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-rw-r--r--src/librbd/object_map/SnapshotRollbackRequest.cc131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/librbd/object_map/SnapshotRollbackRequest.cc b/src/librbd/object_map/SnapshotRollbackRequest.cc
new file mode 100644
index 000000000..7c2f441cc
--- /dev/null
+++ b/src/librbd/object_map/SnapshotRollbackRequest.cc
@@ -0,0 +1,131 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/object_map/SnapshotRollbackRequest.h"
+#include "common/dout.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/object_map/InvalidateRequest.h"
+#include "cls/lock/cls_lock_client.h"
+#include <iostream>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::object_map::SnapshotRollbackRequest: "
+
+namespace librbd {
+namespace object_map {
+
+namespace {
+
+std::ostream& operator<<(std::ostream& os,
+ const SnapshotRollbackRequest::State& state) {
+ switch(state) {
+ case SnapshotRollbackRequest::STATE_READ_MAP:
+ os << "READ_MAP";
+ break;
+ case SnapshotRollbackRequest::STATE_INVALIDATE_MAP:
+ os << "INVALIDATE_MAP";
+ break;
+ case SnapshotRollbackRequest::STATE_WRITE_MAP:
+ os << "WRITE_MAP";
+ break;
+ default:
+ os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
+ break;
+ }
+ return os;
+}
+
+} // anonymous namespace
+
+void SnapshotRollbackRequest::send() {
+ send_read_map();
+}
+
+bool SnapshotRollbackRequest::should_complete(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
+ << "r=" << r << dendl;
+ if (r < 0 && m_ret_val == 0) {
+ m_ret_val = r;
+ }
+
+ bool finished = false;
+ switch (m_state) {
+ case STATE_READ_MAP:
+ if (r < 0) {
+ // invalidate the snapshot object map
+ send_invalidate_map();
+ } else {
+ send_write_map();
+ }
+ break;
+ case STATE_INVALIDATE_MAP:
+ // invalidate the HEAD object map as well
+ finished = Request::should_complete(m_ret_val);
+ break;
+ case STATE_WRITE_MAP:
+ finished = Request::should_complete(r);
+ break;
+ default:
+ ceph_abort();
+ break;
+ }
+ return finished;
+}
+
+void SnapshotRollbackRequest::send_read_map() {
+ std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid
+ << dendl;
+ m_state = STATE_READ_MAP;
+
+ librados::ObjectReadOperation op;
+ op.read(0, 0, NULL, NULL);
+
+ librados::AioCompletion *rados_completion = create_callback_completion();
+ int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op,
+ &m_read_bl);
+ ceph_assert(r == 0);
+ rados_completion->release();
+}
+
+void SnapshotRollbackRequest::send_write_map() {
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+
+ CephContext *cct = m_image_ctx.cct;
+ std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id,
+ CEPH_NOSNAP));
+ ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid
+ << dendl;
+ m_state = STATE_WRITE_MAP;
+
+ librados::ObjectWriteOperation op;
+ rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, ClsLockType::EXCLUSIVE, "", "");
+ op.write_full(m_read_bl);
+
+ librados::AioCompletion *rados_completion = create_callback_completion();
+ int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op);
+ ceph_assert(r == 0);
+ rados_completion->release();
+}
+
+void SnapshotRollbackRequest::send_invalidate_map() {
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ std::unique_lock image_locker{m_image_ctx.image_lock};
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_INVALIDATE_MAP;
+
+ InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx, m_snap_id,
+ false,
+ create_callback_context());
+ req->send();
+}
+
+} // namespace object_map
+} // namespace librbd