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
|
/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __conn_dhandle_config_clear --
* Clear the underlying object's configuration information.
*/
static void
__conn_dhandle_config_clear(WT_SESSION_IMPL *session)
{
WT_DATA_HANDLE *dhandle;
const char **a;
dhandle = session->dhandle;
if (dhandle->cfg == NULL)
return;
for (a = dhandle->cfg; *a != NULL; ++a)
__wt_free(session, *a);
__wt_free(session, dhandle->cfg);
}
/*
* __conn_dhandle_config_set --
* Set up a btree handle's configuration information.
*/
static int
__conn_dhandle_config_set(WT_SESSION_IMPL *session)
{
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
char *metaconf;
dhandle = session->dhandle;
/*
* Read the object's entry from the metadata file, we're done if we
* don't find one.
*/
if ((ret =
__wt_metadata_search(session, dhandle->name, &metaconf)) != 0) {
if (ret == WT_NOTFOUND)
ret = ENOENT;
WT_RET(ret);
}
/*
* The defaults are included because persistent configuration
* information is stored in the metadata file and it may be from an
* earlier version of WiredTiger. If defaults are included in the
* configuration, we can add new configuration strings without
* upgrading the metadata file or writing special code in case a
* configuration string isn't initialized, as long as the new
* configuration string has an appropriate default value.
*
* The error handling is a little odd, but be careful: we're holding a
* chunk of allocated memory in metaconf. If we fail before we copy a
* reference to it into the object's configuration array, we must free
* it, after the copy, we don't want to free it.
*/
WT_ERR(__wt_calloc_def(session, 3, &dhandle->cfg));
switch (dhandle->type) {
case WT_DHANDLE_TYPE_BTREE:
WT_ERR(__wt_strdup(session,
WT_CONFIG_BASE(session, file_meta), &dhandle->cfg[0]));
break;
case WT_DHANDLE_TYPE_TABLE:
WT_ERR(__wt_strdup(session,
WT_CONFIG_BASE(session, table_meta), &dhandle->cfg[0]));
break;
}
dhandle->cfg[1] = metaconf;
return (0);
err: __wt_free(session, metaconf);
return (ret);
}
/*
* __conn_dhandle_destroy --
* Destroy a data handle.
*/
static int
__conn_dhandle_destroy(WT_SESSION_IMPL *session, WT_DATA_HANDLE *dhandle)
{
WT_DECL_RET;
switch (dhandle->type) {
case WT_DHANDLE_TYPE_BTREE:
WT_WITH_DHANDLE(session, dhandle,
ret = __wt_btree_discard(session));
break;
case WT_DHANDLE_TYPE_TABLE:
ret = __wt_schema_close_table(session, (WT_TABLE *)dhandle);
break;
}
__wt_rwlock_destroy(session, &dhandle->rwlock);
__wt_free(session, dhandle->name);
__wt_free(session, dhandle->checkpoint);
__conn_dhandle_config_clear(session);
__wt_spin_destroy(session, &dhandle->close_lock);
__wt_stat_dsrc_discard(session, dhandle);
__wt_overwrite_and_free(session, dhandle);
return (ret);
}
/*
* __wt_conn_dhandle_alloc --
* Allocate a new data handle and return it linked into the connection's
* list.
*/
int
__wt_conn_dhandle_alloc(
WT_SESSION_IMPL *session, const char *uri, const char *checkpoint)
{
WT_BTREE *btree;
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
WT_TABLE *table;
uint64_t bucket;
/*
* Ensure no one beat us to creating the handle now that we hold the
* write lock.
*/
if ((ret =
__wt_conn_dhandle_find(session, uri, checkpoint)) != WT_NOTFOUND)
return (ret);
if (WT_PREFIX_MATCH(uri, "file:")) {
WT_RET(__wt_calloc_one(session, &dhandle));
dhandle->type = WT_DHANDLE_TYPE_BTREE;
} else if (WT_PREFIX_MATCH(uri, "table:")) {
WT_RET(__wt_calloc_one(session, &table));
dhandle = &table->iface;
dhandle->type = WT_DHANDLE_TYPE_TABLE;
} else
return (__wt_illegal_value(session, NULL));
/* Btree handles keep their data separate from the interface. */
if (dhandle->type == WT_DHANDLE_TYPE_BTREE) {
WT_ERR(__wt_calloc_one(session, &btree));
dhandle->handle = btree;
btree->dhandle = dhandle;
}
if (strcmp(uri, WT_METAFILE_URI) == 0)
F_SET(dhandle, WT_DHANDLE_IS_METADATA);
WT_ERR(__wt_rwlock_init(session, &dhandle->rwlock));
dhandle->name_hash = __wt_hash_city64(uri, strlen(uri));
WT_ERR(__wt_strdup(session, uri, &dhandle->name));
WT_ERR(__wt_strdup(session, checkpoint, &dhandle->checkpoint));
WT_ERR(__wt_spin_init(
session, &dhandle->close_lock, "data handle close"));
/*
* We are holding the data handle list lock, which protects most
* threads from seeing the new handle until that lock is released.
*
* However, the sweep server scans the list of handles without holding
* that lock, so we need a write barrier here to ensure the sweep
* server doesn't see a partially filled in structure.
*/
WT_WRITE_BARRIER();
/*
* Prepend the handle to the connection list, assuming we're likely to
* need new files again soon, until they are cached by all sessions.
*/
bucket = dhandle->name_hash % WT_HASH_ARRAY_SIZE;
WT_CONN_DHANDLE_INSERT(S2C(session), dhandle, bucket);
session->dhandle = dhandle;
return (0);
err: WT_TRET(__conn_dhandle_destroy(session, dhandle));
return (ret);
}
/*
* __wt_conn_dhandle_find --
* Find a previously opened data handle.
*/
int
__wt_conn_dhandle_find(
WT_SESSION_IMPL *session, const char *uri, const char *checkpoint)
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
uint64_t bucket;
conn = S2C(session);
/* We must be holding the handle list lock at a higher level. */
WT_ASSERT(session, F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST));
bucket = __wt_hash_city64(uri, strlen(uri)) % WT_HASH_ARRAY_SIZE;
if (checkpoint == NULL) {
TAILQ_FOREACH(dhandle, &conn->dhhash[bucket], hashq) {
if (F_ISSET(dhandle, WT_DHANDLE_DEAD))
continue;
if (dhandle->checkpoint == NULL &&
strcmp(uri, dhandle->name) == 0) {
session->dhandle = dhandle;
return (0);
}
}
} else
TAILQ_FOREACH(dhandle, &conn->dhhash[bucket], hashq) {
if (F_ISSET(dhandle, WT_DHANDLE_DEAD))
continue;
if (dhandle->checkpoint != NULL &&
strcmp(uri, dhandle->name) == 0 &&
strcmp(checkpoint, dhandle->checkpoint) == 0) {
session->dhandle = dhandle;
return (0);
}
}
return (WT_NOTFOUND);
}
/*
* __wt_conn_dhandle_close --
* Sync and close the underlying btree handle.
*/
int
__wt_conn_dhandle_close(
WT_SESSION_IMPL *session, bool final, bool mark_dead)
{
WT_BM *bm;
WT_BTREE *btree;
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
bool discard, is_btree, marked_dead, no_schema_lock;
conn = S2C(session);
dhandle = session->dhandle;
if (!F_ISSET(dhandle, WT_DHANDLE_OPEN))
return (0);
/*
* The only data handle type that uses the "handle" field is btree.
* For other data handle types, it should be NULL.
*/
is_btree = dhandle->type == WT_DHANDLE_TYPE_BTREE;
btree = is_btree ? dhandle->handle : NULL;
if (is_btree) {
/* Turn off eviction. */
WT_RET(__wt_evict_file_exclusive_on(session));
/* Reset the tree's eviction priority (if any). */
__wt_evict_priority_clear(session);
}
/*
* If we don't already have the schema lock, make it an error to try to
* acquire it. The problem is that we are holding an exclusive lock on
* the handle, and if we attempt to acquire the schema lock we might
* deadlock with a thread that has the schema lock and wants a handle
* lock.
*/
no_schema_lock = false;
if (!F_ISSET(session, WT_SESSION_LOCKED_SCHEMA)) {
no_schema_lock = true;
F_SET(session, WT_SESSION_NO_SCHEMA_LOCK);
}
/*
* We may not be holding the schema lock, and threads may be walking
* the list of open handles (for example, checkpoint). Acquire the
* handle's close lock. We don't have the sweep server acquire the
* handle's rwlock so we have to prevent races through the close code.
*/
__wt_spin_lock(session, &dhandle->close_lock);
discard = marked_dead = false;
if (is_btree && !F_ISSET(btree,
WT_BTREE_SALVAGE | WT_BTREE_UPGRADE | WT_BTREE_VERIFY)) {
/*
* If the handle is already marked dead, we're just here to
* discard it.
*/
if (F_ISSET(dhandle, WT_DHANDLE_DEAD))
discard = true;
/*
* Mark the handle dead (letting the tree be discarded later) if
* it's not already marked dead, and it's not a memory-mapped
* tree. (We can't mark memory-mapped tree handles dead because
* we close the underlying file handle to allow the file to be
* removed and memory-mapped trees contain pointers into memory
* that become invalid if the mapping is closed.)
*/
bm = btree->bm;
if (!discard && mark_dead &&
(bm == NULL || !bm->is_mapped(bm, session)))
marked_dead = true;
/*
* Flush dirty data from any durable trees we couldn't mark
* dead. That involves writing a checkpoint, which can fail if
* an update cannot be written, causing the close to fail: if
* not the final close, return the EBUSY error to our caller
* for eventual retry.
*
* We can't discard non-durable trees yet: first we have to
* close the underlying btree handle, then we can mark the
* data handle dead.
*/
if (!discard && !marked_dead) {
if (F_ISSET(conn, WT_CONN_IN_MEMORY) ||
F_ISSET(btree, WT_BTREE_NO_CHECKPOINT))
discard = true;
else {
WT_TRET(__wt_checkpoint_close(session, final));
if (!final && ret == EBUSY)
WT_ERR(ret);
}
}
}
/* Close the underlying handle. */
switch (dhandle->type) {
case WT_DHANDLE_TYPE_BTREE:
WT_TRET(__wt_btree_close(session));
F_CLR(btree, WT_BTREE_SPECIAL_FLAGS);
break;
case WT_DHANDLE_TYPE_TABLE:
WT_TRET(__wt_schema_close_table(session, (WT_TABLE *)dhandle));
break;
}
/*
* If marking the handle dead, do so after closing the underlying btree.
* (Don't do it before that, the block manager asserts there are never
* two references to a block manager object, and re-opening the handle
* can succeed once we mark this handle dead.)
*
* Check discard too, code we call to clear the cache expects the data
* handle dead flag to be set when discarding modified pages.
*/
if (marked_dead || discard)
F_SET(dhandle, WT_DHANDLE_DEAD);
/*
* Discard from cache any trees not marked dead in this call (that is,
* including trees previously marked dead). Done after marking the data
* handle dead for a couple reasons: first, we don't need to hold an
* exclusive handle to do it, second, code we call to clear the cache
* expects the data handle dead flag to be set when discarding modified
* pages.
*/
if (discard)
WT_TRET(__wt_cache_op(session, WT_SYNC_DISCARD));
/*
* If we marked a handle dead it will be closed by sweep, via another
* call to this function. Otherwise, we're done with this handle.
*/
if (!marked_dead) {
F_CLR(dhandle, WT_DHANDLE_OPEN);
if (dhandle->checkpoint == NULL)
--conn->open_btree_count;
}
WT_ASSERT(session,
F_ISSET(dhandle, WT_DHANDLE_DEAD) ||
!F_ISSET(dhandle, WT_DHANDLE_OPEN));
err: __wt_spin_unlock(session, &dhandle->close_lock);
if (no_schema_lock)
F_CLR(session, WT_SESSION_NO_SCHEMA_LOCK);
if (is_btree)
__wt_evict_file_exclusive_off(session);
return (ret);
}
/*
* __wt_conn_dhandle_open --
* Open the current data handle.
*/
int
__wt_conn_dhandle_open(
WT_SESSION_IMPL *session, const char *cfg[], uint32_t flags)
{
WT_BTREE *btree;
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
dhandle = session->dhandle;
btree = dhandle->handle;
WT_ASSERT(session,
F_ISSET(dhandle, WT_DHANDLE_EXCLUSIVE) &&
!LF_ISSET(WT_DHANDLE_LOCK_ONLY));
WT_ASSERT(session,
!F_ISSET(S2C(session), WT_CONN_CLOSING_NO_MORE_OPENS));
/* Turn off eviction. */
if (dhandle->type == WT_DHANDLE_TYPE_BTREE)
WT_RET(__wt_evict_file_exclusive_on(session));
/*
* If the handle is already open, it has to be closed so it can be
* reopened with a new configuration.
*
* This call can return EBUSY if there's an update in the tree that's
* not yet globally visible. That's not a problem because it can only
* happen when we're switching from a normal handle to a "special" one,
* so we're returning EBUSY to an attempt to verify or do other special
* operations. The reverse won't happen because when the handle from a
* verify or other special operation is closed, there won't be updates
* in the tree that can block the close.
*/
if (F_ISSET(dhandle, WT_DHANDLE_OPEN))
WT_ERR(__wt_conn_dhandle_close(session, false, false));
/* Discard any previous configuration, set up the new configuration. */
__conn_dhandle_config_clear(session);
WT_ERR(__conn_dhandle_config_set(session));
switch (dhandle->type) {
case WT_DHANDLE_TYPE_BTREE:
/* Set any special flags on the btree handle. */
F_SET(btree, LF_MASK(WT_BTREE_SPECIAL_FLAGS));
/*
* Allocate data-source statistics memory. We don't allocate
* that memory when allocating the data handle because not all
* data handles need statistics (for example, handles used for
* checkpoint locking). If we are reopening the handle, then
* it may already have statistics memory, check to avoid the
* leak.
*/
if (dhandle->stat_array == NULL)
WT_ERR(__wt_stat_dsrc_init(session, dhandle));
WT_ERR(__wt_btree_open(session, cfg));
break;
case WT_DHANDLE_TYPE_TABLE:
WT_ERR(__wt_schema_open_table(session, cfg));
break;
}
/*
* Bulk handles require true exclusive access, otherwise, handles
* marked as exclusive are allowed to be relocked by the same
* session.
*/
if (F_ISSET(dhandle, WT_DHANDLE_EXCLUSIVE) &&
!LF_ISSET(WT_BTREE_BULK)) {
dhandle->excl_session = session;
dhandle->excl_ref = 1;
}
F_SET(dhandle, WT_DHANDLE_OPEN);
/*
* Checkpoint handles are read-only, so eviction calculations based on
* the number of btrees are better to ignore them.
*/
if (dhandle->checkpoint == NULL)
++S2C(session)->open_btree_count;
if (0) {
err: if (btree != NULL)
F_CLR(btree, WT_BTREE_SPECIAL_FLAGS);
}
if (dhandle->type == WT_DHANDLE_TYPE_BTREE)
__wt_evict_file_exclusive_off(session);
return (ret);
}
/*
* __conn_btree_apply_internal --
* Apply a function to an open data handle.
*/
static int
__conn_btree_apply_internal(WT_SESSION_IMPL *session, WT_DATA_HANDLE *dhandle,
int (*file_func)(WT_SESSION_IMPL *, const char *[]),
int (*name_func)(WT_SESSION_IMPL *, const char *, bool *),
const char *cfg[])
{
WT_DECL_RET;
bool skip;
/* Always apply the name function, if supplied. */
skip = false;
if (name_func != NULL)
WT_RET(name_func(session, dhandle->name, &skip));
/* If there is no file function, don't bother locking the handle */
if (file_func == NULL || skip)
return (0);
/*
* We need to pull the handle into the session handle cache and make
* sure it's referenced to stop other internal code dropping the handle
* (e.g in LSM when cleaning up obsolete chunks).
*/
if ((ret = __wt_session_get_dhandle(session,
dhandle->name, dhandle->checkpoint, NULL, 0)) != 0)
return (ret == EBUSY ? 0 : ret);
WT_SAVE_DHANDLE(session, ret = file_func(session, cfg));
WT_TRET(__wt_session_release_dhandle(session));
return (ret);
}
/*
* __wt_conn_btree_apply --
* Apply a function to all open btree handles with the given URI.
*/
int
__wt_conn_btree_apply(WT_SESSION_IMPL *session, const char *uri,
int (*file_func)(WT_SESSION_IMPL *, const char *[]),
int (*name_func)(WT_SESSION_IMPL *, const char *, bool *),
const char *cfg[])
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
uint64_t bucket;
conn = S2C(session);
/*
* If we're given a URI, then we walk only the hash list for that
* name. If we don't have a URI we walk the entire dhandle list.
*/
if (uri != NULL) {
bucket =
__wt_hash_city64(uri, strlen(uri)) % WT_HASH_ARRAY_SIZE;
for (dhandle = NULL;;) {
WT_WITH_HANDLE_LIST_READ_LOCK(session,
WT_DHANDLE_NEXT(session, dhandle,
&conn->dhhash[bucket], hashq));
if (dhandle == NULL)
return (0);
if (!F_ISSET(dhandle, WT_DHANDLE_OPEN) ||
F_ISSET(dhandle, WT_DHANDLE_DEAD) ||
dhandle->checkpoint != NULL ||
strcmp(uri, dhandle->name) != 0)
continue;
WT_ERR(__conn_btree_apply_internal(session,
dhandle, file_func, name_func, cfg));
}
} else {
for (dhandle = NULL;;) {
WT_WITH_HANDLE_LIST_READ_LOCK(session,
WT_DHANDLE_NEXT(session, dhandle, &conn->dhqh, q));
if (dhandle == NULL)
return (0);
if (!F_ISSET(dhandle, WT_DHANDLE_OPEN) ||
F_ISSET(dhandle, WT_DHANDLE_DEAD) ||
dhandle->type != WT_DHANDLE_TYPE_BTREE ||
dhandle->checkpoint != NULL ||
WT_IS_METADATA(dhandle))
continue;
WT_ERR(__conn_btree_apply_internal(session,
dhandle, file_func, name_func, cfg));
}
}
err: WT_DHANDLE_RELEASE(dhandle);
return (ret);
}
/*
* __conn_dhandle_close_one --
* Lock and, if necessary, close a data handle.
*/
static int
__conn_dhandle_close_one(WT_SESSION_IMPL *session,
const char *uri, const char *checkpoint, bool mark_dead)
{
WT_DECL_RET;
/*
* Lock the handle exclusively. If this is part of schema-changing
* operation (indicated by metadata tracking being enabled), hold the
* lock for the duration of the operation.
*/
WT_RET(__wt_session_get_dhandle(session, uri, checkpoint,
NULL, WT_DHANDLE_EXCLUSIVE | WT_DHANDLE_LOCK_ONLY));
if (WT_META_TRACKING(session))
WT_RET(__wt_meta_track_handle_lock(session, false));
/*
* We have an exclusive lock, which means there are no cursors open at
* this point. Close the handle, if necessary.
*/
if (F_ISSET(session->dhandle, WT_DHANDLE_OPEN)) {
__wt_meta_track_sub_on(session);
ret = __wt_conn_dhandle_close(session, false, mark_dead);
/*
* If the close succeeded, drop any locks it acquired. If
* there was a failure, this function will fail and the whole
* transaction will be rolled back.
*/
if (ret == 0)
ret = __wt_meta_track_sub_off(session);
}
if (!WT_META_TRACKING(session))
WT_TRET(__wt_session_release_dhandle(session));
return (ret);
}
/*
* __wt_conn_dhandle_close_all --
* Close all data handles handles with matching name (including all
* checkpoint handles).
*/
int
__wt_conn_dhandle_close_all(
WT_SESSION_IMPL *session, const char *uri, bool mark_dead)
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
uint64_t bucket;
conn = S2C(session);
WT_ASSERT(session,
F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE));
WT_ASSERT(session, session->dhandle == NULL);
/*
* Lock the live handle first. This ordering is important: we rely on
* locking the live handle to fail fast if the tree is busy (e.g., with
* cursors open or in a checkpoint).
*/
WT_ERR(__conn_dhandle_close_one(session, uri, NULL, mark_dead));
bucket = __wt_hash_city64(uri, strlen(uri)) % WT_HASH_ARRAY_SIZE;
TAILQ_FOREACH(dhandle, &conn->dhhash[bucket], hashq) {
if (strcmp(dhandle->name, uri) != 0 ||
dhandle->checkpoint == NULL ||
F_ISSET(dhandle, WT_DHANDLE_DEAD))
continue;
WT_ERR(__conn_dhandle_close_one(
session, dhandle->name, dhandle->checkpoint, mark_dead));
}
err: session->dhandle = NULL;
return (ret);
}
/*
* __conn_dhandle_remove --
* Remove a handle from the shared list.
*/
static int
__conn_dhandle_remove(WT_SESSION_IMPL *session, bool final)
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
uint64_t bucket;
conn = S2C(session);
dhandle = session->dhandle;
bucket = dhandle->name_hash % WT_HASH_ARRAY_SIZE;
WT_ASSERT(session,
F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE));
WT_ASSERT(session, dhandle != conn->cache->evict_file_next);
/* Check if the handle was reacquired by a session while we waited. */
if (!final &&
(dhandle->session_inuse != 0 || dhandle->session_ref != 0))
return (EBUSY);
WT_CONN_DHANDLE_REMOVE(conn, dhandle, bucket);
return (0);
}
/*
* __wt_conn_dhandle_discard_single --
* Close/discard a single data handle.
*/
int
__wt_conn_dhandle_discard_single(
WT_SESSION_IMPL *session, bool final, bool mark_dead)
{
WT_DATA_HANDLE *dhandle;
WT_DECL_RET;
int tret;
bool set_pass_intr;
dhandle = session->dhandle;
if (F_ISSET(dhandle, WT_DHANDLE_OPEN)) {
tret = __wt_conn_dhandle_close(session, final, mark_dead);
if (final && tret != 0) {
__wt_err(session, tret,
"Final close of %s failed", dhandle->name);
WT_TRET(tret);
} else if (!final)
WT_RET(tret);
}
/*
* Kludge: interrupt the eviction server in case it is holding the
* handle list lock.
*/
set_pass_intr = false;
if (!F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST)) {
set_pass_intr = true;
(void)__wt_atomic_addv32(&S2C(session)->cache->pass_intr, 1);
}
/* Try to remove the handle, protected by the data handle lock. */
WT_WITH_HANDLE_LIST_WRITE_LOCK(session,
tret = __conn_dhandle_remove(session, final));
if (set_pass_intr)
(void)__wt_atomic_subv32(&S2C(session)->cache->pass_intr, 1);
WT_TRET(tret);
/*
* After successfully removing the handle, clean it up.
*/
if (ret == 0 || final) {
WT_TRET(__conn_dhandle_destroy(session, dhandle));
session->dhandle = NULL;
}
return (ret);
}
/*
* __wt_conn_dhandle_discard --
* Close/discard all data handles.
*/
int
__wt_conn_dhandle_discard(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle, *dhandle_tmp;
WT_DECL_RET;
conn = S2C(session);
/*
* Empty the session cache: any data handles created in a connection
* method may be cached here, and we're about to close them.
*/
__wt_session_close_cache(session);
/*
* Close open data handles: first, everything apart from metadata and
* lookaside (as closing a normal file may write metadata and read
* lookaside entries). Then close whatever is left open.
*/
restart:
TAILQ_FOREACH(dhandle, &conn->dhqh, q) {
if (WT_IS_METADATA(dhandle) ||
strcmp(dhandle->name, WT_LAS_URI) == 0)
continue;
WT_WITH_DHANDLE(session, dhandle,
WT_TRET(__wt_conn_dhandle_discard_single(
session, true, F_ISSET(conn, WT_CONN_PANIC))));
goto restart;
}
/* Shut down the lookaside table after all eviction is complete. */
WT_TRET(__wt_las_destroy(session));
/*
* Closing the files may have resulted in entries on our default
* session's list of open data handles, specifically, we added the
* metadata file if any of the files were dirty. Clean up that list
* before we shut down the metadata entry, for good.
*/
__wt_session_close_cache(session);
F_SET(session, WT_SESSION_NO_DATA_HANDLES);
/*
* The connection may have an open metadata cursor handle. We cannot
* close it before now because it's potentially used when discarding
* other open data handles. Close it before discarding the underlying
* metadata handle.
*/
if (session->meta_cursor != NULL)
WT_TRET(session->meta_cursor->close(session->meta_cursor));
/* Close the remaining handles. */
WT_TAILQ_SAFE_REMOVE_BEGIN(dhandle, &conn->dhqh, q, dhandle_tmp) {
WT_WITH_DHANDLE(session, dhandle,
WT_TRET(__wt_conn_dhandle_discard_single(
session, true, F_ISSET(conn, WT_CONN_PANIC))));
} WT_TAILQ_SAFE_REMOVE_END
return (ret);
}
/*
* __wt_verbose_dump_handles --
* Dump information about all data handles.
*/
int
__wt_verbose_dump_handles(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
WT_DATA_HANDLE *dhandle;
conn = S2C(session);
WT_RET(__wt_msg(session, "%s", WT_DIVIDER));
WT_RET(__wt_msg(session, "Data handle dump:"));
for (dhandle = NULL;;) {
WT_WITH_HANDLE_LIST_READ_LOCK(session,
WT_DHANDLE_NEXT(session, dhandle, &conn->dhqh, q));
if (dhandle == NULL)
break;
WT_RET(__wt_msg(session, "Name: %s", dhandle->name));
if (dhandle->checkpoint != NULL)
WT_RET(__wt_msg(session,
"Checkpoint: %s", dhandle->checkpoint));
WT_RET(__wt_msg(session, " Sessions referencing handle: %"
PRIu32, dhandle->session_ref));
WT_RET(__wt_msg(session, " Sessions using handle: %"
PRId32, dhandle->session_inuse));
WT_RET(__wt_msg(session, " Exclusive references to handle: %"
PRIu32, dhandle->excl_ref));
if (dhandle->excl_ref != 0)
WT_RET(__wt_msg(session,
" Session with exclusive use: %p",
(void *)dhandle->excl_session));
WT_RET(__wt_msg(session,
" Flags: 0x%08" PRIx32, dhandle->flags));
}
return (0);
}
|