src/ceph/src/librbd/image/RefreshParentRequest.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_IMAGE_REFRESH_PARENT_REQUEST_H
   5 #define CEPH_LIBRBD_IMAGE_REFRESH_PARENT_REQUEST_H
   6
   7 #include "include/int_types.h"
   8 #include "librbd/Types.h"
   9
  10 class Context;
  11
  12 namespace librbd {
  13
  14 class ImageCtx;
  15
  16 namespace image {
  17
  18 template <typename ImageCtxT = ImageCtx>
  19 class RefreshParentRequest {
  20 public:
  21   static RefreshParentRequest *create(ImageCtxT &child_image_ctx,
  22                                       const ParentInfo &parent_md,
  23                                       Context *on_finish) {
  24     return new RefreshParentRequest(child_image_ctx, parent_md, on_finish);
  25   }
  26
  27   static bool is_refresh_required(ImageCtxT &child_image_ctx,
  28                                   const ParentInfo &parent_md);
  29
  30   void send();
  31   void apply();
  32   void finalize(Context *on_finish);
  33
  34 private:
  35   /**
  36    * @verbatim
  37    *
  38    * <start>
  39    *    |
  40    *    | (open required)
  41    *    |----------------> OPEN_PARENT * * * * * * * * * * * * * * *
  42    *    |                     |                                    *
  43    *    |                     v                                    *
  44    *    |                  SET_PARENT_SNAP * * * * * *             *
  45    *    |                     |                      *             *
  46    *    |                     v                      * (on error)  *
  47    *    \----------------> <apply>                   *             *
  48    *                          |                      *             *
  49    *                          | (close required)     v             *
  50    *                          |-----------------> CLOSE_PARENT     *
  51    *                          |                      |             *
  52    *                          |                      v             *
  53    *                          \-----------------> <finish> < * * * *
  54    *
  55    * @endverbatim
  56    */
  57
  58   RefreshParentRequest(ImageCtxT &child_image_ctx, const ParentInfo &parent_md,
  59                        Context *on_finish);
  60
  61   ImageCtxT &m_child_image_ctx;
  62   ParentInfo m_parent_md;
  63   Context *m_on_finish;
  64
  65   ImageCtxT *m_parent_image_ctx;
  66   uint64_t m_parent_snap_id;
  67
  68   int m_error_result;
  69
  70   static bool is_close_required(ImageCtxT &child_image_ctx,
  71                                 const ParentInfo &parent_md);
  72   static bool is_open_required(ImageCtxT &child_image_ctx,
  73                                const ParentInfo &parent_md);
  74
  75   void send_open_parent();
  76   Context *handle_open_parent(int *result);
  77
  78   void send_set_parent_snap();
  79   Context *handle_set_parent_snap(int *result);
  80
  81   void send_close_parent();
  82   Context *handle_close_parent(int *result);
  83
  84   void send_complete(int r);
  85
  86   void save_result(int *result) {
  87     if (m_error_result == 0 && *result < 0) {
  88       m_error_result = *result;
  89     }
  90   }
  91
  92 };
  93
  94 } // namespace image
  95 } // namespace librbd
  96
  97 extern template class librbd::image::RefreshParentRequest<librbd::ImageCtx>;
  98
  99 #endif // CEPH_LIBRBD_IMAGE_REFRESH_PARENT_REQUEST_H