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diff --git a/src/ceph/src/messages/MOSDPing.h b/src/ceph/src/messages/MOSDPing.h
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+++ b/src/ceph/src/messages/MOSDPing.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) 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 : public Message {
+
+  static const int HEAD_VERSION = 4;
+  static const 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 stamp;
+  uint32_t min_message_size;
+
+  MOSDPing(const uuid_d& f, epoch_t e, __u8 o, utime_t s, uint32_t min_message)
+    : Message(MSG_OSD_PING, HEAD_VERSION, COMPAT_VERSION),
+      fsid(f), map_epoch(e), op(o), stamp(s), min_message_size(min_message)
+  { }
+  MOSDPing()
+    : Message(MSG_OSD_PING, HEAD_VERSION, COMPAT_VERSION), min_message_size(0)
+  {}
+private:
+  ~MOSDPing() override {}
+
+public:
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    ::decode(fsid, p);
+    ::decode(map_epoch, p);
+    if (header.version < 4) {
+      osd_peer_stat_t peer_stat;
+      epoch_t peer_as_of_epoch;
+      ::decode(peer_as_of_epoch, p);
+      ::decode(op, p);
+      ::decode(peer_stat, p);
+    } else {
+      ::decode(op, p);
+    }
+    ::decode(stamp, p);
+    if (header.version >= 3) {
+      int payload_mid_length = p.get_off();
+      uint32_t size;
+      ::decode(size, p);
+      p.advance(size);
+      min_message_size = size + payload_mid_length;
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    ::encode(fsid, payload);
+    ::encode(map_epoch, payload);
+    
+    // with luminous, we drop peer_as_of_epoch and peer_stat
+    if (HAVE_FEATURE(features, SERVER_LUMINOUS)) {
+      header.version = HEAD_VERSION;
+      ::encode(op, payload);
+    } else {
+      epoch_t dummy_epoch = {};
+      osd_peer_stat_t dummy_stat = {};
+      header.version = 3;
+      header.compat_version = 2;
+      ::encode(dummy_epoch, payload);
+      ::encode(op, payload);   
+      ::encode(dummy_stat, payload);
+    }
+    ::encode(stamp, 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 targetting 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));
+      }
+    }
+  }
+
+  const char *get_type_name() const override { return "osd_ping"; }
+  void print(ostream& out) const override {
+    out << "osd_ping(" << get_op_name(op)
+	<< " e" << map_epoch
+	<< " stamp " << stamp
+	<< ")";
+  }
+};
+
+#endif