initial code repo

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

diff --git a/src/ceph/src/librbd/image/CloseRequest.h b/src/ceph/src/librbd/image/CloseRequest.h
new file mode 100644 (file)
index 0000000..812e91d
--- /dev/null
+++ b/src/ceph/src/librbd/image/CloseRequest.h
@@ -0,0 +1,126 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_IMAGE_CLOSE_REQUEST_H
+#define CEPH_LIBRBD_IMAGE_CLOSE_REQUEST_H
+
+#include "librbd/ImageCtx.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace image {
+
+template <typename ImageCtxT = ImageCtx>
+class CloseRequest {
+public:
+  static CloseRequest *create(ImageCtxT *image_ctx, Context *on_finish) {
+    return new CloseRequest(image_ctx, on_finish);
+  }
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * BLOCK_IMAGE_WATCHER (skip if R/O)
+   *    |
+   *    v
+   * SHUT_DOWN_UPDATE_WATCHERS
+   *    |
+   *    v
+   * SHUT_DOWN_AIO_WORK_QUEUE . . .
+   *    |                         . (exclusive lock disabled)
+   *    v                         v
+   * SHUT_DOWN_EXCLUSIVE_LOCK   FLUSH
+   *    |                         .
+   *    |     . . . . . . . . . . .
+   *    |     .
+   *    v     v
+   * UNREGISTER_IMAGE_WATCHER (skip if R/O)
+   *    |
+   *    v
+   * FLUSH_READAHEAD
+   *    |
+   *    v
+   * SHUTDOWN_CACHE
+   *    |
+   *    v
+   * FLUSH_OP_WORK_QUEUE . . . . .
+   *    |                        .
+   *    v                        .
+   * CLOSE_PARENT                . (no parent)
+   *    |                        .
+   *    v                        .
+   * FLUSH_IMAGE_WATCHER < . . . .
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  CloseRequest(ImageCtxT *image_ctx, Context *on_finish);
+
+  ImageCtxT *m_image_ctx;
+  Context *m_on_finish;
+
+  int m_error_result;
+
+  decltype(m_image_ctx->exclusive_lock) m_exclusive_lock;
+
+  void send_block_image_watcher();
+  void handle_block_image_watcher(int r);
+
+  void send_shut_down_update_watchers();
+  void handle_shut_down_update_watchers(int r);
+
+  void send_shut_down_io_queue();
+  void handle_shut_down_io_queue(int r);
+
+  void send_shut_down_exclusive_lock();
+  void handle_shut_down_exclusive_lock(int r);
+
+  void send_flush();
+  void handle_flush(int r);
+
+  void send_unregister_image_watcher();
+  void handle_unregister_image_watcher(int r);
+
+  void send_flush_readahead();
+  void handle_flush_readahead(int r);
+
+  void send_shut_down_cache();
+  void handle_shut_down_cache(int r);
+
+  void send_flush_op_work_queue();
+  void handle_flush_op_work_queue(int r);
+
+  void send_close_parent();
+  void handle_close_parent(int r);
+
+  void send_flush_image_watcher();
+  void handle_flush_image_watcher(int r);
+
+  void finish();
+
+  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::CloseRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_IMAGE_CLOSE_REQUEST_H