initial code repo

[stor4nfv.git] / src / ceph / src / librbd / image / RefreshParentRequest.h

diff --git a/src/ceph/src/librbd/image/RefreshParentRequest.h b/src/ceph/src/librbd/image/RefreshParentRequest.h
new file mode 100644 (file)
index 0000000..ed65b9a
--- /dev/null
+++ b/src/ceph/src/librbd/image/RefreshParentRequest.h
@@ -0,0 +1,99 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IMAGE_REFRESH_PARENT_REQUEST_H
+#define CEPH_LIBRBD_IMAGE_REFRESH_PARENT_REQUEST_H
+
+#include "include/int_types.h"
+#include "librbd/Types.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace image {
+
+template <typename ImageCtxT = ImageCtx>
+class RefreshParentRequest {
+public:
+  static RefreshParentRequest *create(ImageCtxT &child_image_ctx,
+                                      const ParentInfo &parent_md,
+                                      Context *on_finish) {
+    return new RefreshParentRequest(child_image_ctx, parent_md, on_finish);
+  }
+
+  static bool is_refresh_required(ImageCtxT &child_image_ctx,
+                                  const ParentInfo &parent_md);
+
+  void send();
+  void apply();
+  void finalize(Context *on_finish);
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    | (open required)
+   *    |----------------> OPEN_PARENT * * * * * * * * * * * * * * *
+   *    |                     |                                    *
+   *    |                     v                                    *
+   *    |                  SET_PARENT_SNAP * * * * * *             *
+   *    |                     |                      *             *
+   *    |                     v                      * (on error)  *
+   *    \----------------> <apply>                   *             *
+   *                          |                      *             *
+   *                          | (close required)     v             *
+   *                          |-----------------> CLOSE_PARENT     *
+   *                          |                      |             *
+   *                          |                      v             *
+   *                          \-----------------> <finish> < * * * *
+   *
+   * @endverbatim
+   */
+
+  RefreshParentRequest(ImageCtxT &child_image_ctx, const ParentInfo &parent_md,
+                       Context *on_finish);
+
+  ImageCtxT &m_child_image_ctx;
+  ParentInfo m_parent_md;
+  Context *m_on_finish;
+
+  ImageCtxT *m_parent_image_ctx;
+  uint64_t m_parent_snap_id;
+
+  int m_error_result;
+
+  static bool is_close_required(ImageCtxT &child_image_ctx,
+                                const ParentInfo &parent_md);
+  static bool is_open_required(ImageCtxT &child_image_ctx,
+                               const ParentInfo &parent_md);
+
+  void send_open_parent();
+  Context *handle_open_parent(int *result);
+
+  void send_set_parent_snap();
+  Context *handle_set_parent_snap(int *result);
+
+  void send_close_parent();
+  Context *handle_close_parent(int *result);
+
+  void send_complete(int r);
+
+  void save_result(int *result) {
+    if (m_error_result == 0 && *result < 0) {
+      m_error_result = *result;
+    }
+  }
+
+};
+
+} // namespace image
+} // namespace librbd
+
+extern template class librbd::image::RefreshParentRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_IMAGE_REFRESH_PARENT_REQUEST_H