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diff --git a/src/ceph/src/messages/MLogAck.h b/src/ceph/src/messages/MLogAck.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/messages/MLogAck.h
@@ -0,0 +1,49 @@
+// -*- 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_MLOGACK_H
+#define CEPH_MLOGACK_H
+
+class MLogAck : public Message {
+public:
+  uuid_d fsid;
+  version_t last;
+  std::string channel;
+
+  MLogAck() : Message(MSG_LOGACK) {}
+  MLogAck(uuid_d& f, version_t l) : Message(MSG_LOGACK), fsid(f), last(l) {}
+private:
+  ~MLogAck() override {}
+
+public:
+  const char *get_type_name() const override { return "log_ack"; }
+  void print(ostream& out) const override {
+    out << "log(last " << last << ")";
+  }
+
+  void encode_payload(uint64_t features) override {
+    ::encode(fsid, payload);
+    ::encode(last, payload);
+    ::encode(channel, payload);
+  }
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    ::decode(fsid, p);
+    ::decode(last, p);
+    if (!p.end())
+      ::decode(channel, p);
+  }
+};
+
+#endif