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diff --git a/src/ceph/src/messages/MCacheExpire.h b/src/ceph/src/messages/MCacheExpire.h
new file mode 100644
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+++ b/src/ceph/src/messages/MCacheExpire.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_MCACHEEXPIRE_H
+#define CEPH_MCACHEEXPIRE_H
+
+#include "mds/mdstypes.h"
+
+class MCacheExpire : public Message {
+  __s32 from;
+
+public:
+  /*
+    group things by realm (auth delgation root), since that's how auth is determined.
+    that makes it less work to process when exports are in progress.
+  */
+  struct realm {
+    map<vinodeno_t, uint32_t> inodes;
+    map<dirfrag_t, uint32_t> dirs;
+    map<dirfrag_t, map<pair<string,snapid_t>,uint32_t> > dentries;
+
+    void merge(realm& o) {
+      inodes.insert(o.inodes.begin(), o.inodes.end());
+      dirs.insert(o.dirs.begin(), o.dirs.end());
+      for (map<dirfrag_t,map<pair<string,snapid_t>,uint32_t> >::iterator p = o.dentries.begin();
+	   p != o.dentries.end();
+	   ++p) {
+	if (dentries.count(p->first) == 0)
+	  dentries[p->first] = p->second;
+	else
+	  dentries[p->first].insert(p->second.begin(), p->second.end());
+      }
+    }
+
+    void encode(bufferlist &bl) const {
+      ::encode(inodes, bl);
+      ::encode(dirs, bl);
+      ::encode(dentries, bl);
+    }
+    void decode(bufferlist::iterator &bl) {
+      ::decode(inodes, bl);
+      ::decode(dirs, bl);
+      ::decode(dentries, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(realm)
+
+  map<dirfrag_t, realm> realms;
+
+  int get_from() { return from; }
+
+  MCacheExpire() : Message(MSG_MDS_CACHEEXPIRE), from(-1) {}
+  MCacheExpire(int f) : 
+    Message(MSG_MDS_CACHEEXPIRE),
+    from(f) { }
+private:
+  ~MCacheExpire() override {}
+
+public:
+  const char *get_type_name() const override { return "cache_expire";}
+  
+  void add_inode(dirfrag_t r, vinodeno_t vino, unsigned nonce) {
+    realms[r].inodes[vino] = nonce;
+  }
+  void add_dir(dirfrag_t r, dirfrag_t df, unsigned nonce) {
+    realms[r].dirs[df] = nonce;
+  }
+  void add_dentry(dirfrag_t r, dirfrag_t df, const string& dn, snapid_t last, unsigned nonce) {
+    realms[r].dentries[df][pair<string,snapid_t>(dn,last)] = nonce;
+  }
+
+  void add_realm(dirfrag_t df, realm& r) {
+    if (realms.count(df) == 0)
+      realms[df] = r;
+    else
+      realms[df].merge(r);
+  }
+
+  void decode_payload() override {
+    bufferlist::iterator p = payload.begin();
+    ::decode(from, p);
+    ::decode(realms, p);
+  }
+    
+  void encode_payload(uint64_t features) override {
+    ::encode(from, payload);
+    ::encode(realms, payload);
+  }
+};
+
+WRITE_CLASS_ENCODER(MCacheExpire::realm)
+
+#endif