ceph/src/librbd/mirror/snapshot/SetImageStateRequest.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_SET_IMAGE_STATE_REQUEST_H
   5 #define CEPH_LIBRBD_MIRROR_SNAPSHOT_SET_IMAGE_STATE_REQUEST_H
   6
   7 #include "librbd/mirror/snapshot/Types.h"
   8
   9 #include <map>
  10 #include <string>
  11
  12 struct Context;
  13
  14 namespace librbd {
  15
  16 struct ImageCtx;
  17
  18 namespace mirror {
  19 namespace snapshot {
  20
  21 template <typename ImageCtxT = librbd::ImageCtx>
  22 class SetImageStateRequest {
  23 public:
  24   static SetImageStateRequest *create(ImageCtxT *image_ctx, uint64_t snap_id,
  25                                       Context *on_finish) {
  26     return new SetImageStateRequest(image_ctx, snap_id, on_finish);
  27   }
  28
  29   SetImageStateRequest(ImageCtxT *image_ctx, uint64_t snap_id,
  30                        Context *on_finish)
  31     : m_image_ctx(image_ctx), m_snap_id(snap_id), m_on_finish(on_finish) {
  32   }
  33
  34   void send();
  35
  36 private:
  37   /**
  38    * @verbatim
  39    *
  40    * <start>
  41    *    |
  42    *    v
  43    * GET_SNAP_LIMIT
  44    *    |
  45    *    v
  46    * GET_METADATA
  47    *    |
  48    *    v
  49    * WRITE_IMAGE_STATE
  50    *    |
  51    *    v
  52    * UPDATE_PRIMARY_SNAPSHOT
  53    *    |
  54    *    v
  55    * <finish>
  56    *
  57    * @endverbatim
  58    */
  59
  60   ImageCtxT *m_image_ctx;
  61   uint64_t m_snap_id;
  62   Context *m_on_finish;
  63
  64   ImageState m_image_state;
  65
  66   bufferlist m_bl;
  67   bufferlist m_state_bl;
  68
  69   void get_snap_limit();
  70   void handle_get_snap_limit(int r);
  71
  72   void get_metadata();
  73   void handle_get_metadata(int r);
  74
  75   void write_image_state();
  76   void handle_write_image_state(int r);
  77
  78   void update_primary_snapshot();
  79   void handle_update_primary_snapshot(int r);
  80
  81   void finish(int r);
  82 };
  83
  84 } // namespace snapshot
  85 } // namespace mirror
  86 } // namespace librbd
  87
  88 extern template class librbd::mirror::snapshot::SetImageStateRequest<librbd::ImageCtx>;
  89
  90 #endif // CEPH_LIBRBD_MIRROR_SNAPSHOT_SET_IMAGE_STATE_REQUEST_H