src/ceph/src/tools/rbd_mirror/image_replayer/OpenLocalImageRequest.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 RBD_MIRROR_IMAGE_REPLAYER_OPEN_LOCAL_IMAGE_REQUEST_H
   5 #define RBD_MIRROR_IMAGE_REPLAYER_OPEN_LOCAL_IMAGE_REQUEST_H
   6
   7 #include "include/int_types.h"
   8 #include "librbd/ImageCtx.h"
   9 #include <string>
  10
  11 class Context;
  12 class ContextWQ;
  13 namespace librbd { class ImageCtx; }
  14
  15 namespace rbd {
  16 namespace mirror {
  17 namespace image_replayer {
  18
  19 template <typename ImageCtxT = librbd::ImageCtx>
  20 class OpenLocalImageRequest {
  21 public:
  22   static OpenLocalImageRequest* create(librados::IoCtx &local_io_ctx,
  23                                        ImageCtxT **local_image_ctx,
  24                                        const std::string &local_image_id,
  25                                        ContextWQ *work_queue,
  26                                        Context *on_finish) {
  27     return new OpenLocalImageRequest(local_io_ctx, local_image_ctx,
  28                                      local_image_id, work_queue, on_finish);
  29   }
  30
  31   OpenLocalImageRequest(librados::IoCtx &local_io_ctx,
  32                         ImageCtxT **local_image_ctx,
  33                         const std::string &local_image_id,
  34                         ContextWQ *m_work_queue,
  35                         Context *on_finish);
  36
  37   void send();
  38
  39 private:
  40   /**
  41    * @verbatim
  42    *
  43    * <start>
  44    *    |
  45    *    v
  46    * OPEN_IMAGE * * * * * * * *
  47    *    |                     *
  48    *    v                     *
  49    * IS_PRIMARY * * * * * * * *
  50    *    |                     *
  51    *    v (skip if primary)   v
  52    * LOCK_IMAGE * * * > CLOSE_IMAGE
  53    *    |                     |
  54    *    v                     |
  55    * <finish> <---------------/
  56    *
  57    * @endverbatim
  58    */
  59   librados::IoCtx &m_local_io_ctx;
  60   ImageCtxT **m_local_image_ctx;
  61   std::string m_local_image_id;
  62   ContextWQ *m_work_queue;
  63   Context *m_on_finish;
  64
  65   bool m_primary = false;
  66   int m_ret_val = 0;
  67
  68   void send_open_image();
  69   void handle_open_image(int r);
  70
  71   void send_is_primary();
  72   void handle_is_primary(int r);
  73
  74   void send_lock_image();
  75   void handle_lock_image(int r);
  76
  77   void send_close_image(int r);
  78   void handle_close_image(int r);
  79
  80   void finish(int r);
  81
  82 };
  83
  84 } // namespace image_replayer
  85 } // namespace mirror
  86 } // namespace rbd
  87
  88 extern template class rbd::mirror::image_replayer::OpenLocalImageRequest<librbd::ImageCtx>;
  89
  90 #endif // RBD_MIRROR_IMAGE_REPLAYER_OPEN_LOCAL_IMAGE_REQUEST_H