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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/SnapshotRemoveRequest.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/ObjectMap.h"
#include "librbd/object_map/InvalidateRequest.h"
#include "cls/lock/cls_lock_client.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::object_map::SnapshotRemoveRequest: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace object_map {
void SnapshotRemoveRequest::send() {
ceph_assert(m_image_ctx.owner_lock.is_locked());
ceph_assert(m_image_ctx.snap_lock.is_wlocked());
if ((m_image_ctx.features & RBD_FEATURE_FAST_DIFF) != 0) {
int r = m_image_ctx.get_flags(m_snap_id, &m_flags);
ceph_assert(r == 0);
compute_next_snap_id();
load_map();
} else {
remove_map();
}
}
void SnapshotRemoveRequest::load_map() {
CephContext *cct = m_image_ctx.cct;
std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
ldout(cct, 5) << "snap_oid=" << snap_oid << dendl;
librados::ObjectReadOperation op;
cls_client::object_map_load_start(&op);
auto rados_completion = librbd::util::create_rados_callback<
SnapshotRemoveRequest, &SnapshotRemoveRequest::handle_load_map>(this);
int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op,
&m_out_bl);
ceph_assert(r == 0);
rados_completion->release();
}
void SnapshotRemoveRequest::handle_load_map(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r == 0) {
auto it = m_out_bl.cbegin();
r = cls_client::object_map_load_finish(&it, &m_snap_object_map);
}
if (r == -ENOENT) {
// implies we have already deleted this snapshot and handled the
// necessary fast-diff cleanup
complete(0);
return;
} else if (r < 0) {
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
lderr(cct) << "failed to load object map " << oid << ": "
<< cpp_strerror(r) << dendl;
RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
invalidate_next_map();
return;
}
remove_snapshot();
}
void SnapshotRemoveRequest::remove_snapshot() {
if ((m_flags & RBD_FLAG_OBJECT_MAP_INVALID) != 0) {
// snapshot object map exists on disk but is invalid. cannot clean fast-diff
// on next snapshot if current snapshot was invalid.
RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
invalidate_next_map();
return;
}
CephContext *cct = m_image_ctx.cct;
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_next_snap_id));
ldout(cct, 5) << "oid=" << oid << dendl;
librados::ObjectWriteOperation op;
if (m_next_snap_id == CEPH_NOSNAP) {
rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
}
cls_client::object_map_snap_remove(&op, m_snap_object_map);
auto rados_completion = librbd::util::create_rados_callback<
SnapshotRemoveRequest,
&SnapshotRemoveRequest::handle_remove_snapshot>(this);
int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
void SnapshotRemoveRequest::handle_remove_snapshot(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id,
m_next_snap_id));
lderr(cct) << "failed to remove object map snapshot " << oid << ": "
<< cpp_strerror(r) << dendl;
RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
invalidate_next_map();
return;
}
RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
update_object_map();
remove_map();
}
void SnapshotRemoveRequest::invalidate_next_map() {
ceph_assert(m_image_ctx.owner_lock.is_locked());
ceph_assert(m_image_ctx.snap_lock.is_wlocked());
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << dendl;
auto ctx = librbd::util::create_context_callback<
SnapshotRemoveRequest,
&SnapshotRemoveRequest::handle_invalidate_next_map>(this);
InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx,
m_next_snap_id, true, ctx);
req->send();
}
void SnapshotRemoveRequest::handle_invalidate_next_map(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r < 0) {
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id,
m_next_snap_id));
lderr(cct) << "failed to invalidate object map " << oid << ": "
<< cpp_strerror(r) << dendl;
complete(r);
return;
}
remove_map();
}
void SnapshotRemoveRequest::remove_map() {
CephContext *cct = m_image_ctx.cct;
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
ldout(cct, 5) << "oid=" << oid << dendl;
librados::ObjectWriteOperation op;
op.remove();
auto rados_completion = librbd::util::create_rados_callback<
SnapshotRemoveRequest, &SnapshotRemoveRequest::handle_remove_map>(this);
int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
ceph_assert(r == 0);
rados_completion->release();
}
void SnapshotRemoveRequest::handle_remove_map(int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << "r=" << r << dendl;
if (r < 0 && r != -ENOENT) {
std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
lderr(cct) << "failed to remove object map " << oid << ": "
<< cpp_strerror(r) << dendl;
complete(r);
return;
}
complete(0);
}
void SnapshotRemoveRequest::compute_next_snap_id() {
ceph_assert(m_image_ctx.snap_lock.is_locked());
m_next_snap_id = CEPH_NOSNAP;
std::map<librados::snap_t, SnapInfo>::const_iterator it =
m_image_ctx.snap_info.find(m_snap_id);
ceph_assert(it != m_image_ctx.snap_info.end());
++it;
if (it != m_image_ctx.snap_info.end()) {
m_next_snap_id = it->first;
}
}
void SnapshotRemoveRequest::update_object_map() {
assert(m_image_ctx.snap_lock.is_locked());
RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
if (m_next_snap_id == m_image_ctx.snap_id && m_next_snap_id == CEPH_NOSNAP) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << dendl;
auto it = m_object_map.begin();
auto end_it = m_object_map.end();
auto snap_it = m_snap_object_map.begin();
uint64_t i = 0;
for (; it != end_it; ++it) {
if (*it == OBJECT_EXISTS_CLEAN &&
(i >= m_snap_object_map.size() ||
*snap_it == OBJECT_EXISTS)) {
*it = OBJECT_EXISTS;
}
if (i < m_snap_object_map.size()) {
++snap_it;
}
++i;
}
}
}
} // namespace object_map
} // namespace librbd
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