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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "EventPreprocessor.h"
#include "common/debug.h"
#include "common/dout.h"
#include "common/errno.h"
#include "journal/Journaler.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/Utils.h"
#include "librbd/asio/ContextWQ.h"
#include "librbd/journal/Types.h"
#include <boost/variant.hpp>
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd_mirror
#undef dout_prefix
#define dout_prefix *_dout << "rbd::mirror::image_replayer::journal::" \
<< "EventPreprocessor: " << this << " " << __func__ \
<< ": "
namespace rbd {
namespace mirror {
namespace image_replayer {
namespace journal {
using librbd::util::create_context_callback;
template <typename I>
EventPreprocessor<I>::EventPreprocessor(I &local_image_ctx,
Journaler &remote_journaler,
const std::string &local_mirror_uuid,
MirrorPeerClientMeta *client_meta,
librbd::asio::ContextWQ *work_queue)
: m_local_image_ctx(local_image_ctx), m_remote_journaler(remote_journaler),
m_local_mirror_uuid(local_mirror_uuid), m_client_meta(client_meta),
m_work_queue(work_queue) {
}
template <typename I>
EventPreprocessor<I>::~EventPreprocessor() {
ceph_assert(!m_in_progress);
}
template <typename I>
bool EventPreprocessor<I>::is_required(const EventEntry &event_entry) {
SnapSeqs snap_seqs(m_client_meta->snap_seqs);
return (prune_snap_map(&snap_seqs) ||
event_entry.get_event_type() ==
librbd::journal::EVENT_TYPE_SNAP_RENAME);
}
template <typename I>
void EventPreprocessor<I>::preprocess(EventEntry *event_entry,
Context *on_finish) {
ceph_assert(!m_in_progress);
m_in_progress = true;
m_event_entry = event_entry;
m_on_finish = on_finish;
refresh_image();
}
template <typename I>
void EventPreprocessor<I>::refresh_image() {
dout(20) << dendl;
Context *ctx = create_context_callback<
EventPreprocessor<I>, &EventPreprocessor<I>::handle_refresh_image>(this);
m_local_image_ctx.state->refresh(ctx);
}
template <typename I>
void EventPreprocessor<I>::handle_refresh_image(int r) {
dout(20) << "r=" << r << dendl;
if (r < 0) {
derr << "error encountered during image refresh: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
preprocess_event();
}
template <typename I>
void EventPreprocessor<I>::preprocess_event() {
dout(20) << dendl;
m_snap_seqs = m_client_meta->snap_seqs;
m_snap_seqs_updated = prune_snap_map(&m_snap_seqs);
int r = boost::apply_visitor(PreprocessEventVisitor(this),
m_event_entry->event);
if (r < 0) {
finish(r);
return;
}
update_client();
}
template <typename I>
int EventPreprocessor<I>::preprocess_snap_rename(
librbd::journal::SnapRenameEvent &event) {
dout(20) << "remote_snap_id=" << event.snap_id << ", "
<< "src_snap_name=" << event.src_snap_name << ", "
<< "dest_snap_name=" << event.dst_snap_name << dendl;
auto snap_seq_it = m_snap_seqs.find(event.snap_id);
if (snap_seq_it != m_snap_seqs.end()) {
dout(20) << "remapping remote snap id " << snap_seq_it->first << " "
<< "to local snap id " << snap_seq_it->second << dendl;
event.snap_id = snap_seq_it->second;
return 0;
}
auto snap_id_it = m_local_image_ctx.snap_ids.find({cls::rbd::UserSnapshotNamespace(),
event.src_snap_name});
if (snap_id_it == m_local_image_ctx.snap_ids.end()) {
dout(20) << "cannot map remote snapshot '" << event.src_snap_name << "' "
<< "to local snapshot" << dendl;
event.snap_id = CEPH_NOSNAP;
return -ENOENT;
}
dout(20) << "mapping remote snap id " << event.snap_id << " "
<< "to local snap id " << snap_id_it->second << dendl;
m_snap_seqs_updated = true;
m_snap_seqs[event.snap_id] = snap_id_it->second;
event.snap_id = snap_id_it->second;
return 0;
}
template <typename I>
void EventPreprocessor<I>::update_client() {
if (!m_snap_seqs_updated) {
finish(0);
return;
}
dout(20) << dendl;
librbd::journal::MirrorPeerClientMeta client_meta(*m_client_meta);
client_meta.snap_seqs = m_snap_seqs;
librbd::journal::ClientData client_data(client_meta);
bufferlist data_bl;
encode(client_data, data_bl);
Context *ctx = create_context_callback<
EventPreprocessor<I>, &EventPreprocessor<I>::handle_update_client>(
this);
m_remote_journaler.update_client(data_bl, ctx);
}
template <typename I>
void EventPreprocessor<I>::handle_update_client(int r) {
dout(20) << "r=" << r << dendl;
if (r < 0) {
derr << "failed to update mirror peer journal client: "
<< cpp_strerror(r) << dendl;
finish(r);
return;
}
m_client_meta->snap_seqs = m_snap_seqs;
finish(0);
}
template <typename I>
bool EventPreprocessor<I>::prune_snap_map(SnapSeqs *snap_seqs) {
bool pruned = false;
std::shared_lock image_locker{m_local_image_ctx.image_lock};
for (auto it = snap_seqs->begin(); it != snap_seqs->end(); ) {
auto current_it(it++);
if (m_local_image_ctx.snap_info.count(current_it->second) == 0) {
snap_seqs->erase(current_it);
pruned = true;
}
}
return pruned;
}
template <typename I>
void EventPreprocessor<I>::finish(int r) {
dout(20) << "r=" << r << dendl;
Context *on_finish = m_on_finish;
m_on_finish = nullptr;
m_event_entry = nullptr;
m_in_progress = false;
m_snap_seqs_updated = false;
m_work_queue->queue(on_finish, r);
}
} // namespace journal
} // namespace image_replayer
} // namespace mirror
} // namespace rbd
template class rbd::mirror::image_replayer::journal::EventPreprocessor<librbd::ImageCtx>;
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