ceph/src/librbd/mirror/snapshot/RemoveImageStateRequest.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_MIRROR_SNAPSHOT_REMOVE_IMAGE_STATE_REQUEST_H
   5 #define CEPH_LIBRBD_MIRROR_SNAPSHOT_REMOVE_IMAGE_STATE_REQUEST_H
   6
   7 #include "include/buffer.h"
   8 #include "include/types.h"
   9
  10 struct Context;
  11
  12 namespace librbd {
  13
  14 struct ImageCtx;
  15
  16 namespace mirror {
  17 namespace snapshot {
  18
  19 template <typename ImageCtxT = librbd::ImageCtx>
  20 class RemoveImageStateRequest {
  21 public:
  22   static RemoveImageStateRequest *create(ImageCtxT *image_ctx, uint64_t snap_id,
  23                                          Context *on_finish) {
  24       return new RemoveImageStateRequest(image_ctx, snap_id, on_finish);
  25   }
  26
  27   RemoveImageStateRequest(ImageCtxT *image_ctx, uint64_t snap_id,
  28                           Context *on_finish)
  29     : m_image_ctx(image_ctx), m_snap_id(snap_id), m_on_finish(on_finish) {
  30   }
  31
  32   void send();
  33
  34 private:
  35   /**
  36    * @verbatim
  37    *
  38    * <start>
  39    *    |
  40    *    v
  41    * GET_OBJECT_COUNT
  42    *    |
  43    *    v
  44    * REMOVE_OBJECT (repeat for
  45    *    |           every object)
  46    *    v
  47    * <finish>
  48    *
  49    * @endverbatim
  50    */
  51
  52   ImageCtxT *m_image_ctx;
  53   uint64_t m_snap_id;
  54   Context *m_on_finish;
  55
  56   bufferlist m_bl;
  57
  58   size_t m_object_count = 0;
  59
  60   void get_object_count();
  61   void handle_get_object_count(int r);
  62
  63   void remove_object();
  64   void handle_remove_object(int r);
  65
  66   void finish(int r);
  67 };
  68
  69 } // namespace snapshot
  70 } // namespace mirror
  71 } // namespace librbd
  72
  73 extern template class librbd::mirror::snapshot::RemoveImageStateRequest<librbd::ImageCtx>;
  74
  75 #endif // CEPH_LIBRBD_MIRROR_SNAPSHOT_REMOVE_IMAGE_STATE_REQUEST_H