY, HEAD_VERSION,
+			 COMPAT_VERSION}
+  {}
+  MOSDPGUpdateLogMissingReply(
+    spg_t pgid,
+    shard_id_t from,
+    epoch_t epoch,
+    epoch_t min_epoch,
+    ceph_tid_t rep_tid,
+    eversion_t last_complete_ondisk)
+    : MOSDFastDispatchOp{MSG_OSD_PG_UPDATE_LOG_MISSING_REPLY, HEAD_VERSION,
+			 COMPAT_VERSION},
+      map_epoch(epoch),
+      min_epoch(min_epoch),
+      pgid(pgid),
+      from(from),
+      rep_tid(rep_tid),
+      last_complete_ondisk(last_complete_ondisk)
+    {}
+
+private:
+  ~MOSDPGUpdateLogMissingReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "PGUpdateLogMissingReply"; }
+  void print(std::ostream& out) const override {
+    out << "pg_update_log_missing_reply(" << pgid << " epoch " << map_epoch
+	<< "/" << min_epoch
+	<< " rep_tid " << rep_tid
+	<< " lcod " << last_complete_ondisk << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(map_epoch, payload);
+    encode(pgid, payload);
+    encode(from, payload);
+    encode(rep_tid, payload);
+    encode(min_epoch, payload);
+    encode(last_complete_ondisk, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(map_epoch, p);
+    decode(pgid, p);
+    decode(from, p);
+    decode(rep_tid, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    if (header.version >= 3) {
+      decode(last_complete_ondisk, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDPeeringOp.h b/src/messages/MOSDPeeringOp.h
new file mode 100644
index 000000000..bfb038026
--- /dev/null
+++ b/src/messages/MOSDPeeringOp.h
@@ -0,0 +1,40 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class PGPeeringEvent;
+
+class MOSDPeeringOp : public Message {
+public:
+  MOSDPeeringOp(int t, int version, int compat_version)
+    : Message{t, version, compat_version} {}
+
+  void print(std::ostream& out) const override final {
+    out << get_type_name() << "("
+	<< get_spg() << " ";
+    inner_print(out);
+    out << " e" << get_map_epoch() << "/" << get_min_epoch() << ")";
+  }
+
+  virtual spg_t get_spg() const = 0;
+  virtual epoch_t get_map_epoch() const = 0;
+  virtual epoch_t get_min_epoch() const = 0;
+  virtual PGPeeringEvent *get_event() = 0;
+  virtual void inner_print(std::ostream& out) const = 0;
+
+#ifdef WITH_SEASTAR
+  // In crimson, conn is independently maintained outside Message.
+  // Instead of get features from the connection later, set features at
+  // the start of the operation.
+  void set_features(uint64_t _features) {
+    features = _features;
+  }
+
+protected:
+  uint64_t features;
+#endif
+};
diff --git a/src/messages/MOSDPing.h b/src/messages/MOSDPing.h
new file mode 100644
index 000000000..8f512a7d7
--- /dev/null
+++ b/src/messages/MOSDPing.h
@@ -0,0 +1,168 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+/**
+ * This is used to send pings between daemons (so far, the OSDs) for
+ * heartbeat purposes. We include a timestamp and distinguish between
+ * outgoing pings and responses to those. If you set the
+ * min_message in the constructor, the message will inflate itself
+ * to the specified size -- this is good for dealing with network
+ * issues with jumbo frames. See http://tracker.ceph.com/issues/20087
+ *
+ */
+
+#ifndef CEPH_MOSDPING_H
+#define CEPH_MOSDPING_H
+
+#include "common/Clock.h"
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+
+class MOSDPing final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 5;
+  static constexpr int COMPAT_VERSION = 4;
+
+ public:
+  enum {
+    HEARTBEAT = 0,
+    START_HEARTBEAT = 1,
+    YOU_DIED = 2,
+    STOP_HEARTBEAT = 3,
+    PING = 4,
+    PING_REPLY = 5,
+  };
+  const char *get_op_name(int op) const {
+    switch (op) {
+    case HEARTBEAT: return "heartbeat";
+    case START_HEARTBEAT: return "start_heartbeat";
+    case STOP_HEARTBEAT: return "stop_heartbeat";
+    case YOU_DIED: return "you_died";
+    case PING: return "ping";
+    case PING_REPLY: return "ping_reply";
+    default: return "???";
+    }
+  }
+
+  uuid_d fsid;
+  epoch_t map_epoch = 0;
+  __u8 op = 0;
+  utime_t ping_stamp;               ///< when the PING was sent
+  ceph::signedspan mono_ping_stamp; ///< relative to sender's clock
+  ceph::signedspan mono_send_stamp; ///< replier's send stamp
+  std::optional<ceph::signedspan> delta_ub;  ///< ping sender
+  epoch_t up_from = 0;
+
+  uint32_t min_message_size = 0;
+
+  MOSDPing(const uuid_d& f, epoch_t e, __u8 o,
+	   utime_t s,
+	   ceph::signedspan ms,
+	   ceph::signedspan mss,
+	   epoch_t upf,
+	   uint32_t min_message,
+	   std::optional<ceph::signedspan> delta_ub = {})
+    : Message{MSG_OSD_PING, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), map_epoch(e), op(o),
+      ping_stamp(s),
+      mono_ping_stamp(ms),
+      mono_send_stamp(mss),
+      delta_ub(delta_ub),
+      up_from(upf),
+      min_message_size(min_message)
+  { }
+  MOSDPing()
+    : Message{MSG_OSD_PING, HEAD_VERSION, COMPAT_VERSION}
+  {}
+private:
+  ~MOSDPing() final {}
+
+public:
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(map_epoch, p);
+    decode(op, p);
+    decode(ping_stamp, p);
+
+    int payload_mid_length = p.get_off();
+    uint32_t size;
+    decode(size, p);
+
+    if (header.version >= 5) {
+      decode(up_from, p);
+      decode(mono_ping_stamp, p);
+      decode(mono_send_stamp, p);
+      decode(delta_ub, p);
+    }
+
+    p += size;
+    min_message_size = size + payload_mid_length;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(map_epoch, payload);
+    encode(op, payload);
+    encode(ping_stamp, payload);
+
+    size_t s = 0;
+    if (min_message_size > payload.length()) {
+      s = min_message_size - payload.length();
+    }
+    encode((uint32_t)s, payload);
+
+    encode(up_from, payload);
+    encode(mono_ping_stamp, payload);
+    encode(mono_send_stamp, payload);
+    encode(delta_ub, payload);
+
+    if (s) {
+      // this should be big enough for normal min_message padding sizes. since
+      // we are targeting jumbo ethernet frames around 9000 bytes, 16k should
+      // be more than sufficient!  the compiler will statically zero this so
+      // that at runtime we are only adding a bufferptr reference to it.
+      static char zeros[16384] = {};
+      while (s > sizeof(zeros)) {
+        payload.append(ceph::buffer::create_static(sizeof(zeros), zeros));
+        s -= sizeof(zeros);
+      }
+      if (s) {
+        payload.append(ceph::buffer::create_static(s, zeros));
+      }
+    }
+  }
+
+  std::string_view get_type_name() const override { return "osd_ping"; }
+  void print(std::ostream& out) const override {
+    out << "osd_ping(" << get_op_name(op)
+	<< " e" << map_epoch
+	<< " up_from " << up_from
+	<< " ping_stamp " << ping_stamp << "/" << mono_ping_stamp
+	<< " send_stamp " << mono_send_stamp;
+    if (delta_ub) {
+      out << " delta_ub " << *delta_ub;
+    }
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDRepOp.h b/src/messages/MOSDRepOp.h
new file mode 100644
index 000000000..ecfe3294d
--- /dev/null
+++ b/src/messages/MOSDRepOp.h
@@ -0,0 +1,196 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDREPOP_H
+#define CEPH_MOSDREPOP_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * OSD sub op - for internal ops on pobjects between primary and replicas(/stripes/whatever)
+ */
+
+class MOSDRepOp final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  epoch_t map_epoch, min_epoch;
+
+  // metadata from original request
+  osd_reqid_t reqid;
+
+  spg_t pgid;
+
+  ceph::buffer::list::const_iterator p;
+  // Decoding flags. Decoding is only needed for messages caught by pipe reader.
+  bool final_decode_needed;
+
+  // subop
+  pg_shard_t from;
+  hobject_t poid;
+
+  __u8 acks_wanted;
+
+  // transaction to exec
+  ceph::buffer::list logbl;
+  pg_stat_t pg_stats;
+
+  // subop metadata
+  eversion_t version;
+
+  // piggybacked osd/og state
+  eversion_t pg_trim_to;   // primary->replica: trim to here
+  eversion_t min_last_complete_ondisk; // lower bound on committed version
+
+  hobject_t new_temp_oid;      ///< new temp object that we must now start tracking
+  hobject_t discard_temp_oid;  ///< previously used temp object that we can now stop tracking
+
+  /// non-empty if this transaction involves a hit_set history update
+  std::optional<pg_hit_set_history_t> updated_hit_set_history;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  int get_cost() const override {
+    return data.length();
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    p = payload.cbegin();
+    // split to partial and final
+    decode(map_epoch, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    decode(reqid, p);
+    decode(pgid, p);
+  }
+
+  void finish_decode() {
+    using ceph::decode;
+    if (!final_decode_needed)
+      return; // Message is already final decoded
+    decode(poid, p);
+
+    decode(acks_wanted, p);
+    decode(version, p);
+    decode(logbl, p);
+    decode(pg_stats, p);
+    decode(pg_trim_to, p);
+
+
+    decode(new_temp_oid, p);
+    decode(discard_temp_oid, p);
+
+    decode(from, p);
+    decode(updated_hit_set_history, p);
+
+    if (header.version >= 3) {
+      decode(min_last_complete_ondisk, p);
+    } else {
+      /* This field used to mean pg_roll_foward_to, but ReplicatedBackend
+       * simply assumes that we're rolling foward to version. */
+      eversion_t pg_roll_forward_to;
+      decode(pg_roll_forward_to, p);
+    }
+    final_decode_needed = false;
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(map_epoch, payload);
+    assert(HAVE_FEATURE(features, SERVER_OCTOPUS));
+    header.version = HEAD_VERSION;
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+    encode(reqid, payload);
+    encode(pgid, payload);
+    encode(poid, payload);
+
+    encode(acks_wanted, payload);
+    encode(version, payload);
+    encode(logbl, payload);
+    encode(pg_stats, payload);
+    encode(pg_trim_to, payload);
+    encode(new_temp_oid, payload);
+    encode(discard_temp_oid, payload);
+    encode(from, payload);
+    encode(updated_hit_set_history, payload);
+    encode(min_last_complete_ondisk, payload);
+  }
+
+  MOSDRepOp()
+    : MOSDFastDispatchOp{MSG_OSD_REPOP, HEAD_VERSION, COMPAT_VERSION},
+      map_epoch(0),
+      final_decode_needed(true), acks_wanted (0) {}
+  MOSDRepOp(osd_reqid_t r, pg_shard_t from,
+	    spg_t p, const hobject_t& po, int aw,
+	    epoch_t mape, epoch_t min_epoch, ceph_tid_t rtid, eversion_t v)
+    : MOSDFastDispatchOp{MSG_OSD_REPOP, HEAD_VERSION, COMPAT_VERSION},
+      map_epoch(mape),
+      min_epoch(min_epoch),
+      reqid(r),
+      pgid(p),
+      final_decode_needed(false),
+      from(from),
+      poid(po),
+      acks_wanted(aw),
+      version(v) {
+    set_tid(rtid);
+  }
+
+  void set_rollback_to(const eversion_t &rollback_to) {
+    header.version = 2;
+    min_last_complete_ondisk = rollback_to;
+  }
+private:
+  ~MOSDRepOp() final {}
+
+public:
+  std::string_view get_type_name() const override { return "osd_repop"; }
+  void print(std::ostream& out) const override {
+    out << "osd_repop(" << reqid
+	<< " " << pgid << " e" << map_epoch << "/" << min_epoch;
+    if (!final_decode_needed) {
+      out << " " << poid << " v " << version;
+      if (updated_hit_set_history)
+        out << ", has_updated_hit_set_history";
+      if (header.version < 3) {
+	out << ", rollback_to(legacy)=" << min_last_complete_ondisk;
+      } else {
+	out << ", mlcod=" << min_last_complete_ondisk;
+      }
+    }
+    out << ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDRepOpReply.h b/src/messages/MOSDRepOpReply.h
new file mode 100644
index 000000000..d6229581a
--- /dev/null
+++ b/src/messages/MOSDRepOpReply.h
@@ -0,0 +1,160 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MOSDREPOPREPLY_H
+#define CEPH_MOSDREPOPREPLY_H
+
+#include "MOSDFastDispatchOp.h"
+#include "MOSDRepOp.h"
+
+/*
+ * OSD Client Subop reply
+ *
+ * oid - object id
+ * op  - OSD_OP_DELETE, etc.
+ *
+ */
+
+class MOSDRepOpReply final : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  epoch_t map_epoch, min_epoch;
+
+  // subop metadata
+  osd_reqid_t reqid;
+  pg_shard_t from;
+  spg_t pgid;
+
+  // result
+  __u8 ack_type;
+  int32_t result;
+
+  // piggybacked osd state
+  eversion_t last_complete_ondisk;
+
+  ceph::buffer::list::const_iterator p;
+  // Decoding flags. Decoding is only needed for messages caught by pipe reader.
+  bool final_decode_needed;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    p = payload.cbegin();
+    decode(map_epoch, p);
+    if (header.version >= 2) {
+      decode(min_epoch, p);
+      decode_trace(p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    decode(reqid, p);
+    decode(pgid, p);
+  }
+
+  void finish_decode() {
+    using ceph::decode;
+    if (!final_decode_needed)
+      return; // Message is already final decoded
+    decode(ack_type, p);
+    decode(result, p);
+    decode(last_complete_ondisk, p);
+
+    decode(from, p);
+    final_decode_needed = false;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(map_epoch, payload);
+    header.version = HEAD_VERSION;
+    encode(min_epoch, payload);
+    encode_trace(payload, features);
+    encode(reqid, payload);
+    encode(pgid, payload);
+    encode(ack_type, payload);
+    encode(result, payload);
+    encode(last_complete_ondisk, payload);
+    encode(from, payload);
+  }
+
+  spg_t get_pg() { return pgid; }
+
+  int get_ack_type() { return ack_type; }
+  bool is_ondisk() { return ack_type & CEPH_OSD_FLAG_ONDISK; }
+  bool is_onnvram() { return ack_type & CEPH_OSD_FLAG_ONNVRAM; }
+
+  int get_result() { return result; }
+
+  void set_last_complete_ondisk(eversion_t v) { last_complete_ondisk = v; }
+  eversion_t get_last_complete_ondisk() const { return last_complete_ondisk; }
+
+public:
+  MOSDRepOpReply(
+    const MOSDRepOp *req, pg_shard_t from, int result_, epoch_t e, epoch_t mine,
+    int at) :
+    MOSDFastDispatchOp{MSG_OSD_REPOPREPLY, HEAD_VERSION, COMPAT_VERSION},
+    map_epoch(e),
+    min_epoch(mine),
+    reqid(req->reqid),
+    from(from),
+    pgid(req->pgid.pgid, req->from.shard),
+    ack_type(at),
+    result(result_),
+    final_decode_needed(false) {
+    set_tid(req->get_tid());
+  }
+  MOSDRepOpReply() 
+    : MOSDFastDispatchOp{MSG_OSD_REPOPREPLY, HEAD_VERSION, COMPAT_VERSION},
+      map_epoch(0),
+      min_epoch(0),
+      ack_type(0), result(0),
+      final_decode_needed(true) {}
+private:
+  ~MOSDRepOpReply() final {}
+
+public:
+  std::string_view get_type_name() const override { return "osd_repop_reply"; }
+
+  void print(std::ostream& out) const override {
+    out << "osd_repop_reply(" << reqid
+        << " " << pgid << " e" << map_epoch << "/" << min_epoch;
+    if (!final_decode_needed) {
+      if (ack_type & CEPH_OSD_FLAG_ONDISK)
+        out << " ondisk";
+      if (ack_type & CEPH_OSD_FLAG_ONNVRAM)
+        out << " onnvram";
+      if (ack_type & CEPH_OSD_FLAG_ACK)
+        out << " ack";
+      out << ", result = " << result;
+    }
+    out << ")";
+  }
+
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDRepScrub.h b/src/messages/MOSDRepScrub.h
new file mode 100644
index 000000000..ededcdca8
--- /dev/null
+++ b/src/messages/MOSDRepScrub.h
@@ -0,0 +1,142 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MOSDREPSCRUB_H
+#define CEPH_MOSDREPSCRUB_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * instruct an OSD initiate a replica scrub on a specific PG
+ */
+
+class MOSDRepScrub final : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 9;
+  static constexpr int COMPAT_VERSION = 6;
+
+  spg_t pgid;             // PG to scrub
+  eversion_t scrub_from; // only scrub log entries after scrub_from
+  eversion_t scrub_to;   // last_update_applied when message sent (not used)
+  epoch_t map_epoch = 0, min_epoch = 0;
+  bool chunky;           // true for chunky scrubs
+  hobject_t start;       // lower bound of scrub, inclusive
+  hobject_t end;         // upper bound of scrub, exclusive
+  bool deep;             // true if scrub should be deep
+  bool allow_preemption = false;
+  int32_t priority = 0;
+  bool high_priority = false;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return min_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDRepScrub()
+    : MOSDFastDispatchOp{MSG_OSD_REP_SCRUB, HEAD_VERSION, COMPAT_VERSION},
+      chunky(false),
+      deep(false) { }
+
+  MOSDRepScrub(spg_t pgid, eversion_t scrub_to, epoch_t map_epoch, epoch_t min_epoch,
+               hobject_t start, hobject_t end, bool deep,
+	       bool preemption, int prio, bool highprio)
+    : MOSDFastDispatchOp{MSG_OSD_REP_SCRUB, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid),
+      scrub_to(scrub_to),
+      map_epoch(map_epoch),
+      min_epoch(min_epoch),
+      chunky(true),
+      start(start),
+      end(end),
+      deep(deep),
+      allow_preemption(preemption),
+      priority(prio),
+      high_priority(highprio) { }
+
+
+private:
+  ~MOSDRepScrub() final {}
+
+public:
+  std::string_view get_type_name() const override { return "replica scrub"; }
+  void print(std::ostream& out) const override {
+    out << "replica_scrub(pg: "	<< pgid
+	<< ",from:" << scrub_from
+	<< ",to:" << scrub_to
+        << ",epoch:" << map_epoch << "/" << min_epoch
+	<< ",start:" << start << ",end:" << end
+        << ",chunky:" << chunky
+        << ",deep:" << deep
+        << ",version:" << header.version
+	<< ",allow_preemption:" << (int)allow_preemption
+	<< ",priority=" << priority
+	<< (high_priority ? " (high)":"")
+	<< ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(scrub_from, payload);
+    encode(scrub_to, payload);
+    encode(map_epoch, payload);
+    encode(chunky, payload);
+    encode(start, payload);
+    encode(end, payload);
+    encode(deep, payload);
+    encode(pgid.shard, payload);
+    encode((uint32_t)-1, payload); // seed
+    encode(min_epoch, payload);
+    encode(allow_preemption, payload);
+    encode(priority, payload);
+    encode(high_priority, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid.pgid, p);
+    decode(scrub_from, p);
+    decode(scrub_to, p);
+    decode(map_epoch, p);
+    decode(chunky, p);
+    decode(start, p);
+    decode(end, p);
+    decode(deep, p);
+    decode(pgid.shard, p);
+    {
+      uint32_t seed;
+      decode(seed, p);
+    }
+    if (header.version >= 7) {
+      decode(min_epoch, p);
+    } else {
+      min_epoch = map_epoch;
+    }
+    if (header.version >= 8) {
+      decode(allow_preemption, p);
+    }
+    if (header.version >= 9) {
+      decode(priority, p);
+      decode(high_priority, p);
+    }
+  }
+};
+
+#endif
diff --git a/src/messages/MOSDRepScrubMap.h b/src/messages/MOSDRepScrubMap.h
new file mode 100644
index 000000000..51e8b02ee
--- /dev/null
+++ b/src/messages/MOSDRepScrubMap.h
@@ -0,0 +1,84 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Sage Weil <sage@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MOSDREPSCRUBMAP_H
+#define CEPH_MOSDREPSCRUBMAP_H
+
+#include "MOSDFastDispatchOp.h"
+
+/*
+ * pass a ScrubMap from a shard back to the primary
+ */
+
+class MOSDRepScrubMap final : public MOSDFastDispatchOp {
+public:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+  spg_t pgid;            // primary spg_t
+  epoch_t map_epoch = 0;
+  pg_shard_t from;   // whose scrubmap this is
+  ceph::buffer::list scrub_map_bl;
+  bool preempted = false;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDRepScrubMap()
+    : MOSDFastDispatchOp{MSG_OSD_REP_SCRUBMAP, HEAD_VERSION, COMPAT_VERSION} {}
+
+  MOSDRepScrubMap(spg_t pgid, epoch_t map_epoch, pg_shard_t from)
+    : MOSDFastDispatchOp{MSG_OSD_REP_SCRUBMAP, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid),
+      map_epoch(map_epoch),
+      from(from) {}
+
+private:
+  ~MOSDRepScrubMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "rep_scrubmap"; }
+  void print(std::ostream& out) const override {
+    out << "rep_scrubmap(" << pgid << " e" << map_epoch
+	<< " from shard " << from
+	<< (preempted ? " PREEMPTED":"") << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(from, payload);
+    encode(preempted, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(from, p);
+    if (header.version >= 2) {
+      decode(preempted, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MOSDScrub2.h b/src/messages/MOSDScrub2.h
new file mode 100644
index 000000000..61bafba24
--- /dev/null
+++ b/src/messages/MOSDScrub2.h
@@ -0,0 +1,61 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+
+/*
+ * instruct an OSD to scrub some or all pg(s)
+ */
+
+class MOSDScrub2 final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  uuid_d fsid;
+  epoch_t epoch;
+  std::vector<spg_t> scrub_pgs;
+  bool repair = false;
+  bool deep = false;
+
+  MOSDScrub2() : Message{MSG_OSD_SCRUB2, HEAD_VERSION, COMPAT_VERSION} {}
+  MOSDScrub2(const uuid_d& f, epoch_t e, std::vector<spg_t>& pgs, bool r, bool d) :
+    Message{MSG_OSD_SCRUB2, HEAD_VERSION, COMPAT_VERSION},
+    fsid(f), epoch(e), scrub_pgs(pgs), repair(r), deep(d) {}
+private:
+  ~MOSDScrub2() final {}
+
+public:
+  std::string_view get_type_name() const override { return "scrub2"; }
+  void print(std::ostream& out) const override {
+    out << "scrub2(" << scrub_pgs;
+    if (repair)
+      out << " repair";
+    if (deep)
+      out << " deep";
+    out << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(fsid, payload);
+    encode(epoch, payload);
+    encode(scrub_pgs, payload);
+    encode(repair, payload);
+    encode(deep, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(epoch, p);
+    decode(scrub_pgs, p);
+    decode(repair, p);
+    decode(deep, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MOSDScrubReserve.h b/src/messages/MOSDScrubReserve.h
new file mode 100644
index 000000000..f1f76b3e6
--- /dev/null
+++ b/src/messages/MOSDScrubReserve.h
@@ -0,0 +1,99 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MOSDSCRUBRESERVE_H
+#define CEPH_MOSDSCRUBRESERVE_H
+
+#include "MOSDFastDispatchOp.h"
+
+class MOSDScrubReserve : public MOSDFastDispatchOp {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+public:
+  spg_t pgid;
+  epoch_t map_epoch;
+  enum {
+    REQUEST = 0,
+    GRANT = 1,
+    RELEASE = 2,
+    REJECT = 3,
+  };
+  int32_t type;
+  pg_shard_t from;
+
+  epoch_t get_map_epoch() const override {
+    return map_epoch;
+  }
+  spg_t get_spg() const override {
+    return pgid;
+  }
+
+  MOSDScrubReserve()
+    : MOSDFastDispatchOp{MSG_OSD_SCRUB_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      map_epoch(0), type(-1) {}
+  MOSDScrubReserve(spg_t pgid,
+		   epoch_t map_epoch,
+		   int type,
+		   pg_shard_t from)
+    : MOSDFastDispatchOp{MSG_OSD_SCRUB_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid), map_epoch(map_epoch),
+      type(type), from(from) {}
+
+  std::string_view get_type_name() const {
+    return "MOSDScrubReserve";
+  }
+
+  void print(std::ostream& out) const {
+    out << "MOSDScrubReserve(" << pgid << " ";
+    switch (type) {
+    case REQUEST:
+      out << "REQUEST ";
+      break;
+    case GRANT:
+      out << "GRANT ";
+      break;
+    case REJECT:
+      out << "REJECT ";
+      break;
+    case RELEASE:
+      out << "RELEASE ";
+      break;
+    }
+    out << "e" << map_epoch << ")";
+    return;
+  }
+
+  void decode_payload() {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pgid, p);
+    decode(map_epoch, p);
+    decode(type, p);
+    decode(from, p);
+  }
+
+  void encode_payload(uint64_t features) {
+    using ceph::encode;
+    encode(pgid, payload);
+    encode(map_epoch, payload);
+    encode(type, payload);
+    encode(from, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MPGStats.h b/src/messages/MPGStats.h
new file mode 100644
index 000000000..65cec5244
--- /dev/null
+++ b/src/messages/MPGStats.h
@@ -0,0 +1,77 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MPGSTATS_H
+#define CEPH_MPGSTATS_H
+
+#include "osd/osd_types.h"
+#include "messages/PaxosServiceMessage.h"
+
+class MPGStats final : public PaxosServiceMessage {
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  uuid_d fsid;
+  std::map<pg_t, pg_stat_t> pg_stat;
+  osd_stat_t osd_stat;
+  std::map<int64_t, store_statfs_t> pool_stat;
+  epoch_t epoch = 0;
+
+  MPGStats() : PaxosServiceMessage{MSG_PGSTATS, 0, HEAD_VERSION, COMPAT_VERSION} {}
+  MPGStats(const uuid_d& f, epoch_t e)
+    : PaxosServiceMessage{MSG_PGSTATS, 0, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f),
+      epoch(e)
+  {}
+
+private:
+  ~MPGStats() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_stats"; }
+  void print(std::ostream& out) const override {
+    out << "pg_stats(" << pg_stat.size() << " pgs seq " << osd_stat.seq << " v " << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(osd_stat, payload, features);
+    encode(pg_stat, payload);
+    encode(epoch, payload);
+    encode(utime_t{}, payload);
+    encode(pool_stat, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(osd_stat, p);
+    if (osd_stat.num_osds == 0) {
+      // for the benefit of legacy OSDs who don't set this field
+      osd_stat.num_osds = 1;
+    }
+    decode(pg_stat, p);
+    decode(epoch, p);
+    utime_t dummy;
+    decode(dummy, p);
+    if (header.version >= 2)
+      decode(pool_stat, p);
+  }
+};
+
+#endif
diff --git a/src/messages/MPGStatsAck.h b/src/messages/MPGStatsAck.h
new file mode 100644
index 000000000..03bade32b
--- /dev/null
+++ b/src/messages/MPGStatsAck.h
@@ -0,0 +1,49 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MPGSTATSACK_H
+#define CEPH_MPGSTATSACK_H
+
+#include "osd/osd_types.h"
+
+class MPGStatsAck final : public Message {
+public:
+  std::map<pg_t,std::pair<version_t,epoch_t> > pg_stat;
+
+  MPGStatsAck() : Message{MSG_PGSTATSACK} {}
+
+private:
+  ~MPGStatsAck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "pg_stats_ack"; }
+  void print(std::ostream& out) const override {
+    out << "pg_stats_ack(" << pg_stat.size() << " pgs tid " << get_tid() << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pg_stat, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(pg_stat, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MPing.h b/src/messages/MPing.h
new file mode 100644
index 000000000..bff4326ee
--- /dev/null
+++ b/src/messages/MPing.h
@@ -0,0 +1,33 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MPING_H
+#define CEPH_MPING_H
+
+#include "msg/Message.h"
+
+class MPing final : public Message {
+public:
+  MPing() : Message{CEPH_MSG_PING} {}
+private:
+  ~MPing() final {}
+
+public:
+  void decode_payload() override { }
+  void encode_payload(uint64_t features) override { }
+  std::string_view get_type_name() const override { return "ping"; }
+};
+
+#endif
diff --git a/src/messages/MPoolOp.h b/src/messages/MPoolOp.h
new file mode 100644
index 000000000..0e53c56b9
--- /dev/null
+++ b/src/messages/MPoolOp.h
@@ -0,0 +1,98 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MPOOLOP_H
+#define CEPH_MPOOLOP_H
+
+#include "messages/PaxosServiceMessage.h"
+
+
+class MPoolOp final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 4;
+  static constexpr int COMPAT_VERSION = 2;
+
+public:
+  uuid_d fsid;
+  __u32 pool = 0;
+  std::string name;
+  __u32 op = 0;
+  snapid_t snapid;
+  __s16 crush_rule = 0;
+
+  MPoolOp()
+    : PaxosServiceMessage{CEPH_MSG_POOLOP, 0, HEAD_VERSION, COMPAT_VERSION} {}
+  MPoolOp(const uuid_d& f, ceph_tid_t t, int p, std::string& n, int o, version_t v)
+    : PaxosServiceMessage{CEPH_MSG_POOLOP, v, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), pool(p), name(n), op(o),
+      snapid(0), crush_rule(0) {
+    set_tid(t);
+  }
+
+private:
+  ~MPoolOp() final {}
+
+public:
+  std::string_view get_type_name() const override { return "poolop"; }
+  void print(std::ostream& out) const override {
+    out << "pool_op(" << ceph_pool_op_name(op) << " pool " << pool
+	<< " tid " << get_tid()
+	<< " name " << name
+	<< " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(pool, payload);
+    encode(op, payload);
+    encode((uint64_t)0, payload);
+    encode(snapid, payload);
+    encode(name, payload);
+    __u8 pad = 0;
+    encode(pad, payload);  /* for v3->v4 encoding change */
+    encode(crush_rule, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(pool, p);
+    if (header.version < 2)
+      decode(name, p);
+    decode(op, p);
+    uint64_t old_auid;
+    decode(old_auid, p);
+    decode(snapid, p);
+    if (header.version >= 2)
+      decode(name, p);
+
+    if (header.version >= 3) {
+      __u8 pad;
+      decode(pad, p);
+      if (header.version >= 4)
+	decode(crush_rule, p);
+      else
+	crush_rule = pad;
+    } else
+      crush_rule = -1;
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MPoolOpReply.h b/src/messages/MPoolOpReply.h
new file mode 100644
index 000000000..59ec764af
--- /dev/null
+++ b/src/messages/MPoolOpReply.h
@@ -0,0 +1,85 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MPOOLOPREPLY_H
+#define CEPH_MPOOLOPREPLY_H
+
+#include "common/errno.h"
+
+class MPoolOpReply : public PaxosServiceMessage {
+public:
+  uuid_d fsid;
+  __u32 replyCode = 0;
+  epoch_t epoch = 0;
+  ceph::buffer::list response_data;
+
+  MPoolOpReply() : PaxosServiceMessage{CEPH_MSG_POOLOP_REPLY, 0}
+  {}
+  MPoolOpReply( uuid_d& f, ceph_tid_t t, int rc, int e, version_t v) :
+    PaxosServiceMessage{CEPH_MSG_POOLOP_REPLY, v},
+    fsid(f),
+    replyCode(rc),
+    epoch(e) {
+    set_tid(t);
+  }
+  MPoolOpReply(uuid_d& f, ceph_tid_t t, int rc, int e, version_t v,
+	       ceph::buffer::list *blp) :
+    PaxosServiceMessage{CEPH_MSG_POOLOP_REPLY, v},
+    fsid(f),
+    replyCode(rc),
+    epoch(e) {
+    set_tid(t);
+    if (blp)
+      response_data = std::move(*blp);
+  }
+
+  std::string_view get_type_name() const override { return "poolopreply"; }
+
+  void print(std::ostream& out) const override {
+    out << "pool_op_reply(tid " << get_tid()
+	<< " " << cpp_strerror(-replyCode)
+	<< " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(replyCode, payload);
+    encode(epoch, payload);
+    if (response_data.length()) {
+      encode(true, payload);
+      encode(response_data, payload);
+    } else
+      encode(false, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(replyCode, p);
+    decode(epoch, p);
+    bool has_response_data;
+    decode(has_response_data, p);
+    if (has_response_data) {
+      decode(response_data, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MRecoveryReserve.h b/src/messages/MRecoveryReserve.h
new file mode 100644
index 000000000..55fb2d81b
--- /dev/null
+++ b/src/messages/MRecoveryReserve.h
@@ -0,0 +1,133 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MRECOVERY_H
+#define CEPH_MRECOVERY_H
+
+#include "msg/Message.h"
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MRecoveryReserve : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 2;
+public:
+  spg_t pgid;
+  epoch_t query_epoch;
+  enum {
+    REQUEST = 0,   // primary->replica: please reserve slot
+    GRANT = 1,     // replica->primary: ok, i reserved it
+    RELEASE = 2,   // primary->replica: release the slot i reserved before
+    REVOKE = 3,    // replica->primary: i'm taking back the slot i gave you
+  };
+  uint32_t type;
+  uint32_t priority = 0;
+
+  spg_t get_spg() const {
+    return pgid;
+  }
+  epoch_t get_map_epoch() const {
+    return query_epoch;
+  }
+  epoch_t get_min_epoch() const {
+    return query_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    switch (type) {
+    case REQUEST:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RequestRecoveryPrio(priority));
+    case GRANT:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RemoteRecoveryReserved());
+    case RELEASE:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	RecoveryDone());
+    case REVOKE:
+      return new PGPeeringEvent(
+	query_epoch,
+	query_epoch,
+	DeferRecovery(0.0));
+    default:
+      ceph_abort();
+    }
+  }
+
+  MRecoveryReserve()
+    : MOSDPeeringOp{MSG_OSD_RECOVERY_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      query_epoch(0), type(-1) {}
+  MRecoveryReserve(int type,
+		   spg_t pgid,
+		   epoch_t query_epoch,
+		   unsigned prio = 0)
+    : MOSDPeeringOp{MSG_OSD_RECOVERY_RESERVE, HEAD_VERSION, COMPAT_VERSION},
+      pgid(pgid), query_epoch(query_epoch),
+      type(type), priority(prio) {}
+
+  std::string_view get_type_name() const override {
+    return "MRecoveryReserve";
+  }
+
+  void inner_print(std::ostream& out) const override {
+    switch (type) {
+    case REQUEST:
+      out << "REQUEST";
+      break;
+    case GRANT:
+      out << "GRANT";
+      break;
+    case RELEASE:
+      out << "RELEASE";
+      break;
+    case REVOKE:
+      out << "REVOKE";
+      break;
+    }
+    if (type == REQUEST) out << " prio: " << priority;
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(pgid.pgid, p);
+    decode(query_epoch, p);
+    decode(type, p);
+    decode(pgid.shard, p);
+    if (header.version >= 3) {
+      decode(priority, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(pgid.pgid, payload);
+    encode(query_epoch, payload);
+    encode(type, payload);
+    encode(pgid.shard, payload);
+    encode(priority, payload);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MRemoveSnaps.h b/src/messages/MRemoveSnaps.h
new file mode 100644
index 000000000..a735b2a9d
--- /dev/null
+++ b/src/messages/MRemoveSnaps.h
@@ -0,0 +1,58 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MREMOVESNAPS_H
+#define CEPH_MREMOVESNAPS_H
+
+#include "messages/PaxosServiceMessage.h"
+
+class MRemoveSnaps final : public PaxosServiceMessage {
+public:
+  std::map<int32_t, std::vector<snapid_t>> snaps;
+
+protected:
+  MRemoveSnaps() :
+    PaxosServiceMessage{MSG_REMOVE_SNAPS, 0} { }
+  MRemoveSnaps(std::map<int, std::vector<snapid_t>>& s) : 
+    PaxosServiceMessage{MSG_REMOVE_SNAPS, 0} {
+    snaps.swap(s);
+  }
+  ~MRemoveSnaps() final {}
+
+public:
+  std::string_view get_type_name() const override { return "remove_snaps"; }
+  void print(std::ostream& out) const override {
+    out << "remove_snaps(" << snaps << " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(snaps, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(snaps, p);
+    ceph_assert(p.end());
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+  template<class T, typename... Args>
+  friend MURef<T> crimson::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MRoute.h b/src/messages/MRoute.h
new file mode 100644
index 000000000..4154434af
--- /dev/null
+++ b/src/messages/MRoute.h
@@ -0,0 +1,90 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+
+#ifndef CEPH_MROUTE_H
+#define CEPH_MROUTE_H
+
+#include "msg/Message.h"
+#include "include/encoding.h"
+
+class MRoute final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 3;
+
+  uint64_t session_mon_tid;
+  Message *msg;
+  epoch_t send_osdmap_first;
+  
+  MRoute() : Message{MSG_ROUTE, HEAD_VERSION, COMPAT_VERSION},
+	     session_mon_tid(0),
+	     msg(NULL),
+	     send_osdmap_first(0) {}
+  MRoute(uint64_t t, Message *m)
+    : Message{MSG_ROUTE, HEAD_VERSION, COMPAT_VERSION},
+      session_mon_tid(t),
+      msg(m),
+      send_osdmap_first(0) {}
+private:
+  ~MRoute() final {
+    if (msg)
+      msg->put();
+  }
+
+public:
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(session_mon_tid, p);
+    entity_inst_t dest_unused;
+    decode(dest_unused, p);
+    bool m;
+    decode(m, p);
+    if (m)
+      msg = decode_message(NULL, 0, p);
+    decode(send_osdmap_first, p);
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(session_mon_tid, payload);
+    entity_inst_t dest_unused;
+    encode(dest_unused, payload, features);
+    bool m = msg ? true : false;
+    encode(m, payload);
+    if (msg)
+      encode_message(msg, features, payload);
+    encode(send_osdmap_first, payload);
+  }
+
+  std::string_view get_type_name() const override { return "route"; }
+  void print(std::ostream& o) const override {
+    if (msg)
+      o << "route(" << *msg;
+    else
+      o << "route(no-reply";
+    if (send_osdmap_first)
+      o << " send_osdmap_first " << send_osdmap_first;
+    if (session_mon_tid)
+      o << " tid " << session_mon_tid << ")";
+    else
+      o << " tid (none)";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MServiceMap.h b/src/messages/MServiceMap.h
new file mode 100644
index 000000000..05954354a
--- /dev/null
+++ b/src/messages/MServiceMap.h
@@ -0,0 +1,39 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "msg/Message.h"
+#include "mgr/ServiceMap.h"
+
+class MServiceMap final : public Message {
+public:
+  ServiceMap service_map;
+
+  MServiceMap() : Message{MSG_SERVICE_MAP} { }
+  explicit MServiceMap(const ServiceMap& sm)
+    : Message{MSG_SERVICE_MAP},
+      service_map(sm) {
+  }
+private:
+  ~MServiceMap() final {}
+
+public:
+  std::string_view get_type_name() const override { return "service_map"; }
+  void print(std::ostream& out) const override {
+    out << "service_map(e" << service_map.epoch << " "
+	<< service_map.services.size() << " svc)";
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(service_map, payload, features);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(service_map, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MStatfs.h b/src/messages/MStatfs.h
new file mode 100644
index 000000000..46a9a3748
--- /dev/null
+++ b/src/messages/MStatfs.h
@@ -0,0 +1,72 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MSTATFS_H
+#define CEPH_MSTATFS_H
+
+#include <optional>
+#include <sys/statvfs.h>    /* or <sys/statfs.h> */
+#include "messages/PaxosServiceMessage.h"
+
+class MStatfs final : public PaxosServiceMessage {
+private:
+  static constexpr int HEAD_VERSION = 2;
+  static constexpr int COMPAT_VERSION = 1;
+
+public:
+  uuid_d fsid;
+  std::optional<int64_t> data_pool;
+
+  MStatfs() : PaxosServiceMessage{CEPH_MSG_STATFS, 0, HEAD_VERSION, COMPAT_VERSION} {}
+  MStatfs(const uuid_d& f, ceph_tid_t t, std::optional<int64_t> _data_pool,
+	  version_t v)
+    : PaxosServiceMessage{CEPH_MSG_STATFS, v, HEAD_VERSION, COMPAT_VERSION},
+      fsid(f), data_pool(_data_pool) {
+    set_tid(t);
+  }
+
+private:
+  ~MStatfs() final {}
+
+public:
+  std::string_view get_type_name() const override { return "statfs"; }
+  void print(std::ostream& out) const override {
+    out << "statfs(" << get_tid() << " pool "
+        << (data_pool ? *data_pool : -1) << " v" << version << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(data_pool, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    if (header.version >= 2) {
+      decode(data_pool, p);
+    } else {
+      data_pool = std::optional<int64_t> ();
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MStatfsReply.h b/src/messages/MStatfsReply.h
new file mode 100644
index 000000000..3bdcfe0a7
--- /dev/null
+++ b/src/messages/MStatfsReply.h
@@ -0,0 +1,49 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MSTATFSREPLY_H
+#define CEPH_MSTATFSREPLY_H
+
+class MStatfsReply : public Message {
+public:
+  struct ceph_mon_statfs_reply h{};
+
+  MStatfsReply() : Message{CEPH_MSG_STATFS_REPLY} {}
+  MStatfsReply(uuid_d &f, ceph_tid_t t, epoch_t epoch)
+    : Message{CEPH_MSG_STATFS_REPLY} {
+    memcpy(&h.fsid, f.bytes(), sizeof(h.fsid));
+    header.tid = t;
+    h.version = epoch;
+  }
+
+  std::string_view get_type_name() const override { return "statfs_reply"; }
+  void print(std::ostream& out) const override {
+    out << "statfs_reply(" << header.tid << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(h, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(h, p);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/MTimeCheck.h b/src/messages/MTimeCheck.h
new file mode 100644
index 000000000..03cd157f2
--- /dev/null
+++ b/src/messages/MTimeCheck.h
@@ -0,0 +1,92 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2012 Inktank, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MTIMECHECK_H
+#define CEPH_MTIMECHECK_H
+
+class MTimeCheck final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+
+  enum {
+    OP_PING = 1,
+    OP_PONG = 2,
+    OP_REPORT = 3,
+  };
+
+  int op = 0;
+  version_t epoch = 0;
+  version_t round = 0;
+
+  utime_t timestamp;
+  map<entity_inst_t, double> skews;
+  map<entity_inst_t, double> latencies;
+
+  MTimeCheck() : Message{MSG_TIMECHECK, HEAD_VERSION} {}
+  MTimeCheck(int op) :
+    Message{MSG_TIMECHECK, HEAD_VERSION},
+    op(op)
+  {}
+
+private:
+  ~MTimeCheck() final {}
+
+public:
+  std::string_view get_type_name() const override { return "time_check"; }
+  const char *get_op_name() const {
+    switch (op) {
+    case OP_PING: return "ping";
+    case OP_PONG: return "pong";
+    case OP_REPORT: return "report";
+    }
+    return "???";
+  }
+  void print(std::ostream &o) const override {
+    o << "time_check( " << get_op_name()
+      << " e " << epoch << " r " << round;
+    if (op == OP_PONG) {
+      o << " ts " << timestamp;
+    } else if (op == OP_REPORT) {
+      o << " #skews " << skews.size()
+        << " #latencies " << latencies.size();
+    }
+    o << " )";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(epoch, p);
+    decode(round, p);
+    decode(timestamp, p);
+    decode(skews, p);
+    decode(latencies, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(epoch, payload);
+    encode(round, payload);
+    encode(timestamp, payload);
+    encode(skews, payload, features);
+    encode(latencies, payload, features);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif /* CEPH_MTIMECHECK_H */
diff --git a/src/messages/MTimeCheck2.h b/src/messages/MTimeCheck2.h
new file mode 100644
index 000000000..8d9c4215f
--- /dev/null
+++ b/src/messages/MTimeCheck2.h
@@ -0,0 +1,90 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2012 Inktank, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#pragma once
+
+class MTimeCheck2 final : public Message {
+public:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  enum {
+    OP_PING = 1,
+    OP_PONG = 2,
+    OP_REPORT = 3,
+  };
+
+  int op = 0;
+  version_t epoch = 0;
+  version_t round = 0;
+
+  utime_t timestamp;
+  std::map<int, double> skews;
+  std::map<int, double> latencies;
+
+  MTimeCheck2() : Message{MSG_TIMECHECK2, HEAD_VERSION, COMPAT_VERSION} { }
+  MTimeCheck2(int op) :
+    Message{MSG_TIMECHECK2, HEAD_VERSION, COMPAT_VERSION},
+    op(op)
+  { }
+
+private:
+  ~MTimeCheck2() final { }
+
+public:
+  std::string_view get_type_name() const override { return "time_check2"; }
+  const char *get_op_name() const {
+    switch (op) {
+    case OP_PING: return "ping";
+    case OP_PONG: return "pong";
+    case OP_REPORT: return "report";
+    }
+    return "???";
+  }
+  void print(std::ostream &o) const override {
+    o << "time_check( " << get_op_name()
+      << " e " << epoch << " r " << round;
+    if (op == OP_PONG) {
+      o << " ts " << timestamp;
+    } else if (op == OP_REPORT) {
+      o << " #skews " << skews.size()
+        << " #latencies " << latencies.size();
+    }
+    o << " )";
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(epoch, p);
+    decode(round, p);
+    decode(timestamp, p);
+    decode(skews, p);
+    decode(latencies, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(epoch, payload);
+    encode(round, payload);
+    encode(timestamp, payload);
+    encode(skews, payload, features);
+    encode(latencies, payload, features);
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
diff --git a/src/messages/MWatchNotify.h b/src/messages/MWatchNotify.h
new file mode 100644
index 000000000..971c860c7
--- /dev/null
+++ b/src/messages/MWatchNotify.h
@@ -0,0 +1,98 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_MWATCHNOTIFY_H
+#define CEPH_MWATCHNOTIFY_H
+
+#include "msg/Message.h"
+
+
+class MWatchNotify final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 3;
+  static constexpr int COMPAT_VERSION = 1;
+
+ public:
+  uint64_t cookie;     ///< client unique id for this watch or notify
+  uint64_t ver;        ///< unused
+  uint64_t notify_id;  ///< osd unique id for a notify notification
+  uint8_t opcode;      ///< CEPH_WATCH_EVENT_*
+  ceph::buffer::list bl;       ///< notify payload (osd->client)
+  errorcode32_t return_code; ///< notify result (osd->client)
+  uint64_t notifier_gid; ///< who sent the notify
+
+  MWatchNotify()
+    : Message{CEPH_MSG_WATCH_NOTIFY, HEAD_VERSION, COMPAT_VERSION} { }
+  MWatchNotify(uint64_t c, uint64_t v, uint64_t i, uint8_t o, ceph::buffer::list b, uint64_t n=0)
+    : Message{CEPH_MSG_WATCH_NOTIFY, HEAD_VERSION, COMPAT_VERSION},
+      cookie(c),
+      ver(v),
+      notify_id(i),
+      opcode(o),
+      bl(b),
+      return_code(0),
+      notifier_gid(n) { }
+private:
+  ~MWatchNotify() final {}
+
+public:
+  void decode_payload() override {
+    using ceph::decode;
+    uint8_t msg_ver;
+    auto p = payload.cbegin();
+    decode(msg_ver, p);
+    decode(opcode, p);
+    decode(cookie, p);
+    decode(ver, p);
+    decode(notify_id, p);
+    if (msg_ver >= 1)
+      decode(bl, p);
+    if (header.version >= 2)
+      decode(return_code, p);
+    else
+      return_code = 0;
+    if (header.version >= 3)
+      decode(notifier_gid, p);
+    else
+      notifier_gid = 0;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    uint8_t msg_ver = 1;
+    encode(msg_ver, payload);
+    encode(opcode, payload);
+    encode(cookie, payload);
+    encode(ver, payload);
+    encode(notify_id, payload);
+    encode(bl, payload);
+    encode(return_code, payload);
+    encode(notifier_gid, payload);
+  }
+
+  std::string_view get_type_name() const override { return "watch-notify"; }
+  void print(std::ostream& out) const override {
+    out << "watch-notify("
+	<< ceph_watch_event_name(opcode) << " (" << (int)opcode << ")"
+	<< " cookie " << cookie
+	<< " notify " << notify_id
+	<< " ret " << return_code
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif
diff --git a/src/messages/PaxosServiceMessage.h b/src/messages/PaxosServiceMessage.h
new file mode 100644
index 000000000..a2b1ddf4e
--- /dev/null
+++ b/src/messages/PaxosServiceMessage.h
@@ -0,0 +1,59 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+
+#ifndef CEPH_PAXOSSERVICEMESSAGE_H
+#define CEPH_PAXOSSERVICEMESSAGE_H
+
+#include "msg/Message.h"
+#include "mon/Session.h"
+
+class PaxosServiceMessage : public Message {
+public:
+  version_t version;
+  __s16 deprecated_session_mon;
+  uint64_t deprecated_session_mon_tid;
+
+  // track which epoch the leader received a forwarded request in, so we can
+  // discard forwarded requests appropriately on election boundaries.
+  epoch_t rx_election_epoch;
+
+  PaxosServiceMessage()
+    : Message{MSG_PAXOS},
+      version(0), deprecated_session_mon(-1), deprecated_session_mon_tid(0),
+      rx_election_epoch(0) { }
+  PaxosServiceMessage(int type, version_t v, int enc_version=1, int compat_enc_version=0)
+    : Message{type, enc_version, compat_enc_version},
+      version(v), deprecated_session_mon(-1), deprecated_session_mon_tid(0),
+      rx_election_epoch(0)  { }
+ protected:
+  ~PaxosServiceMessage() override {}
+
+ public:
+  void paxos_encode() {
+    using ceph::encode;
+    encode(version, payload);
+    encode(deprecated_session_mon, payload);
+    encode(deprecated_session_mon_tid, payload);
+  }
+
+  void paxos_decode(ceph::buffer::list::const_iterator& p ) {
+    using ceph::decode;
+    decode(version, p);
+    decode(deprecated_session_mon, p);
+    decode(deprecated_session_mon_tid, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    ceph_abort();
+    paxos_encode();
+  }
+
+  void decode_payload() override {
+    ceph_abort();
+    auto p = payload.cbegin();
+    paxos_decode(p);
+  }
+
+  std::string_view get_type_name() const override { return "PaxosServiceMessage"; }
+};
+
+#endif