ceph/src/librbd/image/DetachParentRequest.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/DetachParentRequest.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::DetachParentRequest: " << this \
  15                            << " " << __func__ << ": "
  16
  17 namespace librbd {
  18 namespace image {
  19
  20 using util::create_context_callback;
  21 using util::create_rados_callback;
  22
  23 template <typename I>
  24 void DetachParentRequest<I>::send() {
  25   detach_parent();
  26 }
  27
  28 template <typename I>
  29 void DetachParentRequest<I>::detach_parent() {
  30   auto cct = m_image_ctx.cct;
  31   ldout(cct, 5) << dendl;
  32
  33   librados::ObjectWriteOperation op;
  34   if (!m_legacy_parent) {
  35     librbd::cls_client::parent_detach(&op);
  36   } else {
  37     librbd::cls_client::remove_parent(&op);
  38   }
  39
  40   auto aio_comp = create_rados_callback<
  41     DetachParentRequest<I>,
  42     &DetachParentRequest<I>::handle_detach_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 DetachParentRequest<I>::handle_detach_parent(int r) {
  50   auto cct = m_image_ctx.cct;
  51   ldout(cct, 5) << dendl;
  52
  53    if (!m_legacy_parent && r == -EOPNOTSUPP) {
  54     ldout(cct, 10) << "retrying using legacy parent method" << dendl;
  55     m_legacy_parent = true;
  56     detach_parent();
  57     return;
  58   }
  59
  60   if (r < 0 && r != -ENOENT) {
  61     lderr(cct) << "detach parent encountered an error: " << cpp_strerror(r)
  62                << dendl;
  63     finish(r);
  64     return;
  65   }
  66
  67   finish(0);
  68 }
  69
  70 template <typename I>
  71 void DetachParentRequest<I>::finish(int r) {
  72   auto cct = m_image_ctx.cct;
  73   ldout(cct, 5) << "r=" << r << dendl;
  74
  75   m_on_finish->complete(r);
  76   delete this;
  77 }
  78
  79 } // namespace image
  80 } // namespace librbd
  81
  82 template class librbd::image::DetachParentRequest<librbd::ImageCtx>;