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diff --git a/src/ceph/src/tools/rbd_mirror/image_sync/ObjectCopyRequest.h b/src/ceph/src/tools/rbd_mirror/image_sync/ObjectCopyRequest.h
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+++ b/src/ceph/src/tools/rbd_mirror/image_sync/ObjectCopyRequest.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef RBD_MIRROR_IMAGE_SYNC_OBJECT_COPY_REQUEST_H
+#define RBD_MIRROR_IMAGE_SYNC_OBJECT_COPY_REQUEST_H
+
+#include "include/int_types.h"
+#include "include/rados/librados.hpp"
+#include "common/snap_types.h"
+#include "librbd/ImageCtx.h"
+#include <list>
+#include <map>
+#include <string>
+#include <vector>
+
+class Context;
+class RWLock;
+
+namespace rbd {
+namespace mirror {
+namespace image_sync {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class ObjectCopyRequest {
+public:
+  typedef std::vector<librados::snap_t> SnapIds;
+  typedef std::map<librados::snap_t, SnapIds> SnapMap;
+
+  static ObjectCopyRequest* create(ImageCtxT *local_image_ctx,
+                                   ImageCtxT *remote_image_ctx,
+                                   const SnapMap *snap_map,
+                                   uint64_t object_number, Context *on_finish) {
+    return new ObjectCopyRequest(local_image_ctx, remote_image_ctx, snap_map,
+                                 object_number, on_finish);
+  }
+
+  ObjectCopyRequest(ImageCtxT *local_image_ctx, ImageCtxT *remote_image_ctx,
+                    const SnapMap *snap_map, uint64_t object_number,
+                    Context *on_finish);
+
+  void send();
+
+  // testing support
+  inline librados::IoCtx &get_local_io_ctx() {
+    return m_local_io_ctx;
+  }
+  inline librados::IoCtx &get_remote_io_ctx() {
+    return m_remote_io_ctx;
+  }
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * LIST_SNAPS < * * *
+   *    |             * (-ENOENT and snap set stale)
+   *    |   * * * * * *
+   *    |   *
+   *    v   *
+   * READ_OBJECT <--------\
+   *    |                 | (repeat for each snapshot)
+   *    v                 |
+   * WRITE_OBJECT --------/
+   *    |
+   *    |     /-----------\
+   *    |     |           | (repeat for each snapshot)
+   *    v     v           |
+   * UPDATE_OBJECT_MAP ---/ (skip if object
+   *    |                    map disabled)
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  enum SyncOpType {
+    SYNC_OP_TYPE_WRITE,
+    SYNC_OP_TYPE_TRUNC,
+    SYNC_OP_TYPE_REMOVE
+  };
+
+  typedef std::map<uint64_t, uint64_t> ExtentMap;
+
+  struct SyncOp {
+    SyncOp(SyncOpType type, uint64_t offset, uint64_t length)
+      : type(type), offset(offset), length(length) {
+    }
+
+    SyncOpType type;
+    uint64_t offset;
+    uint64_t length;
+
+    ExtentMap extent_map;
+    bufferlist out_bl;
+  };
+
+  typedef std::list<SyncOp> SyncOps;
+  typedef std::pair<librados::snap_t, librados::snap_t> WriteReadSnapIds;
+  typedef std::map<WriteReadSnapIds, SyncOps> SnapSyncOps;
+  typedef std::map<librados::snap_t, uint8_t> SnapObjectStates;
+  typedef std::map<librados::snap_t, uint64_t> SnapObjectSizes;
+
+  ImageCtxT *m_local_image_ctx;
+  ImageCtxT *m_remote_image_ctx;
+  const SnapMap *m_snap_map;
+  uint64_t m_object_number;
+  Context *m_on_finish;
+
+  decltype(m_local_image_ctx->data_ctx) m_local_io_ctx;
+  decltype(m_remote_image_ctx->data_ctx) m_remote_io_ctx;
+  std::string m_local_oid;
+  std::string m_remote_oid;
+
+  librados::snap_set_t m_snap_set;
+  int m_snap_ret;
+
+  bool m_retry_missing_read = false;
+  librados::snap_set_t m_retry_snap_set;
+
+  SnapSyncOps m_snap_sync_ops;
+  SnapObjectStates m_snap_object_states;
+  SnapObjectSizes m_snap_object_sizes;
+
+  void send_list_snaps();
+  void handle_list_snaps(int r);
+
+  void send_read_object();
+  void handle_read_object(int r);
+
+  void send_write_object();
+  void handle_write_object(int r);
+
+  void send_update_object_map();
+  void handle_update_object_map(int r);
+
+  Context *start_local_op(RWLock &owner_lock);
+
+  void compute_diffs();
+  void finish(int r);
+
+};
+
+} // namespace image_sync
+} // namespace mirror
+} // namespace rbd
+
+extern template class rbd::mirror::image_sync::ObjectCopyRequest<librbd::ImageCtx>;
+
+#endif // RBD_MIRROR_IMAGE_SYNC_OBJECT_COPY_REQUEST_H