--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "ReplayStatusFormatter.h"
+#include "common/debug.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "journal/Journaler.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Journal.h"
+#include "librbd/Utils.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::image_replayer::ReplayStatusFormatter: " \
+ << this << " " << __func__ << ": "
+
+namespace rbd {
+namespace mirror {
+namespace image_replayer {
+
+using librbd::util::unique_lock_name;
+
+template <typename I>
+ReplayStatusFormatter<I>::ReplayStatusFormatter(Journaler *journaler,
+ const std::string &mirror_uuid)
+ : m_journaler(journaler),
+ m_mirror_uuid(mirror_uuid),
+ m_lock(unique_lock_name("ReplayStatusFormatter::m_lock", this)) {
+}
+
+template <typename I>
+bool ReplayStatusFormatter<I>::get_or_send_update(std::string *description,
+ Context *on_finish) {
+ dout(20) << dendl;
+
+ bool in_progress = false;
+ {
+ Mutex::Locker locker(m_lock);
+ if (m_on_finish) {
+ in_progress = true;
+ } else {
+ m_on_finish = on_finish;
+ }
+ }
+
+ if (in_progress) {
+ dout(10) << "previous request is still in progress, ignoring" << dendl;
+ on_finish->complete(-EAGAIN);
+ return false;
+ }
+
+ m_master_position = cls::journal::ObjectPosition();
+ m_mirror_position = cls::journal::ObjectPosition();
+
+ cls::journal::Client master_client, mirror_client;
+ int r;
+
+ r = m_journaler->get_cached_client(librbd::Journal<>::IMAGE_CLIENT_ID,
+ &master_client);
+ if (r < 0) {
+ derr << "error retrieving registered master client: "
+ << cpp_strerror(r) << dendl;
+ } else {
+ r = m_journaler->get_cached_client(m_mirror_uuid, &mirror_client);
+ if (r < 0) {
+ derr << "error retrieving registered mirror client: "
+ << cpp_strerror(r) << dendl;
+ }
+ }
+
+ if (!master_client.commit_position.object_positions.empty()) {
+ m_master_position =
+ *(master_client.commit_position.object_positions.begin());
+ }
+
+ if (!mirror_client.commit_position.object_positions.empty()) {
+ m_mirror_position =
+ *(mirror_client.commit_position.object_positions.begin());
+ }
+
+ if (!calculate_behind_master_or_send_update()) {
+ dout(20) << "need to update tag cache" << dendl;
+ return false;
+ }
+
+ format(description);
+
+ {
+ Mutex::Locker locker(m_lock);
+ assert(m_on_finish == on_finish);
+ m_on_finish = nullptr;
+ }
+
+ on_finish->complete(-EEXIST);
+ return true;
+}
+
+template <typename I>
+bool ReplayStatusFormatter<I>::calculate_behind_master_or_send_update() {
+ dout(20) << "m_master_position=" << m_master_position
+ << ", m_mirror_position=" << m_mirror_position << dendl;
+
+ m_entries_behind_master = 0;
+
+ if (m_master_position == cls::journal::ObjectPosition() ||
+ m_master_position.tag_tid < m_mirror_position.tag_tid) {
+ return true;
+ }
+
+ cls::journal::ObjectPosition master = m_master_position;
+ uint64_t mirror_tag_tid = m_mirror_position.tag_tid;
+
+ while (master.tag_tid != mirror_tag_tid) {
+ auto tag_it = m_tag_cache.find(master.tag_tid);
+ if (tag_it == m_tag_cache.end()) {
+ send_update_tag_cache(master.tag_tid, mirror_tag_tid);
+ return false;
+ }
+ librbd::journal::TagData &tag_data = tag_it->second;
+ m_entries_behind_master += master.entry_tid;
+ master = cls::journal::ObjectPosition(0, tag_data.predecessor.tag_tid,
+ tag_data.predecessor.entry_tid);
+ }
+ m_entries_behind_master += master.entry_tid - m_mirror_position.entry_tid;
+
+ dout(20) << "clearing tags not needed any more (below mirror position)"
+ << dendl;
+
+ uint64_t tag_tid = mirror_tag_tid;
+ size_t old_size = m_tag_cache.size();
+ while (tag_tid != 0) {
+ auto tag_it = m_tag_cache.find(tag_tid);
+ if (tag_it == m_tag_cache.end()) {
+ break;
+ }
+ librbd::journal::TagData &tag_data = tag_it->second;
+
+ dout(20) << "erasing tag " << tag_data << "for tag_tid " << tag_tid
+ << dendl;
+
+ tag_tid = tag_data.predecessor.tag_tid;
+ m_tag_cache.erase(tag_it);
+ }
+
+ dout(20) << old_size - m_tag_cache.size() << " entries cleared" << dendl;
+
+ return true;
+}
+
+template <typename I>
+void ReplayStatusFormatter<I>::send_update_tag_cache(uint64_t master_tag_tid,
+ uint64_t mirror_tag_tid) {
+
+ dout(20) << "master_tag_tid=" << master_tag_tid << ", mirror_tag_tid="
+ << mirror_tag_tid << dendl;
+
+ if (master_tag_tid == mirror_tag_tid) {
+ Context *on_finish = nullptr;
+ {
+ Mutex::Locker locker(m_lock);
+ std::swap(m_on_finish, on_finish);
+ }
+
+ assert(on_finish);
+ on_finish->complete(0);
+ return;
+ }
+
+ FunctionContext *ctx = new FunctionContext(
+ [this, master_tag_tid, mirror_tag_tid](int r) {
+ handle_update_tag_cache(master_tag_tid, mirror_tag_tid, r);
+ });
+ m_journaler->get_tag(master_tag_tid, &m_tag, ctx);
+}
+
+template <typename I>
+void ReplayStatusFormatter<I>::handle_update_tag_cache(uint64_t master_tag_tid,
+ uint64_t mirror_tag_tid,
+ int r) {
+ librbd::journal::TagData tag_data;
+
+ if (r < 0) {
+ derr << "error retrieving tag " << master_tag_tid << ": " << cpp_strerror(r)
+ << dendl;
+ } else {
+ dout(20) << "retrieved tag " << master_tag_tid << ": " << m_tag << dendl;
+
+ bufferlist::iterator it = m_tag.data.begin();
+ try {
+ ::decode(tag_data, it);
+ } catch (const buffer::error &err) {
+ derr << "error decoding tag " << master_tag_tid << ": " << err.what()
+ << dendl;
+ }
+ }
+
+ if (tag_data.predecessor.mirror_uuid !=
+ librbd::Journal<>::LOCAL_MIRROR_UUID &&
+ tag_data.predecessor.mirror_uuid !=
+ librbd::Journal<>::ORPHAN_MIRROR_UUID) {
+ dout(20) << "hit remote image non-primary epoch" << dendl;
+ tag_data.predecessor.tag_tid = mirror_tag_tid;
+ } else if (tag_data.predecessor.tag_tid == 0) {
+ // We failed. Don't consider this fatal, just terminate retrieving.
+ dout(20) << "making fake tag" << dendl;
+ tag_data.predecessor.tag_tid = mirror_tag_tid;
+ }
+
+ dout(20) << "decoded tag " << master_tag_tid << ": " << tag_data << dendl;
+
+ m_tag_cache.insert(std::make_pair(master_tag_tid, tag_data));
+ send_update_tag_cache(tag_data.predecessor.tag_tid, mirror_tag_tid);
+}
+
+template <typename I>
+void ReplayStatusFormatter<I>::format(std::string *description) {
+
+ dout(20) << "m_master_position=" << m_master_position
+ << ", m_mirror_position=" << m_mirror_position
+ << ", m_entries_behind_master=" << m_entries_behind_master << dendl;
+
+ std::stringstream ss;
+ ss << "master_position=";
+ if (m_master_position == cls::journal::ObjectPosition()) {
+ ss << "[]";
+ } else {
+ ss << m_master_position;
+ }
+ ss << ", mirror_position=";
+ if (m_mirror_position == cls::journal::ObjectPosition()) {
+ ss << "[]";
+ } else {
+ ss << m_mirror_position;
+ }
+ ss << ", entries_behind_master="
+ << (m_entries_behind_master > 0 ? m_entries_behind_master : 0);
+
+ *description = ss.str();
+}
+
+} // namespace image_replayer
+} // namespace mirror
+} // namespace rbd
+
+template class
+rbd::mirror::image_replayer::ReplayStatusFormatter<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff