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diff --git a/src/tools/cephfs/Dumper.h b/src/tools/cephfs/Dumper.h
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+++ b/src/tools/cephfs/Dumper.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) 2010 Greg Farnum <gregf@hq.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_DUMPER_H_
+#define JOURNAL_DUMPER_H_
+
+
+#include "MDSUtility.h"
+
+class Journaler;
+
+/**
+ * This class lets you dump out an mds journal for troubleshooting or whatever.
+ *
+ * It was built to work with cmds so some of the design choices are random.
+ * To use, create a Dumper, call init(), and then call dump() with the name
+ * of the file to dump to.
+ */
+
+class Dumper : public MDSUtility {
+private:
+  mds_role_t role;
+  inodeno_t ino;
+
+public:
+  Dumper() : ino(-1)
+  {}
+
+  int init(mds_role_t role_, const std::string &type);
+  int recover_journal(Journaler *journaler);
+  int dump(const char *dumpfile);
+  int undump(const char *dumpfile, bool force);
+};
+
+#endif /* JOURNAL_DUMPER_H_ */