src/ceph/src/librbd/object_map/RefreshRequest.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_REFRESH_REQUEST_H
   5 #define CEPH_LIBRBD_OBJECT_MAP_REFRESH_REQUEST_H
   6
   7 #include "include/int_types.h"
   8 #include "include/buffer.h"
   9 #include "common/bit_vector.hpp"
  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 RefreshRequest {
  21 public:
  22   static RefreshRequest *create(ImageCtxT &image_ctx,
  23                                 ceph::BitVector<2> *object_map,
  24                                 uint64_t snap_id, Context *on_finish) {
  25     return new RefreshRequest(image_ctx, object_map, snap_id, on_finish);
  26   }
  27
  28   RefreshRequest(ImageCtxT &image_ctx, ceph::BitVector<2> *object_map,
  29                  uint64_t snap_id, Context *on_finish);
  30
  31   void send();
  32
  33 private:
  34   /**
  35    * @verbatim
  36    *
  37    * <start> -----> LOCK (skip if snapshot)
  38    *    *             |
  39    *    *             v  (other errors)
  40    *    *           LOAD * * * * * * * > INVALIDATE ------------\
  41    *    *             |    *                                    |
  42    *    *             |    * (-EINVAL or too small)             |
  43    *    *             |    * * * * * * > INVALIDATE_AND_RESIZE  |
  44    *    *             |                      |              *   |
  45    *    *             |                      |              *   |
  46    *    *             |                      v              *   |
  47    *    *             |                    RESIZE           *   |
  48    *    *             |                      |              *   |
  49    *    *             |                      |  * * * * * * *   |
  50    *    *             |                      |  *               |
  51    *    *             |                      v  v               |
  52    *    *             \--------------------> LOCK <-------------/
  53    *    *                                     |
  54    *    v                                     v
  55    * INVALIDATE_AND_CLOSE ---------------> <finish>
  56    *
  57    * @endverbatim
  58    */
  59
  60   ImageCtxT &m_image_ctx;
  61   ceph::BitVector<2> *m_object_map;
  62   uint64_t m_snap_id;
  63   Context *m_on_finish;
  64
  65   uint64_t m_object_count;
  66   ceph::BitVector<2> m_on_disk_object_map;
  67   bool m_truncate_on_disk_object_map;
  68   bufferlist m_out_bl;
  69
  70   void send_lock();
  71   Context *handle_lock(int *ret_val);
  72
  73   void send_load();
  74   Context *handle_load(int *ret_val);
  75
  76   void send_invalidate();
  77   Context *handle_invalidate(int *ret_val);
  78
  79   void send_resize_invalidate();
  80   Context *handle_resize_invalidate(int *ret_val);
  81
  82   void send_resize();
  83   Context *handle_resize(int *ret_val);
  84
  85   void send_invalidate_and_close();
  86   Context *handle_invalidate_and_close(int *ret_val);
  87
  88   void apply();
  89 };
  90
  91 } // namespace object_map
  92 } // namespace librbd
  93
  94 extern template class librbd::object_map::RefreshRequest<librbd::ImageCtx>;
  95
  96 #endif // CEPH_LIBRBD_OBJECT_MAP_REFRESH_REQUEST_H