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 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2013 by Delphix. All rights reserved.
26 */
27
28 #include <sys/zfs_context.h>
29 #include <sys/fm/fs/zfs.h>
30 #include <sys/spa.h>
31 #include <sys/spa_impl.h>
32 #include <sys/dmu.h>
33 #include <sys/dmu_tx.h>
34 #include <sys/vdev_impl.h>
35 #include <sys/uberblock_impl.h>
36 #include <sys/metaslab.h>
37 #include <sys/metaslab_impl.h>
38 #include <sys/space_map.h>
39 #include <sys/zio.h>
40 #include <sys/zap.h>
41 #include <sys/fs/zfs.h>
42 #include <sys/arc.h>
43 #include <sys/zil.h>
44 #include <sys/dsl_scan.h>
45
46 /*
47 * Virtual device management.
48 */
49
50 static vdev_ops_t *vdev_ops_table[] = {
51 &vdev_root_ops,
52 &vdev_raidz_ops,
53 &vdev_mirror_ops,
54 &vdev_replacing_ops,
55 &vdev_spare_ops,
56 &vdev_disk_ops,
57 &vdev_file_ops,
58 &vdev_missing_ops,
59 &vdev_hole_ops,
60 NULL
61 };
62
63 /* maximum scrub/resilver I/O queue per leaf vdev */
64 int zfs_scrub_limit = 10;
65
66 /*
67 * Given a vdev type, return the appropriate ops vector.
68 */
69 static vdev_ops_t *
70 vdev_getops(const char *type)
71 {
72 vdev_ops_t *ops, **opspp;
73
74 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++)
75 if (strcmp(ops->vdev_op_type, type) == 0)
76 break;
77
78 return (ops);
79 }
80
81 /*
82 * Default asize function: return the MAX of psize with the asize of
83 * all children. This is what's used by anything other than RAID-Z.
84 */
85 uint64_t
86 vdev_default_asize(vdev_t *vd, uint64_t psize)
87 {
88 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift);
89 uint64_t csize;
90
91 for (int c = 0; c < vd->vdev_children; c++) {
92 csize = vdev_psize_to_asize(vd->vdev_child[c], psize);
93 asize = MAX(asize, csize);
94 }
95
96 return (asize);
97 }
98
99 /*
100 * Get the minimum allocatable size. We define the allocatable size as
101 * the vdev's asize rounded to the nearest metaslab. This allows us to
102 * replace or attach devices which don't have the same physical size but
103 * can still satisfy the same number of allocations.
104 */
105 uint64_t
106 vdev_get_min_asize(vdev_t *vd)
107 {
108 vdev_t *pvd = vd->vdev_parent;
109
110 /*
111 * If our parent is NULL (inactive spare or cache) or is the root,
112 * just return our own asize.
113 */
114 if (pvd == NULL)
115 return (vd->vdev_asize);
116
117 /*
118 * The top-level vdev just returns the allocatable size rounded
119 * to the nearest metaslab.
120 */
121 if (vd == vd->vdev_top)
122 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift));
123
124 /*
125 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
126 * so each child must provide at least 1/Nth of its asize.
127 */
128 if (pvd->vdev_ops == &vdev_raidz_ops)
129 return (pvd->vdev_min_asize / pvd->vdev_children);
130
131 return (pvd->vdev_min_asize);
132 }
133
134 void
135 vdev_set_min_asize(vdev_t *vd)
136 {
137 vd->vdev_min_asize = vdev_get_min_asize(vd);
138
139 for (int c = 0; c < vd->vdev_children; c++)
140 vdev_set_min_asize(vd->vdev_child[c]);
141 }
142
143 vdev_t *
144 vdev_lookup_top(spa_t *spa, uint64_t vdev)
145 {
146 vdev_t *rvd = spa->spa_root_vdev;
147
148 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
149
150 if (vdev < rvd->vdev_children) {
151 ASSERT(rvd->vdev_child[vdev] != NULL);
152 return (rvd->vdev_child[vdev]);
153 }
154
155 return (NULL);
156 }
157
158 vdev_t *
159 vdev_lookup_by_guid(vdev_t *vd, uint64_t guid)
160 {
161 vdev_t *mvd;
162
163 if (vd->vdev_guid == guid)
164 return (vd);
165
166 for (int c = 0; c < vd->vdev_children; c++)
167 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) !=
168 NULL)
169 return (mvd);
170
171 return (NULL);
172 }
173
174 void
175 vdev_add_child(vdev_t *pvd, vdev_t *cvd)
176 {
177 size_t oldsize, newsize;
178 uint64_t id = cvd->vdev_id;
179 vdev_t **newchild;
180
181 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
182 ASSERT(cvd->vdev_parent == NULL);
183
184 cvd->vdev_parent = pvd;
185
186 if (pvd == NULL)
187 return;
188
189 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL);
190
191 oldsize = pvd->vdev_children * sizeof (vdev_t *);
192 pvd->vdev_children = MAX(pvd->vdev_children, id + 1);
193 newsize = pvd->vdev_children * sizeof (vdev_t *);
194
195 newchild = kmem_zalloc(newsize, KM_SLEEP);
196 if (pvd->vdev_child != NULL) {
197 bcopy(pvd->vdev_child, newchild, oldsize);
198 kmem_free(pvd->vdev_child, oldsize);
199 }
200
201 pvd->vdev_child = newchild;
202 pvd->vdev_child[id] = cvd;
203
204 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd);
205 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL);
206
207 /*
208 * Walk up all ancestors to update guid sum.
209 */
210 for (; pvd != NULL; pvd = pvd->vdev_parent)
211 pvd->vdev_guid_sum += cvd->vdev_guid_sum;
212 }
213
214 void
215 vdev_remove_child(vdev_t *pvd, vdev_t *cvd)
216 {
217 int c;
218 uint_t id = cvd->vdev_id;
219
220 ASSERT(cvd->vdev_parent == pvd);
221
222 if (pvd == NULL)
223 return;
224
225 ASSERT(id < pvd->vdev_children);
226 ASSERT(pvd->vdev_child[id] == cvd);
227
228 pvd->vdev_child[id] = NULL;
229 cvd->vdev_parent = NULL;
230
231 for (c = 0; c < pvd->vdev_children; c++)
232 if (pvd->vdev_child[c])
233 break;
234
235 if (c == pvd->vdev_children) {
236 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *));
237 pvd->vdev_child = NULL;
238 pvd->vdev_children = 0;
239 }
240
241 /*
242 * Walk up all ancestors to update guid sum.
243 */
244 for (; pvd != NULL; pvd = pvd->vdev_parent)
245 pvd->vdev_guid_sum -= cvd->vdev_guid_sum;
246 }
247
248 /*
249 * Remove any holes in the child array.
250 */
251 void
252 vdev_compact_children(vdev_t *pvd)
253 {
254 vdev_t **newchild, *cvd;
255 int oldc = pvd->vdev_children;
256 int newc;
257
258 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
259
260 for (int c = newc = 0; c < oldc; c++)
261 if (pvd->vdev_child[c])
262 newc++;
263
264 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP);
265
266 for (int c = newc = 0; c < oldc; c++) {
267 if ((cvd = pvd->vdev_child[c]) != NULL) {
268 newchild[newc] = cvd;
269 cvd->vdev_id = newc++;
270 }
271 }
272
273 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *));
274 pvd->vdev_child = newchild;
275 pvd->vdev_children = newc;
276 }
277
278 /*
279 * Allocate and minimally initialize a vdev_t.
280 */
281 vdev_t *
282 vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops)
283 {
284 vdev_t *vd;
285
286 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP);
287
288 if (spa->spa_root_vdev == NULL) {
289 ASSERT(ops == &vdev_root_ops);
290 spa->spa_root_vdev = vd;
291 spa->spa_load_guid = spa_generate_guid(NULL);
292 }
293
294 if (guid == 0 && ops != &vdev_hole_ops) {
295 if (spa->spa_root_vdev == vd) {
296 /*
297 * The root vdev's guid will also be the pool guid,
298 * which must be unique among all pools.
299 */
300 guid = spa_generate_guid(NULL);
301 } else {
302 /*
303 * Any other vdev's guid must be unique within the pool.
304 */
305 guid = spa_generate_guid(spa);
306 }
307 ASSERT(!spa_guid_exists(spa_guid(spa), guid));
308 }
309
310 vd->vdev_spa = spa;
311 vd->vdev_id = id;
312 vd->vdev_guid = guid;
313 vd->vdev_guid_sum = guid;
314 vd->vdev_ops = ops;
315 vd->vdev_state = VDEV_STATE_CLOSED;
316 vd->vdev_ishole = (ops == &vdev_hole_ops);
317
318 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL);
319 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL);
320 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL);
321 for (int t = 0; t < DTL_TYPES; t++) {
322 space_map_create(&vd->vdev_dtl[t], 0, -1ULL, 0,
323 &vd->vdev_dtl_lock);
324 }
325 txg_list_create(&vd->vdev_ms_list,
326 offsetof(struct metaslab, ms_txg_node));
327 txg_list_create(&vd->vdev_dtl_list,
328 offsetof(struct vdev, vdev_dtl_node));
329 vd->vdev_stat.vs_timestamp = gethrtime();
330 vdev_queue_init(vd);
331 vdev_cache_init(vd);
332
333 return (vd);
334 }
335
336 /*
337 * Allocate a new vdev. The 'alloctype' is used to control whether we are
338 * creating a new vdev or loading an existing one - the behavior is slightly
339 * different for each case.
340 */
341 int
342 vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id,
343 int alloctype)
344 {
345 vdev_ops_t *ops;
346 char *type;
347 uint64_t guid = 0, islog, nparity;
348 vdev_t *vd;
349
350 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
351
352 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
353 return (SET_ERROR(EINVAL));
354
355 if ((ops = vdev_getops(type)) == NULL)
356 return (SET_ERROR(EINVAL));
357
358 /*
359 * If this is a load, get the vdev guid from the nvlist.
360 * Otherwise, vdev_alloc_common() will generate one for us.
361 */
362 if (alloctype == VDEV_ALLOC_LOAD) {
363 uint64_t label_id;
364
365 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) ||
366 label_id != id)
367 return (SET_ERROR(EINVAL));
368
369 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
370 return (SET_ERROR(EINVAL));
371 } else if (alloctype == VDEV_ALLOC_SPARE) {
372 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
373 return (SET_ERROR(EINVAL));
374 } else if (alloctype == VDEV_ALLOC_L2CACHE) {
375 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
376 return (SET_ERROR(EINVAL));
377 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) {
378 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
379 return (SET_ERROR(EINVAL));
380 }
381
382 /*
383 * The first allocated vdev must be of type 'root'.
384 */
385 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL)
386 return (SET_ERROR(EINVAL));
387
388 /*
389 * Determine whether we're a log vdev.
390 */
391 islog = 0;
392 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog);
393 if (islog && spa_version(spa) < SPA_VERSION_SLOGS)
394 return (SET_ERROR(ENOTSUP));
395
396 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES)
397 return (SET_ERROR(ENOTSUP));
398
399 /*
400 * Set the nparity property for RAID-Z vdevs.
401 */
402 nparity = -1ULL;
403 if (ops == &vdev_raidz_ops) {
404 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
405 &nparity) == 0) {
406 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY)
407 return (SET_ERROR(EINVAL));
408 /*
409 * Previous versions could only support 1 or 2 parity
410 * device.
411 */
412 if (nparity > 1 &&
413 spa_version(spa) < SPA_VERSION_RAIDZ2)
414 return (SET_ERROR(ENOTSUP));
415 if (nparity > 2 &&
416 spa_version(spa) < SPA_VERSION_RAIDZ3)
417 return (SET_ERROR(ENOTSUP));
418 } else {
419 /*
420 * We require the parity to be specified for SPAs that
421 * support multiple parity levels.
422 */
423 if (spa_version(spa) >= SPA_VERSION_RAIDZ2)
424 return (SET_ERROR(EINVAL));
425 /*
426 * Otherwise, we default to 1 parity device for RAID-Z.
427 */
428 nparity = 1;
429 }
430 } else {
431 nparity = 0;
432 }
433 ASSERT(nparity != -1ULL);
434
435 vd = vdev_alloc_common(spa, id, guid, ops);
436
437 vd->vdev_islog = islog;
438 vd->vdev_nparity = nparity;
439
440 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0)
441 vd->vdev_path = spa_strdup(vd->vdev_path);
442 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0)
443 vd->vdev_devid = spa_strdup(vd->vdev_devid);
444 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH,
445 &vd->vdev_physpath) == 0)
446 vd->vdev_physpath = spa_strdup(vd->vdev_physpath);
447 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0)
448 vd->vdev_fru = spa_strdup(vd->vdev_fru);
449
450 /*
451 * Set the whole_disk property. If it's not specified, leave the value
452 * as -1.
453 */
454 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
455 &vd->vdev_wholedisk) != 0)
456 vd->vdev_wholedisk = -1ULL;
457
458 /*
459 * Look for the 'not present' flag. This will only be set if the device
460 * was not present at the time of import.
461 */
462 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
463 &vd->vdev_not_present);
464
465 /*
466 * Get the alignment requirement.
467 */
468 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift);
469
470 /*
471 * Retrieve the vdev creation time.
472 */
473 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG,
474 &vd->vdev_crtxg);
475
476 /*
477 * If we're a top-level vdev, try to load the allocation parameters.
478 */
479 if (parent && !parent->vdev_parent &&
480 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) {
481 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
482 &vd->vdev_ms_array);
483 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
484 &vd->vdev_ms_shift);
485 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE,
486 &vd->vdev_asize);
487 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING,
488 &vd->vdev_removing);
489 }
490
491 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) {
492 ASSERT(alloctype == VDEV_ALLOC_LOAD ||
493 alloctype == VDEV_ALLOC_ADD ||
494 alloctype == VDEV_ALLOC_SPLIT ||
495 alloctype == VDEV_ALLOC_ROOTPOOL);
496 vd->vdev_mg = metaslab_group_create(islog ?
497 spa_log_class(spa) : spa_normal_class(spa), vd);
498 }
499
500 /*
501 * If we're a leaf vdev, try to load the DTL object and other state.
502 */
503 if (vd->vdev_ops->vdev_op_leaf &&
504 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE ||
505 alloctype == VDEV_ALLOC_ROOTPOOL)) {
506 if (alloctype == VDEV_ALLOC_LOAD) {
507 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL,
508 &vd->vdev_dtl_smo.smo_object);
509 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE,
510 &vd->vdev_unspare);
511 }
512
513 if (alloctype == VDEV_ALLOC_ROOTPOOL) {
514 uint64_t spare = 0;
515
516 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
517 &spare) == 0 && spare)
518 spa_spare_add(vd);
519 }
520
521 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE,
522 &vd->vdev_offline);
523
524 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVERING,
525 &vd->vdev_resilvering);
526
527 /*
528 * When importing a pool, we want to ignore the persistent fault
529 * state, as the diagnosis made on another system may not be
530 * valid in the current context. Local vdevs will
531 * remain in the faulted state.
532 */
533 if (spa_load_state(spa) == SPA_LOAD_OPEN) {
534 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED,
535 &vd->vdev_faulted);
536 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED,
537 &vd->vdev_degraded);
538 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED,
539 &vd->vdev_removed);
540
541 if (vd->vdev_faulted || vd->vdev_degraded) {
542 char *aux;
543
544 vd->vdev_label_aux =
545 VDEV_AUX_ERR_EXCEEDED;
546 if (nvlist_lookup_string(nv,
547 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 &&
548 strcmp(aux, "external") == 0)
549 vd->vdev_label_aux = VDEV_AUX_EXTERNAL;
550 }
551 }
552 }
553
554 /*
555 * Add ourselves to the parent's list of children.
556 */
557 vdev_add_child(parent, vd);
558
559 *vdp = vd;
560
561 return (0);
562 }
563
564 void
565 vdev_free(vdev_t *vd)
566 {
567 spa_t *spa = vd->vdev_spa;
568
569 /*
570 * vdev_free() implies closing the vdev first. This is simpler than
571 * trying to ensure complicated semantics for all callers.
572 */
573 vdev_close(vd);
574
575 ASSERT(!list_link_active(&vd->vdev_config_dirty_node));
576 ASSERT(!list_link_active(&vd->vdev_state_dirty_node));
577
578 /*
579 * Free all children.
580 */
581 for (int c = 0; c < vd->vdev_children; c++)
582 vdev_free(vd->vdev_child[c]);
583
584 ASSERT(vd->vdev_child == NULL);
585 ASSERT(vd->vdev_guid_sum == vd->vdev_guid);
586
587 /*
588 * Discard allocation state.
589 */
590 if (vd->vdev_mg != NULL) {
591 vdev_metaslab_fini(vd);
592 metaslab_group_destroy(vd->vdev_mg);
593 }
594
595 ASSERT0(vd->vdev_stat.vs_space);
596 ASSERT0(vd->vdev_stat.vs_dspace);
597 ASSERT0(vd->vdev_stat.vs_alloc);
598
599 /*
600 * Remove this vdev from its parent's child list.
601 */
602 vdev_remove_child(vd->vdev_parent, vd);
603
604 ASSERT(vd->vdev_parent == NULL);
605
606 /*
607 * Clean up vdev structure.
608 */
609 vdev_queue_fini(vd);
610 vdev_cache_fini(vd);
611
612 if (vd->vdev_path)
613 spa_strfree(vd->vdev_path);
614 if (vd->vdev_devid)
615 spa_strfree(vd->vdev_devid);
616 if (vd->vdev_physpath)
617 spa_strfree(vd->vdev_physpath);
618 if (vd->vdev_fru)
619 spa_strfree(vd->vdev_fru);
620
621 if (vd->vdev_isspare)
622 spa_spare_remove(vd);
623 if (vd->vdev_isl2cache)
624 spa_l2cache_remove(vd);
625
626 txg_list_destroy(&vd->vdev_ms_list);
627 txg_list_destroy(&vd->vdev_dtl_list);
628
629 mutex_enter(&vd->vdev_dtl_lock);
630 for (int t = 0; t < DTL_TYPES; t++) {
631 space_map_unload(&vd->vdev_dtl[t]);
632 space_map_destroy(&vd->vdev_dtl[t]);
633 }
634 mutex_exit(&vd->vdev_dtl_lock);
635
636 mutex_destroy(&vd->vdev_dtl_lock);
637 mutex_destroy(&vd->vdev_stat_lock);
638 mutex_destroy(&vd->vdev_probe_lock);
639
640 if (vd == spa->spa_root_vdev)
641 spa->spa_root_vdev = NULL;
642
643 kmem_free(vd, sizeof (vdev_t));
644 }
645
646 /*
647 * Transfer top-level vdev state from svd to tvd.
648 */
649 static void
650 vdev_top_transfer(vdev_t *svd, vdev_t *tvd)
651 {
652 spa_t *spa = svd->vdev_spa;
653 metaslab_t *msp;
654 vdev_t *vd;
655 int t;
656
657 ASSERT(tvd == tvd->vdev_top);
658
659 tvd->vdev_ms_array = svd->vdev_ms_array;
660 tvd->vdev_ms_shift = svd->vdev_ms_shift;
661 tvd->vdev_ms_count = svd->vdev_ms_count;
662
663 svd->vdev_ms_array = 0;
664 svd->vdev_ms_shift = 0;
665 svd->vdev_ms_count = 0;
666
667 if (tvd->vdev_mg)
668 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg);
669 tvd->vdev_mg = svd->vdev_mg;
670 tvd->vdev_ms = svd->vdev_ms;
671
672 svd->vdev_mg = NULL;
673 svd->vdev_ms = NULL;
674
675 if (tvd->vdev_mg != NULL)
676 tvd->vdev_mg->mg_vd = tvd;
677
678 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc;
679 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space;
680 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace;
681
682 svd->vdev_stat.vs_alloc = 0;
683 svd->vdev_stat.vs_space = 0;
684 svd->vdev_stat.vs_dspace = 0;
685
686 for (t = 0; t < TXG_SIZE; t++) {
687 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL)
688 (void) txg_list_add(&tvd->vdev_ms_list, msp, t);
689 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL)
690 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t);
691 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t))
692 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t);
693 }
694
695 if (list_link_active(&svd->vdev_config_dirty_node)) {
696 vdev_config_clean(svd);
697 vdev_config_dirty(tvd);
698 }
699
700 if (list_link_active(&svd->vdev_state_dirty_node)) {
701 vdev_state_clean(svd);
702 vdev_state_dirty(tvd);
703 }
704
705 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio;
706 svd->vdev_deflate_ratio = 0;
707
708 tvd->vdev_islog = svd->vdev_islog;
709 svd->vdev_islog = 0;
710 }
711
712 static void
713 vdev_top_update(vdev_t *tvd, vdev_t *vd)
714 {
715 if (vd == NULL)
716 return;
717
718 vd->vdev_top = tvd;
719
720 for (int c = 0; c < vd->vdev_children; c++)
721 vdev_top_update(tvd, vd->vdev_child[c]);
722 }
723
724 /*
725 * Add a mirror/replacing vdev above an existing vdev.
726 */
727 vdev_t *
728 vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops)
729 {
730 spa_t *spa = cvd->vdev_spa;
731 vdev_t *pvd = cvd->vdev_parent;
732 vdev_t *mvd;
733
734 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
735
736 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops);
737
738 mvd->vdev_asize = cvd->vdev_asize;
739 mvd->vdev_min_asize = cvd->vdev_min_asize;
740 mvd->vdev_max_asize = cvd->vdev_max_asize;
741 mvd->vdev_ashift = cvd->vdev_ashift;
742 mvd->vdev_state = cvd->vdev_state;
743 mvd->vdev_crtxg = cvd->vdev_crtxg;
744
745 vdev_remove_child(pvd, cvd);
746 vdev_add_child(pvd, mvd);
747 cvd->vdev_id = mvd->vdev_children;
748 vdev_add_child(mvd, cvd);
749 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
750
751 if (mvd == mvd->vdev_top)
752 vdev_top_transfer(cvd, mvd);
753
754 return (mvd);
755 }
756
757 /*
758 * Remove a 1-way mirror/replacing vdev from the tree.
759 */
760 void
761 vdev_remove_parent(vdev_t *cvd)
762 {
763 vdev_t *mvd = cvd->vdev_parent;
764 vdev_t *pvd = mvd->vdev_parent;
765
766 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
767
768 ASSERT(mvd->vdev_children == 1);
769 ASSERT(mvd->vdev_ops == &vdev_mirror_ops ||
770 mvd->vdev_ops == &vdev_replacing_ops ||
771 mvd->vdev_ops == &vdev_spare_ops);
772 cvd->vdev_ashift = mvd->vdev_ashift;
773
774 vdev_remove_child(mvd, cvd);
775 vdev_remove_child(pvd, mvd);
776
777 /*
778 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
779 * Otherwise, we could have detached an offline device, and when we
780 * go to import the pool we'll think we have two top-level vdevs,
781 * instead of a different version of the same top-level vdev.
782 */
783 if (mvd->vdev_top == mvd) {
784 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid;
785 cvd->vdev_orig_guid = cvd->vdev_guid;
786 cvd->vdev_guid += guid_delta;
787 cvd->vdev_guid_sum += guid_delta;
788 }
789 cvd->vdev_id = mvd->vdev_id;
790 vdev_add_child(pvd, cvd);
791 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
792
793 if (cvd == cvd->vdev_top)
794 vdev_top_transfer(mvd, cvd);
795
796 ASSERT(mvd->vdev_children == 0);
797 vdev_free(mvd);
798 }
799
800 int
801 vdev_metaslab_init(vdev_t *vd, uint64_t txg)
802 {
803 spa_t *spa = vd->vdev_spa;
804 objset_t *mos = spa->spa_meta_objset;
805 uint64_t m;
806 uint64_t oldc = vd->vdev_ms_count;
807 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift;
808 metaslab_t **mspp;
809 int error;
810
811 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER));
812
813 /*
814 * This vdev is not being allocated from yet or is a hole.
815 */
816 if (vd->vdev_ms_shift == 0)
817 return (0);
818
819 ASSERT(!vd->vdev_ishole);
820
821 /*
822 * Compute the raidz-deflation ratio. Note, we hard-code
823 * in 128k (1 << 17) because it is the current "typical" blocksize.
824 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change,
825 * or we will inconsistently account for existing bp's.
826 */
827 vd->vdev_deflate_ratio = (1 << 17) /
828 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT);
829
830 ASSERT(oldc <= newc);
831
832 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP);
833
834 if (oldc != 0) {
835 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp));
836 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp));
837 }
838
839 vd->vdev_ms = mspp;
840 vd->vdev_ms_count = newc;
841
842 for (m = oldc; m < newc; m++) {
843 space_map_obj_t smo = { 0, 0, 0 };
844 if (txg == 0) {
845 uint64_t object = 0;
846 error = dmu_read(mos, vd->vdev_ms_array,
847 m * sizeof (uint64_t), sizeof (uint64_t), &object,
848 DMU_READ_PREFETCH);
849 if (error)
850 return (error);
851 if (object != 0) {
852 dmu_buf_t *db;
853 error = dmu_bonus_hold(mos, object, FTAG, &db);
854 if (error)
855 return (error);
856 ASSERT3U(db->db_size, >=, sizeof (smo));
857 bcopy(db->db_data, &smo, sizeof (smo));
858 ASSERT3U(smo.smo_object, ==, object);
859 dmu_buf_rele(db, FTAG);
860 }
861 }
862 vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, &smo,
863 m << vd->vdev_ms_shift, 1ULL << vd->vdev_ms_shift, txg);
864 }
865
866 if (txg == 0)
867 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER);
868
869 /*
870 * If the vdev is being removed we don't activate
871 * the metaslabs since we want to ensure that no new
872 * allocations are performed on this device.
873 */
874 if (oldc == 0 && !vd->vdev_removing)
875 metaslab_group_activate(vd->vdev_mg);
876
877 if (txg == 0)
878 spa_config_exit(spa, SCL_ALLOC, FTAG);
879
880 return (0);
881 }
882
883 void
884 vdev_metaslab_fini(vdev_t *vd)
885 {
886 uint64_t m;
887 uint64_t count = vd->vdev_ms_count;
888
889 if (vd->vdev_ms != NULL) {
890 metaslab_group_passivate(vd->vdev_mg);
891 for (m = 0; m < count; m++)
892 if (vd->vdev_ms[m] != NULL)
893 metaslab_fini(vd->vdev_ms[m]);
894 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *));
895 vd->vdev_ms = NULL;
896 }
897 }
898
899 typedef struct vdev_probe_stats {
900 boolean_t vps_readable;
901 boolean_t vps_writeable;
902 int vps_flags;
903 } vdev_probe_stats_t;
904
905 static void
906 vdev_probe_done(zio_t *zio)
907 {
908 spa_t *spa = zio->io_spa;
909 vdev_t *vd = zio->io_vd;
910 vdev_probe_stats_t *vps = zio->io_private;
911
912 ASSERT(vd->vdev_probe_zio != NULL);
913
914 if (zio->io_type == ZIO_TYPE_READ) {
915 if (zio->io_error == 0)
916 vps->vps_readable = 1;
917 if (zio->io_error == 0 && spa_writeable(spa)) {
918 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd,
919 zio->io_offset, zio->io_size, zio->io_data,
920 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
921 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE));
922 } else {
923 zio_buf_free(zio->io_data, zio->io_size);
924 }
925 } else if (zio->io_type == ZIO_TYPE_WRITE) {
926 if (zio->io_error == 0)
927 vps->vps_writeable = 1;
928 zio_buf_free(zio->io_data, zio->io_size);
929 } else if (zio->io_type == ZIO_TYPE_NULL) {
930 zio_t *pio;
931
932 vd->vdev_cant_read |= !vps->vps_readable;
933 vd->vdev_cant_write |= !vps->vps_writeable;
934
935 if (vdev_readable(vd) &&
936 (vdev_writeable(vd) || !spa_writeable(spa))) {
937 zio->io_error = 0;
938 } else {
939 ASSERT(zio->io_error != 0);
940 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE,
941 spa, vd, NULL, 0, 0);
942 zio->io_error = SET_ERROR(ENXIO);
943 }
944
945 mutex_enter(&vd->vdev_probe_lock);
946 ASSERT(vd->vdev_probe_zio == zio);
947 vd->vdev_probe_zio = NULL;
948 mutex_exit(&vd->vdev_probe_lock);
949
950 while ((pio = zio_walk_parents(zio)) != NULL)
951 if (!vdev_accessible(vd, pio))
952 pio->io_error = SET_ERROR(ENXIO);
953
954 kmem_free(vps, sizeof (*vps));
955 }
956 }
957
958 /*
959 * Determine whether this device is accessible.
960 *
961 * Read and write to several known locations: the pad regions of each
962 * vdev label but the first, which we leave alone in case it contains
963 * a VTOC.
964 */
965 zio_t *
966 vdev_probe(vdev_t *vd, zio_t *zio)
967 {
968 spa_t *spa = vd->vdev_spa;
969 vdev_probe_stats_t *vps = NULL;
970 zio_t *pio;
971
972 ASSERT(vd->vdev_ops->vdev_op_leaf);
973
974 /*
975 * Don't probe the probe.
976 */
977 if (zio && (zio->io_flags & ZIO_FLAG_PROBE))
978 return (NULL);
979
980 /*
981 * To prevent 'probe storms' when a device fails, we create
982 * just one probe i/o at a time. All zios that want to probe
983 * this vdev will become parents of the probe io.
984 */
985 mutex_enter(&vd->vdev_probe_lock);
986
987 if ((pio = vd->vdev_probe_zio) == NULL) {
988 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP);
989
990 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE |
991 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE |
992 ZIO_FLAG_TRYHARD;
993
994 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) {
995 /*
996 * vdev_cant_read and vdev_cant_write can only
997 * transition from TRUE to FALSE when we have the
998 * SCL_ZIO lock as writer; otherwise they can only
999 * transition from FALSE to TRUE. This ensures that
1000 * any zio looking at these values can assume that
1001 * failures persist for the life of the I/O. That's
1002 * important because when a device has intermittent
1003 * connectivity problems, we want to ensure that
1004 * they're ascribed to the device (ENXIO) and not
1005 * the zio (EIO).
1006 *
1007 * Since we hold SCL_ZIO as writer here, clear both
1008 * values so the probe can reevaluate from first
1009 * principles.
1010 */
1011 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER;
1012 vd->vdev_cant_read = B_FALSE;
1013 vd->vdev_cant_write = B_FALSE;
1014 }
1015
1016 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd,
1017 vdev_probe_done, vps,
1018 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE);
1019
1020 /*
1021 * We can't change the vdev state in this context, so we
1022 * kick off an async task to do it on our behalf.
1023 */
1024 if (zio != NULL) {
1025 vd->vdev_probe_wanted = B_TRUE;
1026 spa_async_request(spa, SPA_ASYNC_PROBE);
1027 }
1028 }
1029
1030 if (zio != NULL)
1031 zio_add_child(zio, pio);
1032
1033 mutex_exit(&vd->vdev_probe_lock);
1034
1035 if (vps == NULL) {
1036 ASSERT(zio != NULL);
1037 return (NULL);
1038 }
1039
1040 for (int l = 1; l < VDEV_LABELS; l++) {
1041 zio_nowait(zio_read_phys(pio, vd,
1042 vdev_label_offset(vd->vdev_psize, l,
1043 offsetof(vdev_label_t, vl_pad2)),
1044 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE),
1045 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
1046 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE));
1047 }
1048
1049 if (zio == NULL)
1050 return (pio);
1051
1052 zio_nowait(pio);
1053 return (NULL);
1054 }
1055
1056 static void
1057 vdev_open_child(void *arg)
1058 {
1059 vdev_t *vd = arg;
1060
1061 vd->vdev_open_thread = curthread;
1062 vd->vdev_open_error = vdev_open(vd);
1063 vd->vdev_open_thread = NULL;
1064 }
1065
1066 boolean_t
1067 vdev_uses_zvols(vdev_t *vd)
1068 {
1069 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR,
1070 strlen(ZVOL_DIR)) == 0)
1071 return (B_TRUE);
1072 for (int c = 0; c < vd->vdev_children; c++)
1073 if (vdev_uses_zvols(vd->vdev_child[c]))
1074 return (B_TRUE);
1075 return (B_FALSE);
1076 }
1077
1078 void
1079 vdev_open_children(vdev_t *vd)
1080 {
1081 taskq_t *tq;
1082 int children = vd->vdev_children;
1083
1084 /*
1085 * in order to handle pools on top of zvols, do the opens
1086 * in a single thread so that the same thread holds the
1087 * spa_namespace_lock
1088 */
1089 if (vdev_uses_zvols(vd)) {
1090 for (int c = 0; c < children; c++)
1091 vd->vdev_child[c]->vdev_open_error =
1092 vdev_open(vd->vdev_child[c]);
1093 return;
1094 }
1095 tq = taskq_create("vdev_open", children, minclsyspri,
1096 children, children, TASKQ_PREPOPULATE);
1097
1098 for (int c = 0; c < children; c++)
1099 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c],
1100 TQ_SLEEP) != NULL);
1101
1102 taskq_destroy(tq);
1103 }
1104
1105 /*
1106 * Prepare a virtual device for access.
1107 */
1108 int
1109 vdev_open(vdev_t *vd)
1110 {
1111 spa_t *spa = vd->vdev_spa;
1112 int error;
1113 uint64_t osize = 0;
1114 uint64_t max_osize = 0;
1115 uint64_t asize, max_asize, psize;
1116 uint64_t ashift = 0;
1117
1118 ASSERT(vd->vdev_open_thread == curthread ||
1119 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1120 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED ||
1121 vd->vdev_state == VDEV_STATE_CANT_OPEN ||
1122 vd->vdev_state == VDEV_STATE_OFFLINE);
1123
1124 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1125 vd->vdev_cant_read = B_FALSE;
1126 vd->vdev_cant_write = B_FALSE;
1127 vd->vdev_min_asize = vdev_get_min_asize(vd);
1128
1129 /*
1130 * If this vdev is not removed, check its fault status. If it's
1131 * faulted, bail out of the open.
1132 */
1133 if (!vd->vdev_removed && vd->vdev_faulted) {
1134 ASSERT(vd->vdev_children == 0);
1135 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1136 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1137 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1138 vd->vdev_label_aux);
1139 return (SET_ERROR(ENXIO));
1140 } else if (vd->vdev_offline) {
1141 ASSERT(vd->vdev_children == 0);
1142 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE);
1143 return (SET_ERROR(ENXIO));
1144 }
1145
1146 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, &ashift);
1147
1148 /*
1149 * Reset the vdev_reopening flag so that we actually close
1150 * the vdev on error.
1151 */
1152 vd->vdev_reopening = B_FALSE;
1153 if (zio_injection_enabled && error == 0)
1154 error = zio_handle_device_injection(vd, NULL, ENXIO);
1155
1156 if (error) {
1157 if (vd->vdev_removed &&
1158 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED)
1159 vd->vdev_removed = B_FALSE;
1160
1161 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1162 vd->vdev_stat.vs_aux);
1163 return (error);
1164 }
1165
1166 vd->vdev_removed = B_FALSE;
1167
1168 /*
1169 * Recheck the faulted flag now that we have confirmed that
1170 * the vdev is accessible. If we're faulted, bail.
1171 */
1172 if (vd->vdev_faulted) {
1173 ASSERT(vd->vdev_children == 0);
1174 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1175 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1176 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1177 vd->vdev_label_aux);
1178 return (SET_ERROR(ENXIO));
1179 }
1180
1181 if (vd->vdev_degraded) {
1182 ASSERT(vd->vdev_children == 0);
1183 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1184 VDEV_AUX_ERR_EXCEEDED);
1185 } else {
1186 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0);
1187 }
1188
1189 /*
1190 * For hole or missing vdevs we just return success.
1191 */
1192 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops)
1193 return (0);
1194
1195 for (int c = 0; c < vd->vdev_children; c++) {
1196 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) {
1197 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1198 VDEV_AUX_NONE);
1199 break;
1200 }
1201 }
1202
1203 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t));
1204 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t));
1205
1206 if (vd->vdev_children == 0) {
1207 if (osize < SPA_MINDEVSIZE) {
1208 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1209 VDEV_AUX_TOO_SMALL);
1210 return (SET_ERROR(EOVERFLOW));
1211 }
1212 psize = osize;
1213 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE);
1214 max_asize = max_osize - (VDEV_LABEL_START_SIZE +
1215 VDEV_LABEL_END_SIZE);
1216 } else {
1217 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE -
1218 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) {
1219 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1220 VDEV_AUX_TOO_SMALL);
1221 return (SET_ERROR(EOVERFLOW));
1222 }
1223 psize = 0;
1224 asize = osize;
1225 max_asize = max_osize;
1226 }
1227
1228 vd->vdev_psize = psize;
1229
1230 /*
1231 * Make sure the allocatable size hasn't shrunk.
1232 */
1233 if (asize < vd->vdev_min_asize) {
1234 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1235 VDEV_AUX_BAD_LABEL);
1236 return (SET_ERROR(EINVAL));
1237 }
1238
1239 if (vd->vdev_asize == 0) {
1240 /*
1241 * This is the first-ever open, so use the computed values.
1242 * For testing purposes, a higher ashift can be requested.
1243 */
1244 vd->vdev_asize = asize;
1245 vd->vdev_max_asize = max_asize;
1246 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift);
1247 } else {
1248 /*
1249 * Detect if the alignment requirement has increased.
1250 * We don't want to make the pool unavailable, just
1251 * issue a warning instead.
1252 */
1253 if (ashift > vd->vdev_top->vdev_ashift &&
1254 vd->vdev_ops->vdev_op_leaf) {
1255 cmn_err(CE_WARN,
1256 "Disk, '%s', has a block alignment that is "
1257 "larger than the pool's alignment\n",
1258 vd->vdev_path);
1259 }
1260 vd->vdev_max_asize = max_asize;
1261 }
1262
1263 /*
1264 * If all children are healthy and the asize has increased,
1265 * then we've experienced dynamic LUN growth. If automatic
1266 * expansion is enabled then use the additional space.
1267 */
1268 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize &&
1269 (vd->vdev_expanding || spa->spa_autoexpand))
1270 vd->vdev_asize = asize;
1271
1272 vdev_set_min_asize(vd);
1273
1274 /*
1275 * Ensure we can issue some IO before declaring the
1276 * vdev open for business.
1277 */
1278 if (vd->vdev_ops->vdev_op_leaf &&
1279 (error = zio_wait(vdev_probe(vd, NULL))) != 0) {
1280 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1281 VDEV_AUX_ERR_EXCEEDED);
1282 return (error);
1283 }
1284
1285 /*
1286 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1287 * resilver. But don't do this if we are doing a reopen for a scrub,
1288 * since this would just restart the scrub we are already doing.
1289 */
1290 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen &&
1291 vdev_resilver_needed(vd, NULL, NULL))
1292 spa_async_request(spa, SPA_ASYNC_RESILVER);
1293
1294 return (0);
1295 }
1296
1297 /*
1298 * Called once the vdevs are all opened, this routine validates the label
1299 * contents. This needs to be done before vdev_load() so that we don't
1300 * inadvertently do repair I/Os to the wrong device.
1301 *
1302 * If 'strict' is false ignore the spa guid check. This is necessary because
1303 * if the machine crashed during a re-guid the new guid might have been written
1304 * to all of the vdev labels, but not the cached config. The strict check
1305 * will be performed when the pool is opened again using the mos config.
1306 *
1307 * This function will only return failure if one of the vdevs indicates that it
1308 * has since been destroyed or exported. This is only possible if
1309 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1310 * will be updated but the function will return 0.
1311 */
1312 int
1313 vdev_validate(vdev_t *vd, boolean_t strict)
1314 {
1315 spa_t *spa = vd->vdev_spa;
1316 nvlist_t *label;
1317 uint64_t guid = 0, top_guid;
1318 uint64_t state;
1319
1320 for (int c = 0; c < vd->vdev_children; c++)
1321 if (vdev_validate(vd->vdev_child[c], strict) != 0)
1322 return (SET_ERROR(EBADF));
1323
1324 /*
1325 * If the device has already failed, or was marked offline, don't do
1326 * any further validation. Otherwise, label I/O will fail and we will
1327 * overwrite the previous state.
1328 */
1329 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
1330 uint64_t aux_guid = 0;
1331 nvlist_t *nvl;
1332 uint64_t txg = spa_last_synced_txg(spa) != 0 ?
1333 spa_last_synced_txg(spa) : -1ULL;
1334
1335 if ((label = vdev_label_read_config(vd, txg)) == NULL) {
1336 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1337 VDEV_AUX_BAD_LABEL);
1338 return (0);
1339 }
1340
1341 /*
1342 * Determine if this vdev has been split off into another
1343 * pool. If so, then refuse to open it.
1344 */
1345 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID,
1346 &aux_guid) == 0 && aux_guid == spa_guid(spa)) {
1347 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1348 VDEV_AUX_SPLIT_POOL);
1349 nvlist_free(label);
1350 return (0);
1351 }
1352
1353 if (strict && (nvlist_lookup_uint64(label,
1354 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 ||
1355 guid != spa_guid(spa))) {
1356 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1357 VDEV_AUX_CORRUPT_DATA);
1358 nvlist_free(label);
1359 return (0);
1360 }
1361
1362 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl)
1363 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID,
1364 &aux_guid) != 0)
1365 aux_guid = 0;
1366
1367 /*
1368 * If this vdev just became a top-level vdev because its
1369 * sibling was detached, it will have adopted the parent's
1370 * vdev guid -- but the label may or may not be on disk yet.
1371 * Fortunately, either version of the label will have the
1372 * same top guid, so if we're a top-level vdev, we can
1373 * safely compare to that instead.
1374 *
1375 * If we split this vdev off instead, then we also check the
1376 * original pool's guid. We don't want to consider the vdev
1377 * corrupt if it is partway through a split operation.
1378 */
1379 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID,
1380 &guid) != 0 ||
1381 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID,
1382 &top_guid) != 0 ||
1383 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) &&
1384 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) {
1385 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1386 VDEV_AUX_CORRUPT_DATA);
1387 nvlist_free(label);
1388 return (0);
1389 }
1390
1391 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE,
1392 &state) != 0) {
1393 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1394 VDEV_AUX_CORRUPT_DATA);
1395 nvlist_free(label);
1396 return (0);
1397 }
1398
1399 nvlist_free(label);
1400
1401 /*
1402 * If this is a verbatim import, no need to check the
1403 * state of the pool.
1404 */
1405 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) &&
1406 spa_load_state(spa) == SPA_LOAD_OPEN &&
1407 state != POOL_STATE_ACTIVE)
1408 return (SET_ERROR(EBADF));
1409
1410 /*
1411 * If we were able to open and validate a vdev that was
1412 * previously marked permanently unavailable, clear that state
1413 * now.
1414 */
1415 if (vd->vdev_not_present)
1416 vd->vdev_not_present = 0;
1417 }
1418
1419 return (0);
1420 }
1421
1422 /*
1423 * Close a virtual device.
1424 */
1425 void
1426 vdev_close(vdev_t *vd)
1427 {
1428 spa_t *spa = vd->vdev_spa;
1429 vdev_t *pvd = vd->vdev_parent;
1430
1431 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1432
1433 /*
1434 * If our parent is reopening, then we are as well, unless we are
1435 * going offline.
1436 */
1437 if (pvd != NULL && pvd->vdev_reopening)
1438 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline);
1439
1440 vd->vdev_ops->vdev_op_close(vd);
1441
1442 vdev_cache_purge(vd);
1443
1444 /*
1445 * We record the previous state before we close it, so that if we are
1446 * doing a reopen(), we don't generate FMA ereports if we notice that
1447 * it's still faulted.
1448 */
1449 vd->vdev_prevstate = vd->vdev_state;
1450
1451 if (vd->vdev_offline)
1452 vd->vdev_state = VDEV_STATE_OFFLINE;
1453 else
1454 vd->vdev_state = VDEV_STATE_CLOSED;
1455 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1456 }
1457
1458 void
1459 vdev_hold(vdev_t *vd)
1460 {
1461 spa_t *spa = vd->vdev_spa;
1462
1463 ASSERT(spa_is_root(spa));
1464 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1465 return;
1466
1467 for (int c = 0; c < vd->vdev_children; c++)
1468 vdev_hold(vd->vdev_child[c]);
1469
1470 if (vd->vdev_ops->vdev_op_leaf)
1471 vd->vdev_ops->vdev_op_hold(vd);
1472 }
1473
1474 void
1475 vdev_rele(vdev_t *vd)
1476 {
1477 spa_t *spa = vd->vdev_spa;
1478
1479 ASSERT(spa_is_root(spa));
1480 for (int c = 0; c < vd->vdev_children; c++)
1481 vdev_rele(vd->vdev_child[c]);
1482
1483 if (vd->vdev_ops->vdev_op_leaf)
1484 vd->vdev_ops->vdev_op_rele(vd);
1485 }
1486
1487 /*
1488 * Reopen all interior vdevs and any unopened leaves. We don't actually
1489 * reopen leaf vdevs which had previously been opened as they might deadlock
1490 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1491 * If the leaf has never been opened then open it, as usual.
1492 */
1493 void
1494 vdev_reopen(vdev_t *vd)
1495 {
1496 spa_t *spa = vd->vdev_spa;
1497
1498 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1499
1500 /* set the reopening flag unless we're taking the vdev offline */
1501 vd->vdev_reopening = !vd->vdev_offline;
1502 vdev_close(vd);
1503 (void) vdev_open(vd);
1504
1505 /*
1506 * Call vdev_validate() here to make sure we have the same device.
1507 * Otherwise, a device with an invalid label could be successfully
1508 * opened in response to vdev_reopen().
1509 */
1510 if (vd->vdev_aux) {
1511 (void) vdev_validate_aux(vd);
1512 if (vdev_readable(vd) && vdev_writeable(vd) &&
1513 vd->vdev_aux == &spa->spa_l2cache &&
1514 !l2arc_vdev_present(vd))
1515 l2arc_add_vdev(spa, vd);
1516 } else {
1517 (void) vdev_validate(vd, B_TRUE);
1518 }
1519
1520 /*
1521 * Reassess parent vdev's health.
1522 */
1523 vdev_propagate_state(vd);
1524 }
1525
1526 int
1527 vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing)
1528 {
1529 int error;
1530
1531 /*
1532 * Normally, partial opens (e.g. of a mirror) are allowed.
1533 * For a create, however, we want to fail the request if
1534 * there are any components we can't open.
1535 */
1536 error = vdev_open(vd);
1537
1538 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) {
1539 vdev_close(vd);
1540 return (error ? error : ENXIO);
1541 }
1542
1543 /*
1544 * Recursively initialize all labels.
1545 */
1546 if ((error = vdev_label_init(vd, txg, isreplacing ?
1547 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) {
1548 vdev_close(vd);
1549 return (error);
1550 }
1551
1552 return (0);
1553 }
1554
1555 void
1556 vdev_metaslab_set_size(vdev_t *vd)
1557 {
1558 /*
1559 * Aim for roughly 200 metaslabs per vdev.
1560 */
1561 vd->vdev_ms_shift = highbit(vd->vdev_asize / 200);
1562 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
1563 }
1564
1565 void
1566 vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg)
1567 {
1568 ASSERT(vd == vd->vdev_top);
1569 ASSERT(!vd->vdev_ishole);
1570 ASSERT(ISP2(flags));
1571 ASSERT(spa_writeable(vd->vdev_spa));
1572
1573 if (flags & VDD_METASLAB)
1574 (void) txg_list_add(&vd->vdev_ms_list, arg, txg);
1575
1576 if (flags & VDD_DTL)
1577 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg);
1578
1579 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg);
1580 }
1581
1582 /*
1583 * DTLs.
1584 *
1585 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1586 * the vdev has less than perfect replication. There are four kinds of DTL:
1587 *
1588 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1589 *
1590 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1591 *
1592 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1593 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1594 * txgs that was scrubbed.
1595 *
1596 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1597 * persistent errors or just some device being offline.
1598 * Unlike the other three, the DTL_OUTAGE map is not generally
1599 * maintained; it's only computed when needed, typically to
1600 * determine whether a device can be detached.
1601 *
1602 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1603 * either has the data or it doesn't.
1604 *
1605 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1606 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1607 * if any child is less than fully replicated, then so is its parent.
1608 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1609 * comprising only those txgs which appear in 'maxfaults' or more children;
1610 * those are the txgs we don't have enough replication to read. For example,
1611 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1612 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1613 * two child DTL_MISSING maps.
1614 *
1615 * It should be clear from the above that to compute the DTLs and outage maps
1616 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1617 * Therefore, that is all we keep on disk. When loading the pool, or after
1618 * a configuration change, we generate all other DTLs from first principles.
1619 */
1620 void
1621 vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1622 {
1623 space_map_t *sm = &vd->vdev_dtl[t];
1624
1625 ASSERT(t < DTL_TYPES);
1626 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1627 ASSERT(spa_writeable(vd->vdev_spa));
1628
1629 mutex_enter(sm->sm_lock);
1630 if (!space_map_contains(sm, txg, size))
1631 space_map_add(sm, txg, size);
1632 mutex_exit(sm->sm_lock);
1633 }
1634
1635 boolean_t
1636 vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1637 {
1638 space_map_t *sm = &vd->vdev_dtl[t];
1639 boolean_t dirty = B_FALSE;
1640
1641 ASSERT(t < DTL_TYPES);
1642 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1643
1644 mutex_enter(sm->sm_lock);
1645 if (sm->sm_space != 0)
1646 dirty = space_map_contains(sm, txg, size);
1647 mutex_exit(sm->sm_lock);
1648
1649 return (dirty);
1650 }
1651
1652 boolean_t
1653 vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t)
1654 {
1655 space_map_t *sm = &vd->vdev_dtl[t];
1656 boolean_t empty;
1657
1658 mutex_enter(sm->sm_lock);
1659 empty = (sm->sm_space == 0);
1660 mutex_exit(sm->sm_lock);
1661
1662 return (empty);
1663 }
1664
1665 /*
1666 * Reassess DTLs after a config change or scrub completion.
1667 */
1668 void
1669 vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done)
1670 {
1671 spa_t *spa = vd->vdev_spa;
1672 avl_tree_t reftree;
1673 int minref;
1674
1675 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1676
1677 for (int c = 0; c < vd->vdev_children; c++)
1678 vdev_dtl_reassess(vd->vdev_child[c], txg,
1679 scrub_txg, scrub_done);
1680
1681 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux)
1682 return;
1683
1684 if (vd->vdev_ops->vdev_op_leaf) {
1685 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
1686
1687 mutex_enter(&vd->vdev_dtl_lock);
1688 if (scrub_txg != 0 &&
1689 (spa->spa_scrub_started ||
1690 (scn && scn->scn_phys.scn_errors == 0))) {
1691 /*
1692 * We completed a scrub up to scrub_txg. If we
1693 * did it without rebooting, then the scrub dtl
1694 * will be valid, so excise the old region and
1695 * fold in the scrub dtl. Otherwise, leave the
1696 * dtl as-is if there was an error.
1697 *
1698 * There's little trick here: to excise the beginning
1699 * of the DTL_MISSING map, we put it into a reference
1700 * tree and then add a segment with refcnt -1 that
1701 * covers the range [0, scrub_txg). This means
1702 * that each txg in that range has refcnt -1 or 0.
1703 * We then add DTL_SCRUB with a refcnt of 2, so that
1704 * entries in the range [0, scrub_txg) will have a
1705 * positive refcnt -- either 1 or 2. We then convert
1706 * the reference tree into the new DTL_MISSING map.
1707 */
1708 space_map_ref_create(&reftree);
1709 space_map_ref_add_map(&reftree,
1710 &vd->vdev_dtl[DTL_MISSING], 1);
1711 space_map_ref_add_seg(&reftree, 0, scrub_txg, -1);
1712 space_map_ref_add_map(&reftree,
1713 &vd->vdev_dtl[DTL_SCRUB], 2);
1714 space_map_ref_generate_map(&reftree,
1715 &vd->vdev_dtl[DTL_MISSING], 1);
1716 space_map_ref_destroy(&reftree);
1717 }
1718 space_map_vacate(&vd->vdev_dtl[DTL_PARTIAL], NULL, NULL);
1719 space_map_walk(&vd->vdev_dtl[DTL_MISSING],
1720 space_map_add, &vd->vdev_dtl[DTL_PARTIAL]);
1721 if (scrub_done)
1722 space_map_vacate(&vd->vdev_dtl[DTL_SCRUB], NULL, NULL);
1723 space_map_vacate(&vd->vdev_dtl[DTL_OUTAGE], NULL, NULL);
1724 if (!vdev_readable(vd))
1725 space_map_add(&vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL);
1726 else
1727 space_map_walk(&vd->vdev_dtl[DTL_MISSING],
1728 space_map_add, &vd->vdev_dtl[DTL_OUTAGE]);
1729 mutex_exit(&vd->vdev_dtl_lock);
1730
1731 if (txg != 0)
1732 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg);
1733 return;
1734 }
1735
1736 mutex_enter(&vd->vdev_dtl_lock);
1737 for (int t = 0; t < DTL_TYPES; t++) {
1738 /* account for child's outage in parent's missing map */
1739 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t;
1740 if (t == DTL_SCRUB)
1741 continue; /* leaf vdevs only */
1742 if (t == DTL_PARTIAL)
1743 minref = 1; /* i.e. non-zero */
1744 else if (vd->vdev_nparity != 0)
1745 minref = vd->vdev_nparity + 1; /* RAID-Z */
1746 else
1747 minref = vd->vdev_children; /* any kind of mirror */
1748 space_map_ref_create(&reftree);
1749 for (int c = 0; c < vd->vdev_children; c++) {
1750 vdev_t *cvd = vd->vdev_child[c];
1751 mutex_enter(&cvd->vdev_dtl_lock);
1752 space_map_ref_add_map(&reftree, &cvd->vdev_dtl[s], 1);
1753 mutex_exit(&cvd->vdev_dtl_lock);
1754 }
1755 space_map_ref_generate_map(&reftree, &vd->vdev_dtl[t], minref);
1756 space_map_ref_destroy(&reftree);
1757 }
1758 mutex_exit(&vd->vdev_dtl_lock);
1759 }
1760
1761 static int
1762 vdev_dtl_load(vdev_t *vd)
1763 {
1764 spa_t *spa = vd->vdev_spa;
1765 space_map_obj_t *smo = &vd->vdev_dtl_smo;
1766 objset_t *mos = spa->spa_meta_objset;
1767 dmu_buf_t *db;
1768 int error;
1769
1770 ASSERT(vd->vdev_children == 0);
1771
1772 if (smo->smo_object == 0)
1773 return (0);
1774
1775 ASSERT(!vd->vdev_ishole);
1776
1777 if ((error = dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)) != 0)
1778 return (error);
1779
1780 ASSERT3U(db->db_size, >=, sizeof (*smo));
1781 bcopy(db->db_data, smo, sizeof (*smo));
1782 dmu_buf_rele(db, FTAG);
1783
1784 mutex_enter(&vd->vdev_dtl_lock);
1785 error = space_map_load(&vd->vdev_dtl[DTL_MISSING],
1786 NULL, SM_ALLOC, smo, mos);
1787 mutex_exit(&vd->vdev_dtl_lock);
1788
1789 return (error);
1790 }
1791
1792 void
1793 vdev_dtl_sync(vdev_t *vd, uint64_t txg)
1794 {
1795 spa_t *spa = vd->vdev_spa;
1796 space_map_obj_t *smo = &vd->vdev_dtl_smo;
1797 space_map_t *sm = &vd->vdev_dtl[DTL_MISSING];
1798 objset_t *mos = spa->spa_meta_objset;
1799 space_map_t smsync;
1800 kmutex_t smlock;
1801 dmu_buf_t *db;
1802 dmu_tx_t *tx;
1803
1804 ASSERT(!vd->vdev_ishole);
1805
1806 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1807
1808 if (vd->vdev_detached) {
1809 if (smo->smo_object != 0) {
1810 int err = dmu_object_free(mos, smo->smo_object, tx);
1811 ASSERT0(err);
1812 smo->smo_object = 0;
1813 }
1814 dmu_tx_commit(tx);
1815 return;
1816 }
1817
1818 if (smo->smo_object == 0) {
1819 ASSERT(smo->smo_objsize == 0);
1820 ASSERT(smo->smo_alloc == 0);
1821 smo->smo_object = dmu_object_alloc(mos,
1822 DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT,
1823 DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx);
1824 ASSERT(smo->smo_object != 0);
1825 vdev_config_dirty(vd->vdev_top);
1826 }
1827
1828 mutex_init(&smlock, NULL, MUTEX_DEFAULT, NULL);
1829
1830 space_map_create(&smsync, sm->sm_start, sm->sm_size, sm->sm_shift,
1831 &smlock);
1832
1833 mutex_enter(&smlock);
1834
1835 mutex_enter(&vd->vdev_dtl_lock);
1836 space_map_walk(sm, space_map_add, &smsync);
1837 mutex_exit(&vd->vdev_dtl_lock);
1838
1839 space_map_truncate(smo, mos, tx);
1840 space_map_sync(&smsync, SM_ALLOC, smo, mos, tx);
1841 space_map_vacate(&smsync, NULL, NULL);
1842
1843 space_map_destroy(&smsync);
1844
1845 mutex_exit(&smlock);
1846 mutex_destroy(&smlock);
1847
1848 VERIFY(0 == dmu_bonus_hold(mos, smo->smo_object, FTAG, &db));
1849 dmu_buf_will_dirty(db, tx);
1850 ASSERT3U(db->db_size, >=, sizeof (*smo));
1851 bcopy(smo, db->db_data, sizeof (*smo));
1852 dmu_buf_rele(db, FTAG);
1853
1854 dmu_tx_commit(tx);
1855 }
1856
1857 /*
1858 * Determine whether the specified vdev can be offlined/detached/removed
1859 * without losing data.
1860 */
1861 boolean_t
1862 vdev_dtl_required(vdev_t *vd)
1863 {
1864 spa_t *spa = vd->vdev_spa;
1865 vdev_t *tvd = vd->vdev_top;
1866 uint8_t cant_read = vd->vdev_cant_read;
1867 boolean_t required;
1868
1869 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1870
1871 if (vd == spa->spa_root_vdev || vd == tvd)
1872 return (B_TRUE);
1873
1874 /*
1875 * Temporarily mark the device as unreadable, and then determine
1876 * whether this results in any DTL outages in the top-level vdev.
1877 * If not, we can safely offline/detach/remove the device.
1878 */
1879 vd->vdev_cant_read = B_TRUE;
1880 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
1881 required = !vdev_dtl_empty(tvd, DTL_OUTAGE);
1882 vd->vdev_cant_read = cant_read;
1883 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
1884
1885 if (!required && zio_injection_enabled)
1886 required = !!zio_handle_device_injection(vd, NULL, ECHILD);
1887
1888 return (required);
1889 }
1890
1891 /*
1892 * Determine if resilver is needed, and if so the txg range.
1893 */
1894 boolean_t
1895 vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp)
1896 {
1897 boolean_t needed = B_FALSE;
1898 uint64_t thismin = UINT64_MAX;
1899 uint64_t thismax = 0;
1900
1901 if (vd->vdev_children == 0) {
1902 mutex_enter(&vd->vdev_dtl_lock);
1903 if (vd->vdev_dtl[DTL_MISSING].sm_space != 0 &&
1904 vdev_writeable(vd)) {
1905 space_seg_t *ss;
1906
1907 ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root);
1908 thismin = ss->ss_start - 1;
1909 ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root);
1910 thismax = ss->ss_end;
1911 needed = B_TRUE;
1912 }
1913 mutex_exit(&vd->vdev_dtl_lock);
1914 } else {
1915 for (int c = 0; c < vd->vdev_children; c++) {
1916 vdev_t *cvd = vd->vdev_child[c];
1917 uint64_t cmin, cmax;
1918
1919 if (vdev_resilver_needed(cvd, &cmin, &cmax)) {
1920 thismin = MIN(thismin, cmin);
1921 thismax = MAX(thismax, cmax);
1922 needed = B_TRUE;
1923 }
1924 }
1925 }
1926
1927 if (needed && minp) {
1928 *minp = thismin;
1929 *maxp = thismax;
1930 }
1931 return (needed);
1932 }
1933
1934 void
1935 vdev_load(vdev_t *vd)
1936 {
1937 /*
1938 * Recursively load all children.
1939 */
1940 for (int c = 0; c < vd->vdev_children; c++)
1941 vdev_load(vd->vdev_child[c]);
1942
1943 /*
1944 * If this is a top-level vdev, initialize its metaslabs.
1945 */
1946 if (vd == vd->vdev_top && !vd->vdev_ishole &&
1947 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 ||
1948 vdev_metaslab_init(vd, 0) != 0))
1949 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1950 VDEV_AUX_CORRUPT_DATA);
1951
1952 /*
1953 * If this is a leaf vdev, load its DTL.
1954 */
1955 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0)
1956 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1957 VDEV_AUX_CORRUPT_DATA);
1958 }
1959
1960 /*
1961 * The special vdev case is used for hot spares and l2cache devices. Its
1962 * sole purpose it to set the vdev state for the associated vdev. To do this,
1963 * we make sure that we can open the underlying device, then try to read the
1964 * label, and make sure that the label is sane and that it hasn't been
1965 * repurposed to another pool.
1966 */
1967 int
1968 vdev_validate_aux(vdev_t *vd)
1969 {
1970 nvlist_t *label;
1971 uint64_t guid, version;
1972 uint64_t state;
1973
1974 if (!vdev_readable(vd))
1975 return (0);
1976
1977 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) {
1978 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1979 VDEV_AUX_CORRUPT_DATA);
1980 return (-1);
1981 }
1982
1983 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 ||
1984 !SPA_VERSION_IS_SUPPORTED(version) ||
1985 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 ||
1986 guid != vd->vdev_guid ||
1987 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) {
1988 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1989 VDEV_AUX_CORRUPT_DATA);
1990 nvlist_free(label);
1991 return (-1);
1992 }
1993
1994 /*
1995 * We don't actually check the pool state here. If it's in fact in
1996 * use by another pool, we update this fact on the fly when requested.
1997 */
1998 nvlist_free(label);
1999 return (0);
2000 }
2001
2002 void
2003 vdev_remove(vdev_t *vd, uint64_t txg)
2004 {
2005 spa_t *spa = vd->vdev_spa;
2006 objset_t *mos = spa->spa_meta_objset;
2007 dmu_tx_t *tx;
2008
2009 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);
2010
2011 if (vd->vdev_dtl_smo.smo_object) {
2012 ASSERT0(vd->vdev_dtl_smo.smo_alloc);
2013 (void) dmu_object_free(mos, vd->vdev_dtl_smo.smo_object, tx);
2014 vd->vdev_dtl_smo.smo_object = 0;
2015 }
2016
2017 if (vd->vdev_ms != NULL) {
2018 for (int m = 0; m < vd->vdev_ms_count; m++) {
2019 metaslab_t *msp = vd->vdev_ms[m];
2020
2021 if (msp == NULL || msp->ms_smo.smo_object == 0)
2022 continue;
2023
2024 ASSERT0(msp->ms_smo.smo_alloc);
2025 (void) dmu_object_free(mos, msp->ms_smo.smo_object, tx);
2026 msp->ms_smo.smo_object = 0;
2027 }
2028 }
2029
2030 if (vd->vdev_ms_array) {
2031 (void) dmu_object_free(mos, vd->vdev_ms_array, tx);
2032 vd->vdev_ms_array = 0;
2033 vd->vdev_ms_shift = 0;
2034 }
2035 dmu_tx_commit(tx);
2036 }
2037
2038 void
2039 vdev_sync_done(vdev_t *vd, uint64_t txg)
2040 {
2041 metaslab_t *msp;
2042 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg));
2043
2044 ASSERT(!vd->vdev_ishole);
2045
2046 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg)))
2047 metaslab_sync_done(msp, txg);
2048
2049 if (reassess)
2050 metaslab_sync_reassess(vd->vdev_mg);
2051 }
2052
2053 void
2054 vdev_sync(vdev_t *vd, uint64_t txg)
2055 {
2056 spa_t *spa = vd->vdev_spa;
2057 vdev_t *lvd;
2058 metaslab_t *msp;
2059 dmu_tx_t *tx;
2060
2061 ASSERT(!vd->vdev_ishole);
2062
2063 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) {
2064 ASSERT(vd == vd->vdev_top);
2065 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
2066 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset,
2067 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx);
2068 ASSERT(vd->vdev_ms_array != 0);
2069 vdev_config_dirty(vd);
2070 dmu_tx_commit(tx);
2071 }
2072
2073 /*
2074 * Remove the metadata associated with this vdev once it's empty.
2075 */
2076 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing)
2077 vdev_remove(vd, txg);
2078
2079 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) {
2080 metaslab_sync(msp, txg);
2081 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
2082 }
2083
2084 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL)
2085 vdev_dtl_sync(lvd, txg);
2086
2087 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
2088 }
2089
2090 uint64_t
2091 vdev_psize_to_asize(vdev_t *vd, uint64_t psize)
2092 {
2093 return (vd->vdev_ops->vdev_op_asize(vd, psize));
2094 }
2095
2096 /*
2097 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2098 * not be opened, and no I/O is attempted.
2099 */
2100 int
2101 vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2102 {
2103 vdev_t *vd, *tvd;
2104
2105 spa_vdev_state_enter(spa, SCL_NONE);
2106
2107 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2108 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2109
2110 if (!vd->vdev_ops->vdev_op_leaf)
2111 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2112
2113 tvd = vd->vdev_top;
2114
2115 /*
2116 * We don't directly use the aux state here, but if we do a
2117 * vdev_reopen(), we need this value to be present to remember why we
2118 * were faulted.
2119 */
2120 vd->vdev_label_aux = aux;
2121
2122 /*
2123 * Faulted state takes precedence over degraded.
2124 */
2125 vd->vdev_delayed_close = B_FALSE;
2126 vd->vdev_faulted = 1ULL;
2127 vd->vdev_degraded = 0ULL;
2128 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux);
2129
2130 /*
2131 * If this device has the only valid copy of the data, then
2132 * back off and simply mark the vdev as degraded instead.
2133 */
2134 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) {
2135 vd->vdev_degraded = 1ULL;
2136 vd->vdev_faulted = 0ULL;
2137
2138 /*
2139 * If we reopen the device and it's not dead, only then do we
2140 * mark it degraded.
2141 */
2142 vdev_reopen(tvd);
2143
2144 if (vdev_readable(vd))
2145 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux);
2146 }
2147
2148 return (spa_vdev_state_exit(spa, vd, 0));
2149 }
2150
2151 /*
2152 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2153 * user that something is wrong. The vdev continues to operate as normal as far
2154 * as I/O is concerned.
2155 */
2156 int
2157 vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2158 {
2159 vdev_t *vd;
2160
2161 spa_vdev_state_enter(spa, SCL_NONE);
2162
2163 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2164 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2165
2166 if (!vd->vdev_ops->vdev_op_leaf)
2167 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2168
2169 /*
2170 * If the vdev is already faulted, then don't do anything.
2171 */
2172 if (vd->vdev_faulted || vd->vdev_degraded)
2173 return (spa_vdev_state_exit(spa, NULL, 0));
2174
2175 vd->vdev_degraded = 1ULL;
2176 if (!vdev_is_dead(vd))
2177 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED,
2178 aux);
2179
2180 return (spa_vdev_state_exit(spa, vd, 0));
2181 }
2182
2183 /*
2184 * Online the given vdev.
2185 *
2186 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached
2187 * spare device should be detached when the device finishes resilvering.
2188 * Second, the online should be treated like a 'test' online case, so no FMA
2189 * events are generated if the device fails to open.
2190 */
2191 int
2192 vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate)
2193 {
2194 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev;
2195
2196 spa_vdev_state_enter(spa, SCL_NONE);
2197
2198 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2199 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2200
2201 if (!vd->vdev_ops->vdev_op_leaf)
2202 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2203
2204 tvd = vd->vdev_top;
2205 vd->vdev_offline = B_FALSE;
2206 vd->vdev_tmpoffline = B_FALSE;
2207 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE);
2208 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT);
2209
2210 /* XXX - L2ARC 1.0 does not support expansion */
2211 if (!vd->vdev_aux) {
2212 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2213 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND);
2214 }
2215
2216 vdev_reopen(tvd);
2217 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE;
2218
2219 if (!vd->vdev_aux) {
2220 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2221 pvd->vdev_expanding = B_FALSE;
2222 }
2223
2224 if (newstate)
2225 *newstate = vd->vdev_state;
2226 if ((flags & ZFS_ONLINE_UNSPARE) &&
2227 !vdev_is_dead(vd) && vd->vdev_parent &&
2228 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2229 vd->vdev_parent->vdev_child[0] == vd)
2230 vd->vdev_unspare = B_TRUE;
2231
2232 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) {
2233
2234 /* XXX - L2ARC 1.0 does not support expansion */
2235 if (vd->vdev_aux)
2236 return (spa_vdev_state_exit(spa, vd, ENOTSUP));
2237 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
2238 }
2239 return (spa_vdev_state_exit(spa, vd, 0));
2240 }
2241
2242 static int
2243 vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags)
2244 {
2245 vdev_t *vd, *tvd;
2246 int error = 0;
2247 uint64_t generation;
2248 metaslab_group_t *mg;
2249
2250 top:
2251 spa_vdev_state_enter(spa, SCL_ALLOC);
2252
2253 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2254 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2255
2256 if (!vd->vdev_ops->vdev_op_leaf)
2257 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2258
2259 tvd = vd->vdev_top;
2260 mg = tvd->vdev_mg;
2261 generation = spa->spa_config_generation + 1;
2262
2263 /*
2264 * If the device isn't already offline, try to offline it.
2265 */
2266 if (!vd->vdev_offline) {
2267 /*
2268 * If this device has the only valid copy of some data,
2269 * don't allow it to be offlined. Log devices are always
2270 * expendable.
2271 */
2272 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2273 vdev_dtl_required(vd))
2274 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2275
2276 /*
2277 * If the top-level is a slog and it has had allocations
2278 * then proceed. We check that the vdev's metaslab group
2279 * is not NULL since it's possible that we may have just
2280 * added this vdev but not yet initialized its metaslabs.
2281 */
2282 if (tvd->vdev_islog && mg != NULL) {
2283 /*
2284 * Prevent any future allocations.
2285 */
2286 metaslab_group_passivate(mg);
2287 (void) spa_vdev_state_exit(spa, vd, 0);
2288
2289 error = spa_offline_log(spa);
2290
2291 spa_vdev_state_enter(spa, SCL_ALLOC);
2292
2293 /*
2294 * Check to see if the config has changed.
2295 */
2296 if (error || generation != spa->spa_config_generation) {
2297 metaslab_group_activate(mg);
2298 if (error)
2299 return (spa_vdev_state_exit(spa,
2300 vd, error));
2301 (void) spa_vdev_state_exit(spa, vd, 0);
2302 goto top;
2303 }
2304 ASSERT0(tvd->vdev_stat.vs_alloc);
2305 }
2306
2307 /*
2308 * Offline this device and reopen its top-level vdev.
2309 * If the top-level vdev is a log device then just offline
2310 * it. Otherwise, if this action results in the top-level
2311 * vdev becoming unusable, undo it and fail the request.
2312 */
2313 vd->vdev_offline = B_TRUE;
2314 vdev_reopen(tvd);
2315
2316 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2317 vdev_is_dead(tvd)) {
2318 vd->vdev_offline = B_FALSE;
2319 vdev_reopen(tvd);
2320 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2321 }
2322
2323 /*
2324 * Add the device back into the metaslab rotor so that
2325 * once we online the device it's open for business.
2326 */
2327 if (tvd->vdev_islog && mg != NULL)
2328 metaslab_group_activate(mg);
2329 }
2330
2331 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY);
2332
2333 return (spa_vdev_state_exit(spa, vd, 0));
2334 }
2335
2336 int
2337 vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags)
2338 {
2339 int error;
2340
2341 mutex_enter(&spa->spa_vdev_top_lock);
2342 error = vdev_offline_locked(spa, guid, flags);
2343 mutex_exit(&spa->spa_vdev_top_lock);
2344
2345 return (error);
2346 }
2347
2348 /*
2349 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2350 * vdev_offline(), we assume the spa config is locked. We also clear all
2351 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2352 */
2353 void
2354 vdev_clear(spa_t *spa, vdev_t *vd)
2355 {
2356 vdev_t *rvd = spa->spa_root_vdev;
2357
2358 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
2359
2360 if (vd == NULL)
2361 vd = rvd;
2362
2363 vd->vdev_stat.vs_read_errors = 0;
2364 vd->vdev_stat.vs_write_errors = 0;
2365 vd->vdev_stat.vs_checksum_errors = 0;
2366
2367 for (int c = 0; c < vd->vdev_children; c++)
2368 vdev_clear(spa, vd->vdev_child[c]);
2369
2370 /*
2371 * If we're in the FAULTED state or have experienced failed I/O, then
2372 * clear the persistent state and attempt to reopen the device. We
2373 * also mark the vdev config dirty, so that the new faulted state is
2374 * written out to disk.
2375 */
2376 if (vd->vdev_faulted || vd->vdev_degraded ||
2377 !vdev_readable(vd) || !vdev_writeable(vd)) {
2378
2379 /*
2380 * When reopening in reponse to a clear event, it may be due to
2381 * a fmadm repair request. In this case, if the device is
2382 * still broken, we want to still post the ereport again.
2383 */
2384 vd->vdev_forcefault = B_TRUE;
2385
2386 vd->vdev_faulted = vd->vdev_degraded = 0ULL;
2387 vd->vdev_cant_read = B_FALSE;
2388 vd->vdev_cant_write = B_FALSE;
2389
2390 vdev_reopen(vd == rvd ? rvd : vd->vdev_top);
2391
2392 vd->vdev_forcefault = B_FALSE;
2393
2394 if (vd != rvd && vdev_writeable(vd->vdev_top))
2395 vdev_state_dirty(vd->vdev_top);
2396
2397 if (vd->vdev_aux == NULL && !vdev_is_dead(vd))
2398 spa_async_request(spa, SPA_ASYNC_RESILVER);
2399
2400 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR);
2401 }
2402
2403 /*
2404 * When clearing a FMA-diagnosed fault, we always want to
2405 * unspare the device, as we assume that the original spare was
2406 * done in response to the FMA fault.
2407 */
2408 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL &&
2409 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2410 vd->vdev_parent->vdev_child[0] == vd)
2411 vd->vdev_unspare = B_TRUE;
2412 }
2413
2414 boolean_t
2415 vdev_is_dead(vdev_t *vd)
2416 {
2417 /*
2418 * Holes and missing devices are always considered "dead".
2419 * This simplifies the code since we don't have to check for
2420 * these types of devices in the various code paths.
2421 * Instead we rely on the fact that we skip over dead devices
2422 * before issuing I/O to them.
2423 */
2424 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole ||
2425 vd->vdev_ops == &vdev_missing_ops);
2426 }
2427
2428 boolean_t
2429 vdev_readable(vdev_t *vd)
2430 {
2431 return (!vdev_is_dead(vd) && !vd->vdev_cant_read);
2432 }
2433
2434 boolean_t
2435 vdev_writeable(vdev_t *vd)
2436 {
2437 return (!vdev_is_dead(vd) && !vd->vdev_cant_write);
2438 }
2439
2440 boolean_t
2441 vdev_allocatable(vdev_t *vd)
2442 {
2443 uint64_t state = vd->vdev_state;
2444
2445 /*
2446 * We currently allow allocations from vdevs which may be in the
2447 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2448 * fails to reopen then we'll catch it later when we're holding
2449 * the proper locks. Note that we have to get the vdev state
2450 * in a local variable because although it changes atomically,
2451 * we're asking two separate questions about it.
2452 */
2453 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) &&
2454 !vd->vdev_cant_write && !vd->vdev_ishole);
2455 }
2456
2457 boolean_t
2458 vdev_accessible(vdev_t *vd, zio_t *zio)
2459 {
2460 ASSERT(zio->io_vd == vd);
2461
2462 if (vdev_is_dead(vd) || vd->vdev_remove_wanted)
2463 return (B_FALSE);
2464
2465 if (zio->io_type == ZIO_TYPE_READ)
2466 return (!vd->vdev_cant_read);
2467
2468 if (zio->io_type == ZIO_TYPE_WRITE)
2469 return (!vd->vdev_cant_write);
2470
2471 return (B_TRUE);
2472 }
2473
2474 /*
2475 * Get statistics for the given vdev.
2476 */
2477 void
2478 vdev_get_stats(vdev_t *vd, vdev_stat_t *vs)
2479 {
2480 vdev_t *rvd = vd->vdev_spa->spa_root_vdev;
2481
2482 mutex_enter(&vd->vdev_stat_lock);
2483 bcopy(&vd->vdev_stat, vs, sizeof (*vs));
2484 vs->vs_timestamp = gethrtime() - vs->vs_timestamp;
2485 vs->vs_state = vd->vdev_state;
2486 vs->vs_rsize = vdev_get_min_asize(vd);
2487 if (vd->vdev_ops->vdev_op_leaf)
2488 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE;
2489 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize;
2490 mutex_exit(&vd->vdev_stat_lock);
2491
2492 /*
2493 * If we're getting stats on the root vdev, aggregate the I/O counts
2494 * over all top-level vdevs (i.e. the direct children of the root).
2495 */
2496 if (vd == rvd) {
2497 for (int c = 0; c < rvd->vdev_children; c++) {
2498 vdev_t *cvd = rvd->vdev_child[c];
2499 vdev_stat_t *cvs = &cvd->vdev_stat;
2500
2501 mutex_enter(&vd->vdev_stat_lock);
2502 for (int t = 0; t < ZIO_TYPES; t++) {
2503 vs->vs_ops[t] += cvs->vs_ops[t];
2504 vs->vs_bytes[t] += cvs->vs_bytes[t];
2505 }
2506 cvs->vs_scan_removing = cvd->vdev_removing;
2507 mutex_exit(&vd->vdev_stat_lock);
2508 }
2509 }
2510 }
2511
2512 void
2513 vdev_clear_stats(vdev_t *vd)
2514 {
2515 mutex_enter(&vd->vdev_stat_lock);
2516 vd->vdev_stat.vs_space = 0;
2517 vd->vdev_stat.vs_dspace = 0;
2518 vd->vdev_stat.vs_alloc = 0;
2519 mutex_exit(&vd->vdev_stat_lock);
2520 }
2521
2522 void
2523 vdev_scan_stat_init(vdev_t *vd)
2524 {
2525 vdev_stat_t *vs = &vd->vdev_stat;
2526
2527 for (int c = 0; c < vd->vdev_children; c++)
2528 vdev_scan_stat_init(vd->vdev_child[c]);
2529
2530 mutex_enter(&vd->vdev_stat_lock);
2531 vs->vs_scan_processed = 0;
2532 mutex_exit(&vd->vdev_stat_lock);
2533 }
2534
2535 void
2536 vdev_stat_update(zio_t *zio, uint64_t psize)
2537 {
2538 spa_t *spa = zio->io_spa;
2539 vdev_t *rvd = spa->spa_root_vdev;
2540 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd;
2541 vdev_t *pvd;
2542 uint64_t txg = zio->io_txg;
2543 vdev_stat_t *vs = &vd->vdev_stat;
2544 zio_type_t type = zio->io_type;
2545 int flags = zio->io_flags;
2546
2547 /*
2548 * If this i/o is a gang leader, it didn't do any actual work.
2549 */
2550 if (zio->io_gang_tree)
2551 return;
2552
2553 if (zio->io_error == 0) {
2554 /*
2555 * If this is a root i/o, don't count it -- we've already
2556 * counted the top-level vdevs, and vdev_get_stats() will
2557 * aggregate them when asked. This reduces contention on
2558 * the root vdev_stat_lock and implicitly handles blocks
2559 * that compress away to holes, for which there is no i/o.
2560 * (Holes never create vdev children, so all the counters
2561 * remain zero, which is what we want.)
2562 *
2563 * Note: this only applies to successful i/o (io_error == 0)
2564 * because unlike i/o counts, errors are not additive.
2565 * When reading a ditto block, for example, failure of
2566 * one top-level vdev does not imply a root-level error.
2567 */
2568 if (vd == rvd)
2569 return;
2570
2571 ASSERT(vd == zio->io_vd);
2572
2573 if (flags & ZIO_FLAG_IO_BYPASS)
2574 return;
2575
2576 mutex_enter(&vd->vdev_stat_lock);
2577
2578 if (flags & ZIO_FLAG_IO_REPAIR) {
2579 if (flags & ZIO_FLAG_SCAN_THREAD) {
2580 dsl_scan_phys_t *scn_phys =
2581 &spa->spa_dsl_pool->dp_scan->scn_phys;
2582 uint64_t *processed = &scn_phys->scn_processed;
2583
2584 /* XXX cleanup? */
2585 if (vd->vdev_ops->vdev_op_leaf)
2586 atomic_add_64(processed, psize);
2587 vs->vs_scan_processed += psize;
2588 }
2589
2590 if (flags & ZIO_FLAG_SELF_HEAL)
2591 vs->vs_self_healed += psize;
2592 }
2593
2594 vs->vs_ops[type]++;
2595 vs->vs_bytes[type] += psize;
2596
2597 mutex_exit(&vd->vdev_stat_lock);
2598 return;
2599 }
2600
2601 if (flags & ZIO_FLAG_SPECULATIVE)
2602 return;
2603
2604 /*
2605 * If this is an I/O error that is going to be retried, then ignore the
2606 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
2607 * hard errors, when in reality they can happen for any number of
2608 * innocuous reasons (bus resets, MPxIO link failure, etc).
2609 */
2610 if (zio->io_error == EIO &&
2611 !(zio->io_flags & ZIO_FLAG_IO_RETRY))
2612 return;
2613
2614 /*
2615 * Intent logs writes won't propagate their error to the root
2616 * I/O so don't mark these types of failures as pool-level
2617 * errors.
2618 */
2619 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
2620 return;
2621
2622 mutex_enter(&vd->vdev_stat_lock);
2623 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) {
2624 if (zio->io_error == ECKSUM)
2625 vs->vs_checksum_errors++;
2626 else
2627 vs->vs_read_errors++;
2628 }
2629 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd))
2630 vs->vs_write_errors++;
2631 mutex_exit(&vd->vdev_stat_lock);
2632
2633 if (type == ZIO_TYPE_WRITE && txg != 0 &&
2634 (!(flags & ZIO_FLAG_IO_REPAIR) ||
2635 (flags & ZIO_FLAG_SCAN_THREAD) ||
2636 spa->spa_claiming)) {
2637 /*
2638 * This is either a normal write (not a repair), or it's
2639 * a repair induced by the scrub thread, or it's a repair
2640 * made by zil_claim() during spa_load() in the first txg.
2641 * In the normal case, we commit the DTL change in the same
2642 * txg as the block was born. In the scrub-induced repair
2643 * case, we know that scrubs run in first-pass syncing context,
2644 * so we commit the DTL change in spa_syncing_txg(spa).
2645 * In the zil_claim() case, we commit in spa_first_txg(spa).
2646 *
2647 * We currently do not make DTL entries for failed spontaneous
2648 * self-healing writes triggered by normal (non-scrubbing)
2649 * reads, because we have no transactional context in which to
2650 * do so -- and it's not clear that it'd be desirable anyway.
2651 */
2652 if (vd->vdev_ops->vdev_op_leaf) {
2653 uint64_t commit_txg = txg;
2654 if (flags & ZIO_FLAG_SCAN_THREAD) {
2655 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
2656 ASSERT(spa_sync_pass(spa) == 1);
2657 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1);
2658 commit_txg = spa_syncing_txg(spa);
2659 } else if (spa->spa_claiming) {
2660 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
2661 commit_txg = spa_first_txg(spa);
2662 }
2663 ASSERT(commit_txg >= spa_syncing_txg(spa));
2664 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1))
2665 return;
2666 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2667 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1);
2668 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg);
2669 }
2670 if (vd != rvd)
2671 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1);
2672 }
2673 }
2674
2675 /*
2676 * Update the in-core space usage stats for this vdev, its metaslab class,
2677 * and the root vdev.
2678 */
2679 void
2680 vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta,
2681 int64_t space_delta)
2682 {
2683 int64_t dspace_delta = space_delta;
2684 spa_t *spa = vd->vdev_spa;
2685 vdev_t *rvd = spa->spa_root_vdev;
2686 metaslab_group_t *mg = vd->vdev_mg;
2687 metaslab_class_t *mc = mg ? mg->mg_class : NULL;
2688
2689 ASSERT(vd == vd->vdev_top);
2690
2691 /*
2692 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2693 * factor. We must calculate this here and not at the root vdev
2694 * because the root vdev's psize-to-asize is simply the max of its
2695 * childrens', thus not accurate enough for us.
2696 */
2697 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0);
2698 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache);
2699 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) *
2700 vd->vdev_deflate_ratio;
2701
2702 mutex_enter(&vd->vdev_stat_lock);
2703 vd->vdev_stat.vs_alloc += alloc_delta;
2704 vd->vdev_stat.vs_space += space_delta;
2705 vd->vdev_stat.vs_dspace += dspace_delta;
2706 mutex_exit(&vd->vdev_stat_lock);
2707
2708 if (mc == spa_normal_class(spa)) {
2709 mutex_enter(&rvd->vdev_stat_lock);
2710 rvd->vdev_stat.vs_alloc += alloc_delta;
2711 rvd->vdev_stat.vs_space += space_delta;
2712 rvd->vdev_stat.vs_dspace += dspace_delta;
2713 mutex_exit(&rvd->vdev_stat_lock);
2714 }
2715
2716 if (mc != NULL) {
2717 ASSERT(rvd == vd->vdev_parent);
2718 ASSERT(vd->vdev_ms_count != 0);
2719
2720 metaslab_class_space_update(mc,
2721 alloc_delta, defer_delta, space_delta, dspace_delta);
2722 }
2723 }
2724
2725 /*
2726 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2727 * so that it will be written out next time the vdev configuration is synced.
2728 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2729 */
2730 void
2731 vdev_config_dirty(vdev_t *vd)
2732 {
2733 spa_t *spa = vd->vdev_spa;
2734 vdev_t *rvd = spa->spa_root_vdev;
2735 int c;
2736
2737 ASSERT(spa_writeable(spa));
2738
2739 /*
2740 * If this is an aux vdev (as with l2cache and spare devices), then we
2741 * update the vdev config manually and set the sync flag.
2742 */
2743 if (vd->vdev_aux != NULL) {
2744 spa_aux_vdev_t *sav = vd->vdev_aux;
2745 nvlist_t **aux;
2746 uint_t naux;
2747
2748 for (c = 0; c < sav->sav_count; c++) {
2749 if (sav->sav_vdevs[c] == vd)
2750 break;
2751 }
2752
2753 if (c == sav->sav_count) {
2754 /*
2755 * We're being removed. There's nothing more to do.
2756 */
2757 ASSERT(sav->sav_sync == B_TRUE);
2758 return;
2759 }
2760
2761 sav->sav_sync = B_TRUE;
2762
2763 if (nvlist_lookup_nvlist_array(sav->sav_config,
2764 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) {
2765 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
2766 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0);
2767 }
2768
2769 ASSERT(c < naux);
2770
2771 /*
2772 * Setting the nvlist in the middle if the array is a little
2773 * sketchy, but it will work.
2774 */
2775 nvlist_free(aux[c]);
2776 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0);
2777
2778 return;
2779 }
2780
2781 /*
2782 * The dirty list is protected by the SCL_CONFIG lock. The caller
2783 * must either hold SCL_CONFIG as writer, or must be the sync thread
2784 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2785 * so this is sufficient to ensure mutual exclusion.
2786 */
2787 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
2788 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2789 spa_config_held(spa, SCL_CONFIG, RW_READER)));
2790
2791 if (vd == rvd) {
2792 for (c = 0; c < rvd->vdev_children; c++)
2793 vdev_config_dirty(rvd->vdev_child[c]);
2794 } else {
2795 ASSERT(vd == vd->vdev_top);
2796
2797 if (!list_link_active(&vd->vdev_config_dirty_node) &&
2798 !vd->vdev_ishole)
2799 list_insert_head(&spa->spa_config_dirty_list, vd);
2800 }
2801 }
2802
2803 void
2804 vdev_config_clean(vdev_t *vd)
2805 {
2806 spa_t *spa = vd->vdev_spa;
2807
2808 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
2809 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2810 spa_config_held(spa, SCL_CONFIG, RW_READER)));
2811
2812 ASSERT(list_link_active(&vd->vdev_config_dirty_node));
2813 list_remove(&spa->spa_config_dirty_list, vd);
2814 }
2815
2816 /*
2817 * Mark a top-level vdev's state as dirty, so that the next pass of
2818 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2819 * the state changes from larger config changes because they require
2820 * much less locking, and are often needed for administrative actions.
2821 */
2822 void
2823 vdev_state_dirty(vdev_t *vd)
2824 {
2825 spa_t *spa = vd->vdev_spa;
2826
2827 ASSERT(spa_writeable(spa));
2828 ASSERT(vd == vd->vdev_top);
2829
2830 /*
2831 * The state list is protected by the SCL_STATE lock. The caller
2832 * must either hold SCL_STATE as writer, or must be the sync thread
2833 * (which holds SCL_STATE as reader). There's only one sync thread,
2834 * so this is sufficient to ensure mutual exclusion.
2835 */
2836 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
2837 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2838 spa_config_held(spa, SCL_STATE, RW_READER)));
2839
2840 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole)
2841 list_insert_head(&spa->spa_state_dirty_list, vd);
2842 }
2843
2844 void
2845 vdev_state_clean(vdev_t *vd)
2846 {
2847 spa_t *spa = vd->vdev_spa;
2848
2849 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
2850 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2851 spa_config_held(spa, SCL_STATE, RW_READER)));
2852
2853 ASSERT(list_link_active(&vd->vdev_state_dirty_node));
2854 list_remove(&spa->spa_state_dirty_list, vd);
2855 }
2856
2857 /*
2858 * Propagate vdev state up from children to parent.
2859 */
2860 void
2861 vdev_propagate_state(vdev_t *vd)
2862 {
2863 spa_t *spa = vd->vdev_spa;
2864 vdev_t *rvd = spa->spa_root_vdev;
2865 int degraded = 0, faulted = 0;
2866 int corrupted = 0;
2867 vdev_t *child;
2868
2869 if (vd->vdev_children > 0) {
2870 for (int c = 0; c < vd->vdev_children; c++) {
2871 child = vd->vdev_child[c];
2872
2873 /*
2874 * Don't factor holes into the decision.
2875 */
2876 if (child->vdev_ishole)
2877 continue;
2878
2879 if (!vdev_readable(child) ||
2880 (!vdev_writeable(child) && spa_writeable(spa))) {
2881 /*
2882 * Root special: if there is a top-level log
2883 * device, treat the root vdev as if it were
2884 * degraded.
2885 */
2886 if (child->vdev_islog && vd == rvd)
2887 degraded++;
2888 else
2889 faulted++;
2890 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) {
2891 degraded++;
2892 }
2893
2894 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA)
2895 corrupted++;
2896 }
2897
2898 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded);
2899
2900 /*
2901 * Root special: if there is a top-level vdev that cannot be
2902 * opened due to corrupted metadata, then propagate the root
2903 * vdev's aux state as 'corrupt' rather than 'insufficient
2904 * replicas'.
2905 */
2906 if (corrupted && vd == rvd &&
2907 rvd->vdev_state == VDEV_STATE_CANT_OPEN)
2908 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN,
2909 VDEV_AUX_CORRUPT_DATA);
2910 }
2911
2912 if (vd->vdev_parent)
2913 vdev_propagate_state(vd->vdev_parent);
2914 }
2915
2916 /*
2917 * Set a vdev's state. If this is during an open, we don't update the parent
2918 * state, because we're in the process of opening children depth-first.
2919 * Otherwise, we propagate the change to the parent.
2920 *
2921 * If this routine places a device in a faulted state, an appropriate ereport is
2922 * generated.
2923 */
2924 void
2925 vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux)
2926 {
2927 uint64_t save_state;
2928 spa_t *spa = vd->vdev_spa;
2929
2930 if (state == vd->vdev_state) {
2931 vd->vdev_stat.vs_aux = aux;
2932 return;
2933 }
2934
2935 save_state = vd->vdev_state;
2936
2937 vd->vdev_state = state;
2938 vd->vdev_stat.vs_aux = aux;
2939
2940 /*
2941 * If we are setting the vdev state to anything but an open state, then
2942 * always close the underlying device unless the device has requested
2943 * a delayed close (i.e. we're about to remove or fault the device).
2944 * Otherwise, we keep accessible but invalid devices open forever.
2945 * We don't call vdev_close() itself, because that implies some extra
2946 * checks (offline, etc) that we don't want here. This is limited to
2947 * leaf devices, because otherwise closing the device will affect other
2948 * children.
2949 */
2950 if (!vd->vdev_delayed_close && vdev_is_dead(vd) &&
2951 vd->vdev_ops->vdev_op_leaf)
2952 vd->vdev_ops->vdev_op_close(vd);
2953
2954 /*
2955 * If we have brought this vdev back into service, we need
2956 * to notify fmd so that it can gracefully repair any outstanding
2957 * cases due to a missing device. We do this in all cases, even those
2958 * that probably don't correlate to a repaired fault. This is sure to
2959 * catch all cases, and we let the zfs-retire agent sort it out. If
2960 * this is a transient state it's OK, as the retire agent will
2961 * double-check the state of the vdev before repairing it.
2962 */
2963 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf &&
2964 vd->vdev_prevstate != state)
2965 zfs_post_state_change(spa, vd);
2966
2967 if (vd->vdev_removed &&
2968 state == VDEV_STATE_CANT_OPEN &&
2969 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) {
2970 /*
2971 * If the previous state is set to VDEV_STATE_REMOVED, then this
2972 * device was previously marked removed and someone attempted to
2973 * reopen it. If this failed due to a nonexistent device, then
2974 * keep the device in the REMOVED state. We also let this be if
2975 * it is one of our special test online cases, which is only
2976 * attempting to online the device and shouldn't generate an FMA
2977 * fault.
2978 */
2979 vd->vdev_state = VDEV_STATE_REMOVED;
2980 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
2981 } else if (state == VDEV_STATE_REMOVED) {
2982 vd->vdev_removed = B_TRUE;
2983 } else if (state == VDEV_STATE_CANT_OPEN) {
2984 /*
2985 * If we fail to open a vdev during an import or recovery, we
2986 * mark it as "not available", which signifies that it was
2987 * never there to begin with. Failure to open such a device
2988 * is not considered an error.
2989 */
2990 if ((spa_load_state(spa) == SPA_LOAD_IMPORT ||
2991 spa_load_state(spa) == SPA_LOAD_RECOVER) &&
2992 vd->vdev_ops->vdev_op_leaf)
2993 vd->vdev_not_present = 1;
2994
2995 /*
2996 * Post the appropriate ereport. If the 'prevstate' field is
2997 * set to something other than VDEV_STATE_UNKNOWN, it indicates
2998 * that this is part of a vdev_reopen(). In this case, we don't
2999 * want to post the ereport if the device was already in the
3000 * CANT_OPEN state beforehand.
3001 *
3002 * If the 'checkremove' flag is set, then this is an attempt to
3003 * online the device in response to an insertion event. If we
3004 * hit this case, then we have detected an insertion event for a
3005 * faulted or offline device that wasn't in the removed state.
3006 * In this scenario, we don't post an ereport because we are
3007 * about to replace the device, or attempt an online with
3008 * vdev_forcefault, which will generate the fault for us.
3009 */
3010 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) &&
3011 !vd->vdev_not_present && !vd->vdev_checkremove &&
3012 vd != spa->spa_root_vdev) {
3013 const char *class;
3014
3015 switch (aux) {
3016 case VDEV_AUX_OPEN_FAILED:
3017 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED;
3018 break;
3019 case VDEV_AUX_CORRUPT_DATA:
3020 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA;
3021 break;
3022 case VDEV_AUX_NO_REPLICAS:
3023 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS;
3024 break;
3025 case VDEV_AUX_BAD_GUID_SUM:
3026 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM;
3027 break;
3028 case VDEV_AUX_TOO_SMALL:
3029 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL;
3030 break;
3031 case VDEV_AUX_BAD_LABEL:
3032 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL;
3033 break;
3034 default:
3035 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN;
3036 }
3037
3038 zfs_ereport_post(class, spa, vd, NULL, save_state, 0);
3039 }
3040
3041 /* Erase any notion of persistent removed state */
3042 vd->vdev_removed = B_FALSE;
3043 } else {
3044 vd->vdev_removed = B_FALSE;
3045 }
3046
3047 if (!isopen && vd->vdev_parent)
3048 vdev_propagate_state(vd->vdev_parent);
3049 }
3050
3051 /*
3052 * Check the vdev configuration to ensure that it's capable of supporting
3053 * a root pool. Currently, we do not support RAID-Z or partial configuration.
3054 * In addition, only a single top-level vdev is allowed and none of the leaves
3055 * can be wholedisks.
3056 */
3057 boolean_t
3058 vdev_is_bootable(vdev_t *vd)
3059 {
3060 if (!vd->vdev_ops->vdev_op_leaf) {
3061 char *vdev_type = vd->vdev_ops->vdev_op_type;
3062
3063 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 &&
3064 vd->vdev_children > 1) {
3065 return (B_FALSE);
3066 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 ||
3067 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) {
3068 return (B_FALSE);
3069 }
3070 } else if (vd->vdev_wholedisk == 1) {
3071 return (B_FALSE);
3072 }
3073
3074 for (int c = 0; c < vd->vdev_children; c++) {
3075 if (!vdev_is_bootable(vd->vdev_child[c]))
3076 return (B_FALSE);
3077 }
3078 return (B_TRUE);
3079 }
3080
3081 /*
3082 * Load the state from the original vdev tree (ovd) which
3083 * we've retrieved from the MOS config object. If the original
3084 * vdev was offline or faulted then we transfer that state to the
3085 * device in the current vdev tree (nvd).
3086 */
3087 void
3088 vdev_load_log_state(vdev_t *nvd, vdev_t *ovd)
3089 {
3090 spa_t *spa = nvd->vdev_spa;
3091
3092 ASSERT(nvd->vdev_top->vdev_islog);
3093 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
3094 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid);
3095
3096 for (int c = 0; c < nvd->vdev_children; c++)
3097 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]);
3098
3099 if (nvd->vdev_ops->vdev_op_leaf) {
3100 /*
3101 * Restore the persistent vdev state
3102 */
3103 nvd->vdev_offline = ovd->vdev_offline;
3104 nvd->vdev_faulted = ovd->vdev_faulted;
3105 nvd->vdev_degraded = ovd->vdev_degraded;
3106 nvd->vdev_removed = ovd->vdev_removed;
3107 }
3108 }
3109
3110 /*
3111 * Determine if a log device has valid content. If the vdev was
3112 * removed or faulted in the MOS config then we know that
3113 * the content on the log device has already been written to the pool.
3114 */
3115 boolean_t
3116 vdev_log_state_valid(vdev_t *vd)
3117 {
3118 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted &&
3119 !vd->vdev_removed)
3120 return (B_TRUE);
3121
3122 for (int c = 0; c < vd->vdev_children; c++)
3123 if (vdev_log_state_valid(vd->vdev_child[c]))
3124 return (B_TRUE);
3125
3126 return (B_FALSE);
3127 }
3128
3129 /*
3130 * Expand a vdev if possible.
3131 */
3132 void
3133 vdev_expand(vdev_t *vd, uint64_t txg)
3134 {
3135 ASSERT(vd->vdev_top == vd);
3136 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
3137
3138 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) {
3139 VERIFY(vdev_metaslab_init(vd, txg) == 0);
3140 vdev_config_dirty(vd);
3141 }
3142 }
3143
3144 /*
3145 * Split a vdev.
3146 */
3147 void
3148 vdev_split(vdev_t *vd)
3149 {
3150 vdev_t *cvd, *pvd = vd->vdev_parent;
3151
3152 vdev_remove_child(pvd, vd);
3153 vdev_compact_children(pvd);
3154
3155 cvd = pvd->vdev_child[0];
3156 if (pvd->vdev_children == 1) {
3157 vdev_remove_parent(cvd);
3158 cvd->vdev_splitting = B_TRUE;
3159 }
3160 vdev_propagate_state(cvd);
3161 }
3162
3163 void
3164 vdev_deadman(vdev_t *vd)
3165 {
3166 for (int c = 0; c < vd->vdev_children; c++) {
3167 vdev_t *cvd = vd->vdev_child[c];
3168
3169 vdev_deadman(cvd);
3170 }
3171
3172 if (vd->vdev_ops->vdev_op_leaf) {
3173 vdev_queue_t *vq = &vd->vdev_queue;
3174
3175 mutex_enter(&vq->vq_lock);
3176 if (avl_numnodes(&vq->vq_pending_tree) > 0) {
3177 spa_t *spa = vd->vdev_spa;
3178 zio_t *fio;
3179 uint64_t delta;
3180
3181 /*
3182 * Look at the head of all the pending queues,
3183 * if any I/O has been outstanding for longer than
3184 * the spa_deadman_synctime we panic the system.
3185 */
3186 fio = avl_first(&vq->vq_pending_tree);
3187 delta = gethrtime() - fio->io_timestamp;
3188 if (delta > spa_deadman_synctime(spa)) {
3189 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, "
3190 "delta %lluns, last io %lluns",
3191 fio->io_timestamp, delta,
3192 vq->vq_io_complete_ts);
3193 fm_panic("I/O to pool '%s' appears to be "
3194 "hung.", spa_name(spa));
3195 }
3196 }
3197 mutex_exit(&vq->vq_lock);
3198 }
3199 }