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-rw-r--r--src/librbd/object_map/SnapshotRemoveRequest.cc227
1 files changed, 227 insertions, 0 deletions
diff --git a/src/librbd/object_map/SnapshotRemoveRequest.cc b/src/librbd/object_map/SnapshotRemoveRequest.cc
new file mode 100644
index 000000000..1c2ffc753
--- /dev/null
+++ b/src/librbd/object_map/SnapshotRemoveRequest.cc
@@ -0,0 +1,227 @@
+// -*- 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(ceph_mutex_is_locked(m_image_ctx.owner_lock));
+ ceph_assert(ceph_mutex_is_wlocked(m_image_ctx.image_lock));
+
+ 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;
+
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ std::unique_lock image_locker{m_image_ctx.image_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.
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ std::unique_lock image_locker{m_image_ctx.image_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, ClsLockType::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;
+
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ std::unique_lock image_locker{m_image_ctx.image_lock};
+ invalidate_next_map();
+ return;
+ }
+
+ std::shared_lock image_locker{m_image_ctx.image_lock};
+ update_object_map();
+ remove_map();
+}
+
+void SnapshotRemoveRequest::invalidate_next_map() {
+ ceph_assert(ceph_mutex_is_locked(m_image_ctx.owner_lock));
+ ceph_assert(ceph_mutex_is_wlocked(m_image_ctx.image_lock));
+
+ 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(ceph_mutex_is_locked(m_image_ctx.image_lock));
+
+ 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(ceph_mutex_is_locked(m_image_ctx.image_lock));
+ std::unique_lock object_map_locker{*m_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