initial code repo

[stor4nfv.git] / src / ceph / src / librbd / object_map / LockRequest.h

diff --git a/src/ceph/src/librbd/object_map/LockRequest.h b/src/ceph/src/librbd/object_map/LockRequest.h
new file mode 100644 (file)
index 0000000..0333548
--- /dev/null
+++ b/src/ceph/src/librbd/object_map/LockRequest.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_OBJECT_MAP_LOCK_REQUEST_H
+#define CEPH_LIBRBD_OBJECT_MAP_LOCK_REQUEST_H
+
+#include "include/buffer.h"
+#include "cls/lock/cls_lock_types.h"
+#include <map>
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace object_map {
+
+template <typename ImageCtxT = ImageCtx>
+class LockRequest {
+public:
+  static LockRequest* create(ImageCtxT &image_ctx, Context *on_finish) {
+    return new LockRequest(image_ctx, on_finish);
+  }
+  LockRequest(ImageCtxT &image_ctx, Context *on_finish);
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>         /------------------------------------- BREAK_LOCKS * * *
+   *    |            |                                        ^             *
+   *    |            |                                        |             *
+   *    |            |                                        |             *
+   *    |            v   (EBUSY && !broke_lock)               |             *
+   *    \---------> LOCK_OBJECT_MAP * * * * * * * * * * * > GET_LOCK_INFO * *
+   *                 |  *       ^                             *             *
+   *                 |  *       *                             *             *
+   *                 |  *       *  (ENOENT)                   *             *
+   *                 |  *       * * * * * * * * * * * * * * * *             *
+   *                 |  *                                                   *
+   *                 |  * (other errors)                                    *
+   *                 |  *                                                   *
+   *                 v  v                         (other errors)            *
+   *               <finish> < * * * * * * * * * * * * * * * * * * * * * * * *
+   *
+   * @endverbatim
+   */
+
+  ImageCtxT &m_image_ctx;
+  Context *m_on_finish;
+
+  bool m_broke_lock;
+  std::map<rados::cls::lock::locker_id_t,
+           rados::cls::lock::locker_info_t> m_lockers;
+  bufferlist m_out_bl;
+
+  void send_lock();
+  Context *handle_lock(int *ret_val);
+
+  void send_get_lock_info();
+  Context *handle_get_lock_info(int *ret_val);
+
+  void send_break_locks();
+  Context *handle_break_locks(int *ret_val);
+};
+
+} // namespace object_map
+} // namespace librbd
+
+extern template class librbd::object_map::LockRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_OBJECT_MAP_LOCK_REQUEST_H