ceph/src/librbd/object_map/RemoveRequest.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/object_map/RemoveRequest.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/ObjectMap.h"
  10 #include "librbd/Utils.h"
  11 #include "include/ceph_assert.h"
  12
  13 #define dout_subsys ceph_subsys_rbd
  14 #undef dout_prefix
  15 #define dout_prefix *_dout << "librbd::object_map::RemoveRequest: "
  16
  17 namespace librbd {
  18 namespace object_map {
  19
  20 using util::create_rados_callback;
  21
  22 template <typename I>
  23 RemoveRequest<I>::RemoveRequest(I *image_ctx, Context *on_finish)
  24   : m_image_ctx(image_ctx), m_on_finish(on_finish) {
  25 }
  26
  27 template <typename I>
  28 void RemoveRequest<I>::send() {
  29   send_remove_object_map();
  30 }
  31
  32 template <typename I>
  33 void RemoveRequest<I>::send_remove_object_map() {
  34   CephContext *cct = m_image_ctx->cct;
  35   ldout(cct, 20) << __func__ << dendl;
  36
  37   std::unique_lock image_locker{m_image_ctx->image_lock};
  38   std::vector<uint64_t> snap_ids;
  39   snap_ids.push_back(CEPH_NOSNAP);
  40   for (auto it : m_image_ctx->snap_info) {
  41     snap_ids.push_back(it.first);
  42   }
  43
  44   std::lock_guard locker{m_lock};
  45   ceph_assert(m_ref_counter == 0);
  46
  47   for (auto snap_id : snap_ids) {
  48     m_ref_counter++;
  49     std::string oid(ObjectMap<>::object_map_name(m_image_ctx->id, snap_id));
  50     using klass = RemoveRequest<I>;
  51     librados::AioCompletion *comp =
  52       create_rados_callback<klass, &klass::handle_remove_object_map>(this);
  53
  54     int r = m_image_ctx->md_ctx.aio_remove(oid, comp);
  55     ceph_assert(r == 0);
  56     comp->release();
  57   }
  58 }
  59
  60 template <typename I>
  61 Context *RemoveRequest<I>::handle_remove_object_map(int *result) {
  62   CephContext *cct = m_image_ctx->cct;
  63   ldout(cct, 20) << __func__ << ": r=" << *result << dendl;
  64
  65   {
  66     std::lock_guard locker{m_lock};
  67     ceph_assert(m_ref_counter > 0);
  68     m_ref_counter--;
  69
  70     if (*result < 0 && *result != -ENOENT) {
  71       lderr(cct) << "failed to remove object map: " << cpp_strerror(*result)
  72                  << dendl;
  73       m_error_result = *result;
  74     }
  75     if (m_ref_counter > 0) {
  76       return nullptr;
  77     }
  78   }
  79   if (m_error_result < 0) {
  80     *result = m_error_result;
  81   }
  82   return m_on_finish;
  83 }
  84
  85 } // namespace object_map
  86 } // namespace librbd
  87
  88 template class librbd::object_map::RemoveRequest<librbd::ImageCtx>;