--- /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