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diff --git a/src/ceph/src/librbd/AsyncObjectThrottle.h b/src/ceph/src/librbd/AsyncObjectThrottle.h
new file mode 100644
index 0000000..e1b0896
--- /dev/null
+++ b/src/ceph/src/librbd/AsyncObjectThrottle.h
@@ -0,0 +1,79 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#ifndef CEPH_LIBRBD_ASYNC_OBJECT_THROTTLE_H
+#define CEPH_LIBRBD_ASYNC_OBJECT_THROTTLE_H
+
+#include "include/int_types.h"
+#include "include/Context.h"
+
+#include <boost/function.hpp>
+
+namespace librbd
+{
+template <typename ImageCtxT> class AsyncRequest;
+class ProgressContext;
+struct ImageCtx;
+
+class AsyncObjectThrottleFinisher {
+public:
+  virtual ~AsyncObjectThrottleFinisher() {};
+  virtual void finish_op(int r) = 0;
+};
+
+template <typename ImageCtxT = ImageCtx>
+class C_AsyncObjectThrottle : public Context {
+public:
+  C_AsyncObjectThrottle(AsyncObjectThrottleFinisher &finisher,
+                        ImageCtxT &image_ctx)
+    : m_image_ctx(image_ctx), m_finisher(finisher) {
+  }
+
+  virtual int send() = 0;
+
+protected:
+  ImageCtxT &m_image_ctx;
+
+  void finish(int r) override {
+    m_finisher.finish_op(r);
+  }
+
+private:
+  AsyncObjectThrottleFinisher &m_finisher;
+};
+
+template <typename ImageCtxT = ImageCtx>
+class AsyncObjectThrottle : public AsyncObjectThrottleFinisher {
+public:
+  typedef boost::function<
+    C_AsyncObjectThrottle<ImageCtxT>* (AsyncObjectThrottle&,
+                                       uint64_t)> ContextFactory;
+
+  AsyncObjectThrottle(const AsyncRequest<ImageCtxT> *async_request,
+                      ImageCtxT &image_ctx,
+                      const ContextFactory& context_factory, Context *ctx,
+		      ProgressContext *prog_ctx, uint64_t object_no,
+		      uint64_t end_object_no);
+
+  void start_ops(uint64_t max_concurrent);
+  void finish_op(int r) override;
+
+private:
+  Mutex m_lock;
+  const AsyncRequest<ImageCtxT> *m_async_request;
+  ImageCtxT &m_image_ctx;
+  ContextFactory m_context_factory;
+  Context *m_ctx;
+  ProgressContext *m_prog_ctx;
+  uint64_t m_object_no;
+  uint64_t m_end_object_no;
+  uint64_t m_current_ops;
+  int m_ret;
+
+  void start_next_op();
+};
+
+} // namespace librbd
+
+extern template class librbd::AsyncObjectThrottle<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_ASYNC_OBJECT_THROTTLE_H