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diff --git a/src/ceph/src/tools/rbd_mirror/image_sync/SnapshotCopyRequest.h b/src/ceph/src/tools/rbd_mirror/image_sync/SnapshotCopyRequest.h
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+++ b/src/ceph/src/tools/rbd_mirror/image_sync/SnapshotCopyRequest.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_SNAPSHOT_COPY_REQUEST_H
+#define RBD_MIRROR_IMAGE_SYNC_SNAPSHOT_COPY_REQUEST_H
+
+#include "include/int_types.h"
+#include "include/rados/librados.hpp"
+#include "common/snap_types.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Types.h"
+#include "librbd/journal/TypeTraits.h"
+#include "tools/rbd_mirror/BaseRequest.h"
+#include <map>
+#include <set>
+#include <string>
+#include <tuple>
+
+class Context;
+class ContextWQ;
+namespace journal { class Journaler; }
+namespace librbd { namespace journal { struct MirrorPeerClientMeta; } }
+
+namespace rbd {
+namespace mirror {
+namespace image_sync {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class SnapshotCopyRequest : public BaseRequest {
+public:
+  typedef librbd::journal::TypeTraits<ImageCtxT> TypeTraits;
+  typedef typename TypeTraits::Journaler Journaler;
+
+  typedef std::vector<librados::snap_t> SnapIds;
+  typedef std::map<librados::snap_t, SnapIds> SnapMap;
+
+  static SnapshotCopyRequest* create(ImageCtxT *local_image_ctx,
+                                     ImageCtxT *remote_image_ctx,
+                                     SnapMap *snap_map, Journaler *journaler,
+                                     librbd::journal::MirrorPeerClientMeta *client_meta,
+                                     ContextWQ *work_queue,
+                                     Context *on_finish) {
+    return new SnapshotCopyRequest(local_image_ctx, remote_image_ctx,
+                                   snap_map, journaler, client_meta, work_queue,
+                                   on_finish);
+  }
+
+  SnapshotCopyRequest(ImageCtxT *local_image_ctx, ImageCtxT *remote_image_ctx,
+                      SnapMap *snap_map, Journaler *journaler,
+                      librbd::journal::MirrorPeerClientMeta *client_meta,
+                      ContextWQ *work_queue, Context *on_finish);
+
+  void send() override;
+  void cancel() override;
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    |   /-----------\
+   *    |   |           |
+   *    v   v           | (repeat as needed)
+   * UNPROTECT_SNAP ----/
+   *    |
+   *    |   /-----------\
+   *    |   |           |
+   *    v   v           | (repeat as needed)
+   * REMOVE_SNAP -------/
+   *    |
+   *    |   /-----------\
+   *    |   |           |
+   *    v   v           | (repeat as needed)
+   * CREATE_SNAP -------/
+   *    |
+   *    |   /-----------\
+   *    |   |           |
+   *    v   v           | (repeat as needed)
+   * PROTECT_SNAP ------/
+   *    |
+   *    v
+   * UPDATE_CLIENT
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  typedef std::set<librados::snap_t> SnapIdSet;
+  typedef std::map<librados::snap_t, librados::snap_t> SnapSeqs;
+
+  ImageCtxT *m_local_image_ctx;
+  ImageCtxT *m_remote_image_ctx;
+  SnapMap *m_snap_map;
+  Journaler *m_journaler;
+  librbd::journal::MirrorPeerClientMeta *m_client_meta;
+  ContextWQ *m_work_queue;
+
+  SnapIdSet m_local_snap_ids;
+  SnapIdSet m_remote_snap_ids;
+  SnapSeqs m_snap_seqs;
+  librados::snap_t m_prev_snap_id = CEPH_NOSNAP;
+
+  std::string m_snap_name;
+  cls::rbd::SnapshotNamespace m_snap_namespace;
+
+  librbd::ParentSpec m_local_parent_spec;
+
+  Mutex m_lock;
+  bool m_canceled = false;
+
+  void send_snap_unprotect();
+  void handle_snap_unprotect(int r);
+
+  void send_snap_remove();
+  void handle_snap_remove(int r);
+
+  void send_snap_create();
+  void handle_snap_create(int r);
+
+  void send_snap_protect();
+  void handle_snap_protect(int r);
+
+  void send_update_client();
+  void handle_update_client(int r);
+
+  bool handle_cancellation();
+
+  void error(int r);
+
+  void compute_snap_map();
+
+  int validate_parent(ImageCtxT *image_ctx, librbd::ParentSpec *spec);
+
+  Context *start_local_op();
+
+};
+
+} // namespace image_sync
+} // namespace mirror
+} // namespace rbd
+
+extern template class rbd::mirror::image_sync::SnapshotCopyRequest<librbd::ImageCtx>;
+
+#endif // RBD_MIRROR_IMAGE_SYNC_SNAPSHOT_COPY_REQUEST_H