initial code repo

[stor4nfv.git] / src / ceph / src / librbd / mirror / DemoteRequest.h

diff --git a/src/ceph/src/librbd/mirror/DemoteRequest.h b/src/ceph/src/librbd/mirror/DemoteRequest.h
new file mode 100644 (file)
index 0000000..a4f6f0c
--- /dev/null
+++ b/src/ceph/src/librbd/mirror/DemoteRequest.h
@@ -0,0 +1,85 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H
+#define CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H
+
+#include "cls/rbd/cls_rbd_types.h"
+#include "librbd/mirror/Types.h"
+
+struct Context;
+
+namespace librbd {
+
+struct ImageCtx;
+
+namespace mirror {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class DemoteRequest {
+public:
+  static DemoteRequest *create(ImageCtxT &image_ctx, Context *on_finish) {
+    return new DemoteRequest(image_ctx, on_finish);
+  }
+
+  DemoteRequest(ImageCtxT &image_ctx, Context *on_finish)
+    : m_image_ctx(image_ctx), m_on_finish(on_finish) {
+  }
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * GET_INFO
+   *    |
+   *    v
+   * ACQUIRE_LOCK * * * *
+   *    |               *
+   *    v               *
+   * DEMOTE             *
+   *    |               *
+   *    v               *
+   * RELEASE_LOCK       *
+   *    |               *
+   *    v               *
+   * <finish> < * * * * *
+   *
+   * @endverbatim
+   */
+
+  ImageCtxT &m_image_ctx;
+  Context *m_on_finish;
+
+  int m_ret_val = 0;
+  bool m_blocked_requests = false;
+
+  cls::rbd::MirrorImage m_mirror_image;
+  PromotionState m_promotion_state;
+
+  void get_info();
+  void handle_get_info(int r);
+
+  void acquire_lock();
+  void handle_acquire_lock(int r);
+
+  void demote();
+  void handle_demote(int r);
+
+  void release_lock();
+  void handle_release_lock(int r);
+
+  void finish(int r);
+
+};
+
+} // namespace mirror
+} // namespace librbd
+
+extern template class librbd::mirror::DemoteRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H