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diff --git a/src/ceph/src/messages/MMonSubscribe.h b/src/ceph/src/messages/MMonSubscribe.h
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+++ b/src/ceph/src/messages/MMonSubscribe.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_MMONSUBSCRIBE_H
+#define CEPH_MMONSUBSCRIBE_H
+
+#include "msg/Message.h"
+#include "include/ceph_features.h"
+
+/*
+ * compatibility with old crap
+ */
+struct ceph_mon_subscribe_item_old {
+	__le64 unused;
+	__le64 have;
+	__u8 onetime;
+} __attribute__ ((packed));
+WRITE_RAW_ENCODER(ceph_mon_subscribe_item_old)
+
+
+struct MMonSubscribe : public Message {
+
+  static const int HEAD_VERSION = 2;
+
+  map<string, ceph_mon_subscribe_item> what;
+  
+  MMonSubscribe() : Message(CEPH_MSG_MON_SUBSCRIBE, HEAD_VERSION) { }
+private:
+  ~MMonSubscribe() override {}
+
+public:  
+  void sub_want(const char *w, version_t start, unsigned flags) {
+    what[w].start = start;
+    what[w].flags = flags;
+  }
+
+  const char *get_type_name() const override { return "mon_subscribe"; }
+  void print(ostream& o) const override {
+    o << "mon_subscribe(" << what << ")";
+  }
+
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    if (header.version < 2) {
+      map<string, ceph_mon_subscribe_item_old> oldwhat;
+      ::decode(oldwhat, p);
+      what.clear();
+      for (map<string, ceph_mon_subscribe_item_old>::iterator q = oldwhat.begin();
+	   q != oldwhat.end();
+	   q++) {
+	if (q->second.have)
+	  what[q->first].start = q->second.have + 1;
+	else
+	  what[q->first].start = 0;
+	what[q->first].flags = 0;
+	if (q->second.onetime)
+	  what[q->first].flags |= CEPH_SUBSCRIBE_ONETIME;
+      }
+    } else {
+      ::decode(what, p);
+    }
+  }
+  void encode_payload(uint64_t features) override {
+    if (features & CEPH_FEATURE_SUBSCRIBE2) {
+      ::encode(what, payload);
+      header.version = HEAD_VERSION;
+    } else {
+      header.version = 0;
+      map<string, ceph_mon_subscribe_item_old> oldwhat;
+      for (map<string, ceph_mon_subscribe_item>::iterator q = what.begin();
+	   q != what.end();
+	   q++) {
+	if (q->second.start)
+	  // warning: start=1 -> have=0, which was ambiguous
+	  oldwhat[q->first].have = q->second.start - 1;
+	else
+	  oldwhat[q->first].have = 0;
+	oldwhat[q->first].onetime = q->second.flags & CEPH_SUBSCRIBE_ONETIME;
+      }
+      ::encode(oldwhat, payload);
+    }
+  }
+};
+
+#endif