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diff --git a/src/ceph/src/messages/MDataPing.h b/src/ceph/src/messages/MDataPing.h
new file mode 100644
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+++ b/src/ceph/src/messages/MDataPing.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.
+ * 
+ */
+
+#ifndef CEPH_MDATAPING_H
+#define CEPH_MDATAPING_H
+
+#include "msg/Message.h"
+#include "messages/MPing.h"
+#include "include/encoding.h"
+#if defined(HAVE_XIO)
+extern "C" {
+#include "libxio.h"
+}
+#else
+struct xio_reg_mem {};
+#endif /* HAVE_XIO */
+
+typedef void (*mdata_hook_func)(struct xio_reg_mem *mp);
+
+class MDataPing : public Message {
+
+ public:
+
+  static const int HEAD_VERSION = 1;
+  static const int COMPAT_VERSION = 1;
+
+  std::string tag;
+  uint32_t counter;
+  mdata_hook_func mdata_hook;
+  struct xio_reg_mem mp;
+  bool free_data;
+
+  MDataPing()
+    : Message(MSG_DATA_PING, HEAD_VERSION, COMPAT_VERSION),
+      mdata_hook(NULL),
+      free_data(false)
+  {}
+
+  struct xio_reg_mem *get_mp()
+    {
+      return &mp;
+    }
+
+  void set_rdma_hook(mdata_hook_func hook)
+    {
+      mdata_hook = hook;
+    }
+
+private:
+  ~MDataPing() override
+    {
+      if (mdata_hook)
+	mdata_hook(&mp);
+
+      if (free_data)  {
+	const std::list<buffer::ptr>& buffers = data.buffers();
+	list<bufferptr>::const_iterator pb;
+	for (pb = buffers.begin(); pb != buffers.end(); ++pb) {
+	  free((void*) pb->c_str());
+	}
+      }
+    }
+
+public:
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    ::decode(tag, p);
+    ::decode(counter, p);
+  }
+  void encode_payload(uint64_t features) override {
+    ::encode(tag, payload);
+    ::encode(counter, payload);
+  }
+
+  const char *get_type_name() const override { return "data_ping"; }
+
+  void print(ostream& out) const override {
+    out << get_type_name() << " " << tag << " " << counter;
+  }
+};
+
+#endif /* CEPH_MDATAPING_H */