ceph/src/librbd/mirror/GetInfoRequest.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 "librbd/mirror/GetInfoRequest.h"
   5 #include "common/dout.h"
   6 #include "common/errno.h"
   7 #include "cls/rbd/cls_rbd_client.h"
   8 #include "librbd/ImageCtx.h"
   9 #include "librbd/ImageState.h"
  10 #include "librbd/Journal.h"
  11 #include "librbd/Utils.h"
  12
  13 #define dout_subsys ceph_subsys_rbd
  14 #undef dout_prefix
  15 #define dout_prefix *_dout << "librbd::mirror::GetInfoRequest: " << this \
  16                            << " " << __func__ << ": "
  17
  18 namespace librbd {
  19 namespace mirror {
  20
  21 using librbd::util::create_context_callback;
  22 using librbd::util::create_rados_callback;
  23
  24 template <typename I>
  25 void GetInfoRequest<I>::send() {
  26   get_mirror_image();
  27 }
  28
  29 template <typename I>
  30 void GetInfoRequest<I>::get_mirror_image() {
  31   CephContext *cct = m_image_ctx.cct;
  32   ldout(cct, 20) << dendl;
  33
  34   librados::ObjectReadOperation op;
  35   cls_client::mirror_image_get_start(&op, m_image_ctx.id);
  36
  37   librados::AioCompletion *comp = create_rados_callback<
  38     GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_mirror_image>(this);
  39   int r = m_image_ctx.md_ctx.aio_operate(RBD_MIRRORING, comp, &op, &m_out_bl);
  40   ceph_assert(r == 0);
  41   comp->release();
  42 }
  43
  44 template <typename I>
  45 void GetInfoRequest<I>::handle_get_mirror_image(int r) {
  46   CephContext *cct = m_image_ctx.cct;
  47   ldout(cct, 20) << "r=" << r << dendl;
  48
  49   m_mirror_image->state = cls::rbd::MIRROR_IMAGE_STATE_DISABLED;
  50   *m_promotion_state = PROMOTION_STATE_NON_PRIMARY;
  51   if (r == 0) {
  52     auto iter = m_out_bl.cbegin();
  53     r = cls_client::mirror_image_get_finish(&iter, m_mirror_image);
  54   }
  55
  56   if (r == -ENOENT ||
  57       m_mirror_image->state != cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
  58     ldout(cct, 20) << "mirroring is disabled" << dendl;
  59     finish(0);
  60     return;
  61   } else if (r < 0) {
  62     lderr(cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
  63                << dendl;
  64     finish(r);
  65     return;
  66   }
  67
  68   get_tag_owner();
  69 }
  70
  71 template <typename I>
  72 void GetInfoRequest<I>::get_tag_owner() {
  73   CephContext *cct = m_image_ctx.cct;
  74   ldout(cct, 20) << dendl;
  75
  76   auto ctx = create_context_callback<
  77     GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_tag_owner>(this);
  78   Journal<I>::get_tag_owner(m_image_ctx.md_ctx, m_image_ctx.id,
  79                             &m_mirror_uuid, m_image_ctx.op_work_queue, ctx);
  80 }
  81
  82 template <typename I>
  83 void GetInfoRequest<I>::handle_get_tag_owner(int r) {
  84   CephContext *cct = m_image_ctx.cct;
  85   ldout(cct, 20) << "r=" << r << dendl;
  86
  87   if (r < 0) {
  88     lderr(cct) << "failed to determine tag ownership: " << cpp_strerror(r)
  89                << dendl;
  90     finish(r);
  91     return;
  92   }
  93
  94   if (m_mirror_uuid == Journal<>::LOCAL_MIRROR_UUID) {
  95     *m_promotion_state = PROMOTION_STATE_PRIMARY;
  96   } else if (m_mirror_uuid == Journal<>::ORPHAN_MIRROR_UUID) {
  97     *m_promotion_state = PROMOTION_STATE_ORPHAN;
  98   }
  99
 100   finish(0);
 101 }
 102
 103 template <typename I>
 104 void GetInfoRequest<I>::finish(int r) {
 105   CephContext *cct = m_image_ctx.cct;
 106   ldout(cct, 20) << "r=" << r << dendl;
 107
 108   m_on_finish->complete(r);
 109   delete this;
 110 }
 111
 112 } // namespace mirror
 113 } // namespace librbd
 114
 115 template class librbd::mirror::GetInfoRequest<librbd::ImageCtx>;