Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

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

1 files changed, 2152 insertions, 0 deletions

diff --git a/src/osd/OSD.h b/src/osd/OSD.h
new file mode 100644
index 000000000..efbcb40f7
--- /dev/null
+++ b/src/osd/OSD.h
@@ -0,0 +1,2152 @@
+// -*- 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_OSD_H
+#define CEPH_OSD_H
+
+#include "PG.h"
+
+#include "msg/Dispatcher.h"
+
+#include "common/async/context_pool.h"
+#include "common/Timer.h"
+#include "common/WorkQueue.h"
+#include "common/AsyncReserver.h"
+#include "common/ceph_context.h"
+#include "common/config_cacher.h"
+#include "common/zipkin_trace.h"
+#include "common/ceph_timer.h"
+
+#include "mgr/MgrClient.h"
+
+#include "os/ObjectStore.h"
+
+#include "include/CompatSet.h"
+#include "include/common_fwd.h"
+
+#include "OpRequest.h"
+#include "Session.h"
+
+#include "osd/scheduler/OpScheduler.h"
+
+#include <atomic>
+#include <map>
+#include <memory>
+#include <string>
+
+#include "include/unordered_map.h"
+
+#include "common/shared_cache.hpp"
+#include "common/simple_cache.hpp"
+#include "messages/MOSDOp.h"
+#include "common/EventTrace.h"
+#include "osd/osd_perf_counters.h"
+#include "common/Finisher.h"
+
+#define CEPH_OSD_PROTOCOL    10 /* cluster internal */
+
+/*
+
+  lock ordering for pg map
+
+    PG::lock
+      ShardData::lock
+        OSD::pg_map_lock
+
+  */
+
+class Messenger;
+class Message;
+class MonClient;
+class ObjectStore;
+class FuseStore;
+class OSDMap;
+class MLog;
+class Objecter;
+class KeyStore;
+
+class Watch;
+class PrimaryLogPG;
+
+class TestOpsSocketHook;
+struct C_FinishSplits;
+struct C_OpenPGs;
+class LogChannel;
+
+class MOSDPGCreate2;
+class MOSDPGQuery;
+class MOSDPGNotify;
+class MOSDPGInfo;
+class MOSDPGRemove;
+class MOSDForceRecovery;
+class MMonGetPurgedSnapsReply;
+
+class OSD;
+
+class OSDService {
+  using OpSchedulerItem = ceph::osd::scheduler::OpSchedulerItem;
+public:
+  OSD *osd;
+  CephContext *cct;
+  ObjectStore::CollectionHandle meta_ch;
+  const int whoami;
+  ObjectStore *&store;
+  LogClient &log_client;
+  LogChannelRef clog;
+  PGRecoveryStats &pg_recovery_stats;
+private:
+  Messenger *&cluster_messenger;
+  Messenger *&client_messenger;
+public:
+  PerfCounters *&logger;
+  PerfCounters *&recoverystate_perf;
+  MonClient   *&monc;
+
+  md_config_cacher_t<Option::size_t> osd_max_object_size;
+  md_config_cacher_t<bool> osd_skip_data_digest;
+
+  void enqueue_back(OpSchedulerItem&& qi);
+  void enqueue_front(OpSchedulerItem&& qi);
+
+  void maybe_inject_dispatch_delay() {
+    if (g_conf()->osd_debug_inject_dispatch_delay_probability > 0) {
+      if (rand() % 10000 <
+	  g_conf()->osd_debug_inject_dispatch_delay_probability * 10000) {
+	utime_t t;
+	t.set_from_double(g_conf()->osd_debug_inject_dispatch_delay_duration);
+	t.sleep();
+      }
+    }
+  }
+
+  ceph::signedspan get_mnow();
+
+private:
+  // -- superblock --
+  ceph::mutex publish_lock, pre_publish_lock; // pre-publish orders before publish
+  OSDSuperblock superblock;
+
+public:
+  OSDSuperblock get_superblock() {
+    std::lock_guard l(publish_lock);
+    return superblock;
+  }
+  void publish_superblock(const OSDSuperblock &block) {
+    std::lock_guard l(publish_lock);
+    superblock = block;
+  }
+
+  int get_nodeid() const { return whoami; }
+
+  std::atomic<epoch_t> max_oldest_map;
+private:
+  OSDMapRef osdmap;
+
+public:
+  OSDMapRef get_osdmap() {
+    std::lock_guard l(publish_lock);
+    return osdmap;
+  }
+  epoch_t get_osdmap_epoch() {
+    std::lock_guard l(publish_lock);
+    return osdmap ? osdmap->get_epoch() : 0;
+  }
+  void publish_map(OSDMapRef map) {
+    std::lock_guard l(publish_lock);
+    osdmap = map;
+  }
+
+  /*
+   * osdmap - current published std::map
+   * next_osdmap - pre_published std::map that is about to be published.
+   *
+   * We use the next_osdmap to send messages and initiate connections,
+   * but only if the target is the same instance as the one in the std::map
+   * epoch the current user is working from (i.e., the result is
+   * equivalent to what is in next_osdmap).
+   *
+   * This allows the helpers to start ignoring osds that are about to
+   * go down, and let OSD::handle_osd_map()/note_down_osd() mark them
+   * down, without worrying about reopening connections from threads
+   * working from old maps.
+   */
+private:
+  OSDMapRef next_osdmap;
+  ceph::condition_variable pre_publish_cond;
+  int pre_publish_waiter = 0;
+
+public:
+  void pre_publish_map(OSDMapRef map) {
+    std::lock_guard l(pre_publish_lock);
+    next_osdmap = std::move(map);
+  }
+
+  void activate_map();
+  /// map epochs reserved below
+  std::map<epoch_t, unsigned> map_reservations;
+
+  /// gets ref to next_osdmap and registers the epoch as reserved
+  OSDMapRef get_nextmap_reserved() {
+    std::lock_guard l(pre_publish_lock);
+    epoch_t e = next_osdmap->get_epoch();
+    std::map<epoch_t, unsigned>::iterator i =
+      map_reservations.insert(std::make_pair(e, 0)).first;
+    i->second++;
+    return next_osdmap;
+  }
+  /// releases reservation on map
+  void release_map(OSDMapRef osdmap) {
+    std::lock_guard l(pre_publish_lock);
+    std::map<epoch_t, unsigned>::iterator i =
+      map_reservations.find(osdmap->get_epoch());
+    ceph_assert(i != map_reservations.end());
+    ceph_assert(i->second > 0);
+    if (--(i->second) == 0) {
+      map_reservations.erase(i);
+    }
+    if (pre_publish_waiter) {
+      pre_publish_cond.notify_all();
+    }
+  }
+  /// blocks until there are no reserved maps prior to next_osdmap
+  void await_reserved_maps() {
+    std::unique_lock l{pre_publish_lock};
+    ceph_assert(next_osdmap);
+    pre_publish_waiter++;
+    pre_publish_cond.wait(l, [this] {
+      auto i = map_reservations.cbegin();
+      return (i == map_reservations.cend() ||
+	      i->first >= next_osdmap->get_epoch());
+    });
+    pre_publish_waiter--;
+  }
+  OSDMapRef get_next_osdmap() {
+    std::lock_guard l(pre_publish_lock);
+    return next_osdmap;
+  }
+
+  void maybe_share_map(Connection *con,
+		       const OSDMapRef& osdmap,
+		       epoch_t peer_epoch_lb=0);
+
+  void send_map(class MOSDMap *m, Connection *con);
+  void send_incremental_map(epoch_t since, Connection *con,
+			    const OSDMapRef& osdmap);
+  MOSDMap *build_incremental_map_msg(epoch_t from, epoch_t to,
+                                       OSDSuperblock& superblock);
+
+  ConnectionRef get_con_osd_cluster(int peer, epoch_t from_epoch);
+  std::pair<ConnectionRef,ConnectionRef> get_con_osd_hb(int peer, epoch_t from_epoch);  // (back, front)
+  void send_message_osd_cluster(int peer, Message *m, epoch_t from_epoch);
+  void send_message_osd_cluster(std::vector<std::pair<int, Message*>>& messages, epoch_t from_epoch);
+  void send_message_osd_cluster(MessageRef m, Connection *con) {
+    con->send_message2(std::move(m));
+  }
+  void send_message_osd_cluster(Message *m, const ConnectionRef& con) {
+    con->send_message(m);
+  }
+  void send_message_osd_client(Message *m, const ConnectionRef& con) {
+    con->send_message(m);
+  }
+  entity_name_t get_cluster_msgr_name() const;
+
+private:
+  // -- scrub scheduling --
+  ceph::mutex sched_scrub_lock = ceph::make_mutex("OSDService::sched_scrub_lock");
+  int scrubs_local;
+  int scrubs_remote;
+
+public:
+  struct ScrubJob {
+    CephContext* cct;
+    /// pg to be scrubbed
+    spg_t pgid;
+    /// a time scheduled for scrub. but the scrub could be delayed if system
+    /// load is too high or it fails to fall in the scrub hours
+    utime_t sched_time;
+    /// the hard upper bound of scrub time
+    utime_t deadline;
+    ScrubJob() : cct(nullptr) {}
+    explicit ScrubJob(CephContext* cct, const spg_t& pg,
+		      const utime_t& timestamp,
+		      double pool_scrub_min_interval = 0,
+		      double pool_scrub_max_interval = 0, bool must = true);
+    /// order the jobs by sched_time
+    bool operator<(const ScrubJob& rhs) const;
+  };
+  std::set<ScrubJob> sched_scrub_pg;
+
+  /// @returns the scrub_reg_stamp used for unregistering the scrub job
+  utime_t reg_pg_scrub(spg_t pgid,
+		       utime_t t,
+		       double pool_scrub_min_interval,
+		       double pool_scrub_max_interval,
+		       bool must) {
+    ScrubJob scrub_job(cct, pgid, t, pool_scrub_min_interval, pool_scrub_max_interval,
+		       must);
+    std::lock_guard l(OSDService::sched_scrub_lock);
+    sched_scrub_pg.insert(scrub_job);
+    return scrub_job.sched_time;
+  }
+
+  void unreg_pg_scrub(spg_t pgid, utime_t t) {
+    std::lock_guard l(sched_scrub_lock);
+    size_t removed = sched_scrub_pg.erase(ScrubJob(cct, pgid, t));
+    ceph_assert(removed);
+  }
+
+  bool first_scrub_stamp(ScrubJob *out) {
+    std::lock_guard l(sched_scrub_lock);
+    if (sched_scrub_pg.empty())
+      return false;
+    std::set<ScrubJob>::iterator iter = sched_scrub_pg.begin();
+    *out = *iter;
+    return true;
+  }
+  bool next_scrub_stamp(const ScrubJob& next,
+			ScrubJob *out) {
+    std::lock_guard l(sched_scrub_lock);
+    if (sched_scrub_pg.empty())
+      return false;
+    std::set<ScrubJob>::const_iterator iter = sched_scrub_pg.upper_bound(next);
+    if (iter == sched_scrub_pg.cend())
+      return false;
+    *out = *iter;
+    return true;
+  }
+
+  void dumps_scrub(ceph::Formatter* f);
+
+  bool can_inc_scrubs();
+  bool inc_scrubs_local();
+  void dec_scrubs_local();
+  bool inc_scrubs_remote();
+  void dec_scrubs_remote();
+  void dump_scrub_reservations(ceph::Formatter *f);
+
+  void reply_op_error(OpRequestRef op, int err);
+  void reply_op_error(OpRequestRef op, int err, eversion_t v, version_t uv,
+		      std::vector<pg_log_op_return_item_t> op_returns);
+  void handle_misdirected_op(PG *pg, OpRequestRef op);
+
+
+private:
+  // -- agent shared state --
+  ceph::mutex agent_lock = ceph::make_mutex("OSDService::agent_lock");
+  ceph::condition_variable agent_cond;
+  std::map<uint64_t, std::set<PGRef> > agent_queue;
+  std::set<PGRef>::iterator agent_queue_pos;
+  bool agent_valid_iterator;
+  int agent_ops;
+  int flush_mode_high_count; //once have one pg with FLUSH_MODE_HIGH then flush objects with high speed
+  std::set<hobject_t> agent_oids;
+  bool agent_active;
+  struct AgentThread : public Thread {
+    OSDService *osd;
+    explicit AgentThread(OSDService *o) : osd(o) {}
+    void *entry() override {
+      osd->agent_entry();
+      return NULL;
+    }
+  } agent_thread;
+  bool agent_stop_flag;
+  ceph::mutex agent_timer_lock = ceph::make_mutex("OSDService::agent_timer_lock");
+  SafeTimer agent_timer;
+
+public:
+  void agent_entry();
+  void agent_stop();
+
+  void _enqueue(PG *pg, uint64_t priority) {
+    if (!agent_queue.empty() &&
+	agent_queue.rbegin()->first < priority)
+      agent_valid_iterator = false;  // inserting higher-priority queue
+    std::set<PGRef>& nq = agent_queue[priority];
+    if (nq.empty())
+      agent_cond.notify_all();
+    nq.insert(pg);
+  }
+
+  void _dequeue(PG *pg, uint64_t old_priority) {
+    std::set<PGRef>& oq = agent_queue[old_priority];
+    std::set<PGRef>::iterator p = oq.find(pg);
+    ceph_assert(p != oq.end());
+    if (p == agent_queue_pos)
+      ++agent_queue_pos;
+    oq.erase(p);
+    if (oq.empty()) {
+      if (agent_queue.rbegin()->first == old_priority)
+	agent_valid_iterator = false;
+      agent_queue.erase(old_priority);
+    }
+  }
+
+  /// enable agent for a pg
+  void agent_enable_pg(PG *pg, uint64_t priority) {
+    std::lock_guard l(agent_lock);
+    _enqueue(pg, priority);
+  }
+
+  /// adjust priority for an enagled pg
+  void agent_adjust_pg(PG *pg, uint64_t old_priority, uint64_t new_priority) {
+    std::lock_guard l(agent_lock);
+    ceph_assert(new_priority != old_priority);
+    _enqueue(pg, new_priority);
+    _dequeue(pg, old_priority);
+  }
+
+  /// disable agent for a pg
+  void agent_disable_pg(PG *pg, uint64_t old_priority) {
+    std::lock_guard l(agent_lock);
+    _dequeue(pg, old_priority);
+  }
+
+  /// note start of an async (evict) op
+  void agent_start_evict_op() {
+    std::lock_guard l(agent_lock);
+    ++agent_ops;
+  }
+
+  /// note finish or cancellation of an async (evict) op
+  void agent_finish_evict_op() {
+    std::lock_guard l(agent_lock);
+    ceph_assert(agent_ops > 0);
+    --agent_ops;
+    agent_cond.notify_all();
+  }
+
+  /// note start of an async (flush) op
+  void agent_start_op(const hobject_t& oid) {
+    std::lock_guard l(agent_lock);
+    ++agent_ops;
+    ceph_assert(agent_oids.count(oid) == 0);
+    agent_oids.insert(oid);
+  }
+
+  /// note finish or cancellation of an async (flush) op
+  void agent_finish_op(const hobject_t& oid) {
+    std::lock_guard l(agent_lock);
+    ceph_assert(agent_ops > 0);
+    --agent_ops;
+    ceph_assert(agent_oids.count(oid) == 1);
+    agent_oids.erase(oid);
+    agent_cond.notify_all();
+  }
+
+  /// check if we are operating on an object
+  bool agent_is_active_oid(const hobject_t& oid) {
+    std::lock_guard l(agent_lock);
+    return agent_oids.count(oid);
+  }
+
+  /// get count of active agent ops
+  int agent_get_num_ops() {
+    std::lock_guard l(agent_lock);
+    return agent_ops;
+  }
+
+  void agent_inc_high_count() {
+    std::lock_guard l(agent_lock);
+    flush_mode_high_count ++;
+  }
+
+  void agent_dec_high_count() {
+    std::lock_guard l(agent_lock);
+    flush_mode_high_count --;
+  }
+
+private:
+  /// throttle promotion attempts
+  std::atomic<unsigned int> promote_probability_millis{1000}; ///< probability thousands. one word.
+  PromoteCounter promote_counter;
+  utime_t last_recalibrate;
+  unsigned long promote_max_objects, promote_max_bytes;
+
+public:
+  bool promote_throttle() {
+    // NOTE: lockless!  we rely on the probability being a single word.
+    promote_counter.attempt();
+    if ((unsigned)rand() % 1000 > promote_probability_millis)
+      return true;  // yes throttle (no promote)
+    if (promote_max_objects &&
+	promote_counter.objects > promote_max_objects)
+      return true;  // yes throttle
+    if (promote_max_bytes &&
+	promote_counter.bytes > promote_max_bytes)
+      return true;  // yes throttle
+    return false;   //  no throttle (promote)
+  }
+  void promote_finish(uint64_t bytes) {
+    promote_counter.finish(bytes);
+  }
+  void promote_throttle_recalibrate();
+  unsigned get_num_shards() const {
+    return m_objecter_finishers;
+  }
+  Finisher* get_objecter_finisher(int shard) {
+    return objecter_finishers[shard].get();
+  }
+
+  // -- Objecter, for tiering reads/writes from/to other OSDs --
+  ceph::async::io_context_pool& poolctx;
+  std::unique_ptr<Objecter> objecter;
+  int m_objecter_finishers;
+  std::vector<std::unique_ptr<Finisher>> objecter_finishers;
+
+  // -- Watch --
+  ceph::mutex watch_lock = ceph::make_mutex("OSDService::watch_lock");
+  SafeTimer watch_timer;
+  uint64_t next_notif_id;
+  uint64_t get_next_id(epoch_t cur_epoch) {
+    std::lock_guard l(watch_lock);
+    return (((uint64_t)cur_epoch) << 32) | ((uint64_t)(next_notif_id++));
+  }
+
+  // -- Recovery/Backfill Request Scheduling --
+  ceph::mutex recovery_request_lock = ceph::make_mutex("OSDService::recovery_request_lock");
+  SafeTimer recovery_request_timer;
+
+  // For async recovery sleep
+  bool recovery_needs_sleep = true;
+  ceph::real_clock::time_point recovery_schedule_time;
+
+  // For recovery & scrub & snap
+  ceph::mutex sleep_lock = ceph::make_mutex("OSDService::sleep_lock");
+  SafeTimer sleep_timer;
+
+  // -- tids --
+  // for ops i issue
+  std::atomic<unsigned int> last_tid{0};
+  ceph_tid_t get_tid() {
+    return (ceph_tid_t)last_tid++;
+  }
+
+  // -- backfill_reservation --
+  Finisher reserver_finisher;
+  AsyncReserver<spg_t, Finisher> local_reserver;
+  AsyncReserver<spg_t, Finisher> remote_reserver;
+
+  // -- pg merge --
+  ceph::mutex merge_lock = ceph::make_mutex("OSD::merge_lock");
+  std::map<pg_t,eversion_t> ready_to_merge_source;   // pg -> version
+  std::map<pg_t,std::tuple<eversion_t,epoch_t,epoch_t>> ready_to_merge_target;  // pg -> (version,les,lec)
+  std::set<pg_t> not_ready_to_merge_source;
+  std::map<pg_t,pg_t> not_ready_to_merge_target;
+  std::set<pg_t> sent_ready_to_merge_source;
+
+  void set_ready_to_merge_source(PG *pg,
+				 eversion_t version);
+  void set_ready_to_merge_target(PG *pg,
+				 eversion_t version,
+				 epoch_t last_epoch_started,
+				 epoch_t last_epoch_clean);
+  void set_not_ready_to_merge_source(pg_t source);
+  void set_not_ready_to_merge_target(pg_t target, pg_t source);
+  void clear_ready_to_merge(PG *pg);
+  void send_ready_to_merge();
+  void _send_ready_to_merge();
+  void clear_sent_ready_to_merge();
+  void prune_sent_ready_to_merge(const OSDMapRef& osdmap);
+
+  // -- pg_temp --
+private:
+  ceph::mutex pg_temp_lock = ceph::make_mutex("OSDService::pg_temp_lock");
+  struct pg_temp_t {
+    std::vector<int> acting;
+    bool forced = false;
+  };
+  std::map<pg_t, pg_temp_t> pg_temp_wanted;
+  std::map<pg_t, pg_temp_t> pg_temp_pending;
+  void _sent_pg_temp();
+  friend std::ostream& operator<<(std::ostream&, const pg_temp_t&);
+public:
+  void queue_want_pg_temp(pg_t pgid, const std::vector<int>& want,
+			  bool forced = false);
+  void remove_want_pg_temp(pg_t pgid);
+  void requeue_pg_temp();
+  void send_pg_temp();
+
+  ceph::mutex pg_created_lock = ceph::make_mutex("OSDService::pg_created_lock");
+  std::set<pg_t> pg_created;
+  void send_pg_created(pg_t pgid);
+  void prune_pg_created();
+  void send_pg_created();
+
+  AsyncReserver<spg_t, Finisher> snap_reserver;
+  void queue_recovery_context(PG *pg, GenContext<ThreadPool::TPHandle&> *c);
+  void queue_for_snap_trim(PG *pg);
+  void queue_for_scrub(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  void queue_scrub_after_repair(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// queue the message (-> event) that all replicas have reserved scrub resources for us
+  void queue_for_scrub_granted(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// queue the message (-> event) that some replicas denied our scrub resources request
+  void queue_for_scrub_denied(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals either (a) the end of a sleep period, or (b) a recheck of the availability
+  /// of the primary map being created by the backend.
+  void queue_for_scrub_resched(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals a change in the number of in-flight recovery writes
+  void queue_scrub_pushes_update(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that all pending updates were applied
+  void queue_scrub_applied_update(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that the selected chunk (objects range) is available for scrubbing
+  void queue_scrub_chunk_free(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// The chunk selected is blocked by user operations, and cannot be scrubbed now
+  void queue_scrub_chunk_busy(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// The block-range that was locked and prevented the scrubbing - is freed
+  void queue_scrub_unblocking(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that all write OPs are done
+  void queue_scrub_digest_update(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that the the local (Primary's) scrub map is ready
+  void queue_scrub_got_local_map(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that we (the Primary) got all waited-for scrub-maps from our replicas
+  void queue_scrub_got_repl_maps(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that all chunks were handled
+  /// Note: always with high priority, as must be acted upon before the
+  /// next scrub request arrives from the Primary (and the primary is free
+  /// to send the request once the replica's map is received).
+  void queue_scrub_is_finished(PG* pg);
+
+  /// Signals that there are more chunks to handle
+  void queue_scrub_next_chunk(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  /// Signals that we have finished comparing the maps for this chunk
+  /// Note: required, as in Crimson this operation is 'futurized'.
+  void queue_scrub_maps_compared(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  void queue_for_rep_scrub(PG* pg,
+			   Scrub::scrub_prio_t with_high_priority,
+			   unsigned int qu_priority,
+			   Scrub::act_token_t act_token);
+
+  /// Signals a change in the number of in-flight recovery writes
+  void queue_scrub_replica_pushes(PG *pg, Scrub::scrub_prio_t with_priority);
+
+  /// (not in Crimson) Queue a SchedReplica event to be sent to the replica, to
+  /// trigger a re-check of the availability of the scrub map prepared by the
+  /// backend.
+  void queue_for_rep_scrub_resched(PG* pg,
+				   Scrub::scrub_prio_t with_high_priority,
+				   unsigned int qu_priority,
+				   Scrub::act_token_t act_token);
+
+  void queue_for_pg_delete(spg_t pgid, epoch_t e);
+  bool try_finish_pg_delete(PG *pg, unsigned old_pg_num);
+
+private:
+  // -- pg recovery and associated throttling --
+  ceph::mutex recovery_lock = ceph::make_mutex("OSDService::recovery_lock");
+  std::list<std::pair<epoch_t, PGRef> > awaiting_throttle;
+
+  /// queue a scrub-related message for a PG
+  template <class MSG_TYPE>
+  void queue_scrub_event_msg(PG* pg,
+			     Scrub::scrub_prio_t with_priority,
+			     unsigned int qu_priority,
+			     Scrub::act_token_t act_token);
+
+  /// An alternative version of queue_scrub_event_msg(), in which the queuing priority is
+  /// provided by the executing scrub (i.e. taken from PgScrubber::m_flags)
+  template <class MSG_TYPE>
+  void queue_scrub_event_msg(PG* pg, Scrub::scrub_prio_t with_priority);
+
+  utime_t defer_recovery_until;
+  uint64_t recovery_ops_active;
+  uint64_t recovery_ops_reserved;
+  bool recovery_paused;
+#ifdef DEBUG_RECOVERY_OIDS
+  std::map<spg_t, std::set<hobject_t> > recovery_oids;
+#endif
+  bool _recover_now(uint64_t *available_pushes);
+  void _maybe_queue_recovery();
+  void _queue_for_recovery(
+    std::pair<epoch_t, PGRef> p, uint64_t reserved_pushes);
+public:
+  void start_recovery_op(PG *pg, const hobject_t& soid);
+  void finish_recovery_op(PG *pg, const hobject_t& soid, bool dequeue);
+  bool is_recovery_active();
+  void release_reserved_pushes(uint64_t pushes);
+  void defer_recovery(float defer_for) {
+    defer_recovery_until = ceph_clock_now();
+    defer_recovery_until += defer_for;
+  }
+  void pause_recovery() {
+    std::lock_guard l(recovery_lock);
+    recovery_paused = true;
+  }
+  bool recovery_is_paused() {
+    std::lock_guard l(recovery_lock);
+    return recovery_paused;
+  }
+  void unpause_recovery() {
+    std::lock_guard l(recovery_lock);
+    recovery_paused = false;
+    _maybe_queue_recovery();
+  }
+  void kick_recovery_queue() {
+    std::lock_guard l(recovery_lock);
+    _maybe_queue_recovery();
+  }
+  void clear_queued_recovery(PG *pg) {
+    std::lock_guard l(recovery_lock);
+    awaiting_throttle.remove_if(
+      [pg](decltype(awaiting_throttle)::const_reference awaiting ) {
+	return awaiting.second.get() == pg;
+      });
+  }
+
+  unsigned get_target_pg_log_entries() const;
+
+  // delayed pg activation
+  void queue_for_recovery(PG *pg) {
+    std::lock_guard l(recovery_lock);
+
+    if (pg->is_forced_recovery_or_backfill()) {
+      awaiting_throttle.push_front(std::make_pair(pg->get_osdmap()->get_epoch(), pg));
+    } else {
+      awaiting_throttle.push_back(std::make_pair(pg->get_osdmap()->get_epoch(), pg));
+    }
+    _maybe_queue_recovery();
+  }
+  void queue_recovery_after_sleep(PG *pg, epoch_t queued, uint64_t reserved_pushes) {
+    std::lock_guard l(recovery_lock);
+    _queue_for_recovery(std::make_pair(queued, pg), reserved_pushes);
+  }
+
+  void queue_check_readable(spg_t spgid,
+			    epoch_t lpr,
+			    ceph::signedspan delay = ceph::signedspan::zero());
+
+  // osd map cache (past osd maps)
+  ceph::mutex map_cache_lock = ceph::make_mutex("OSDService::map_cache_lock");
+  SharedLRU<epoch_t, const OSDMap> map_cache;
+  SimpleLRU<epoch_t, ceph::buffer::list> map_bl_cache;
+  SimpleLRU<epoch_t, ceph::buffer::list> map_bl_inc_cache;
+
+  OSDMapRef try_get_map(epoch_t e);
+  OSDMapRef get_map(epoch_t e) {
+    OSDMapRef ret(try_get_map(e));
+    ceph_assert(ret);
+    return ret;
+  }
+  OSDMapRef add_map(OSDMap *o) {
+    std::lock_guard l(map_cache_lock);
+    return _add_map(o);
+  }
+  OSDMapRef _add_map(OSDMap *o);
+
+  void _add_map_bl(epoch_t e, ceph::buffer::list& bl);
+  bool get_map_bl(epoch_t e, ceph::buffer::list& bl) {
+    std::lock_guard l(map_cache_lock);
+    return _get_map_bl(e, bl);
+  }
+  bool _get_map_bl(epoch_t e, ceph::buffer::list& bl);
+
+  void _add_map_inc_bl(epoch_t e, ceph::buffer::list& bl);
+  bool get_inc_map_bl(epoch_t e, ceph::buffer::list& bl);
+
+  /// identify split child pgids over a osdmap interval
+  void identify_splits_and_merges(
+    OSDMapRef old_map,
+    OSDMapRef new_map,
+    spg_t pgid,
+    std::set<std::pair<spg_t,epoch_t>> *new_children,
+    std::set<std::pair<spg_t,epoch_t>> *merge_pgs);
+
+  void need_heartbeat_peer_update();
+
+  void init();
+  void final_init();
+  void start_shutdown();
+  void shutdown_reserver();
+  void shutdown();
+
+  // -- stats --
+  ceph::mutex stat_lock = ceph::make_mutex("OSDService::stat_lock");
+  osd_stat_t osd_stat;
+  uint32_t seq = 0;
+
+  void set_statfs(const struct store_statfs_t &stbuf,
+    osd_alert_list_t& alerts);
+  osd_stat_t set_osd_stat(std::vector<int>& hb_peers, int num_pgs);
+  void inc_osd_stat_repaired(void);
+  float compute_adjusted_ratio(osd_stat_t new_stat, float *pratio, uint64_t adjust_used = 0);
+  osd_stat_t get_osd_stat() {
+    std::lock_guard l(stat_lock);
+    ++seq;
+    osd_stat.up_from = up_epoch;
+    osd_stat.seq = ((uint64_t)osd_stat.up_from << 32) + seq;
+    return osd_stat;
+  }
+  uint64_t get_osd_stat_seq() {
+    std::lock_guard l(stat_lock);
+    return osd_stat.seq;
+  }
+  void get_hb_pingtime(std::map<int, osd_stat_t::Interfaces> *pp)
+  {
+    std::lock_guard l(stat_lock);
+    *pp = osd_stat.hb_pingtime;
+    return;
+  }
+
+  // -- OSD Full Status --
+private:
+  friend TestOpsSocketHook;
+  mutable ceph::mutex full_status_lock = ceph::make_mutex("OSDService::full_status_lock");
+  enum s_names { INVALID = -1, NONE, NEARFULL, BACKFILLFULL, FULL, FAILSAFE } cur_state;  // ascending
+  const char *get_full_state_name(s_names s) const {
+    switch (s) {
+    case NONE: return "none";
+    case NEARFULL: return "nearfull";
+    case BACKFILLFULL: return "backfillfull";
+    case FULL: return "full";
+    case FAILSAFE: return "failsafe";
+    default: return "???";
+    }
+  }
+  s_names get_full_state(std::string type) const {
+    if (type == "none")
+      return NONE;
+    else if (type == "failsafe")
+      return FAILSAFE;
+    else if (type == "full")
+      return FULL;
+    else if (type == "backfillfull")
+      return BACKFILLFULL;
+    else if (type == "nearfull")
+      return NEARFULL;
+    else
+      return INVALID;
+  }
+  double cur_ratio, physical_ratio;  ///< current utilization
+  mutable int64_t injectfull = 0;
+  s_names injectfull_state = NONE;
+  float get_failsafe_full_ratio();
+  bool _check_inject_full(DoutPrefixProvider *dpp, s_names type) const;
+  bool _check_full(DoutPrefixProvider *dpp, s_names type) const;
+public:
+  void check_full_status(float ratio, float pratio);
+  s_names recalc_full_state(float ratio, float pratio, std::string &inject);
+  bool _tentative_full(DoutPrefixProvider *dpp, s_names type, uint64_t adjust_used, osd_stat_t);
+  bool check_failsafe_full(DoutPrefixProvider *dpp) const;
+  bool check_full(DoutPrefixProvider *dpp) const;
+  bool tentative_backfill_full(DoutPrefixProvider *dpp, uint64_t adjust_used, osd_stat_t);
+  bool check_backfill_full(DoutPrefixProvider *dpp) const;
+  bool check_nearfull(DoutPrefixProvider *dpp) const;
+  bool is_failsafe_full() const;
+  bool is_full() const;
+  bool is_backfillfull() const;
+  bool is_nearfull() const;
+  bool need_fullness_update();  ///< osdmap state needs update
+  void set_injectfull(s_names type, int64_t count);
+
+
+  // -- epochs --
+private:
+  // protects access to boot_epoch, up_epoch, bind_epoch
+  mutable ceph::mutex epoch_lock = ceph::make_mutex("OSDService::epoch_lock");
+  epoch_t boot_epoch;  // _first_ epoch we were marked up (after this process started)
+  epoch_t up_epoch;    // _most_recent_ epoch we were marked up
+  epoch_t bind_epoch;  // epoch we last did a bind to new ip:ports
+public:
+  /**
+   * Retrieve the boot_, up_, and bind_ epochs the OSD has std::set. The params
+   * can be NULL if you don't care about them.
+   */
+  void retrieve_epochs(epoch_t *_boot_epoch, epoch_t *_up_epoch,
+                       epoch_t *_bind_epoch) const;
+  /**
+   * Std::set the boot, up, and bind epochs. Any NULL params will not be std::set.
+   */
+  void set_epochs(const epoch_t *_boot_epoch, const epoch_t *_up_epoch,
+                  const epoch_t *_bind_epoch);
+  epoch_t get_boot_epoch() const {
+    epoch_t ret;
+    retrieve_epochs(&ret, NULL, NULL);
+    return ret;
+  }
+  epoch_t get_up_epoch() const {
+    epoch_t ret;
+    retrieve_epochs(NULL, &ret, NULL);
+    return ret;
+  }
+  epoch_t get_bind_epoch() const {
+    epoch_t ret;
+    retrieve_epochs(NULL, NULL, &ret);
+    return ret;
+  }
+
+  void request_osdmap_update(epoch_t e);
+
+  // -- heartbeats --
+  ceph::mutex hb_stamp_lock = ceph::make_mutex("OSDServce::hb_stamp_lock");
+
+  /// osd -> heartbeat stamps
+  std::vector<HeartbeatStampsRef> hb_stamps;
+
+  /// get or create a ref for a peer's HeartbeatStamps
+  HeartbeatStampsRef get_hb_stamps(unsigned osd);
+
+
+  // Timer for readable leases
+  ceph::timer<ceph::mono_clock> mono_timer = ceph::timer<ceph::mono_clock>{ceph::construct_suspended};
+
+  void queue_renew_lease(epoch_t epoch, spg_t spgid);
+
+  // -- stopping --
+  ceph::mutex is_stopping_lock = ceph::make_mutex("OSDService::is_stopping_lock");
+  ceph::condition_variable is_stopping_cond;
+  enum {
+    NOT_STOPPING,
+    PREPARING_TO_STOP,
+    STOPPING };
+  std::atomic<int> state{NOT_STOPPING};
+  int get_state() const {
+    return state;
+  }
+  void set_state(int s) {
+    state = s;
+  }
+  bool is_stopping() const {
+    return state == STOPPING;
+  }
+  bool is_preparing_to_stop() const {
+    return state == PREPARING_TO_STOP;
+  }
+  bool prepare_to_stop();
+  void got_stop_ack();
+
+
+#ifdef PG_DEBUG_REFS
+  ceph::mutex pgid_lock = ceph::make_mutex("OSDService::pgid_lock");
+  std::map<spg_t, int> pgid_tracker;
+  std::map<spg_t, PG*> live_pgs;
+  void add_pgid(spg_t pgid, PG *pg);
+  void remove_pgid(spg_t pgid, PG *pg);
+  void dump_live_pgids();
+#endif
+
+  explicit OSDService(OSD *osd, ceph::async::io_context_pool& poolctx);
+  ~OSDService() = default;
+};
+
+/*
+
+  Each PG slot includes queues for events that are processing and/or waiting
+  for a PG to be materialized in the slot.
+
+  These are the constraints:
+
+  - client ops must remained ordered by client, regardless of std::map epoch
+  - peering messages/events from peers must remain ordered by peer
+  - peering messages and client ops need not be ordered relative to each other
+
+  - some peering events can create a pg (e.g., notify)
+  - the query peering event can proceed when a PG doesn't exist
+
+  Implementation notes:
+
+  - everybody waits for split.  If the OSD has the parent PG it will instantiate
+    the PGSlot early and mark it waiting_for_split.  Everything will wait until
+    the parent is able to commit the split operation and the child PG's are
+    materialized in the child slots.
+
+  - every event has an epoch property and will wait for the OSDShard to catch
+    up to that epoch.  For example, if we get a peering event from a future
+    epoch, the event will wait in the slot until the local OSD has caught up.
+    (We should be judicious in specifying the required epoch [by, e.g., setting
+    it to the same_interval_since epoch] so that we don't wait for epochs that
+    don't affect the given PG.)
+
+  - we maintain two separate wait lists, *waiting* and *waiting_peering*. The
+    OpSchedulerItem has an is_peering() bool to determine which we use.  Waiting
+    peering events are queued up by epoch required.
+
+  - when we wake a PG slot (e.g., we finished split, or got a newer osdmap, or
+    materialized the PG), we wake *all* waiting items.  (This could be optimized,
+    probably, but we don't bother.)  We always requeue peering items ahead of
+    client ops.
+
+  - some peering events are marked !peering_requires_pg (PGQuery).  if we do
+    not have a PG these are processed immediately (under the shard lock).
+
+  - we do not have a PG present, we check if the slot maps to the current host.
+    if so, we either queue the item and wait for the PG to materialize, or
+    (if the event is a pg creating event like PGNotify), we materialize the PG.
+
+  - when we advance the osdmap on the OSDShard, we scan pg slots and
+    discard any slots with no pg (and not waiting_for_split) that no
+    longer std::map to the current host.
+
+  */
+
+struct OSDShardPGSlot {
+  using OpSchedulerItem = ceph::osd::scheduler::OpSchedulerItem;
+  PGRef pg;                      ///< pg reference
+  std::deque<OpSchedulerItem> to_process; ///< order items for this slot
+  int num_running = 0;          ///< _process threads doing pg lookup/lock
+
+  std::deque<OpSchedulerItem> waiting;   ///< waiting for pg (or map + pg)
+
+  /// waiting for map (peering evt)
+  std::map<epoch_t,std::deque<OpSchedulerItem>> waiting_peering;
+
+  /// incremented by wake_pg_waiters; indicates racing _process threads
+  /// should bail out (their op has been requeued)
+  uint64_t requeue_seq = 0;
+
+  /// waiting for split child to materialize in these epoch(s)
+  std::set<epoch_t> waiting_for_split;
+
+  epoch_t epoch = 0;
+  boost::intrusive::set_member_hook<> pg_epoch_item;
+
+  /// waiting for a merge (source or target) by this epoch
+  epoch_t waiting_for_merge_epoch = 0;
+};
+
+struct OSDShard {
+  const unsigned shard_id;
+  CephContext *cct;
+  OSD *osd;
+
+  std::string shard_name;
+
+  std::string sdata_wait_lock_name;
+  ceph::mutex sdata_wait_lock;
+  ceph::condition_variable sdata_cond;
+  int waiting_threads = 0;
+
+  ceph::mutex osdmap_lock;  ///< protect shard_osdmap updates vs users w/o shard_lock
+  OSDMapRef shard_osdmap;
+
+  OSDMapRef get_osdmap() {
+    std::lock_guard l(osdmap_lock);
+    return shard_osdmap;
+  }
+
+  std::string shard_lock_name;
+  ceph::mutex shard_lock;   ///< protects remaining members below
+
+  /// map of slots for each spg_t.  maintains ordering of items dequeued
+  /// from scheduler while _process thread drops shard lock to acquire the
+  /// pg lock.  stale slots are removed by consume_map.
+  std::unordered_map<spg_t,std::unique_ptr<OSDShardPGSlot>> pg_slots;
+
+  struct pg_slot_compare_by_epoch {
+    bool operator()(const OSDShardPGSlot& l, const OSDShardPGSlot& r) const {
+      return l.epoch < r.epoch;
+    }
+  };
+
+  /// maintain an ordering of pg slots by pg epoch
+  boost::intrusive::multiset<
+    OSDShardPGSlot,
+    boost::intrusive::member_hook<
+      OSDShardPGSlot,
+      boost::intrusive::set_member_hook<>,
+      &OSDShardPGSlot::pg_epoch_item>,
+    boost::intrusive::compare<pg_slot_compare_by_epoch>> pg_slots_by_epoch;
+  int waiting_for_min_pg_epoch = 0;
+  ceph::condition_variable min_pg_epoch_cond;
+
+  /// priority queue
+  ceph::osd::scheduler::OpSchedulerRef scheduler;
+
+  bool stop_waiting = false;
+
+  ContextQueue context_queue;
+
+  void _attach_pg(OSDShardPGSlot *slot, PG *pg);
+  void _detach_pg(OSDShardPGSlot *slot);
+
+  void update_pg_epoch(OSDShardPGSlot *slot, epoch_t epoch);
+  epoch_t get_min_pg_epoch();
+  void wait_min_pg_epoch(epoch_t need);
+
+  /// return newest epoch we are waiting for
+  epoch_t get_max_waiting_epoch();
+
+  /// push osdmap into shard
+  void consume_map(
+    const OSDMapRef& osdmap,
+    unsigned *pushes_to_free);
+
+  void _wake_pg_slot(spg_t pgid, OSDShardPGSlot *slot);
+
+  void identify_splits_and_merges(
+    const OSDMapRef& as_of_osdmap,
+    std::set<std::pair<spg_t,epoch_t>> *split_children,
+    std::set<std::pair<spg_t,epoch_t>> *merge_pgs);
+  void _prime_splits(std::set<std::pair<spg_t,epoch_t>> *pgids);
+  void prime_splits(const OSDMapRef& as_of_osdmap,
+		    std::set<std::pair<spg_t,epoch_t>> *pgids);
+  void prime_merges(const OSDMapRef& as_of_osdmap,
+		    std::set<std::pair<spg_t,epoch_t>> *merge_pgs);
+  void register_and_wake_split_child(PG *pg);
+  void unprime_split_children(spg_t parent, unsigned old_pg_num);
+  void update_scheduler_config();
+
+  OSDShard(
+    int id,
+    CephContext *cct,
+    OSD *osd);
+};
+
+class OSD : public Dispatcher,
+	    public md_config_obs_t {
+  using OpSchedulerItem = ceph::osd::scheduler::OpSchedulerItem;
+
+  /** OSD **/
+  // global lock
+  ceph::mutex osd_lock = ceph::make_mutex("OSD::osd_lock");
+  SafeTimer tick_timer;    // safe timer (osd_lock)
+
+  // Tick timer for those stuff that do not need osd_lock
+  ceph::mutex tick_timer_lock = ceph::make_mutex("OSD::tick_timer_lock");
+  SafeTimer tick_timer_without_osd_lock;
+  std::string gss_ktfile_client{};
+
+public:
+  // config observer bits
+  const char** get_tracked_conf_keys() const override;
+  void handle_conf_change(const ConfigProxy& conf,
+                          const std::set <std::string> &changed) override;
+  void update_log_config();
+  void check_config();
+
+protected:
+
+  const double OSD_TICK_INTERVAL = { 1.0 };
+  double get_tick_interval() const;
+
+  Messenger   *cluster_messenger;
+  Messenger   *client_messenger;
+  Messenger   *objecter_messenger;
+  MonClient   *monc; // check the "monc helpers" list before accessing directly
+  MgrClient   mgrc;
+  PerfCounters      *logger;
+  PerfCounters      *recoverystate_perf;
+  ObjectStore *store;
+#ifdef HAVE_LIBFUSE
+  FuseStore *fuse_store = nullptr;
+#endif
+  LogClient log_client;
+  LogChannelRef clog;
+
+  int whoami;
+  std::string dev_path, journal_path;
+
+  ceph_release_t last_require_osd_release{ceph_release_t::unknown};
+
+  int numa_node = -1;
+  size_t numa_cpu_set_size = 0;
+  cpu_set_t numa_cpu_set;
+
+  bool store_is_rotational = true;
+  bool journal_is_rotational = true;
+
+  ZTracer::Endpoint trace_endpoint;
+  PerfCounters* create_logger();
+  PerfCounters* create_recoverystate_perf();
+  void tick();
+  void tick_without_osd_lock();
+  void _dispatch(Message *m);
+  void dispatch_op(OpRequestRef op);
+
+  void check_osdmap_features();
+
+  // asok
+  friend class OSDSocketHook;
+  class OSDSocketHook *asok_hook;
+  void asok_command(
+    std::string_view prefix,
+    const cmdmap_t& cmdmap,
+    ceph::Formatter *f,
+    const ceph::buffer::list& inbl,
+    std::function<void(int,const std::string&,ceph::buffer::list&)> on_finish);
+
+public:
+  int get_nodeid() { return whoami; }
+
+  static ghobject_t get_osdmap_pobject_name(epoch_t epoch) {
+    char foo[20];
+    snprintf(foo, sizeof(foo), "osdmap.%d", epoch);
+    return ghobject_t(hobject_t(sobject_t(object_t(foo), 0)));
+  }
+  static ghobject_t get_inc_osdmap_pobject_name(epoch_t epoch) {
+    char foo[22];
+    snprintf(foo, sizeof(foo), "inc_osdmap.%d", epoch);
+    return ghobject_t(hobject_t(sobject_t(object_t(foo), 0)));
+  }
+
+  static ghobject_t make_snapmapper_oid() {
+    return ghobject_t(hobject_t(
+      sobject_t(
+	object_t("snapmapper"),
+	0)));
+  }
+  static ghobject_t make_purged_snaps_oid() {
+    return ghobject_t(hobject_t(
+      sobject_t(
+	object_t("purged_snaps"),
+	0)));
+  }
+
+  static ghobject_t make_pg_log_oid(spg_t pg) {
+    std::stringstream ss;
+    ss << "pglog_" << pg;
+    std::string s;
+    getline(ss, s);
+    return ghobject_t(hobject_t(sobject_t(object_t(s.c_str()), 0)));
+  }
+
+  static ghobject_t make_pg_biginfo_oid(spg_t pg) {
+    std::stringstream ss;
+    ss << "pginfo_" << pg;
+    std::string s;
+    getline(ss, s);
+    return ghobject_t(hobject_t(sobject_t(object_t(s.c_str()), 0)));
+  }
+  static ghobject_t make_infos_oid() {
+    hobject_t oid(sobject_t("infos", CEPH_NOSNAP));
+    return ghobject_t(oid);
+  }
+
+  static ghobject_t make_final_pool_info_oid(int64_t pool) {
+    return ghobject_t(
+      hobject_t(
+	sobject_t(
+	  object_t(std::string("final_pool_") + stringify(pool)),
+	  CEPH_NOSNAP)));
+  }
+
+  static ghobject_t make_pg_num_history_oid() {
+    return ghobject_t(hobject_t(sobject_t("pg_num_history", CEPH_NOSNAP)));
+  }
+
+  static void recursive_remove_collection(CephContext* cct,
+					  ObjectStore *store,
+					  spg_t pgid,
+					  coll_t tmp);
+
+  /**
+   * get_osd_initial_compat_set()
+   *
+   * Get the initial feature std::set for this OSD.  Features
+   * here are automatically upgraded.
+   *
+   * Return value: Initial osd CompatSet
+   */
+  static CompatSet get_osd_initial_compat_set();
+
+  /**
+   * get_osd_compat_set()
+   *
+   * Get all features supported by this OSD
+   *
+   * Return value: CompatSet of all supported features
+   */
+  static CompatSet get_osd_compat_set();
+
+
+private:
+  class C_Tick;
+  class C_Tick_WithoutOSDLock;
+
+  // -- config settings --
+  float m_osd_pg_epoch_max_lag_factor;
+
+  // -- superblock --
+  OSDSuperblock superblock;
+
+  void write_superblock();
+  void write_superblock(ObjectStore::Transaction& t);
+  int read_superblock();
+
+  void clear_temp_objects();
+
+  CompatSet osd_compat;
+
+  // -- state --
+public:
+  typedef enum {
+    STATE_INITIALIZING = 1,
+    STATE_PREBOOT,
+    STATE_BOOTING,
+    STATE_ACTIVE,
+    STATE_STOPPING,
+    STATE_WAITING_FOR_HEALTHY
+  } osd_state_t;
+
+  static const char *get_state_name(int s) {
+    switch (s) {
+    case STATE_INITIALIZING: return "initializing";
+    case STATE_PREBOOT: return "preboot";
+    case STATE_BOOTING: return "booting";
+    case STATE_ACTIVE: return "active";
+    case STATE_STOPPING: return "stopping";
+    case STATE_WAITING_FOR_HEALTHY: return "waiting_for_healthy";
+    default: return "???";
+    }
+  }
+
+private:
+  std::atomic<int> state{STATE_INITIALIZING};
+
+public:
+  int get_state() const {
+    return state;
+  }
+  void set_state(int s) {
+    state = s;
+  }
+  bool is_initializing() const {
+    return state == STATE_INITIALIZING;
+  }
+  bool is_preboot() const {
+    return state == STATE_PREBOOT;
+  }
+  bool is_booting() const {
+    return state == STATE_BOOTING;
+  }
+  bool is_active() const {
+    return state == STATE_ACTIVE;
+  }
+  bool is_stopping() const {
+    return state == STATE_STOPPING;
+  }
+  bool is_waiting_for_healthy() const {
+    return state == STATE_WAITING_FOR_HEALTHY;
+  }
+
+private:
+
+  ShardedThreadPool osd_op_tp;
+
+  void get_latest_osdmap();
+
+  // -- sessions --
+private:
+  void dispatch_session_waiting(const ceph::ref_t<Session>& session, OSDMapRef osdmap);
+
+  ceph::mutex session_waiting_lock = ceph::make_mutex("OSD::session_waiting_lock");
+  std::set<ceph::ref_t<Session>> session_waiting_for_map;
+
+  /// Caller assumes refs for included Sessions
+  void get_sessions_waiting_for_map(std::set<ceph::ref_t<Session>> *out) {
+    std::lock_guard l(session_waiting_lock);
+    out->swap(session_waiting_for_map);
+  }
+  void register_session_waiting_on_map(const ceph::ref_t<Session>& session) {
+    std::lock_guard l(session_waiting_lock);
+    session_waiting_for_map.insert(session);
+  }
+  void clear_session_waiting_on_map(const ceph::ref_t<Session>& session) {
+    std::lock_guard l(session_waiting_lock);
+    session_waiting_for_map.erase(session);
+  }
+  void dispatch_sessions_waiting_on_map() {
+    std::set<ceph::ref_t<Session>> sessions_to_check;
+    get_sessions_waiting_for_map(&sessions_to_check);
+    for (auto i = sessions_to_check.begin();
+	 i != sessions_to_check.end();
+	 sessions_to_check.erase(i++)) {
+      std::lock_guard l{(*i)->session_dispatch_lock};
+      dispatch_session_waiting(*i, get_osdmap());
+    }
+  }
+  void session_handle_reset(const ceph::ref_t<Session>& session) {
+    std::lock_guard l(session->session_dispatch_lock);
+    clear_session_waiting_on_map(session);
+
+    session->clear_backoffs();
+
+    /* Messages have connection refs, we need to clear the
+     * connection->session->message->connection
+     * cycles which result.
+     * Bug #12338
+     */
+    session->waiting_on_map.clear_and_dispose(TrackedOp::Putter());
+  }
+
+private:
+  /**
+   * @defgroup monc helpers
+   * @{
+   * Right now we only have the one
+   */
+
+  /**
+   * Ask the Monitors for a sequence of OSDMaps.
+   *
+   * @param epoch The epoch to start with when replying
+   * @param force_request True if this request forces a new subscription to
+   * the monitors; false if an outstanding request that encompasses it is
+   * sufficient.
+   */
+  void osdmap_subscribe(version_t epoch, bool force_request);
+  /** @} monc helpers */
+
+  ceph::mutex osdmap_subscribe_lock = ceph::make_mutex("OSD::osdmap_subscribe_lock");
+  epoch_t latest_subscribed_epoch{0};
+
+  // -- heartbeat --
+  /// information about a heartbeat peer
+  struct HeartbeatInfo {
+    int peer;           ///< peer
+    ConnectionRef con_front;   ///< peer connection (front)
+    ConnectionRef con_back;    ///< peer connection (back)
+    utime_t first_tx;   ///< time we sent our first ping request
+    utime_t last_tx;    ///< last time we sent a ping request
+    utime_t last_rx_front;  ///< last time we got a ping reply on the front side
+    utime_t last_rx_back;   ///< last time we got a ping reply on the back side
+    epoch_t epoch;      ///< most recent epoch we wanted this peer
+    /// number of connections we send and receive heartbeat pings/replies
+    static constexpr int HEARTBEAT_MAX_CONN = 2;
+    /// history of inflight pings, arranging by timestamp we sent
+    /// send time -> deadline -> remaining replies
+    std::map<utime_t, std::pair<utime_t, int>> ping_history;
+
+    utime_t hb_interval_start;
+    uint32_t hb_average_count = 0;
+    uint32_t hb_index = 0;
+
+    uint32_t hb_total_back = 0;
+    uint32_t hb_min_back = UINT_MAX;
+    uint32_t hb_max_back = 0;
+    std::vector<uint32_t> hb_back_pingtime;
+    std::vector<uint32_t> hb_back_min;
+    std::vector<uint32_t> hb_back_max;
+
+    uint32_t hb_total_front = 0;
+    uint32_t hb_min_front = UINT_MAX;
+    uint32_t hb_max_front = 0;
+    std::vector<uint32_t> hb_front_pingtime;
+    std::vector<uint32_t> hb_front_min;
+    std::vector<uint32_t> hb_front_max;
+
+    bool is_stale(utime_t stale) const {
+      if (ping_history.empty()) {
+        return false;
+      }
+      utime_t oldest_deadline = ping_history.begin()->second.first;
+      return oldest_deadline <= stale;
+    }
+
+    bool is_unhealthy(utime_t now) const {
+      if (ping_history.empty()) {
+        /// we haven't sent a ping yet or we have got all replies,
+        /// in either way we are safe and healthy for now
+        return false;
+      }
+
+      utime_t oldest_deadline = ping_history.begin()->second.first;
+      return now > oldest_deadline;
+    }
+
+    bool is_healthy(utime_t now) const {
+      if (last_rx_front == utime_t() || last_rx_back == utime_t()) {
+        // only declare to be healthy until we have received the first
+        // replies from both front/back connections
+        return false;
+      }
+      return !is_unhealthy(now);
+    }
+
+    void clear_mark_down(Connection *except = nullptr) {
+      if (con_back && con_back != except) {
+	con_back->mark_down();
+	con_back->clear_priv();
+	con_back.reset(nullptr);
+      }
+      if (con_front && con_front != except) {
+	con_front->mark_down();
+	con_front->clear_priv();
+	con_front.reset(nullptr);
+      }
+    }
+  };
+
+  ceph::mutex heartbeat_lock = ceph::make_mutex("OSD::heartbeat_lock");
+  std::map<int, int> debug_heartbeat_drops_remaining;
+  ceph::condition_variable heartbeat_cond;
+  bool heartbeat_stop;
+  std::atomic<bool> heartbeat_need_update;
+  std::map<int,HeartbeatInfo> heartbeat_peers;  ///< map of osd id to HeartbeatInfo
+  utime_t last_mon_heartbeat;
+  Messenger *hb_front_client_messenger;
+  Messenger *hb_back_client_messenger;
+  Messenger *hb_front_server_messenger;
+  Messenger *hb_back_server_messenger;
+  utime_t last_heartbeat_resample;   ///< last time we chose random peers in waiting-for-healthy state
+  double daily_loadavg;
+  ceph::mono_time startup_time;
+
+  // Track ping repsonse times using vector as a circular buffer
+  // MUST BE A POWER OF 2
+  const uint32_t hb_vector_size = 16;
+
+  void _add_heartbeat_peer(int p);
+  void _remove_heartbeat_peer(int p);
+  bool heartbeat_reset(Connection *con);
+  void maybe_update_heartbeat_peers();
+  void reset_heartbeat_peers(bool all);
+  bool heartbeat_peers_need_update() {
+    return heartbeat_need_update.load();
+  }
+  void heartbeat_set_peers_need_update() {
+    heartbeat_need_update.store(true);
+  }
+  void heartbeat_clear_peers_need_update() {
+    heartbeat_need_update.store(false);
+  }
+  void heartbeat();
+  void heartbeat_check();
+  void heartbeat_entry();
+  void need_heartbeat_peer_update();
+
+  void heartbeat_kick() {
+    std::lock_guard l(heartbeat_lock);
+    heartbeat_cond.notify_all();
+  }
+
+  struct T_Heartbeat : public Thread {
+    OSD *osd;
+    explicit T_Heartbeat(OSD *o) : osd(o) {}
+    void *entry() override {
+      osd->heartbeat_entry();
+      return 0;
+    }
+  } heartbeat_thread;
+
+public:
+  bool heartbeat_dispatch(Message *m);
+
+  struct HeartbeatDispatcher : public Dispatcher {
+    OSD *osd;
+    explicit HeartbeatDispatcher(OSD *o) : Dispatcher(o->cct), osd(o) {}
+
+    bool ms_can_fast_dispatch_any() const override { return true; }
+    bool ms_can_fast_dispatch(const Message *m) const override {
+      switch (m->get_type()) {
+      case CEPH_MSG_PING:
+      case MSG_OSD_PING:
+	return true;
+      default:
+	return false;
+      }
+    }
+    void ms_fast_dispatch(Message *m) override {
+      osd->heartbeat_dispatch(m);
+    }
+    bool ms_dispatch(Message *m) override {
+      return osd->heartbeat_dispatch(m);
+    }
+    bool ms_handle_reset(Connection *con) override {
+      return osd->heartbeat_reset(con);
+    }
+    void ms_handle_remote_reset(Connection *con) override {}
+    bool ms_handle_refused(Connection *con) override {
+      return osd->ms_handle_refused(con);
+    }
+    int ms_handle_authentication(Connection *con) override {
+      return true;
+    }
+  } heartbeat_dispatcher;
+
+private:
+  // -- waiters --
+  std::list<OpRequestRef> finished;
+
+  void take_waiters(std::list<OpRequestRef>& ls) {
+    ceph_assert(ceph_mutex_is_locked(osd_lock));
+    finished.splice(finished.end(), ls);
+  }
+  void do_waiters();
+
+  // -- op tracking --
+  OpTracker op_tracker;
+  void test_ops(std::string command, std::string args, std::ostream& ss);
+  friend class TestOpsSocketHook;
+  TestOpsSocketHook *test_ops_hook;
+  friend struct C_FinishSplits;
+  friend struct C_OpenPGs;
+
+protected:
+
+  /*
+   * The ordered op delivery chain is:
+   *
+   *   fast dispatch -> scheduler back
+   *                    scheduler front <-> to_process back
+   *                                     to_process front  -> RunVis(item)
+   *                                                      <- queue_front()
+   *
+   * The scheduler is per-shard, and to_process is per pg_slot.  Items can be
+   * pushed back up into to_process and/or scheduler while order is preserved.
+   *
+   * Multiple worker threads can operate on each shard.
+   *
+   * Under normal circumstances, num_running == to_process.size().  There are
+   * two times when that is not true: (1) when waiting_for_pg == true and
+   * to_process is accumulating requests that are waiting for the pg to be
+   * instantiated; in that case they will all get requeued together by
+   * wake_pg_waiters, and (2) when wake_pg_waiters just ran, waiting_for_pg
+   * and already requeued the items.
+   */
+  friend class ceph::osd::scheduler::PGOpItem;
+  friend class ceph::osd::scheduler::PGPeeringItem;
+  friend class ceph::osd::scheduler::PGRecovery;
+  friend class ceph::osd::scheduler::PGRecoveryMsg;
+  friend class ceph::osd::scheduler::PGDelete;
+
+  class ShardedOpWQ
+    : public ShardedThreadPool::ShardedWQ<OpSchedulerItem>
+  {
+    OSD *osd;
+
+  public:
+    ShardedOpWQ(OSD *o,
+		ceph::timespan ti,
+		ceph::timespan si,
+		ShardedThreadPool* tp)
+      : ShardedThreadPool::ShardedWQ<OpSchedulerItem>(ti, si, tp),
+        osd(o) {
+    }
+
+    void _add_slot_waiter(
+      spg_t token,
+      OSDShardPGSlot *slot,
+      OpSchedulerItem&& qi);
+
+    /// try to do some work
+    void _process(uint32_t thread_index, ceph::heartbeat_handle_d *hb) override;
+
+    /// enqueue a new item
+    void _enqueue(OpSchedulerItem&& item) override;
+
+    /// requeue an old item (at the front of the line)
+    void _enqueue_front(OpSchedulerItem&& item) override;
+
+    void return_waiting_threads() override {
+      for(uint32_t i = 0; i < osd->num_shards; i++) {
+	OSDShard* sdata = osd->shards[i];
+	assert (NULL != sdata);
+	std::scoped_lock l{sdata->sdata_wait_lock};
+	sdata->stop_waiting = true;
+	sdata->sdata_cond.notify_all();
+      }
+    }
+
+    void stop_return_waiting_threads() override {
+      for(uint32_t i = 0; i < osd->num_shards; i++) {
+	OSDShard* sdata = osd->shards[i];
+	assert (NULL != sdata);
+	std::scoped_lock l{sdata->sdata_wait_lock};
+	sdata->stop_waiting = false;
+      }
+    }
+
+    void dump(ceph::Formatter *f) {
+      for(uint32_t i = 0; i < osd->num_shards; i++) {
+	auto &&sdata = osd->shards[i];
+
+	char queue_name[32] = {0};
+	snprintf(queue_name, sizeof(queue_name), "%s%" PRIu32, "OSD:ShardedOpWQ:", i);
+	ceph_assert(NULL != sdata);
+
+	std::scoped_lock l{sdata->shard_lock};
+	f->open_object_section(queue_name);
+	sdata->scheduler->dump(*f);
+	f->close_section();
+      }
+    }
+
+    bool is_shard_empty(uint32_t thread_index) override {
+      uint32_t shard_index = thread_index % osd->num_shards;
+      auto &&sdata = osd->shards[shard_index];
+      ceph_assert(sdata);
+      std::lock_guard l(sdata->shard_lock);
+      if (thread_index < osd->num_shards) {
+	return sdata->scheduler->empty() && sdata->context_queue.empty();
+      } else {
+	return sdata->scheduler->empty();
+      }
+    }
+
+    void handle_oncommits(std::list<Context*>& oncommits) {
+      for (auto p : oncommits) {
+	p->complete(0);
+      }
+    }
+  } op_shardedwq;
+
+
+  void enqueue_op(spg_t pg, OpRequestRef&& op, epoch_t epoch);
+  void dequeue_op(
+    PGRef pg, OpRequestRef op,
+    ThreadPool::TPHandle &handle);
+
+  void enqueue_peering_evt(
+    spg_t pgid,
+    PGPeeringEventRef ref);
+  void dequeue_peering_evt(
+    OSDShard *sdata,
+    PG *pg,
+    PGPeeringEventRef ref,
+    ThreadPool::TPHandle& handle);
+
+  void dequeue_delete(
+    OSDShard *sdata,
+    PG *pg,
+    epoch_t epoch,
+    ThreadPool::TPHandle& handle);
+
+  friend class PG;
+  friend struct OSDShard;
+  friend class PrimaryLogPG;
+  friend class PgScrubber;
+
+
+ protected:
+
+  // -- osd map --
+  // TODO: switch to std::atomic<OSDMapRef> when C++20 will be available.
+  OSDMapRef       _osdmap;
+  void set_osdmap(OSDMapRef osdmap) {
+    std::atomic_store(&_osdmap, osdmap);
+  }
+  OSDMapRef get_osdmap() const {
+    return std::atomic_load(&_osdmap);
+  }
+  epoch_t get_osdmap_epoch() const {
+    // XXX: performance?
+    auto osdmap = get_osdmap();
+    return osdmap ? osdmap->get_epoch() : 0;
+  }
+
+  pool_pg_num_history_t pg_num_history;
+
+  ceph::shared_mutex map_lock = ceph::make_shared_mutex("OSD::map_lock");
+  std::list<OpRequestRef>  waiting_for_osdmap;
+  std::deque<utime_t> osd_markdown_log;
+
+  friend struct send_map_on_destruct;
+
+  void wait_for_new_map(OpRequestRef op);
+  void handle_osd_map(class MOSDMap *m);
+  void _committed_osd_maps(epoch_t first, epoch_t last, class MOSDMap *m);
+  void trim_maps(epoch_t oldest, int nreceived, bool skip_maps);
+  void note_down_osd(int osd);
+  void note_up_osd(int osd);
+  friend struct C_OnMapCommit;
+
+  bool advance_pg(
+    epoch_t advance_to,
+    PG *pg,
+    ThreadPool::TPHandle &handle,
+    PeeringCtx &rctx);
+  void consume_map();
+  void activate_map();
+
+  // osd map cache (past osd maps)
+  OSDMapRef get_map(epoch_t e) {
+    return service.get_map(e);
+  }
+  OSDMapRef add_map(OSDMap *o) {
+    return service.add_map(o);
+  }
+  bool get_map_bl(epoch_t e, ceph::buffer::list& bl) {
+    return service.get_map_bl(e, bl);
+  }
+
+public:
+  // -- shards --
+  std::vector<OSDShard*> shards;
+  uint32_t num_shards = 0;
+
+  void inc_num_pgs() {
+    ++num_pgs;
+  }
+  void dec_num_pgs() {
+    --num_pgs;
+  }
+  int get_num_pgs() const {
+    return num_pgs;
+  }
+
+protected:
+  ceph::mutex merge_lock = ceph::make_mutex("OSD::merge_lock");
+  /// merge epoch -> target pgid -> source pgid -> pg
+  std::map<epoch_t,std::map<spg_t,std::map<spg_t,PGRef>>> merge_waiters;
+
+  bool add_merge_waiter(OSDMapRef nextmap, spg_t target, PGRef source,
+			unsigned need);
+
+  // -- placement groups --
+  std::atomic<size_t> num_pgs = {0};
+
+  std::mutex pending_creates_lock;
+  using create_from_osd_t = std::pair<spg_t, bool /* is primary*/>;
+  std::set<create_from_osd_t> pending_creates_from_osd;
+  unsigned pending_creates_from_mon = 0;
+
+  PGRecoveryStats pg_recovery_stats;
+
+  PGRef _lookup_pg(spg_t pgid);
+  PGRef _lookup_lock_pg(spg_t pgid);
+  void register_pg(PGRef pg);
+  bool try_finish_pg_delete(PG *pg, unsigned old_pg_num);
+
+  void _get_pgs(std::vector<PGRef> *v, bool clear_too=false);
+  void _get_pgids(std::vector<spg_t> *v);
+
+public:
+  PGRef lookup_lock_pg(spg_t pgid);
+
+  std::set<int64_t> get_mapped_pools();
+
+protected:
+  PG* _make_pg(OSDMapRef createmap, spg_t pgid);
+
+  bool maybe_wait_for_max_pg(const OSDMapRef& osdmap,
+			     spg_t pgid, bool is_mon_create);
+  void resume_creating_pg();
+
+  void load_pgs();
+
+  /// build initial pg history and intervals on create
+  void build_initial_pg_history(
+    spg_t pgid,
+    epoch_t created,
+    utime_t created_stamp,
+    pg_history_t *h,
+    PastIntervals *pi);
+
+  epoch_t last_pg_create_epoch;
+
+  void handle_pg_create(OpRequestRef op);
+
+  void split_pgs(
+    PG *parent,
+    const std::set<spg_t> &childpgids, std::set<PGRef> *out_pgs,
+    OSDMapRef curmap,
+    OSDMapRef nextmap,
+    PeeringCtx &rctx);
+  void _finish_splits(std::set<PGRef>& pgs);
+
+  // == monitor interaction ==
+  ceph::mutex mon_report_lock = ceph::make_mutex("OSD::mon_report_lock");
+  utime_t last_mon_report;
+  Finisher boot_finisher;
+
+  // -- boot --
+  void start_boot();
+  void _got_mon_epochs(epoch_t oldest, epoch_t newest);
+  void _preboot(epoch_t oldest, epoch_t newest);
+  void _send_boot();
+  void _collect_metadata(std::map<std::string,std::string> *pmeta);
+  void _get_purged_snaps();
+  void handle_get_purged_snaps_reply(MMonGetPurgedSnapsReply *r);
+
+  void start_waiting_for_healthy();
+  bool _is_healthy();
+
+  void send_full_update();
+
+  friend struct CB_OSD_GetVersion;
+
+  // -- alive --
+  epoch_t up_thru_wanted;
+
+  void queue_want_up_thru(epoch_t want);
+  void send_alive();
+
+  // -- full map requests --
+  epoch_t requested_full_first, requested_full_last;
+
+  void request_full_map(epoch_t first, epoch_t last);
+  void rerequest_full_maps() {
+    epoch_t first = requested_full_first;
+    epoch_t last = requested_full_last;
+    requested_full_first = 0;
+    requested_full_last = 0;
+    request_full_map(first, last);
+  }
+  void got_full_map(epoch_t e);
+
+  // -- failures --
+  std::map<int,utime_t> failure_queue;
+  std::map<int,std::pair<utime_t,entity_addrvec_t> > failure_pending;
+
+  void requeue_failures();
+  void send_failures();
+  void send_still_alive(epoch_t epoch, int osd, const entity_addrvec_t &addrs);
+  void cancel_pending_failures();
+
+  ceph::coarse_mono_clock::time_point last_sent_beacon;
+  ceph::mutex min_last_epoch_clean_lock = ceph::make_mutex("OSD::min_last_epoch_clean_lock");
+  epoch_t min_last_epoch_clean = 0;
+  // which pgs were scanned for min_lec
+  std::vector<pg_t> min_last_epoch_clean_pgs;
+  void send_beacon(const ceph::coarse_mono_clock::time_point& now);
+
+  ceph_tid_t get_tid() {
+    return service.get_tid();
+  }
+
+  double scrub_sleep_time(bool must_scrub);
+
+  // -- generic pg peering --
+  PeeringCtx create_context();
+  void dispatch_context(PeeringCtx &ctx, PG *pg, OSDMapRef curmap,
+                        ThreadPool::TPHandle *handle = NULL);
+
+  bool require_mon_peer(const Message *m);
+  bool require_mon_or_mgr_peer(const Message *m);
+  bool require_osd_peer(const Message *m);
+  /***
+   * Verifies that we were alive in the given epoch, and that
+   * still are.
+   */
+  bool require_self_aliveness(const Message *m, epoch_t alive_since);
+  /**
+   * Verifies that the OSD who sent the given op has the same
+   * address as in the given std::map.
+   * @pre op was sent by an OSD using the cluster messenger
+   */
+  bool require_same_peer_instance(const Message *m, const OSDMapRef& map,
+				  bool is_fast_dispatch);
+
+  bool require_same_or_newer_map(OpRequestRef& op, epoch_t e,
+				 bool is_fast_dispatch);
+
+  void handle_fast_pg_create(MOSDPGCreate2 *m);
+  void handle_fast_pg_query(MOSDPGQuery *m);
+  void handle_pg_query_nopg(const MQuery& q);
+  void handle_fast_pg_notify(MOSDPGNotify *m);
+  void handle_pg_notify_nopg(const MNotifyRec& q);
+  void handle_fast_pg_info(MOSDPGInfo *m);
+  void handle_fast_pg_remove(MOSDPGRemove *m);
+
+public:
+  // used by OSDShard
+  PGRef handle_pg_create_info(const OSDMapRef& osdmap, const PGCreateInfo *info);
+protected:
+
+  void handle_fast_force_recovery(MOSDForceRecovery *m);
+
+  // -- commands --
+  void handle_command(class MCommand *m);
+
+
+  // -- pg recovery --
+  void do_recovery(PG *pg, epoch_t epoch_queued, uint64_t pushes_reserved,
+		   ThreadPool::TPHandle &handle);
+
+
+  // -- scrubbing --
+  void sched_scrub();
+  void resched_all_scrubs();
+  bool scrub_random_backoff();
+  bool scrub_load_below_threshold();
+  bool scrub_time_permit(utime_t now);
+
+  // -- status reporting --
+  MPGStats *collect_pg_stats();
+  std::vector<DaemonHealthMetric> get_health_metrics();
+
+
+private:
+  bool ms_can_fast_dispatch_any() const override { return true; }
+  bool ms_can_fast_dispatch(const Message *m) const override {
+    switch (m->get_type()) {
+    case CEPH_MSG_PING:
+    case CEPH_MSG_OSD_OP:
+    case CEPH_MSG_OSD_BACKOFF:
+    case MSG_OSD_SCRUB2:
+    case MSG_OSD_FORCE_RECOVERY:
+    case MSG_MON_COMMAND:
+    case MSG_OSD_PG_CREATE2:
+    case MSG_OSD_PG_QUERY:
+    case MSG_OSD_PG_QUERY2:
+    case MSG_OSD_PG_INFO:
+    case MSG_OSD_PG_INFO2:
+    case MSG_OSD_PG_NOTIFY:
+    case MSG_OSD_PG_NOTIFY2:
+    case MSG_OSD_PG_LOG:
+    case MSG_OSD_PG_TRIM:
+    case MSG_OSD_PG_REMOVE:
+    case MSG_OSD_BACKFILL_RESERVE:
+    case MSG_OSD_RECOVERY_RESERVE:
+    case MSG_OSD_REPOP:
+    case MSG_OSD_REPOPREPLY:
+    case MSG_OSD_PG_PUSH:
+    case MSG_OSD_PG_PULL:
+    case MSG_OSD_PG_PUSH_REPLY:
+    case MSG_OSD_PG_SCAN:
+    case MSG_OSD_PG_BACKFILL:
+    case MSG_OSD_PG_BACKFILL_REMOVE:
+    case MSG_OSD_EC_WRITE:
+    case MSG_OSD_EC_WRITE_REPLY:
+    case MSG_OSD_EC_READ:
+    case MSG_OSD_EC_READ_REPLY:
+    case MSG_OSD_SCRUB_RESERVE:
+    case MSG_OSD_REP_SCRUB:
+    case MSG_OSD_REP_SCRUBMAP:
+    case MSG_OSD_PG_UPDATE_LOG_MISSING:
+    case MSG_OSD_PG_UPDATE_LOG_MISSING_REPLY:
+    case MSG_OSD_PG_RECOVERY_DELETE:
+    case MSG_OSD_PG_RECOVERY_DELETE_REPLY:
+    case MSG_OSD_PG_LEASE:
+    case MSG_OSD_PG_LEASE_ACK:
+      return true;
+    default:
+      return false;
+    }
+  }
+  void ms_fast_dispatch(Message *m) override;
+  bool ms_dispatch(Message *m) override;
+  void ms_handle_connect(Connection *con) override;
+  void ms_handle_fast_connect(Connection *con) override;
+  void ms_handle_fast_accept(Connection *con) override;
+  int ms_handle_authentication(Connection *con) override;
+  bool ms_handle_reset(Connection *con) override;
+  void ms_handle_remote_reset(Connection *con) override {}
+  bool ms_handle_refused(Connection *con) override;
+
+ public:
+  /* internal and external can point to the same messenger, they will still
+   * be cleaned up properly*/
+  OSD(CephContext *cct_,
+      ObjectStore *store_,
+      int id,
+      Messenger *internal,
+      Messenger *external,
+      Messenger *hb_front_client,
+      Messenger *hb_back_client,
+      Messenger *hb_front_server,
+      Messenger *hb_back_server,
+      Messenger *osdc_messenger,
+      MonClient *mc, const std::string &dev, const std::string &jdev,
+      ceph::async::io_context_pool& poolctx);
+  ~OSD() override;
+
+  // static bits
+  static int mkfs(CephContext *cct, ObjectStore *store, uuid_d fsid, int whoami, std::string osdspec_affinity);
+
+  /* remove any non-user xattrs from a std::map of them */
+  void filter_xattrs(std::map<std::string, ceph::buffer::ptr>& attrs) {
+    for (std::map<std::string, ceph::buffer::ptr>::iterator iter = attrs.begin();
+	 iter != attrs.end();
+	 ) {
+      if (('_' != iter->first.at(0)) || (iter->first.size() == 1))
+	attrs.erase(iter++);
+      else ++iter;
+    }
+  }
+
+private:
+  int mon_cmd_maybe_osd_create(std::string &cmd);
+  int update_crush_device_class();
+  int update_crush_location();
+
+  static int write_meta(CephContext *cct,
+			ObjectStore *store,
+			uuid_d& cluster_fsid, uuid_d& osd_fsid, int whoami, std::string& osdspec_affinity);
+
+  void handle_scrub(class MOSDScrub *m);
+  void handle_fast_scrub(class MOSDScrub2 *m);
+  void handle_osd_ping(class MOSDPing *m);
+
+  size_t get_num_cache_shards();
+  int get_num_op_shards();
+  int get_num_op_threads();
+
+  float get_osd_recovery_sleep();
+  float get_osd_delete_sleep();
+  float get_osd_snap_trim_sleep();
+
+  int get_recovery_max_active();
+  void maybe_override_max_osd_capacity_for_qos();
+  bool maybe_override_options_for_qos();
+  int run_osd_bench_test(int64_t count,
+                         int64_t bsize,
+                         int64_t osize,
+                         int64_t onum,
+                         double *elapsed,
+                         std::ostream& ss);
+  int mon_cmd_set_config(const std::string &key, const std::string &val);
+
+  void scrub_purged_snaps();
+  void probe_smart(const std::string& devid, std::ostream& ss);
+
+public:
+  static int peek_meta(ObjectStore *store,
+		       std::string *magic,
+		       uuid_d *cluster_fsid,
+		       uuid_d *osd_fsid,
+		       int *whoami,
+		       ceph_release_t *min_osd_release);
+
+
+  // startup/shutdown
+  int pre_init();
+  int init();
+  void final_init();
+
+  int enable_disable_fuse(bool stop);
+  int set_numa_affinity();
+
+  void suicide(int exitcode);
+  int shutdown();
+
+  void handle_signal(int signum);
+
+  /// check if we can throw out op from a disconnected client
+  static bool op_is_discardable(const MOSDOp *m);
+
+public:
+  OSDService service;
+  friend class OSDService;
+
+private:
+  void set_perf_queries(const ConfigPayload &config_payload);
+  MetricPayload get_perf_reports();
+
+  ceph::mutex m_perf_queries_lock = ceph::make_mutex("OSD::m_perf_queries_lock");
+  std::list<OSDPerfMetricQuery> m_perf_queries;
+  std::map<OSDPerfMetricQuery, OSDPerfMetricLimits> m_perf_limits;
+};
+
+
+//compatibility of the executable
+extern const CompatSet::Feature ceph_osd_feature_compat[];
+extern const CompatSet::Feature ceph_osd_feature_ro_compat[];
+extern const CompatSet::Feature ceph_osd_feature_incompat[];
+
+#endif // CEPH_OSD_H