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diff --git a/src/ceph/src/common/reverse.h b/src/ceph/src/common/reverse.h
new file mode 100644
index 0000000..9a199a8
--- /dev/null
+++ b/src/ceph/src/common/reverse.h
@@ -0,0 +1,31 @@
+// -*- 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_OS_REVERSE_H
+#define __CEPH_OS_REVERSE_H
+
+#include "include/int_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t reverse_bits(uint32_t v);
+extern uint32_t reverse_nibbles(uint32_t retval);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif