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-rw-r--r--src/librbd/object_map/SnapshotCreateRequest.cc147
1 files changed, 147 insertions, 0 deletions
diff --git a/src/librbd/object_map/SnapshotCreateRequest.cc b/src/librbd/object_map/SnapshotCreateRequest.cc
new file mode 100644
index 000000000..3b2e7ee82
--- /dev/null
+++ b/src/librbd/object_map/SnapshotCreateRequest.cc
@@ -0,0 +1,147 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/object_map/SnapshotCreateRequest.h"
+#include "common/dout.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ObjectMap.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::SnapshotCreateRequest: "
+
+namespace librbd {
+namespace object_map {
+
+namespace {
+
+std::ostream& operator<<(std::ostream& os,
+ const SnapshotCreateRequest::State& state) {
+ switch(state) {
+ case SnapshotCreateRequest::STATE_READ_MAP:
+ os << "READ_MAP";
+ break;
+ case SnapshotCreateRequest::STATE_WRITE_MAP:
+ os << "WRITE_MAP";
+ break;
+ case SnapshotCreateRequest::STATE_ADD_SNAPSHOT:
+ os << "ADD_SNAPSHOT";
+ break;
+ default:
+ os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
+ break;
+ }
+ return os;
+}
+
+} // anonymous namespace
+
+void SnapshotCreateRequest::send() {
+ send_read_map();
+}
+
+bool SnapshotCreateRequest::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;
+ }
+ if (m_ret_val < 0) {
+ // pass errors down to base class to invalidate the object map
+ return Request::should_complete(r);
+ }
+
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ bool finished = false;
+ switch (m_state) {
+ case STATE_READ_MAP:
+ send_write_map();
+ break;
+ case STATE_WRITE_MAP:
+ finished = send_add_snapshot();
+ break;
+ case STATE_ADD_SNAPSHOT:
+ update_object_map();
+ finished = true;
+ break;
+ default:
+ ceph_abort();
+ break;
+ }
+ return finished;
+}
+
+void SnapshotCreateRequest::send_read_map() {
+ ceph_assert(ceph_mutex_is_locked(m_image_ctx.image_lock));
+
+ CephContext *cct = m_image_ctx.cct;
+ std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
+ ldout(cct, 5) << this << " " << __func__ << ": oid=" << oid << dendl;
+ m_state = STATE_READ_MAP;
+
+ // IO is blocked due to the snapshot creation -- consistent to read from disk
+ 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(oid, rados_completion, &op,
+ &m_read_bl);
+ ceph_assert(r == 0);
+ rados_completion->release();
+}
+
+void SnapshotCreateRequest::send_write_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_WRITE_MAP;
+
+ librados::ObjectWriteOperation op;
+ 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();
+}
+
+bool SnapshotCreateRequest::send_add_snapshot() {
+ std::shared_lock image_locker{m_image_ctx.image_lock};
+ if ((m_image_ctx.features & RBD_FEATURE_FAST_DIFF) == 0) {
+ return true;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
+ ldout(cct, 5) << this << " " << __func__ << ": oid=" << oid << dendl;
+ m_state = STATE_ADD_SNAPSHOT;
+
+ librados::ObjectWriteOperation op;
+ rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, ClsLockType::EXCLUSIVE, "", "");
+ cls_client::object_map_snap_add(&op);
+
+ librados::AioCompletion *rados_completion = create_callback_completion();
+ int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
+ ceph_assert(r == 0);
+ rados_completion->release();
+ return false;
+}
+
+void SnapshotCreateRequest::update_object_map() {
+ std::unique_lock object_map_locker{*m_object_map_lock};
+
+ auto it = m_object_map.begin();
+ auto end_it = m_object_map.end();
+ for (; it != end_it; ++it) {
+ if (*it == OBJECT_EXISTS) {
+ *it = OBJECT_EXISTS_CLEAN;
+ }
+ }
+}
+
+} // namespace object_map
+} // namespace librbd