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// -*- 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 "include/stringify.h"
#include "librbd/AsioEngine.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/asio/ContextWQ.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,
AsioEngine& asio_engine,
const string& oid,
const string& cookie,
bool exclusive,
bool blocklist_on_break_lock,
uint32_t blocklist_expire_seconds,
Context *on_finish) {
return new AcquireRequest(ioctx, watcher, asio_engine, oid, cookie,
exclusive, blocklist_on_break_lock,
blocklist_expire_seconds, on_finish);
}
template <typename I>
AcquireRequest<I>::AcquireRequest(librados::IoCtx& ioctx, Watcher *watcher,
AsioEngine& asio_engine,
const string& oid,
const string& cookie, bool exclusive,
bool blocklist_on_break_lock,
uint32_t blocklist_expire_seconds,
Context *on_finish)
: m_ioctx(ioctx), m_watcher(watcher),
m_cct(reinterpret_cast<CephContext *>(m_ioctx.cct())),
m_asio_engine(asio_engine), m_oid(oid), m_cookie(cookie),
m_exclusive(exclusive),
m_blocklist_on_break_lock(blocklist_on_break_lock),
m_blocklist_expire_seconds(blocklist_expire_seconds),
m_on_finish(new C_AsyncCallback<asio::ContextWQ>(
asio_engine.get_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 ? ClsLockType::EXCLUSIVE : ClsLockType::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_asio_engine, m_oid, m_locker, m_exclusive,
m_blocklist_on_break_lock, m_blocklist_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>;
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