ceph/src/librbd/managed_lock/ReleaseRequest.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/managed_lock/ReleaseRequest.h"
   5 #include "librbd/Watcher.h"
   6 #include "cls/lock/cls_lock_client.h"
   7 #include "cls/lock/cls_lock_types.h"
   8 #include "common/dout.h"
   9 #include "common/errno.h"
  10 #include "librbd/Utils.h"
  11
  12 #include "librbd/ImageCtx.h"
  13
  14 #define dout_subsys ceph_subsys_rbd
  15 #undef dout_prefix
  16 #define dout_prefix *_dout << "librbd::managed_lock::ReleaseRequest: " \
  17                             << this << " " << __func__ << ": "
  18
  19 namespace librbd {
  20 namespace managed_lock {
  21
  22 using util::detail::C_AsyncCallback;
  23 using util::create_context_callback;
  24 using util::create_rados_callback;
  25
  26 template <typename I>
  27 ReleaseRequest<I>* ReleaseRequest<I>::create(librados::IoCtx& ioctx,
  28                                              Watcher *watcher,
  29                                              ContextWQ *work_queue,
  30                                              const string& oid,
  31                                              const string& cookie,
  32                                              Context *on_finish) {
  33   return new ReleaseRequest(ioctx, watcher, work_queue, oid, cookie,
  34                             on_finish);
  35 }
  36
  37 template <typename I>
  38 ReleaseRequest<I>::ReleaseRequest(librados::IoCtx& ioctx, Watcher *watcher,
  39                                   ContextWQ *work_queue, const string& oid,
  40                                   const string& cookie, Context *on_finish)
  41   : m_ioctx(ioctx), m_watcher(watcher), m_oid(oid), m_cookie(cookie),
  42     m_on_finish(new C_AsyncCallback<ContextWQ>(work_queue, on_finish)) {
  43 }
  44
  45 template <typename I>
  46 ReleaseRequest<I>::~ReleaseRequest() {
  47 }
  48
  49
  50 template <typename I>
  51 void ReleaseRequest<I>::send() {
  52   send_unlock();
  53 }
  54
  55 template <typename I>
  56 void ReleaseRequest<I>::send_unlock() {
  57   CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
  58   ldout(cct, 10) << "entity=client." << m_ioctx.get_instance_id() << ", "
  59                  << "cookie=" << m_cookie << dendl;
  60
  61   librados::ObjectWriteOperation op;
  62   rados::cls::lock::unlock(&op, RBD_LOCK_NAME, m_cookie);
  63
  64   using klass = ReleaseRequest;
  65   librados::AioCompletion *rados_completion =
  66     create_rados_callback<klass, &klass::handle_unlock>(this);
  67   int r = m_ioctx.aio_operate(m_oid, rados_completion, &op);
  68   ceph_assert(r == 0);
  69   rados_completion->release();
  70 }
  71
  72 template <typename I>
  73 void ReleaseRequest<I>::handle_unlock(int r) {
  74   CephContext *cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
  75   ldout(cct, 10) << "r=" << r << dendl;
  76
  77   if (r < 0 && r != -ENOENT) {
  78     lderr(cct) << "failed to unlock: " << cpp_strerror(r) << dendl;
  79   }
  80
  81   finish();
  82 }
  83
  84 template <typename I>
  85 void ReleaseRequest<I>::finish() {
  86   m_on_finish->complete(0);
  87   delete this;
  88 }
  89
  90 } // namespace managed_lock
  91 } // namespace librbd
  92
  93 template class librbd::managed_lock::ReleaseRequest<librbd::ImageCtx>;
  94