ceph/src/tools/rbd_mirror/image_replayer/PrepareRemoteImageRequest.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/PrepareRemoteImageRequest.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 #include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h"
  11
  12 #define dout_context g_ceph_context
  13 #define dout_subsys ceph_subsys_rbd_mirror
  14 #undef dout_prefix
  15 #define dout_prefix *_dout << "rbd::mirror::image_replayer::" \
  16                            << "PrepareRemoteImageRequest: " << this << " " \
  17                            << __func__ << ": "
  18
  19 namespace rbd {
  20 namespace mirror {
  21 namespace image_replayer {
  22
  23 using librbd::util::create_context_callback;
  24 using librbd::util::create_rados_callback;
  25
  26 template <typename I>
  27 void PrepareRemoteImageRequest<I>::send() {
  28   get_remote_mirror_uuid();
  29 }
  30
  31 template <typename I>
  32 void PrepareRemoteImageRequest<I>::get_remote_mirror_uuid() {
  33   dout(20) << dendl;
  34
  35   librados::ObjectReadOperation op;
  36   librbd::cls_client::mirror_uuid_get_start(&op);
  37
  38   librados::AioCompletion *aio_comp = create_rados_callback<
  39     PrepareRemoteImageRequest<I>,
  40     &PrepareRemoteImageRequest<I>::handle_get_remote_mirror_uuid>(this);
  41   int r = m_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
  42   assert(r == 0);
  43   aio_comp->release();
  44 }
  45
  46 template <typename I>
  47 void PrepareRemoteImageRequest<I>::handle_get_remote_mirror_uuid(int r) {
  48   if (r >= 0) {
  49     bufferlist::iterator it = m_out_bl.begin();
  50     r = librbd::cls_client::mirror_uuid_get_finish(&it, m_remote_mirror_uuid);
  51     if (r >= 0 && m_remote_mirror_uuid->empty()) {
  52       r = -ENOENT;
  53     }
  54   }
  55
  56   dout(20) << "r=" << r << dendl;
  57   if (r < 0) {
  58     if (r == -ENOENT) {
  59       dout(5) << "remote mirror uuid missing" << dendl;
  60     } else {
  61       derr << "failed to retrieve remote mirror uuid: " << cpp_strerror(r)
  62            << dendl;
  63     }
  64     finish(r);
  65     return;
  66   }
  67
  68   get_remote_image_id();
  69 }
  70
  71 template <typename I>
  72 void PrepareRemoteImageRequest<I>::get_remote_image_id() {
  73   dout(20) << dendl;
  74
  75   Context *ctx = create_context_callback<
  76     PrepareRemoteImageRequest<I>,
  77     &PrepareRemoteImageRequest<I>::handle_get_remote_image_id>(this);
  78   auto req = GetMirrorImageIdRequest<I>::create(m_io_ctx, m_global_image_id,
  79                                                 m_remote_image_id, ctx);
  80   req->send();
  81 }
  82
  83 template <typename I>
  84 void PrepareRemoteImageRequest<I>::handle_get_remote_image_id(int r) {
  85   dout(20) << "r=" << r << ", "
  86            << "remote_image_id=" << *m_remote_image_id << dendl;
  87
  88   if (r < 0) {
  89     finish(r);
  90     return;
  91   }
  92
  93   finish(0);
  94 }
  95
  96 template <typename I>
  97 void PrepareRemoteImageRequest<I>::finish(int r) {
  98   dout(20) << "r=" << r << dendl;
  99
 100   m_on_finish->complete(r);
 101   delete this;
 102 }
 103
 104 } // namespace image_replayer
 105 } // namespace mirror
 106 } // namespace rbd
 107
 108 template class rbd::mirror::image_replayer::PrepareRemoteImageRequest<librbd::ImageCtx>;