src/ceph/src/librbd/object_map/LockRequest.h

   1 // -*- mode:C; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_LIBRBD_OBJECT_MAP_LOCK_REQUEST_H
   5 #define CEPH_LIBRBD_OBJECT_MAP_LOCK_REQUEST_H
   6
   7 #include "include/buffer.h"
   8 #include "cls/lock/cls_lock_types.h"
   9 #include <map>
  10
  11 class Context;
  12
  13 namespace librbd {
  14
  15 class ImageCtx;
  16
  17 namespace object_map {
  18
  19 template <typename ImageCtxT = ImageCtx>
  20 class LockRequest {
  21 public:
  22   static LockRequest* create(ImageCtxT &image_ctx, Context *on_finish) {
  23     return new LockRequest(image_ctx, on_finish);
  24   }
  25   LockRequest(ImageCtxT &image_ctx, Context *on_finish);
  26
  27   void send();
  28
  29 private:
  30   /**
  31    * @verbatim
  32    *
  33    * <start>         /------------------------------------- BREAK_LOCKS * * *
  34    *    |            |                                        ^             *
  35    *    |            |                                        |             *
  36    *    |            |                                        |             *
  37    *    |            v   (EBUSY && !broke_lock)               |             *
  38    *    \---------> LOCK_OBJECT_MAP * * * * * * * * * * * > GET_LOCK_INFO * *
  39    *                 |  *       ^                             *             *
  40    *                 |  *       *                             *             *
  41    *                 |  *       *  (ENOENT)                   *             *
  42    *                 |  *       * * * * * * * * * * * * * * * *             *
  43    *                 |  *                                                   *
  44    *                 |  * (other errors)                                    *
  45    *                 |  *                                                   *
  46    *                 v  v                         (other errors)            *
  47    *               <finish> < * * * * * * * * * * * * * * * * * * * * * * * *
  48    *
  49    * @endverbatim
  50    */
  51
  52   ImageCtxT &m_image_ctx;
  53   Context *m_on_finish;
  54
  55   bool m_broke_lock;
  56   std::map<rados::cls::lock::locker_id_t,
  57            rados::cls::lock::locker_info_t> m_lockers;
  58   bufferlist m_out_bl;
  59
  60   void send_lock();
  61   Context *handle_lock(int *ret_val);
  62
  63   void send_get_lock_info();
  64   Context *handle_get_lock_info(int *ret_val);
  65
  66   void send_break_locks();
  67   Context *handle_break_locks(int *ret_val);
  68 };
  69
  70 } // namespace object_map
  71 } // namespace librbd
  72
  73 extern template class librbd::object_map::LockRequest<librbd::ImageCtx>;
  74
  75 #endif // CEPH_LIBRBD_OBJECT_MAP_LOCK_REQUEST_H