1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
8 * This is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License version 2.1, as published by the Free Software
11 * Foundation. See file COPYING.
19 #include "MDSContext.h"
21 #include "osdc/Journaler.h"
22 #include "mds/JournalPointer.h"
24 #include "common/entity_name.h"
25 #include "common/perf_counters.h"
26 #include "common/Cond.h"
28 #include "events/ESubtreeMap.h"
30 #include "common/config.h"
31 #include "common/errno.h"
32 #include "include/ceph_assert.h"
34 #define dout_context g_ceph_context
35 #define dout_subsys ceph_subsys_mds
37 #define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".log "
42 if (journaler
) { delete journaler
; journaler
= 0; }
44 g_ceph_context
->get_perfcounters_collection()->remove(logger
);
51 void MDLog::create_logger()
53 PerfCountersBuilder
plb(g_ceph_context
, "mds_log", l_mdl_first
, l_mdl_last
);
55 plb
.add_u64_counter(l_mdl_evadd
, "evadd", "Events submitted", "subm",
56 PerfCountersBuilder::PRIO_INTERESTING
);
57 plb
.add_u64(l_mdl_ev
, "ev", "Events", "evts",
58 PerfCountersBuilder::PRIO_INTERESTING
);
59 plb
.add_u64(l_mdl_seg
, "seg", "Segments", "segs",
60 PerfCountersBuilder::PRIO_INTERESTING
);
62 plb
.set_prio_default(PerfCountersBuilder::PRIO_USEFUL
);
63 plb
.add_u64(l_mdl_evexg
, "evexg", "Expiring events");
64 plb
.add_u64(l_mdl_evexd
, "evexd", "Current expired events");
65 plb
.add_u64(l_mdl_segexg
, "segexg", "Expiring segments");
66 plb
.add_u64(l_mdl_segexd
, "segexd", "Current expired segments");
67 plb
.add_u64_counter(l_mdl_replayed
, "replayed", "Events replayed",
68 "repl", PerfCountersBuilder::PRIO_INTERESTING
);
69 plb
.add_time_avg(l_mdl_jlat
, "jlat", "Journaler flush latency");
70 plb
.add_u64_counter(l_mdl_evex
, "evex", "Total expired events");
71 plb
.add_u64_counter(l_mdl_evtrm
, "evtrm", "Trimmed events");
72 plb
.add_u64_counter(l_mdl_segadd
, "segadd", "Segments added");
73 plb
.add_u64_counter(l_mdl_segex
, "segex", "Total expired segments");
74 plb
.add_u64_counter(l_mdl_segtrm
, "segtrm", "Trimmed segments");
76 plb
.set_prio_default(PerfCountersBuilder::PRIO_DEBUGONLY
);
77 plb
.add_u64(l_mdl_expos
, "expos", "Journaler xpire position");
78 plb
.add_u64(l_mdl_wrpos
, "wrpos", "Journaler write position");
79 plb
.add_u64(l_mdl_rdpos
, "rdpos", "Journaler read position");
82 logger
= plb
.create_perf_counters();
83 g_ceph_context
->get_perfcounters_collection()->add(logger
);
86 void MDLog::set_write_iohint(unsigned iohint_flags
)
88 journaler
->set_write_iohint(iohint_flags
);
91 class C_MDL_WriteError
: public MDSIOContextBase
{
94 MDSRank
*get_mds() override
{return mdlog
->mds
;}
96 void finish(int r
) override
{
97 MDSRank
*mds
= get_mds();
98 // assume journal is reliable, so don't choose action based on
99 // g_conf()->mds_action_on_write_error.
100 if (r
== -CEPHFS_EBLOCKLISTED
) {
101 derr
<< "we have been blocklisted (fenced), respawning..." << dendl
;
104 derr
<< "unhandled error " << cpp_strerror(r
) << ", shutting down..." << dendl
;
105 // Although it's possible that this could be something transient,
106 // it's severe and scary, so disable this rank until an administrator
108 mds
->clog
->error() << "Unhandled journal write error on MDS rank " <<
109 mds
->get_nodeid() << ": " << cpp_strerror(r
) << ", shutting down.";
111 ceph_abort(); // damaged should never return
116 explicit C_MDL_WriteError(MDLog
*m
) :
117 MDSIOContextBase(false), mdlog(m
) {}
118 void print(ostream
& out
) const override
{
119 out
<< "mdlog_write_error";
124 void MDLog::write_head(MDSContext
*c
)
128 fin
= new C_IO_Wrapper(mds
, c
);
130 journaler
->write_head(fin
);
133 uint64_t MDLog::get_read_pos() const
135 return journaler
->get_read_pos();
138 uint64_t MDLog::get_write_pos() const
140 return journaler
->get_write_pos();
143 uint64_t MDLog::get_safe_pos() const
145 return journaler
->get_write_safe_pos();
150 void MDLog::create(MDSContext
*c
)
152 dout(5) << "create empty log" << dendl
;
154 C_GatherBuilder
gather(g_ceph_context
);
155 // This requires an OnFinisher wrapper because Journaler will call back the completion for write_head inside its own lock
156 // XXX but should maybe that be handled inside Journaler?
157 gather
.set_finisher(new C_IO_Wrapper(mds
, c
));
159 // The inode of the default Journaler we will create
160 ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
162 // Instantiate Journaler and start async write to RADOS
163 ceph_assert(journaler
== NULL
);
164 journaler
= new Journaler("mdlog", ino
, mds
->get_metadata_pool(),
165 CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
,
166 l_mdl_jlat
, mds
->finisher
);
167 ceph_assert(journaler
->is_readonly());
168 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
169 journaler
->set_writeable();
170 journaler
->create(&mds
->mdcache
->default_log_layout
, g_conf()->mds_journal_format
);
171 journaler
->write_head(gather
.new_sub());
173 // Async write JournalPointer to RADOS
174 JournalPointer
jp(mds
->get_nodeid(), mds
->get_metadata_pool());
177 jp
.save(mds
->objecter
, gather
.new_sub());
181 logger
->set(l_mdl_expos
, journaler
->get_expire_pos());
182 logger
->set(l_mdl_wrpos
, journaler
->get_write_pos());
184 submit_thread
.create("md_submit");
187 void MDLog::open(MDSContext
*c
)
189 dout(5) << "open discovering log bounds" << dendl
;
191 ceph_assert(!recovery_thread
.is_started());
192 recovery_thread
.set_completion(c
);
193 recovery_thread
.create("md_recov_open");
195 submit_thread
.create("md_submit");
196 // either append() or replay() will follow.
200 * Final part of reopen() procedure, after recovery_thread
201 * has done its thing we call append()
203 class C_ReopenComplete
: public MDSInternalContext
{
205 MDSContext
*on_complete
;
207 C_ReopenComplete(MDLog
*mdlog_
, MDSContext
*on_complete_
) : MDSInternalContext(mdlog_
->mds
), mdlog(mdlog_
), on_complete(on_complete_
) {}
208 void finish(int r
) override
{
210 on_complete
->complete(r
);
215 * Given that open() has been called in the past, go through the journal
216 * recovery procedure again, potentially reformatting the journal if it
217 * was in an old format.
219 void MDLog::reopen(MDSContext
*c
)
221 dout(5) << "reopen" << dendl
;
223 // Because we will call append() at the completion of this, check that we have already
224 // read the whole journal.
225 ceph_assert(journaler
!= NULL
);
226 ceph_assert(journaler
->get_read_pos() == journaler
->get_write_pos());
231 // recovery_thread was started at some point in the past. Although
232 // it has called it's completion if we made it back here, it might
233 // still not have been cleaned up: join it.
234 recovery_thread
.join();
236 recovery_thread
.set_completion(new C_ReopenComplete(this, c
));
237 recovery_thread
.create("md_recov_reopen");
242 dout(5) << "append positioning at end and marking writeable" << dendl
;
243 journaler
->set_read_pos(journaler
->get_write_pos());
244 journaler
->set_expire_pos(journaler
->get_write_pos());
246 journaler
->set_writeable();
248 logger
->set(l_mdl_expos
, journaler
->get_write_pos());
253 // -------------------------------------------------
255 void MDLog::_start_entry(LogEvent
*e
)
257 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
259 ceph_assert(cur_event
== NULL
);
264 EMetaBlob
*metablob
= e
->get_metablob();
266 metablob
->event_seq
= event_seq
;
267 metablob
->last_subtree_map
= get_last_segment_seq();
271 void MDLog::cancel_entry(LogEvent
*le
)
273 ceph_assert(le
== cur_event
);
278 void MDLog::_submit_entry(LogEvent
*le
, MDSLogContextBase
*c
)
280 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
281 ceph_assert(!mds
->is_any_replay());
282 ceph_assert(!capped
);
284 ceph_assert(le
== cur_event
);
287 // let the event register itself in the segment
288 ceph_assert(!segments
.empty());
289 LogSegment
*ls
= segments
.rbegin()->second
;
293 le
->update_segment();
294 le
->set_stamp(ceph_clock_now());
296 mdsmap_up_features
= mds
->mdsmap
->get_up_features();
297 pending_events
[ls
->seq
].push_back(PendingEvent(le
, c
));
301 logger
->inc(l_mdl_evadd
);
302 logger
->set(l_mdl_ev
, num_events
);
307 uint64_t period
= journaler
->get_layout_period();
308 // start a new segment?
309 if (le
->get_type() == EVENT_SUBTREEMAP
||
310 (le
->get_type() == EVENT_IMPORTFINISH
&& mds
->is_resolve())) {
311 // avoid infinite loop when ESubtreeMap is very large.
312 // do not insert ESubtreeMap among EImportFinish events that finish
313 // disambiguate imports. Because the ESubtreeMap reflects the subtree
314 // state when all EImportFinish events are replayed.
315 } else if (ls
->end
/period
!= ls
->offset
/period
||
316 ls
->num_events
>= g_conf()->mds_log_events_per_segment
) {
317 dout(10) << "submit_entry also starting new segment: last = "
318 << ls
->seq
<< "/" << ls
->offset
<< ", event seq = " << event_seq
<< dendl
;
319 _start_new_segment();
320 } else if (g_conf()->mds_debug_subtrees
&&
321 le
->get_type() != EVENT_SUBTREEMAP_TEST
) {
322 // debug: journal this every time to catch subtree replay bugs.
323 // use a different event id so it doesn't get interpreted as a
324 // LogSegment boundary on replay.
325 LogEvent
*sle
= mds
->mdcache
->create_subtree_map();
326 sle
->set_type(EVENT_SUBTREEMAP_TEST
);
327 _submit_entry(sle
, NULL
);
332 * Invoked on the flush after each entry submitted
334 class C_MDL_Flushed
: public MDSLogContextBase
{
337 MDSRank
*get_mds() override
{return mdlog
->mds
;}
340 void finish(int r
) override
{
342 wrapped
->complete(r
);
346 C_MDL_Flushed(MDLog
*m
, MDSContext
*w
)
347 : mdlog(m
), wrapped(w
) {}
348 C_MDL_Flushed(MDLog
*m
, uint64_t wp
) : mdlog(m
), wrapped(NULL
) {
353 void MDLog::_submit_thread()
355 dout(10) << "_submit_thread start" << dendl
;
357 std::unique_lock locker
{submit_mutex
};
359 while (!mds
->is_daemon_stopping()) {
360 if (g_conf()->mds_log_pause
) {
361 submit_cond
.wait(locker
);
365 map
<uint64_t,list
<PendingEvent
> >::iterator it
= pending_events
.begin();
366 if (it
== pending_events
.end()) {
367 submit_cond
.wait(locker
);
371 if (it
->second
.empty()) {
372 pending_events
.erase(it
);
376 int64_t features
= mdsmap_up_features
;
377 PendingEvent data
= it
->second
.front();
378 it
->second
.pop_front();
383 LogEvent
*le
= data
.le
;
384 LogSegment
*ls
= le
->_segment
;
385 // encode it, with event type
387 le
->encode_with_header(bl
, features
);
389 uint64_t write_pos
= journaler
->get_write_pos();
391 le
->set_start_off(write_pos
);
392 if (le
->get_type() == EVENT_SUBTREEMAP
)
393 ls
->offset
= write_pos
;
395 dout(5) << "_submit_thread " << write_pos
<< "~" << bl
.length()
396 << " : " << *le
<< dendl
;
399 const uint64_t new_write_pos
= journaler
->append_entry(bl
); // bl is destroyed.
400 ls
->end
= new_write_pos
;
402 MDSLogContextBase
*fin
;
404 fin
= dynamic_cast<MDSLogContextBase
*>(data
.fin
);
406 fin
->set_write_pos(new_write_pos
);
408 fin
= new C_MDL_Flushed(this, new_write_pos
);
411 journaler
->wait_for_flush(fin
);
417 logger
->set(l_mdl_wrpos
, ls
->end
);
423 dynamic_cast<MDSContext
*>(data
.fin
);
425 C_MDL_Flushed
*fin2
= new C_MDL_Flushed(this, fin
);
426 fin2
->set_write_pos(journaler
->get_write_pos());
427 journaler
->wait_for_flush(fin2
);
441 void MDLog::wait_for_safe(MDSContext
*c
)
445 bool no_pending
= true;
446 if (!pending_events
.empty()) {
447 pending_events
.rbegin()->second
.push_back(PendingEvent(NULL
, c
));
449 submit_cond
.notify_all();
452 submit_mutex
.unlock();
455 journaler
->wait_for_flush(new C_IO_Wrapper(mds
, c
));
462 bool do_flush
= unflushed
> 0;
464 if (!pending_events
.empty()) {
465 pending_events
.rbegin()->second
.push_back(PendingEvent(NULL
, NULL
, true));
467 submit_cond
.notify_all();
470 submit_mutex
.unlock();
476 void MDLog::kick_submitter()
478 std::lock_guard
l(submit_mutex
);
479 submit_cond
.notify_all();
484 dout(5) << "cap" << dendl
;
488 void MDLog::shutdown()
490 ceph_assert(ceph_mutex_is_locked_by_me(mds
->mds_lock
));
492 dout(5) << "shutdown" << dendl
;
493 if (submit_thread
.is_started()) {
494 ceph_assert(mds
->is_daemon_stopping());
496 if (submit_thread
.am_self()) {
497 // Called suicide from the thread: trust it to do no work after
498 // returning from suicide, and subsequently respect mds->is_daemon_stopping()
499 // and fall out of its loop.
501 mds
->mds_lock
.unlock();
502 // Because MDS::stopping is true, it's safe to drop mds_lock: nobody else
503 // picking it up will do anything with it.
506 submit_cond
.notify_all();
507 submit_mutex
.unlock();
509 mds
->mds_lock
.lock();
511 submit_thread
.join();
515 // Replay thread can be stuck inside e.g. Journaler::wait_for_readable,
516 // so we need to shutdown the journaler first.
518 journaler
->shutdown();
521 if (replay_thread
.is_started() && !replay_thread
.am_self()) {
522 mds
->mds_lock
.unlock();
523 replay_thread
.join();
524 mds
->mds_lock
.lock();
527 if (recovery_thread
.is_started() && !recovery_thread
.am_self()) {
528 mds
->mds_lock
.unlock();
529 recovery_thread
.join();
530 mds
->mds_lock
.lock();
535 // -----------------------------
538 void MDLog::_start_new_segment()
540 _prepare_new_segment();
541 _journal_segment_subtree_map(NULL
);
544 void MDLog::_prepare_new_segment()
546 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
548 uint64_t seq
= event_seq
+ 1;
549 dout(7) << __func__
<< " seq " << seq
<< dendl
;
551 segments
[seq
] = new LogSegment(seq
);
553 logger
->inc(l_mdl_segadd
);
554 logger
->set(l_mdl_seg
, segments
.size());
556 // Adjust to next stray dir
557 mds
->mdcache
->advance_stray();
560 void MDLog::_journal_segment_subtree_map(MDSContext
*onsync
)
562 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
564 dout(7) << __func__
<< dendl
;
565 ESubtreeMap
*sle
= mds
->mdcache
->create_subtree_map();
566 sle
->event_seq
= get_last_segment_seq();
568 _submit_entry(sle
, new C_MDL_Flushed(this, onsync
));
571 class C_OFT_Committed
: public MDSInternalContext
{
575 C_OFT_Committed(MDLog
*l
, uint64_t s
) :
576 MDSInternalContext(l
->mds
), mdlog(l
), seq(s
) {}
577 void finish(int ret
) override
{
578 mdlog
->trim_expired_segments();
582 void MDLog::trim(int m
)
584 unsigned max_segments
= g_conf()->mds_log_max_segments
;
585 int max_events
= g_conf()->mds_log_max_events
;
589 if (mds
->mdcache
->is_readonly()) {
590 dout(10) << "trim, ignoring read-only FS" << dendl
;
594 // Clamp max_events to not be smaller than events per segment
595 if (max_events
> 0 && max_events
<= g_conf()->mds_log_events_per_segment
) {
596 max_events
= g_conf()->mds_log_events_per_segment
+ 1;
603 << segments
.size() << " / " << max_segments
<< " segments, "
604 << num_events
<< " / " << max_events
<< " events"
605 << ", " << expiring_segments
.size() << " (" << expiring_events
<< ") expiring"
606 << ", " << expired_segments
.size() << " (" << expired_events
<< ") expired"
609 if (segments
.empty()) {
610 submit_mutex
.unlock();
614 // hack: only trim for a few seconds at a time
615 utime_t stop
= ceph_clock_now();
618 int op_prio
= CEPH_MSG_PRIO_LOW
+
619 (CEPH_MSG_PRIO_HIGH
- CEPH_MSG_PRIO_LOW
) *
620 expiring_segments
.size() / max_segments
;
621 if (op_prio
> CEPH_MSG_PRIO_HIGH
)
622 op_prio
= CEPH_MSG_PRIO_HIGH
;
624 unsigned new_expiring_segments
= 0;
626 unsigned max_expiring_segments
= 0;
627 if (pre_segments_size
> 0){
628 max_expiring_segments
= max_segments
/2;
629 assert(segments
.size() >= pre_segments_size
);
630 max_expiring_segments
= std::max
<unsigned>(max_expiring_segments
,segments
.size() - pre_segments_size
);
633 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
634 while (p
!= segments
.end()) {
635 if (stop
< ceph_clock_now())
638 unsigned num_remaining_segments
= (segments
.size() - expired_segments
.size() - expiring_segments
.size());
639 if ((num_remaining_segments
<= max_segments
) &&
640 (max_events
< 0 || num_events
- expiring_events
- expired_events
<= max_events
))
643 // Do not trim too many segments at once for peak workload. If mds keeps creating N segments each tick,
644 // the upper bound of 'num_remaining_segments - max_segments' is '2 * N'
645 if (new_expiring_segments
* 2 > num_remaining_segments
)
648 if (max_expiring_segments
> 0 &&
649 expiring_segments
.size() >= max_expiring_segments
)
652 // look at first segment
653 LogSegment
*ls
= p
->second
;
657 if (pending_events
.count(ls
->seq
) ||
658 ls
->end
> safe_pos
) {
659 dout(5) << "trim segment " << ls
->seq
<< "/" << ls
->offset
<< ", not fully flushed yet, safe "
660 << journaler
->get_write_safe_pos() << " < end " << ls
->end
<< dendl
;
664 if (expiring_segments
.count(ls
)) {
665 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
666 << ", " << ls
->num_events
<< " events" << dendl
;
667 } else if (expired_segments
.count(ls
)) {
668 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
669 << ", " << ls
->num_events
<< " events" << dendl
;
671 ceph_assert(expiring_segments
.count(ls
) == 0);
672 new_expiring_segments
++;
673 expiring_segments
.insert(ls
);
674 expiring_events
+= ls
->num_events
;
675 submit_mutex
.unlock();
677 uint64_t last_seq
= ls
->seq
;
678 try_expire(ls
, op_prio
);
681 p
= segments
.lower_bound(last_seq
+ 1);
686 !mds
->mdcache
->open_file_table
.is_any_committing()) {
687 uint64_t last_seq
= get_last_segment_seq();
688 if (mds
->mdcache
->open_file_table
.is_any_dirty() ||
689 last_seq
> mds
->mdcache
->open_file_table
.get_committed_log_seq()) {
690 submit_mutex
.unlock();
691 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
692 last_seq
, CEPH_MSG_PRIO_HIGH
);
697 // discard expired segments and unlock submit_mutex
698 _trim_expired_segments();
701 class C_MaybeExpiredSegment
: public MDSInternalContext
{
706 C_MaybeExpiredSegment(MDLog
*mdl
, LogSegment
*s
, int p
) :
707 MDSInternalContext(mdl
->mds
), mdlog(mdl
), ls(s
), op_prio(p
) {}
708 void finish(int res
) override
{
710 mdlog
->mds
->handle_write_error(res
);
711 mdlog
->_maybe_expired(ls
, op_prio
);
716 * Like MDLog::trim, but instead of trimming to max_segments, trim all but the latest
719 int MDLog::trim_all()
723 dout(10) << __func__
<< ": "
725 << "/" << expiring_segments
.size()
726 << "/" << expired_segments
.size() << dendl
;
728 uint64_t last_seq
= 0;
729 if (!segments
.empty()) {
730 last_seq
= get_last_segment_seq();
732 !mds
->mdcache
->open_file_table
.is_any_committing() &&
733 last_seq
> mds
->mdcache
->open_file_table
.get_committing_log_seq()) {
734 submit_mutex
.unlock();
735 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
736 last_seq
, CEPH_MSG_PRIO_DEFAULT
);
741 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
742 while (p
!= segments
.end() &&
743 p
->first
< last_seq
&&
744 p
->second
->end
< safe_pos
) { // next segment should have been started
745 LogSegment
*ls
= p
->second
;
748 // Caller should have flushed journaler before calling this
749 if (pending_events
.count(ls
->seq
)) {
750 dout(5) << __func__
<< ": segment " << ls
->seq
<< " has pending events" << dendl
;
751 submit_mutex
.unlock();
752 return -CEPHFS_EAGAIN
;
755 if (expiring_segments
.count(ls
)) {
756 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
757 << ", " << ls
->num_events
<< " events" << dendl
;
758 } else if (expired_segments
.count(ls
)) {
759 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
760 << ", " << ls
->num_events
<< " events" << dendl
;
762 ceph_assert(expiring_segments
.count(ls
) == 0);
763 expiring_segments
.insert(ls
);
764 expiring_events
+= ls
->num_events
;
765 submit_mutex
.unlock();
767 uint64_t next_seq
= ls
->seq
+ 1;
768 try_expire(ls
, CEPH_MSG_PRIO_DEFAULT
);
771 p
= segments
.lower_bound(next_seq
);
775 _trim_expired_segments();
781 void MDLog::try_expire(LogSegment
*ls
, int op_prio
)
783 MDSGatherBuilder
gather_bld(g_ceph_context
);
784 ls
->try_to_expire(mds
, gather_bld
, op_prio
);
786 if (gather_bld
.has_subs()) {
787 dout(5) << "try_expire expiring segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
788 gather_bld
.set_finisher(new C_MaybeExpiredSegment(this, ls
, op_prio
));
789 gather_bld
.activate();
791 dout(10) << "try_expire expired segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
793 ceph_assert(expiring_segments
.count(ls
));
794 expiring_segments
.erase(ls
);
795 expiring_events
-= ls
->num_events
;
797 submit_mutex
.unlock();
800 logger
->set(l_mdl_segexg
, expiring_segments
.size());
801 logger
->set(l_mdl_evexg
, expiring_events
);
804 void MDLog::_maybe_expired(LogSegment
*ls
, int op_prio
)
806 if (mds
->mdcache
->is_readonly()) {
807 dout(10) << "_maybe_expired, ignoring read-only FS" << dendl
;
811 dout(10) << "_maybe_expired segment " << ls
->seq
<< "/" << ls
->offset
812 << ", " << ls
->num_events
<< " events" << dendl
;
813 try_expire(ls
, op_prio
);
816 void MDLog::_trim_expired_segments()
818 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
820 uint64_t oft_committed_seq
= mds
->mdcache
->open_file_table
.get_committed_log_seq();
822 // trim expired segments?
823 bool trimmed
= false;
824 while (!segments
.empty()) {
825 LogSegment
*ls
= segments
.begin()->second
;
826 if (!expired_segments
.count(ls
)) {
827 dout(10) << "_trim_expired_segments waiting for " << ls
->seq
<< "/" << ls
->offset
828 << " to expire" << dendl
;
832 if (!capped
&& ls
->seq
>= oft_committed_seq
) {
833 dout(10) << "_trim_expired_segments open file table committedseq " << oft_committed_seq
834 << " <= " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
838 dout(10) << "_trim_expired_segments trimming expired "
839 << ls
->seq
<< "/0x" << std::hex
<< ls
->offset
<< std::dec
<< dendl
;
840 expired_events
-= ls
->num_events
;
841 expired_segments
.erase(ls
);
842 if (pre_segments_size
> 0)
844 num_events
-= ls
->num_events
;
846 // this was the oldest segment, adjust expire pos
847 if (journaler
->get_expire_pos() < ls
->end
) {
848 journaler
->set_expire_pos(ls
->end
);
849 logger
->set(l_mdl_expos
, ls
->end
);
851 logger
->set(l_mdl_expos
, ls
->offset
);
854 logger
->inc(l_mdl_segtrm
);
855 logger
->inc(l_mdl_evtrm
, ls
->num_events
);
857 segments
.erase(ls
->seq
);
862 submit_mutex
.unlock();
865 journaler
->write_head(0);
868 void MDLog::trim_expired_segments()
871 _trim_expired_segments();
874 void MDLog::_expired(LogSegment
*ls
)
876 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
878 dout(5) << "_expired segment " << ls
->seq
<< "/" << ls
->offset
879 << ", " << ls
->num_events
<< " events" << dendl
;
881 if (!capped
&& ls
== peek_current_segment()) {
882 dout(5) << "_expired not expiring " << ls
->seq
<< "/" << ls
->offset
883 << ", last one and !capped" << dendl
;
886 expired_segments
.insert(ls
);
887 expired_events
+= ls
->num_events
;
889 // Trigger all waiters
890 finish_contexts(g_ceph_context
, ls
->expiry_waiters
);
892 logger
->inc(l_mdl_evex
, ls
->num_events
);
893 logger
->inc(l_mdl_segex
);
896 logger
->set(l_mdl_ev
, num_events
);
897 logger
->set(l_mdl_evexd
, expired_events
);
898 logger
->set(l_mdl_seg
, segments
.size());
899 logger
->set(l_mdl_segexd
, expired_segments
.size());
904 void MDLog::replay(MDSContext
*c
)
906 ceph_assert(journaler
->is_active());
907 ceph_assert(journaler
->is_readonly());
910 if (journaler
->get_read_pos() == journaler
->get_write_pos()) {
911 dout(10) << "replay - journal empty, done." << dendl
;
912 mds
->mdcache
->trim();
913 if (mds
->is_standby_replay())
914 mds
->update_mlogger();
923 waitfor_replay
.push_back(c
);
926 dout(10) << "replay start, from " << journaler
->get_read_pos()
927 << " to " << journaler
->get_write_pos() << dendl
;
929 ceph_assert(num_events
== 0 || already_replayed
);
930 if (already_replayed
) {
931 // Ensure previous instance of ReplayThread is joined before
932 // we create another one
933 replay_thread
.join();
935 already_replayed
= true;
937 replay_thread
.create("md_log_replay");
942 * Resolve the JournalPointer object to a journal file, and
943 * instantiate a Journaler object. This may re-write the journal
944 * if the journal in RADOS appears to be in an old format.
946 * This is a separate thread because of the way it is initialized from inside
947 * the mds lock, which is also the global objecter lock -- rather than split
948 * it up into hard-to-read async operations linked up by contexts,
950 * When this function completes, the `journaler` attribute will be set to
951 * a Journaler instance using the latest available serialization format.
953 void MDLog::_recovery_thread(MDSContext
*completion
)
955 ceph_assert(journaler
== NULL
);
956 if (g_conf()->mds_journal_format
> JOURNAL_FORMAT_MAX
) {
957 dout(0) << "Configuration value for mds_journal_format is out of bounds, max is "
958 << JOURNAL_FORMAT_MAX
<< dendl
;
960 // Oh dear, something unreadable in the store for this rank: require
961 // operator intervention.
962 mds
->damaged_unlocked();
963 ceph_abort(); // damaged should not return
966 // First, read the pointer object.
967 // If the pointer object is not present, then create it with
968 // front = default ino and back = null
969 JournalPointer
jp(mds
->get_nodeid(), mds
->get_metadata_pool());
970 const int read_result
= jp
.load(mds
->objecter
);
971 if (read_result
== -CEPHFS_ENOENT
) {
972 inodeno_t
const default_log_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
973 jp
.front
= default_log_ino
;
974 int write_result
= jp
.save(mds
->objecter
);
975 // Nothing graceful we can do for this
976 ceph_assert(write_result
>= 0);
977 } else if (read_result
== -CEPHFS_EBLOCKLISTED
) {
978 derr
<< "Blocklisted during JournalPointer read! Respawning..." << dendl
;
980 ceph_abort(); // Should be unreachable because respawn calls execv
981 } else if (read_result
!= 0) {
982 mds
->clog
->error() << "failed to read JournalPointer: " << read_result
983 << " (" << cpp_strerror(read_result
) << ")";
984 mds
->damaged_unlocked();
985 ceph_abort(); // Should be unreachable because damaged() calls respawn()
988 // If the back pointer is non-null, that means that a journal
989 // rewrite failed part way through. Erase the back journal
992 if (mds
->is_standby_replay()) {
993 dout(1) << "Journal " << jp
.front
<< " is being rewritten, "
994 << "cannot replay in standby until an active MDS completes rewrite" << dendl
;
995 std::lock_guard
l(mds
->mds_lock
);
996 if (mds
->is_daemon_stopping()) {
999 completion
->complete(-CEPHFS_EAGAIN
);
1002 dout(1) << "Erasing journal " << jp
.back
<< dendl
;
1003 C_SaferCond erase_waiter
;
1004 Journaler
back("mdlog", jp
.back
, mds
->get_metadata_pool(),
1005 CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
,
1008 // Read all about this journal (header + extents)
1009 C_SaferCond recover_wait
;
1010 back
.recover(&recover_wait
);
1011 int recovery_result
= recover_wait
.wait();
1012 if (recovery_result
== -CEPHFS_EBLOCKLISTED
) {
1013 derr
<< "Blocklisted during journal recovery! Respawning..." << dendl
;
1015 ceph_abort(); // Should be unreachable because respawn calls execv
1016 } else if (recovery_result
!= 0) {
1017 // Journaler.recover succeeds if no journal objects are present: an error
1018 // means something worse like a corrupt header, which we can't handle here.
1019 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1020 << cpp_strerror(recovery_result
);
1021 mds
->damaged_unlocked();
1022 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1025 // We could read journal, so we can erase it.
1026 back
.erase(&erase_waiter
);
1027 int erase_result
= erase_waiter
.wait();
1029 // If we are successful, or find no data, we can update the JournalPointer to
1030 // reflect that the back journal is gone.
1031 if (erase_result
!= 0 && erase_result
!= -CEPHFS_ENOENT
) {
1032 derr
<< "Failed to erase journal " << jp
.back
<< ": " << cpp_strerror(erase_result
) << dendl
;
1034 dout(1) << "Successfully erased journal, updating journal pointer" << dendl
;
1036 int write_result
= jp
.save(mds
->objecter
);
1037 // Nothing graceful we can do for this
1038 ceph_assert(write_result
>= 0);
1042 /* Read the header from the front journal */
1043 Journaler
*front_journal
= new Journaler("mdlog", jp
.front
,
1044 mds
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
,
1045 logger
, l_mdl_jlat
, mds
->finisher
);
1047 // Assign to ::journaler so that we can be aborted by ::shutdown while
1048 // waiting for journaler recovery
1050 std::lock_guard
l(mds
->mds_lock
);
1051 journaler
= front_journal
;
1054 C_SaferCond recover_wait
;
1055 front_journal
->recover(&recover_wait
);
1056 dout(4) << "Waiting for journal " << jp
.front
<< " to recover..." << dendl
;
1057 int recovery_result
= recover_wait
.wait();
1058 dout(4) << "Journal " << jp
.front
<< " recovered." << dendl
;
1060 if (recovery_result
== -CEPHFS_EBLOCKLISTED
) {
1061 derr
<< "Blocklisted during journal recovery! Respawning..." << dendl
;
1063 ceph_abort(); // Should be unreachable because respawn calls execv
1064 } else if (recovery_result
!= 0) {
1065 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1066 << cpp_strerror(recovery_result
);
1067 mds
->damaged_unlocked();
1068 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1071 /* Check whether the front journal format is acceptable or needs re-write */
1072 if (front_journal
->get_stream_format() > JOURNAL_FORMAT_MAX
) {
1073 dout(0) << "Journal " << jp
.front
<< " is in unknown format " << front_journal
->get_stream_format()
1074 << ", does this MDS daemon require upgrade?" << dendl
;
1076 std::lock_guard
l(mds
->mds_lock
);
1077 if (mds
->is_daemon_stopping()) {
1079 delete front_journal
;
1082 completion
->complete(-CEPHFS_EINVAL
);
1084 } else if (mds
->is_standby_replay() || front_journal
->get_stream_format() >= g_conf()->mds_journal_format
) {
1085 /* The journal is of configured format, or we are in standbyreplay and will
1086 * tolerate replaying old journals until we have to go active. Use front_journal as
1087 * our journaler attribute and complete */
1088 dout(4) << "Recovered journal " << jp
.front
<< " in format " << front_journal
->get_stream_format() << dendl
;
1090 std::lock_guard
l(mds
->mds_lock
);
1091 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1092 if (mds
->is_daemon_stopping()) {
1095 completion
->complete(0);
1098 /* Hand off to reformat routine, which will ultimately set the
1099 * completion when it has done its thing */
1100 dout(1) << "Journal " << jp
.front
<< " has old format "
1101 << front_journal
->get_stream_format() << ", it will now be updated" << dendl
;
1102 _reformat_journal(jp
, front_journal
, completion
);
1107 * Blocking rewrite of the journal to a new file, followed by
1108 * swap of journal pointer to point to the new one.
1110 * We write the new journal to the 'back' journal from the JournalPointer,
1111 * swapping pointers to make that one the front journal only when we have
1114 void MDLog::_reformat_journal(JournalPointer
const &jp_in
, Journaler
*old_journal
, MDSContext
*completion
)
1116 ceph_assert(!jp_in
.is_null());
1117 ceph_assert(completion
!= NULL
);
1118 ceph_assert(old_journal
!= NULL
);
1120 JournalPointer jp
= jp_in
;
1122 /* Set JournalPointer.back to the location we will write the new journal */
1123 inodeno_t primary_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
1124 inodeno_t secondary_ino
= MDS_INO_LOG_BACKUP_OFFSET
+ mds
->get_nodeid();
1125 jp
.back
= (jp
.front
== primary_ino
? secondary_ino
: primary_ino
);
1126 int write_result
= jp
.save(mds
->objecter
);
1127 ceph_assert(write_result
== 0);
1129 /* Create the new Journaler file */
1130 Journaler
*new_journal
= new Journaler("mdlog", jp
.back
,
1131 mds
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
, mds
->finisher
);
1132 dout(4) << "Writing new journal header " << jp
.back
<< dendl
;
1133 file_layout_t new_layout
= old_journal
->get_layout();
1134 new_journal
->set_writeable();
1135 new_journal
->create(&new_layout
, g_conf()->mds_journal_format
);
1137 /* Write the new journal header to RADOS */
1138 C_SaferCond write_head_wait
;
1139 new_journal
->write_head(&write_head_wait
);
1140 write_head_wait
.wait();
1142 // Read in the old journal, and whenever we have readable events,
1143 // write them to the new journal.
1146 // In old format journals before event_seq was introduced, the serialized
1147 // offset of a SubtreeMap message in the log is used as the unique ID for
1148 // a log segment. Because we change serialization, this will end up changing
1149 // for us, so we have to explicitly update the fields that point back to that
1151 std::map
<LogSegment::seq_t
, LogSegment::seq_t
> segment_pos_rewrite
;
1153 // The logic in here borrowed from replay_thread expects mds_lock to be held,
1154 // e.g. between checking readable and doing wait_for_readable so that journaler
1155 // state doesn't change in between.
1156 uint32_t events_transcribed
= 0;
1158 while (!old_journal
->is_readable() &&
1159 old_journal
->get_read_pos() < old_journal
->get_write_pos() &&
1160 !old_journal
->get_error()) {
1162 // Issue a journal prefetch
1163 C_SaferCond readable_waiter
;
1164 old_journal
->wait_for_readable(&readable_waiter
);
1166 // Wait for a journal prefetch to complete
1167 readable_waiter
.wait();
1169 if (old_journal
->get_error()) {
1170 r
= old_journal
->get_error();
1171 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1175 if (!old_journal
->is_readable() &&
1176 old_journal
->get_read_pos() == old_journal
->get_write_pos())
1179 // Read one serialized LogEvent
1180 ceph_assert(old_journal
->is_readable());
1182 uint64_t le_pos
= old_journal
->get_read_pos();
1183 bool r
= old_journal
->try_read_entry(bl
);
1184 if (!r
&& old_journal
->get_error())
1188 // Update segment_pos_rewrite
1189 auto le
= LogEvent::decode_event(bl
.cbegin());
1191 bool modified
= false;
1193 if (le
->get_type() == EVENT_SUBTREEMAP
||
1194 le
->get_type() == EVENT_RESETJOURNAL
) {
1195 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1196 if (sle
== NULL
|| sle
->event_seq
== 0) {
1197 // A non-explicit event seq: the effective sequence number
1198 // of this segment is it's position in the old journal and
1199 // the new effective sequence number will be its position
1200 // in the new journal.
1201 segment_pos_rewrite
[le_pos
] = new_journal
->get_write_pos();
1202 dout(20) << __func__
<< " discovered segment seq mapping "
1203 << le_pos
<< " -> " << new_journal
->get_write_pos() << dendl
;
1209 // Rewrite segment references if necessary
1210 EMetaBlob
*blob
= le
->get_metablob();
1212 modified
= blob
->rewrite_truncate_finish(mds
, segment_pos_rewrite
);
1215 // Zero-out expire_pos in subtreemap because offsets have changed
1216 // (expire_pos is just an optimization so it's safe to eliminate it)
1217 if (le
->get_type() == EVENT_SUBTREEMAP
1218 || le
->get_type() == EVENT_SUBTREEMAP_TEST
) {
1219 auto& sle
= dynamic_cast<ESubtreeMap
&>(*le
);
1220 dout(20) << __func__
<< " zeroing expire_pos in subtreemap event at "
1221 << le_pos
<< " seq=" << sle
.event_seq
<< dendl
;
1228 le
->encode_with_header(bl
, mds
->mdsmap
->get_up_features());
1231 // Failure from LogEvent::decode, our job is to change the journal wrapper,
1232 // not validate the contents, so pass it through.
1233 dout(1) << __func__
<< " transcribing un-decodable LogEvent at old position "
1234 << old_journal
->get_read_pos() << ", new position " << new_journal
->get_write_pos()
1238 // Write (buffered, synchronous) one serialized LogEvent
1239 events_transcribed
+= 1;
1240 new_journal
->append_entry(bl
);
1243 dout(1) << "Transcribed " << events_transcribed
<< " events, flushing new journal" << dendl
;
1244 C_SaferCond flush_waiter
;
1245 new_journal
->flush(&flush_waiter
);
1246 flush_waiter
.wait();
1248 // If failed to rewrite journal, leave the part written journal
1249 // as garbage to be cleaned up next startup.
1250 ceph_assert(r
== 0);
1252 /* Now that the new journal is safe, we can flip the pointers */
1253 inodeno_t
const tmp
= jp
.front
;
1256 write_result
= jp
.save(mds
->objecter
);
1257 ceph_assert(write_result
== 0);
1259 /* Delete the old journal to free space */
1260 dout(1) << "New journal flushed, erasing old journal" << dendl
;
1261 C_SaferCond erase_waiter
;
1262 old_journal
->erase(&erase_waiter
);
1263 int erase_result
= erase_waiter
.wait();
1264 ceph_assert(erase_result
== 0);
1266 std::lock_guard
l(mds
->mds_lock
);
1267 if (mds
->is_daemon_stopping()) {
1271 ceph_assert(journaler
== old_journal
);
1275 /* Update the pointer to reflect we're back in clean single journal state. */
1277 write_result
= jp
.save(mds
->objecter
);
1278 ceph_assert(write_result
== 0);
1280 /* Reset the Journaler object to its default state */
1281 dout(1) << "Journal rewrite complete, continuing with normal startup" << dendl
;
1282 if (mds
->is_daemon_stopping()) {
1286 journaler
= new_journal
;
1287 journaler
->set_readonly();
1288 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1290 /* Trigger completion */
1291 if (mds
->is_daemon_stopping()) {
1294 completion
->complete(0);
1299 // i am a separate thread
1300 void MDLog::_replay_thread()
1302 dout(10) << "_replay_thread start" << dendl
;
1308 while (!journaler
->is_readable() &&
1309 journaler
->get_read_pos() < journaler
->get_write_pos() &&
1310 !journaler
->get_error()) {
1311 C_SaferCond readable_waiter
;
1312 journaler
->wait_for_readable(&readable_waiter
);
1313 r
= readable_waiter
.wait();
1315 if (journaler
->get_error()) {
1316 r
= journaler
->get_error();
1317 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1318 if (r
== -CEPHFS_ENOENT
) {
1319 if (mds
->is_standby_replay()) {
1320 // journal has been trimmed by somebody else
1323 mds
->clog
->error() << "missing journal object";
1324 mds
->damaged_unlocked();
1325 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1327 } else if (r
== -CEPHFS_EINVAL
) {
1328 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1329 // this should only happen if you're following somebody else
1330 if(journaler
->is_readonly()) {
1331 dout(0) << "expire_pos is higher than read_pos, returning CEPHFS_EAGAIN" << dendl
;
1334 mds
->clog
->error() << "invalid journaler offsets";
1335 mds
->damaged_unlocked();
1336 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1339 /* re-read head and check it
1340 * Given that replay happens in a separate thread and
1341 * the MDS is going to either shut down or restart when
1342 * we return this error, doing it synchronously is fine
1343 * -- as long as we drop the main mds lock--. */
1344 C_SaferCond reread_fin
;
1345 journaler
->reread_head(&reread_fin
);
1346 int err
= reread_fin
.wait();
1348 if (err
== -CEPHFS_ENOENT
&& mds
->is_standby_replay()) {
1350 dout(1) << "Journal header went away while in standby replay, journal rewritten?"
1354 dout(0) << "got error while reading head: " << cpp_strerror(err
)
1357 mds
->clog
->error() << "error reading journal header";
1358 mds
->damaged_unlocked();
1359 ceph_abort(); // Should be unreachable because damaged() calls
1363 standby_trim_segments();
1364 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1365 dout(0) << "expire_pos is higher than read_pos, returning CEPHFS_EAGAIN" << dendl
;
1373 if (!journaler
->is_readable() &&
1374 journaler
->get_read_pos() == journaler
->get_write_pos())
1377 ceph_assert(journaler
->is_readable() || mds
->is_daemon_stopping());
1380 uint64_t pos
= journaler
->get_read_pos();
1382 bool r
= journaler
->try_read_entry(bl
);
1383 if (!r
&& journaler
->get_error())
1388 auto le
= LogEvent::decode_event(bl
.cbegin());
1390 dout(0) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1391 << " -- unable to decode event" << dendl
;
1392 dout(0) << "dump of unknown or corrupt event:\n";
1396 mds
->clog
->error() << "corrupt journal event at " << pos
<< "~"
1397 << bl
.length() << " / "
1398 << journaler
->get_write_pos();
1399 if (g_conf()->mds_log_skip_corrupt_events
) {
1402 mds
->damaged_unlocked();
1403 ceph_abort(); // Should be unreachable because damaged() calls
1408 le
->set_start_off(pos
);
1411 if (le
->get_type() == EVENT_SUBTREEMAP
||
1412 le
->get_type() == EVENT_RESETJOURNAL
) {
1413 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1414 if (sle
&& sle
->event_seq
> 0)
1415 event_seq
= sle
->event_seq
;
1418 segments
[event_seq
] = new LogSegment(event_seq
, pos
);
1419 logger
->set(l_mdl_seg
, segments
.size());
1424 // have we seen an import map yet?
1425 if (segments
.empty()) {
1426 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1427 << " " << le
->get_stamp() << " -- waiting for subtree_map. (skipping " << *le
<< ")" << dendl
;
1429 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1430 << " " << le
->get_stamp() << ": " << *le
<< dendl
;
1431 le
->_segment
= get_current_segment(); // replay may need this
1432 le
->_segment
->num_events
++;
1433 le
->_segment
->end
= journaler
->get_read_pos();
1437 std::lock_guard
l(mds
->mds_lock
);
1438 if (mds
->is_daemon_stopping()) {
1441 logger
->inc(l_mdl_replayed
);
1446 logger
->set(l_mdl_rdpos
, pos
);
1451 ceph_assert(journaler
->get_read_pos() == journaler
->get_write_pos());
1452 dout(10) << "_replay - complete, " << num_events
1453 << " events" << dendl
;
1455 logger
->set(l_mdl_expos
, journaler
->get_expire_pos());
1458 safe_pos
= journaler
->get_write_safe_pos();
1460 dout(10) << "_replay_thread kicking waiters" << dendl
;
1462 std::lock_guard
l(mds
->mds_lock
);
1463 if (mds
->is_daemon_stopping()) {
1466 pre_segments_size
= segments
.size(); // get num of logs when replay is finished
1467 finish_contexts(g_ceph_context
, waitfor_replay
, r
);
1470 dout(10) << "_replay_thread finish" << dendl
;
1473 void MDLog::standby_trim_segments()
1475 dout(10) << "standby_trim_segments" << dendl
;
1476 uint64_t expire_pos
= journaler
->get_expire_pos();
1477 dout(10) << " expire_pos=" << expire_pos
<< dendl
;
1479 mds
->mdcache
->open_file_table
.trim_destroyed_inos(expire_pos
);
1481 bool removed_segment
= false;
1482 while (have_any_segments()) {
1483 LogSegment
*seg
= get_oldest_segment();
1484 dout(10) << " segment seq=" << seg
->seq
<< " " << seg
->offset
<<
1485 "~" << seg
->end
- seg
->offset
<< dendl
;
1487 if (seg
->end
> expire_pos
) {
1488 dout(10) << " won't remove, not expired!" << dendl
;
1492 if (segments
.size() == 1) {
1493 dout(10) << " won't remove, last segment!" << dendl
;
1497 dout(10) << " removing segment" << dendl
;
1498 mds
->mdcache
->standby_trim_segment(seg
);
1499 remove_oldest_segment();
1500 removed_segment
= true;
1503 if (removed_segment
) {
1504 dout(20) << " calling mdcache->trim!" << dendl
;
1505 mds
->mdcache
->trim();
1507 dout(20) << " removed no segments!" << dendl
;
1511 void MDLog::dump_replay_status(Formatter
*f
) const
1513 f
->open_object_section("replay_status");
1514 f
->dump_unsigned("journal_read_pos", journaler
? journaler
->get_read_pos() : 0);
1515 f
->dump_unsigned("journal_write_pos", journaler
? journaler
->get_write_pos() : 0);
1516 f
->dump_unsigned("journal_expire_pos", journaler
? journaler
->get_expire_pos() : 0);
1517 f
->dump_unsigned("num_events", get_num_events());
1518 f
->dump_unsigned("num_segments", get_num_segments());