1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
23 * All rights reserved.
24 *
25 * Portions Copyright (c) 2012 Martin Matuska <mm@FreeBSD.org>
26 */
27
28 #include <sys/zfs_context.h>
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/bio.h>
32 #include <sys/disk.h>
33 #include <sys/spa.h>
34 #include <sys/spa_impl.h>
35 #include <sys/vdev_impl.h>
36 #include <sys/fs/zfs.h>
37 #include <sys/zio.h>
38 #include <geom/geom.h>
39 #include <geom/geom_int.h>
40
41 /*
42 * Virtual device vector for GEOM.
43 */
44
45 static g_attrchanged_t vdev_geom_attrchanged;
46 struct g_class zfs_vdev_class = {
47 .name = "ZFS::VDEV",
48 .version = G_VERSION,
49 .attrchanged = vdev_geom_attrchanged,
50 };
51
52 DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
53
54 SYSCTL_DECL(_vfs_zfs_vdev);
55 /* Don't send BIO_FLUSH. */
56 static int vdev_geom_bio_flush_disable;
57 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RWTUN,
58 &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
59 /* Don't send BIO_DELETE. */
60 static int vdev_geom_bio_delete_disable;
61 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RWTUN,
62 &vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE");
63
64 static void
vdev_geom_set_rotation_rate(vdev_t * vd,struct g_consumer * cp)65 vdev_geom_set_rotation_rate(vdev_t *vd, struct g_consumer *cp)
66 {
67 int error;
68 uint16_t rate;
69
70 error = g_getattr("GEOM::rotation_rate", cp, &rate);
71 if (error == 0)
72 vd->vdev_rotation_rate = rate;
73 else
74 vd->vdev_rotation_rate = VDEV_RATE_UNKNOWN;
75 }
76
77 static void
vdev_geom_attrchanged(struct g_consumer * cp,const char * attr)78 vdev_geom_attrchanged(struct g_consumer *cp, const char *attr)
79 {
80 vdev_t *vd;
81
82 vd = cp->private;
83 if (vd == NULL)
84 return;
85
86 if (strcmp(attr, "GEOM::rotation_rate") == 0) {
87 vdev_geom_set_rotation_rate(vd, cp);
88 return;
89 }
90 }
91
92 static void
vdev_geom_orphan(struct g_consumer * cp)93 vdev_geom_orphan(struct g_consumer *cp)
94 {
95 vdev_t *vd;
96
97 g_topology_assert();
98
99 vd = cp->private;
100 if (vd == NULL)
101 return;
102
103 /*
104 * Orphan callbacks occur from the GEOM event thread.
105 * Concurrent with this call, new I/O requests may be
106 * working their way through GEOM about to find out
107 * (only once executed by the g_down thread) that we've
108 * been orphaned from our disk provider. These I/Os
109 * must be retired before we can detach our consumer.
110 * This is most easily achieved by acquiring the
111 * SPA ZIO configuration lock as a writer, but doing
112 * so with the GEOM topology lock held would cause
113 * a lock order reversal. Instead, rely on the SPA's
114 * async removal support to invoke a close on this
115 * vdev once it is safe to do so.
116 */
117 zfs_post_remove(vd->vdev_spa, vd);
118 vd->vdev_remove_wanted = B_TRUE;
119 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
120 }
121
122 static struct g_consumer *
vdev_geom_attach(struct g_provider * pp)123 vdev_geom_attach(struct g_provider *pp)
124 {
125 struct g_geom *gp;
126 struct g_consumer *cp;
127
128 g_topology_assert();
129
130 ZFS_LOG(1, "Attaching to %s.", pp->name);
131 /* Do we have geom already? No? Create one. */
132 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
133 if (gp->flags & G_GEOM_WITHER)
134 continue;
135 if (strcmp(gp->name, "zfs::vdev") != 0)
136 continue;
137 break;
138 }
139 if (gp == NULL) {
140 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
141 gp->orphan = vdev_geom_orphan;
142 cp = g_new_consumer(gp);
143 if (g_attach(cp, pp) != 0) {
144 g_wither_geom(gp, ENXIO);
145 return (NULL);
146 }
147 if (g_access(cp, 1, 0, 1) != 0) {
148 g_wither_geom(gp, ENXIO);
149 return (NULL);
150 }
151 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
152 } else {
153 /* Check if we are already connected to this provider. */
154 LIST_FOREACH(cp, &gp->consumer, consumer) {
155 if (cp->provider == pp) {
156 ZFS_LOG(1, "Found consumer for %s.", pp->name);
157 break;
158 }
159 }
160 if (cp == NULL) {
161 cp = g_new_consumer(gp);
162 if (g_attach(cp, pp) != 0) {
163 g_destroy_consumer(cp);
164 return (NULL);
165 }
166 if (g_access(cp, 1, 0, 1) != 0) {
167 g_detach(cp);
168 g_destroy_consumer(cp);
169 return (NULL);
170 }
171 ZFS_LOG(1, "Created consumer for %s.", pp->name);
172 } else {
173 if (g_access(cp, 1, 0, 1) != 0)
174 return (NULL);
175 ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
176 }
177 }
178 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
179 return (cp);
180 }
181
182 static void
vdev_geom_detach(void * arg,int flag __unused)183 vdev_geom_detach(void *arg, int flag __unused)
184 {
185 struct g_geom *gp;
186 struct g_consumer *cp;
187
188 g_topology_assert();
189 cp = arg;
190 gp = cp->geom;
191
192 ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
193 g_access(cp, -1, 0, -1);
194 /* Destroy consumer on last close. */
195 if (cp->acr == 0 && cp->ace == 0) {
196 ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
197 if (cp->acw > 0)
198 g_access(cp, 0, -cp->acw, 0);
199 g_detach(cp);
200 g_destroy_consumer(cp);
201 }
202 /* Destroy geom if there are no consumers left. */
203 if (LIST_EMPTY(&gp->consumer)) {
204 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
205 g_wither_geom(gp, ENXIO);
206 }
207 }
208
209 static void
nvlist_get_guids(nvlist_t * list,uint64_t * pguid,uint64_t * vguid)210 nvlist_get_guids(nvlist_t *list, uint64_t *pguid, uint64_t *vguid)
211 {
212
213 nvlist_lookup_uint64(list, ZPOOL_CONFIG_GUID, vguid);
214 nvlist_lookup_uint64(list, ZPOOL_CONFIG_POOL_GUID, pguid);
215 }
216
217 static int
vdev_geom_io(struct g_consumer * cp,int cmd,void * data,off_t offset,off_t size)218 vdev_geom_io(struct g_consumer *cp, int cmd, void *data, off_t offset, off_t size)
219 {
220 struct bio *bp;
221 u_char *p;
222 off_t off, maxio;
223 int error;
224
225 ASSERT((offset % cp->provider->sectorsize) == 0);
226 ASSERT((size % cp->provider->sectorsize) == 0);
227
228 bp = g_alloc_bio();
229 off = offset;
230 offset += size;
231 p = data;
232 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
233 error = 0;
234
235 for (; off < offset; off += maxio, p += maxio, size -= maxio) {
236 bzero(bp, sizeof(*bp));
237 bp->bio_cmd = cmd;
238 bp->bio_done = NULL;
239 bp->bio_offset = off;
240 bp->bio_length = MIN(size, maxio);
241 bp->bio_data = p;
242 g_io_request(bp, cp);
243 error = biowait(bp, "vdev_geom_io");
244 if (error != 0)
245 break;
246 }
247
248 g_destroy_bio(bp);
249 return (error);
250 }
251
252 static void
vdev_geom_taste_orphan(struct g_consumer * cp)253 vdev_geom_taste_orphan(struct g_consumer *cp)
254 {
255
256 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
257 cp->provider->name));
258 }
259
260 static int
vdev_geom_read_config(struct g_consumer * cp,nvlist_t ** config)261 vdev_geom_read_config(struct g_consumer *cp, nvlist_t **config)
262 {
263 struct g_provider *pp;
264 vdev_label_t *label;
265 char *p, *buf;
266 size_t buflen;
267 uint64_t psize;
268 off_t offset, size;
269 uint64_t state, txg;
270 int error, l, len;
271
272 g_topology_assert_not();
273
274 pp = cp->provider;
275 ZFS_LOG(1, "Reading config from %s...", pp->name);
276
277 psize = pp->mediasize;
278 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
279
280 size = sizeof(*label) + pp->sectorsize -
281 ((sizeof(*label) - 1) % pp->sectorsize) - 1;
282
283 label = kmem_alloc(size, KM_SLEEP);
284 buflen = sizeof(label->vl_vdev_phys.vp_nvlist);
285
286 *config = NULL;
287 for (l = 0; l < VDEV_LABELS; l++) {
288
289 offset = vdev_label_offset(psize, l, 0);
290 if ((offset % pp->sectorsize) != 0)
291 continue;
292
293 if (vdev_geom_io(cp, BIO_READ, label, offset, size) != 0)
294 continue;
295 buf = label->vl_vdev_phys.vp_nvlist;
296
297 if (nvlist_unpack(buf, buflen, config, 0) != 0)
298 continue;
299
300 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
301 &state) != 0 || state > POOL_STATE_L2CACHE) {
302 nvlist_free(*config);
303 *config = NULL;
304 continue;
305 }
306
307 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE &&
308 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
309 &txg) != 0 || txg == 0)) {
310 nvlist_free(*config);
311 *config = NULL;
312 continue;
313 }
314
315 break;
316 }
317
318 kmem_free(label, size);
319 return (*config == NULL ? ENOENT : 0);
320 }
321
322 static void
resize_configs(nvlist_t *** configs,uint64_t * count,uint64_t id)323 resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id)
324 {
325 nvlist_t **new_configs;
326 uint64_t i;
327
328 if (id < *count)
329 return;
330 new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *),
331 KM_SLEEP);
332 for (i = 0; i < *count; i++)
333 new_configs[i] = (*configs)[i];
334 if (*configs != NULL)
335 kmem_free(*configs, *count * sizeof(void *));
336 *configs = new_configs;
337 *count = id + 1;
338 }
339
340 static void
process_vdev_config(nvlist_t *** configs,uint64_t * count,nvlist_t * cfg,const char * name,uint64_t * known_pool_guid)341 process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg,
342 const char *name, uint64_t* known_pool_guid)
343 {
344 nvlist_t *vdev_tree;
345 uint64_t pool_guid;
346 uint64_t vdev_guid, known_guid;
347 uint64_t id, txg, known_txg;
348 char *pname;
349 int i;
350
351 if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 ||
352 strcmp(pname, name) != 0)
353 goto ignore;
354
355 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
356 goto ignore;
357
358 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0)
359 goto ignore;
360
361 if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0)
362 goto ignore;
363
364 if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0)
365 goto ignore;
366
367 VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
368
369 if (*known_pool_guid != 0) {
370 if (pool_guid != *known_pool_guid)
371 goto ignore;
372 } else
373 *known_pool_guid = pool_guid;
374
375 resize_configs(configs, count, id);
376
377 if ((*configs)[id] != NULL) {
378 VERIFY(nvlist_lookup_uint64((*configs)[id],
379 ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0);
380 if (txg <= known_txg)
381 goto ignore;
382 nvlist_free((*configs)[id]);
383 }
384
385 (*configs)[id] = cfg;
386 return;
387
388 ignore:
389 nvlist_free(cfg);
390 }
391
392 static int
vdev_geom_attach_taster(struct g_consumer * cp,struct g_provider * pp)393 vdev_geom_attach_taster(struct g_consumer *cp, struct g_provider *pp)
394 {
395 int error;
396
397 if (pp->flags & G_PF_WITHER)
398 return (EINVAL);
399 g_attach(cp, pp);
400 error = g_access(cp, 1, 0, 0);
401 if (error == 0) {
402 if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize))
403 error = EINVAL;
404 else if (pp->mediasize < SPA_MINDEVSIZE)
405 error = EINVAL;
406 if (error != 0)
407 g_access(cp, -1, 0, 0);
408 }
409 if (error != 0)
410 g_detach(cp);
411 return (error);
412 }
413
414 static void
vdev_geom_detach_taster(struct g_consumer * cp)415 vdev_geom_detach_taster(struct g_consumer *cp)
416 {
417 g_access(cp, -1, 0, 0);
418 g_detach(cp);
419 }
420
421 int
vdev_geom_read_pool_label(const char * name,nvlist_t *** configs,uint64_t * count)422 vdev_geom_read_pool_label(const char *name,
423 nvlist_t ***configs, uint64_t *count)
424 {
425 struct g_class *mp;
426 struct g_geom *gp, *zgp;
427 struct g_provider *pp;
428 struct g_consumer *zcp;
429 nvlist_t *vdev_cfg;
430 uint64_t pool_guid;
431 int error;
432
433 DROP_GIANT();
434 g_topology_lock();
435
436 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
437 /* This orphan function should be never called. */
438 zgp->orphan = vdev_geom_taste_orphan;
439 zcp = g_new_consumer(zgp);
440
441 *configs = NULL;
442 *count = 0;
443 pool_guid = 0;
444 LIST_FOREACH(mp, &g_classes, class) {
445 if (mp == &zfs_vdev_class)
446 continue;
447 LIST_FOREACH(gp, &mp->geom, geom) {
448 if (gp->flags & G_GEOM_WITHER)
449 continue;
450 LIST_FOREACH(pp, &gp->provider, provider) {
451 if (pp->flags & G_PF_WITHER)
452 continue;
453 if (vdev_geom_attach_taster(zcp, pp) != 0)
454 continue;
455 g_topology_unlock();
456 error = vdev_geom_read_config(zcp, &vdev_cfg);
457 g_topology_lock();
458 vdev_geom_detach_taster(zcp);
459 if (error)
460 continue;
461 ZFS_LOG(1, "successfully read vdev config");
462
463 process_vdev_config(configs, count,
464 vdev_cfg, name, &pool_guid);
465 }
466 }
467 }
468
469 g_destroy_consumer(zcp);
470 g_destroy_geom(zgp);
471 g_topology_unlock();
472 PICKUP_GIANT();
473
474 return (*count > 0 ? 0 : ENOENT);
475 }
476
477 static void
vdev_geom_read_guids(struct g_consumer * cp,uint64_t * pguid,uint64_t * vguid)478 vdev_geom_read_guids(struct g_consumer *cp, uint64_t *pguid, uint64_t *vguid)
479 {
480 nvlist_t *config;
481
482 g_topology_assert_not();
483
484 *pguid = 0;
485 *vguid = 0;
486 if (vdev_geom_read_config(cp, &config) == 0) {
487 nvlist_get_guids(config, pguid, vguid);
488 nvlist_free(config);
489 }
490 }
491
492 static struct g_consumer *
vdev_geom_attach_by_guids(uint64_t pool_guid,uint64_t vdev_guid)493 vdev_geom_attach_by_guids(uint64_t pool_guid, uint64_t vdev_guid)
494 {
495 struct g_class *mp;
496 struct g_geom *gp, *zgp;
497 struct g_provider *pp;
498 struct g_consumer *cp, *zcp;
499 uint64_t pguid, vguid;
500
501 g_topology_assert();
502
503 zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
504 /* This orphan function should be never called. */
505 zgp->orphan = vdev_geom_taste_orphan;
506 zcp = g_new_consumer(zgp);
507
508 cp = NULL;
509 LIST_FOREACH(mp, &g_classes, class) {
510 if (mp == &zfs_vdev_class)
511 continue;
512 LIST_FOREACH(gp, &mp->geom, geom) {
513 if (gp->flags & G_GEOM_WITHER)
514 continue;
515 LIST_FOREACH(pp, &gp->provider, provider) {
516 if (vdev_geom_attach_taster(zcp, pp) != 0)
517 continue;
518 g_topology_unlock();
519 vdev_geom_read_guids(zcp, &pguid, &vguid);
520 g_topology_lock();
521 vdev_geom_detach_taster(zcp);
522 if (pguid != pool_guid || vguid != vdev_guid)
523 continue;
524 cp = vdev_geom_attach(pp);
525 if (cp == NULL) {
526 printf("ZFS WARNING: Unable to "
527 "attach to %s.\n", pp->name);
528 continue;
529 }
530 break;
531 }
532 if (cp != NULL)
533 break;
534 }
535 if (cp != NULL)
536 break;
537 }
538 end:
539 g_destroy_consumer(zcp);
540 g_destroy_geom(zgp);
541 return (cp);
542 }
543
544 static struct g_consumer *
vdev_geom_open_by_guids(vdev_t * vd)545 vdev_geom_open_by_guids(vdev_t *vd)
546 {
547 struct g_consumer *cp;
548 char *buf;
549 size_t len;
550
551 g_topology_assert();
552
553 ZFS_LOG(1, "Searching by guid [%ju].", (uintmax_t)vd->vdev_guid);
554 cp = vdev_geom_attach_by_guids(spa_guid(vd->vdev_spa), vd->vdev_guid);
555 if (cp != NULL) {
556 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
557 buf = kmem_alloc(len, KM_SLEEP);
558
559 snprintf(buf, len, "/dev/%s", cp->provider->name);
560 spa_strfree(vd->vdev_path);
561 vd->vdev_path = buf;
562
563 ZFS_LOG(1, "Attach by guid [%ju:%ju] succeeded, provider %s.",
564 (uintmax_t)spa_guid(vd->vdev_spa),
565 (uintmax_t)vd->vdev_guid, vd->vdev_path);
566 } else {
567 ZFS_LOG(1, "Search by guid [%ju:%ju] failed.",
568 (uintmax_t)spa_guid(vd->vdev_spa),
569 (uintmax_t)vd->vdev_guid);
570 }
571
572 return (cp);
573 }
574
575 static struct g_consumer *
vdev_geom_open_by_path(vdev_t * vd,int check_guid)576 vdev_geom_open_by_path(vdev_t *vd, int check_guid)
577 {
578 struct g_provider *pp;
579 struct g_consumer *cp;
580 uint64_t pguid, vguid;
581
582 g_topology_assert();
583
584 cp = NULL;
585 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
586 if (pp != NULL) {
587 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
588 cp = vdev_geom_attach(pp);
589 if (cp != NULL && check_guid && ISP2(pp->sectorsize) &&
590 pp->sectorsize <= VDEV_PAD_SIZE) {
591 g_topology_unlock();
592 vdev_geom_read_guids(cp, &pguid, &vguid);
593 g_topology_lock();
594 if (pguid != spa_guid(vd->vdev_spa) ||
595 vguid != vd->vdev_guid) {
596 vdev_geom_detach(cp, 0);
597 cp = NULL;
598 ZFS_LOG(1, "guid mismatch for provider %s: "
599 "%ju:%ju != %ju:%ju.", vd->vdev_path,
600 (uintmax_t)spa_guid(vd->vdev_spa),
601 (uintmax_t)vd->vdev_guid,
602 (uintmax_t)pguid, (uintmax_t)vguid);
603 } else {
604 ZFS_LOG(1, "guid match for provider %s.",
605 vd->vdev_path);
606 }
607 }
608 }
609
610 return (cp);
611 }
612
613 static int
vdev_geom_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * logical_ashift,uint64_t * physical_ashift)614 vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
615 uint64_t *logical_ashift, uint64_t *physical_ashift)
616 {
617 struct g_provider *pp;
618 struct g_consumer *cp;
619 size_t bufsize;
620 int error;
621
622 /*
623 * We must have a pathname, and it must be absolute.
624 */
625 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
626 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
627 return (EINVAL);
628 }
629
630 vd->vdev_tsd = NULL;
631
632 DROP_GIANT();
633 g_topology_lock();
634 error = 0;
635
636 if (vd->vdev_spa->spa_splitting_newspa ||
637 (vd->vdev_prevstate == VDEV_STATE_UNKNOWN &&
638 vd->vdev_spa->spa_load_state == SPA_LOAD_NONE)) {
639 /*
640 * We are dealing with a vdev that hasn't been previously
641 * opened (since boot), and we are not loading an
642 * existing pool configuration. This looks like a
643 * vdev add operation to a new or existing pool.
644 * Assume the user knows what he/she is doing and find
645 * GEOM provider by its name, ignoring GUID mismatches.
646 *
647 * XXPOLICY: It would be safer to only allow a device
648 * that is unlabeled or labeled but missing
649 * GUID information to be opened in this fashion,
650 * unless we are doing a split, in which case we
651 * should allow any guid.
652 */
653 cp = vdev_geom_open_by_path(vd, 0);
654 } else {
655 /*
656 * Try using the recorded path for this device, but only
657 * accept it if its label data contains the expected GUIDs.
658 */
659 cp = vdev_geom_open_by_path(vd, 1);
660 if (cp == NULL) {
661 /*
662 * The device at vd->vdev_path doesn't have the
663 * expected GUIDs. The disks might have merely
664 * moved around so try all other GEOM providers
665 * to find one with the right GUIDs.
666 */
667 cp = vdev_geom_open_by_guids(vd);
668 }
669 }
670
671 if (cp == NULL) {
672 ZFS_LOG(1, "Provider %s not found.", vd->vdev_path);
673 error = ENOENT;
674 } else if (cp->provider->sectorsize > VDEV_PAD_SIZE ||
675 !ISP2(cp->provider->sectorsize)) {
676 ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
677 vd->vdev_path);
678 vdev_geom_detach(cp, 0);
679 error = EINVAL;
680 cp = NULL;
681 } else if (cp->acw == 0 && (spa_mode(vd->vdev_spa) & FWRITE) != 0) {
682 int i;
683
684 for (i = 0; i < 5; i++) {
685 error = g_access(cp, 0, 1, 0);
686 if (error == 0)
687 break;
688 g_topology_unlock();
689 tsleep(vd, 0, "vdev", hz / 2);
690 g_topology_lock();
691 }
692 if (error != 0) {
693 printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n",
694 vd->vdev_path, error);
695 vdev_geom_detach(cp, 0);
696 cp = NULL;
697 }
698 }
699 g_topology_unlock();
700 PICKUP_GIANT();
701 if (cp == NULL) {
702 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
703 return (error);
704 }
705
706 cp->private = vd;
707 vd->vdev_tsd = cp;
708 pp = cp->provider;
709
710 /*
711 * Determine the actual size of the device.
712 */
713 *max_psize = *psize = pp->mediasize;
714
715 /*
716 * Determine the device's minimum transfer size and preferred
717 * transfer size.
718 */
719 *logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
720 *physical_ashift = 0;
721 if (pp->stripesize)
722 *physical_ashift = highbit(pp->stripesize) - 1;
723
724 /*
725 * Clear the nowritecache settings, so that on a vdev_reopen()
726 * we will try again.
727 */
728 vd->vdev_nowritecache = B_FALSE;
729
730 if (vd->vdev_physpath != NULL)
731 spa_strfree(vd->vdev_physpath);
732 bufsize = sizeof("/dev/") + strlen(pp->name);
733 vd->vdev_physpath = kmem_alloc(bufsize, KM_SLEEP);
734 snprintf(vd->vdev_physpath, bufsize, "/dev/%s", pp->name);
735
736 /*
737 * Determine the device's rotation rate.
738 */
739 vdev_geom_set_rotation_rate(vd, cp);
740
741 return (0);
742 }
743
744 static void
vdev_geom_close(vdev_t * vd)745 vdev_geom_close(vdev_t *vd)
746 {
747 struct g_consumer *cp;
748
749 cp = vd->vdev_tsd;
750 if (cp == NULL)
751 return;
752 vd->vdev_tsd = NULL;
753 vd->vdev_delayed_close = B_FALSE;
754 cp->private = NULL; /* XXX locking */
755 g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
756 }
757
758 static void
vdev_geom_io_intr(struct bio * bp)759 vdev_geom_io_intr(struct bio *bp)
760 {
761 vdev_t *vd;
762 zio_t *zio;
763
764 zio = bp->bio_caller1;
765 vd = zio->io_vd;
766 zio->io_error = bp->bio_error;
767 if (zio->io_error == 0 && bp->bio_resid != 0)
768 zio->io_error = SET_ERROR(EIO);
769
770 switch(zio->io_error) {
771 case ENOTSUP:
772 /*
773 * If we get ENOTSUP for BIO_FLUSH or BIO_DELETE we know
774 * that future attempts will never succeed. In this case
775 * we set a persistent flag so that we don't bother with
776 * requests in the future.
777 */
778 switch(bp->bio_cmd) {
779 case BIO_FLUSH:
780 vd->vdev_nowritecache = B_TRUE;
781 break;
782 case BIO_DELETE:
783 vd->vdev_notrim = B_TRUE;
784 break;
785 }
786 break;
787 case ENXIO:
788 if (!vd->vdev_remove_wanted) {
789 /*
790 * If provider's error is set we assume it is being
791 * removed.
792 */
793 if (bp->bio_to->error != 0) {
794 vd->vdev_remove_wanted = B_TRUE;
795 spa_async_request(zio->io_spa,
796 SPA_ASYNC_REMOVE);
797 } else if (!vd->vdev_delayed_close) {
798 vd->vdev_delayed_close = B_TRUE;
799 }
800 }
801 break;
802 }
803 g_destroy_bio(bp);
804 zio_interrupt(zio);
805 }
806
807 static void
vdev_geom_io_start(zio_t * zio)808 vdev_geom_io_start(zio_t *zio)
809 {
810 vdev_t *vd;
811 struct g_consumer *cp;
812 struct bio *bp;
813 int error;
814
815 vd = zio->io_vd;
816
817 switch (zio->io_type) {
818 case ZIO_TYPE_IOCTL:
819 /* XXPOLICY */
820 if (!vdev_readable(vd)) {
821 zio->io_error = SET_ERROR(ENXIO);
822 zio_interrupt(zio);
823 return;
824 } else {
825 switch (zio->io_cmd) {
826 case DKIOCFLUSHWRITECACHE:
827 if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
828 break;
829 if (vd->vdev_nowritecache) {
830 zio->io_error = SET_ERROR(ENOTSUP);
831 break;
832 }
833 goto sendreq;
834 default:
835 zio->io_error = SET_ERROR(ENOTSUP);
836 }
837 }
838
839 zio_execute(zio);
840 return;
841 case ZIO_TYPE_FREE:
842 if (vd->vdev_notrim) {
843 zio->io_error = SET_ERROR(ENOTSUP);
844 } else if (!vdev_geom_bio_delete_disable) {
845 goto sendreq;
846 }
847 zio_execute(zio);
848 return;
849 }
850 sendreq:
851 ASSERT(zio->io_type == ZIO_TYPE_READ ||
852 zio->io_type == ZIO_TYPE_WRITE ||
853 zio->io_type == ZIO_TYPE_FREE ||
854 zio->io_type == ZIO_TYPE_IOCTL);
855
856 cp = vd->vdev_tsd;
857 if (cp == NULL) {
858 zio->io_error = SET_ERROR(ENXIO);
859 zio_interrupt(zio);
860 return;
861 }
862 bp = g_alloc_bio();
863 bp->bio_caller1 = zio;
864 switch (zio->io_type) {
865 case ZIO_TYPE_READ:
866 case ZIO_TYPE_WRITE:
867 bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
868 bp->bio_data = zio->io_data;
869 bp->bio_offset = zio->io_offset;
870 bp->bio_length = zio->io_size;
871 break;
872 case ZIO_TYPE_FREE:
873 bp->bio_cmd = BIO_DELETE;
874 bp->bio_data = NULL;
875 bp->bio_offset = zio->io_offset;
876 bp->bio_length = zio->io_size;
877 break;
878 case ZIO_TYPE_IOCTL:
879 bp->bio_cmd = BIO_FLUSH;
880 bp->bio_flags |= BIO_ORDERED;
881 bp->bio_data = NULL;
882 bp->bio_offset = cp->provider->mediasize;
883 bp->bio_length = 0;
884 break;
885 }
886 bp->bio_done = vdev_geom_io_intr;
887
888 g_io_request(bp, cp);
889 }
890
891 static void
vdev_geom_io_done(zio_t * zio)892 vdev_geom_io_done(zio_t *zio)
893 {
894 }
895
896 static void
vdev_geom_hold(vdev_t * vd)897 vdev_geom_hold(vdev_t *vd)
898 {
899 }
900
901 static void
vdev_geom_rele(vdev_t * vd)902 vdev_geom_rele(vdev_t *vd)
903 {
904 }
905
906 vdev_ops_t vdev_geom_ops = {
907 vdev_geom_open,
908 vdev_geom_close,
909 vdev_default_asize,
910 vdev_geom_io_start,
911 vdev_geom_io_done,
912 NULL,
913 vdev_geom_hold,
914 vdev_geom_rele,
915 VDEV_TYPE_DISK, /* name of this vdev type */
916 B_TRUE /* leaf vdev */
917 };
918