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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/BreakRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "common/WorkQueue.h"
#include "include/stringify.h"
#include "cls/lock/cls_lock_client.h"
#include "cls/lock/cls_lock_types.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
#include "librbd/managed_lock/GetLockerRequest.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::managed_lock::BreakRequest: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace managed_lock {
using util::create_context_callback;
using util::create_rados_callback;
namespace {
struct C_BlacklistClient : public Context {
librados::IoCtx &ioctx;
std::string locker_address;
uint32_t expire_seconds;
Context *on_finish;
C_BlacklistClient(librados::IoCtx &ioctx, const std::string &locker_address,
uint32_t expire_seconds, Context *on_finish)
: ioctx(ioctx), locker_address(locker_address),
expire_seconds(expire_seconds), on_finish(on_finish) {
}
void finish(int r) override {
librados::Rados rados(ioctx);
r = rados.blacklist_add(locker_address, expire_seconds);
on_finish->complete(r);
}
};
} // anonymous namespace
template <typename I>
BreakRequest<I>::BreakRequest(librados::IoCtx& ioctx, ContextWQ *work_queue,
const std::string& oid, const Locker &locker,
bool exclusive, bool blacklist_locker,
uint32_t blacklist_expire_seconds,
bool force_break_lock, Context *on_finish)
: m_ioctx(ioctx), m_cct(reinterpret_cast<CephContext *>(m_ioctx.cct())),
m_work_queue(work_queue), m_oid(oid), m_locker(locker),
m_exclusive(exclusive), m_blacklist_locker(blacklist_locker),
m_blacklist_expire_seconds(blacklist_expire_seconds),
m_force_break_lock(force_break_lock), m_on_finish(on_finish) {
}
template <typename I>
void BreakRequest<I>::send() {
send_get_watchers();
}
template <typename I>
void BreakRequest<I>::send_get_watchers() {
ldout(m_cct, 10) << dendl;
librados::ObjectReadOperation op;
op.list_watchers(&m_watchers, &m_watchers_ret_val);
using klass = BreakRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_get_watchers>(this);
m_out_bl.clear();
int r = m_ioctx.aio_operate(m_oid, rados_completion, &op, &m_out_bl);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void BreakRequest<I>::handle_get_watchers(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r == 0) {
r = m_watchers_ret_val;
}
if (r < 0) {
lderr(m_cct) << "failed to retrieve watchers: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
bool found_alive_locker = false;
for (auto &watcher : m_watchers) {
ldout(m_cct, 20) << "watcher=["
<< "addr=" << watcher.addr << ", "
<< "entity=client." << watcher.watcher_id << "]" << dendl;
if ((strncmp(m_locker.address.c_str(),
watcher.addr, sizeof(watcher.addr)) == 0) &&
(m_locker.handle == watcher.cookie)) {
ldout(m_cct, 10) << "lock owner is still alive" << dendl;
found_alive_locker = true;
}
}
if (!m_force_break_lock && found_alive_locker) {
finish(-EAGAIN);
return;
}
send_get_locker();
}
template <typename I>
void BreakRequest<I>::send_get_locker() {
ldout(m_cct, 10) << dendl;
using klass = BreakRequest<I>;
Context *ctx = create_context_callback<klass, &klass::handle_get_locker>(
this);
auto req = GetLockerRequest<I>::create(m_ioctx, m_oid, m_exclusive,
&m_refreshed_locker, ctx);
req->send();
}
template <typename I>
void BreakRequest<I>::handle_get_locker(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r == -ENOENT) {
ldout(m_cct, 5) << "no lock owner" << dendl;
finish(0);
return;
} else if (r < 0 && r != -EBUSY) {
lderr(m_cct) << "failed to retrieve lockers: " << cpp_strerror(r) << dendl;
finish(r);
return;
} else if (r < 0) {
m_refreshed_locker = {};
}
if (m_refreshed_locker != m_locker || m_refreshed_locker == Locker{}) {
ldout(m_cct, 5) << "no longer lock owner" << dendl;
finish(-EAGAIN);
return;
}
send_blacklist();
}
template <typename I>
void BreakRequest<I>::send_blacklist() {
if (!m_blacklist_locker) {
send_break_lock();
return;
}
entity_name_t entity_name = entity_name_t::CLIENT(m_ioctx.get_instance_id());
ldout(m_cct, 10) << "local entity=" << entity_name << ", "
<< "locker entity=" << m_locker.entity << dendl;
if (m_locker.entity == entity_name) {
lderr(m_cct) << "attempting to self-blacklist" << dendl;
finish(-EINVAL);
return;
}
// TODO: need async version of RadosClient::blacklist_add
using klass = BreakRequest<I>;
Context *ctx = create_context_callback<klass, &klass::handle_blacklist>(
this);
m_work_queue->queue(new C_BlacklistClient(m_ioctx, m_locker.address,
m_blacklist_expire_seconds, ctx),
0);
}
template <typename I>
void BreakRequest<I>::handle_blacklist(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r < 0) {
lderr(m_cct) << "failed to blacklist lock owner: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
send_break_lock();
}
template <typename I>
void BreakRequest<I>::send_break_lock() {
ldout(m_cct, 10) << dendl;
librados::ObjectWriteOperation op;
rados::cls::lock::break_lock(&op, RBD_LOCK_NAME, m_locker.cookie,
m_locker.entity);
using klass = BreakRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_break_lock>(this);
int r = m_ioctx.aio_operate(m_oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
void BreakRequest<I>::handle_break_lock(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
lderr(m_cct) << "failed to break lock: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
finish(0);
}
template <typename I>
void BreakRequest<I>::finish(int r) {
ldout(m_cct, 10) << "r=" << r << dendl;
m_on_finish->complete(r);
delete this;
}
} // namespace managed_lock
} // namespace librbd
template class librbd::managed_lock::BreakRequest<librbd::ImageCtx>;
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