+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "journal/JournalPlayer.h"
-#include "journal/Entry.h"
-#include "journal/ReplayHandler.h"
-#include "journal/Utils.h"
-
-#define dout_subsys ceph_subsys_journaler
-#undef dout_prefix
-#define dout_prefix *_dout << "JournalPlayer: " << this << " "
-
-namespace journal {
-
-namespace {
-
-struct C_HandleComplete : public Context {
- ReplayHandler *replay_handler;
-
- explicit C_HandleComplete(ReplayHandler *_replay_handler)
- : replay_handler(_replay_handler) {
- replay_handler->get();
- }
- ~C_HandleComplete() override {
- replay_handler->put();
- }
- void finish(int r) override {
- replay_handler->handle_complete(r);
- }
-};
-
-struct C_HandleEntriesAvailable : public Context {
- ReplayHandler *replay_handler;
-
- explicit C_HandleEntriesAvailable(ReplayHandler *_replay_handler)
- : replay_handler(_replay_handler) {
- replay_handler->get();
- }
- ~C_HandleEntriesAvailable() override {
- replay_handler->put();
- }
- void finish(int r) override {
- replay_handler->handle_entries_available();
- }
-};
-
-} // anonymous namespace
-
-JournalPlayer::JournalPlayer(librados::IoCtx &ioctx,
- const std::string &object_oid_prefix,
- const JournalMetadataPtr& journal_metadata,
- ReplayHandler *replay_handler)
- : m_cct(NULL), m_object_oid_prefix(object_oid_prefix),
- m_journal_metadata(journal_metadata), m_replay_handler(replay_handler),
- m_lock("JournalPlayer::m_lock"), m_state(STATE_INIT), m_splay_offset(0),
- m_watch_enabled(false), m_watch_scheduled(false), m_watch_interval(0) {
- m_replay_handler->get();
- m_ioctx.dup(ioctx);
- m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
-
- ObjectSetPosition commit_position;
- m_journal_metadata->get_commit_position(&commit_position);
-
- if (!commit_position.object_positions.empty()) {
- ldout(m_cct, 5) << "commit position: " << commit_position << dendl;
-
- // start replay after the last committed entry's object
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- auto &active_position = commit_position.object_positions.front();
- m_active_tag_tid = active_position.tag_tid;
- m_commit_position_valid = true;
- m_commit_position = active_position;
- m_splay_offset = active_position.object_number % splay_width;
- for (auto &position : commit_position.object_positions) {
- uint8_t splay_offset = position.object_number % splay_width;
- m_commit_positions[splay_offset] = position;
- }
- }
-}
-
-JournalPlayer::~JournalPlayer() {
- assert(m_async_op_tracker.empty());
- {
- Mutex::Locker locker(m_lock);
- assert(m_shut_down);
- assert(m_fetch_object_numbers.empty());
- assert(!m_watch_scheduled);
- }
- m_replay_handler->put();
-}
-
-void JournalPlayer::prefetch() {
- Mutex::Locker locker(m_lock);
- assert(m_state == STATE_INIT);
- m_state = STATE_PREFETCH;
-
- m_active_set = m_journal_metadata->get_active_set();
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- for (uint8_t splay_offset = 0; splay_offset < splay_width; ++splay_offset) {
- m_prefetch_splay_offsets.insert(splay_offset);
- }
-
- // compute active object for each splay offset (might be before
- // active set)
- std::map<uint8_t, uint64_t> splay_offset_to_objects;
- for (auto &position : m_commit_positions) {
- assert(splay_offset_to_objects.count(position.first) == 0);
- splay_offset_to_objects[position.first] = position.second.object_number;
- }
-
- // prefetch the active object for each splay offset
- std::set<uint64_t> prefetch_object_numbers;
- for (uint8_t splay_offset = 0; splay_offset < splay_width; ++splay_offset) {
- uint64_t object_number = splay_offset;
- if (splay_offset_to_objects.count(splay_offset) != 0) {
- object_number = splay_offset_to_objects[splay_offset];
- }
-
- prefetch_object_numbers.insert(object_number);
- }
-
- ldout(m_cct, 10) << __func__ << ": prefetching "
- << prefetch_object_numbers.size() << " " << "objects"
- << dendl;
- for (auto object_number : prefetch_object_numbers) {
- fetch(object_number);
- }
-}
-
-void JournalPlayer::prefetch_and_watch(double interval) {
- {
- Mutex::Locker locker(m_lock);
- m_watch_enabled = true;
- m_watch_interval = interval;
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
- }
- prefetch();
-}
-
-void JournalPlayer::shut_down(Context *on_finish) {
- ldout(m_cct, 20) << __func__ << dendl;
- Mutex::Locker locker(m_lock);
-
- assert(!m_shut_down);
- m_shut_down = true;
- m_watch_enabled = false;
-
- on_finish = utils::create_async_context_callback(
- m_journal_metadata, on_finish);
-
- if (m_watch_scheduled) {
- ObjectPlayerPtr object_player = get_object_player();
- switch (m_watch_step) {
- case WATCH_STEP_FETCH_FIRST:
- object_player = m_object_players.begin()->second;
- // fallthrough
- case WATCH_STEP_FETCH_CURRENT:
- object_player->unwatch();
- break;
- case WATCH_STEP_ASSERT_ACTIVE:
- break;
- }
- }
-
- m_async_op_tracker.wait_for_ops(on_finish);
-}
-
-bool JournalPlayer::try_pop_front(Entry *entry, uint64_t *commit_tid) {
- ldout(m_cct, 20) << __func__ << dendl;
- Mutex::Locker locker(m_lock);
-
- if (m_state != STATE_PLAYBACK) {
- m_handler_notified = false;
- return false;
- }
-
- if (!verify_playback_ready()) {
- if (!is_object_set_ready()) {
- m_handler_notified = false;
- } else {
- refetch(true);
- }
- return false;
- }
-
- ObjectPlayerPtr object_player = get_object_player();
- assert(object_player && !object_player->empty());
-
- object_player->front(entry);
- object_player->pop_front();
-
- uint64_t last_entry_tid;
- if (m_journal_metadata->get_last_allocated_entry_tid(
- entry->get_tag_tid(), &last_entry_tid) &&
- entry->get_entry_tid() != last_entry_tid + 1) {
- lderr(m_cct) << "missing prior journal entry: " << *entry << dendl;
-
- m_state = STATE_ERROR;
- notify_complete(-ENOMSG);
- return false;
- }
-
- advance_splay_object();
- remove_empty_object_player(object_player);
-
- m_journal_metadata->reserve_entry_tid(entry->get_tag_tid(),
- entry->get_entry_tid());
- *commit_tid = m_journal_metadata->allocate_commit_tid(
- object_player->get_object_number(), entry->get_tag_tid(),
- entry->get_entry_tid());
- return true;
-}
-
-void JournalPlayer::process_state(uint64_t object_number, int r) {
- ldout(m_cct, 10) << __func__ << ": object_num=" << object_number << ", "
- << "r=" << r << dendl;
-
- assert(m_lock.is_locked());
- if (r >= 0) {
- switch (m_state) {
- case STATE_PREFETCH:
- ldout(m_cct, 10) << "PREFETCH" << dendl;
- r = process_prefetch(object_number);
- break;
- case STATE_PLAYBACK:
- ldout(m_cct, 10) << "PLAYBACK" << dendl;
- r = process_playback(object_number);
- break;
- case STATE_ERROR:
- ldout(m_cct, 10) << "ERROR" << dendl;
- break;
- default:
- lderr(m_cct) << "UNEXPECTED STATE (" << m_state << ")" << dendl;
- assert(false);
- break;
- }
- }
-
- if (r < 0) {
- m_state = STATE_ERROR;
- notify_complete(r);
- }
-}
-
-int JournalPlayer::process_prefetch(uint64_t object_number) {
- ldout(m_cct, 10) << __func__ << ": object_num=" << object_number << dendl;
- assert(m_lock.is_locked());
-
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- uint8_t splay_offset = object_number % splay_width;
-
- PrefetchSplayOffsets::iterator it = m_prefetch_splay_offsets.find(
- splay_offset);
- if (it == m_prefetch_splay_offsets.end()) {
- return 0;
- }
-
- bool prefetch_complete = false;
- assert(m_object_players.count(splay_offset) == 1);
- ObjectPlayerPtr object_player = m_object_players[splay_offset];
-
- // prefetch in-order since a newer splay object could prefetch first
- if (m_fetch_object_numbers.count(object_player->get_object_number()) == 0) {
- // skip past known committed records
- if (m_commit_positions.count(splay_offset) != 0 &&
- !object_player->empty()) {
- ObjectPosition &position = m_commit_positions[splay_offset];
-
- ldout(m_cct, 15) << "seeking known commit position " << position << " in "
- << object_player->get_oid() << dendl;
-
- bool found_commit = false;
- Entry entry;
- while (!object_player->empty()) {
- object_player->front(&entry);
-
- if (entry.get_tag_tid() == position.tag_tid &&
- entry.get_entry_tid() == position.entry_tid) {
- found_commit = true;
- } else if (found_commit) {
- ldout(m_cct, 10) << "located next uncommitted entry: " << entry
- << dendl;
- break;
- }
-
- ldout(m_cct, 20) << "skipping committed entry: " << entry << dendl;
- m_journal_metadata->reserve_entry_tid(entry.get_tag_tid(),
- entry.get_entry_tid());
- object_player->pop_front();
- }
-
- // do not search for commit position for this object
- // if we've already seen it
- if (found_commit) {
- m_commit_positions.erase(splay_offset);
- }
- }
-
- // if the object is empty, pre-fetch the next splay object
- if (object_player->empty() && object_player->refetch_required()) {
- ldout(m_cct, 10) << "refetching potentially partially decoded object"
- << dendl;
- object_player->set_refetch_state(ObjectPlayer::REFETCH_STATE_NONE);
- fetch(object_player);
- } else if (!remove_empty_object_player(object_player)) {
- ldout(m_cct, 10) << "prefetch of object complete" << dendl;
- prefetch_complete = true;
- }
- }
-
- if (!prefetch_complete) {
- return 0;
- }
-
- m_prefetch_splay_offsets.erase(it);
- if (!m_prefetch_splay_offsets.empty()) {
- return 0;
- }
-
- ldout(m_cct, 10) << "switching to playback mode" << dendl;
- m_state = STATE_PLAYBACK;
-
- // if we have a valid commit position, our read should start with
- // the next consistent journal entry in the sequence
- if (m_commit_position_valid) {
- splay_offset = m_commit_position.object_number % splay_width;
- object_player = m_object_players[splay_offset];
-
- if (object_player->empty()) {
- if (!object_player->refetch_required()) {
- advance_splay_object();
- }
- } else {
- Entry entry;
- object_player->front(&entry);
- if (entry.get_tag_tid() == m_commit_position.tag_tid) {
- advance_splay_object();
- }
- }
- }
-
- if (verify_playback_ready()) {
- notify_entries_available();
- } else if (is_object_set_ready()) {
- refetch(false);
- }
- return 0;
-}
-
-int JournalPlayer::process_playback(uint64_t object_number) {
- ldout(m_cct, 10) << __func__ << ": object_num=" << object_number << dendl;
- assert(m_lock.is_locked());
-
- if (verify_playback_ready()) {
- notify_entries_available();
- } else if (is_object_set_ready()) {
- refetch(false);
- }
- return 0;
-}
-
-bool JournalPlayer::is_object_set_ready() const {
- assert(m_lock.is_locked());
- if (m_watch_scheduled || !m_fetch_object_numbers.empty()) {
- ldout(m_cct, 20) << __func__ << ": waiting for in-flight fetch" << dendl;
- return false;
- }
-
- return true;
-}
-
-bool JournalPlayer::verify_playback_ready() {
- assert(m_lock.is_locked());
-
- while (true) {
- if (!is_object_set_ready()) {
- ldout(m_cct, 10) << __func__ << ": waiting for full object set" << dendl;
- return false;
- }
-
- ObjectPlayerPtr object_player = get_object_player();
- assert(object_player);
- uint64_t object_num = object_player->get_object_number();
-
- // Verify is the active object player has another entry available
- // in the sequence
- // NOTE: replay currently does not check tag class to playback multiple tags
- // from different classes (issue #14909). When a new tag is discovered, it
- // is assumed that the previous tag was closed at the last replayable entry.
- Entry entry;
- if (!object_player->empty()) {
- m_watch_prune_active_tag = false;
- object_player->front(&entry);
-
- if (!m_active_tag_tid) {
- ldout(m_cct, 10) << __func__ << ": "
- << "object_num=" << object_num << ", "
- << "initial tag=" << entry.get_tag_tid()
- << dendl;
- m_active_tag_tid = entry.get_tag_tid();
- return true;
- } else if (entry.get_tag_tid() < *m_active_tag_tid ||
- (m_prune_tag_tid && entry.get_tag_tid() <= *m_prune_tag_tid)) {
- // entry occurred before the current active tag
- ldout(m_cct, 10) << __func__ << ": detected stale entry: "
- << "object_num=" << object_num << ", "
- << "entry=" << entry << dendl;
- prune_tag(entry.get_tag_tid());
- continue;
- } else if (entry.get_tag_tid() > *m_active_tag_tid) {
- // new tag at current playback position -- implies that previous
- // tag ended abruptly without flushing out all records
- // search for the start record for the next tag
- ldout(m_cct, 10) << __func__ << ": new tag detected: "
- << "object_num=" << object_num << ", "
- << "active_tag=" << *m_active_tag_tid << ", "
- << "new_tag=" << entry.get_tag_tid() << dendl;
- if (entry.get_entry_tid() == 0) {
- // first entry in new tag -- can promote to active
- prune_active_tag(entry.get_tag_tid());
- return true;
- } else {
- // prune current active and wait for initial entry for new tag
- prune_active_tag(boost::none);
- continue;
- }
- } else {
- ldout(m_cct, 20) << __func__ << ": "
- << "object_num=" << object_num << ", "
- << "entry: " << entry << dendl;
- assert(entry.get_tag_tid() == *m_active_tag_tid);
- return true;
- }
- } else {
- if (!m_active_tag_tid) {
- // waiting for our first entry
- ldout(m_cct, 10) << __func__ << ": waiting for first entry: "
- << "object_num=" << object_num << dendl;
- return false;
- } else if (m_prune_tag_tid && *m_prune_tag_tid == *m_active_tag_tid) {
- ldout(m_cct, 10) << __func__ << ": no more entries" << dendl;
- return false;
- } else if (m_watch_enabled && m_watch_prune_active_tag) {
- // detected current tag is now longer active and we have re-read the
- // current object but it's still empty, so this tag is done
- ldout(m_cct, 10) << __func__ << ": assuming no more in-sequence entries: "
- << "object_num=" << object_num << ", "
- << "active_tag " << *m_active_tag_tid << dendl;
- prune_active_tag(boost::none);
- continue;
- } else if (object_player->refetch_required()) {
- // if the active object requires a refetch, don't proceed looking for a
- // new tag before this process completes
- ldout(m_cct, 10) << __func__ << ": refetch required: "
- << "object_num=" << object_num << dendl;
- return false;
- } else if (!m_watch_enabled) {
- // current playback position is empty so this tag is done
- ldout(m_cct, 10) << __func__ << ": no more in-sequence entries: "
- << "object_num=" << object_num << ", "
- << "active_tag=" << *m_active_tag_tid << dendl;
- prune_active_tag(boost::none);
- continue;
- } else if (!m_watch_scheduled) {
- // no more entries and we don't have an active watch in-progress
- ldout(m_cct, 10) << __func__ << ": no more entries -- watch required"
- << dendl;
- return false;
- }
- }
- }
- return false;
-}
-
-void JournalPlayer::prune_tag(uint64_t tag_tid) {
- assert(m_lock.is_locked());
- ldout(m_cct, 10) << __func__ << ": pruning remaining entries for tag "
- << tag_tid << dendl;
-
- // prune records that are at or below the largest prune tag tid
- if (!m_prune_tag_tid || *m_prune_tag_tid < tag_tid) {
- m_prune_tag_tid = tag_tid;
- }
-
- bool pruned = false;
- for (auto &player_pair : m_object_players) {
- ObjectPlayerPtr object_player(player_pair.second);
- ldout(m_cct, 15) << __func__ << ": checking " << object_player->get_oid()
- << dendl;
- while (!object_player->empty()) {
- Entry entry;
- object_player->front(&entry);
- if (entry.get_tag_tid() == tag_tid) {
- ldout(m_cct, 20) << __func__ << ": pruned " << entry << dendl;
- object_player->pop_front();
- pruned = true;
- } else {
- break;
- }
- }
- }
-
- // avoid watch delay when pruning stale tags from journal objects
- if (pruned) {
- ldout(m_cct, 15) << __func__ << ": reseting refetch state to immediate"
- << dendl;
- for (auto &player_pair : m_object_players) {
- ObjectPlayerPtr object_player(player_pair.second);
- object_player->set_refetch_state(ObjectPlayer::REFETCH_STATE_IMMEDIATE);
- }
- }
-
- // trim empty player to prefetch the next available object
- for (auto &player_pair : m_object_players) {
- remove_empty_object_player(player_pair.second);
- }
-}
-
-void JournalPlayer::prune_active_tag(const boost::optional<uint64_t>& tag_tid) {
- assert(m_lock.is_locked());
- assert(m_active_tag_tid);
-
- uint64_t active_tag_tid = *m_active_tag_tid;
- if (tag_tid) {
- m_active_tag_tid = tag_tid;
- }
- m_splay_offset = 0;
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
-
- prune_tag(active_tag_tid);
-}
-
-ObjectPlayerPtr JournalPlayer::get_object_player() const {
- assert(m_lock.is_locked());
-
- SplayedObjectPlayers::const_iterator it = m_object_players.find(
- m_splay_offset);
- assert(it != m_object_players.end());
- return it->second;
-}
-
-ObjectPlayerPtr JournalPlayer::get_object_player(uint64_t object_number) const {
- assert(m_lock.is_locked());
-
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- uint8_t splay_offset = object_number % splay_width;
- auto splay_it = m_object_players.find(splay_offset);
- assert(splay_it != m_object_players.end());
-
- ObjectPlayerPtr object_player = splay_it->second;
- assert(object_player->get_object_number() == object_number);
- return object_player;
-}
-
-void JournalPlayer::advance_splay_object() {
- assert(m_lock.is_locked());
- ++m_splay_offset;
- m_splay_offset %= m_journal_metadata->get_splay_width();
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
- ldout(m_cct, 20) << __func__ << ": new offset "
- << static_cast<uint32_t>(m_splay_offset) << dendl;
-}
-
-bool JournalPlayer::remove_empty_object_player(const ObjectPlayerPtr &player) {
- assert(m_lock.is_locked());
- assert(!m_watch_scheduled);
-
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- uint64_t object_set = player->get_object_number() / splay_width;
- uint64_t active_set = m_journal_metadata->get_active_set();
- if (!player->empty() || object_set == active_set) {
- return false;
- } else if (player->refetch_required()) {
- ldout(m_cct, 20) << __func__ << ": " << player->get_oid() << " requires "
- << "a refetch" << dendl;
- return false;
- } else if (m_active_set != active_set) {
- ldout(m_cct, 20) << __func__ << ": new active set detected, all players "
- << "require refetch" << dendl;
- m_active_set = active_set;
- for (auto &pair : m_object_players) {
- pair.second->set_refetch_state(ObjectPlayer::REFETCH_STATE_IMMEDIATE);
- }
- return false;
- }
-
- ldout(m_cct, 15) << __func__ << ": " << player->get_oid() << " empty"
- << dendl;
-
- m_watch_prune_active_tag = false;
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
-
- uint64_t next_object_num = player->get_object_number() + splay_width;
- fetch(next_object_num);
- return true;
-}
-
-void JournalPlayer::fetch(uint64_t object_num) {
- assert(m_lock.is_locked());
-
- ObjectPlayerPtr object_player(new ObjectPlayer(
- m_ioctx, m_object_oid_prefix, object_num, m_journal_metadata->get_timer(),
- m_journal_metadata->get_timer_lock(), m_journal_metadata->get_order(),
- m_journal_metadata->get_settings().max_fetch_bytes));
-
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- m_object_players[object_num % splay_width] = object_player;
- fetch(object_player);
-}
-
-void JournalPlayer::fetch(const ObjectPlayerPtr &object_player) {
- assert(m_lock.is_locked());
-
- uint64_t object_num = object_player->get_object_number();
- std::string oid = utils::get_object_name(m_object_oid_prefix, object_num);
- assert(m_fetch_object_numbers.count(object_num) == 0);
- m_fetch_object_numbers.insert(object_num);
-
- ldout(m_cct, 10) << __func__ << ": " << oid << dendl;
- C_Fetch *fetch_ctx = new C_Fetch(this, object_num);
-
- object_player->fetch(fetch_ctx);
-}
-
-void JournalPlayer::handle_fetched(uint64_t object_num, int r) {
- ldout(m_cct, 10) << __func__ << ": "
- << utils::get_object_name(m_object_oid_prefix, object_num)
- << ": r=" << r << dendl;
-
- Mutex::Locker locker(m_lock);
- assert(m_fetch_object_numbers.count(object_num) == 1);
- m_fetch_object_numbers.erase(object_num);
-
- if (m_shut_down) {
- return;
- }
-
- if (r == 0) {
- ObjectPlayerPtr object_player = get_object_player(object_num);
- remove_empty_object_player(object_player);
- }
- process_state(object_num, r);
-}
-
-void JournalPlayer::refetch(bool immediate) {
- ldout(m_cct, 10) << __func__ << dendl;
- assert(m_lock.is_locked());
- m_handler_notified = false;
-
- // if watching the object, handle the periodic re-fetch
- if (m_watch_enabled) {
- schedule_watch(immediate);
- return;
- }
-
- ObjectPlayerPtr object_player = get_object_player();
- if (object_player->refetch_required()) {
- object_player->set_refetch_state(ObjectPlayer::REFETCH_STATE_NONE);
- fetch(object_player);
- return;
- }
-
- notify_complete(0);
-}
-
-void JournalPlayer::schedule_watch(bool immediate) {
- ldout(m_cct, 10) << __func__ << dendl;
- assert(m_lock.is_locked());
- if (m_watch_scheduled) {
- return;
- }
-
- m_watch_scheduled = true;
-
- if (m_watch_step == WATCH_STEP_ASSERT_ACTIVE) {
- // detect if a new tag has been created in case we are blocked
- // by an incomplete tag sequence
- ldout(m_cct, 20) << __func__ << ": asserting active tag="
- << *m_active_tag_tid << dendl;
-
- m_async_op_tracker.start_op();
- FunctionContext *ctx = new FunctionContext([this](int r) {
- handle_watch_assert_active(r);
- });
- m_journal_metadata->assert_active_tag(*m_active_tag_tid, ctx);
- return;
- }
-
- ObjectPlayerPtr object_player;
- double watch_interval = m_watch_interval;
-
- switch (m_watch_step) {
- case WATCH_STEP_FETCH_CURRENT:
- {
- object_player = get_object_player();
-
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- uint64_t active_set = m_journal_metadata->get_active_set();
- uint64_t object_set = object_player->get_object_number() / splay_width;
- if (immediate ||
- (object_player->get_refetch_state() ==
- ObjectPlayer::REFETCH_STATE_IMMEDIATE) ||
- (object_set < active_set && object_player->refetch_required())) {
- ldout(m_cct, 20) << __func__ << ": immediately refetching "
- << object_player->get_oid()
- << dendl;
- object_player->set_refetch_state(ObjectPlayer::REFETCH_STATE_NONE);
- watch_interval = 0;
- }
- }
- break;
- case WATCH_STEP_FETCH_FIRST:
- object_player = m_object_players.begin()->second;
- watch_interval = 0;
- break;
- default:
- assert(false);
- }
-
- ldout(m_cct, 20) << __func__ << ": scheduling watch on "
- << object_player->get_oid() << dendl;
- Context *ctx = utils::create_async_context_callback(
- m_journal_metadata, new C_Watch(this, object_player->get_object_number()));
- object_player->watch(ctx, watch_interval);
-}
-
-void JournalPlayer::handle_watch(uint64_t object_num, int r) {
- ldout(m_cct, 10) << __func__ << ": r=" << r << dendl;
- Mutex::Locker locker(m_lock);
- assert(m_watch_scheduled);
- m_watch_scheduled = false;
-
- if (m_shut_down || r == -ECANCELED) {
- // unwatch of object player(s)
- return;
- }
-
- ObjectPlayerPtr object_player = get_object_player(object_num);
- if (r == 0 && object_player->empty()) {
- // possibly need to prune this empty object player if we've
- // already fetched it after the active set was advanced with no
- // new records
- remove_empty_object_player(object_player);
- }
-
- // determine what object to query on next watch schedule tick
- uint8_t splay_width = m_journal_metadata->get_splay_width();
- if (m_watch_step == WATCH_STEP_FETCH_CURRENT &&
- object_player->get_object_number() % splay_width != 0) {
- m_watch_step = WATCH_STEP_FETCH_FIRST;
- } else if (m_active_tag_tid) {
- m_watch_step = WATCH_STEP_ASSERT_ACTIVE;
- } else {
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
- }
-
- process_state(object_num, r);
-}
-
-void JournalPlayer::handle_watch_assert_active(int r) {
- ldout(m_cct, 10) << __func__ << ": r=" << r << dendl;
-
- Mutex::Locker locker(m_lock);
- assert(m_watch_scheduled);
- m_watch_scheduled = false;
-
- if (r == -ESTALE) {
- // newer tag exists -- since we are at this step in the watch sequence,
- // we know we can prune the active tag if watch fails again
- ldout(m_cct, 10) << __func__ << ": tag " << *m_active_tag_tid << " "
- << "no longer active" << dendl;
- m_watch_prune_active_tag = true;
- }
-
- m_watch_step = WATCH_STEP_FETCH_CURRENT;
- if (!m_shut_down && m_watch_enabled) {
- schedule_watch(false);
- }
- m_async_op_tracker.finish_op();
-}
-
-void JournalPlayer::notify_entries_available() {
- assert(m_lock.is_locked());
- if (m_handler_notified) {
- return;
- }
- m_handler_notified = true;
-
- ldout(m_cct, 10) << __func__ << ": entries available" << dendl;
- m_journal_metadata->queue(new C_HandleEntriesAvailable(
- m_replay_handler), 0);
-}
-
-void JournalPlayer::notify_complete(int r) {
- assert(m_lock.is_locked());
- m_handler_notified = true;
-
- ldout(m_cct, 10) << __func__ << ": replay complete: r=" << r << dendl;
- m_journal_metadata->queue(new C_HandleComplete(
- m_replay_handler), r);
-}
-
-} // namespace journal
Code Review / stor4nfv.git / blobdiff