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diff --git a/src/messages/MOSDBoot.h b/src/messages/MOSDBoot.h
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+++ b/src/messages/MOSDBoot.h
@@ -0,0 +1,120 @@
+// -*- 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 : public MessageInstance<MOSDBoot, PaxosServiceMessage> {
+public:
+  friend factory;
+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)
+  map<string,string> metadata; ///< misc metadata about this osd
+  uint64_t osd_features;
+
+  MOSDBoot()
+    : MessageInstance(MSG_OSD_BOOT, 0, HEAD_VERSION, COMPAT_VERSION),
+      boot_epoch(0), osd_features(0)
+  { }
+  MOSDBoot(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)
+    : MessageInstance(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() override { }
+
+public:
+  std::string_view get_type_name() const override { return "osd_boot"; }
+  void print(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();
+    if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      header.version = 6;
+      header.compat_version = 6;
+      encode(sb, payload);
+      hb_back_addrs.legacy_addr().encode(payload, features);
+      cluster_addrs.legacy_addr().encode(payload, features);
+      encode(boot_epoch, payload);
+      hb_front_addrs.legacy_addr().encode(payload, features);
+      encode(metadata, payload);
+      encode(osd_features, payload);
+      return;
+    }
+    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();
+    paxos_decode(p);
+    if (header.version < 7) {
+      entity_addr_t a;
+      decode(sb, p);
+      decode(a, p);
+      hb_back_addrs = entity_addrvec_t(a);
+      decode(a, p);
+      cluster_addrs = entity_addrvec_t(a);
+      decode(boot_epoch, p);
+      decode(a, p);
+      hb_front_addrs = entity_addrvec_t(a);
+      decode(metadata, p);
+      decode(osd_features, p);
+      return;
+    }
+    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);
+  }
+};
+
+#endif