1 files changed, 105 insertions, 0 deletions
diff --git a/src/librbd/image/AttachChildRequest.h b/src/librbd/image/AttachChildRequest.h
new file mode 100644
index 000000000..a40afaf54
--- /dev/null
+++ b/src/librbd/image/AttachChildRequest.h
@@ -0,0 +1,105 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IMAGE_ATTACH_CHILD_REQUEST_H
+#define CEPH_LIBRBD_IMAGE_ATTACH_CHILD_REQUEST_H
+
+#include "include/common_fwd.h"
+#include "include/int_types.h"
+#include "include/rados/librados.hpp"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace image {
+
+template <typename ImageCtxT = ImageCtx>
+class AttachChildRequest {
+public:
+  static AttachChildRequest* create(ImageCtxT *image_ctx,
+                                    ImageCtxT *parent_image_ctx,
+                                    const librados::snap_t &parent_snap_id,
+                                    ImageCtxT *old_parent_image_ctx,
+                                    const librados::snap_t &old_parent_snap_id,
+                                    uint32_t clone_format,
+                                    Context* on_finish) {
+      return new AttachChildRequest(image_ctx, parent_image_ctx, parent_snap_id,
+                                    old_parent_image_ctx, old_parent_snap_id,
+                                    clone_format, on_finish);
+  }
+
+  AttachChildRequest(ImageCtxT *image_ctx,
+                     ImageCtxT *parent_image_ctx,
+                     const librados::snap_t &parent_snap_id,
+                     ImageCtxT *old_parent_image_ctx,
+                     const librados::snap_t &old_parent_snap_id,
+                     uint32_t clone_format,
+                     Context* on_finish);
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   *                     <start>
+   *    (clone v1)          |        (clone v2)
+   *      /----------------/ \---------------\
+   *      |                                  |
+   *      v                                  v
+   *  V1 ADD CHILD                       V2 SET CLONE
+   *      |                                  |
+   *      v                                  v
+   *  V1 VALIDATE PROTECTED              V2 ATTACH CHILD
+   *      |                                  |
+   *      |                                  v
+   *  V1 REMOVE CHILD FROM OLD PARENT    V2 DETACH CHILD FROM OLD PARENT
+   *      |                                  |
+   *      \----------------\ /---------------/
+   *                        |
+   *                        v
+   *                     <finish>
+   *
+   * @endverbatim
+   */
+
+  ImageCtxT *m_image_ctx;
+  ImageCtxT *m_parent_image_ctx;
+  librados::snap_t m_parent_snap_id;
+  ImageCtxT *m_old_parent_image_ctx;
+  librados::snap_t m_old_parent_snap_id;
+  uint32_t m_clone_format;
+  Context* m_on_finish;
+
+  CephContext *m_cct;
+
+  void v1_add_child();
+  void handle_v1_add_child(int r);
+
+  void v1_refresh();
+  void handle_v1_refresh(int r);
+
+  void v1_remove_child_from_old_parent();
+  void handle_v1_remove_child_from_old_parent(int r);
+
+  void v2_set_op_feature();
+  void handle_v2_set_op_feature(int r);
+
+  void v2_child_attach();
+  void handle_v2_child_attach(int r);
+
+  void v2_child_detach_from_old_parent();
+  void handle_v2_child_detach_from_old_parent(int r);
+
+  void finish(int r);
+};
+
+} // namespace image
+} // namespace librbd
+
+extern template class librbd::image::AttachChildRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_IMAGE_ATTACH_CHILD_REQUEST_H