+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "librbd/managed_lock/AcquireRequest.h"
-#include "librbd/Watcher.h"
-#include "cls/lock/cls_lock_client.h"
-#include "cls/lock/cls_lock_types.h"
-#include "common/dout.h"
-#include "common/errno.h"
-#include "common/WorkQueue.h"
-#include "include/stringify.h"
-#include "librbd/ImageCtx.h"
-#include "librbd/Utils.h"
-#include "librbd/managed_lock/BreakRequest.h"
-#include "librbd/managed_lock/GetLockerRequest.h"
-#include "librbd/managed_lock/Utils.h"
-
-#define dout_subsys ceph_subsys_rbd
-#undef dout_prefix
-#define dout_prefix *_dout << "librbd::managed_lock::AcquireRequest: " << this \
- << " " << __func__ << ": "
-
-using std::string;
-
-namespace librbd {
-
-using librbd::util::detail::C_AsyncCallback;
-using librbd::util::create_context_callback;
-using librbd::util::create_rados_callback;
-
-namespace managed_lock {
-
-template <typename I>
-AcquireRequest<I>* AcquireRequest<I>::create(librados::IoCtx& ioctx,
- Watcher *watcher,
- ContextWQ *work_queue,
- const string& oid,
- const string& cookie,
- bool exclusive,
- bool blacklist_on_break_lock,
- uint32_t blacklist_expire_seconds,
- Context *on_finish) {
- return new AcquireRequest(ioctx, watcher, work_queue, oid, cookie,
- exclusive, blacklist_on_break_lock,
- blacklist_expire_seconds, on_finish);
-}
-
-template <typename I>
-AcquireRequest<I>::AcquireRequest(librados::IoCtx& ioctx, Watcher *watcher,
- ContextWQ *work_queue, const string& oid,
- const string& cookie, bool exclusive,
- bool blacklist_on_break_lock,
- uint32_t blacklist_expire_seconds,
- Context *on_finish)
- : m_ioctx(ioctx), m_watcher(watcher),
- m_cct(reinterpret_cast<CephContext *>(m_ioctx.cct())),
- m_work_queue(work_queue), m_oid(oid), m_cookie(cookie),
- m_exclusive(exclusive),
- m_blacklist_on_break_lock(blacklist_on_break_lock),
- m_blacklist_expire_seconds(blacklist_expire_seconds),
- m_on_finish(new C_AsyncCallback<ContextWQ>(work_queue, on_finish)) {
-}
-
-template <typename I>
-AcquireRequest<I>::~AcquireRequest() {
-}
-
-template <typename I>
-void AcquireRequest<I>::send() {
- send_get_locker();
-}
-
-template <typename I>
-void AcquireRequest<I>::send_get_locker() {
- ldout(m_cct, 10) << dendl;
-
- Context *ctx = create_context_callback<
- AcquireRequest<I>, &AcquireRequest<I>::handle_get_locker>(this);
- auto req = GetLockerRequest<I>::create(m_ioctx, m_oid, m_exclusive,
- &m_locker, ctx);
- req->send();
-}
-
-template <typename I>
-void AcquireRequest<I>::handle_get_locker(int r) {
- ldout(m_cct, 10) << "r=" << r << dendl;
-
- if (r == -ENOENT) {
- ldout(m_cct, 20) << "no lockers detected" << dendl;
- m_locker = {};
- } else if (r == -EBUSY) {
- ldout(m_cct, 5) << "incompatible lock detected" << dendl;
- finish(r);
- return;
- } else if (r < 0) {
- lderr(m_cct) << "failed to retrieve lockers: " << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
-
- send_lock();
-}
-
-template <typename I>
-void AcquireRequest<I>::send_lock() {
- ldout(m_cct, 10) << "entity=client." << m_ioctx.get_instance_id() << ", "
- << "cookie=" << m_cookie << dendl;
-
- librados::ObjectWriteOperation op;
- rados::cls::lock::lock(&op, RBD_LOCK_NAME,
- m_exclusive ? LOCK_EXCLUSIVE : LOCK_SHARED, m_cookie,
- util::get_watcher_lock_tag(), "", utime_t(), 0);
-
- using klass = AcquireRequest;
- librados::AioCompletion *rados_completion =
- create_rados_callback<klass, &klass::handle_lock>(this);
- int r = m_ioctx.aio_operate(m_oid, rados_completion, &op);
- assert(r == 0);
- rados_completion->release();
-}
-
-template <typename I>
-void AcquireRequest<I>::handle_lock(int r) {
- ldout(m_cct, 10) << "r=" << r << dendl;
-
- if (r == 0) {
- finish(0);
- return;
- } else if (r == -EBUSY && m_locker.cookie.empty()) {
- ldout(m_cct, 5) << "already locked, refreshing locker" << dendl;
- send_get_locker();
- return;
- } else if (r != -EBUSY) {
- lderr(m_cct) << "failed to lock: " << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
-
- send_break_lock();
-}
-
-template <typename I>
-void AcquireRequest<I>::send_break_lock() {
- ldout(m_cct, 10) << dendl;
-
- Context *ctx = create_context_callback<
- AcquireRequest<I>, &AcquireRequest<I>::handle_break_lock>(this);
- auto req = BreakRequest<I>::create(
- m_ioctx, m_work_queue, m_oid, m_locker, m_exclusive,
- m_blacklist_on_break_lock, m_blacklist_expire_seconds, false, ctx);
- req->send();
-}
-
-template <typename I>
-void AcquireRequest<I>::handle_break_lock(int r) {
- ldout(m_cct, 10) << "r=" << r << dendl;
-
- if (r == -EAGAIN) {
- ldout(m_cct, 5) << "lock owner is still alive" << dendl;
- finish(r);
- return;
- } else if (r < 0) {
- lderr(m_cct) << "failed to break lock : " << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
-
- m_locker = {};
- send_lock();
-}
-
-template <typename I>
-void AcquireRequest<I>::finish(int r) {
- m_on_finish->complete(r);
- delete this;
-}
-
-} // namespace managed_lock
-} // namespace librbd
-
-template class librbd::managed_lock::AcquireRequest<librbd::ImageCtx>;