ceph/src/tools/rbd_mirror/image_map/LoadRequest.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 "common/debug.h"
   5 #include "common/errno.h"
   6
   7 #include "librbd/Utils.h"
   8 #include "include/rbd_types.h"
   9 #include "cls/rbd/cls_rbd_client.h"
  10
  11 #include "UpdateRequest.h"
  12 #include "LoadRequest.h"
  13
  14 #define dout_context g_ceph_context
  15 #define dout_subsys ceph_subsys_rbd_mirror
  16 #undef dout_prefix
  17 #define dout_prefix *_dout << "rbd::mirror::image_map::LoadRequest: "   \
  18                            << this << " " << __func__
  19
  20 namespace rbd {
  21 namespace mirror {
  22 namespace image_map {
  23
  24 static const uint32_t MAX_RETURN = 1024;
  25
  26 using librbd::util::create_rados_callback;
  27 using librbd::util::create_context_callback;
  28
  29 template<typename I>
  30 LoadRequest<I>::LoadRequest(librados::IoCtx &ioctx,
  31                             std::map<std::string, cls::rbd::MirrorImageMap> *image_mapping,
  32                             Context *on_finish)
  33   : m_ioctx(ioctx),
  34     m_image_mapping(image_mapping),
  35     m_on_finish(on_finish) {
  36 }
  37
  38 template<typename I>
  39 void LoadRequest<I>::send() {
  40   dout(20) << dendl;
  41
  42   image_map_list();
  43 }
  44
  45 template<typename I>
  46 void LoadRequest<I>::image_map_list() {
  47   dout(20) << dendl;
  48
  49   librados::ObjectReadOperation op;
  50   librbd::cls_client::mirror_image_map_list_start(&op, m_start_after, MAX_RETURN);
  51
  52   librados::AioCompletion *aio_comp = create_rados_callback<
  53     LoadRequest, &LoadRequest::handle_image_map_list>(this);
  54
  55   m_out_bl.clear();
  56   int r = m_ioctx.aio_operate(RBD_MIRROR_LEADER, aio_comp, &op, &m_out_bl);
  57   ceph_assert(r == 0);
  58   aio_comp->release();
  59 }
  60
  61 template<typename I>
  62 void LoadRequest<I>::handle_image_map_list(int r) {
  63   dout(20) << ": r=" << r << dendl;
  64
  65   std::map<std::string, cls::rbd::MirrorImageMap> image_mapping;
  66   if (r == 0) {
  67     auto it = m_out_bl.cbegin();
  68     r = librbd::cls_client::mirror_image_map_list_finish(&it, &image_mapping);
  69   }
  70
  71   if (r < 0) {
  72     derr << ": failed to get image map: " << cpp_strerror(r) << dendl;
  73     finish(r);
  74     return;
  75   }
  76
  77   m_image_mapping->insert(image_mapping.begin(), image_mapping.end());
  78
  79   if (image_mapping.size() == MAX_RETURN) {
  80     m_start_after = image_mapping.rbegin()->first;
  81     image_map_list();
  82     return;
  83   }
  84
  85   mirror_image_list();
  86 }
  87
  88 template<typename I>
  89 void LoadRequest<I>::mirror_image_list() {
  90   dout(20) << dendl;
  91
  92   librados::ObjectReadOperation op;
  93   librbd::cls_client::mirror_image_list_start(&op, m_start_after, MAX_RETURN);
  94
  95   m_out_bl.clear();
  96   librados::AioCompletion *aio_comp = create_rados_callback<
  97     LoadRequest<I>,
  98     &LoadRequest<I>::handle_mirror_image_list>(this);
  99   int r = m_ioctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
 100   ceph_assert(r == 0);
 101   aio_comp->release();
 102 }
 103
 104 template<typename I>
 105 void LoadRequest<I>::handle_mirror_image_list(int r) {
 106   dout(20) << ": r=" << r << dendl;
 107
 108   std::map<std::string, std::string> ids;
 109   if (r == 0) {
 110     auto it = m_out_bl.cbegin();
 111     r = librbd::cls_client::mirror_image_list_finish(&it, &ids);
 112   }
 113
 114   if (r < 0 && r != -ENOENT) {
 115     derr << "failed to list mirrored images: " << cpp_strerror(r) << dendl;
 116     finish(r);
 117     return;
 118   }
 119
 120   for (auto &id : ids) {
 121     m_global_image_ids.emplace(id.second);
 122   }
 123
 124   if (ids.size() == MAX_RETURN) {
 125     m_start_after = ids.rbegin()->first;
 126     mirror_image_list();
 127     return;
 128   }
 129
 130   cleanup_image_map();
 131 }
 132
 133 template<typename I>
 134 void LoadRequest<I>::cleanup_image_map() {
 135   dout(20) << dendl;
 136
 137   std::set<std::string> map_removals;
 138
 139   auto it = m_image_mapping->begin();
 140   while (it != m_image_mapping->end()) {
 141     if (m_global_image_ids.count(it->first) > 0) {
 142       ++it;
 143       continue;
 144     }
 145     map_removals.emplace(it->first);
 146     it = m_image_mapping->erase(it);
 147   }
 148
 149   if (map_removals.size() == 0) {
 150     finish(0);
 151     return;
 152   }
 153
 154   auto ctx = create_context_callback<
 155      LoadRequest<I>,
 156      &LoadRequest<I>::finish>(this);
 157   image_map::UpdateRequest<I> *req = image_map::UpdateRequest<I>::create(
 158     m_ioctx, {}, std::move(map_removals), ctx);
 159   req->send();
 160 }
 161
 162 template<typename I>
 163 void LoadRequest<I>::finish(int r) {
 164   dout(20) << ": r=" << r << dendl;
 165
 166   m_on_finish->complete(r);
 167   delete this;
 168 }
 169
 170 } // namespace image_map
 171 } // namespace mirror
 172 } // namespace rbd
 173
 174 template class rbd::mirror::image_map::LoadRequest<librbd::ImageCtx>;