ceph/src/librbd/operation/SnapshotLimitRequest.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/operation/SnapshotLimitRequest.h"
   5 #include "common/dout.h"
   6 #include "common/errno.h"
   7 #include "librbd/ImageCtx.h"
   8
   9 #define dout_subsys ceph_subsys_rbd
  10 #undef dout_prefix
  11 #define dout_prefix *_dout << "librbd::SnapshotLimitRequest: "
  12
  13 namespace librbd {
  14 namespace operation {
  15
  16 template <typename I>
  17 SnapshotLimitRequest<I>::SnapshotLimitRequest(I &image_ctx,
  18                                               Context *on_finish,
  19                                               uint64_t limit)
  20   : Request<I>(image_ctx, on_finish), m_snap_limit(limit) {
  21 }
  22
  23 template <typename I>
  24 void SnapshotLimitRequest<I>::send_op() {
  25   send_limit_snaps();
  26 }
  27
  28 template <typename I>
  29 bool SnapshotLimitRequest<I>::should_complete(int r) {
  30   I &image_ctx = this->m_image_ctx;
  31   CephContext *cct = image_ctx.cct;
  32   ldout(cct, 5) << this << " " << __func__ << " r=" << r << dendl;
  33
  34   if (r < 0) {
  35     lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl;
  36   }
  37   return true;
  38 }
  39
  40 template <typename I>
  41 void SnapshotLimitRequest<I>::send_limit_snaps() {
  42   I &image_ctx = this->m_image_ctx;
  43   ceph_assert(image_ctx.owner_lock.is_locked());
  44
  45   CephContext *cct = image_ctx.cct;
  46   ldout(cct, 5) << this << " " << __func__ << dendl;
  47
  48   {
  49     RWLock::RLocker md_locker(image_ctx.md_lock);
  50     RWLock::RLocker snap_locker(image_ctx.snap_lock);
  51
  52     librados::ObjectWriteOperation op;
  53     cls_client::snapshot_set_limit(&op, m_snap_limit);
  54
  55     librados::AioCompletion *rados_completion =
  56       this->create_callback_completion();
  57     int r = image_ctx.md_ctx.aio_operate(image_ctx.header_oid, rados_completion,
  58                                          &op);
  59     ceph_assert(r == 0);
  60     rados_completion->release();
  61   }
  62 }
  63
  64 } // namespace operation
  65 } // namespace librbd
  66
  67 template class librbd::operation::SnapshotLimitRequest<librbd::ImageCtx>;