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diff --git a/src/messages/MCacheExpire.h b/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 <string_view>
+
+#include "msg/Message.h"
+
+#include "mds/mdstypes.h"
+
+class MCacheExpire : public MessageInstance<MCacheExpire> {
+public:
+  friend factory;
+private:
+  __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(const realm& o) {
+      inodes.insert(o.inodes.begin(), o.inodes.end());
+      dirs.insert(o.dirs.begin(), o.dirs.end());
+      for (const auto &p : o.dentries) {
+        auto em = dentries.emplace(std::piecewise_construct, std::forward_as_tuple(p.first), std::forward_as_tuple(p.second));
+        if (!em.second) {
+	  em.first->second.insert(p.second.begin(), p.second.end());
+        }
+      }
+    }
+
+    void encode(bufferlist &bl) const {
+      using ceph::encode;
+      encode(inodes, bl);
+      encode(dirs, bl);
+      encode(dentries, bl);
+    }
+    void decode(bufferlist::const_iterator &bl) {
+      using ceph::decode;
+      decode(inodes, bl);
+      decode(dirs, bl);
+      decode(dentries, bl);
+    }
+  };
+  WRITE_CLASS_ENCODER(realm)
+
+  map<dirfrag_t, realm> realms;
+
+  int get_from() const { return from; }
+
+protected:
+  MCacheExpire() : MessageInstance(MSG_MDS_CACHEEXPIRE), from(-1) {}
+  MCacheExpire(int f) : 
+    MessageInstance(MSG_MDS_CACHEEXPIRE),
+    from(f) { }
+  ~MCacheExpire() override {}
+
+public:
+  std::string_view 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, std::string_view dn, snapid_t last, unsigned nonce) {
+    realms[r].dentries[df][pair<string,snapid_t>(dn,last)] = nonce;
+  }
+
+  void add_realm(dirfrag_t df, const realm& r) {
+    auto em = realms.emplace(std::piecewise_construct, std::forward_as_tuple(df), std::forward_as_tuple(r));
+    if (!em.second) {
+      em.first->second.merge(r);
+    }
+  }
+
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(from, p);
+    decode(realms, p);
+  }
+    
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(from, payload);
+    encode(realms, payload);
+  }
+};
+
+WRITE_CLASS_ENCODER(MCacheExpire::realm)
+
+#endif