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 <[email protected]>
23 * All rights reserved.
24 *
25 * Portions Copyright (c) 2012 Martin Matuska <[email protected]>
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 struct consumer_vdev_elem {
53 SLIST_ENTRY(consumer_vdev_elem) elems;
54 vdev_t *vd;
55 };
56
57 SLIST_HEAD(consumer_priv_t, consumer_vdev_elem);
58 _Static_assert(sizeof(((struct g_consumer*)NULL)->private)
59 == sizeof(struct consumer_priv_t*),
60 "consumer_priv_t* can't be stored in g_consumer.private");
61
62 DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
63
64 SYSCTL_DECL(_vfs_zfs_vdev);
65 /* Don't send BIO_FLUSH. */
66 static int vdev_geom_bio_flush_disable;
67 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_flush_disable, CTLFLAG_RWTUN,
68 &vdev_geom_bio_flush_disable, 0, "Disable BIO_FLUSH");
69 /* Don't send BIO_DELETE. */
70 static int vdev_geom_bio_delete_disable;
71 SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, bio_delete_disable, CTLFLAG_RWTUN,
72 &vdev_geom_bio_delete_disable, 0, "Disable BIO_DELETE");
73
74 /* Declare local functions */
75 static void vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read);
76
77 /*
78 * Thread local storage used to indicate when a thread is probing geoms
79 * for their guids. If NULL, this thread is not tasting geoms. If non NULL,
80 * it is looking for a replacement for the vdev_t* that is its value.
81 */
82 uint_t zfs_geom_probe_vdev_key;
83
84 static void
vdev_geom_set_rotation_rate(vdev_t * vd,struct g_consumer * cp)85 vdev_geom_set_rotation_rate(vdev_t *vd, struct g_consumer *cp)
86 {
87 int error;
88 uint16_t rate;
89
90 error = g_getattr("GEOM::rotation_rate", cp, &rate);
91 if (error == 0 && rate == 1)
92 vd->vdev_nonrot = B_TRUE;
93 else
94 vd->vdev_nonrot = B_FALSE;
95 }
96
97 static void
vdev_geom_set_physpath(vdev_t * vd,struct g_consumer * cp,boolean_t do_null_update)98 vdev_geom_set_physpath(vdev_t *vd, struct g_consumer *cp,
99 boolean_t do_null_update)
100 {
101 boolean_t needs_update = B_FALSE;
102 char *physpath;
103 int error, physpath_len;
104
105 physpath_len = MAXPATHLEN;
106 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
107 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
108 if (error == 0) {
109 char *old_physpath;
110
111 /* g_topology lock ensures that vdev has not been closed */
112 g_topology_assert();
113 old_physpath = vd->vdev_physpath;
114 vd->vdev_physpath = spa_strdup(physpath);
115
116 if (old_physpath != NULL) {
117 needs_update = (strcmp(old_physpath,
118 vd->vdev_physpath) != 0);
119 spa_strfree(old_physpath);
120 } else
121 needs_update = do_null_update;
122 }
123 g_free(physpath);
124
125 /*
126 * If the physical path changed, update the config.
127 * Only request an update for previously unset physpaths if
128 * requested by the caller.
129 */
130 if (needs_update)
131 spa_async_request(vd->vdev_spa, SPA_ASYNC_CONFIG_UPDATE);
132
133 }
134
135 static void
vdev_geom_attrchanged(struct g_consumer * cp,const char * attr)136 vdev_geom_attrchanged(struct g_consumer *cp, const char *attr)
137 {
138 char *old_physpath;
139 struct consumer_priv_t *priv;
140 struct consumer_vdev_elem *elem;
141 int error;
142
143 priv = (struct consumer_priv_t*)&cp->private;
144 if (SLIST_EMPTY(priv))
145 return;
146
147 SLIST_FOREACH(elem, priv, elems) {
148 vdev_t *vd = elem->vd;
149 if (strcmp(attr, "GEOM::rotation_rate") == 0) {
150 vdev_geom_set_rotation_rate(vd, cp);
151 return;
152 }
153 if (strcmp(attr, "GEOM::physpath") == 0) {
154 vdev_geom_set_physpath(vd, cp, /*null_update*/B_TRUE);
155 return;
156 }
157 }
158 }
159
160 static void
vdev_geom_resize(struct g_consumer * cp)161 vdev_geom_resize(struct g_consumer *cp)
162 {
163 struct consumer_priv_t *priv;
164 struct consumer_vdev_elem *elem;
165 spa_t *spa;
166 vdev_t *vd;
167
168 priv = (struct consumer_priv_t *)&cp->private;
169 if (SLIST_EMPTY(priv))
170 return;
171
172 SLIST_FOREACH(elem, priv, elems) {
173 vd = elem->vd;
174 if (vd->vdev_state != VDEV_STATE_HEALTHY)
175 continue;
176 spa = vd->vdev_spa;
177 if (!spa->spa_autoexpand)
178 continue;
179 vdev_online(spa, vd->vdev_guid, ZFS_ONLINE_EXPAND, NULL);
180 }
181 }
182
183 static void
vdev_geom_orphan(struct g_consumer * cp)184 vdev_geom_orphan(struct g_consumer *cp)
185 {
186 struct consumer_priv_t *priv;
187 struct consumer_vdev_elem *elem;
188
189 g_topology_assert();
190
191 priv = (struct consumer_priv_t*)&cp->private;
192 if (SLIST_EMPTY(priv))
193 /* Vdev close in progress. Ignore the event. */
194 return;
195
196 /*
197 * Orphan callbacks occur from the GEOM event thread.
198 * Concurrent with this call, new I/O requests may be
199 * working their way through GEOM about to find out
200 * (only once executed by the g_down thread) that we've
201 * been orphaned from our disk provider. These I/Os
202 * must be retired before we can detach our consumer.
203 * This is most easily achieved by acquiring the
204 * SPA ZIO configuration lock as a writer, but doing
205 * so with the GEOM topology lock held would cause
206 * a lock order reversal. Instead, rely on the SPA's
207 * async removal support to invoke a close on this
208 * vdev once it is safe to do so.
209 */
210 SLIST_FOREACH(elem, priv, elems) {
211 vdev_t *vd = elem->vd;
212
213 vd->vdev_remove_wanted = B_TRUE;
214 spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE);
215 }
216 }
217
218 static struct g_consumer *
vdev_geom_attach(struct g_provider * pp,vdev_t * vd,boolean_t sanity)219 vdev_geom_attach(struct g_provider *pp, vdev_t *vd, boolean_t sanity)
220 {
221 struct g_geom *gp;
222 struct g_consumer *cp;
223 int error;
224
225 g_topology_assert();
226
227 ZFS_LOG(1, "Attaching to %s.", pp->name);
228
229 if (sanity) {
230 if (pp->sectorsize > VDEV_PAD_SIZE || !ISP2(pp->sectorsize)) {
231 ZFS_LOG(1, "Failing attach of %s. "
232 "Incompatible sectorsize %d\n",
233 pp->name, pp->sectorsize);
234 return (NULL);
235 } else if (pp->mediasize < SPA_MINDEVSIZE) {
236 ZFS_LOG(1, "Failing attach of %s. "
237 "Incompatible mediasize %ju\n",
238 pp->name, pp->mediasize);
239 return (NULL);
240 }
241 }
242
243 /* Do we have geom already? No? Create one. */
244 LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
245 if (gp->flags & G_GEOM_WITHER)
246 continue;
247 if (strcmp(gp->name, "zfs::vdev") != 0)
248 continue;
249 break;
250 }
251 if (gp == NULL) {
252 gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
253 gp->orphan = vdev_geom_orphan;
254 gp->attrchanged = vdev_geom_attrchanged;
255 gp->resize = vdev_geom_resize;
256 cp = g_new_consumer(gp);
257 error = g_attach(cp, pp);
258 if (error != 0) {
259 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n", __func__,
260 __LINE__, error);
261 vdev_geom_detach(cp, B_FALSE);
262 return (NULL);
263 }
264 error = g_access(cp, 1, 0, 1);
265 if (error != 0) {
266 ZFS_LOG(1, "%s(%d): g_access failed: %d\n", __func__,
267 __LINE__, error);
268 vdev_geom_detach(cp, B_FALSE);
269 return (NULL);
270 }
271 ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
272 } else {
273 /* Check if we are already connected to this provider. */
274 LIST_FOREACH(cp, &gp->consumer, consumer) {
275 if (cp->provider == pp) {
276 ZFS_LOG(1, "Found consumer for %s.", pp->name);
277 break;
278 }
279 }
280 if (cp == NULL) {
281 cp = g_new_consumer(gp);
282 error = g_attach(cp, pp);
283 if (error != 0) {
284 ZFS_LOG(1, "%s(%d): g_attach failed: %d\n",
285 __func__, __LINE__, error);
286 vdev_geom_detach(cp, B_FALSE);
287 return (NULL);
288 }
289 error = g_access(cp, 1, 0, 1);
290 if (error != 0) {
291 ZFS_LOG(1, "%s(%d): g_access failed: %d\n",
292 __func__, __LINE__, error);
293 vdev_geom_detach(cp, B_FALSE);
294 return (NULL);
295 }
296 ZFS_LOG(1, "Created consumer for %s.", pp->name);
297 } else {
298 error = g_access(cp, 1, 0, 1);
299 if (error != 0) {
300 ZFS_LOG(1, "%s(%d): g_access failed: %d\n",
301 __func__, __LINE__, error);
302 return (NULL);
303 }
304 ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
305 }
306 }
307
308 if (vd != NULL)
309 vd->vdev_tsd = cp;
310
311 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
312 return (cp);
313 }
314
315 static void
vdev_geom_detach(struct g_consumer * cp,boolean_t open_for_read)316 vdev_geom_detach(struct g_consumer *cp, boolean_t open_for_read)
317 {
318 struct g_geom *gp;
319
320 g_topology_assert();
321
322 ZFS_LOG(1, "Detaching from %s.",
323 cp->provider && cp->provider->name ? cp->provider->name : "NULL");
324
325 gp = cp->geom;
326 if (open_for_read)
327 g_access(cp, -1, 0, -1);
328 /* Destroy consumer on last close. */
329 if (cp->acr == 0 && cp->ace == 0) {
330 if (cp->acw > 0)
331 g_access(cp, 0, -cp->acw, 0);
332 if (cp->provider != NULL) {
333 ZFS_LOG(1, "Destroying consumer for %s.",
334 cp->provider->name ? cp->provider->name : "NULL");
335 g_detach(cp);
336 }
337 g_destroy_consumer(cp);
338 }
339 /* Destroy geom if there are no consumers left. */
340 if (LIST_EMPTY(&gp->consumer)) {
341 ZFS_LOG(1, "Destroyed geom %s.", gp->name);
342 g_wither_geom(gp, ENXIO);
343 }
344 }
345
346 static void
vdev_geom_close_locked(vdev_t * vd)347 vdev_geom_close_locked(vdev_t *vd)
348 {
349 struct g_consumer *cp;
350 struct consumer_priv_t *priv;
351 struct consumer_vdev_elem *elem, *elem_temp;
352
353 g_topology_assert();
354
355 cp = vd->vdev_tsd;
356 vd->vdev_delayed_close = B_FALSE;
357 if (cp == NULL)
358 return;
359
360 ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
361 KASSERT(cp->private != NULL, ("%s: cp->private is NULL", __func__));
362 priv = (struct consumer_priv_t*)&cp->private;
363 vd->vdev_tsd = NULL;
364 SLIST_FOREACH_SAFE(elem, priv, elems, elem_temp) {
365 if (elem->vd == vd) {
366 SLIST_REMOVE(priv, elem, consumer_vdev_elem, elems);
367 g_free(elem);
368 }
369 }
370
371 vdev_geom_detach(cp, B_TRUE);
372 }
373
374 /*
375 * Issue one or more bios to the vdev in parallel
376 * cmds, datas, offsets, errors, and sizes are arrays of length ncmds. Each IO
377 * operation is described by parallel entries from each array. There may be
378 * more bios actually issued than entries in the array
379 */
380 static void
vdev_geom_io(struct g_consumer * cp,int * cmds,void ** datas,off_t * offsets,off_t * sizes,int * errors,int ncmds)381 vdev_geom_io(struct g_consumer *cp, int *cmds, void **datas, off_t *offsets,
382 off_t *sizes, int *errors, int ncmds)
383 {
384 struct bio **bios;
385 u_char *p;
386 off_t off, maxio, s, end;
387 int i, n_bios, j;
388 size_t bios_size;
389
390 maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
391 n_bios = 0;
392
393 /* How many bios are required for all commands ? */
394 for (i = 0; i < ncmds; i++)
395 n_bios += (sizes[i] + maxio - 1) / maxio;
396
397 /* Allocate memory for the bios */
398 bios_size = n_bios * sizeof(struct bio*);
399 bios = kmem_zalloc(bios_size, KM_SLEEP);
400
401 /* Prepare and issue all of the bios */
402 for (i = j = 0; i < ncmds; i++) {
403 off = offsets[i];
404 p = datas[i];
405 s = sizes[i];
406 end = off + s;
407 ASSERT((off % cp->provider->sectorsize) == 0);
408 ASSERT((s % cp->provider->sectorsize) == 0);
409
410 for (; off < end; off += maxio, p += maxio, s -= maxio, j++) {
411 bios[j] = g_alloc_bio();
412 bios[j]->bio_cmd = cmds[i];
413 bios[j]->bio_done = NULL;
414 bios[j]->bio_offset = off;
415 bios[j]->bio_length = MIN(s, maxio);
416 bios[j]->bio_data = p;
417 g_io_request(bios[j], cp);
418 }
419 }
420 ASSERT(j == n_bios);
421
422 /* Wait for all of the bios to complete, and clean them up */
423 for (i = j = 0; i < ncmds; i++) {
424 off = offsets[i];
425 s = sizes[i];
426 end = off + s;
427
428 for (; off < end; off += maxio, s -= maxio, j++) {
429 errors[i] = biowait(bios[j], "vdev_geom_io") || errors[i];
430 g_destroy_bio(bios[j]);
431 }
432 }
433 kmem_free(bios, bios_size);
434 }
435
436 /*
437 * Read the vdev config from a device. Return the number of valid labels that
438 * were found. The vdev config will be returned in config if and only if at
439 * least one valid label was found.
440 */
441 static int
vdev_geom_read_config(struct g_consumer * cp,nvlist_t ** configp)442 vdev_geom_read_config(struct g_consumer *cp, nvlist_t **configp)
443 {
444 struct g_provider *pp;
445 nvlist_t *config;
446 vdev_phys_t *vdev_lists[VDEV_LABELS];
447 char *buf;
448 size_t buflen;
449 uint64_t psize, state, txg;
450 off_t offsets[VDEV_LABELS];
451 off_t size;
452 off_t sizes[VDEV_LABELS];
453 int cmds[VDEV_LABELS];
454 int errors[VDEV_LABELS];
455 int l, nlabels;
456
457 g_topology_assert_not();
458
459 pp = cp->provider;
460 ZFS_LOG(1, "Reading config from %s...", pp->name);
461
462 psize = pp->mediasize;
463 psize = P2ALIGN(psize, (uint64_t)sizeof(vdev_label_t));
464
465 size = sizeof(*vdev_lists[0]) + pp->sectorsize -
466 ((sizeof(*vdev_lists[0]) - 1) % pp->sectorsize) - 1;
467
468 buflen = sizeof(vdev_lists[0]->vp_nvlist);
469
470 /* Create all of the IO requests */
471 for (l = 0; l < VDEV_LABELS; l++) {
472 cmds[l] = BIO_READ;
473 vdev_lists[l] = kmem_alloc(size, KM_SLEEP);
474 offsets[l] = vdev_label_offset(psize, l, 0) + VDEV_SKIP_SIZE;
475 sizes[l] = size;
476 errors[l] = 0;
477 ASSERT(offsets[l] % pp->sectorsize == 0);
478 }
479
480 /* Issue the IO requests */
481 vdev_geom_io(cp, cmds, (void**)vdev_lists, offsets, sizes, errors,
482 VDEV_LABELS);
483
484 /* Parse the labels */
485 config = *configp = NULL;
486 nlabels = 0;
487 for (l = 0; l < VDEV_LABELS; l++) {
488 if (errors[l] != 0)
489 continue;
490
491 buf = vdev_lists[l]->vp_nvlist;
492
493 if (nvlist_unpack(buf, buflen, &config, 0) != 0)
494 continue;
495
496 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
497 &state) != 0 || state > POOL_STATE_L2CACHE) {
498 nvlist_free(config);
499 continue;
500 }
501
502 if (state != POOL_STATE_SPARE &&
503 state != POOL_STATE_L2CACHE &&
504 (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG,
505 &txg) != 0 || txg == 0)) {
506 nvlist_free(config);
507 continue;
508 }
509
510 if (*configp != NULL)
511 nvlist_free(*configp);
512 *configp = config;
513
514 nlabels++;
515 }
516
517 /* Free the label storage */
518 for (l = 0; l < VDEV_LABELS; l++)
519 kmem_free(vdev_lists[l], size);
520
521 return (nlabels);
522 }
523
524 static void
resize_configs(nvlist_t *** configs,uint64_t * count,uint64_t id)525 resize_configs(nvlist_t ***configs, uint64_t *count, uint64_t id)
526 {
527 nvlist_t **new_configs;
528 uint64_t i;
529
530 if (id < *count)
531 return;
532 new_configs = kmem_zalloc((id + 1) * sizeof(nvlist_t *),
533 KM_SLEEP);
534 for (i = 0; i < *count; i++)
535 new_configs[i] = (*configs)[i];
536 if (*configs != NULL)
537 kmem_free(*configs, *count * sizeof(void *));
538 *configs = new_configs;
539 *count = id + 1;
540 }
541
542 static void
process_vdev_config(nvlist_t *** configs,uint64_t * count,nvlist_t * cfg,const char * name,uint64_t * known_pool_guid)543 process_vdev_config(nvlist_t ***configs, uint64_t *count, nvlist_t *cfg,
544 const char *name, uint64_t* known_pool_guid)
545 {
546 nvlist_t *vdev_tree;
547 uint64_t pool_guid;
548 uint64_t vdev_guid, known_guid;
549 uint64_t id, txg, known_txg;
550 char *pname;
551 int i;
552
553 if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &pname) != 0 ||
554 strcmp(pname, name) != 0)
555 goto ignore;
556
557 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
558 goto ignore;
559
560 if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_TOP_GUID, &vdev_guid) != 0)
561 goto ignore;
562
563 if (nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0)
564 goto ignore;
565
566 if (nvlist_lookup_uint64(vdev_tree, ZPOOL_CONFIG_ID, &id) != 0)
567 goto ignore;
568
569 VERIFY(nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, &txg) == 0);
570
571 if (*known_pool_guid != 0) {
572 if (pool_guid != *known_pool_guid)
573 goto ignore;
574 } else
575 *known_pool_guid = pool_guid;
576
577 resize_configs(configs, count, id);
578
579 if ((*configs)[id] != NULL) {
580 VERIFY(nvlist_lookup_uint64((*configs)[id],
581 ZPOOL_CONFIG_POOL_TXG, &known_txg) == 0);
582 if (txg <= known_txg)
583 goto ignore;
584 nvlist_free((*configs)[id]);
585 }
586
587 (*configs)[id] = cfg;
588 return;
589
590 ignore:
591 nvlist_free(cfg);
592 }
593
594 int
vdev_geom_read_pool_label(const char * name,nvlist_t *** configs,uint64_t * count)595 vdev_geom_read_pool_label(const char *name,
596 nvlist_t ***configs, uint64_t *count)
597 {
598 struct g_class *mp;
599 struct g_geom *gp;
600 struct g_provider *pp;
601 struct g_consumer *zcp;
602 nvlist_t *vdev_cfg;
603 uint64_t pool_guid;
604 int error, nlabels;
605
606 DROP_GIANT();
607 g_topology_lock();
608
609 *configs = NULL;
610 *count = 0;
611 pool_guid = 0;
612 LIST_FOREACH(mp, &g_classes, class) {
613 if (mp == &zfs_vdev_class)
614 continue;
615 LIST_FOREACH(gp, &mp->geom, geom) {
616 if (gp->flags & G_GEOM_WITHER)
617 continue;
618 LIST_FOREACH(pp, &gp->provider, provider) {
619 if (pp->flags & G_PF_WITHER)
620 continue;
621 zcp = vdev_geom_attach(pp, NULL, B_TRUE);
622 if (zcp == NULL)
623 continue;
624 g_topology_unlock();
625 nlabels = vdev_geom_read_config(zcp, &vdev_cfg);
626 g_topology_lock();
627 vdev_geom_detach(zcp, B_TRUE);
628 if (nlabels == 0)
629 continue;
630 ZFS_LOG(1, "successfully read vdev config");
631
632 process_vdev_config(configs, count,
633 vdev_cfg, name, &pool_guid);
634 }
635 }
636 }
637 g_topology_unlock();
638 PICKUP_GIANT();
639
640 return (*count > 0 ? 0 : ENOENT);
641 }
642
643 enum match {
644 NO_MATCH = 0, /* No matching labels found */
645 TOPGUID_MATCH = 1, /* Labels match top guid, not vdev guid*/
646 ZERO_MATCH = 1, /* Should never be returned */
647 ONE_MATCH = 2, /* 1 label matching the vdev_guid */
648 TWO_MATCH = 3, /* 2 label matching the vdev_guid */
649 THREE_MATCH = 4, /* 3 label matching the vdev_guid */
650 FULL_MATCH = 5 /* all labels match the vdev_guid */
651 };
652
653 static enum match
vdev_attach_ok(vdev_t * vd,struct g_provider * pp)654 vdev_attach_ok(vdev_t *vd, struct g_provider *pp)
655 {
656 nvlist_t *config;
657 uint64_t pool_guid, top_guid, vdev_guid;
658 struct g_consumer *cp;
659 int nlabels;
660
661 cp = vdev_geom_attach(pp, NULL, B_TRUE);
662 if (cp == NULL) {
663 ZFS_LOG(1, "Unable to attach tasting instance to %s.",
664 pp->name);
665 return (NO_MATCH);
666 }
667 g_topology_unlock();
668 nlabels = vdev_geom_read_config(cp, &config);
669 g_topology_lock();
670 vdev_geom_detach(cp, B_TRUE);
671 if (nlabels == 0) {
672 ZFS_LOG(1, "Unable to read config from %s.", pp->name);
673 return (NO_MATCH);
674 }
675
676 pool_guid = 0;
677 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid);
678 top_guid = 0;
679 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, &top_guid);
680 vdev_guid = 0;
681 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid);
682 nvlist_free(config);
683
684 /*
685 * Check that the label's pool guid matches the desired guid.
686 * Inactive spares and L2ARCs do not have any pool guid in the label.
687 */
688 if (pool_guid != 0 && pool_guid != spa_guid(vd->vdev_spa)) {
689 ZFS_LOG(1, "pool guid mismatch for provider %s: %ju != %ju.",
690 pp->name,
691 (uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)pool_guid);
692 return (NO_MATCH);
693 }
694
695 /*
696 * Check that the label's vdev guid matches the desired guid.
697 * The second condition handles possible race on vdev detach, when
698 * remaining vdev receives GUID of destroyed top level mirror vdev.
699 */
700 if (vdev_guid == vd->vdev_guid) {
701 ZFS_LOG(1, "guids match for provider %s.", pp->name);
702 return (ZERO_MATCH + nlabels);
703 } else if (top_guid == vd->vdev_guid && vd == vd->vdev_top) {
704 ZFS_LOG(1, "top vdev guid match for provider %s.", pp->name);
705 return (TOPGUID_MATCH);
706 }
707 ZFS_LOG(1, "vdev guid mismatch for provider %s: %ju != %ju.",
708 pp->name, (uintmax_t)vd->vdev_guid, (uintmax_t)vdev_guid);
709 return (NO_MATCH);
710 }
711
712 static struct g_consumer *
vdev_geom_attach_by_guids(vdev_t * vd)713 vdev_geom_attach_by_guids(vdev_t *vd)
714 {
715 struct g_class *mp;
716 struct g_geom *gp;
717 struct g_provider *pp, *best_pp;
718 struct g_consumer *cp;
719 const char *vdpath;
720 enum match match, best_match;
721
722 g_topology_assert();
723
724 vdpath = vd->vdev_path + sizeof("/dev/") - 1;
725 cp = NULL;
726 best_pp = NULL;
727 best_match = NO_MATCH;
728 LIST_FOREACH(mp, &g_classes, class) {
729 if (mp == &zfs_vdev_class)
730 continue;
731 LIST_FOREACH(gp, &mp->geom, geom) {
732 if (gp->flags & G_GEOM_WITHER)
733 continue;
734 LIST_FOREACH(pp, &gp->provider, provider) {
735 match = vdev_attach_ok(vd, pp);
736 if (match > best_match) {
737 best_match = match;
738 best_pp = pp;
739 } else if (match == best_match) {
740 if (strcmp(pp->name, vdpath) == 0) {
741 best_pp = pp;
742 }
743 }
744 if (match == FULL_MATCH)
745 goto out;
746 }
747 }
748 }
749
750 out:
751 if (best_pp) {
752 cp = vdev_geom_attach(best_pp, vd, B_TRUE);
753 if (cp == NULL) {
754 printf("ZFS WARNING: Unable to attach to %s.\n",
755 best_pp->name);
756 }
757 }
758 return (cp);
759 }
760
761 static struct g_consumer *
vdev_geom_open_by_guids(vdev_t * vd)762 vdev_geom_open_by_guids(vdev_t *vd)
763 {
764 struct g_consumer *cp;
765 char *buf;
766 size_t len;
767
768 g_topology_assert();
769
770 ZFS_LOG(1, "Searching by guids [%ju:%ju].",
771 (uintmax_t)spa_guid(vd->vdev_spa), (uintmax_t)vd->vdev_guid);
772 cp = vdev_geom_attach_by_guids(vd);
773 if (cp != NULL) {
774 len = strlen(cp->provider->name) + strlen("/dev/") + 1;
775 buf = kmem_alloc(len, KM_SLEEP);
776
777 snprintf(buf, len, "/dev/%s", cp->provider->name);
778 spa_strfree(vd->vdev_path);
779 vd->vdev_path = buf;
780
781 ZFS_LOG(1, "Attach by guid [%ju:%ju] succeeded, provider %s.",
782 (uintmax_t)spa_guid(vd->vdev_spa),
783 (uintmax_t)vd->vdev_guid, cp->provider->name);
784 } else {
785 ZFS_LOG(1, "Search by guid [%ju:%ju] failed.",
786 (uintmax_t)spa_guid(vd->vdev_spa),
787 (uintmax_t)vd->vdev_guid);
788 }
789
790 return (cp);
791 }
792
793 static struct g_consumer *
vdev_geom_open_by_path(vdev_t * vd,int check_guid)794 vdev_geom_open_by_path(vdev_t *vd, int check_guid)
795 {
796 struct g_provider *pp;
797 struct g_consumer *cp;
798
799 g_topology_assert();
800
801 cp = NULL;
802 pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
803 if (pp != NULL) {
804 ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
805 if (!check_guid || vdev_attach_ok(vd, pp) == FULL_MATCH)
806 cp = vdev_geom_attach(pp, vd, B_FALSE);
807 }
808
809 return (cp);
810 }
811
812 static int
vdev_geom_open(vdev_t * vd,uint64_t * psize,uint64_t * max_psize,uint64_t * logical_ashift,uint64_t * physical_ashift)813 vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
814 uint64_t *logical_ashift, uint64_t *physical_ashift)
815 {
816 struct g_provider *pp;
817 struct g_consumer *cp;
818 size_t bufsize;
819 int error;
820
821 /* Set the TLS to indicate downstack that we should not access zvols*/
822 VERIFY(tsd_set(zfs_geom_probe_vdev_key, vd) == 0);
823
824 /*
825 * We must have a pathname, and it must be absolute.
826 */
827 if (vd->vdev_path == NULL || strncmp(vd->vdev_path, "/dev/", 5) != 0) {
828 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
829 return (EINVAL);
830 }
831
832 /*
833 * Reopen the device if it's not currently open. Otherwise,
834 * just update the physical size of the device.
835 */
836 if ((cp = vd->vdev_tsd) != NULL) {
837 ASSERT(vd->vdev_reopening);
838 goto skip_open;
839 }
840
841 DROP_GIANT();
842 g_topology_lock();
843 error = 0;
844
845 if (vd->vdev_spa->spa_splitting_newspa ||
846 (vd->vdev_prevstate == VDEV_STATE_UNKNOWN &&
847 vd->vdev_spa->spa_load_state == SPA_LOAD_NONE ||
848 vd->vdev_spa->spa_load_state == SPA_LOAD_CREATE)) {
849 /*
850 * We are dealing with a vdev that hasn't been previously
851 * opened (since boot), and we are not loading an
852 * existing pool configuration. This looks like a
853 * vdev add operation to a new or existing pool.
854 * Assume the user knows what he/she is doing and find
855 * GEOM provider by its name, ignoring GUID mismatches.
856 *
857 * XXPOLICY: It would be safer to only allow a device
858 * that is unlabeled or labeled but missing
859 * GUID information to be opened in this fashion,
860 * unless we are doing a split, in which case we
861 * should allow any guid.
862 */
863 cp = vdev_geom_open_by_path(vd, 0);
864 } else {
865 /*
866 * Try using the recorded path for this device, but only
867 * accept it if its label data contains the expected GUIDs.
868 */
869 cp = vdev_geom_open_by_path(vd, 1);
870 if (cp == NULL) {
871 /*
872 * The device at vd->vdev_path doesn't have the
873 * expected GUIDs. The disks might have merely
874 * moved around so try all other GEOM providers
875 * to find one with the right GUIDs.
876 */
877 cp = vdev_geom_open_by_guids(vd);
878 }
879 }
880
881 /* Clear the TLS now that tasting is done */
882 VERIFY(tsd_set(zfs_geom_probe_vdev_key, NULL) == 0);
883
884 if (cp == NULL) {
885 ZFS_LOG(1, "Vdev %s not found.", vd->vdev_path);
886 error = ENOENT;
887 } else {
888 struct consumer_priv_t *priv;
889 struct consumer_vdev_elem *elem;
890 int spamode;
891
892 priv = (struct consumer_priv_t*)&cp->private;
893 if (cp->private == NULL)
894 SLIST_INIT(priv);
895 elem = g_malloc(sizeof(*elem), M_WAITOK|M_ZERO);
896 elem->vd = vd;
897 SLIST_INSERT_HEAD(priv, elem, elems);
898
899 spamode = spa_mode(vd->vdev_spa);
900 if (cp->provider->sectorsize > VDEV_PAD_SIZE ||
901 !ISP2(cp->provider->sectorsize)) {
902 ZFS_LOG(1, "Provider %s has unsupported sectorsize.",
903 cp->provider->name);
904
905 vdev_geom_close_locked(vd);
906 error = EINVAL;
907 cp = NULL;
908 } else if (cp->acw == 0 && (spamode & FWRITE) != 0) {
909 int i;
910
911 for (i = 0; i < 5; i++) {
912 error = g_access(cp, 0, 1, 0);
913 if (error == 0)
914 break;
915 g_topology_unlock();
916 tsleep(vd, 0, "vdev", hz / 2);
917 g_topology_lock();
918 }
919 if (error != 0) {
920 printf("ZFS WARNING: Unable to open %s for writing (error=%d).\n",
921 cp->provider->name, error);
922 vdev_geom_close_locked(vd);
923 cp = NULL;
924 }
925 }
926 }
927
928 /* Fetch initial physical path information for this device. */
929 if (cp != NULL) {
930 vdev_geom_attrchanged(cp, "GEOM::physpath");
931
932 /* Set other GEOM characteristics */
933 vdev_geom_set_physpath(vd, cp, /*do_null_update*/B_FALSE);
934 vdev_geom_set_rotation_rate(vd, cp);
935 }
936
937 g_topology_unlock();
938 PICKUP_GIANT();
939 if (cp == NULL) {
940 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
941 vdev_dbgmsg(vd, "vdev_geom_open: failed to open [error=%d]",
942 error);
943 return (error);
944 }
945 skip_open:
946 pp = cp->provider;
947
948 /*
949 * Determine the actual size of the device.
950 */
951 *max_psize = *psize = pp->mediasize;
952
953 /*
954 * Determine the device's minimum transfer size and preferred
955 * transfer size.
956 */
957 *logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
958 *physical_ashift = 0;
959 if (pp->stripesize > (1 << *logical_ashift) && ISP2(pp->stripesize) &&
960 pp->stripesize <= (1 << SPA_MAXASHIFT) && pp->stripeoffset == 0)
961 *physical_ashift = highbit(pp->stripesize) - 1;
962
963 /*
964 * Clear the nowritecache settings, so that on a vdev_reopen()
965 * we will try again.
966 */
967 vd->vdev_nowritecache = B_FALSE;
968
969 return (0);
970 }
971
972 static void
vdev_geom_close(vdev_t * vd)973 vdev_geom_close(vdev_t *vd)
974 {
975 struct g_consumer *cp;
976
977 cp = vd->vdev_tsd;
978
979 DROP_GIANT();
980 g_topology_lock();
981
982 if (!vd->vdev_reopening ||
983 (cp != NULL && ((cp->flags & G_CF_ORPHAN) != 0 ||
984 (cp->provider != NULL && cp->provider->error != 0))))
985 vdev_geom_close_locked(vd);
986
987 g_topology_unlock();
988 PICKUP_GIANT();
989 }
990
991 static void
vdev_geom_io_intr(struct bio * bp)992 vdev_geom_io_intr(struct bio *bp)
993 {
994 vdev_t *vd;
995 zio_t *zio;
996
997 zio = bp->bio_caller1;
998 vd = zio->io_vd;
999 zio->io_error = bp->bio_error;
1000 if (zio->io_error == 0 && bp->bio_resid != 0)
1001 zio->io_error = SET_ERROR(EIO);
1002
1003 switch(zio->io_error) {
1004 case ENOTSUP:
1005 /*
1006 * If we get ENOTSUP for BIO_FLUSH or BIO_DELETE we know
1007 * that future attempts will never succeed. In this case
1008 * we set a persistent flag so that we don't bother with
1009 * requests in the future.
1010 */
1011 switch(bp->bio_cmd) {
1012 case BIO_FLUSH:
1013 vd->vdev_nowritecache = B_TRUE;
1014 break;
1015 case BIO_DELETE:
1016 vd->vdev_notrim = B_TRUE;
1017 break;
1018 }
1019 break;
1020 case ENXIO:
1021 if (!vd->vdev_remove_wanted) {
1022 /*
1023 * If provider's error is set we assume it is being
1024 * removed.
1025 */
1026 if (bp->bio_to->error != 0) {
1027 vd->vdev_remove_wanted = B_TRUE;
1028 spa_async_request(zio->io_spa,
1029 SPA_ASYNC_REMOVE);
1030 } else if (!vd->vdev_delayed_close) {
1031 vd->vdev_delayed_close = B_TRUE;
1032 }
1033 }
1034 break;
1035 }
1036
1037 /*
1038 * We have to split bio freeing into two parts, because the ABD code
1039 * cannot be called in this context and vdev_op_io_done is not called
1040 * for ZIO_TYPE_IOCTL zio-s.
1041 */
1042 if (zio->io_type != ZIO_TYPE_READ && zio->io_type != ZIO_TYPE_WRITE) {
1043 g_destroy_bio(bp);
1044 zio->io_bio = NULL;
1045 }
1046 zio_delay_interrupt(zio);
1047 }
1048
1049 static void
vdev_geom_io_start(zio_t * zio)1050 vdev_geom_io_start(zio_t *zio)
1051 {
1052 vdev_t *vd;
1053 struct g_consumer *cp;
1054 struct bio *bp;
1055 int error;
1056
1057 vd = zio->io_vd;
1058
1059 switch (zio->io_type) {
1060 case ZIO_TYPE_IOCTL:
1061 /* XXPOLICY */
1062 if (!vdev_readable(vd)) {
1063 zio->io_error = SET_ERROR(ENXIO);
1064 zio_interrupt(zio);
1065 return;
1066 } else {
1067 switch (zio->io_cmd) {
1068 case DKIOCFLUSHWRITECACHE:
1069 if (zfs_nocacheflush || vdev_geom_bio_flush_disable)
1070 break;
1071 if (vd->vdev_nowritecache) {
1072 zio->io_error = SET_ERROR(ENOTSUP);
1073 break;
1074 }
1075 goto sendreq;
1076 default:
1077 zio->io_error = SET_ERROR(ENOTSUP);
1078 }
1079 }
1080
1081 zio_execute(zio);
1082 return;
1083 case ZIO_TYPE_FREE:
1084 if (vd->vdev_notrim) {
1085 zio->io_error = SET_ERROR(ENOTSUP);
1086 } else if (!vdev_geom_bio_delete_disable) {
1087 goto sendreq;
1088 }
1089 zio_execute(zio);
1090 return;
1091 }
1092 sendreq:
1093 ASSERT(zio->io_type == ZIO_TYPE_READ ||
1094 zio->io_type == ZIO_TYPE_WRITE ||
1095 zio->io_type == ZIO_TYPE_FREE ||
1096 zio->io_type == ZIO_TYPE_IOCTL);
1097
1098 cp = vd->vdev_tsd;
1099 if (cp == NULL) {
1100 zio->io_error = SET_ERROR(ENXIO);
1101 zio_interrupt(zio);
1102 return;
1103 }
1104 bp = g_alloc_bio();
1105 bp->bio_caller1 = zio;
1106 switch (zio->io_type) {
1107 case ZIO_TYPE_READ:
1108 case ZIO_TYPE_WRITE:
1109 zio->io_target_timestamp = zio_handle_io_delay(zio);
1110 bp->bio_offset = zio->io_offset;
1111 bp->bio_length = zio->io_size;
1112 if (zio->io_type == ZIO_TYPE_READ) {
1113 bp->bio_cmd = BIO_READ;
1114 bp->bio_data =
1115 abd_borrow_buf(zio->io_abd, zio->io_size);
1116 } else {
1117 bp->bio_cmd = BIO_WRITE;
1118 bp->bio_data =
1119 abd_borrow_buf_copy(zio->io_abd, zio->io_size);
1120 }
1121 break;
1122 case ZIO_TYPE_FREE:
1123 bp->bio_cmd = BIO_DELETE;
1124 bp->bio_data = NULL;
1125 bp->bio_offset = zio->io_offset;
1126 bp->bio_length = zio->io_size;
1127 break;
1128 case ZIO_TYPE_IOCTL:
1129 bp->bio_cmd = BIO_FLUSH;
1130 bp->bio_data = NULL;
1131 bp->bio_offset = cp->provider->mediasize;
1132 bp->bio_length = 0;
1133 break;
1134 }
1135 bp->bio_done = vdev_geom_io_intr;
1136 zio->io_bio = bp;
1137
1138 g_io_request(bp, cp);
1139 }
1140
1141 static void
vdev_geom_io_done(zio_t * zio)1142 vdev_geom_io_done(zio_t *zio)
1143 {
1144 struct bio *bp = zio->io_bio;
1145
1146 if (zio->io_type != ZIO_TYPE_READ && zio->io_type != ZIO_TYPE_WRITE) {
1147 ASSERT(bp == NULL);
1148 return;
1149 }
1150
1151 if (bp == NULL) {
1152 ASSERT3S(zio->io_error, ==, ENXIO);
1153 return;
1154 }
1155
1156 if (zio->io_type == ZIO_TYPE_READ)
1157 abd_return_buf_copy(zio->io_abd, bp->bio_data, zio->io_size);
1158 else
1159 abd_return_buf(zio->io_abd, bp->bio_data, zio->io_size);
1160
1161 g_destroy_bio(bp);
1162 zio->io_bio = NULL;
1163 }
1164
1165 static void
vdev_geom_hold(vdev_t * vd)1166 vdev_geom_hold(vdev_t *vd)
1167 {
1168 }
1169
1170 static void
vdev_geom_rele(vdev_t * vd)1171 vdev_geom_rele(vdev_t *vd)
1172 {
1173 }
1174
1175 vdev_ops_t vdev_geom_ops = {
1176 vdev_geom_open,
1177 vdev_geom_close,
1178 vdev_default_asize,
1179 vdev_geom_io_start,
1180 vdev_geom_io_done,
1181 NULL,
1182 NULL,
1183 vdev_geom_hold,
1184 vdev_geom_rele,
1185 NULL,
1186 vdev_default_xlate,
1187 VDEV_TYPE_DISK, /* name of this vdev type */
1188 B_TRUE /* leaf vdev */
1189 };
1190