+++ /dev/null
-// -*- 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: "
-
-namespace librbd {
-namespace object_map {
-
-namespace {
-
-std::ostream& operator<<(std::ostream& os,
- const SnapshotRemoveRequest::State& state) {
- switch(state) {
- case SnapshotRemoveRequest::STATE_LOAD_MAP:
- os << "LOAD_MAP";
- break;
- case SnapshotRemoveRequest::STATE_REMOVE_SNAPSHOT:
- os << "REMOVE_SNAPSHOT";
- break;
- case SnapshotRemoveRequest::STATE_INVALIDATE_NEXT_MAP:
- os << "INVALIDATE_NEXT_MAP";
- break;
- case SnapshotRemoveRequest::STATE_REMOVE_MAP:
- os << "REMOVE_MAP";
- break;
- default:
- os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
- break;
- }
- return os;
-}
-
-} // anonymous namespace
-
-void SnapshotRemoveRequest::send() {
- assert(m_image_ctx.owner_lock.is_locked());
- assert(m_image_ctx.snap_lock.is_wlocked());
-
- if ((m_image_ctx.features & RBD_FEATURE_FAST_DIFF) != 0) {
- compute_next_snap_id();
-
- uint64_t flags;
- int r = m_image_ctx.get_flags(m_snap_id, &flags);
- assert(r == 0);
-
- if ((flags & RBD_FLAG_OBJECT_MAP_INVALID) != 0) {
- send_invalidate_next_map();
- } else {
- send_load_map();
- }
- } else {
- send_remove_map();
- }
-}
-
-bool SnapshotRemoveRequest::should_complete(int r) {
- CephContext *cct = m_image_ctx.cct;
- ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
- << "r=" << r << dendl;
-
- RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
- bool finished = false;
- switch (m_state) {
- case STATE_LOAD_MAP:
- if (r == -ENOENT) {
- finished = true;
- break;
- }
-
- if (r == 0) {
- bufferlist::iterator it = m_out_bl.begin();
- r = cls_client::object_map_load_finish(&it, &m_snap_object_map);
- }
- if (r < 0) {
- RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
- send_invalidate_next_map();
- } else {
- send_remove_snapshot();
- }
- break;
- case STATE_REMOVE_SNAPSHOT:
- if (r < 0 && r != -ENOENT) {
- RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
- send_invalidate_next_map();
- } else {
- update_object_map();
- send_remove_map();
- }
- break;
- case STATE_INVALIDATE_NEXT_MAP:
- send_remove_map();
- break;
- case STATE_REMOVE_MAP:
- finished = true;
- break;
- default:
- assert(false);
- break;
- }
- return finished;
-}
-
-void SnapshotRemoveRequest::send_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) << this << " " << __func__ << ": snap_oid=" << snap_oid
- << dendl;
- m_state = STATE_LOAD_MAP;
-
- librados::ObjectReadOperation op;
- cls_client::object_map_load_start(&op);
-
- librados::AioCompletion *rados_completion = create_callback_completion();
- int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op,
- &m_out_bl);
- assert(r == 0);
- rados_completion->release();
-}
-
-void SnapshotRemoveRequest::send_remove_snapshot() {
- CephContext *cct = m_image_ctx.cct;
- std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_next_snap_id));
- ldout(cct, 5) << this << " " << __func__ << ": oid=" << oid << dendl;
- m_state = STATE_REMOVE_SNAPSHOT;
-
- 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);
-
- librados::AioCompletion *rados_completion = create_callback_completion();
- int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
- assert(r == 0);
- rados_completion->release();
-}
-
-void SnapshotRemoveRequest::send_invalidate_next_map() {
- assert(m_image_ctx.owner_lock.is_locked());
- assert(m_image_ctx.snap_lock.is_wlocked());
-
- CephContext *cct = m_image_ctx.cct;
- ldout(cct, 5) << this << " " << __func__ << dendl;
- m_state = STATE_INVALIDATE_NEXT_MAP;
-
- InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx,
- m_next_snap_id, true,
- create_callback_context());
- req->send();
-}
-
-void SnapshotRemoveRequest::send_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) << this << " " << __func__ << ": oid=" << oid << dendl;
- m_state = STATE_REMOVE_MAP;
-
- librados::ObjectWriteOperation op;
- op.remove();
-
- librados::AioCompletion *rados_completion = create_callback_completion();
- int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
- assert(r == 0);
- rados_completion->release();
-}
-
-void SnapshotRemoveRequest::compute_next_snap_id() {
- 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);
- 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() {
- RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
- 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) << this << " " << __func__ << dendl;
-
- for (uint64_t i = 0; i < m_object_map.size(); ++i) {
- if (m_object_map[i] == OBJECT_EXISTS_CLEAN &&
- (i >= m_snap_object_map.size() ||
- m_snap_object_map[i] == OBJECT_EXISTS)) {
- m_object_map[i] = OBJECT_EXISTS;
- }
- }
- }
-}
-
-} // namespace object_map
-} // namespace librbd
Code Review / stor4nfv.git / blobdiff