1 files changed, 107 insertions, 0 deletions
diff --git a/src/librbd/journal/DemoteRequest.h b/src/librbd/journal/DemoteRequest.h
new file mode 100644
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+++ b/src/librbd/journal/DemoteRequest.h
@@ -0,0 +1,107 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
+#define CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
+
+#include "common/Mutex.h"
+#include "cls/journal/cls_journal_types.h"
+#include "journal/Future.h"
+#include "librbd/journal/Types.h"
+#include "librbd/journal/TypeTraits.h"
+
+struct Context;
+
+namespace librbd {
+
+struct ImageCtx;
+
+namespace journal {
+
+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);
+  ~DemoteRequest();
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * OPEN_JOURNALER * * * * *
+   *    |                   *
+   *    v                   *
+   * ALLOCATE_TAG * * * * * *
+   *    |                   *
+   *    v                   *
+   * APPEND_EVENT * * *     *
+   *    |             *     *
+   *    v             *     *
+   * COMMIT_EVENT     *     *
+   *    |             *     *
+   *    v             *     *
+   * STOP_APPEND <* * *     *
+   *    |                   *
+   *    v                   *
+   * SHUT_DOWN_JOURNALER <* *
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  typedef typename TypeTraits<ImageCtxT>::Journaler Journaler;
+  typedef typename TypeTraits<ImageCtxT>::Future Future;
+
+  ImageCtxT &m_image_ctx;
+  Context *m_on_finish;
+
+  Journaler *m_journaler = nullptr;
+  int m_ret_val = 0;
+
+  Mutex m_lock;
+  ImageClientMeta m_client_meta;
+  uint64_t m_tag_tid = 0;
+  TagData m_tag_data;
+
+  cls::journal::Tag m_tag;
+  Future m_future;
+
+  void open_journaler();
+  void handle_open_journaler(int r);
+
+  void allocate_tag();
+  void handle_allocate_tag(int r);
+
+  void append_event();
+  void handle_append_event(int r);
+
+  void commit_event();
+  void handle_commit_event(int r);
+
+  void stop_append();
+  void handle_stop_append(int r);
+
+  void shut_down_journaler();
+  void handle_shut_down_journaler(int r);
+
+  void finish(int r);
+
+};
+
+} // namespace journal
+} // namespace librbd
+
+extern template class librbd::journal::DemoteRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H