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diff --git a/src/ceph/src/librados/snap_set_diff.h b/src/ceph/src/librados/snap_set_diff.h
new file mode 100644
index 0000000..aba03ee
--- /dev/null
+++ b/src/ceph/src/librados/snap_set_diff.h
@@ -0,0 +1,17 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef __CEPH_OSDC_SNAP_SET_DIFF_H
+#define __CEPH_OSDC_SNAP_SET_DIFF_H
+
+class CephContext;
+#include "include/rados/rados_types.hpp"
+#include "include/interval_set.h"
+
+void calc_snap_set_diff(CephContext *cct,
+			const librados::snap_set_t& snap_set,
+			librados::snap_t start, librados::snap_t end,
+			interval_set<uint64_t> *diff, uint64_t *end_size,
+			bool *end_exists, librados::snap_t *clone_end_snap_id);
+
+#endif