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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Portions Copyright (c) 2012 Martin Matuska <mm@FreeBSD.org>
*/
#include <sys/zfs_context.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/disk.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/vdev_impl.h>
#include <sys/fs/zfs.h>
#include <sys/zio.h>
#include <geom/geom.h>
#include <geom/geom_int.h>
/*
* Virtual device vector for GEOM.
*/
struct g_class zfs_vdev_class = {
.name = "ZFS::VDEV",
.version = G_VERSION,
};
DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
SYSCTL_DECL(_vfs_zfs_vdev);
/* Don't send BIO_FLUSH. */
static int vdev_geom_bio_flush_disable = 0;
TUNABLE_INT("vfs.zfs.vdev.bio_flush_disable", &vdev_geom_bio_flush_disable);
SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RW,
&vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
/* Don't send BIO_DELETE. */
static int vdev_geom_bio_delete_disable = 0;
TUNABLE_INT("vfs.zfs.vdev.bio_delete_disable", &vdev_geom_bio_delete_disable);
SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RW,
&vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE");
static void
vdev_geom_orphan(struct g_consumer *cp)
{
vdev_t *vd;
g_topology_assert();
vd = cp->private;
/*
* Orphan callbacks occur from the GEOM event thread.
* Concurrent with this call, new I/O requests may be
* working their way through GEOM about to find out
* (only once executed by the g_down thread) that we've
* been orphaned from our disk provider. These I/Os
* must be retired before we can detach our consumer.
* This is most easily achieved by acquiring the
* SPA ZIO configuration lock as a writer, but doing
* so with the GEOM topology lock held would cause
* a lock order reversal. Instead, rely on the SPA's
* async removal support to invoke a close on this
* vdev once it is safe to do so.
*/
zfs_post_remove(vd->vdev_spa, vd);
vd->vdev_remove_wanted = B_TRUE;
spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
}
static struct g_consumer *
vdev_geom_attach(struct g_provider *pp)
{
struct g_geom *gp;
struct g_consumer *cp;
g_topology_assert();
ZFS_LOG(1, "Attaching to %s.", pp->name);
/* Do we have geom already? No? Create one. */
LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
if (gp->flags & G_GEOM_WITHER)
continue;
if (strcmp(gp->name, "zfs::vdev") != 0)
continue;
break;
}
if (gp == NULL) {
gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
gp->orphan = vdev_geom_orphan;
cp = g_new_consumer(gp);
if (g_attach(cp, pp) != 0) {
g_wither_geom(gp, ENXIO);
return (NULL);
}
if (g_access(cp, 1, 0, 1) != 0) {
g_wither_geom(gp, ENXIO);
return (NULL);
}
ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
} else {
/* Check if we are already connected to this provider. */
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->provider == pp) {
ZFS_LOG(1, "Found consumer for %s.", pp->name);
break;
}
}
if (cp == NULL) {
cp = g_new_consumer(gp);
if (g_attach(cp, pp) != 0) {
g_destroy_consumer(cp);
return (NULL);
}
if (g_access(cp, 1, 0, 1) != 0) {
g_detach(cp);
g_destroy_consumer(cp);
return (NULL);
}
ZFS_LOG(1, "Created consumer for %s.", pp->name);
} else {
if (g_access(cp, 1, 0, 1) != 0)
return (NULL);
ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
}
}
return (cp);
}
static void
vdev_geom_detach(void *arg, int flag __unused)
{
struct g_geom *gp;
struct g_consumer *cp;
g_topology_assert();
cp = arg;
gp = cp->geom;
ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
g_access(cp, -1, 0, -1);
/* Destroy consumer on last close. */
if (cp->acr == 0 && cp->ace == 0) {
ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
if (cp->acw > 0)
g_access(cp, 0, -cp->acw, 0);
g_detach(cp);
g_destroy_consumer(cp);
}
/* Destroy geom if there are no consumers left. */
if (LIST_EMPTY(&gp->consumer)) {
ZFS_LOG(1, "Destroyed geom %s.", gp->name);
g_wither_geom(gp, ENXIO);
}
}
static uint64_t
nvlist_get_guid(nvlist_t *list)
{
uint64_t value;
value = 0;
nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, &value);
return (value);
}
static int
vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
{
struct bio *bp;
u_char *p;
off_t off, maxio;
int error;
ASSERT((offset % cp->provider->sectorsize) == 0);
ASSERT((size % cp->provider->sectorsize) == 0);
bp = g_alloc_bio();
off = offset;
offset += size;
p = data;
maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
error = 0;
for (; off < offset; off += maxio, p += maxio, size -= maxio) {
bzero(bp, sizeof(*bp));
bp->bio_cmd = cmd;
bp->bio_done = NULL;
bp->bio_offset = off;
bp->bio_length = MIN(size, maxio);
bp->bio_data = p;
g_io_request(bp, cp);
error = biowait(bp, "vdev_geom_io");
if (error != 0)
break;
}
g_destroy_bio(bp);
return (error);
}
static void
vdev_geom_taste_orphan(struct g_consumer *cp)
{
KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
cp->provider->name));
}
static int
vdev_geom_read_config(struct g_consumer *cp, nvlist_t **config)
{
struct g_provider *pp;
vdev_label_t *label;
char *p, *buf;
size_t buflen;
uint64_t psize;
off_t offset, size;
uint64_t guid, state, txg;
int error, l, len;
g_topology_assert_not();
pp = cp->provider;
ZFS_LOG(1, "Reading config from %s...", pp->name);
psize = pp->mediasize;
psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
size = sizeof(*label) + pp->sectorsize -
((sizeof(*label) - 1) % pp->sectorsize) - 1;
guid = 0;
label = kmem_alloc(size, KM_SLEEP);
buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
*config = NULL;
for (l = 0; l < VDEV_LABELS; l++) {
offset = vdev_label_offset(psize, l, 0);
if ((offset % pp->sectorsize) != 0)
continue;
if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
continue;
buf = label->vl_vdev_phys.vp_nvlist;
if (nvlist_unpack(buf, buflen, config, 0) != 0)
continue;
if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
&state) != 0 || state == POOL_STATE_DESTROYED ||
state > POOL_STATE_L2CACHE) {
nvlist_free(*config);
*config = NULL;
continue;
}
if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE &&
(nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
&txg) != 0 || txg == 0)) {
nvlist_free(*config);
*config = NULL;
continue;
}
break;
}
kmem_free(label, size);
return (*config == NULL ? ENOENT : 0);
}
static void
resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id)
{
nvlist_t **new_configs;
uint64_t i;
if (id < *count)
return;
new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *),
KM_SLEEP);
for (i = 0; i < *count; i++)
new_configs[i] = (*configs)[i];
if (*configs != NULL)
kmem_free(*configs, *count * sizeof(void *));
*configs = new_configs;
*count = id + 1;
}
static void
process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg,
const char *name, uint64_t* known_pool_guid)
{
nvlist_t *vdev_tree;
uint64_t pool_guid;
uint64_t vdev_guid, known_guid;
uint64_t id, txg, known_txg;
char *pname;
int i;
if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 ||
strcmp(pname, name) != 0)
goto ignore;
if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
goto ignore;
if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0)
goto ignore;
if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0)
goto ignore;
if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0)
goto ignore;
VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
if (*known_pool_guid != 0) {
if (pool_guid != *known_pool_guid)
goto ignore;
} else
*known_pool_guid = pool_guid;
resize_configs(configs, count, id);
if ((*configs)[id] != NULL) {
VERIFY(nvlist_lookup_uint64((*configs)[id],
ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0);
if (txg <= known_txg)
goto ignore;
nvlist_free((*configs)[id]);
}
(*configs)[id] = cfg;
return;
ignore:
nvlist_free(cfg);
}
static int
vdev_geom_attach_taster(struct g_consumer *cp, struct g_provider *pp)
{
int error;
if (pp->flags & G_PF_WITHER)
return (EINVAL);
if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize))
return (EINVAL);
g_attach(cp, pp);
error = g_access(cp, 1, 0, 0);
if (error != 0)
g_detach(cp);
return (error);
}
static void
vdev_geom_detach_taster(struct g_consumer *cp)
{
g_access(cp, -1, 0, 0);
g_detach(cp);
}
int
vdev_geom_read_pool_label(const char *name,
nvlist_t ***configs, uint64_t *count)
{
struct g_class *mp;
struct g_geom *gp, *zgp;
struct g_provider *pp;
struct g_consumer *zcp;
nvlist_t *vdev_cfg;
uint64_t pool_guid;
int error;
DROP_GIANT();
g_topology_lock();
zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
/* This orphan function should be never called. */
zgp->orphan = vdev_geom_taste_orphan;
zcp = g_new_consumer(zgp);
*configs = NULL;
*count = 0;
pool_guid = 0;
LIST_FOREACH(mp, &g_classes, class) {
if (mp == &zfs_vdev_class)
continue;
LIST_FOREACH(gp, &mp->geom, geom) {
if (gp->flags & G_GEOM_WITHER)
continue;
LIST_FOREACH(pp, &gp->provider, provider) {
if (pp->flags & G_PF_WITHER)
continue;
if (vdev_geom_attach_taster(zcp, pp) != 0)
continue;
g_topology_unlock();
error = vdev_geom_read_config(zcp, &vdev_cfg);
g_topology_lock();
vdev_geom_detach_taster(zcp);
if (error)
continue;
ZFS_LOG(1, "successfully read vdev config");
process_vdev_config(configs, count,
vdev_cfg, name, &pool_guid);
}
}
}
g_destroy_consumer(zcp);
g_destroy_geom(zgp);
g_topology_unlock();
PICKUP_GIANT();
return (*count > 0 ? 0 : ENOENT);
}
static uint64_t
vdev_geom_read_guid(struct g_consumer *cp)
{
nvlist_t *config;
uint64_t guid;
g_topology_assert_not();
guid = 0;
if (vdev_geom_read_config(cp, &config) == 0) {
guid = nvlist_get_guid(config);
nvlist_free(config);
}
return (guid);
}
static struct g_consumer *
vdev_geom_attach_by_guid(uint64_t guid)
{
struct g_class *mp;
struct g_geom *gp, *zgp;
struct g_provider *pp;
struct g_consumer *cp, *zcp;
uint64_t pguid;
g_topology_assert();
zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
/* This orphan function should be never called. */
zgp->orphan = vdev_geom_taste_orphan;
zcp = g_new_consumer(zgp);
cp = NULL;
LIST_FOREACH(mp, &g_classes, class) {
if (mp == &zfs_vdev_class)
continue;
LIST_FOREACH(gp, &mp->geom, geom) {
if (gp->flags & G_GEOM_WITHER)
continue;
LIST_FOREACH(pp, &gp->provider, provider) {
if (vdev_geom_attach_taster(zcp, pp) != 0)
continue;
g_topology_unlock();
pguid = vdev_geom_read_guid(zcp);
g_topology_lock();
vdev_geom_detach_taster(zcp);
if (pguid != guid)
continue;
cp = vdev_geom_attach(pp);
if (cp == NULL) {
printf("ZFS WARNING: Unable to attach to %s.\n",
pp->name);
continue;
}
break;
}
if (cp != NULL)
break;
}
if (cp != NULL)
break;
}
end:
g_destroy_consumer(zcp);
g_destroy_geom(zgp);
return (cp);
}
static struct g_consumer *
vdev_geom_open_by_guid(vdev_t *vd)
{
struct g_consumer *cp;
char *buf;
size_t len;
g_topology_assert();
ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
cp = vdev_geom_attach_by_guid(vd->vdev_guid);
if (cp != NULL) {
len = strlen(cp->provider->name) + strlen("/dev/") + 1;
buf = kmem_alloc(len, KM_SLEEP);
snprintf(buf, len, "/dev/%s", cp->provider->name);
spa_strfree(vd->vdev_path);
vd->vdev_path = buf;
ZFS_LOG(1, "Attach by guid [%ju] succeeded, provider %s.",
(uintmax_t)vd->vdev_guid, vd->vdev_path);
} else {
ZFS_LOG(1, "Search by guid [%ju] failed.",
(uintmax_t)vd->vdev_guid);
}
return (cp);
}
static struct g_consumer *
vdev_geom_open_by_path(vdev_t *vd, int check_guid)
{
struct g_provider *pp;
struct g_consumer *cp;
uint64_t guid;
g_topology_assert();
cp = NULL;
pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
if (pp != NULL) {
ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
cp = vdev_geom_attach(pp);
if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
pp->sectorsize <= VDEV_PAD_SIZE) {
g_topology_unlock();
guid = vdev_geom_read_guid(cp);
g_topology_lock();
if (guid != vd->vdev_guid) {
vdev_geom_detach(cp, 0);
cp = NULL;
ZFS_LOG(1, "guid mismatch for provider %s: "
"%ju != %ju.", vd->vdev_path,
(uintmax_t)vd->vdev_guid, (uintmax_t)guid);
} else {
ZFS_LOG(1, "guid match for provider %s.",
vd->vdev_path);
}
}
}
return (cp);
}
static int
vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
uint64_t *ashift)
{
struct g_provider *pp;
struct g_consumer *cp;
size_t bufsize;
int error;
/*
* We must have a pathname, and it must be absolute.
*/
if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
return (EINVAL);
}
vd->vdev_tsd = NULL;
DROP_GIANT();
g_topology_lock();
error = 0;
/*
* If we're creating or splitting a pool, just find the GEOM provider
* by its name and ignore GUID mismatches.
*/
if (vd->vdev_spa->spa_load_state == SPA_LOAD_NONE ||
vd->vdev_spa->spa_splitting_newspa == B_TRUE)
cp = vdev_geom_open_by_path(vd, 0);
else {
cp = vdev_geom_open_by_path(vd, 1);
if (cp == NULL) {
/*
* The device at vd->vdev_path doesn't have the
* expected guid. The disks might have merely
* moved around so try all other GEOM providers
* to find one with the right guid.
*/
cp = vdev_geom_open_by_guid(vd);
}
}
if (cp == NULL) {
ZFS_LOG(1, "Provider %s not found.", vd->vdev_path);
error = ENOENT;
} else if (cp->provider->sectorsize > VDEV_PAD_SIZE ||
!ISP2(cp->provider->sectorsize)) {
ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
vd->vdev_path);
vdev_geom_detach(cp, 0);
error = EINVAL;
cp = NULL;
} else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) {
int i;
for (i = 0; i < 5; i++) {
error = g_access(cp, 0, 1, 0);
if (error == 0)
break;
g_topology_unlock();
tsleep(vd, 0, "vdev", hz / 2);
g_topology_lock();
}
if (error != 0) {
printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n",
vd->vdev_path, error);
vdev_geom_detach(cp, 0);
cp = NULL;
}
}
g_topology_unlock();
PICKUP_GIANT();
if (cp == NULL) {
vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
return (error);
}
cp->private = vd;
vd->vdev_tsd = cp;
pp = cp->provider;
/*
* Determine the actual size of the device.
*/
*max_psize = *psize = pp->mediasize;
/*
* Determine the device's minimum transfer size.
*/
*ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
/*
* Clear the nowritecache settings, so that on a vdev_reopen()
* we will try again.
*/
vd->vdev_nowritecache = B_FALSE;
if (vd->vdev_physpath != NULL)
spa_strfree(vd->vdev_physpath);
bufsize = sizeof("/dev/") + strlen(pp->name);
vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
return (0);
}
static void
vdev_geom_close(vdev_t *vd)
{
struct g_consumer *cp;
cp = vd->vdev_tsd;
if (cp == NULL)
return;
vd->vdev_tsd = NULL;
vd->vdev_delayed_close = B_FALSE;
g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
}
static void
vdev_geom_io_intr(struct bio *bp)
{
vdev_t *vd;
zio_t *zio;
zio = bp->bio_caller1;
vd = zio->io_vd;
zio->io_error = bp->bio_error;
if (zio->io_error == 0 && bp->bio_resid != 0)
zio->io_error = EIO;
if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
/*
* If we get ENOTSUP, we know that no future
* attempts will ever succeed. In this case we
* set a persistent bit so that we don't bother
* with the ioctl in the future.
*/
vd->vdev_nowritecache = B_TRUE;
}
if (bp->bio_cmd == BIO_DELETE && bp->bio_error == ENOTSUP) {
/*
* If we get ENOTSUP, we know that no future
* attempts will ever succeed. In this case we
* set a persistent bit so that we don't bother
* with the ioctl in the future.
*/
vd->vdev_notrim = B_TRUE;
}
if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
/*
* If provider's error is set we assume it is being
* removed.
*/
if (bp->bio_to->error != 0) {
/*
* We post the resource as soon as possible, instead of
* when the async removal actually happens, because the
* DE is using this information to discard previous I/O
* errors.
*/
/* XXX: zfs_post_remove() can sleep. */
zfs_post_remove(zio->io_spa, vd);
vd->vdev_remove_wanted = B_TRUE;
spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
} else if (!vd->vdev_delayed_close) {
vd->vdev_delayed_close = B_TRUE;
}
}
g_destroy_bio(bp);
zio_interrupt(zio);
}
static int
vdev_geom_io_start(zio_t *zio)
{
vdev_t *vd;
struct g_consumer *cp;
struct bio *bp;
int error;
vd = zio->io_vd;
if (zio->io_type == ZIO_TYPE_IOCTL) {
/* XXPOLICY */
if (!vdev_readable(vd)) {
zio->io_error = ENXIO;
return (ZIO_PIPELINE_CONTINUE);
}
switch (zio->io_cmd) {
case DKIOCFLUSHWRITECACHE:
if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
break;
if (vd->vdev_nowritecache) {
zio->io_error = ENOTSUP;
break;
}
goto sendreq;
case DKIOCTRIM:
if (vdev_geom_bio_delete_disable)
break;
if (vd->vdev_notrim) {
zio->io_error = ENOTSUP;
break;
}
goto sendreq;
default:
zio->io_error = ENOTSUP;
}
return (ZIO_PIPELINE_CONTINUE);
}
sendreq:
cp = vd->vdev_tsd;
if (cp == NULL) {
zio->io_error = ENXIO;
return (ZIO_PIPELINE_CONTINUE);
}
bp = g_alloc_bio();
bp->bio_caller1 = zio;
switch (zio->io_type) {
case ZIO_TYPE_READ:
case ZIO_TYPE_WRITE:
bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
bp->bio_data = zio->io_data;
bp->bio_offset = zio->io_offset;
bp->bio_length = zio->io_size;
break;
case ZIO_TYPE_IOCTL:
switch (zio->io_cmd) {
case DKIOCFLUSHWRITECACHE:
bp->bio_cmd = BIO_FLUSH;
bp->bio_flags |= BIO_ORDERED;
bp->bio_data = NULL;
bp->bio_offset = cp->provider->mediasize;
bp->bio_length = 0;
break;
case DKIOCTRIM:
bp->bio_cmd = BIO_DELETE;
bp->bio_data = NULL;
bp->bio_offset = zio->io_offset;
bp->bio_length = zio->io_size;
break;
}
break;
}
bp->bio_done = vdev_geom_io_intr;
g_io_request(bp, cp);
return (ZIO_PIPELINE_STOP);
}
static void
vdev_geom_io_done(zio_t *zio)
{
}
static void
vdev_geom_hold(vdev_t *vd)
{
}
static void
vdev_geom_rele(vdev_t *vd)
{
}
vdev_ops_t vdev_geom_ops = {
vdev_geom_open,
vdev_geom_close,
vdev_default_asize,
vdev_geom_io_start,
vdev_geom_io_done,
NULL,
vdev_geom_hold,
vdev_geom_rele,
VDEV_TYPE_DISK, /* name of this vdev type */
B_TRUE /* leaf vdev */
};
|