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diff --git a/src/mds/JournalPointer.h b/src/mds/JournalPointer.h
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+++ b/src/mds/JournalPointer.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 JOURNAL_POINTER_H
+#define JOURNAL_POINTER_H
+
+#include "include/encoding.h"
+#include "mdstypes.h"
+
+class Objecter;
+class Mutex;
+
+// This always lives in the same location for a given MDS
+// instance, it tells the daemon where to look for the journal.
+class JournalPointer {
+  // MDS rank
+  int node_id;
+  // Metadata pool ID
+  int64_t pool_id;
+
+  std::string get_object_id() const;
+
+  public:
+  // The currently active journal
+  inodeno_t front;
+  // The backup journal, if any (may be 0)
+  inodeno_t back;
+
+  void encode(bufferlist &bl) const {
+    ENCODE_START(1, 1, bl);
+    encode(front, bl);
+    encode(back, bl);
+    ENCODE_FINISH(bl);
+  }
+
+  void decode(bufferlist::const_iterator &bl) {
+    DECODE_START(1, bl);
+    decode(front, bl);
+    decode(back, bl);
+    DECODE_FINISH(bl);
+  }
+
+  JournalPointer(int node_id_, int64_t pool_id_) : node_id(node_id_), pool_id(pool_id_),
+    front(0), back(0) {}
+
+  JournalPointer() : node_id(-1), pool_id(-1), front(0), back(0) {}
+
+  int load(Objecter *objecter);
+  int save(Objecter *objecter) const;
+  void save(Objecter *objecter, Context *completion) const;
+
+  bool is_null() const {
+    return front == 0 && back == 0;
+  }
+
+  void dump(Formatter *f) const {
+    f->open_object_section("journal_pointer");
+    {
+      f->dump_unsigned("front", front);
+      f->dump_unsigned("back", back);
+    }
+    f->close_section(); // journal_header
+  }
+
+  static void generate_test_instances(std::list<JournalPointer*> &ls)
+  {
+    ls.push_back(new JournalPointer());
+    ls.push_back(new JournalPointer());
+    ls.back()->front = 0xdeadbeef;
+    ls.back()->back = 0xfeedbead;
+  }
+};
+WRITE_CLASS_ENCODER(JournalPointer)
+
+#endif // JOURNAL_POINTER_H