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-rw-r--r--src/librbd/managed_lock/AcquireRequest.cc181
1 files changed, 181 insertions, 0 deletions
diff --git a/src/librbd/managed_lock/AcquireRequest.cc b/src/librbd/managed_lock/AcquireRequest.cc
new file mode 100644
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+++ b/src/librbd/managed_lock/AcquireRequest.cc
@@ -0,0 +1,181 @@
+// -*- 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);
+ ceph_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>;