ceph/src/tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h"
   5 #include "include/rados/librados.hpp"
   6 #include "cls/rbd/cls_rbd_client.h"
   7 #include "common/errno.h"
   8 #include "librbd/ImageCtx.h"
   9 #include "librbd/Utils.h"
  10
  11 #define dout_context g_ceph_context
  12 #define dout_subsys ceph_subsys_rbd_mirror
  13 #undef dout_prefix
  14 #define dout_prefix *_dout << "rbd::mirror::image_replayer::" \
  15                            << "GetMirrorImageIdRequest: " << this << " " \
  16                            << __func__ << ": "
  17
  18 namespace rbd {
  19 namespace mirror {
  20 namespace image_replayer {
  21
  22 using librbd::util::create_rados_callback;
  23
  24 template <typename I>
  25 void GetMirrorImageIdRequest<I>::send() {
  26   dout(20) << dendl;
  27   get_image_id();
  28 }
  29
  30 template <typename I>
  31 void GetMirrorImageIdRequest<I>::get_image_id() {
  32   dout(20) << dendl;
  33
  34   // attempt to cross-reference a image id by the global image id
  35   librados::ObjectReadOperation op;
  36   librbd::cls_client::mirror_image_get_image_id_start(&op, m_global_image_id);
  37
  38   librados::AioCompletion *aio_comp = create_rados_callback<
  39     GetMirrorImageIdRequest<I>,
  40     &GetMirrorImageIdRequest<I>::handle_get_image_id>(
  41       this);
  42   int r = m_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
  43   assert(r == 0);
  44   aio_comp->release();
  45 }
  46
  47 template <typename I>
  48 void GetMirrorImageIdRequest<I>::handle_get_image_id(int r) {
  49   if (r == 0) {
  50     bufferlist::iterator iter = m_out_bl.begin();
  51     r = librbd::cls_client::mirror_image_get_image_id_finish(
  52       &iter, m_image_id);
  53   }
  54
  55   dout(20) << "r=" << r << ", "
  56            << "image_id=" << *m_image_id << dendl;
  57
  58   if (r < 0) {
  59     if (r == -ENOENT) {
  60       dout(10) << "global image " << m_global_image_id << " not registered"
  61                << dendl;
  62     } else {
  63       derr << "failed to retrieve image id: " << cpp_strerror(r) << dendl;
  64     }
  65     finish(r);
  66     return;
  67   }
  68
  69   finish(0);
  70 }
  71
  72 template <typename I>
  73 void GetMirrorImageIdRequest<I>::finish(int r) {
  74   dout(20) << "r=" << r << dendl;
  75
  76   m_on_finish->complete(r);
  77   delete this;
  78 }
  79
  80 } // namespace image_replayer
  81 } // namespace mirror
  82 } // namespace rbd
  83
  84 template class rbd::mirror::image_replayer::GetMirrorImageIdRequest<librbd::ImageCtx>;