--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "SyncPointPruneRequest.h"
+#include "common/errno.h"
+#include "journal/Journaler.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Operations.h"
+#include "librbd/Utils.h"
+#include <set>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::image_sync::SyncPointPruneRequest: " \
+ << this << " " << __func__
+namespace rbd {
+namespace mirror {
+namespace image_sync {
+
+using librbd::util::create_context_callback;
+
+template <typename I>
+SyncPointPruneRequest<I>::SyncPointPruneRequest(I *remote_image_ctx,
+ bool sync_complete,
+ Journaler *journaler,
+ MirrorPeerClientMeta *client_meta,
+ Context *on_finish)
+ : m_remote_image_ctx(remote_image_ctx), m_sync_complete(sync_complete),
+ m_journaler(journaler), m_client_meta(client_meta), m_on_finish(on_finish),
+ m_client_meta_copy(*client_meta) {
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::send() {
+ if (m_client_meta->sync_points.empty()) {
+ send_remove_snap();
+ return;
+ }
+
+ if (m_sync_complete) {
+ // if sync is complete, we can remove the master sync point
+ auto it = m_client_meta_copy.sync_points.begin();
+ MirrorPeerSyncPoint &sync_point = *it;
+
+ ++it;
+ if (it == m_client_meta_copy.sync_points.end() ||
+ it->from_snap_name != sync_point.snap_name) {
+ m_snap_names.push_back(sync_point.snap_name);
+ }
+
+ if (!sync_point.from_snap_name.empty()) {
+ m_snap_names.push_back(sync_point.from_snap_name);
+ }
+ } else {
+ // if we have more than one sync point or invalid sync points,
+ // trim them off
+ RWLock::RLocker snap_locker(m_remote_image_ctx->snap_lock);
+ std::set<std::string> snap_names;
+ for (auto it = m_client_meta_copy.sync_points.rbegin();
+ it != m_client_meta_copy.sync_points.rend(); ++it) {
+ MirrorPeerSyncPoint &sync_point = *it;
+ if (&sync_point == &m_client_meta_copy.sync_points.front()) {
+ if (m_remote_image_ctx->get_snap_id(
+ cls::rbd::UserSnapshotNamespace(), sync_point.snap_name) ==
+ CEPH_NOSNAP) {
+ derr << ": failed to locate sync point snapshot: "
+ << sync_point.snap_name << dendl;
+ } else if (!sync_point.from_snap_name.empty()) {
+ derr << ": unexpected from_snap_name in primary sync point: "
+ << sync_point.from_snap_name << dendl;
+ } else {
+ // first sync point is OK -- keep it
+ break;
+ }
+ m_invalid_master_sync_point = true;
+ }
+
+ if (snap_names.count(sync_point.snap_name) == 0) {
+ snap_names.insert(sync_point.snap_name);
+ m_snap_names.push_back(sync_point.snap_name);
+ }
+
+ MirrorPeerSyncPoint &front_sync_point =
+ m_client_meta_copy.sync_points.front();
+ if (!sync_point.from_snap_name.empty() &&
+ snap_names.count(sync_point.from_snap_name) == 0 &&
+ sync_point.from_snap_name != front_sync_point.snap_name) {
+ snap_names.insert(sync_point.from_snap_name);
+ m_snap_names.push_back(sync_point.from_snap_name);
+ }
+ }
+ }
+
+ send_remove_snap();
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::send_remove_snap() {
+ if (m_snap_names.empty()) {
+ send_refresh_image();
+ return;
+ }
+
+ const std::string &snap_name = m_snap_names.front();
+
+ dout(20) << ": snap_name=" << snap_name << dendl;
+
+ Context *ctx = create_context_callback<
+ SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_remove_snap>(
+ this);
+ m_remote_image_ctx->operations->snap_remove(cls::rbd::UserSnapshotNamespace(),
+ snap_name.c_str(),
+ ctx);
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::handle_remove_snap(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ assert(!m_snap_names.empty());
+ std::string snap_name = m_snap_names.front();
+ m_snap_names.pop_front();
+
+ if (r == -ENOENT) {
+ r = 0;
+ }
+ if (r < 0) {
+ derr << ": failed to remove snapshot '" << snap_name << "': "
+ << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+
+ send_remove_snap();
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::send_refresh_image() {
+ dout(20) << dendl;
+
+ Context *ctx = create_context_callback<
+ SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_refresh_image>(
+ this);
+ m_remote_image_ctx->state->refresh(ctx);
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::handle_refresh_image(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ if (r < 0) {
+ derr << ": remote image refresh failed: " << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+
+ send_update_client();
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::send_update_client() {
+ dout(20) << dendl;
+
+ if (m_sync_complete) {
+ m_client_meta_copy.sync_points.pop_front();
+ if (m_client_meta_copy.sync_points.empty()) {
+ m_client_meta_copy.state = librbd::journal::MIRROR_PEER_STATE_REPLAYING;
+ }
+ } else {
+ while (m_client_meta_copy.sync_points.size() > 1) {
+ m_client_meta_copy.sync_points.pop_back();
+ }
+ if (m_invalid_master_sync_point) {
+ // all subsequent sync points would have been pruned
+ m_client_meta_copy.sync_points.clear();
+ }
+ }
+
+ bufferlist client_data_bl;
+ librbd::journal::ClientData client_data(m_client_meta_copy);
+ ::encode(client_data, client_data_bl);
+
+ Context *ctx = create_context_callback<
+ SyncPointPruneRequest<I>, &SyncPointPruneRequest<I>::handle_update_client>(
+ this);
+ m_journaler->update_client(client_data_bl, ctx);
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::handle_update_client(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ if (r < 0) {
+ derr << ": failed to update client data: " << cpp_strerror(r)
+ << dendl;
+ finish(r);
+ return;
+ }
+
+ // update provided meta structure to reflect reality
+ *m_client_meta = m_client_meta_copy;
+ finish(0);
+}
+
+template <typename I>
+void SyncPointPruneRequest<I>::finish(int r) {
+ dout(20) << ": r=" << r << dendl;
+
+ m_on_finish->complete(r);
+ delete this;
+}
+
+} // namespace image_sync
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::image_sync::SyncPointPruneRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff