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diff --git a/src/ceph/src/common/bit_str.h b/src/ceph/src/common/bit_str.h
new file mode 100644
index 0000000..02c7db9
--- /dev/null
+++ b/src/ceph/src/common/bit_str.h
@@ -0,0 +1,35 @@
+// -*- 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) 2016 SUSE LINUX GmbH
+ *
+ * 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_COMMON_BIT_STR_H
+#define CEPH_COMMON_BIT_STR_H
+
+#include <functional>
+
+namespace ceph {
+  class Formatter;
+}
+
+extern void print_bit_str(
+    uint64_t bits,
+    std::ostream &out,
+    std::function<const char*(uint64_t)> func,
+    bool dump_bit_val = false);
+
+extern void dump_bit_str(
+    uint64_t bits,
+    ceph::Formatter *f,
+    std::function<const char*(uint64_t)> func,
+    bool dump_bit_val = false);
+
+#endif /* CEPH_COMMON_BIT_STR_H */