/
Server.cc
11406 lines (9789 loc) · 368 KB
/
Server.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <boost/lexical_cast.hpp>
#include "include/ceph_assert.h" // lexical_cast includes system assert.h
#include <boost/config/warning_disable.hpp>
#include <boost/fusion/include/std_pair.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include "MDSRank.h"
#include "Server.h"
#include "Locker.h"
#include "MDCache.h"
#include "MDLog.h"
#include "Migrator.h"
#include "MDBalancer.h"
#include "InoTable.h"
#include "SnapClient.h"
#include "Mutation.h"
#include "MetricsHandler.h"
#include "cephfs_features.h"
#include "MDSContext.h"
#include "msg/Messenger.h"
#include "osdc/Objecter.h"
#include "events/EUpdate.h"
#include "events/EPeerUpdate.h"
#include "events/ESession.h"
#include "events/EOpen.h"
#include "events/ECommitted.h"
#include "events/EPurged.h"
#include "include/stringify.h"
#include "include/filepath.h"
#include "common/errno.h"
#include "common/Timer.h"
#include "common/perf_counters.h"
#include "include/compat.h"
#include "osd/OSDMap.h"
#include <errno.h>
#include <list>
#include <regex>
#include <string_view>
#include <functional>
#include "common/config.h"
#include "msg/Message.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".server "
class ServerContext : public MDSContext {
protected:
Server *server;
MDSRank *get_mds() override
{
return server->mds;
}
public:
explicit ServerContext(Server *s) : server(s) {
ceph_assert(server != NULL);
}
};
class Batch_Getattr_Lookup : public BatchOp {
protected:
Server* server;
ceph::ref_t<MDRequestImpl> mdr;
std::vector<ceph::ref_t<MDRequestImpl>> batch_reqs;
int res = 0;
public:
Batch_Getattr_Lookup(Server* s, const ceph::ref_t<MDRequestImpl>& r)
: server(s), mdr(r) {
if (mdr->client_request->get_op() == CEPH_MDS_OP_LOOKUP)
mdr->batch_op_map = &mdr->dn[0].back()->batch_ops;
else
mdr->batch_op_map = &mdr->in[0]->batch_ops;
}
void add_request(const ceph::ref_t<MDRequestImpl>& r) override {
batch_reqs.push_back(r);
}
ceph::ref_t<MDRequestImpl> find_new_head() override {
while (!batch_reqs.empty()) {
auto r = std::move(batch_reqs.back());
batch_reqs.pop_back();
if (r->killed)
continue;
r->batch_op_map = mdr->batch_op_map;
mdr->batch_op_map = nullptr;
mdr = r;
return mdr;
}
return nullptr;
}
void _forward(mds_rank_t t) override {
MDCache* mdcache = server->mdcache;
mdcache->mds->forward_message_mds(mdr, t);
mdr->set_mds_stamp(ceph_clock_now());
for (auto& m : batch_reqs) {
if (!m->killed)
mdcache->request_forward(m, t);
}
batch_reqs.clear();
}
void _respond(int r) override {
mdr->set_mds_stamp(ceph_clock_now());
for (auto& m : batch_reqs) {
if (!m->killed) {
m->tracei = mdr->tracei;
m->tracedn = mdr->tracedn;
server->respond_to_request(m, r);
}
}
batch_reqs.clear();
server->reply_client_request(mdr, make_message<MClientReply>(*mdr->client_request, r));
}
void print(std::ostream& o) {
o << "[batch front=" << *mdr << "]";
}
};
class ServerLogContext : public MDSLogContextBase {
protected:
Server *server;
MDSRank *get_mds() override
{
return server->mds;
}
MDRequestRef mdr;
void pre_finish(int r) override {
if (mdr)
mdr->mark_event("journal_committed: ");
}
public:
explicit ServerLogContext(Server *s) : server(s) {
ceph_assert(server != NULL);
}
explicit ServerLogContext(Server *s, MDRequestRef& r) : server(s), mdr(r) {
ceph_assert(server != NULL);
}
};
void Server::create_logger()
{
PerfCountersBuilder plb(g_ceph_context, "mds_server", l_mdss_first, l_mdss_last);
plb.add_u64_counter(l_mdss_handle_client_request, "handle_client_request",
"Client requests", "hcr", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_handle_peer_request, "handle_peer_request",
"Peer requests", "hsr", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_handle_client_session,
"handle_client_session", "Client session messages", "hcs",
PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_cap_revoke_eviction, "cap_revoke_eviction",
"Cap Revoke Client Eviction", "cre", PerfCountersBuilder::PRIO_INTERESTING);
plb.add_u64_counter(l_mdss_cap_acquisition_throttle,
"cap_acquisition_throttle", "Cap acquisition throttle counter", "cat",
PerfCountersBuilder::PRIO_INTERESTING);
// fop latencies are useful
plb.set_prio_default(PerfCountersBuilder::PRIO_USEFUL);
plb.add_time_avg(l_mdss_req_lookuphash_latency, "req_lookuphash_latency",
"Request type lookup hash of inode latency");
plb.add_time_avg(l_mdss_req_lookupino_latency, "req_lookupino_latency",
"Request type lookup inode latency");
plb.add_time_avg(l_mdss_req_lookupparent_latency, "req_lookupparent_latency",
"Request type lookup parent latency");
plb.add_time_avg(l_mdss_req_lookupname_latency, "req_lookupname_latency",
"Request type lookup name latency");
plb.add_time_avg(l_mdss_req_lookup_latency, "req_lookup_latency",
"Request type lookup latency");
plb.add_time_avg(l_mdss_req_lookupsnap_latency, "req_lookupsnap_latency",
"Request type lookup snapshot latency");
plb.add_time_avg(l_mdss_req_getattr_latency, "req_getattr_latency",
"Request type get attribute latency");
plb.add_time_avg(l_mdss_req_setattr_latency, "req_setattr_latency",
"Request type set attribute latency");
plb.add_time_avg(l_mdss_req_setlayout_latency, "req_setlayout_latency",
"Request type set file layout latency");
plb.add_time_avg(l_mdss_req_setdirlayout_latency, "req_setdirlayout_latency",
"Request type set directory layout latency");
plb.add_time_avg(l_mdss_req_getvxattr_latency, "req_getvxattr_latency",
"Request type get virtual extended attribute latency");
plb.add_time_avg(l_mdss_req_setxattr_latency, "req_setxattr_latency",
"Request type set extended attribute latency");
plb.add_time_avg(l_mdss_req_rmxattr_latency, "req_rmxattr_latency",
"Request type remove extended attribute latency");
plb.add_time_avg(l_mdss_req_readdir_latency, "req_readdir_latency",
"Request type read directory latency");
plb.add_time_avg(l_mdss_req_setfilelock_latency, "req_setfilelock_latency",
"Request type set file lock latency");
plb.add_time_avg(l_mdss_req_getfilelock_latency, "req_getfilelock_latency",
"Request type get file lock latency");
plb.add_time_avg(l_mdss_req_create_latency, "req_create_latency",
"Request type create latency");
plb.add_time_avg(l_mdss_req_open_latency, "req_open_latency",
"Request type open latency");
plb.add_time_avg(l_mdss_req_mknod_latency, "req_mknod_latency",
"Request type make node latency");
plb.add_time_avg(l_mdss_req_link_latency, "req_link_latency",
"Request type link latency");
plb.add_time_avg(l_mdss_req_unlink_latency, "req_unlink_latency",
"Request type unlink latency");
plb.add_time_avg(l_mdss_req_rmdir_latency, "req_rmdir_latency",
"Request type remove directory latency");
plb.add_time_avg(l_mdss_req_rename_latency, "req_rename_latency",
"Request type rename latency");
plb.add_time_avg(l_mdss_req_mkdir_latency, "req_mkdir_latency",
"Request type make directory latency");
plb.add_time_avg(l_mdss_req_symlink_latency, "req_symlink_latency",
"Request type symbolic link latency");
plb.add_time_avg(l_mdss_req_lssnap_latency, "req_lssnap_latency",
"Request type list snapshot latency");
plb.add_time_avg(l_mdss_req_mksnap_latency, "req_mksnap_latency",
"Request type make snapshot latency");
plb.add_time_avg(l_mdss_req_rmsnap_latency, "req_rmsnap_latency",
"Request type remove snapshot latency");
plb.add_time_avg(l_mdss_req_renamesnap_latency, "req_renamesnap_latency",
"Request type rename snapshot latency");
plb.set_prio_default(PerfCountersBuilder::PRIO_DEBUGONLY);
plb.add_u64_counter(l_mdss_dispatch_client_request, "dispatch_client_request",
"Client requests dispatched");
plb.add_u64_counter(l_mdss_dispatch_peer_request, "dispatch_server_request",
"Server requests dispatched");
logger = plb.create_perf_counters();
g_ceph_context->get_perfcounters_collection()->add(logger);
}
Server::Server(MDSRank *m, MetricsHandler *metrics_handler) :
mds(m),
mdcache(mds->mdcache), mdlog(mds->mdlog),
inject_rename_corrupt_dentry_first(g_conf().get_val<double>("mds_inject_rename_corrupt_dentry_first")),
recall_throttle(g_conf().get_val<double>("mds_recall_max_decay_rate")),
metrics_handler(metrics_handler)
{
forward_all_requests_to_auth = g_conf().get_val<bool>("mds_forward_all_requests_to_auth");
replay_unsafe_with_closed_session = g_conf().get_val<bool>("mds_replay_unsafe_with_closed_session");
cap_revoke_eviction_timeout = g_conf().get_val<double>("mds_cap_revoke_eviction_timeout");
max_snaps_per_dir = g_conf().get_val<uint64_t>("mds_max_snaps_per_dir");
delegate_inos_pct = g_conf().get_val<uint64_t>("mds_client_delegate_inos_pct");
max_caps_per_client = g_conf().get_val<uint64_t>("mds_max_caps_per_client");
cap_acquisition_throttle = g_conf().get_val<uint64_t>("mds_session_cap_acquisition_throttle");
max_caps_throttle_ratio = g_conf().get_val<double>("mds_session_max_caps_throttle_ratio");
caps_throttle_retry_request_timeout = g_conf().get_val<double>("mds_cap_acquisition_throttle_retry_request_timeout");
dir_max_entries = g_conf().get_val<uint64_t>("mds_dir_max_entries");
supported_features = feature_bitset_t(CEPHFS_FEATURES_MDS_SUPPORTED);
supported_metric_spec = feature_bitset_t(CEPHFS_METRIC_FEATURES_ALL);
}
void Server::dispatch(const cref_t<Message> &m)
{
switch (m->get_type()) {
case CEPH_MSG_CLIENT_RECONNECT:
handle_client_reconnect(ref_cast<MClientReconnect>(m));
return;
}
/*
*In reconnect phase, client sent unsafe requests to mds before reconnect msg. Seting sessionclosed_isok will handle scenario like this:
1. In reconnect phase, client sent unsafe requests to mds.
2. It reached reconnect timeout. All sessions without sending reconnect msg in time, some of which may had sent unsafe requests, are marked as closed.
(Another situation is #31668, which will deny all client reconnect msg to speed up reboot).
3.So these unsafe request from session without sending reconnect msg in time or being denied could be handled in clientreplay phase.
*/
bool sessionclosed_isok = replay_unsafe_with_closed_session;
// active?
// handle_peer_request()/handle_client_session() will wait if necessary
if (m->get_type() == CEPH_MSG_CLIENT_REQUEST && !mds->is_active()) {
const auto &req = ref_cast<MClientRequest>(m);
if (mds->is_reconnect() || mds->get_want_state() == CEPH_MDS_STATE_RECONNECT) {
Session *session = mds->get_session(req);
if (!session || (!session->is_open() && !sessionclosed_isok)) {
dout(5) << "session is closed, dropping " << req->get_reqid() << dendl;
return;
}
bool queue_replay = false;
if (req->is_replay() || req->is_async()) {
dout(3) << "queuing replayed op" << dendl;
queue_replay = true;
if (req->head.ino &&
!session->have_completed_request(req->get_reqid().tid, nullptr)) {
inodeno_t ino(req->head.ino);
mdcache->add_replay_ino_alloc(ino);
if (replay_unsafe_with_closed_session &&
session->free_prealloc_inos.contains(ino)) {
// don't purge inodes that will be created by later replay
session->free_prealloc_inos.erase(ino);
session->delegated_inos.insert(ino);
}
}
} else if (req->get_retry_attempt()) {
// process completed request in clientreplay stage. The completed request
// might have created new file/directorie. This guarantees MDS sends a reply
// to client before other request modifies the new file/directorie.
if (session->have_completed_request(req->get_reqid().tid, NULL)) {
dout(3) << "queuing completed op" << dendl;
queue_replay = true;
}
// this request was created before the cap reconnect message, drop any embedded
// cap releases.
req->releases.clear();
}
if (queue_replay) {
req->mark_queued_for_replay();
mds->enqueue_replay(new C_MDS_RetryMessage(mds, m));
return;
}
}
bool wait_for_active = true;
if (mds->is_stopping()) {
wait_for_active = false;
} else if (mds->is_clientreplay()) {
if (req->is_queued_for_replay()) {
wait_for_active = false;
}
}
if (wait_for_active) {
dout(3) << "not active yet, waiting" << dendl;
mds->wait_for_active(new C_MDS_RetryMessage(mds, m));
return;
}
}
switch (m->get_type()) {
case CEPH_MSG_CLIENT_SESSION:
handle_client_session(ref_cast<MClientSession>(m));
return;
case CEPH_MSG_CLIENT_REQUEST:
handle_client_request(ref_cast<MClientRequest>(m));
return;
case CEPH_MSG_CLIENT_REPLY:
handle_client_reply(ref_cast<MClientReply>(m));
return;
case CEPH_MSG_CLIENT_RECLAIM:
handle_client_reclaim(ref_cast<MClientReclaim>(m));
return;
case MSG_MDS_PEER_REQUEST:
handle_peer_request(ref_cast<MMDSPeerRequest>(m));
return;
default:
derr << "Server unknown message " << m->get_type() << " from peer type " << m->get_connection()->get_peer_type() << dendl;
ceph_abort_msg("server unknown message " + to_string(m->get_type()) + " from peer type " + to_string(m->get_connection()->get_peer_type()));
}
}
// ----------------------------------------------------------
// SESSION management
class C_MDS_session_finish : public ServerLogContext {
Session *session;
uint64_t state_seq;
bool open;
version_t cmapv;
interval_set<inodeno_t> inos_to_free;
version_t inotablev;
interval_set<inodeno_t> inos_to_purge;
LogSegment *ls = nullptr;
Context *fin;
public:
C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv, Context *fin_ = nullptr) :
ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv), inotablev(0), fin(fin_) { }
C_MDS_session_finish(Server *srv, Session *se, uint64_t sseq, bool s, version_t mv,
const interval_set<inodeno_t>& to_free, version_t iv,
const interval_set<inodeno_t>& to_purge, LogSegment *_ls, Context *fin_ = nullptr) :
ServerLogContext(srv), session(se), state_seq(sseq), open(s), cmapv(mv),
inos_to_free(to_free), inotablev(iv), inos_to_purge(to_purge), ls(_ls), fin(fin_) {}
void finish(int r) override {
ceph_assert(r == 0);
server->_session_logged(session, state_seq, open, cmapv, inos_to_free, inotablev, inos_to_purge, ls);
if (fin) {
fin->complete(r);
}
}
};
Session* Server::find_session_by_uuid(std::string_view uuid)
{
Session* session = nullptr;
for (auto& it : mds->sessionmap.get_sessions()) {
auto& metadata = it.second->info.client_metadata;
auto p = metadata.find("uuid");
if (p == metadata.end() || p->second != uuid)
continue;
if (!session) {
session = it.second;
} else if (!session->reclaiming_from) {
assert(it.second->reclaiming_from == session);
session = it.second;
} else {
assert(session->reclaiming_from == it.second);
}
}
return session;
}
void Server::reclaim_session(Session *session, const cref_t<MClientReclaim> &m)
{
if (!session->is_open() && !session->is_stale()) {
dout(10) << "session not open, dropping this req" << dendl;
return;
}
auto reply = make_message<MClientReclaimReply>(0);
if (m->get_uuid().empty()) {
dout(10) << __func__ << " invalid message (no uuid)" << dendl;
reply->set_result(-CEPHFS_EINVAL);
mds->send_message_client(reply, session);
return;
}
unsigned flags = m->get_flags();
if (flags != CEPH_RECLAIM_RESET) { // currently only support reset
dout(10) << __func__ << " unsupported flags" << dendl;
reply->set_result(-CEPHFS_EINVAL);
mds->send_message_client(reply, session);
return;
}
Session* target = find_session_by_uuid(m->get_uuid());
if (target) {
if (session->info.auth_name != target->info.auth_name) {
dout(10) << __func__ << " session auth_name " << session->info.auth_name
<< " != target auth_name " << target->info.auth_name << dendl;
reply->set_result(-CEPHFS_EPERM);
mds->send_message_client(reply, session);
}
assert(!target->reclaiming_from);
assert(!session->reclaiming_from);
session->reclaiming_from = target;
reply->set_addrs(entity_addrvec_t(target->info.inst.addr));
}
if (flags & CEPH_RECLAIM_RESET) {
finish_reclaim_session(session, reply);
} else ceph_assert(0); /* no other flags are handled at this time */
}
void Server::finish_reclaim_session(Session *session, const ref_t<MClientReclaimReply> &reply)
{
Session *target = session->reclaiming_from;
if (target) {
session->reclaiming_from = nullptr;
Context *send_reply;
if (reply) {
int64_t session_id = session->get_client().v;
send_reply = new LambdaContext([this, session_id, reply](int r) {
assert(ceph_mutex_is_locked_by_me(mds->mds_lock));
Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(session_id));
if (!session) {
return;
}
auto epoch = mds->objecter->with_osdmap([](const OSDMap &map){ return map.get_epoch(); });
reply->set_epoch(epoch);
mds->send_message_client(reply, session);
});
} else {
send_reply = nullptr;
}
bool blocklisted = mds->objecter->with_osdmap([target](const OSDMap &map) {
return map.is_blocklisted(target->info.inst.addr);
});
if (blocklisted || !g_conf()->mds_session_blocklist_on_evict) {
kill_session(target, send_reply);
} else {
CachedStackStringStream css;
mds->evict_client(target->get_client().v, false, true, *css, send_reply);
}
} else if (reply) {
mds->send_message_client(reply, session);
}
}
void Server::handle_client_reclaim(const cref_t<MClientReclaim> &m)
{
Session *session = mds->get_session(m);
uint32_t flags = m->get_flags();
dout(3) << __func__ << " " << *m << " from " << m->get_source() << dendl;
ceph_assert(m->is_a_client()); // should _not_ come from an mds!
if (!session) {
dout(0) << " ignoring sessionless msg " << *m << dendl;
return;
}
std::string_view fs_name = mds->get_fs_name();
if (!fs_name.empty() && !session->fs_name_capable(fs_name, MAY_READ)) {
dout(0) << " dropping message not allowed for this fs_name: " << *m << dendl;
return;
}
if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) {
mds->wait_for_replay(new C_MDS_RetryMessage(mds, m));
return;
}
if (flags & MClientReclaim::FLAG_FINISH) {
if (flags ^ MClientReclaim::FLAG_FINISH) {
dout(0) << __func__ << " client specified FLAG_FINISH with other flags."
" Other flags:" << flags << dendl;
auto reply = make_message<MClientReclaimReply>(0);
reply->set_result(-CEPHFS_EINVAL);
mds->send_message_client(reply, session);
return;
}
finish_reclaim_session(session);
} else {
reclaim_session(session, m);
}
}
void Server::handle_client_session(const cref_t<MClientSession> &m)
{
version_t pv;
Session *session = mds->get_session(m);
dout(3) << "handle_client_session " << *m << " from " << m->get_source() << dendl;
ceph_assert(m->is_a_client()); // should _not_ come from an mds!
if (!session) {
dout(0) << " ignoring sessionless msg " << *m << dendl;
auto reply = make_message<MClientSession>(CEPH_SESSION_REJECT);
reply->metadata["error_string"] = "sessionless";
mds->send_message(reply, m->get_connection());
return;
}
std::string_view fs_name = mds->get_fs_name();
if (!fs_name.empty() && !session->fs_name_capable(fs_name, MAY_READ)) {
dout(0) << " dropping message not allowed for this fs_name: " << *m << dendl;
auto reply = make_message<MClientSession>(CEPH_SESSION_REJECT);
reply->metadata["error_string"] = "client doesn't have caps for FS \"" +
std::string(fs_name) + "\"";
mds->send_message(std::move(reply), m->get_connection());
return;
}
if (m->get_op() == CEPH_SESSION_REQUEST_RENEWCAPS) {
// always handle renewcaps (state >= MDSMap::STATE_RECONNECT)
} else if (m->get_op() == CEPH_SESSION_REQUEST_CLOSE) {
// close requests need to be handled when mds is active
if (mds->get_state() < MDSMap::STATE_ACTIVE) {
mds->wait_for_active(new C_MDS_RetryMessage(mds, m));
return;
}
} else {
if (mds->get_state() < MDSMap::STATE_CLIENTREPLAY) {
mds->wait_for_replay(new C_MDS_RetryMessage(mds, m));
return;
}
}
if (logger)
logger->inc(l_mdss_handle_client_session);
uint64_t sseq = 0;
switch (m->get_op()) {
case CEPH_SESSION_REQUEST_OPEN:
if (session->is_opening() ||
session->is_open() ||
session->is_stale() ||
session->is_killing() ||
terminating_sessions) {
if (m->supported_features.test(CEPHFS_FEATURE_NOTIFY_SESSION_STATE)) {
if (session->is_open() && !mds->is_stopping()) {
dout(10) << "currently already opened" << dendl;
auto reply = make_message<MClientSession>(CEPH_SESSION_OPEN,
session->get_push_seq());
if (session->info.has_feature(CEPHFS_FEATURE_MIMIC))
reply->supported_features = supported_features;
mds->send_message_client(reply, session);
if (mdcache->is_readonly()) {
auto m = make_message<MClientSession>(CEPH_SESSION_FORCE_RO);
mds->send_message_client(m, session);
}
}
}
dout(10) << "currently " << session->get_state_name()
<< ", dropping this req" << dendl;
return;
}
ceph_assert(session->is_closed() || session->is_closing());
if (mds->is_stopping()) {
dout(10) << "mds is stopping, dropping open req" << dendl;
return;
}
{
auto& addr = session->info.inst.addr;
session->set_client_metadata(client_metadata_t(m->metadata, m->supported_features, m->metric_spec));
auto& client_metadata = session->info.client_metadata;
auto log_session_status = [this, m, session](std::string_view status, std::string_view err) {
auto now = ceph_clock_now();
auto throttle_elapsed = m->get_recv_complete_stamp() - m->get_throttle_stamp();
auto elapsed = now - m->get_recv_stamp();
CachedStackStringStream css;
*css << "New client session:"
<< " addr=\"" << session->info.inst.addr << "\""
<< ",elapsed=" << elapsed
<< ",throttled=" << throttle_elapsed
<< ",status=\"" << status << "\"";
if (!err.empty()) {
*css << ",error=\"" << err << "\"";
}
const auto& metadata = session->info.client_metadata;
if (auto it = metadata.find("root"); it != metadata.end()) {
*css << ",root=\"" << it->second << "\"";
}
dout(2) << css->strv() << dendl;
};
auto send_reject_message = [this, &session, &log_session_status](std::string_view err_str, unsigned flags=0) {
auto m = make_message<MClientSession>(CEPH_SESSION_REJECT, 0, flags);
if (session->info.has_feature(CEPHFS_FEATURE_MIMIC))
m->metadata["error_string"] = err_str;
mds->send_message_client(m, session);
log_session_status("REJECTED", err_str);
};
bool blocklisted = mds->objecter->with_osdmap(
[&addr](const OSDMap &osd_map) -> bool {
return osd_map.is_blocklisted(addr);
});
if (blocklisted) {
dout(10) << "rejecting blocklisted client " << addr << dendl;
// This goes on the wire and the "blacklisted" substring is
// depended upon by the kernel client for detecting whether it
// has been blocklisted. If mounted with recover_session=clean
// (since 5.4), it tries to automatically recover itself from
// blocklisting.
unsigned flags = 0;
flags |= MClientSession::SESSION_BLOCKLISTED;
send_reject_message("blocklisted (blacklisted)", flags);
session->clear();
break;
}
if (client_metadata.features.empty())
infer_supported_features(session, client_metadata);
dout(20) << __func__ << " CEPH_SESSION_REQUEST_OPEN metadata entries:" << dendl;
dout(20) << " features: '" << client_metadata.features << "'" << dendl;
dout(20) << " metric specification: [" << client_metadata.metric_spec << "]" << dendl;
for (const auto& p : client_metadata) {
dout(20) << " " << p.first << ": " << p.second << dendl;
}
feature_bitset_t missing_features = required_client_features;
missing_features -= client_metadata.features;
if (!missing_features.empty()) {
CachedStackStringStream css;
*css << "missing required features '" << missing_features << "'";
send_reject_message(css->strv());
mds->clog->warn() << "client session (" << session->info.inst
<< ") lacks required features " << missing_features
<< "; client supports " << client_metadata.features;
session->clear();
break;
}
// Special case for the 'root' metadata path; validate that the claimed
// root is actually within the caps of the session
if (auto it = client_metadata.find("root"); it != client_metadata.end()) {
auto claimed_root = it->second;
CachedStackStringStream css;
bool denied = false;
// claimed_root has a leading "/" which we strip before passing
// into caps check
if (claimed_root.empty() || claimed_root[0] != '/') {
denied = true;
*css << "invalue root '" << claimed_root << "'";
} else if (!session->auth_caps.path_capable(claimed_root.substr(1))) {
denied = true;
*css << "non-allowable root '" << claimed_root << "'";
}
if (denied) {
// Tell the client we're rejecting their open
send_reject_message(css->strv());
mds->clog->warn() << "client session with " << css->strv()
<< " denied (" << session->info.inst << ")";
session->clear();
break;
}
}
if (auto it = client_metadata.find("uuid"); it != client_metadata.end()) {
if (find_session_by_uuid(it->second)) {
send_reject_message("duplicated session uuid");
mds->clog->warn() << "client session with duplicated session uuid '"
<< it->second << "' denied (" << session->info.inst << ")";
session->clear();
break;
}
}
if (session->is_closed()) {
mds->sessionmap.add_session(session);
}
pv = mds->sessionmap.mark_projected(session);
sseq = mds->sessionmap.set_state(session, Session::STATE_OPENING);
mds->sessionmap.touch_session(session);
auto fin = new LambdaContext([log_session_status = std::move(log_session_status)](int r){
ceph_assert(r == 0);
log_session_status("ACCEPTED", "");
});
mdlog->start_submit_entry(new ESession(m->get_source_inst(), true, pv, client_metadata),
new C_MDS_session_finish(this, session, sseq, true, pv, fin));
mdlog->flush();
}
break;
case CEPH_SESSION_REQUEST_RENEWCAPS:
if (session->is_open() || session->is_stale()) {
mds->sessionmap.touch_session(session);
if (session->is_stale()) {
mds->sessionmap.set_state(session, Session::STATE_OPEN);
mds->locker->resume_stale_caps(session);
mds->sessionmap.touch_session(session);
}
auto reply = make_message<MClientSession>(CEPH_SESSION_RENEWCAPS, m->get_seq());
mds->send_message_client(reply, session);
} else {
dout(10) << "ignoring renewcaps on non open|stale session (" << session->get_state_name() << ")" << dendl;
}
break;
case CEPH_SESSION_REQUEST_CLOSE:
{
if (session->is_closed() ||
session->is_closing() ||
session->is_killing()) {
dout(10) << "already closed|closing|killing, dropping this req" << dendl;
return;
}
if (session->is_importing()) {
dout(10) << "ignoring close req on importing session" << dendl;
return;
}
ceph_assert(session->is_open() ||
session->is_stale() ||
session->is_opening());
if (m->get_seq() < session->get_push_seq()) {
dout(10) << "old push seq " << m->get_seq() << " < " << session->get_push_seq()
<< ", dropping" << dendl;
return;
}
// We are getting a seq that is higher than expected.
// Handle the same as any other seqn error.
//
if (m->get_seq() != session->get_push_seq()) {
dout(0) << "old push seq " << m->get_seq() << " != " << session->get_push_seq()
<< ", BUGGY!" << dendl;
mds->clog->warn() << "incorrect push seq " << m->get_seq() << " != "
<< session->get_push_seq() << ", dropping" << " from client : " << session->get_human_name();
return;
}
journal_close_session(session, Session::STATE_CLOSING, NULL);
}
break;
case CEPH_SESSION_FLUSHMSG_ACK:
finish_flush_session(session, m->get_seq());
break;
case CEPH_SESSION_REQUEST_FLUSH_MDLOG:
if (mds->is_active())
mdlog->flush();
break;
default:
auto m = make_message<MClientSession>(CEPH_SESSION_REJECT);
mds->send_message_client(m, session);
derr << "Server received unknown message " << m->get_type() << ", closing session and blocklisting the client " << session->get_client() << dendl;
CachedStackStringStream css;
mds->evict_client(session->get_client().v, false, true, *css, nullptr);
}
}
void Server::flush_session(Session *session, MDSGatherBuilder& gather) {
if (!session->is_open() ||
!session->get_connection() ||
!session->get_connection()->has_feature(CEPH_FEATURE_EXPORT_PEER)) {
return;
}
version_t seq = session->wait_for_flush(gather.new_sub());
mds->send_message_client(
make_message<MClientSession>(CEPH_SESSION_FLUSHMSG, seq), session);
}
void Server::flush_client_sessions(set<client_t>& client_set, MDSGatherBuilder& gather)
{
for (const auto& client : client_set) {
Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(client.v));
ceph_assert(session);
flush_session(session, gather);
}
}
void Server::finish_flush_session(Session *session, version_t seq)
{
MDSContext::vec finished;
session->finish_flush(seq, finished);
mds->queue_waiters(finished);
}
void Server::_session_logged(Session *session, uint64_t state_seq, bool open, version_t pv,
const interval_set<inodeno_t>& inos_to_free, version_t piv,
const interval_set<inodeno_t>& inos_to_purge, LogSegment *ls)
{
dout(10) << "_session_logged " << session->info.inst
<< " state_seq " << state_seq
<< " " << (open ? "open":"close") << " " << pv
<< " inos_to_free " << inos_to_free << " inotablev " << piv
<< " inos_to_purge " << inos_to_purge << dendl;
if (!open) {
if (inos_to_purge.size()){
ceph_assert(ls);
session->info.prealloc_inos.subtract(inos_to_purge);
ls->purging_inodes.insert(inos_to_purge);
if (mds->is_clientreplay() || mds->is_active() || mds->is_stopping())
mdcache->purge_inodes(inos_to_purge, ls);
}
if (inos_to_free.size()) {
ceph_assert(piv);
ceph_assert(session->is_closing() || session->is_killing() ||
session->is_opening()); // re-open closing session
session->info.prealloc_inos.subtract(inos_to_free);
mds->inotable->apply_release_ids(inos_to_free);
ceph_assert(mds->inotable->get_version() == piv);
}
session->free_prealloc_inos = session->info.prealloc_inos;
session->delegated_inos.clear();
}
mds->sessionmap.mark_dirty(session);
// apply
if (session->get_state_seq() != state_seq) {
dout(10) << " journaled state_seq " << state_seq << " != current " << session->get_state_seq()
<< ", noop" << dendl;
// close must have been canceled (by an import?), or any number of other things..
} else if (open) {
ceph_assert(session->is_opening());
mds->sessionmap.set_state(session, Session::STATE_OPEN);
mds->sessionmap.touch_session(session);
metrics_handler->add_session(session);
ceph_assert(session->get_connection());
auto reply = make_message<MClientSession>(CEPH_SESSION_OPEN);
if (session->info.has_feature(CEPHFS_FEATURE_MIMIC)) {
reply->supported_features = supported_features;
reply->metric_spec = supported_metric_spec;
}
mds->send_message_client(reply, session);
if (mdcache->is_readonly()) {
auto m = make_message<MClientSession>(CEPH_SESSION_FORCE_RO);
mds->send_message_client(m, session);
}
} else if (session->is_closing() ||
session->is_killing()) {
// kill any lingering capabilities, leases, requests
bool killing = session->is_killing();
while (!session->caps.empty()) {
Capability *cap = session->caps.front();
CInode *in = cap->get_inode();
dout(20) << " killing capability " << ccap_string(cap->issued()) << " on " << *in << dendl;
mds->locker->remove_client_cap(in, cap, killing);
}
while (!session->leases.empty()) {
ClientLease *r = session->leases.front();
CDentry *dn = static_cast<CDentry*>(r->parent);
dout(20) << " killing client lease of " << *dn << dendl;
dn->remove_client_lease(r, mds->locker);
}
if (client_reconnect_gather.erase(session->info.get_client())) {
dout(20) << " removing client from reconnect set" << dendl;
if (client_reconnect_gather.empty()) {
dout(7) << " client " << session->info.inst << " was last reconnect, finishing" << dendl;
reconnect_gather_finish();
}
}
if (client_reclaim_gather.erase(session->info.get_client())) {
dout(20) << " removing client from reclaim set" << dendl;
if (client_reclaim_gather.empty()) {
dout(7) << " client " << session->info.inst << " was last reclaimed, finishing" << dendl;
mds->maybe_clientreplay_done();
}
}
if (session->is_closing()) {
// mark con disposable. if there is a fault, we will get a
// reset and clean it up. if the client hasn't received the
// CLOSE message yet, they will reconnect and get an
// ms_handle_remote_reset() and realize they had in fact closed.
// do this *before* sending the message to avoid a possible
// race.
if (session->get_connection()) {
// Conditional because terminate_sessions will indiscrimately
// put sessions in CLOSING whether they ever had a conn or not.
session->get_connection()->mark_disposable();
}
// reset session
mds->send_message_client(make_message<MClientSession>(CEPH_SESSION_CLOSE), session);
mds->sessionmap.set_state(session, Session::STATE_CLOSED);
session->clear();
metrics_handler->remove_session(session);
mds->sessionmap.remove_session(session);
} else if (session->is_killing()) {
// destroy session, close connection
if (session->get_connection()) {
session->get_connection()->mark_down();
mds->sessionmap.set_state(session, Session::STATE_CLOSED);
session->set_connection(nullptr);
}
metrics_handler->remove_session(session);
mds->sessionmap.remove_session(session);
} else {
ceph_abort();
}
} else {
ceph_abort();
}
}
/**
* Inject sessions from some source other than actual connections.
*
* For example:
* - sessions inferred from journal replay
* - sessions learned from other MDSs during rejoin
* - sessions learned from other MDSs during dir/caps migration
* - sessions learned from other MDSs during a cross-MDS rename
*/
version_t Server::prepare_force_open_sessions(map<client_t,entity_inst_t>& cm,
map<client_t,client_metadata_t>& cmm,
map<client_t, pair<Session*,uint64_t> >& smap)
{
version_t pv = mds->sessionmap.get_projected();
dout(10) << "prepare_force_open_sessions " << pv
<< " on " << cm.size() << " clients"
<< dendl;
mds->objecter->with_osdmap(
[this, &cm, &cmm](const OSDMap &osd_map) {
for (auto p = cm.begin(); p != cm.end(); ) {
if (osd_map.is_blocklisted(p->second.addr)) {
dout(10) << " ignoring blocklisted client." << p->first
<< " (" << p->second.addr << ")" << dendl;
cmm.erase(p->first);
cm.erase(p++);
} else {
++p;
}
}
});