ceph/src/librbd/image/AttachParentRequest.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/image/AttachParentRequest.h"
   5 #include "common/dout.h"
   6 #include "common/errno.h"
   7 #include "common/WorkQueue.h"
   8 #include "cls/rbd/cls_rbd_client.h"
   9 #include "librbd/ImageCtx.h"
  10 #include "librbd/Utils.h"
  11
  12 #define dout_subsys ceph_subsys_rbd
  13 #undef dout_prefix
  14 #define dout_prefix *_dout << "librbd::image::AttachParentRequest: " << this \
  15                            << " " << __func__ << ": "
  16
  17 namespace librbd {
  18 namespace image {
  19
  20 using util::create_rados_callback;
  21
  22 template <typename I>
  23 void AttachParentRequest<I>::send() {
  24   attach_parent();
  25 }
  26
  27 template <typename I>
  28 void AttachParentRequest<I>::attach_parent() {
  29   auto cct = m_image_ctx.cct;
  30   ldout(cct, 5) << "parent_image_spec=" << m_parent_image_spec << dendl;
  31
  32   librados::ObjectWriteOperation op;
  33   if (!m_legacy_parent) {
  34     librbd::cls_client::parent_attach(&op, m_parent_image_spec,
  35                                       m_parent_overlap, m_reattach);
  36   } else {
  37     librbd::cls_client::set_parent(&op, m_parent_image_spec, m_parent_overlap);
  38   }
  39
  40   auto aio_comp = create_rados_callback<
  41     AttachParentRequest<I>,
  42     &AttachParentRequest<I>::handle_attach_parent>(this);
  43   int r = m_image_ctx.md_ctx.aio_operate(m_image_ctx.header_oid, aio_comp, &op);
  44   ceph_assert(r == 0);
  45   aio_comp->release();
  46 }
  47
  48 template <typename I>
  49 void AttachParentRequest<I>::handle_attach_parent(int r) {
  50   auto cct = m_image_ctx.cct;
  51   ldout(cct, 5) << dendl;
  52
  53   if (!m_legacy_parent && r == -EOPNOTSUPP && !m_reattach) {
  54     if (m_parent_image_spec.pool_namespace ==
  55           m_image_ctx.md_ctx.get_namespace()) {
  56       m_parent_image_spec.pool_namespace = "";
  57     }
  58     if (m_parent_image_spec.pool_namespace.empty()) {
  59       ldout(cct, 10) << "retrying using legacy parent method" << dendl;
  60       m_legacy_parent = true;
  61       attach_parent();
  62       return;
  63     }
  64
  65     // namespaces require newer OSDs
  66     r = -EXDEV;
  67   }
  68
  69   if (r < 0) {
  70     lderr(cct) << "attach parent encountered an error: " << cpp_strerror(r)
  71                << dendl;
  72     finish(r);
  73     return;
  74   }
  75
  76   finish(0);
  77 }
  78
  79 template <typename I>
  80 void AttachParentRequest<I>::finish(int r) {
  81   auto cct = m_image_ctx.cct;
  82   ldout(cct, 5) << "r=" << r << dendl;
  83
  84   m_on_finish->complete(r);
  85   delete this;
  86 }
  87
  88 } // namespace image
  89 } // namespace librbd
  90
  91 template class librbd::image::AttachParentRequest<librbd::ImageCtx>;