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diff --git a/src/mon/PaxosFSMap.h b/src/mon/PaxosFSMap.h
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+++ b/src/mon/PaxosFSMap.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_PAXOS_FSMAP_H
+#define CEPH_PAXOS_FSMAP_H
+
+#include "mds/FSMap.h"
+#include "mds/MDSMap.h"
+
+#include "include/ceph_assert.h"
+
+class PaxosFSMap {
+public:
+  virtual ~PaxosFSMap() {}
+
+  const FSMap &get_pending_fsmap() const { ceph_assert(is_leader()); return pending_fsmap; }
+  const FSMap &get_fsmap() const { return fsmap; }
+
+  virtual bool is_leader() const = 0;
+
+protected:
+  FSMap &get_pending_fsmap_writeable() { ceph_assert(is_leader()); return pending_fsmap; }
+
+  FSMap &create_pending() {
+    ceph_assert(is_leader());
+    pending_fsmap = fsmap;
+    pending_fsmap.epoch++;
+    return pending_fsmap;
+  }
+
+  void decode(bufferlist &bl) {
+    fsmap.decode(bl);
+    pending_fsmap = FSMap(); /* nuke it to catch invalid access */
+  }
+
+private:
+  /* Keep these PRIVATE to prevent unprotected manipulation. */
+  FSMap fsmap; /* the current epoch */
+  FSMap pending_fsmap; /* the next epoch */
+};
+
+
+#endif