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diff --git a/src/ceph/src/msg/xio/XioMessenger.h b/src/ceph/src/msg/xio/XioMessenger.h
new file mode 100644
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+++ b/src/ceph/src/msg/xio/XioMessenger.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>
+ * Portions Copyright (C) 2013 CohortFS, LLC
+ *
+ * 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 XIO_MESSENGER_H
+#define XIO_MESSENGER_H
+
+#include "msg/SimplePolicyMessenger.h"
+
+#include <atomic>
+
+extern "C" {
+#include "libxio.h"
+}
+
+#include "XioConnection.h"
+#include "XioPortal.h"
+#include "QueueStrategy.h"
+#include "common/Thread.h"
+#include "common/Mutex.h"
+#include "include/Spinlock.h"
+
+class XioInit {
+  /* safe to be called multiple times */
+  void package_init(CephContext *cct);
+
+protected:
+  XioInit(CephContext *cct) {
+    this->package_init(cct);
+  }
+};
+
+class XioMessenger : public SimplePolicyMessenger, XioInit
+{
+private:
+  static std::atomic<uint64_t> nInstances = { 0 };
+  std::atomic<uint64_t> nsessions = { 0 };
+  std::atomic<bool> shutdown_called = { false };
+  Spinlock conns_sp;
+  XioConnection::ConnList conns_list;
+  XioConnection::EntitySet conns_entity_map;
+  XioPortals portals;
+  DispatchStrategy* dispatch_strategy;
+  XioLoopbackConnectionRef loop_con;
+  uint32_t special_handling;
+  Mutex sh_mtx;
+  Cond sh_cond;
+  bool need_addr;
+  bool did_bind;
+
+  /// approximately unique ID set by the Constructor for use in entity_addr_t
+  uint64_t nonce;
+
+  friend class XioConnection;
+
+public:
+  XioMessenger(CephContext *cct, entity_name_t name,
+	       string mname, uint64_t nonce,
+	       uint64_t cflags = 0,
+	       DispatchStrategy* ds = new QueueStrategy(1));
+
+  virtual ~XioMessenger();
+
+  XioPortal* get_portal() { return portals.get_next_portal(); }
+
+  virtual void set_myaddr(const entity_addr_t& a) {
+    Messenger::set_myaddr(a);
+    loop_con->set_peer_addr(a);
+  }
+
+  int _send_message(Message *m, const entity_inst_t &dest);
+  int _send_message(Message *m, Connection *con);
+  int _send_message_impl(Message *m, XioConnection *xcon);
+
+  uint32_t get_special_handling() { return special_handling; }
+  void set_special_handling(int n) { special_handling = n; }
+  int pool_hint(uint32_t size);
+  void try_insert(XioConnection *xcon);
+
+  /* xio hooks */
+  int new_session(struct xio_session *session,
+		  struct xio_new_session_req *req,
+		  void *cb_user_context);
+
+  int session_event(struct xio_session *session,
+		    struct xio_session_event_data *event_data,
+		    void *cb_user_context);
+
+  /* Messenger interface */
+  virtual void set_addr_unknowns(const entity_addr_t &addr) override
+    { } /* XXX applicable? */
+  virtual void set_addr(const entity_addr_t &addr) override
+    { } /* XXX applicable? */
+
+  virtual int get_dispatch_queue_len()
+    { return 0; } /* XXX bogus? */
+
+  virtual double get_dispatch_queue_max_age(utime_t now)
+    { return 0; } /* XXX bogus? */
+
+  virtual void set_cluster_protocol(int p)
+    { }
+
+  virtual int bind(const entity_addr_t& addr);
+
+  virtual int rebind(const set<int>& avoid_ports);
+
+  virtual int start();
+
+  virtual void wait();
+
+  virtual int shutdown();
+
+  virtual int send_message(Message *m, const entity_inst_t &dest) {
+    return _send_message(m, dest);
+  }
+
+  virtual int lazy_send_message(Message *m, const entity_inst_t& dest)
+    { return EINVAL; }
+
+  virtual int lazy_send_message(Message *m, Connection *con)
+    { return EINVAL; }
+
+  virtual ConnectionRef get_connection(const entity_inst_t& dest);
+
+  virtual ConnectionRef get_loopback_connection();
+
+  void unregister_xcon(XioConnection *xcon);
+  virtual void mark_down(const entity_addr_t& a);
+  virtual void mark_down(Connection *con);
+  virtual void mark_down_all();
+  virtual void mark_down_on_empty(Connection *con);
+  virtual void mark_disposable(Connection *con);
+
+  void ds_dispatch(Message *m)
+    { dispatch_strategy->ds_dispatch(m); }
+
+  /**
+   * Tell the XioMessenger its full IP address.
+   *
+   * This is used by clients when connecting to other endpoints, and
+   * probably shouldn't be called by anybody else.
+   */
+  void learned_addr(const entity_addr_t& peer_addr_for_me);
+
+private:
+  int get_nconns_per_portal(uint64_t cflags);
+  int get_nportals(uint64_t cflags);
+
+protected:
+  virtual void ready()
+    { }
+};
+
+XioCommand* pool_alloc_xio_command(XioConnection *xcon);
+
+
+#endif /* XIO_MESSENGER_H */