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diff --git a/src/ceph/src/tools/cephfs/JournalFilter.h b/src/ceph/src/tools/cephfs/JournalFilter.h
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+++ b/src/ceph/src/tools/cephfs/JournalFilter.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) 2014 john spray <john.spray@inktank.com>
+ *
+ * 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_FILTER_H
+#define JOURNAL_FILTER_H
+
+#include "mds/mdstypes.h"
+#include "mds/LogEvent.h"
+
+/**
+ * A set of conditions for narrowing down a search through the journal
+ */
+class JournalFilter
+{
+  private:
+
+  /* Filtering by journal offset range */
+  uint64_t range_start;
+  uint64_t range_end;
+  static const std::string range_separator;
+
+  /* Filtering by file (sub) path */
+  std::string path_expr;
+
+  /* Filtering by inode */
+  inodeno_t inode;
+
+  /* Filtering by type */
+  LogEvent::EventType event_type;
+
+  /* Filtering by dirfrag */
+  dirfrag_t frag;
+  std::string frag_dentry;  //< optional, filter dentry name within fragment
+
+  /* Filtering by metablob client name */
+  entity_name_t client_name;
+
+  public:
+  JournalFilter() : 
+    range_start(0),
+    range_end(-1),
+    inode(0),
+    event_type(0) {}
+
+  bool get_range(uint64_t &start, uint64_t &end) const;
+  bool apply(uint64_t pos, LogEvent &le) const;
+  int parse_args(
+    std::vector<const char*> &argv, 
+    std::vector<const char*>::iterator &arg);
+};
+
+#endif // JOURNAL_FILTER_H
+