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diff --git a/src/mds/MDSTableClient.h b/src/mds/MDSTableClient.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_MDSTABLECLIENT_H
+#define CEPH_MDSTABLECLIENT_H
+
+#include "include/types.h"
+#include "MDSContext.h"
+#include "mds_table_types.h"
+
+#include "messages/MMDSTableRequest.h"
+
+class MDSRank;
+class LogSegment;
+
+class MDSTableClient {
+protected:
+  MDSRank *mds;
+  int table;
+
+  uint64_t last_reqid;
+
+  bool server_ready;
+
+  // prepares
+  struct _pending_prepare {
+    MDSContext *onfinish;
+    version_t *ptid;
+    bufferlist *pbl; 
+    bufferlist mutation;
+
+    _pending_prepare() : onfinish(0), ptid(0), pbl(0) {}
+    _pending_prepare(MDSContext *c, version_t *pt, bufferlist *pb, bufferlist& m) :
+      onfinish(c), ptid(pt), pbl(pb), mutation(m) {}
+  };
+
+  map<uint64_t, _pending_prepare> pending_prepare;
+  map<version_t, uint64_t> prepared_update;
+  list<_pending_prepare> waiting_for_reqid;
+
+  // pending commits
+  map<version_t, LogSegment*> pending_commit;
+  map<version_t, MDSContext::vec > ack_waiters;
+
+  void handle_reply(class MMDSTableQuery *m);  
+  void _logged_ack(version_t tid);
+  friend class C_LoggedAck;
+
+public:
+  MDSTableClient(MDSRank *m, int tab) :
+    mds(m), table(tab), last_reqid(~0ULL), server_ready(false) {}
+  virtual ~MDSTableClient() {}
+
+  void handle_request(const MMDSTableRequest::const_ref &m);
+
+  void _prepare(bufferlist& mutation, version_t *ptid, bufferlist *pbl, MDSContext *onfinish);
+  void commit(version_t tid, LogSegment *ls);
+
+  void resend_commits();
+  void resend_prepares();
+
+  // for recovery (by me)
+  void got_journaled_agree(version_t tid, LogSegment *ls);
+  void got_journaled_ack(version_t tid);
+
+  bool has_committed(version_t tid) const {
+    return pending_commit.count(tid) == 0;
+  }
+  void wait_for_ack(version_t tid, MDSContext *c) {
+    ack_waiters[tid].push_back(c);
+  }
+
+  set<version_t> get_journaled_tids() const {
+    set<version_t> tids;
+    for (auto p : pending_commit)
+      tids.insert(p.first);
+    return tids;
+  }
+
+  void handle_mds_failure(mds_rank_t mds);
+
+  // child must implement
+  virtual void resend_queries() = 0;
+  virtual void handle_query_result(const MMDSTableRequest::const_ref &m) = 0;
+  virtual void handle_notify_prep(const MMDSTableRequest::const_ref &m) = 0;
+  virtual void notify_commit(version_t tid) = 0;
+
+  // and friendly front-end for _prepare.
+
+};
+
+#endif