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diff --git a/src/ceph/src/messages/MOSDMarkMeDown.h b/src/ceph/src/messages/MOSDMarkMeDown.h
new file mode 100644
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+++ b/src/ceph/src/messages/MOSDMarkMeDown.h
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+// -*- 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 : public PaxosServiceMessage {
+
+  static const int HEAD_VERSION = 2;
+  static const int COMPAT_VERSION = 2;
+
+ public:
+  uuid_d fsid;
+  entity_inst_t target_osd;
+  epoch_t epoch = 0;
+  bool request_ack = false;          // ack requested
+
+  MOSDMarkMeDown()
+    : PaxosServiceMessage(MSG_OSD_MARK_ME_DOWN, 0,
+			  HEAD_VERSION, COMPAT_VERSION) { }
+  MOSDMarkMeDown(const uuid_d &fs, const entity_inst_t& f,
+		 epoch_t e, bool request_ack)
+    : PaxosServiceMessage(MSG_OSD_MARK_ME_DOWN, e,
+			  HEAD_VERSION, COMPAT_VERSION),
+      fsid(fs), target_osd(f), epoch(e), request_ack(request_ack) {}
+ private:
+  ~MOSDMarkMeDown() override {}
+
+public: 
+  entity_inst_t get_target() const { return target_osd; }
+  epoch_t get_epoch() const { return epoch; }
+
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    paxos_decode(p);
+    ::decode(fsid, p);
+    ::decode(target_osd, p);
+    ::decode(epoch, p);
+    ::decode(request_ack, p);
+  }
+
+  void encode_payload(uint64_t features) override {
+    paxos_encode();
+    ::encode(fsid, payload);
+    ::encode(target_osd, payload, features);
+    ::encode(epoch, payload);
+    ::encode(request_ack, payload);
+  }
+
+  const char *get_type_name() const override { return "MOSDMarkMeDown"; }
+  void print(ostream& out) const override {
+    out << "MOSDMarkMeDown("
+	<< "request_ack=" << request_ack
+	<< ", target_osd=" << target_osd
+	<< ", fsid=" << fsid
+	<< ")";
+  }
+};
+
+#endif