1 files changed, 75 insertions, 0 deletions
diff --git a/src/librbd/watcher/RewatchRequest.h b/src/librbd/watcher/RewatchRequest.h
new file mode 100644
index 000000000..ce5e31539
--- /dev/null
+++ b/src/librbd/watcher/RewatchRequest.h
@@ -0,0 +1,75 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_WATCHER_REWATCH_REQUEST_H
+#define CEPH_LIBRBD_WATCHER_REWATCH_REQUEST_H
+
+#include "common/ceph_mutex.h"
+#include "include/int_types.h"
+#include "include/rados/librados.hpp"
+
+struct Context;
+
+namespace librbd {
+
+namespace watcher {
+
+class RewatchRequest {
+public:
+
+  static RewatchRequest *create(librados::IoCtx& ioctx, const std::string& oid,
+                                ceph::shared_mutex &watch_lock,
+                                librados::WatchCtx2 *watch_ctx,
+                                uint64_t *watch_handle, Context *on_finish) {
+    return new RewatchRequest(ioctx, oid, watch_lock, watch_ctx, watch_handle,
+                              on_finish);
+  }
+
+  RewatchRequest(librados::IoCtx& ioctx, const std::string& oid,
+                 ceph::shared_mutex &watch_lock, librados::WatchCtx2 *watch_ctx,
+                 uint64_t *watch_handle, Context *on_finish);
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * UNWATCH
+   *    |
+   *    |  . . . .
+   *    |  .     . (recoverable error)
+   *    v  v     .
+   * REWATCH . . .
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  librados::IoCtx& m_ioctx;
+  std::string m_oid;
+  ceph::shared_mutex &m_watch_lock;
+  librados::WatchCtx2 *m_watch_ctx;
+  uint64_t *m_watch_handle;
+  Context *m_on_finish;
+
+  uint64_t m_rewatch_handle = 0;
+
+  void unwatch();
+  void handle_unwatch(int r);
+
+  void rewatch();
+  void handle_rewatch(int r);
+
+  void finish(int r);
+};
+
+} // namespace watcher
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_WATCHER_REWATCH_REQUEST_H