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
== -EBLACKLISTED
) {
101 derr
<< "we have been blacklisted (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
->mdsmap
->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
->mdsmap
->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 dout(10) << "Advancing to next stray directory on mds " << mds
->get_nodeid()
559 mds
->mdcache
->advance_stray();
562 void MDLog::_journal_segment_subtree_map(MDSContext
*onsync
)
564 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
566 dout(7) << __func__
<< dendl
;
567 ESubtreeMap
*sle
= mds
->mdcache
->create_subtree_map();
568 sle
->event_seq
= get_last_segment_seq();
570 _submit_entry(sle
, new C_MDL_Flushed(this, onsync
));
573 class C_OFT_Committed
: public MDSInternalContext
{
577 C_OFT_Committed(MDLog
*l
, uint64_t s
) :
578 MDSInternalContext(l
->mds
), mdlog(l
), seq(s
) {}
579 void finish(int ret
) override
{
580 mdlog
->trim_expired_segments();
584 void MDLog::trim(int m
)
586 unsigned max_segments
= g_conf()->mds_log_max_segments
;
587 int max_events
= g_conf()->mds_log_max_events
;
591 if (mds
->mdcache
->is_readonly()) {
592 dout(10) << "trim, ignoring read-only FS" << dendl
;
596 // Clamp max_events to not be smaller than events per segment
597 if (max_events
> 0 && max_events
<= g_conf()->mds_log_events_per_segment
) {
598 max_events
= g_conf()->mds_log_events_per_segment
+ 1;
605 << segments
.size() << " / " << max_segments
<< " segments, "
606 << num_events
<< " / " << max_events
<< " events"
607 << ", " << expiring_segments
.size() << " (" << expiring_events
<< ") expiring"
608 << ", " << expired_segments
.size() << " (" << expired_events
<< ") expired"
611 if (segments
.empty()) {
612 submit_mutex
.unlock();
616 // hack: only trim for a few seconds at a time
617 utime_t stop
= ceph_clock_now();
620 int op_prio
= CEPH_MSG_PRIO_LOW
+
621 (CEPH_MSG_PRIO_HIGH
- CEPH_MSG_PRIO_LOW
) *
622 expiring_segments
.size() / max_segments
;
623 if (op_prio
> CEPH_MSG_PRIO_HIGH
)
624 op_prio
= CEPH_MSG_PRIO_HIGH
;
626 unsigned new_expiring_segments
= 0;
628 unsigned max_expiring_segments
= 0;
629 if (pre_segments_size
> 0){
630 max_expiring_segments
= max_segments
/2;
631 assert(segments
.size() >= pre_segments_size
);
632 max_expiring_segments
= std::max
<unsigned>(max_expiring_segments
,segments
.size() - pre_segments_size
);
635 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
636 while (p
!= segments
.end()) {
637 if (stop
< ceph_clock_now())
640 unsigned num_remaining_segments
= (segments
.size() - expired_segments
.size() - expiring_segments
.size());
641 if ((num_remaining_segments
<= max_segments
) &&
642 (max_events
< 0 || num_events
- expiring_events
- expired_events
<= max_events
))
645 // Do not trim too many segments at once for peak workload. If mds keeps creating N segments each tick,
646 // the upper bound of 'num_remaining_segments - max_segments' is '2 * N'
647 if (new_expiring_segments
* 2 > num_remaining_segments
)
650 if (max_expiring_segments
> 0 &&
651 expiring_segments
.size() >= max_expiring_segments
)
654 // look at first segment
655 LogSegment
*ls
= p
->second
;
659 if (pending_events
.count(ls
->seq
) ||
660 ls
->end
> safe_pos
) {
661 dout(5) << "trim segment " << ls
->seq
<< "/" << ls
->offset
<< ", not fully flushed yet, safe "
662 << journaler
->get_write_safe_pos() << " < end " << ls
->end
<< dendl
;
666 if (expiring_segments
.count(ls
)) {
667 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
668 << ", " << ls
->num_events
<< " events" << dendl
;
669 } else if (expired_segments
.count(ls
)) {
670 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
671 << ", " << ls
->num_events
<< " events" << dendl
;
673 ceph_assert(expiring_segments
.count(ls
) == 0);
674 new_expiring_segments
++;
675 expiring_segments
.insert(ls
);
676 expiring_events
+= ls
->num_events
;
677 submit_mutex
.unlock();
679 uint64_t last_seq
= ls
->seq
;
680 try_expire(ls
, op_prio
);
683 p
= segments
.lower_bound(last_seq
+ 1);
688 !mds
->mdcache
->open_file_table
.is_any_committing()) {
689 uint64_t last_seq
= get_last_segment_seq();
690 if (mds
->mdcache
->open_file_table
.is_any_dirty() ||
691 last_seq
> mds
->mdcache
->open_file_table
.get_committed_log_seq()) {
692 submit_mutex
.unlock();
693 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
694 last_seq
, CEPH_MSG_PRIO_HIGH
);
699 // discard expired segments and unlock submit_mutex
700 _trim_expired_segments();
703 class C_MaybeExpiredSegment
: public MDSInternalContext
{
708 C_MaybeExpiredSegment(MDLog
*mdl
, LogSegment
*s
, int p
) :
709 MDSInternalContext(mdl
->mds
), mdlog(mdl
), ls(s
), op_prio(p
) {}
710 void finish(int res
) override
{
712 mdlog
->mds
->handle_write_error(res
);
713 mdlog
->_maybe_expired(ls
, op_prio
);
718 * Like MDLog::trim, but instead of trimming to max_segments, trim all but the latest
721 int MDLog::trim_all()
725 dout(10) << __func__
<< ": "
727 << "/" << expiring_segments
.size()
728 << "/" << expired_segments
.size() << dendl
;
730 uint64_t last_seq
= 0;
731 if (!segments
.empty()) {
732 last_seq
= get_last_segment_seq();
734 !mds
->mdcache
->open_file_table
.is_any_committing() &&
735 last_seq
> mds
->mdcache
->open_file_table
.get_committing_log_seq()) {
736 submit_mutex
.unlock();
737 mds
->mdcache
->open_file_table
.commit(new C_OFT_Committed(this, last_seq
),
738 last_seq
, CEPH_MSG_PRIO_DEFAULT
);
743 map
<uint64_t,LogSegment
*>::iterator p
= segments
.begin();
744 while (p
!= segments
.end() &&
745 p
->first
< last_seq
&&
746 p
->second
->end
< safe_pos
) { // next segment should have been started
747 LogSegment
*ls
= p
->second
;
750 // Caller should have flushed journaler before calling this
751 if (pending_events
.count(ls
->seq
)) {
752 dout(5) << __func__
<< ": segment " << ls
->seq
<< " has pending events" << dendl
;
753 submit_mutex
.unlock();
757 if (expiring_segments
.count(ls
)) {
758 dout(5) << "trim already expiring segment " << ls
->seq
<< "/" << ls
->offset
759 << ", " << ls
->num_events
<< " events" << dendl
;
760 } else if (expired_segments
.count(ls
)) {
761 dout(5) << "trim already expired segment " << ls
->seq
<< "/" << ls
->offset
762 << ", " << ls
->num_events
<< " events" << dendl
;
764 ceph_assert(expiring_segments
.count(ls
) == 0);
765 expiring_segments
.insert(ls
);
766 expiring_events
+= ls
->num_events
;
767 submit_mutex
.unlock();
769 uint64_t next_seq
= ls
->seq
+ 1;
770 try_expire(ls
, CEPH_MSG_PRIO_DEFAULT
);
773 p
= segments
.lower_bound(next_seq
);
777 _trim_expired_segments();
783 void MDLog::try_expire(LogSegment
*ls
, int op_prio
)
785 MDSGatherBuilder
gather_bld(g_ceph_context
);
786 ls
->try_to_expire(mds
, gather_bld
, op_prio
);
788 if (gather_bld
.has_subs()) {
789 dout(5) << "try_expire expiring segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
790 gather_bld
.set_finisher(new C_MaybeExpiredSegment(this, ls
, op_prio
));
791 gather_bld
.activate();
793 dout(10) << "try_expire expired segment " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
795 ceph_assert(expiring_segments
.count(ls
));
796 expiring_segments
.erase(ls
);
797 expiring_events
-= ls
->num_events
;
799 submit_mutex
.unlock();
802 logger
->set(l_mdl_segexg
, expiring_segments
.size());
803 logger
->set(l_mdl_evexg
, expiring_events
);
806 void MDLog::_maybe_expired(LogSegment
*ls
, int op_prio
)
808 if (mds
->mdcache
->is_readonly()) {
809 dout(10) << "_maybe_expired, ignoring read-only FS" << dendl
;
813 dout(10) << "_maybe_expired segment " << ls
->seq
<< "/" << ls
->offset
814 << ", " << ls
->num_events
<< " events" << dendl
;
815 try_expire(ls
, op_prio
);
818 void MDLog::_trim_expired_segments()
820 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
822 uint64_t oft_committed_seq
= mds
->mdcache
->open_file_table
.get_committed_log_seq();
824 // trim expired segments?
825 bool trimmed
= false;
826 while (!segments
.empty()) {
827 LogSegment
*ls
= segments
.begin()->second
;
828 if (!expired_segments
.count(ls
)) {
829 dout(10) << "_trim_expired_segments waiting for " << ls
->seq
<< "/" << ls
->offset
830 << " to expire" << dendl
;
834 if (!capped
&& ls
->seq
>= oft_committed_seq
) {
835 dout(10) << "_trim_expired_segments open file table committedseq " << oft_committed_seq
836 << " <= " << ls
->seq
<< "/" << ls
->offset
<< dendl
;
840 dout(10) << "_trim_expired_segments trimming expired "
841 << ls
->seq
<< "/0x" << std::hex
<< ls
->offset
<< std::dec
<< dendl
;
842 expired_events
-= ls
->num_events
;
843 expired_segments
.erase(ls
);
844 if (pre_segments_size
> 0)
846 num_events
-= ls
->num_events
;
848 // this was the oldest segment, adjust expire pos
849 if (journaler
->get_expire_pos() < ls
->end
) {
850 journaler
->set_expire_pos(ls
->end
);
851 logger
->set(l_mdl_expos
, ls
->end
);
853 logger
->set(l_mdl_expos
, ls
->offset
);
856 logger
->inc(l_mdl_segtrm
);
857 logger
->inc(l_mdl_evtrm
, ls
->num_events
);
859 segments
.erase(ls
->seq
);
864 submit_mutex
.unlock();
867 journaler
->write_head(0);
870 void MDLog::trim_expired_segments()
873 _trim_expired_segments();
876 void MDLog::_expired(LogSegment
*ls
)
878 ceph_assert(ceph_mutex_is_locked_by_me(submit_mutex
));
880 dout(5) << "_expired segment " << ls
->seq
<< "/" << ls
->offset
881 << ", " << ls
->num_events
<< " events" << dendl
;
883 if (!capped
&& ls
== peek_current_segment()) {
884 dout(5) << "_expired not expiring " << ls
->seq
<< "/" << ls
->offset
885 << ", last one and !capped" << dendl
;
888 expired_segments
.insert(ls
);
889 expired_events
+= ls
->num_events
;
891 // Trigger all waiters
892 finish_contexts(g_ceph_context
, ls
->expiry_waiters
);
894 logger
->inc(l_mdl_evex
, ls
->num_events
);
895 logger
->inc(l_mdl_segex
);
898 logger
->set(l_mdl_ev
, num_events
);
899 logger
->set(l_mdl_evexd
, expired_events
);
900 logger
->set(l_mdl_seg
, segments
.size());
901 logger
->set(l_mdl_segexd
, expired_segments
.size());
906 void MDLog::replay(MDSContext
*c
)
908 ceph_assert(journaler
->is_active());
909 ceph_assert(journaler
->is_readonly());
912 if (journaler
->get_read_pos() == journaler
->get_write_pos()) {
913 dout(10) << "replay - journal empty, done." << dendl
;
914 mds
->mdcache
->trim();
915 if (mds
->is_standby_replay())
916 mds
->update_mlogger();
925 waitfor_replay
.push_back(c
);
928 dout(10) << "replay start, from " << journaler
->get_read_pos()
929 << " to " << journaler
->get_write_pos() << dendl
;
931 ceph_assert(num_events
== 0 || already_replayed
);
932 if (already_replayed
) {
933 // Ensure previous instance of ReplayThread is joined before
934 // we create another one
935 replay_thread
.join();
937 already_replayed
= true;
939 replay_thread
.create("md_log_replay");
944 * Resolve the JournalPointer object to a journal file, and
945 * instantiate a Journaler object. This may re-write the journal
946 * if the journal in RADOS appears to be in an old format.
948 * This is a separate thread because of the way it is initialized from inside
949 * the mds lock, which is also the global objecter lock -- rather than split
950 * it up into hard-to-read async operations linked up by contexts,
952 * When this function completes, the `journaler` attribute will be set to
953 * a Journaler instance using the latest available serialization format.
955 void MDLog::_recovery_thread(MDSContext
*completion
)
957 ceph_assert(journaler
== NULL
);
958 if (g_conf()->mds_journal_format
> JOURNAL_FORMAT_MAX
) {
959 dout(0) << "Configuration value for mds_journal_format is out of bounds, max is "
960 << JOURNAL_FORMAT_MAX
<< dendl
;
962 // Oh dear, something unreadable in the store for this rank: require
963 // operator intervention.
965 ceph_abort(); // damaged should not return
968 // First, read the pointer object.
969 // If the pointer object is not present, then create it with
970 // front = default ino and back = null
971 JournalPointer
jp(mds
->get_nodeid(), mds
->mdsmap
->get_metadata_pool());
972 const int read_result
= jp
.load(mds
->objecter
);
973 if (read_result
== -ENOENT
) {
974 inodeno_t
const default_log_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
975 jp
.front
= default_log_ino
;
976 int write_result
= jp
.save(mds
->objecter
);
977 // Nothing graceful we can do for this
978 ceph_assert(write_result
>= 0);
979 } else if (read_result
== -EBLACKLISTED
) {
980 derr
<< "Blacklisted during JournalPointer read! Respawning..." << dendl
;
982 ceph_abort(); // Should be unreachable because respawn calls execv
983 } else if (read_result
!= 0) {
984 mds
->clog
->error() << "failed to read JournalPointer: " << read_result
985 << " (" << cpp_strerror(read_result
) << ")";
986 mds
->damaged_unlocked();
987 ceph_abort(); // Should be unreachable because damaged() calls respawn()
990 // If the back pointer is non-null, that means that a journal
991 // rewrite failed part way through. Erase the back journal
994 if (mds
->is_standby_replay()) {
995 dout(1) << "Journal " << jp
.front
<< " is being rewritten, "
996 << "cannot replay in standby until an active MDS completes rewrite" << dendl
;
997 std::lock_guard
l(mds
->mds_lock
);
998 if (mds
->is_daemon_stopping()) {
1001 completion
->complete(-EAGAIN
);
1004 dout(1) << "Erasing journal " << jp
.back
<< dendl
;
1005 C_SaferCond erase_waiter
;
1006 Journaler
back("mdlog", jp
.back
, mds
->mdsmap
->get_metadata_pool(),
1007 CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
,
1010 // Read all about this journal (header + extents)
1011 C_SaferCond recover_wait
;
1012 back
.recover(&recover_wait
);
1013 int recovery_result
= recover_wait
.wait();
1014 if (recovery_result
== -EBLACKLISTED
) {
1015 derr
<< "Blacklisted during journal recovery! Respawning..." << dendl
;
1017 ceph_abort(); // Should be unreachable because respawn calls execv
1018 } else if (recovery_result
!= 0) {
1019 // Journaler.recover succeeds if no journal objects are present: an error
1020 // means something worse like a corrupt header, which we can't handle here.
1021 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1022 << cpp_strerror(recovery_result
);
1023 mds
->damaged_unlocked();
1024 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1027 // We could read journal, so we can erase it.
1028 back
.erase(&erase_waiter
);
1029 int erase_result
= erase_waiter
.wait();
1031 // If we are successful, or find no data, we can update the JournalPointer to
1032 // reflect that the back journal is gone.
1033 if (erase_result
!= 0 && erase_result
!= -ENOENT
) {
1034 derr
<< "Failed to erase journal " << jp
.back
<< ": " << cpp_strerror(erase_result
) << dendl
;
1036 dout(1) << "Successfully erased journal, updating journal pointer" << dendl
;
1038 int write_result
= jp
.save(mds
->objecter
);
1039 // Nothing graceful we can do for this
1040 ceph_assert(write_result
>= 0);
1044 /* Read the header from the front journal */
1045 Journaler
*front_journal
= new Journaler("mdlog", jp
.front
,
1046 mds
->mdsmap
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
,
1047 logger
, l_mdl_jlat
, mds
->finisher
);
1049 // Assign to ::journaler so that we can be aborted by ::shutdown while
1050 // waiting for journaler recovery
1052 std::lock_guard
l(mds
->mds_lock
);
1053 journaler
= front_journal
;
1056 C_SaferCond recover_wait
;
1057 front_journal
->recover(&recover_wait
);
1058 dout(4) << "Waiting for journal " << jp
.front
<< " to recover..." << dendl
;
1059 int recovery_result
= recover_wait
.wait();
1060 dout(4) << "Journal " << jp
.front
<< " recovered." << dendl
;
1062 if (recovery_result
== -EBLACKLISTED
) {
1063 derr
<< "Blacklisted during journal recovery! Respawning..." << dendl
;
1065 ceph_abort(); // Should be unreachable because respawn calls execv
1066 } else if (recovery_result
!= 0) {
1067 mds
->clog
->error() << "Error recovering journal " << jp
.front
<< ": "
1068 << cpp_strerror(recovery_result
);
1069 mds
->damaged_unlocked();
1070 ceph_assert(recovery_result
== 0); // Unreachable because damaged() calls respawn()
1073 /* Check whether the front journal format is acceptable or needs re-write */
1074 if (front_journal
->get_stream_format() > JOURNAL_FORMAT_MAX
) {
1075 dout(0) << "Journal " << jp
.front
<< " is in unknown format " << front_journal
->get_stream_format()
1076 << ", does this MDS daemon require upgrade?" << dendl
;
1078 std::lock_guard
l(mds
->mds_lock
);
1079 if (mds
->is_daemon_stopping()) {
1081 delete front_journal
;
1084 completion
->complete(-EINVAL
);
1086 } else if (mds
->is_standby_replay() || front_journal
->get_stream_format() >= g_conf()->mds_journal_format
) {
1087 /* The journal is of configured format, or we are in standbyreplay and will
1088 * tolerate replaying old journals until we have to go active. Use front_journal as
1089 * our journaler attribute and complete */
1090 dout(4) << "Recovered journal " << jp
.front
<< " in format " << front_journal
->get_stream_format() << dendl
;
1092 std::lock_guard
l(mds
->mds_lock
);
1093 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1094 if (mds
->is_daemon_stopping()) {
1097 completion
->complete(0);
1100 /* Hand off to reformat routine, which will ultimately set the
1101 * completion when it has done its thing */
1102 dout(1) << "Journal " << jp
.front
<< " has old format "
1103 << front_journal
->get_stream_format() << ", it will now be updated" << dendl
;
1104 _reformat_journal(jp
, front_journal
, completion
);
1109 * Blocking rewrite of the journal to a new file, followed by
1110 * swap of journal pointer to point to the new one.
1112 * We write the new journal to the 'back' journal from the JournalPointer,
1113 * swapping pointers to make that one the front journal only when we have
1116 void MDLog::_reformat_journal(JournalPointer
const &jp_in
, Journaler
*old_journal
, MDSContext
*completion
)
1118 ceph_assert(!jp_in
.is_null());
1119 ceph_assert(completion
!= NULL
);
1120 ceph_assert(old_journal
!= NULL
);
1122 JournalPointer jp
= jp_in
;
1124 /* Set JournalPointer.back to the location we will write the new journal */
1125 inodeno_t primary_ino
= MDS_INO_LOG_OFFSET
+ mds
->get_nodeid();
1126 inodeno_t secondary_ino
= MDS_INO_LOG_BACKUP_OFFSET
+ mds
->get_nodeid();
1127 jp
.back
= (jp
.front
== primary_ino
? secondary_ino
: primary_ino
);
1128 int write_result
= jp
.save(mds
->objecter
);
1129 ceph_assert(write_result
== 0);
1131 /* Create the new Journaler file */
1132 Journaler
*new_journal
= new Journaler("mdlog", jp
.back
,
1133 mds
->mdsmap
->get_metadata_pool(), CEPH_FS_ONDISK_MAGIC
, mds
->objecter
, logger
, l_mdl_jlat
, mds
->finisher
);
1134 dout(4) << "Writing new journal header " << jp
.back
<< dendl
;
1135 file_layout_t new_layout
= old_journal
->get_layout();
1136 new_journal
->set_writeable();
1137 new_journal
->create(&new_layout
, g_conf()->mds_journal_format
);
1139 /* Write the new journal header to RADOS */
1140 C_SaferCond write_head_wait
;
1141 new_journal
->write_head(&write_head_wait
);
1142 write_head_wait
.wait();
1144 // Read in the old journal, and whenever we have readable events,
1145 // write them to the new journal.
1148 // In old format journals before event_seq was introduced, the serialized
1149 // offset of a SubtreeMap message in the log is used as the unique ID for
1150 // a log segment. Because we change serialization, this will end up changing
1151 // for us, so we have to explicitly update the fields that point back to that
1153 std::map
<LogSegment::seq_t
, LogSegment::seq_t
> segment_pos_rewrite
;
1155 // The logic in here borrowed from replay_thread expects mds_lock to be held,
1156 // e.g. between checking readable and doing wait_for_readable so that journaler
1157 // state doesn't change in between.
1158 uint32_t events_transcribed
= 0;
1160 while (!old_journal
->is_readable() &&
1161 old_journal
->get_read_pos() < old_journal
->get_write_pos() &&
1162 !old_journal
->get_error()) {
1164 // Issue a journal prefetch
1165 C_SaferCond readable_waiter
;
1166 old_journal
->wait_for_readable(&readable_waiter
);
1168 // Wait for a journal prefetch to complete
1169 readable_waiter
.wait();
1171 if (old_journal
->get_error()) {
1172 r
= old_journal
->get_error();
1173 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1177 if (!old_journal
->is_readable() &&
1178 old_journal
->get_read_pos() == old_journal
->get_write_pos())
1181 // Read one serialized LogEvent
1182 ceph_assert(old_journal
->is_readable());
1184 uint64_t le_pos
= old_journal
->get_read_pos();
1185 bool r
= old_journal
->try_read_entry(bl
);
1186 if (!r
&& old_journal
->get_error())
1190 // Update segment_pos_rewrite
1191 auto le
= LogEvent::decode_event(bl
.cbegin());
1193 bool modified
= false;
1195 if (le
->get_type() == EVENT_SUBTREEMAP
||
1196 le
->get_type() == EVENT_RESETJOURNAL
) {
1197 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1198 if (sle
== NULL
|| sle
->event_seq
== 0) {
1199 // A non-explicit event seq: the effective sequence number
1200 // of this segment is it's position in the old journal and
1201 // the new effective sequence number will be its position
1202 // in the new journal.
1203 segment_pos_rewrite
[le_pos
] = new_journal
->get_write_pos();
1204 dout(20) << __func__
<< " discovered segment seq mapping "
1205 << le_pos
<< " -> " << new_journal
->get_write_pos() << dendl
;
1211 // Rewrite segment references if necessary
1212 EMetaBlob
*blob
= le
->get_metablob();
1214 modified
= blob
->rewrite_truncate_finish(mds
, segment_pos_rewrite
);
1217 // Zero-out expire_pos in subtreemap because offsets have changed
1218 // (expire_pos is just an optimization so it's safe to eliminate it)
1219 if (le
->get_type() == EVENT_SUBTREEMAP
1220 || le
->get_type() == EVENT_SUBTREEMAP_TEST
) {
1221 auto& sle
= dynamic_cast<ESubtreeMap
&>(*le
);
1222 dout(20) << __func__
<< " zeroing expire_pos in subtreemap event at "
1223 << le_pos
<< " seq=" << sle
.event_seq
<< dendl
;
1230 le
->encode_with_header(bl
, mds
->mdsmap
->get_up_features());
1233 // Failure from LogEvent::decode, our job is to change the journal wrapper,
1234 // not validate the contents, so pass it through.
1235 dout(1) << __func__
<< " transcribing un-decodable LogEvent at old position "
1236 << old_journal
->get_read_pos() << ", new position " << new_journal
->get_write_pos()
1240 // Write (buffered, synchronous) one serialized LogEvent
1241 events_transcribed
+= 1;
1242 new_journal
->append_entry(bl
);
1245 dout(1) << "Transcribed " << events_transcribed
<< " events, flushing new journal" << dendl
;
1246 C_SaferCond flush_waiter
;
1247 new_journal
->flush(&flush_waiter
);
1248 flush_waiter
.wait();
1250 // If failed to rewrite journal, leave the part written journal
1251 // as garbage to be cleaned up next startup.
1252 ceph_assert(r
== 0);
1254 /* Now that the new journal is safe, we can flip the pointers */
1255 inodeno_t
const tmp
= jp
.front
;
1258 write_result
= jp
.save(mds
->objecter
);
1259 ceph_assert(write_result
== 0);
1261 /* Delete the old journal to free space */
1262 dout(1) << "New journal flushed, erasing old journal" << dendl
;
1263 C_SaferCond erase_waiter
;
1264 old_journal
->erase(&erase_waiter
);
1265 int erase_result
= erase_waiter
.wait();
1266 ceph_assert(erase_result
== 0);
1268 std::lock_guard
l(mds
->mds_lock
);
1269 if (mds
->is_daemon_stopping()) {
1273 ceph_assert(journaler
== old_journal
);
1277 /* Update the pointer to reflect we're back in clean single journal state. */
1279 write_result
= jp
.save(mds
->objecter
);
1280 ceph_assert(write_result
== 0);
1282 /* Reset the Journaler object to its default state */
1283 dout(1) << "Journal rewrite complete, continuing with normal startup" << dendl
;
1284 if (mds
->is_daemon_stopping()) {
1288 journaler
= new_journal
;
1289 journaler
->set_readonly();
1290 journaler
->set_write_error_handler(new C_MDL_WriteError(this));
1292 /* Trigger completion */
1293 if (mds
->is_daemon_stopping()) {
1296 completion
->complete(0);
1301 // i am a separate thread
1302 void MDLog::_replay_thread()
1304 dout(10) << "_replay_thread start" << dendl
;
1310 while (!journaler
->is_readable() &&
1311 journaler
->get_read_pos() < journaler
->get_write_pos() &&
1312 !journaler
->get_error()) {
1313 C_SaferCond readable_waiter
;
1314 journaler
->wait_for_readable(&readable_waiter
);
1315 r
= readable_waiter
.wait();
1317 if (journaler
->get_error()) {
1318 r
= journaler
->get_error();
1319 dout(0) << "_replay journaler got error " << r
<< ", aborting" << dendl
;
1321 if (mds
->is_standby_replay()) {
1322 // journal has been trimmed by somebody else
1325 mds
->clog
->error() << "missing journal object";
1326 mds
->damaged_unlocked();
1327 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1329 } else if (r
== -EINVAL
) {
1330 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1331 // this should only happen if you're following somebody else
1332 if(journaler
->is_readonly()) {
1333 dout(0) << "expire_pos is higher than read_pos, returning EAGAIN" << dendl
;
1336 mds
->clog
->error() << "invalid journaler offsets";
1337 mds
->damaged_unlocked();
1338 ceph_abort(); // Should be unreachable because damaged() calls respawn()
1341 /* re-read head and check it
1342 * Given that replay happens in a separate thread and
1343 * the MDS is going to either shut down or restart when
1344 * we return this error, doing it synchronously is fine
1345 * -- as long as we drop the main mds lock--. */
1346 C_SaferCond reread_fin
;
1347 journaler
->reread_head(&reread_fin
);
1348 int err
= reread_fin
.wait();
1350 if (err
== -ENOENT
&& mds
->is_standby_replay()) {
1352 dout(1) << "Journal header went away while in standby replay, journal rewritten?"
1356 dout(0) << "got error while reading head: " << cpp_strerror(err
)
1359 mds
->clog
->error() << "error reading journal header";
1360 mds
->damaged_unlocked();
1361 ceph_abort(); // Should be unreachable because damaged() calls
1365 standby_trim_segments();
1366 if (journaler
->get_read_pos() < journaler
->get_expire_pos()) {
1367 dout(0) << "expire_pos is higher than read_pos, returning EAGAIN" << dendl
;
1375 if (!journaler
->is_readable() &&
1376 journaler
->get_read_pos() == journaler
->get_write_pos())
1379 ceph_assert(journaler
->is_readable() || mds
->is_daemon_stopping());
1382 uint64_t pos
= journaler
->get_read_pos();
1384 bool r
= journaler
->try_read_entry(bl
);
1385 if (!r
&& journaler
->get_error())
1390 auto le
= LogEvent::decode_event(bl
.cbegin());
1392 dout(0) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1393 << " -- unable to decode event" << dendl
;
1394 dout(0) << "dump of unknown or corrupt event:\n";
1398 mds
->clog
->error() << "corrupt journal event at " << pos
<< "~"
1399 << bl
.length() << " / "
1400 << journaler
->get_write_pos();
1401 if (g_conf()->mds_log_skip_corrupt_events
) {
1404 mds
->damaged_unlocked();
1405 ceph_abort(); // Should be unreachable because damaged() calls
1410 le
->set_start_off(pos
);
1413 if (le
->get_type() == EVENT_SUBTREEMAP
||
1414 le
->get_type() == EVENT_RESETJOURNAL
) {
1415 auto sle
= dynamic_cast<ESubtreeMap
*>(le
.get());
1416 if (sle
&& sle
->event_seq
> 0)
1417 event_seq
= sle
->event_seq
;
1420 segments
[event_seq
] = new LogSegment(event_seq
, pos
);
1421 logger
->set(l_mdl_seg
, segments
.size());
1426 // have we seen an import map yet?
1427 if (segments
.empty()) {
1428 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1429 << " " << le
->get_stamp() << " -- waiting for subtree_map. (skipping " << *le
<< ")" << dendl
;
1431 dout(10) << "_replay " << pos
<< "~" << bl
.length() << " / " << journaler
->get_write_pos()
1432 << " " << le
->get_stamp() << ": " << *le
<< dendl
;
1433 le
->_segment
= get_current_segment(); // replay may need this
1434 le
->_segment
->num_events
++;
1435 le
->_segment
->end
= journaler
->get_read_pos();
1439 std::lock_guard
l(mds
->mds_lock
);
1440 if (mds
->is_daemon_stopping()) {
1443 logger
->inc(l_mdl_replayed
);
1448 logger
->set(l_mdl_rdpos
, pos
);
1453 ceph_assert(journaler
->get_read_pos() == journaler
->get_write_pos());
1454 dout(10) << "_replay - complete, " << num_events
1455 << " events" << dendl
;
1457 logger
->set(l_mdl_expos
, journaler
->get_expire_pos());
1460 safe_pos
= journaler
->get_write_safe_pos();
1462 dout(10) << "_replay_thread kicking waiters" << dendl
;
1464 std::lock_guard
l(mds
->mds_lock
);
1465 if (mds
->is_daemon_stopping()) {
1468 pre_segments_size
= segments
.size(); // get num of logs when replay is finished
1469 finish_contexts(g_ceph_context
, waitfor_replay
, r
);
1472 dout(10) << "_replay_thread finish" << dendl
;
1475 void MDLog::standby_trim_segments()
1477 dout(10) << "standby_trim_segments" << dendl
;
1478 uint64_t expire_pos
= journaler
->get_expire_pos();
1479 dout(10) << " expire_pos=" << expire_pos
<< dendl
;
1481 mds
->mdcache
->open_file_table
.trim_destroyed_inos(expire_pos
);
1483 bool removed_segment
= false;
1484 while (have_any_segments()) {
1485 LogSegment
*seg
= get_oldest_segment();
1486 dout(10) << " segment seq=" << seg
->seq
<< " " << seg
->offset
<<
1487 "~" << seg
->end
- seg
->offset
<< dendl
;
1489 if (seg
->end
> expire_pos
) {
1490 dout(10) << " won't remove, not expired!" << dendl
;
1494 if (segments
.size() == 1) {
1495 dout(10) << " won't remove, last segment!" << dendl
;
1499 dout(10) << " removing segment" << dendl
;
1500 mds
->mdcache
->standby_trim_segment(seg
);
1501 remove_oldest_segment();
1502 removed_segment
= true;
1505 if (removed_segment
) {
1506 dout(20) << " calling mdcache->trim!" << dendl
;
1507 mds
->mdcache
->trim();
1509 dout(20) << " removed no segments!" << dendl
;
1513 void MDLog::dump_replay_status(Formatter
*f
) const
1515 f
->open_object_section("replay_status");
1516 f
->dump_unsigned("journal_read_pos", journaler
? journaler
->get_read_pos() : 0);
1517 f
->dump_unsigned("journal_write_pos", journaler
? journaler
->get_write_pos() : 0);
1518 f
->dump_unsigned("journal_expire_pos", journaler
? journaler
->get_expire_pos() : 0);
1519 f
->dump_unsigned("num_events", get_num_events());
1520 f
->dump_unsigned("num_segments", get_num_segments());