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diff --git a/src/ceph/src/mds/LogSegment.h b/src/ceph/src/mds/LogSegment.h
new file mode 100644
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+++ b/src/ceph/src/mds/LogSegment.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_LOGSEGMENT_H
+#define CEPH_LOGSEGMENT_H
+
+#include "include/elist.h"
+#include "include/interval_set.h"
+#include "include/Context.h"
+#include "mdstypes.h"
+#include "CInode.h"
+#include "CDentry.h"
+#include "CDir.h"
+#include "MDSContext.h"
+
+#include "include/unordered_set.h"
+using ceph::unordered_set;
+
+class CDir;
+class CInode;
+class CDentry;
+class MDSRank;
+struct MDSlaveUpdate;
+
+typedef uint64_t log_segment_seq_t;
+
+class LogSegment {
+ public:
+  const log_segment_seq_t seq;
+  uint64_t offset, end;
+  int num_events;
+
+  // dirty items
+  elist<CDir*>    dirty_dirfrags, new_dirfrags;
+  elist<CInode*>  dirty_inodes;
+  elist<CDentry*> dirty_dentries;
+
+  elist<CInode*>  open_files;
+  elist<CInode*>  dirty_parent_inodes;
+  elist<CInode*>  dirty_dirfrag_dir;
+  elist<CInode*>  dirty_dirfrag_nest;
+  elist<CInode*>  dirty_dirfrag_dirfragtree;
+
+  elist<MDSlaveUpdate*> slave_updates;
+  
+  set<CInode*> truncating_inodes;
+
+  map<int, ceph::unordered_set<version_t> > pending_commit_tids;  // mdstable
+  set<metareqid_t> uncommitted_masters;
+  set<dirfrag_t> uncommitted_fragments;
+
+  // client request ids
+  map<int, ceph_tid_t> last_client_tids;
+
+  // potentially dirty sessions
+  std::set<entity_name_t> touched_sessions;
+
+  // table version
+  version_t inotablev;
+  version_t sessionmapv;
+  map<int,version_t> tablev;
+
+  // try to expire
+  void try_to_expire(MDSRank *mds, MDSGatherBuilder &gather_bld, int op_prio);
+
+  std::list<MDSInternalContextBase*> expiry_waiters;
+
+  void wait_for_expiry(MDSInternalContextBase *c)
+  {
+    assert(c != NULL);
+    expiry_waiters.push_back(c);
+  }
+
+  // cons
+  LogSegment(uint64_t _seq, loff_t off=-1) :
+    seq(_seq), offset(off), end(off), num_events(0),
+    dirty_dirfrags(member_offset(CDir, item_dirty)),
+    new_dirfrags(member_offset(CDir, item_new)),
+    dirty_inodes(member_offset(CInode, item_dirty)),
+    dirty_dentries(member_offset(CDentry, item_dirty)),
+    open_files(member_offset(CInode, item_open_file)),
+    dirty_parent_inodes(member_offset(CInode, item_dirty_parent)),
+    dirty_dirfrag_dir(member_offset(CInode, item_dirty_dirfrag_dir)),
+    dirty_dirfrag_nest(member_offset(CInode, item_dirty_dirfrag_nest)),
+    dirty_dirfrag_dirfragtree(member_offset(CInode, item_dirty_dirfrag_dirfragtree)),
+    slave_updates(0), // passed to begin() manually
+    inotablev(0), sessionmapv(0)
+  { }
+};
+
+#endif