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diff --git a/src/ceph/src/mds/snap.h b/src/ceph/src/mds/snap.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/mds/snap.h
@@ -0,0 +1,92 @@
+// -*- 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_MDS_SNAP_H
+#define CEPH_MDS_SNAP_H
+
+#include "mdstypes.h"
+#include "common/snap_types.h"
+
+/*
+ * generic snap descriptor.
+ */
+struct SnapInfo {
+  snapid_t snapid;
+  inodeno_t ino;
+  utime_t stamp;
+  string name;
+
+  string long_name; ///< cached _$ino_$name
+  
+  void encode(bufferlist &bl) const;
+  void decode(bufferlist::iterator &bl);
+  void dump(Formatter *f) const;
+  static void generate_test_instances(list<SnapInfo*>& ls);
+
+  const string& get_long_name();
+};
+WRITE_CLASS_ENCODER(SnapInfo)
+
+ostream& operator<<(ostream& out, const SnapInfo &sn);
+
+
+/*
+ * SnapRealm - a subtree that shares the same set of snapshots.
+ */
+struct SnapRealm;
+class CInode;
+class MDCache;
+
+
+
+#include "Capability.h"
+
+struct snaplink_t {
+  inodeno_t ino;
+  snapid_t first;
+
+  void encode(bufferlist &bl) const;
+  void decode(bufferlist::iterator &bl);
+  void dump(Formatter *f) const;
+  static void generate_test_instances(list<snaplink_t*>& ls);
+};
+WRITE_CLASS_ENCODER(snaplink_t)
+
+ostream& operator<<(ostream& out, const snaplink_t &l);
+
+
+// carry data about a specific version of a SnapRealm
+struct sr_t {
+  snapid_t seq;                     // basically, a version/seq # for changes to _this_ realm.
+  snapid_t created;                 // when this realm was created.
+  snapid_t last_created;            // last snap created in _this_ realm.
+  snapid_t last_destroyed;          // seq for last removal
+  snapid_t current_parent_since;
+  map<snapid_t, SnapInfo> snaps;
+  map<snapid_t, snaplink_t> past_parents;  // key is "last" (or NOSNAP)
+
+  sr_t()
+    : seq(0), created(0),
+      last_created(0), last_destroyed(0),
+      current_parent_since(1)
+  {}
+
+  void encode(bufferlist &bl) const;
+  void decode(bufferlist::iterator &bl);
+  void dump(Formatter *f) const;
+  static void generate_test_instances(list<sr_t*>& ls);
+};
+WRITE_CLASS_ENCODER(sr_t)
+
+#endif