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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/object_map/LockRequest.h"
#include "cls/lock/cls_lock_client.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/ObjectMap.h"
#include "librbd/Utils.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::object_map::LockRequest: "
namespace librbd {
namespace object_map {
using util::create_rados_callback;
template <typename I>
LockRequest<I>::LockRequest(I &image_ctx, Context *on_finish)
: m_image_ctx(image_ctx), m_on_finish(on_finish), m_broke_lock(false) {
}
template <typename I>
void LockRequest<I>::send() {
send_lock();
}
template <typename I>
void LockRequest<I>::send_lock() {
CephContext *cct = m_image_ctx.cct;
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << dendl;
librados::ObjectWriteOperation op;
rados::cls::lock::lock(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "", "",
utime_t(), 0);
using klass = LockRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_lock>(this);
int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
Context *LockRequest<I>::handle_lock(int *ret_val) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
if (*ret_val == 0) {
return m_on_finish;
} else if (*ret_val == -EEXIST) {
// already locked by myself
*ret_val = 0;
return m_on_finish;
} else if (m_broke_lock || *ret_val != -EBUSY) {
lderr(cct) << "failed to lock object map: " << cpp_strerror(*ret_val)
<< dendl;
*ret_val = 0;
return m_on_finish;
}
send_get_lock_info();
return nullptr;
}
template <typename I>
void LockRequest<I>::send_get_lock_info() {
CephContext *cct = m_image_ctx.cct;
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << dendl;
librados::ObjectReadOperation op;
rados::cls::lock::get_lock_info_start(&op, RBD_LOCK_NAME);
using klass = LockRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_get_lock_info>(this);
int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op, &m_out_bl);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
Context *LockRequest<I>::handle_get_lock_info(int *ret_val) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
if (*ret_val == -ENOENT) {
send_lock();
return nullptr;
}
ClsLockType lock_type;
std::string lock_tag;
if (*ret_val == 0) {
auto it = m_out_bl.cbegin();
*ret_val = rados::cls::lock::get_lock_info_finish(&it, &m_lockers,
&lock_type, &lock_tag);
}
if (*ret_val < 0) {
lderr(cct) << "failed to list object map locks: " << cpp_strerror(*ret_val)
<< dendl;
*ret_val = 0;
return m_on_finish;
}
send_break_locks();
return nullptr;
}
template <typename I>
void LockRequest<I>::send_break_locks() {
CephContext *cct = m_image_ctx.cct;
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << ", "
<< "num_lockers=" << m_lockers.size() << dendl;
librados::ObjectWriteOperation op;
for (auto &locker : m_lockers) {
rados::cls::lock::break_lock(&op, RBD_LOCK_NAME, locker.first.cookie,
locker.first.locker);
}
using klass = LockRequest<I>;
librados::AioCompletion *rados_completion =
create_rados_callback<klass, &klass::handle_break_locks>(this);
int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
template <typename I>
Context *LockRequest<I>::handle_break_locks(int *ret_val) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
m_broke_lock = true;
if (*ret_val == 0 || *ret_val == -ENOENT) {
send_lock();
return nullptr;
}
lderr(cct) << "failed to break object map lock: " << cpp_strerror(*ret_val)
<< dendl;
*ret_val = 0;
return m_on_finish;
}
} // namespace object_map
} // namespace librbd
template class librbd::object_map::LockRequest<librbd::ImageCtx>;
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