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diff --git a/src/ceph/src/librbd/api/DiffIterate.h b/src/ceph/src/librbd/api/DiffIterate.h
new file mode 100644
index 0000000..e6074d9
--- /dev/null
+++ b/src/ceph/src/librbd/api/DiffIterate.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_API_DIFF_ITERATE_H
+#define CEPH_LIBRBD_API_DIFF_ITERATE_H
+
+#include "include/int_types.h"
+#include "common/bit_vector.hpp"
+#include "cls/rbd/cls_rbd_types.h"
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace api {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class DiffIterate {
+public:
+  typedef int (*Callback)(uint64_t, size_t, int, void *);
+
+  static int diff_iterate(ImageCtxT *ictx,
+			  const cls::rbd::SnapshotNamespace& from_snap_namespace,
+			  const char *fromsnapname,
+                          uint64_t off, uint64_t len, bool include_parent,
+                          bool whole_object,
+		          int (*cb)(uint64_t, size_t, int, void *),
+		          void *arg);
+
+private:
+  ImageCtxT &m_image_ctx;
+  cls::rbd::SnapshotNamespace m_from_snap_namespace;
+  const char* m_from_snap_name;
+  uint64_t m_offset;
+  uint64_t m_length;
+  bool m_include_parent;
+  bool m_whole_object;
+  Callback m_callback;
+  void *m_callback_arg;
+
+  DiffIterate(ImageCtxT &image_ctx, 
+	      const cls::rbd::SnapshotNamespace& from_snap_namespace,
+	      const char *from_snap_name, uint64_t off, uint64_t len,
+	      bool include_parent, bool whole_object, Callback callback,
+	      void *callback_arg)
+    : m_image_ctx(image_ctx), m_from_snap_namespace(from_snap_namespace),
+      m_from_snap_name(from_snap_name), m_offset(off),
+      m_length(len), m_include_parent(include_parent),
+      m_whole_object(whole_object), m_callback(callback),
+      m_callback_arg(callback_arg)
+  {
+  }
+
+  int execute();
+
+  int diff_object_map(uint64_t from_snap_id, uint64_t to_snap_id,
+                      BitVector<2>* object_diff_state);
+
+};
+
+} // namespace api
+} // namespace librbd
+
+extern template class librbd::api::DiffIterate<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_API_DIFF_ITERATE_H