1 files changed, 119 insertions, 0 deletions
diff --git a/src/librbd/image/DetachChildRequest.h b/src/librbd/image/DetachChildRequest.h
new file mode 100644
index 000000000..646b7ec62
--- /dev/null
+++ b/src/librbd/image/DetachChildRequest.h
@@ -0,0 +1,119 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IMAGE_DETACH_CHILD_REQUEST_H
+#define CEPH_LIBRBD_IMAGE_DETACH_CHILD_REQUEST_H
+
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "include/rados/librados.hpp"
+#include "librbd/Types.h"
+#include "librbd/internal.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace image {
+
+template <typename ImageCtxT = ImageCtx>
+class DetachChildRequest {
+public:
+  static DetachChildRequest* create(ImageCtxT& image_ctx, Context* on_finish) {
+    return new DetachChildRequest(image_ctx, on_finish);
+  }
+
+  DetachChildRequest(ImageCtxT& image_ctx, Context* on_finish)
+    : m_image_ctx(image_ctx), m_on_finish(on_finish) {
+  }
+  ~DetachChildRequest();
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   *                 <start>
+   *                    |
+   *     (v1)           | (v2)
+   *    /--------------/ \--------------\
+   *    |                               |
+   *    v                               v
+   * REMOVE_CHILD                   CHILD_DETACH
+   *    |                               |
+   *    |                               v
+   *    |                           GET_SNAPSHOT
+   *    |  (snapshot in-use)          . |
+   *    |/. . . . . . . . . . . . . . . |
+   *    |                               v
+   *    |                           OPEN_PARENT
+   *    |                               |
+   *    |                               v           (has more children)
+   *    |                           REMOVE_SNAPSHOT ---------------\
+   *    |                               |                          |
+   *    |                               v                  (noent) |
+   *    |     (auto-delete when     GET_PARENT_TRASH_ENTRY . . . .\|
+   *    |      last child detached)     |                          |
+   *    |                               v                          v
+   *    |                           REMOVE_PARENT_FROM_TRASH   CLOSE_PARENT
+   *    |                               |                          |
+   *    |/------------------------------/--------------------------/
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  ImageCtxT& m_image_ctx;
+  Context* m_on_finish;
+
+  librados::IoCtx m_parent_io_ctx;
+  cls::rbd::ParentImageSpec m_parent_spec;
+  std::string m_parent_header_name;
+
+  cls::rbd::SnapshotNamespace m_parent_snap_namespace;
+  std::string m_parent_snap_name;
+
+  ImageCtxT* m_parent_image_ctx = nullptr;
+
+  ceph::bufferlist m_out_bl;
+  NoOpProgressContext m_no_op;
+
+  void clone_v2_child_detach();
+  void handle_clone_v2_child_detach(int r);
+
+  void clone_v2_get_snapshot();
+  void handle_clone_v2_get_snapshot(int r);
+
+  void clone_v2_open_parent();
+  void handle_clone_v2_open_parent(int r);
+
+  void clone_v2_remove_snapshot();
+  void handle_clone_v2_remove_snapshot(int r);
+
+  void clone_v2_get_parent_trash_entry();
+  void handle_clone_v2_get_parent_trash_entry(int r);
+
+  void clone_v2_remove_parent_from_trash();
+  void handle_clone_v2_remove_parent_from_trash(int r);
+
+  void clone_v2_close_parent();
+  void handle_clone_v2_close_parent(int r);
+
+  void clone_v1_remove_child();
+  void handle_clone_v1_remove_child(int r);
+
+  void finish(int r);
+
+};
+
+} // namespace image
+} // namespace librbd
+
+extern template class librbd::image::DetachChildRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_IMAGE_DETACH_CHILD_REQUEST_H