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 (c) 2011, 2014 by Delphix. All rights reserved.
25 * Copyright 2015 Nexenta Systems, Inc. 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/space_reftree.h>
40 #include <sys/zio.h>
41 #include <sys/zap.h>
42 #include <sys/fs/zfs.h>
43 #include <sys/arc.h>
44 #include <sys/zil.h>
45 #include <sys/dsl_scan.h>
46
47 /*
48 * Virtual device management.
49 */
50
51 static vdev_ops_t *vdev_ops_table[] = {
52 &vdev_root_ops,
53 &vdev_raidz_ops,
54 &vdev_mirror_ops,
55 &vdev_replacing_ops,
56 &vdev_spare_ops,
57 &vdev_disk_ops,
58 &vdev_file_ops,
59 &vdev_missing_ops,
60 &vdev_hole_ops,
61 NULL
62 };
63
64 /* maximum scrub/resilver I/O queue per leaf vdev */
65 int zfs_scrub_limit = 10;
66
67 /*
68 * When a vdev is added, it will be divided into approximately (but no
69 * more than) this number of metaslabs.
70 */
71 int metaslabs_per_vdev = 200;
72
73 /*
74 * Given a vdev type, return the appropriate ops vector.
75 */
76 static vdev_ops_t *
77 vdev_getops(const char *type)
78 {
79 vdev_ops_t *ops, **opspp;
80
81 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++)
82 if (strcmp(ops->vdev_op_type, type) == 0)
83 break;
84
85 return (ops);
86 }
87
88 /*
89 * Default asize function: return the MAX of psize with the asize of
90 * all children. This is what's used by anything other than RAID-Z.
91 */
92 uint64_t
93 vdev_default_asize(vdev_t *vd, uint64_t psize)
94 {
95 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift);
96 uint64_t csize;
97
98 for (int c = 0; c < vd->vdev_children; c++) {
99 csize = vdev_psize_to_asize(vd->vdev_child[c], psize);
100 asize = MAX(asize, csize);
101 }
102
103 return (asize);
104 }
105
106 /*
107 * Get the minimum allocatable size. We define the allocatable size as
108 * the vdev's asize rounded to the nearest metaslab. This allows us to
109 * replace or attach devices which don't have the same physical size but
110 * can still satisfy the same number of allocations.
111 */
112 uint64_t
113 vdev_get_min_asize(vdev_t *vd)
114 {
115 vdev_t *pvd = vd->vdev_parent;
116
117 /*
118 * If our parent is NULL (inactive spare or cache) or is the root,
119 * just return our own asize.
120 */
121 if (pvd == NULL)
122 return (vd->vdev_asize);
123
124 /*
125 * The top-level vdev just returns the allocatable size rounded
126 * to the nearest metaslab.
127 */
128 if (vd == vd->vdev_top)
129 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift));
130
131 /*
132 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
133 * so each child must provide at least 1/Nth of its asize.
134 */
135 if (pvd->vdev_ops == &vdev_raidz_ops)
136 return (pvd->vdev_min_asize / pvd->vdev_children);
137
138 return (pvd->vdev_min_asize);
139 }
140
141 void
142 vdev_set_min_asize(vdev_t *vd)
143 {
144 vd->vdev_min_asize = vdev_get_min_asize(vd);
145
146 for (int c = 0; c < vd->vdev_children; c++)
147 vdev_set_min_asize(vd->vdev_child[c]);
148 }
149
150 vdev_t *
151 vdev_lookup_top(spa_t *spa, uint64_t vdev)
152 {
153 vdev_t *rvd = spa->spa_root_vdev;
154
155 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
156
157 if (vdev < rvd->vdev_children) {
158 ASSERT(rvd->vdev_child[vdev] != NULL);
159 return (rvd->vdev_child[vdev]);
160 }
161
162 return (NULL);
163 }
164
165 vdev_t *
166 vdev_lookup_by_guid(vdev_t *vd, uint64_t guid)
167 {
168 vdev_t *mvd;
169
170 if (vd->vdev_guid == guid)
171 return (vd);
172
173 for (int c = 0; c < vd->vdev_children; c++)
174 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) !=
175 NULL)
176 return (mvd);
177
178 return (NULL);
179 }
180
181 void
182 vdev_add_child(vdev_t *pvd, vdev_t *cvd)
183 {
184 size_t oldsize, newsize;
185 uint64_t id = cvd->vdev_id;
186 vdev_t **newchild;
187
188 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
189 ASSERT(cvd->vdev_parent == NULL);
190
191 cvd->vdev_parent = pvd;
192
193 if (pvd == NULL)
194 return;
195
196 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL);
197
198 oldsize = pvd->vdev_children * sizeof (vdev_t *);
199 pvd->vdev_children = MAX(pvd->vdev_children, id + 1);
200 newsize = pvd->vdev_children * sizeof (vdev_t *);
201
202 newchild = kmem_zalloc(newsize, KM_SLEEP);
203 if (pvd->vdev_child != NULL) {
204 bcopy(pvd->vdev_child, newchild, oldsize);
205 kmem_free(pvd->vdev_child, oldsize);
206 }
207
208 pvd->vdev_child = newchild;
209 pvd->vdev_child[id] = cvd;
210
211 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd);
212 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL);
213
214 /*
215 * Walk up all ancestors to update guid sum.
216 */
217 for (; pvd != NULL; pvd = pvd->vdev_parent)
218 pvd->vdev_guid_sum += cvd->vdev_guid_sum;
219 }
220
221 void
222 vdev_remove_child(vdev_t *pvd, vdev_t *cvd)
223 {
224 int c;
225 uint_t id = cvd->vdev_id;
226
227 ASSERT(cvd->vdev_parent == pvd);
228
229 if (pvd == NULL)
230 return;
231
232 ASSERT(id < pvd->vdev_children);
233 ASSERT(pvd->vdev_child[id] == cvd);
234
235 pvd->vdev_child[id] = NULL;
236 cvd->vdev_parent = NULL;
237
238 for (c = 0; c < pvd->vdev_children; c++)
239 if (pvd->vdev_child[c])
240 break;
241
242 if (c == pvd->vdev_children) {
243 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *));
244 pvd->vdev_child = NULL;
245 pvd->vdev_children = 0;
246 }
247
248 /*
249 * Walk up all ancestors to update guid sum.
250 */
251 for (; pvd != NULL; pvd = pvd->vdev_parent)
252 pvd->vdev_guid_sum -= cvd->vdev_guid_sum;
253 }
254
255 /*
256 * Remove any holes in the child array.
257 */
258 void
259 vdev_compact_children(vdev_t *pvd)
260 {
261 vdev_t **newchild, *cvd;
262 int oldc = pvd->vdev_children;
263 int newc;
264
265 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
266
267 for (int c = newc = 0; c < oldc; c++)
268 if (pvd->vdev_child[c])
269 newc++;
270
271 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP);
272
273 for (int c = newc = 0; c < oldc; c++) {
274 if ((cvd = pvd->vdev_child[c]) != NULL) {
275 newchild[newc] = cvd;
276 cvd->vdev_id = newc++;
277 }
278 }
279
280 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *));
281 pvd->vdev_child = newchild;
282 pvd->vdev_children = newc;
283 }
284
285 /*
286 * Allocate and minimally initialize a vdev_t.
287 */
288 vdev_t *
289 vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops)
290 {
291 vdev_t *vd;
292
293 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP);
294
295 if (spa->spa_root_vdev == NULL) {
296 ASSERT(ops == &vdev_root_ops);
297 spa->spa_root_vdev = vd;
298 spa->spa_load_guid = spa_generate_guid(NULL);
299 }
300
301 if (guid == 0 && ops != &vdev_hole_ops) {
302 if (spa->spa_root_vdev == vd) {
303 /*
304 * The root vdev's guid will also be the pool guid,
305 * which must be unique among all pools.
306 */
307 guid = spa_generate_guid(NULL);
308 } else {
309 /*
310 * Any other vdev's guid must be unique within the pool.
311 */
312 guid = spa_generate_guid(spa);
313 }
314 ASSERT(!spa_guid_exists(spa_guid(spa), guid));
315 }
316
317 vd->vdev_spa = spa;
318 vd->vdev_id = id;
319 vd->vdev_guid = guid;
320 vd->vdev_guid_sum = guid;
321 vd->vdev_ops = ops;
322 vd->vdev_state = VDEV_STATE_CLOSED;
323 vd->vdev_ishole = (ops == &vdev_hole_ops);
324
325 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL);
326 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL);
327 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL);
328 for (int t = 0; t < DTL_TYPES; t++) {
329 vd->vdev_dtl[t] = range_tree_create(NULL, NULL,
330 &vd->vdev_dtl_lock);
331 }
332 txg_list_create(&vd->vdev_ms_list,
333 offsetof(struct metaslab, ms_txg_node));
334 txg_list_create(&vd->vdev_dtl_list,
335 offsetof(struct vdev, vdev_dtl_node));
336 vd->vdev_stat.vs_timestamp = gethrtime();
337 vdev_queue_init(vd);
338 vdev_cache_init(vd);
339
340 return (vd);
341 }
342
343 /*
344 * Allocate a new vdev. The 'alloctype' is used to control whether we are
345 * creating a new vdev or loading an existing one - the behavior is slightly
346 * different for each case.
347 */
348 int
349 vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id,
350 int alloctype)
351 {
352 vdev_ops_t *ops;
353 char *type;
354 uint64_t guid = 0, islog, nparity;
355 vdev_t *vd;
356
357 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
358
359 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
360 return (SET_ERROR(EINVAL));
361
362 if ((ops = vdev_getops(type)) == NULL)
363 return (SET_ERROR(EINVAL));
364
365 /*
366 * If this is a load, get the vdev guid from the nvlist.
367 * Otherwise, vdev_alloc_common() will generate one for us.
368 */
369 if (alloctype == VDEV_ALLOC_LOAD) {
370 uint64_t label_id;
371
372 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) ||
373 label_id != id)
374 return (SET_ERROR(EINVAL));
375
376 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
377 return (SET_ERROR(EINVAL));
378 } else if (alloctype == VDEV_ALLOC_SPARE) {
379 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
380 return (SET_ERROR(EINVAL));
381 } else if (alloctype == VDEV_ALLOC_L2CACHE) {
382 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
383 return (SET_ERROR(EINVAL));
384 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) {
385 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0)
386 return (SET_ERROR(EINVAL));
387 }
388
389 /*
390 * The first allocated vdev must be of type 'root'.
391 */
392 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL)
393 return (SET_ERROR(EINVAL));
394
395 /*
396 * Determine whether we're a log vdev.
397 */
398 islog = 0;
399 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog);
400 if (islog && spa_version(spa) < SPA_VERSION_SLOGS)
401 return (SET_ERROR(ENOTSUP));
402
403 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES)
404 return (SET_ERROR(ENOTSUP));
405
406 /*
407 * Set the nparity property for RAID-Z vdevs.
408 */
409 nparity = -1ULL;
410 if (ops == &vdev_raidz_ops) {
411 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY,
412 &nparity) == 0) {
413 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY)
414 return (SET_ERROR(EINVAL));
415 /*
416 * Previous versions could only support 1 or 2 parity
417 * device.
418 */
419 if (nparity > 1 &&
420 spa_version(spa) < SPA_VERSION_RAIDZ2)
421 return (SET_ERROR(ENOTSUP));
422 if (nparity > 2 &&
423 spa_version(spa) < SPA_VERSION_RAIDZ3)
424 return (SET_ERROR(ENOTSUP));
425 } else {
426 /*
427 * We require the parity to be specified for SPAs that
428 * support multiple parity levels.
429 */
430 if (spa_version(spa) >= SPA_VERSION_RAIDZ2)
431 return (SET_ERROR(EINVAL));
432 /*
433 * Otherwise, we default to 1 parity device for RAID-Z.
434 */
435 nparity = 1;
436 }
437 } else {
438 nparity = 0;
439 }
440 ASSERT(nparity != -1ULL);
441
442 vd = vdev_alloc_common(spa, id, guid, ops);
443
444 vd->vdev_islog = islog;
445 vd->vdev_nparity = nparity;
446
447 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0)
448 vd->vdev_path = spa_strdup(vd->vdev_path);
449 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0)
450 vd->vdev_devid = spa_strdup(vd->vdev_devid);
451 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH,
452 &vd->vdev_physpath) == 0)
453 vd->vdev_physpath = spa_strdup(vd->vdev_physpath);
454 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0)
455 vd->vdev_fru = spa_strdup(vd->vdev_fru);
456
457 /*
458 * Set the whole_disk property. If it's not specified, leave the value
459 * as -1.
460 */
461 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK,
462 &vd->vdev_wholedisk) != 0)
463 vd->vdev_wholedisk = -1ULL;
464
465 /*
466 * Look for the 'not present' flag. This will only be set if the device
467 * was not present at the time of import.
468 */
469 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
470 &vd->vdev_not_present);
471
472 /*
473 * Get the alignment requirement.
474 */
475 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift);
476
477 /*
478 * Retrieve the vdev creation time.
479 */
480 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG,
481 &vd->vdev_crtxg);
482
483 /*
484 * If we're a top-level vdev, try to load the allocation parameters.
485 */
486 if (parent && !parent->vdev_parent &&
487 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) {
488 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,
489 &vd->vdev_ms_array);
490 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT,
491 &vd->vdev_ms_shift);
492 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE,
493 &vd->vdev_asize);
494 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING,
495 &vd->vdev_removing);
496 }
497
498 if (parent && !parent->vdev_parent && alloctype != VDEV_ALLOC_ATTACH) {
499 ASSERT(alloctype == VDEV_ALLOC_LOAD ||
500 alloctype == VDEV_ALLOC_ADD ||
501 alloctype == VDEV_ALLOC_SPLIT ||
502 alloctype == VDEV_ALLOC_ROOTPOOL);
503 vd->vdev_mg = metaslab_group_create(islog ?
504 spa_log_class(spa) : spa_normal_class(spa), vd);
505 }
506
507 /*
508 * If we're a leaf vdev, try to load the DTL object and other state.
509 */
510 if (vd->vdev_ops->vdev_op_leaf &&
511 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE ||
512 alloctype == VDEV_ALLOC_ROOTPOOL)) {
513 if (alloctype == VDEV_ALLOC_LOAD) {
514 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL,
515 &vd->vdev_dtl_object);
516 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE,
517 &vd->vdev_unspare);
518 }
519
520 if (alloctype == VDEV_ALLOC_ROOTPOOL) {
521 uint64_t spare = 0;
522
523 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE,
524 &spare) == 0 && spare)
525 spa_spare_add(vd);
526 }
527
528 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE,
529 &vd->vdev_offline);
530
531 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG,
532 &vd->vdev_resilver_txg);
533
534 /*
535 * When importing a pool, we want to ignore the persistent fault
536 * state, as the diagnosis made on another system may not be
537 * valid in the current context. Local vdevs will
538 * remain in the faulted state.
539 */
540 if (spa_load_state(spa) == SPA_LOAD_OPEN) {
541 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED,
542 &vd->vdev_faulted);
543 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED,
544 &vd->vdev_degraded);
545 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED,
546 &vd->vdev_removed);
547
548 if (vd->vdev_faulted || vd->vdev_degraded) {
549 char *aux;
550
551 vd->vdev_label_aux =
552 VDEV_AUX_ERR_EXCEEDED;
553 if (nvlist_lookup_string(nv,
554 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 &&
555 strcmp(aux, "external") == 0)
556 vd->vdev_label_aux = VDEV_AUX_EXTERNAL;
557 }
558 }
559 }
560
561 /*
562 * Add ourselves to the parent's list of children.
563 */
564 vdev_add_child(parent, vd);
565
566 *vdp = vd;
567
568 return (0);
569 }
570
571 void
572 vdev_free(vdev_t *vd)
573 {
574 spa_t *spa = vd->vdev_spa;
575
576 /*
577 * vdev_free() implies closing the vdev first. This is simpler than
578 * trying to ensure complicated semantics for all callers.
579 */
580 vdev_close(vd);
581
582 ASSERT(!list_link_active(&vd->vdev_config_dirty_node));
583 ASSERT(!list_link_active(&vd->vdev_state_dirty_node));
584
585 /*
586 * Free all children.
587 */
588 for (int c = 0; c < vd->vdev_children; c++)
589 vdev_free(vd->vdev_child[c]);
590
591 ASSERT(vd->vdev_child == NULL);
592 ASSERT(vd->vdev_guid_sum == vd->vdev_guid);
593
594 /*
595 * Discard allocation state.
596 */
597 if (vd->vdev_mg != NULL) {
598 vdev_metaslab_fini(vd);
599 metaslab_group_destroy(vd->vdev_mg);
600 }
601
602 ASSERT0(vd->vdev_stat.vs_space);
603 ASSERT0(vd->vdev_stat.vs_dspace);
604 ASSERT0(vd->vdev_stat.vs_alloc);
605
606 /*
607 * Remove this vdev from its parent's child list.
608 */
609 vdev_remove_child(vd->vdev_parent, vd);
610
611 ASSERT(vd->vdev_parent == NULL);
612
613 /*
614 * Clean up vdev structure.
615 */
616 vdev_queue_fini(vd);
617 vdev_cache_fini(vd);
618
619 if (vd->vdev_path)
620 spa_strfree(vd->vdev_path);
621 if (vd->vdev_devid)
622 spa_strfree(vd->vdev_devid);
623 if (vd->vdev_physpath)
624 spa_strfree(vd->vdev_physpath);
625 if (vd->vdev_fru)
626 spa_strfree(vd->vdev_fru);
627
628 if (vd->vdev_isspare)
629 spa_spare_remove(vd);
630 if (vd->vdev_isl2cache)
631 spa_l2cache_remove(vd);
632
633 txg_list_destroy(&vd->vdev_ms_list);
634 txg_list_destroy(&vd->vdev_dtl_list);
635
636 mutex_enter(&vd->vdev_dtl_lock);
637 space_map_close(vd->vdev_dtl_sm);
638 for (int t = 0; t < DTL_TYPES; t++) {
639 range_tree_vacate(vd->vdev_dtl[t], NULL, NULL);
640 range_tree_destroy(vd->vdev_dtl[t]);
641 }
642 mutex_exit(&vd->vdev_dtl_lock);
643
644 mutex_destroy(&vd->vdev_dtl_lock);
645 mutex_destroy(&vd->vdev_stat_lock);
646 mutex_destroy(&vd->vdev_probe_lock);
647
648 if (vd == spa->spa_root_vdev)
649 spa->spa_root_vdev = NULL;
650
651 kmem_free(vd, sizeof (vdev_t));
652 }
653
654 /*
655 * Transfer top-level vdev state from svd to tvd.
656 */
657 static void
658 vdev_top_transfer(vdev_t *svd, vdev_t *tvd)
659 {
660 spa_t *spa = svd->vdev_spa;
661 metaslab_t *msp;
662 vdev_t *vd;
663 int t;
664
665 ASSERT(tvd == tvd->vdev_top);
666
667 tvd->vdev_ms_array = svd->vdev_ms_array;
668 tvd->vdev_ms_shift = svd->vdev_ms_shift;
669 tvd->vdev_ms_count = svd->vdev_ms_count;
670
671 svd->vdev_ms_array = 0;
672 svd->vdev_ms_shift = 0;
673 svd->vdev_ms_count = 0;
674
675 if (tvd->vdev_mg)
676 ASSERT3P(tvd->vdev_mg, ==, svd->vdev_mg);
677 tvd->vdev_mg = svd->vdev_mg;
678 tvd->vdev_ms = svd->vdev_ms;
679
680 svd->vdev_mg = NULL;
681 svd->vdev_ms = NULL;
682
683 if (tvd->vdev_mg != NULL)
684 tvd->vdev_mg->mg_vd = tvd;
685
686 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc;
687 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space;
688 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace;
689
690 svd->vdev_stat.vs_alloc = 0;
691 svd->vdev_stat.vs_space = 0;
692 svd->vdev_stat.vs_dspace = 0;
693
694 for (t = 0; t < TXG_SIZE; t++) {
695 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL)
696 (void) txg_list_add(&tvd->vdev_ms_list, msp, t);
697 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL)
698 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t);
699 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t))
700 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t);
701 }
702
703 if (list_link_active(&svd->vdev_config_dirty_node)) {
704 vdev_config_clean(svd);
705 vdev_config_dirty(tvd);
706 }
707
708 if (list_link_active(&svd->vdev_state_dirty_node)) {
709 vdev_state_clean(svd);
710 vdev_state_dirty(tvd);
711 }
712
713 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio;
714 svd->vdev_deflate_ratio = 0;
715
716 tvd->vdev_islog = svd->vdev_islog;
717 svd->vdev_islog = 0;
718 }
719
720 static void
721 vdev_top_update(vdev_t *tvd, vdev_t *vd)
722 {
723 if (vd == NULL)
724 return;
725
726 vd->vdev_top = tvd;
727
728 for (int c = 0; c < vd->vdev_children; c++)
729 vdev_top_update(tvd, vd->vdev_child[c]);
730 }
731
732 /*
733 * Add a mirror/replacing vdev above an existing vdev.
734 */
735 vdev_t *
736 vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops)
737 {
738 spa_t *spa = cvd->vdev_spa;
739 vdev_t *pvd = cvd->vdev_parent;
740 vdev_t *mvd;
741
742 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
743
744 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops);
745
746 mvd->vdev_asize = cvd->vdev_asize;
747 mvd->vdev_min_asize = cvd->vdev_min_asize;
748 mvd->vdev_max_asize = cvd->vdev_max_asize;
749 mvd->vdev_ashift = cvd->vdev_ashift;
750 mvd->vdev_state = cvd->vdev_state;
751 mvd->vdev_crtxg = cvd->vdev_crtxg;
752
753 vdev_remove_child(pvd, cvd);
754 vdev_add_child(pvd, mvd);
755 cvd->vdev_id = mvd->vdev_children;
756 vdev_add_child(mvd, cvd);
757 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
758
759 if (mvd == mvd->vdev_top)
760 vdev_top_transfer(cvd, mvd);
761
762 return (mvd);
763 }
764
765 /*
766 * Remove a 1-way mirror/replacing vdev from the tree.
767 */
768 void
769 vdev_remove_parent(vdev_t *cvd)
770 {
771 vdev_t *mvd = cvd->vdev_parent;
772 vdev_t *pvd = mvd->vdev_parent;
773
774 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
775
776 ASSERT(mvd->vdev_children == 1);
777 ASSERT(mvd->vdev_ops == &vdev_mirror_ops ||
778 mvd->vdev_ops == &vdev_replacing_ops ||
779 mvd->vdev_ops == &vdev_spare_ops);
780 cvd->vdev_ashift = mvd->vdev_ashift;
781
782 vdev_remove_child(mvd, cvd);
783 vdev_remove_child(pvd, mvd);
784
785 /*
786 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
787 * Otherwise, we could have detached an offline device, and when we
788 * go to import the pool we'll think we have two top-level vdevs,
789 * instead of a different version of the same top-level vdev.
790 */
791 if (mvd->vdev_top == mvd) {
792 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid;
793 cvd->vdev_orig_guid = cvd->vdev_guid;
794 cvd->vdev_guid += guid_delta;
795 cvd->vdev_guid_sum += guid_delta;
796 }
797 cvd->vdev_id = mvd->vdev_id;
798 vdev_add_child(pvd, cvd);
799 vdev_top_update(cvd->vdev_top, cvd->vdev_top);
800
801 if (cvd == cvd->vdev_top)
802 vdev_top_transfer(mvd, cvd);
803
804 ASSERT(mvd->vdev_children == 0);
805 vdev_free(mvd);
806 }
807
808 int
809 vdev_metaslab_init(vdev_t *vd, uint64_t txg)
810 {
811 spa_t *spa = vd->vdev_spa;
812 objset_t *mos = spa->spa_meta_objset;
813 uint64_t m;
814 uint64_t oldc = vd->vdev_ms_count;
815 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift;
816 metaslab_t **mspp;
817 int error;
818
819 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER));
820
821 /*
822 * This vdev is not being allocated from yet or is a hole.
823 */
824 if (vd->vdev_ms_shift == 0)
825 return (0);
826
827 ASSERT(!vd->vdev_ishole);
828
829 /*
830 * Compute the raidz-deflation ratio. Note, we hard-code
831 * in 128k (1 << 17) because it is the "typical" blocksize.
832 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change,
833 * otherwise it would inconsistently account for existing bp's.
834 */
835 vd->vdev_deflate_ratio = (1 << 17) /
836 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT);
837
838 ASSERT(oldc <= newc);
839
840 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP);
841
842 if (oldc != 0) {
843 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp));
844 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp));
845 }
846
847 vd->vdev_ms = mspp;
848 vd->vdev_ms_count = newc;
849
850 for (m = oldc; m < newc; m++) {
851 uint64_t object = 0;
852
853 if (txg == 0) {
854 error = dmu_read(mos, vd->vdev_ms_array,
855 m * sizeof (uint64_t), sizeof (uint64_t), &object,
856 DMU_READ_PREFETCH);
857 if (error)
858 return (error);
859 }
860
861 error = metaslab_init(vd->vdev_mg, m, object, txg,
862 &(vd->vdev_ms[m]));
863 if (error)
864 return (error);
865 }
866
867 if (txg == 0)
868 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER);
869
870 /*
871 * If the vdev is being removed we don't activate
872 * the metaslabs since we want to ensure that no new
873 * allocations are performed on this device.
874 */
875 if (oldc == 0 && !vd->vdev_removing)
876 metaslab_group_activate(vd->vdev_mg);
877
878 if (txg == 0)
879 spa_config_exit(spa, SCL_ALLOC, FTAG);
880
881 return (0);
882 }
883
884 void
885 vdev_metaslab_fini(vdev_t *vd)
886 {
887 uint64_t m;
888 uint64_t count = vd->vdev_ms_count;
889
890 if (vd->vdev_ms != NULL) {
891 metaslab_group_passivate(vd->vdev_mg);
892 for (m = 0; m < count; m++) {
893 metaslab_t *msp = vd->vdev_ms[m];
894
895 if (msp != NULL)
896 metaslab_fini(msp);
897 }
898 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *));
899 vd->vdev_ms = NULL;
900 }
901 }
902
903 typedef struct vdev_probe_stats {
904 boolean_t vps_readable;
905 boolean_t vps_writeable;
906 int vps_flags;
907 } vdev_probe_stats_t;
908
909 static void
910 vdev_probe_done(zio_t *zio)
911 {
912 spa_t *spa = zio->io_spa;
913 vdev_t *vd = zio->io_vd;
914 vdev_probe_stats_t *vps = zio->io_private;
915
916 ASSERT(vd->vdev_probe_zio != NULL);
917
918 if (zio->io_type == ZIO_TYPE_READ) {
919 if (zio->io_error == 0)
920 vps->vps_readable = 1;
921 if (zio->io_error == 0 && spa_writeable(spa)) {
922 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd,
923 zio->io_offset, zio->io_size, zio->io_data,
924 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
925 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE));
926 } else {
927 zio_buf_free(zio->io_data, zio->io_size);
928 }
929 } else if (zio->io_type == ZIO_TYPE_WRITE) {
930 if (zio->io_error == 0)
931 vps->vps_writeable = 1;
932 zio_buf_free(zio->io_data, zio->io_size);
933 } else if (zio->io_type == ZIO_TYPE_NULL) {
934 zio_t *pio;
935
936 vd->vdev_cant_read |= !vps->vps_readable;
937 vd->vdev_cant_write |= !vps->vps_writeable;
938
939 if (vdev_readable(vd) &&
940 (vdev_writeable(vd) || !spa_writeable(spa))) {
941 zio->io_error = 0;
942 } else {
943 ASSERT(zio->io_error != 0);
944 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE,
945 spa, vd, NULL, 0, 0);
946 zio->io_error = SET_ERROR(ENXIO);
947 }
948
949 mutex_enter(&vd->vdev_probe_lock);
950 ASSERT(vd->vdev_probe_zio == zio);
951 vd->vdev_probe_zio = NULL;
952 mutex_exit(&vd->vdev_probe_lock);
953
954 while ((pio = zio_walk_parents(zio)) != NULL)
955 if (!vdev_accessible(vd, pio))
956 pio->io_error = SET_ERROR(ENXIO);
957
958 kmem_free(vps, sizeof (*vps));
959 }
960 }
961
962 /*
963 * Determine whether this device is accessible.
964 *
965 * Read and write to several known locations: the pad regions of each
966 * vdev label but the first, which we leave alone in case it contains
967 * a VTOC.
968 */
969 zio_t *
970 vdev_probe(vdev_t *vd, zio_t *zio)
971 {
972 spa_t *spa = vd->vdev_spa;
973 vdev_probe_stats_t *vps = NULL;
974 zio_t *pio;
975
976 ASSERT(vd->vdev_ops->vdev_op_leaf);
977
978 /*
979 * Don't probe the probe.
980 */
981 if (zio && (zio->io_flags & ZIO_FLAG_PROBE))
982 return (NULL);
983
984 /*
985 * To prevent 'probe storms' when a device fails, we create
986 * just one probe i/o at a time. All zios that want to probe
987 * this vdev will become parents of the probe io.
988 */
989 mutex_enter(&vd->vdev_probe_lock);
990
991 if ((pio = vd->vdev_probe_zio) == NULL) {
992 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP);
993
994 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE |
995 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE |
996 ZIO_FLAG_TRYHARD;
997
998 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) {
999 /*
1000 * vdev_cant_read and vdev_cant_write can only
1001 * transition from TRUE to FALSE when we have the
1002 * SCL_ZIO lock as writer; otherwise they can only
1003 * transition from FALSE to TRUE. This ensures that
1004 * any zio looking at these values can assume that
1005 * failures persist for the life of the I/O. That's
1006 * important because when a device has intermittent
1007 * connectivity problems, we want to ensure that
1008 * they're ascribed to the device (ENXIO) and not
1009 * the zio (EIO).
1010 *
1011 * Since we hold SCL_ZIO as writer here, clear both
1012 * values so the probe can reevaluate from first
1013 * principles.
1014 */
1015 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER;
1016 vd->vdev_cant_read = B_FALSE;
1017 vd->vdev_cant_write = B_FALSE;
1018 }
1019
1020 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd,
1021 vdev_probe_done, vps,
1022 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE);
1023
1024 /*
1025 * We can't change the vdev state in this context, so we
1026 * kick off an async task to do it on our behalf.
1027 */
1028 if (zio != NULL) {
1029 vd->vdev_probe_wanted = B_TRUE;
1030 spa_async_request(spa, SPA_ASYNC_PROBE);
1031 }
1032 }
1033
1034 if (zio != NULL)
1035 zio_add_child(zio, pio);
1036
1037 mutex_exit(&vd->vdev_probe_lock);
1038
1039 if (vps == NULL) {
1040 ASSERT(zio != NULL);
1041 return (NULL);
1042 }
1043
1044 for (int l = 1; l < VDEV_LABELS; l++) {
1045 zio_nowait(zio_read_phys(pio, vd,
1046 vdev_label_offset(vd->vdev_psize, l,
1047 offsetof(vdev_label_t, vl_pad2)),
1048 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE),
1049 ZIO_CHECKSUM_OFF, vdev_probe_done, vps,
1050 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE));
1051 }
1052
1053 if (zio == NULL)
1054 return (pio);
1055
1056 zio_nowait(pio);
1057 return (NULL);
1058 }
1059
1060 static void
1061 vdev_open_child(void *arg)
1062 {
1063 vdev_t *vd = arg;
1064
1065 vd->vdev_open_thread = curthread;
1066 vd->vdev_open_error = vdev_open(vd);
1067 vd->vdev_open_thread = NULL;
1068 }
1069
1070 boolean_t
1071 vdev_uses_zvols(vdev_t *vd)
1072 {
1073 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR,
1074 strlen(ZVOL_DIR)) == 0)
1075 return (B_TRUE);
1076 for (int c = 0; c < vd->vdev_children; c++)
1077 if (vdev_uses_zvols(vd->vdev_child[c]))
1078 return (B_TRUE);
1079 return (B_FALSE);
1080 }
1081
1082 void
1083 vdev_open_children(vdev_t *vd)
1084 {
1085 taskq_t *tq;
1086 int children = vd->vdev_children;
1087
1088 /*
1089 * in order to handle pools on top of zvols, do the opens
1090 * in a single thread so that the same thread holds the
1091 * spa_namespace_lock
1092 */
1093 if (vdev_uses_zvols(vd)) {
1094 for (int c = 0; c < children; c++)
1095 vd->vdev_child[c]->vdev_open_error =
1096 vdev_open(vd->vdev_child[c]);
1097 return;
1098 }
1099 tq = taskq_create("vdev_open", children, minclsyspri,
1100 children, children, TASKQ_PREPOPULATE);
1101
1102 for (int c = 0; c < children; c++)
1103 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c],
1104 TQ_SLEEP) != NULL);
1105
1106 taskq_destroy(tq);
1107 }
1108
1109 /*
1110 * Prepare a virtual device for access.
1111 */
1112 int
1113 vdev_open(vdev_t *vd)
1114 {
1115 spa_t *spa = vd->vdev_spa;
1116 int error;
1117 uint64_t osize = 0;
1118 uint64_t max_osize = 0;
1119 uint64_t asize, max_asize, psize;
1120 uint64_t ashift = 0;
1121
1122 ASSERT(vd->vdev_open_thread == curthread ||
1123 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1124 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED ||
1125 vd->vdev_state == VDEV_STATE_CANT_OPEN ||
1126 vd->vdev_state == VDEV_STATE_OFFLINE);
1127
1128 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1129 vd->vdev_cant_read = B_FALSE;
1130 vd->vdev_cant_write = B_FALSE;
1131 vd->vdev_min_asize = vdev_get_min_asize(vd);
1132
1133 /*
1134 * If this vdev is not removed, check its fault status. If it's
1135 * faulted, bail out of the open.
1136 */
1137 if (!vd->vdev_removed && vd->vdev_faulted) {
1138 ASSERT(vd->vdev_children == 0);
1139 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1140 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1141 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1142 vd->vdev_label_aux);
1143 return (SET_ERROR(ENXIO));
1144 } else if (vd->vdev_offline) {
1145 ASSERT(vd->vdev_children == 0);
1146 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE);
1147 return (SET_ERROR(ENXIO));
1148 }
1149
1150 error = vd->vdev_ops->vdev_op_open(vd, &osize, &max_osize, &ashift);
1151
1152 /*
1153 * Reset the vdev_reopening flag so that we actually close
1154 * the vdev on error.
1155 */
1156 vd->vdev_reopening = B_FALSE;
1157 if (zio_injection_enabled && error == 0)
1158 error = zio_handle_device_injection(vd, NULL, ENXIO);
1159
1160 if (error) {
1161 if (vd->vdev_removed &&
1162 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED)
1163 vd->vdev_removed = B_FALSE;
1164
1165 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1166 vd->vdev_stat.vs_aux);
1167 return (error);
1168 }
1169
1170 vd->vdev_removed = B_FALSE;
1171
1172 /*
1173 * Recheck the faulted flag now that we have confirmed that
1174 * the vdev is accessible. If we're faulted, bail.
1175 */
1176 if (vd->vdev_faulted) {
1177 ASSERT(vd->vdev_children == 0);
1178 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED ||
1179 vd->vdev_label_aux == VDEV_AUX_EXTERNAL);
1180 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1181 vd->vdev_label_aux);
1182 return (SET_ERROR(ENXIO));
1183 }
1184
1185 if (vd->vdev_degraded) {
1186 ASSERT(vd->vdev_children == 0);
1187 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1188 VDEV_AUX_ERR_EXCEEDED);
1189 } else {
1190 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0);
1191 }
1192
1193 /*
1194 * For hole or missing vdevs we just return success.
1195 */
1196 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops)
1197 return (0);
1198
1199 for (int c = 0; c < vd->vdev_children; c++) {
1200 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) {
1201 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED,
1202 VDEV_AUX_NONE);
1203 break;
1204 }
1205 }
1206
1207 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t));
1208 max_osize = P2ALIGN(max_osize, (uint64_t)sizeof (vdev_label_t));
1209
1210 if (vd->vdev_children == 0) {
1211 if (osize < SPA_MINDEVSIZE) {
1212 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1213 VDEV_AUX_TOO_SMALL);
1214 return (SET_ERROR(EOVERFLOW));
1215 }
1216 psize = osize;
1217 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE);
1218 max_asize = max_osize - (VDEV_LABEL_START_SIZE +
1219 VDEV_LABEL_END_SIZE);
1220 } else {
1221 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE -
1222 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) {
1223 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1224 VDEV_AUX_TOO_SMALL);
1225 return (SET_ERROR(EOVERFLOW));
1226 }
1227 psize = 0;
1228 asize = osize;
1229 max_asize = max_osize;
1230 }
1231
1232 vd->vdev_psize = psize;
1233
1234 /*
1235 * Make sure the allocatable size hasn't shrunk.
1236 */
1237 if (asize < vd->vdev_min_asize) {
1238 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1239 VDEV_AUX_BAD_LABEL);
1240 return (SET_ERROR(EINVAL));
1241 }
1242
1243 if (vd->vdev_asize == 0) {
1244 /*
1245 * This is the first-ever open, so use the computed values.
1246 * For testing purposes, a higher ashift can be requested.
1247 */
1248 vd->vdev_asize = asize;
1249 vd->vdev_max_asize = max_asize;
1250 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift);
1251 } else {
1252 /*
1253 * Detect if the alignment requirement has increased.
1254 * We don't want to make the pool unavailable, just
1255 * issue a warning instead.
1256 */
1257 if (ashift > vd->vdev_top->vdev_ashift &&
1258 vd->vdev_ops->vdev_op_leaf) {
1259 cmn_err(CE_WARN,
1260 "Disk, '%s', has a block alignment that is "
1261 "larger than the pool's alignment\n",
1262 vd->vdev_path);
1263 }
1264 vd->vdev_max_asize = max_asize;
1265 }
1266
1267 /*
1268 * If all children are healthy and the asize has increased,
1269 * then we've experienced dynamic LUN growth. If automatic
1270 * expansion is enabled then use the additional space.
1271 */
1272 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize &&
1273 (vd->vdev_expanding || spa->spa_autoexpand))
1274 vd->vdev_asize = asize;
1275
1276 vdev_set_min_asize(vd);
1277
1278 /*
1279 * Ensure we can issue some IO before declaring the
1280 * vdev open for business.
1281 */
1282 if (vd->vdev_ops->vdev_op_leaf &&
1283 (error = zio_wait(vdev_probe(vd, NULL))) != 0) {
1284 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED,
1285 VDEV_AUX_ERR_EXCEEDED);
1286 return (error);
1287 }
1288
1289 /*
1290 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1291 * resilver. But don't do this if we are doing a reopen for a scrub,
1292 * since this would just restart the scrub we are already doing.
1293 */
1294 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen &&
1295 vdev_resilver_needed(vd, NULL, NULL))
1296 spa_async_request(spa, SPA_ASYNC_RESILVER);
1297
1298 return (0);
1299 }
1300
1301 /*
1302 * Called once the vdevs are all opened, this routine validates the label
1303 * contents. This needs to be done before vdev_load() so that we don't
1304 * inadvertently do repair I/Os to the wrong device.
1305 *
1306 * If 'strict' is false ignore the spa guid check. This is necessary because
1307 * if the machine crashed during a re-guid the new guid might have been written
1308 * to all of the vdev labels, but not the cached config. The strict check
1309 * will be performed when the pool is opened again using the mos config.
1310 *
1311 * This function will only return failure if one of the vdevs indicates that it
1312 * has since been destroyed or exported. This is only possible if
1313 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1314 * will be updated but the function will return 0.
1315 */
1316 int
1317 vdev_validate(vdev_t *vd, boolean_t strict)
1318 {
1319 spa_t *spa = vd->vdev_spa;
1320 nvlist_t *label;
1321 uint64_t guid = 0, top_guid;
1322 uint64_t state;
1323
1324 for (int c = 0; c < vd->vdev_children; c++)
1325 if (vdev_validate(vd->vdev_child[c], strict) != 0)
1326 return (SET_ERROR(EBADF));
1327
1328 /*
1329 * If the device has already failed, or was marked offline, don't do
1330 * any further validation. Otherwise, label I/O will fail and we will
1331 * overwrite the previous state.
1332 */
1333 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
1334 uint64_t aux_guid = 0;
1335 nvlist_t *nvl;
1336 uint64_t txg = spa_last_synced_txg(spa) != 0 ?
1337 spa_last_synced_txg(spa) : -1ULL;
1338
1339 if ((label = vdev_label_read_config(vd, txg)) == NULL) {
1340 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
1341 VDEV_AUX_BAD_LABEL);
1342 return (0);
1343 }
1344
1345 /*
1346 * Determine if this vdev has been split off into another
1347 * pool. If so, then refuse to open it.
1348 */
1349 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID,
1350 &aux_guid) == 0 && aux_guid == spa_guid(spa)) {
1351 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1352 VDEV_AUX_SPLIT_POOL);
1353 nvlist_free(label);
1354 return (0);
1355 }
1356
1357 if (strict && (nvlist_lookup_uint64(label,
1358 ZPOOL_CONFIG_POOL_GUID, &guid) != 0 ||
1359 guid != spa_guid(spa))) {
1360 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1361 VDEV_AUX_CORRUPT_DATA);
1362 nvlist_free(label);
1363 return (0);
1364 }
1365
1366 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl)
1367 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID,
1368 &aux_guid) != 0)
1369 aux_guid = 0;
1370
1371 /*
1372 * If this vdev just became a top-level vdev because its
1373 * sibling was detached, it will have adopted the parent's
1374 * vdev guid -- but the label may or may not be on disk yet.
1375 * Fortunately, either version of the label will have the
1376 * same top guid, so if we're a top-level vdev, we can
1377 * safely compare to that instead.
1378 *
1379 * If we split this vdev off instead, then we also check the
1380 * original pool's guid. We don't want to consider the vdev
1381 * corrupt if it is partway through a split operation.
1382 */
1383 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID,
1384 &guid) != 0 ||
1385 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID,
1386 &top_guid) != 0 ||
1387 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) &&
1388 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) {
1389 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1390 VDEV_AUX_CORRUPT_DATA);
1391 nvlist_free(label);
1392 return (0);
1393 }
1394
1395 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE,
1396 &state) != 0) {
1397 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
1398 VDEV_AUX_CORRUPT_DATA);
1399 nvlist_free(label);
1400 return (0);
1401 }
1402
1403 nvlist_free(label);
1404
1405 /*
1406 * If this is a verbatim import, no need to check the
1407 * state of the pool.
1408 */
1409 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) &&
1410 spa_load_state(spa) == SPA_LOAD_OPEN &&
1411 state != POOL_STATE_ACTIVE)
1412 return (SET_ERROR(EBADF));
1413
1414 /*
1415 * If we were able to open and validate a vdev that was
1416 * previously marked permanently unavailable, clear that state
1417 * now.
1418 */
1419 if (vd->vdev_not_present)
1420 vd->vdev_not_present = 0;
1421 }
1422
1423 return (0);
1424 }
1425
1426 /*
1427 * Close a virtual device.
1428 */
1429 void
1430 vdev_close(vdev_t *vd)
1431 {
1432 spa_t *spa = vd->vdev_spa;
1433 vdev_t *pvd = vd->vdev_parent;
1434
1435 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1436
1437 /*
1438 * If our parent is reopening, then we are as well, unless we are
1439 * going offline.
1440 */
1441 if (pvd != NULL && pvd->vdev_reopening)
1442 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline);
1443
1444 vd->vdev_ops->vdev_op_close(vd);
1445
1446 vdev_cache_purge(vd);
1447
1448 /*
1449 * We record the previous state before we close it, so that if we are
1450 * doing a reopen(), we don't generate FMA ereports if we notice that
1451 * it's still faulted.
1452 */
1453 vd->vdev_prevstate = vd->vdev_state;
1454
1455 if (vd->vdev_offline)
1456 vd->vdev_state = VDEV_STATE_OFFLINE;
1457 else
1458 vd->vdev_state = VDEV_STATE_CLOSED;
1459 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
1460 }
1461
1462 void
1463 vdev_hold(vdev_t *vd)
1464 {
1465 spa_t *spa = vd->vdev_spa;
1466
1467 ASSERT(spa_is_root(spa));
1468 if (spa->spa_state == POOL_STATE_UNINITIALIZED)
1469 return;
1470
1471 for (int c = 0; c < vd->vdev_children; c++)
1472 vdev_hold(vd->vdev_child[c]);
1473
1474 if (vd->vdev_ops->vdev_op_leaf)
1475 vd->vdev_ops->vdev_op_hold(vd);
1476 }
1477
1478 void
1479 vdev_rele(vdev_t *vd)
1480 {
1481 spa_t *spa = vd->vdev_spa;
1482
1483 ASSERT(spa_is_root(spa));
1484 for (int c = 0; c < vd->vdev_children; c++)
1485 vdev_rele(vd->vdev_child[c]);
1486
1487 if (vd->vdev_ops->vdev_op_leaf)
1488 vd->vdev_ops->vdev_op_rele(vd);
1489 }
1490
1491 /*
1492 * Reopen all interior vdevs and any unopened leaves. We don't actually
1493 * reopen leaf vdevs which had previously been opened as they might deadlock
1494 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1495 * If the leaf has never been opened then open it, as usual.
1496 */
1497 void
1498 vdev_reopen(vdev_t *vd)
1499 {
1500 spa_t *spa = vd->vdev_spa;
1501
1502 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1503
1504 /* set the reopening flag unless we're taking the vdev offline */
1505 vd->vdev_reopening = !vd->vdev_offline;
1506 vdev_close(vd);
1507 (void) vdev_open(vd);
1508
1509 /*
1510 * Call vdev_validate() here to make sure we have the same device.
1511 * Otherwise, a device with an invalid label could be successfully
1512 * opened in response to vdev_reopen().
1513 */
1514 if (vd->vdev_aux) {
1515 (void) vdev_validate_aux(vd);
1516 if (vdev_readable(vd) && vdev_writeable(vd) &&
1517 vd->vdev_aux == &spa->spa_l2cache &&
1518 !l2arc_vdev_present(vd))
1519 l2arc_add_vdev(spa, vd);
1520 } else {
1521 (void) vdev_validate(vd, B_TRUE);
1522 }
1523
1524 /*
1525 * Reassess parent vdev's health.
1526 */
1527 vdev_propagate_state(vd);
1528 }
1529
1530 int
1531 vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing)
1532 {
1533 int error;
1534
1535 /*
1536 * Normally, partial opens (e.g. of a mirror) are allowed.
1537 * For a create, however, we want to fail the request if
1538 * there are any components we can't open.
1539 */
1540 error = vdev_open(vd);
1541
1542 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) {
1543 vdev_close(vd);
1544 return (error ? error : ENXIO);
1545 }
1546
1547 /*
1548 * Recursively load DTLs and initialize all labels.
1549 */
1550 if ((error = vdev_dtl_load(vd)) != 0 ||
1551 (error = vdev_label_init(vd, txg, isreplacing ?
1552 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) {
1553 vdev_close(vd);
1554 return (error);
1555 }
1556
1557 return (0);
1558 }
1559
1560 void
1561 vdev_metaslab_set_size(vdev_t *vd)
1562 {
1563 /*
1564 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
1565 */
1566 vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev);
1567 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
1568 }
1569
1570 void
1571 vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg)
1572 {
1573 ASSERT(vd == vd->vdev_top);
1574 ASSERT(!vd->vdev_ishole);
1575 ASSERT(ISP2(flags));
1576 ASSERT(spa_writeable(vd->vdev_spa));
1577
1578 if (flags & VDD_METASLAB)
1579 (void) txg_list_add(&vd->vdev_ms_list, arg, txg);
1580
1581 if (flags & VDD_DTL)
1582 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg);
1583
1584 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg);
1585 }
1586
1587 void
1588 vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg)
1589 {
1590 for (int c = 0; c < vd->vdev_children; c++)
1591 vdev_dirty_leaves(vd->vdev_child[c], flags, txg);
1592
1593 if (vd->vdev_ops->vdev_op_leaf)
1594 vdev_dirty(vd->vdev_top, flags, vd, txg);
1595 }
1596
1597 /*
1598 * DTLs.
1599 *
1600 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1601 * the vdev has less than perfect replication. There are four kinds of DTL:
1602 *
1603 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1604 *
1605 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1606 *
1607 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1608 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1609 * txgs that was scrubbed.
1610 *
1611 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1612 * persistent errors or just some device being offline.
1613 * Unlike the other three, the DTL_OUTAGE map is not generally
1614 * maintained; it's only computed when needed, typically to
1615 * determine whether a device can be detached.
1616 *
1617 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1618 * either has the data or it doesn't.
1619 *
1620 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1621 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1622 * if any child is less than fully replicated, then so is its parent.
1623 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1624 * comprising only those txgs which appear in 'maxfaults' or more children;
1625 * those are the txgs we don't have enough replication to read. For example,
1626 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1627 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1628 * two child DTL_MISSING maps.
1629 *
1630 * It should be clear from the above that to compute the DTLs and outage maps
1631 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1632 * Therefore, that is all we keep on disk. When loading the pool, or after
1633 * a configuration change, we generate all other DTLs from first principles.
1634 */
1635 void
1636 vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1637 {
1638 range_tree_t *rt = vd->vdev_dtl[t];
1639
1640 ASSERT(t < DTL_TYPES);
1641 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1642 ASSERT(spa_writeable(vd->vdev_spa));
1643
1644 mutex_enter(rt->rt_lock);
1645 if (!range_tree_contains(rt, txg, size))
1646 range_tree_add(rt, txg, size);
1647 mutex_exit(rt->rt_lock);
1648 }
1649
1650 boolean_t
1651 vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size)
1652 {
1653 range_tree_t *rt = vd->vdev_dtl[t];
1654 boolean_t dirty = B_FALSE;
1655
1656 ASSERT(t < DTL_TYPES);
1657 ASSERT(vd != vd->vdev_spa->spa_root_vdev);
1658
1659 mutex_enter(rt->rt_lock);
1660 if (range_tree_space(rt) != 0)
1661 dirty = range_tree_contains(rt, txg, size);
1662 mutex_exit(rt->rt_lock);
1663
1664 return (dirty);
1665 }
1666
1667 boolean_t
1668 vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t)
1669 {
1670 range_tree_t *rt = vd->vdev_dtl[t];
1671 boolean_t empty;
1672
1673 mutex_enter(rt->rt_lock);
1674 empty = (range_tree_space(rt) == 0);
1675 mutex_exit(rt->rt_lock);
1676
1677 return (empty);
1678 }
1679
1680 /*
1681 * Returns the lowest txg in the DTL range.
1682 */
1683 static uint64_t
1684 vdev_dtl_min(vdev_t *vd)
1685 {
1686 range_seg_t *rs;
1687
1688 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
1689 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0);
1690 ASSERT0(vd->vdev_children);
1691
1692 rs = avl_first(&vd->vdev_dtl[DTL_MISSING]->rt_root);
1693 return (rs->rs_start - 1);
1694 }
1695
1696 /*
1697 * Returns the highest txg in the DTL.
1698 */
1699 static uint64_t
1700 vdev_dtl_max(vdev_t *vd)
1701 {
1702 range_seg_t *rs;
1703
1704 ASSERT(MUTEX_HELD(&vd->vdev_dtl_lock));
1705 ASSERT3U(range_tree_space(vd->vdev_dtl[DTL_MISSING]), !=, 0);
1706 ASSERT0(vd->vdev_children);
1707
1708 rs = avl_last(&vd->vdev_dtl[DTL_MISSING]->rt_root);
1709 return (rs->rs_end);
1710 }
1711
1712 /*
1713 * Determine if a resilvering vdev should remove any DTL entries from
1714 * its range. If the vdev was resilvering for the entire duration of the
1715 * scan then it should excise that range from its DTLs. Otherwise, this
1716 * vdev is considered partially resilvered and should leave its DTL
1717 * entries intact. The comment in vdev_dtl_reassess() describes how we
1718 * excise the DTLs.
1719 */
1720 static boolean_t
1721 vdev_dtl_should_excise(vdev_t *vd)
1722 {
1723 spa_t *spa = vd->vdev_spa;
1724 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
1725
1726 ASSERT0(scn->scn_phys.scn_errors);
1727 ASSERT0(vd->vdev_children);
1728
1729 if (vd->vdev_resilver_txg == 0 ||
1730 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0)
1731 return (B_TRUE);
1732
1733 /*
1734 * When a resilver is initiated the scan will assign the scn_max_txg
1735 * value to the highest txg value that exists in all DTLs. If this
1736 * device's max DTL is not part of this scan (i.e. it is not in
1737 * the range (scn_min_txg, scn_max_txg] then it is not eligible
1738 * for excision.
1739 */
1740 if (vdev_dtl_max(vd) <= scn->scn_phys.scn_max_txg) {
1741 ASSERT3U(scn->scn_phys.scn_min_txg, <=, vdev_dtl_min(vd));
1742 ASSERT3U(scn->scn_phys.scn_min_txg, <, vd->vdev_resilver_txg);
1743 ASSERT3U(vd->vdev_resilver_txg, <=, scn->scn_phys.scn_max_txg);
1744 return (B_TRUE);
1745 }
1746 return (B_FALSE);
1747 }
1748
1749 /*
1750 * Reassess DTLs after a config change or scrub completion.
1751 */
1752 void
1753 vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done)
1754 {
1755 spa_t *spa = vd->vdev_spa;
1756 avl_tree_t reftree;
1757 int minref;
1758
1759 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
1760
1761 for (int c = 0; c < vd->vdev_children; c++)
1762 vdev_dtl_reassess(vd->vdev_child[c], txg,
1763 scrub_txg, scrub_done);
1764
1765 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux)
1766 return;
1767
1768 if (vd->vdev_ops->vdev_op_leaf) {
1769 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan;
1770
1771 mutex_enter(&vd->vdev_dtl_lock);
1772
1773 /*
1774 * If we've completed a scan cleanly then determine
1775 * if this vdev should remove any DTLs. We only want to
1776 * excise regions on vdevs that were available during
1777 * the entire duration of this scan.
1778 */
1779 if (scrub_txg != 0 &&
1780 (spa->spa_scrub_started ||
1781 (scn != NULL && scn->scn_phys.scn_errors == 0)) &&
1782 vdev_dtl_should_excise(vd)) {
1783 /*
1784 * We completed a scrub up to scrub_txg. If we
1785 * did it without rebooting, then the scrub dtl
1786 * will be valid, so excise the old region and
1787 * fold in the scrub dtl. Otherwise, leave the
1788 * dtl as-is if there was an error.
1789 *
1790 * There's little trick here: to excise the beginning
1791 * of the DTL_MISSING map, we put it into a reference
1792 * tree and then add a segment with refcnt -1 that
1793 * covers the range [0, scrub_txg). This means
1794 * that each txg in that range has refcnt -1 or 0.
1795 * We then add DTL_SCRUB with a refcnt of 2, so that
1796 * entries in the range [0, scrub_txg) will have a
1797 * positive refcnt -- either 1 or 2. We then convert
1798 * the reference tree into the new DTL_MISSING map.
1799 */
1800 space_reftree_create(&reftree);
1801 space_reftree_add_map(&reftree,
1802 vd->vdev_dtl[DTL_MISSING], 1);
1803 space_reftree_add_seg(&reftree, 0, scrub_txg, -1);
1804 space_reftree_add_map(&reftree,
1805 vd->vdev_dtl[DTL_SCRUB], 2);
1806 space_reftree_generate_map(&reftree,
1807 vd->vdev_dtl[DTL_MISSING], 1);
1808 space_reftree_destroy(&reftree);
1809 }
1810 range_tree_vacate(vd->vdev_dtl[DTL_PARTIAL], NULL, NULL);
1811 range_tree_walk(vd->vdev_dtl[DTL_MISSING],
1812 range_tree_add, vd->vdev_dtl[DTL_PARTIAL]);
1813 if (scrub_done)
1814 range_tree_vacate(vd->vdev_dtl[DTL_SCRUB], NULL, NULL);
1815 range_tree_vacate(vd->vdev_dtl[DTL_OUTAGE], NULL, NULL);
1816 if (!vdev_readable(vd))
1817 range_tree_add(vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL);
1818 else
1819 range_tree_walk(vd->vdev_dtl[DTL_MISSING],
1820 range_tree_add, vd->vdev_dtl[DTL_OUTAGE]);
1821
1822 /*
1823 * If the vdev was resilvering and no longer has any
1824 * DTLs then reset its resilvering flag.
1825 */
1826 if (vd->vdev_resilver_txg != 0 &&
1827 range_tree_space(vd->vdev_dtl[DTL_MISSING]) == 0 &&
1828 range_tree_space(vd->vdev_dtl[DTL_OUTAGE]) == 0)
1829 vd->vdev_resilver_txg = 0;
1830
1831 mutex_exit(&vd->vdev_dtl_lock);
1832
1833 if (txg != 0)
1834 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg);
1835 return;
1836 }
1837
1838 mutex_enter(&vd->vdev_dtl_lock);
1839 for (int t = 0; t < DTL_TYPES; t++) {
1840 /* account for child's outage in parent's missing map */
1841 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t;
1842 if (t == DTL_SCRUB)
1843 continue; /* leaf vdevs only */
1844 if (t == DTL_PARTIAL)
1845 minref = 1; /* i.e. non-zero */
1846 else if (vd->vdev_nparity != 0)
1847 minref = vd->vdev_nparity + 1; /* RAID-Z */
1848 else
1849 minref = vd->vdev_children; /* any kind of mirror */
1850 space_reftree_create(&reftree);
1851 for (int c = 0; c < vd->vdev_children; c++) {
1852 vdev_t *cvd = vd->vdev_child[c];
1853 mutex_enter(&cvd->vdev_dtl_lock);
1854 space_reftree_add_map(&reftree, cvd->vdev_dtl[s], 1);
1855 mutex_exit(&cvd->vdev_dtl_lock);
1856 }
1857 space_reftree_generate_map(&reftree, vd->vdev_dtl[t], minref);
1858 space_reftree_destroy(&reftree);
1859 }
1860 mutex_exit(&vd->vdev_dtl_lock);
1861 }
1862
1863 int
1864 vdev_dtl_load(vdev_t *vd)
1865 {
1866 spa_t *spa = vd->vdev_spa;
1867 objset_t *mos = spa->spa_meta_objset;
1868 int error = 0;
1869
1870 if (vd->vdev_ops->vdev_op_leaf && vd->vdev_dtl_object != 0) {
1871 ASSERT(!vd->vdev_ishole);
1872
1873 error = space_map_open(&vd->vdev_dtl_sm, mos,
1874 vd->vdev_dtl_object, 0, -1ULL, 0, &vd->vdev_dtl_lock);
1875 if (error)
1876 return (error);
1877 ASSERT(vd->vdev_dtl_sm != NULL);
1878
1879 mutex_enter(&vd->vdev_dtl_lock);
1880
1881 /*
1882 * Now that we've opened the space_map we need to update
1883 * the in-core DTL.
1884 */
1885 space_map_update(vd->vdev_dtl_sm);
1886
1887 error = space_map_load(vd->vdev_dtl_sm,
1888 vd->vdev_dtl[DTL_MISSING], SM_ALLOC);
1889 mutex_exit(&vd->vdev_dtl_lock);
1890
1891 return (error);
1892 }
1893
1894 for (int c = 0; c < vd->vdev_children; c++) {
1895 error = vdev_dtl_load(vd->vdev_child[c]);
1896 if (error != 0)
1897 break;
1898 }
1899
1900 return (error);
1901 }
1902
1903 void
1904 vdev_dtl_sync(vdev_t *vd, uint64_t txg)
1905 {
1906 spa_t *spa = vd->vdev_spa;
1907 range_tree_t *rt = vd->vdev_dtl[DTL_MISSING];
1908 objset_t *mos = spa->spa_meta_objset;
1909 range_tree_t *rtsync;
1910 kmutex_t rtlock;
1911 dmu_tx_t *tx;
1912 uint64_t object = space_map_object(vd->vdev_dtl_sm);
1913
1914 ASSERT(!vd->vdev_ishole);
1915 ASSERT(vd->vdev_ops->vdev_op_leaf);
1916
1917 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
1918
1919 if (vd->vdev_detached || vd->vdev_top->vdev_removing) {
1920 mutex_enter(&vd->vdev_dtl_lock);
1921 space_map_free(vd->vdev_dtl_sm, tx);
1922 space_map_close(vd->vdev_dtl_sm);
1923 vd->vdev_dtl_sm = NULL;
1924 mutex_exit(&vd->vdev_dtl_lock);
1925 dmu_tx_commit(tx);
1926 return;
1927 }
1928
1929 if (vd->vdev_dtl_sm == NULL) {
1930 uint64_t new_object;
1931
1932 new_object = space_map_alloc(mos, tx);
1933 VERIFY3U(new_object, !=, 0);
1934
1935 VERIFY0(space_map_open(&vd->vdev_dtl_sm, mos, new_object,
1936 0, -1ULL, 0, &vd->vdev_dtl_lock));
1937 ASSERT(vd->vdev_dtl_sm != NULL);
1938 }
1939
1940 mutex_init(&rtlock, NULL, MUTEX_DEFAULT, NULL);
1941
1942 rtsync = range_tree_create(NULL, NULL, &rtlock);
1943
1944 mutex_enter(&rtlock);
1945
1946 mutex_enter(&vd->vdev_dtl_lock);
1947 range_tree_walk(rt, range_tree_add, rtsync);
1948 mutex_exit(&vd->vdev_dtl_lock);
1949
1950 space_map_truncate(vd->vdev_dtl_sm, tx);
1951 space_map_write(vd->vdev_dtl_sm, rtsync, SM_ALLOC, tx);
1952 range_tree_vacate(rtsync, NULL, NULL);
1953
1954 range_tree_destroy(rtsync);
1955
1956 mutex_exit(&rtlock);
1957 mutex_destroy(&rtlock);
1958
1959 /*
1960 * If the object for the space map has changed then dirty
1961 * the top level so that we update the config.
1962 */
1963 if (object != space_map_object(vd->vdev_dtl_sm)) {
1964 zfs_dbgmsg("txg %llu, spa %s, DTL old object %llu, "
1965 "new object %llu", txg, spa_name(spa), object,
1966 space_map_object(vd->vdev_dtl_sm));
1967 vdev_config_dirty(vd->vdev_top);
1968 }
1969
1970 dmu_tx_commit(tx);
1971
1972 mutex_enter(&vd->vdev_dtl_lock);
1973 space_map_update(vd->vdev_dtl_sm);
1974 mutex_exit(&vd->vdev_dtl_lock);
1975 }
1976
1977 /*
1978 * Determine whether the specified vdev can be offlined/detached/removed
1979 * without losing data.
1980 */
1981 boolean_t
1982 vdev_dtl_required(vdev_t *vd)
1983 {
1984 spa_t *spa = vd->vdev_spa;
1985 vdev_t *tvd = vd->vdev_top;
1986 uint8_t cant_read = vd->vdev_cant_read;
1987 boolean_t required;
1988
1989 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
1990
1991 if (vd == spa->spa_root_vdev || vd == tvd)
1992 return (B_TRUE);
1993
1994 /*
1995 * Temporarily mark the device as unreadable, and then determine
1996 * whether this results in any DTL outages in the top-level vdev.
1997 * If not, we can safely offline/detach/remove the device.
1998 */
1999 vd->vdev_cant_read = B_TRUE;
2000 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
2001 required = !vdev_dtl_empty(tvd, DTL_OUTAGE);
2002 vd->vdev_cant_read = cant_read;
2003 vdev_dtl_reassess(tvd, 0, 0, B_FALSE);
2004
2005 if (!required && zio_injection_enabled)
2006 required = !!zio_handle_device_injection(vd, NULL, ECHILD);
2007
2008 return (required);
2009 }
2010
2011 /*
2012 * Determine if resilver is needed, and if so the txg range.
2013 */
2014 boolean_t
2015 vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp)
2016 {
2017 boolean_t needed = B_FALSE;
2018 uint64_t thismin = UINT64_MAX;
2019 uint64_t thismax = 0;
2020
2021 if (vd->vdev_children == 0) {
2022 mutex_enter(&vd->vdev_dtl_lock);
2023 if (range_tree_space(vd->vdev_dtl[DTL_MISSING]) != 0 &&
2024 vdev_writeable(vd)) {
2025
2026 thismin = vdev_dtl_min(vd);
2027 thismax = vdev_dtl_max(vd);
2028 needed = B_TRUE;
2029 }
2030 mutex_exit(&vd->vdev_dtl_lock);
2031 } else {
2032 for (int c = 0; c < vd->vdev_children; c++) {
2033 vdev_t *cvd = vd->vdev_child[c];
2034 uint64_t cmin, cmax;
2035
2036 if (vdev_resilver_needed(cvd, &cmin, &cmax)) {
2037 thismin = MIN(thismin, cmin);
2038 thismax = MAX(thismax, cmax);
2039 needed = B_TRUE;
2040 }
2041 }
2042 }
2043
2044 if (needed && minp) {
2045 *minp = thismin;
2046 *maxp = thismax;
2047 }
2048 return (needed);
2049 }
2050
2051 void
2052 vdev_load(vdev_t *vd)
2053 {
2054 /*
2055 * Recursively load all children.
2056 */
2057 for (int c = 0; c < vd->vdev_children; c++)
2058 vdev_load(vd->vdev_child[c]);
2059
2060 /*
2061 * If this is a top-level vdev, initialize its metaslabs.
2062 */
2063 if (vd == vd->vdev_top && !vd->vdev_ishole &&
2064 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 ||
2065 vdev_metaslab_init(vd, 0) != 0))
2066 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
2067 VDEV_AUX_CORRUPT_DATA);
2068
2069 /*
2070 * If this is a leaf vdev, load its DTL.
2071 */
2072 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0)
2073 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
2074 VDEV_AUX_CORRUPT_DATA);
2075 }
2076
2077 /*
2078 * The special vdev case is used for hot spares and l2cache devices. Its
2079 * sole purpose it to set the vdev state for the associated vdev. To do this,
2080 * we make sure that we can open the underlying device, then try to read the
2081 * label, and make sure that the label is sane and that it hasn't been
2082 * repurposed to another pool.
2083 */
2084 int
2085 vdev_validate_aux(vdev_t *vd)
2086 {
2087 nvlist_t *label;
2088 uint64_t guid, version;
2089 uint64_t state;
2090
2091 if (!vdev_readable(vd))
2092 return (0);
2093
2094 if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) {
2095 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
2096 VDEV_AUX_CORRUPT_DATA);
2097 return (-1);
2098 }
2099
2100 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 ||
2101 !SPA_VERSION_IS_SUPPORTED(version) ||
2102 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 ||
2103 guid != vd->vdev_guid ||
2104 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) {
2105 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
2106 VDEV_AUX_CORRUPT_DATA);
2107 nvlist_free(label);
2108 return (-1);
2109 }
2110
2111 /*
2112 * We don't actually check the pool state here. If it's in fact in
2113 * use by another pool, we update this fact on the fly when requested.
2114 */
2115 nvlist_free(label);
2116 return (0);
2117 }
2118
2119 void
2120 vdev_remove(vdev_t *vd, uint64_t txg)
2121 {
2122 spa_t *spa = vd->vdev_spa;
2123 objset_t *mos = spa->spa_meta_objset;
2124 dmu_tx_t *tx;
2125
2126 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);
2127
2128 if (vd->vdev_ms != NULL) {
2129 metaslab_group_t *mg = vd->vdev_mg;
2130
2131 metaslab_group_histogram_verify(mg);
2132 metaslab_class_histogram_verify(mg->mg_class);
2133
2134 for (int m = 0; m < vd->vdev_ms_count; m++) {
2135 metaslab_t *msp = vd->vdev_ms[m];
2136
2137 if (msp == NULL || msp->ms_sm == NULL)
2138 continue;
2139
2140 mutex_enter(&msp->ms_lock);
2141 /*
2142 * If the metaslab was not loaded when the vdev
2143 * was removed then the histogram accounting may
2144 * not be accurate. Update the histogram information
2145 * here so that we ensure that the metaslab group
2146 * and metaslab class are up-to-date.
2147 */
2148 metaslab_group_histogram_remove(mg, msp);
2149
2150 VERIFY0(space_map_allocated(msp->ms_sm));
2151 space_map_free(msp->ms_sm, tx);
2152 space_map_close(msp->ms_sm);
2153 msp->ms_sm = NULL;
2154 mutex_exit(&msp->ms_lock);
2155 }
2156
2157 metaslab_group_histogram_verify(mg);
2158 metaslab_class_histogram_verify(mg->mg_class);
2159 for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++)
2160 ASSERT0(mg->mg_histogram[i]);
2161
2162 }
2163
2164 if (vd->vdev_ms_array) {
2165 (void) dmu_object_free(mos, vd->vdev_ms_array, tx);
2166 vd->vdev_ms_array = 0;
2167 }
2168 dmu_tx_commit(tx);
2169 }
2170
2171 void
2172 vdev_sync_done(vdev_t *vd, uint64_t txg)
2173 {
2174 metaslab_t *msp;
2175 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg));
2176
2177 ASSERT(!vd->vdev_ishole);
2178
2179 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg)))
2180 metaslab_sync_done(msp, txg);
2181
2182 if (reassess)
2183 metaslab_sync_reassess(vd->vdev_mg);
2184 }
2185
2186 void
2187 vdev_sync(vdev_t *vd, uint64_t txg)
2188 {
2189 spa_t *spa = vd->vdev_spa;
2190 vdev_t *lvd;
2191 metaslab_t *msp;
2192 dmu_tx_t *tx;
2193
2194 ASSERT(!vd->vdev_ishole);
2195
2196 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) {
2197 ASSERT(vd == vd->vdev_top);
2198 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
2199 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset,
2200 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx);
2201 ASSERT(vd->vdev_ms_array != 0);
2202 vdev_config_dirty(vd);
2203 dmu_tx_commit(tx);
2204 }
2205
2206 /*
2207 * Remove the metadata associated with this vdev once it's empty.
2208 */
2209 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing)
2210 vdev_remove(vd, txg);
2211
2212 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) {
2213 metaslab_sync(msp, txg);
2214 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg));
2215 }
2216
2217 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL)
2218 vdev_dtl_sync(lvd, txg);
2219
2220 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg));
2221 }
2222
2223 uint64_t
2224 vdev_psize_to_asize(vdev_t *vd, uint64_t psize)
2225 {
2226 return (vd->vdev_ops->vdev_op_asize(vd, psize));
2227 }
2228
2229 /*
2230 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2231 * not be opened, and no I/O is attempted.
2232 */
2233 int
2234 vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2235 {
2236 vdev_t *vd, *tvd;
2237
2238 spa_vdev_state_enter(spa, SCL_NONE);
2239
2240 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2241 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2242
2243 if (!vd->vdev_ops->vdev_op_leaf)
2244 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2245
2246 tvd = vd->vdev_top;
2247
2248 /*
2249 * We don't directly use the aux state here, but if we do a
2250 * vdev_reopen(), we need this value to be present to remember why we
2251 * were faulted.
2252 */
2253 vd->vdev_label_aux = aux;
2254
2255 /*
2256 * Faulted state takes precedence over degraded.
2257 */
2258 vd->vdev_delayed_close = B_FALSE;
2259 vd->vdev_faulted = 1ULL;
2260 vd->vdev_degraded = 0ULL;
2261 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux);
2262
2263 /*
2264 * If this device has the only valid copy of the data, then
2265 * back off and simply mark the vdev as degraded instead.
2266 */
2267 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) {
2268 vd->vdev_degraded = 1ULL;
2269 vd->vdev_faulted = 0ULL;
2270
2271 /*
2272 * If we reopen the device and it's not dead, only then do we
2273 * mark it degraded.
2274 */
2275 vdev_reopen(tvd);
2276
2277 if (vdev_readable(vd))
2278 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux);
2279 }
2280
2281 return (spa_vdev_state_exit(spa, vd, 0));
2282 }
2283
2284 /*
2285 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2286 * user that something is wrong. The vdev continues to operate as normal as far
2287 * as I/O is concerned.
2288 */
2289 int
2290 vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux)
2291 {
2292 vdev_t *vd;
2293
2294 spa_vdev_state_enter(spa, SCL_NONE);
2295
2296 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2297 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2298
2299 if (!vd->vdev_ops->vdev_op_leaf)
2300 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2301
2302 /*
2303 * If the vdev is already faulted, then don't do anything.
2304 */
2305 if (vd->vdev_faulted || vd->vdev_degraded)
2306 return (spa_vdev_state_exit(spa, NULL, 0));
2307
2308 vd->vdev_degraded = 1ULL;
2309 if (!vdev_is_dead(vd))
2310 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED,
2311 aux);
2312
2313 return (spa_vdev_state_exit(spa, vd, 0));
2314 }
2315
2316 /*
2317 * Online the given vdev.
2318 *
2319 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached
2320 * spare device should be detached when the device finishes resilvering.
2321 * Second, the online should be treated like a 'test' online case, so no FMA
2322 * events are generated if the device fails to open.
2323 */
2324 int
2325 vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate)
2326 {
2327 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev;
2328
2329 spa_vdev_state_enter(spa, SCL_NONE);
2330
2331 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2332 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2333
2334 if (!vd->vdev_ops->vdev_op_leaf)
2335 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2336
2337 tvd = vd->vdev_top;
2338 vd->vdev_offline = B_FALSE;
2339 vd->vdev_tmpoffline = B_FALSE;
2340 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE);
2341 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT);
2342
2343 /* XXX - L2ARC 1.0 does not support expansion */
2344 if (!vd->vdev_aux) {
2345 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2346 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND);
2347 }
2348
2349 vdev_reopen(tvd);
2350 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE;
2351
2352 if (!vd->vdev_aux) {
2353 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2354 pvd->vdev_expanding = B_FALSE;
2355 }
2356
2357 if (newstate)
2358 *newstate = vd->vdev_state;
2359 if ((flags & ZFS_ONLINE_UNSPARE) &&
2360 !vdev_is_dead(vd) && vd->vdev_parent &&
2361 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2362 vd->vdev_parent->vdev_child[0] == vd)
2363 vd->vdev_unspare = B_TRUE;
2364
2365 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) {
2366
2367 /* XXX - L2ARC 1.0 does not support expansion */
2368 if (vd->vdev_aux)
2369 return (spa_vdev_state_exit(spa, vd, ENOTSUP));
2370 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE);
2371 }
2372 return (spa_vdev_state_exit(spa, vd, 0));
2373 }
2374
2375 static int
2376 vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags)
2377 {
2378 vdev_t *vd, *tvd;
2379 int error = 0;
2380 uint64_t generation;
2381 metaslab_group_t *mg;
2382
2383 top:
2384 spa_vdev_state_enter(spa, SCL_ALLOC);
2385
2386 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
2387 return (spa_vdev_state_exit(spa, NULL, ENODEV));
2388
2389 if (!vd->vdev_ops->vdev_op_leaf)
2390 return (spa_vdev_state_exit(spa, NULL, ENOTSUP));
2391
2392 tvd = vd->vdev_top;
2393 mg = tvd->vdev_mg;
2394 generation = spa->spa_config_generation + 1;
2395
2396 /*
2397 * If the device isn't already offline, try to offline it.
2398 */
2399 if (!vd->vdev_offline) {
2400 /*
2401 * If this device has the only valid copy of some data,
2402 * don't allow it to be offlined. Log devices are always
2403 * expendable.
2404 */
2405 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2406 vdev_dtl_required(vd))
2407 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2408
2409 /*
2410 * If the top-level is a slog and it has had allocations
2411 * then proceed. We check that the vdev's metaslab group
2412 * is not NULL since it's possible that we may have just
2413 * added this vdev but not yet initialized its metaslabs.
2414 */
2415 if (tvd->vdev_islog && mg != NULL) {
2416 /*
2417 * Prevent any future allocations.
2418 */
2419 metaslab_group_passivate(mg);
2420 (void) spa_vdev_state_exit(spa, vd, 0);
2421
2422 error = spa_offline_log(spa);
2423
2424 spa_vdev_state_enter(spa, SCL_ALLOC);
2425
2426 /*
2427 * Check to see if the config has changed.
2428 */
2429 if (error || generation != spa->spa_config_generation) {
2430 metaslab_group_activate(mg);
2431 if (error)
2432 return (spa_vdev_state_exit(spa,
2433 vd, error));
2434 (void) spa_vdev_state_exit(spa, vd, 0);
2435 goto top;
2436 }
2437 ASSERT0(tvd->vdev_stat.vs_alloc);
2438 }
2439
2440 /*
2441 * Offline this device and reopen its top-level vdev.
2442 * If the top-level vdev is a log device then just offline
2443 * it. Otherwise, if this action results in the top-level
2444 * vdev becoming unusable, undo it and fail the request.
2445 */
2446 vd->vdev_offline = B_TRUE;
2447 vdev_reopen(tvd);
2448
2449 if (!tvd->vdev_islog && vd->vdev_aux == NULL &&
2450 vdev_is_dead(tvd)) {
2451 vd->vdev_offline = B_FALSE;
2452 vdev_reopen(tvd);
2453 return (spa_vdev_state_exit(spa, NULL, EBUSY));
2454 }
2455
2456 /*
2457 * Add the device back into the metaslab rotor so that
2458 * once we online the device it's open for business.
2459 */
2460 if (tvd->vdev_islog && mg != NULL)
2461 metaslab_group_activate(mg);
2462 }
2463
2464 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY);
2465
2466 return (spa_vdev_state_exit(spa, vd, 0));
2467 }
2468
2469 int
2470 vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags)
2471 {
2472 int error;
2473
2474 mutex_enter(&spa->spa_vdev_top_lock);
2475 error = vdev_offline_locked(spa, guid, flags);
2476 mutex_exit(&spa->spa_vdev_top_lock);
2477
2478 return (error);
2479 }
2480
2481 /*
2482 * Clear the error counts associated with this vdev. Unlike vdev_online() and
2483 * vdev_offline(), we assume the spa config is locked. We also clear all
2484 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
2485 */
2486 void
2487 vdev_clear(spa_t *spa, vdev_t *vd)
2488 {
2489 vdev_t *rvd = spa->spa_root_vdev;
2490
2491 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
2492
2493 if (vd == NULL)
2494 vd = rvd;
2495
2496 vd->vdev_stat.vs_read_errors = 0;
2497 vd->vdev_stat.vs_write_errors = 0;
2498 vd->vdev_stat.vs_checksum_errors = 0;
2499
2500 for (int c = 0; c < vd->vdev_children; c++)
2501 vdev_clear(spa, vd->vdev_child[c]);
2502
2503 /*
2504 * If we're in the FAULTED state or have experienced failed I/O, then
2505 * clear the persistent state and attempt to reopen the device. We
2506 * also mark the vdev config dirty, so that the new faulted state is
2507 * written out to disk.
2508 */
2509 if (vd->vdev_faulted || vd->vdev_degraded ||
2510 !vdev_readable(vd) || !vdev_writeable(vd)) {
2511
2512 /*
2513 * When reopening in reponse to a clear event, it may be due to
2514 * a fmadm repair request. In this case, if the device is
2515 * still broken, we want to still post the ereport again.
2516 */
2517 vd->vdev_forcefault = B_TRUE;
2518
2519 vd->vdev_faulted = vd->vdev_degraded = 0ULL;
2520 vd->vdev_cant_read = B_FALSE;
2521 vd->vdev_cant_write = B_FALSE;
2522
2523 vdev_reopen(vd == rvd ? rvd : vd->vdev_top);
2524
2525 vd->vdev_forcefault = B_FALSE;
2526
2527 if (vd != rvd && vdev_writeable(vd->vdev_top))
2528 vdev_state_dirty(vd->vdev_top);
2529
2530 if (vd->vdev_aux == NULL && !vdev_is_dead(vd))
2531 spa_async_request(spa, SPA_ASYNC_RESILVER);
2532
2533 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR);
2534 }
2535
2536 /*
2537 * When clearing a FMA-diagnosed fault, we always want to
2538 * unspare the device, as we assume that the original spare was
2539 * done in response to the FMA fault.
2540 */
2541 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL &&
2542 vd->vdev_parent->vdev_ops == &vdev_spare_ops &&
2543 vd->vdev_parent->vdev_child[0] == vd)
2544 vd->vdev_unspare = B_TRUE;
2545 }
2546
2547 boolean_t
2548 vdev_is_dead(vdev_t *vd)
2549 {
2550 /*
2551 * Holes and missing devices are always considered "dead".
2552 * This simplifies the code since we don't have to check for
2553 * these types of devices in the various code paths.
2554 * Instead we rely on the fact that we skip over dead devices
2555 * before issuing I/O to them.
2556 */
2557 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole ||
2558 vd->vdev_ops == &vdev_missing_ops);
2559 }
2560
2561 boolean_t
2562 vdev_readable(vdev_t *vd)
2563 {
2564 return (!vdev_is_dead(vd) && !vd->vdev_cant_read);
2565 }
2566
2567 boolean_t
2568 vdev_writeable(vdev_t *vd)
2569 {
2570 return (!vdev_is_dead(vd) && !vd->vdev_cant_write);
2571 }
2572
2573 boolean_t
2574 vdev_allocatable(vdev_t *vd)
2575 {
2576 uint64_t state = vd->vdev_state;
2577
2578 /*
2579 * We currently allow allocations from vdevs which may be in the
2580 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
2581 * fails to reopen then we'll catch it later when we're holding
2582 * the proper locks. Note that we have to get the vdev state
2583 * in a local variable because although it changes atomically,
2584 * we're asking two separate questions about it.
2585 */
2586 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) &&
2587 !vd->vdev_cant_write && !vd->vdev_ishole);
2588 }
2589
2590 boolean_t
2591 vdev_accessible(vdev_t *vd, zio_t *zio)
2592 {
2593 ASSERT(zio->io_vd == vd);
2594
2595 if (vdev_is_dead(vd) || vd->vdev_remove_wanted)
2596 return (B_FALSE);
2597
2598 if (zio->io_type == ZIO_TYPE_READ)
2599 return (!vd->vdev_cant_read);
2600
2601 if (zio->io_type == ZIO_TYPE_WRITE)
2602 return (!vd->vdev_cant_write);
2603
2604 return (B_TRUE);
2605 }
2606
2607 /*
2608 * Get statistics for the given vdev.
2609 */
2610 void
2611 vdev_get_stats(vdev_t *vd, vdev_stat_t *vs)
2612 {
2613 spa_t *spa = vd->vdev_spa;
2614 vdev_t *rvd = spa->spa_root_vdev;
2615
2616 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
2617
2618 mutex_enter(&vd->vdev_stat_lock);
2619 bcopy(&vd->vdev_stat, vs, sizeof (*vs));
2620 vs->vs_timestamp = gethrtime() - vs->vs_timestamp;
2621 vs->vs_state = vd->vdev_state;
2622 vs->vs_rsize = vdev_get_min_asize(vd);
2623 if (vd->vdev_ops->vdev_op_leaf)
2624 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE;
2625 vs->vs_esize = vd->vdev_max_asize - vd->vdev_asize;
2626 if (vd->vdev_aux == NULL && vd == vd->vdev_top && !vd->vdev_ishole) {
2627 vs->vs_fragmentation = vd->vdev_mg->mg_fragmentation;
2628 }
2629
2630 /*
2631 * If we're getting stats on the root vdev, aggregate the I/O counts
2632 * over all top-level vdevs (i.e. the direct children of the root).
2633 */
2634 if (vd == rvd) {
2635 for (int c = 0; c < rvd->vdev_children; c++) {
2636 vdev_t *cvd = rvd->vdev_child[c];
2637 vdev_stat_t *cvs = &cvd->vdev_stat;
2638
2639 for (int t = 0; t < ZIO_TYPES; t++) {
2640 vs->vs_ops[t] += cvs->vs_ops[t];
2641 vs->vs_bytes[t] += cvs->vs_bytes[t];
2642 }
2643 cvs->vs_scan_removing = cvd->vdev_removing;
2644 }
2645 }
2646 mutex_exit(&vd->vdev_stat_lock);
2647 }
2648
2649 void
2650 vdev_clear_stats(vdev_t *vd)
2651 {
2652 mutex_enter(&vd->vdev_stat_lock);
2653 vd->vdev_stat.vs_space = 0;
2654 vd->vdev_stat.vs_dspace = 0;
2655 vd->vdev_stat.vs_alloc = 0;
2656 mutex_exit(&vd->vdev_stat_lock);
2657 }
2658
2659 void
2660 vdev_scan_stat_init(vdev_t *vd)
2661 {
2662 vdev_stat_t *vs = &vd->vdev_stat;
2663
2664 for (int c = 0; c < vd->vdev_children; c++)
2665 vdev_scan_stat_init(vd->vdev_child[c]);
2666
2667 mutex_enter(&vd->vdev_stat_lock);
2668 vs->vs_scan_processed = 0;
2669 mutex_exit(&vd->vdev_stat_lock);
2670 }
2671
2672 void
2673 vdev_stat_update(zio_t *zio, uint64_t psize)
2674 {
2675 spa_t *spa = zio->io_spa;
2676 vdev_t *rvd = spa->spa_root_vdev;
2677 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd;
2678 vdev_t *pvd;
2679 uint64_t txg = zio->io_txg;
2680 vdev_stat_t *vs = &vd->vdev_stat;
2681 zio_type_t type = zio->io_type;
2682 int flags = zio->io_flags;
2683
2684 /*
2685 * If this i/o is a gang leader, it didn't do any actual work.
2686 */
2687 if (zio->io_gang_tree)
2688 return;
2689
2690 if (zio->io_error == 0) {
2691 /*
2692 * If this is a root i/o, don't count it -- we've already
2693 * counted the top-level vdevs, and vdev_get_stats() will
2694 * aggregate them when asked. This reduces contention on
2695 * the root vdev_stat_lock and implicitly handles blocks
2696 * that compress away to holes, for which there is no i/o.
2697 * (Holes never create vdev children, so all the counters
2698 * remain zero, which is what we want.)
2699 *
2700 * Note: this only applies to successful i/o (io_error == 0)
2701 * because unlike i/o counts, errors are not additive.
2702 * When reading a ditto block, for example, failure of
2703 * one top-level vdev does not imply a root-level error.
2704 */
2705 if (vd == rvd)
2706 return;
2707
2708 ASSERT(vd == zio->io_vd);
2709
2710 if (flags & ZIO_FLAG_IO_BYPASS)
2711 return;
2712
2713 mutex_enter(&vd->vdev_stat_lock);
2714
2715 if (flags & ZIO_FLAG_IO_REPAIR) {
2716 if (flags & ZIO_FLAG_SCAN_THREAD) {
2717 dsl_scan_phys_t *scn_phys =
2718 &spa->spa_dsl_pool->dp_scan->scn_phys;
2719 uint64_t *processed = &scn_phys->scn_processed;
2720
2721 /* XXX cleanup? */
2722 if (vd->vdev_ops->vdev_op_leaf)
2723 atomic_add_64(processed, psize);
2724 vs->vs_scan_processed += psize;
2725 }
2726
2727 if (flags & ZIO_FLAG_SELF_HEAL)
2728 vs->vs_self_healed += psize;
2729 }
2730
2731 vs->vs_ops[type]++;
2732 vs->vs_bytes[type] += psize;
2733
2734 mutex_exit(&vd->vdev_stat_lock);
2735 return;
2736 }
2737
2738 if (flags & ZIO_FLAG_SPECULATIVE)
2739 return;
2740
2741 /*
2742 * If this is an I/O error that is going to be retried, then ignore the
2743 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
2744 * hard errors, when in reality they can happen for any number of
2745 * innocuous reasons (bus resets, MPxIO link failure, etc).
2746 */
2747 if (zio->io_error == EIO &&
2748 !(zio->io_flags & ZIO_FLAG_IO_RETRY))
2749 return;
2750
2751 /*
2752 * Intent logs writes won't propagate their error to the root
2753 * I/O so don't mark these types of failures as pool-level
2754 * errors.
2755 */
2756 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE))
2757 return;
2758
2759 mutex_enter(&vd->vdev_stat_lock);
2760 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) {
2761 if (zio->io_error == ECKSUM)
2762 vs->vs_checksum_errors++;
2763 else
2764 vs->vs_read_errors++;
2765 }
2766 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd))
2767 vs->vs_write_errors++;
2768 mutex_exit(&vd->vdev_stat_lock);
2769
2770 if (type == ZIO_TYPE_WRITE && txg != 0 &&
2771 (!(flags & ZIO_FLAG_IO_REPAIR) ||
2772 (flags & ZIO_FLAG_SCAN_THREAD) ||
2773 spa->spa_claiming)) {
2774 /*
2775 * This is either a normal write (not a repair), or it's
2776 * a repair induced by the scrub thread, or it's a repair
2777 * made by zil_claim() during spa_load() in the first txg.
2778 * In the normal case, we commit the DTL change in the same
2779 * txg as the block was born. In the scrub-induced repair
2780 * case, we know that scrubs run in first-pass syncing context,
2781 * so we commit the DTL change in spa_syncing_txg(spa).
2782 * In the zil_claim() case, we commit in spa_first_txg(spa).
2783 *
2784 * We currently do not make DTL entries for failed spontaneous
2785 * self-healing writes triggered by normal (non-scrubbing)
2786 * reads, because we have no transactional context in which to
2787 * do so -- and it's not clear that it'd be desirable anyway.
2788 */
2789 if (vd->vdev_ops->vdev_op_leaf) {
2790 uint64_t commit_txg = txg;
2791 if (flags & ZIO_FLAG_SCAN_THREAD) {
2792 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
2793 ASSERT(spa_sync_pass(spa) == 1);
2794 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1);
2795 commit_txg = spa_syncing_txg(spa);
2796 } else if (spa->spa_claiming) {
2797 ASSERT(flags & ZIO_FLAG_IO_REPAIR);
2798 commit_txg = spa_first_txg(spa);
2799 }
2800 ASSERT(commit_txg >= spa_syncing_txg(spa));
2801 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1))
2802 return;
2803 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent)
2804 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1);
2805 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg);
2806 }
2807 if (vd != rvd)
2808 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1);
2809 }
2810 }
2811
2812 /*
2813 * Update the in-core space usage stats for this vdev, its metaslab class,
2814 * and the root vdev.
2815 */
2816 void
2817 vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta,
2818 int64_t space_delta)
2819 {
2820 int64_t dspace_delta = space_delta;
2821 spa_t *spa = vd->vdev_spa;
2822 vdev_t *rvd = spa->spa_root_vdev;
2823 metaslab_group_t *mg = vd->vdev_mg;
2824 metaslab_class_t *mc = mg ? mg->mg_class : NULL;
2825
2826 ASSERT(vd == vd->vdev_top);
2827
2828 /*
2829 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2830 * factor. We must calculate this here and not at the root vdev
2831 * because the root vdev's psize-to-asize is simply the max of its
2832 * childrens', thus not accurate enough for us.
2833 */
2834 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0);
2835 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache);
2836 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) *
2837 vd->vdev_deflate_ratio;
2838
2839 mutex_enter(&vd->vdev_stat_lock);
2840 vd->vdev_stat.vs_alloc += alloc_delta;
2841 vd->vdev_stat.vs_space += space_delta;
2842 vd->vdev_stat.vs_dspace += dspace_delta;
2843 mutex_exit(&vd->vdev_stat_lock);
2844
2845 if (mc == spa_normal_class(spa)) {
2846 mutex_enter(&rvd->vdev_stat_lock);
2847 rvd->vdev_stat.vs_alloc += alloc_delta;
2848 rvd->vdev_stat.vs_space += space_delta;
2849 rvd->vdev_stat.vs_dspace += dspace_delta;
2850 mutex_exit(&rvd->vdev_stat_lock);
2851 }
2852
2853 if (mc != NULL) {
2854 ASSERT(rvd == vd->vdev_parent);
2855 ASSERT(vd->vdev_ms_count != 0);
2856
2857 metaslab_class_space_update(mc,
2858 alloc_delta, defer_delta, space_delta, dspace_delta);
2859 }
2860 }
2861
2862 /*
2863 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2864 * so that it will be written out next time the vdev configuration is synced.
2865 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2866 */
2867 void
2868 vdev_config_dirty(vdev_t *vd)
2869 {
2870 spa_t *spa = vd->vdev_spa;
2871 vdev_t *rvd = spa->spa_root_vdev;
2872 int c;
2873
2874 ASSERT(spa_writeable(spa));
2875
2876 /*
2877 * If this is an aux vdev (as with l2cache and spare devices), then we
2878 * update the vdev config manually and set the sync flag.
2879 */
2880 if (vd->vdev_aux != NULL) {
2881 spa_aux_vdev_t *sav = vd->vdev_aux;
2882 nvlist_t **aux;
2883 uint_t naux;
2884
2885 for (c = 0; c < sav->sav_count; c++) {
2886 if (sav->sav_vdevs[c] == vd)
2887 break;
2888 }
2889
2890 if (c == sav->sav_count) {
2891 /*
2892 * We're being removed. There's nothing more to do.
2893 */
2894 ASSERT(sav->sav_sync == B_TRUE);
2895 return;
2896 }
2897
2898 sav->sav_sync = B_TRUE;
2899
2900 if (nvlist_lookup_nvlist_array(sav->sav_config,
2901 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) {
2902 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
2903 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0);
2904 }
2905
2906 ASSERT(c < naux);
2907
2908 /*
2909 * Setting the nvlist in the middle if the array is a little
2910 * sketchy, but it will work.
2911 */
2912 nvlist_free(aux[c]);
2913 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0);
2914
2915 return;
2916 }
2917
2918 /*
2919 * The dirty list is protected by the SCL_CONFIG lock. The caller
2920 * must either hold SCL_CONFIG as writer, or must be the sync thread
2921 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2922 * so this is sufficient to ensure mutual exclusion.
2923 */
2924 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
2925 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2926 spa_config_held(spa, SCL_CONFIG, RW_READER)));
2927
2928 if (vd == rvd) {
2929 for (c = 0; c < rvd->vdev_children; c++)
2930 vdev_config_dirty(rvd->vdev_child[c]);
2931 } else {
2932 ASSERT(vd == vd->vdev_top);
2933
2934 if (!list_link_active(&vd->vdev_config_dirty_node) &&
2935 !vd->vdev_ishole)
2936 list_insert_head(&spa->spa_config_dirty_list, vd);
2937 }
2938 }
2939
2940 void
2941 vdev_config_clean(vdev_t *vd)
2942 {
2943 spa_t *spa = vd->vdev_spa;
2944
2945 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) ||
2946 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2947 spa_config_held(spa, SCL_CONFIG, RW_READER)));
2948
2949 ASSERT(list_link_active(&vd->vdev_config_dirty_node));
2950 list_remove(&spa->spa_config_dirty_list, vd);
2951 }
2952
2953 /*
2954 * Mark a top-level vdev's state as dirty, so that the next pass of
2955 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2956 * the state changes from larger config changes because they require
2957 * much less locking, and are often needed for administrative actions.
2958 */
2959 void
2960 vdev_state_dirty(vdev_t *vd)
2961 {
2962 spa_t *spa = vd->vdev_spa;
2963
2964 ASSERT(spa_writeable(spa));
2965 ASSERT(vd == vd->vdev_top);
2966
2967 /*
2968 * The state list is protected by the SCL_STATE lock. The caller
2969 * must either hold SCL_STATE as writer, or must be the sync thread
2970 * (which holds SCL_STATE as reader). There's only one sync thread,
2971 * so this is sufficient to ensure mutual exclusion.
2972 */
2973 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
2974 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2975 spa_config_held(spa, SCL_STATE, RW_READER)));
2976
2977 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole)
2978 list_insert_head(&spa->spa_state_dirty_list, vd);
2979 }
2980
2981 void
2982 vdev_state_clean(vdev_t *vd)
2983 {
2984 spa_t *spa = vd->vdev_spa;
2985
2986 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) ||
2987 (dsl_pool_sync_context(spa_get_dsl(spa)) &&
2988 spa_config_held(spa, SCL_STATE, RW_READER)));
2989
2990 ASSERT(list_link_active(&vd->vdev_state_dirty_node));
2991 list_remove(&spa->spa_state_dirty_list, vd);
2992 }
2993
2994 /*
2995 * Propagate vdev state up from children to parent.
2996 */
2997 void
2998 vdev_propagate_state(vdev_t *vd)
2999 {
3000 spa_t *spa = vd->vdev_spa;
3001 vdev_t *rvd = spa->spa_root_vdev;
3002 int degraded = 0, faulted = 0;
3003 int corrupted = 0;
3004 vdev_t *child;
3005
3006 if (vd->vdev_children > 0) {
3007 for (int c = 0; c < vd->vdev_children; c++) {
3008 child = vd->vdev_child[c];
3009
3010 /*
3011 * Don't factor holes into the decision.
3012 */
3013 if (child->vdev_ishole)
3014 continue;
3015
3016 if (!vdev_readable(child) ||
3017 (!vdev_writeable(child) && spa_writeable(spa))) {
3018 /*
3019 * Root special: if there is a top-level log
3020 * device, treat the root vdev as if it were
3021 * degraded.
3022 */
3023 if (child->vdev_islog && vd == rvd)
3024 degraded++;
3025 else
3026 faulted++;
3027 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) {
3028 degraded++;
3029 }
3030
3031 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA)
3032 corrupted++;
3033 }
3034
3035 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded);
3036
3037 /*
3038 * Root special: if there is a top-level vdev that cannot be
3039 * opened due to corrupted metadata, then propagate the root
3040 * vdev's aux state as 'corrupt' rather than 'insufficient
3041 * replicas'.
3042 */
3043 if (corrupted && vd == rvd &&
3044 rvd->vdev_state == VDEV_STATE_CANT_OPEN)
3045 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN,
3046 VDEV_AUX_CORRUPT_DATA);
3047 }
3048
3049 if (vd->vdev_parent)
3050 vdev_propagate_state(vd->vdev_parent);
3051 }
3052
3053 /*
3054 * Set a vdev's state. If this is during an open, we don't update the parent
3055 * state, because we're in the process of opening children depth-first.
3056 * Otherwise, we propagate the change to the parent.
3057 *
3058 * If this routine places a device in a faulted state, an appropriate ereport is
3059 * generated.
3060 */
3061 void
3062 vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux)
3063 {
3064 uint64_t save_state;
3065 spa_t *spa = vd->vdev_spa;
3066
3067 if (state == vd->vdev_state) {
3068 vd->vdev_stat.vs_aux = aux;
3069 return;
3070 }
3071
3072 save_state = vd->vdev_state;
3073
3074 vd->vdev_state = state;
3075 vd->vdev_stat.vs_aux = aux;
3076
3077 /*
3078 * If we are setting the vdev state to anything but an open state, then
3079 * always close the underlying device unless the device has requested
3080 * a delayed close (i.e. we're about to remove or fault the device).
3081 * Otherwise, we keep accessible but invalid devices open forever.
3082 * We don't call vdev_close() itself, because that implies some extra
3083 * checks (offline, etc) that we don't want here. This is limited to
3084 * leaf devices, because otherwise closing the device will affect other
3085 * children.
3086 */
3087 if (!vd->vdev_delayed_close && vdev_is_dead(vd) &&
3088 vd->vdev_ops->vdev_op_leaf)
3089 vd->vdev_ops->vdev_op_close(vd);
3090
3091 /*
3092 * If we have brought this vdev back into service, we need
3093 * to notify fmd so that it can gracefully repair any outstanding
3094 * cases due to a missing device. We do this in all cases, even those
3095 * that probably don't correlate to a repaired fault. This is sure to
3096 * catch all cases, and we let the zfs-retire agent sort it out. If
3097 * this is a transient state it's OK, as the retire agent will
3098 * double-check the state of the vdev before repairing it.
3099 */
3100 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf &&
3101 vd->vdev_prevstate != state)
3102 zfs_post_state_change(spa, vd);
3103
3104 if (vd->vdev_removed &&
3105 state == VDEV_STATE_CANT_OPEN &&
3106 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) {
3107 /*
3108 * If the previous state is set to VDEV_STATE_REMOVED, then this
3109 * device was previously marked removed and someone attempted to
3110 * reopen it. If this failed due to a nonexistent device, then
3111 * keep the device in the REMOVED state. We also let this be if
3112 * it is one of our special test online cases, which is only
3113 * attempting to online the device and shouldn't generate an FMA
3114 * fault.
3115 */
3116 vd->vdev_state = VDEV_STATE_REMOVED;
3117 vd->vdev_stat.vs_aux = VDEV_AUX_NONE;
3118 } else if (state == VDEV_STATE_REMOVED) {
3119 vd->vdev_removed = B_TRUE;
3120 } else if (state == VDEV_STATE_CANT_OPEN) {
3121 /*
3122 * If we fail to open a vdev during an import or recovery, we
3123 * mark it as "not available", which signifies that it was
3124 * never there to begin with. Failure to open such a device
3125 * is not considered an error.
3126 */
3127 if ((spa_load_state(spa) == SPA_LOAD_IMPORT ||
3128 spa_load_state(spa) == SPA_LOAD_RECOVER) &&
3129 vd->vdev_ops->vdev_op_leaf)
3130 vd->vdev_not_present = 1;
3131
3132 /*
3133 * Post the appropriate ereport. If the 'prevstate' field is
3134 * set to something other than VDEV_STATE_UNKNOWN, it indicates
3135 * that this is part of a vdev_reopen(). In this case, we don't
3136 * want to post the ereport if the device was already in the
3137 * CANT_OPEN state beforehand.
3138 *
3139 * If the 'checkremove' flag is set, then this is an attempt to
3140 * online the device in response to an insertion event. If we
3141 * hit this case, then we have detected an insertion event for a
3142 * faulted or offline device that wasn't in the removed state.
3143 * In this scenario, we don't post an ereport because we are
3144 * about to replace the device, or attempt an online with
3145 * vdev_forcefault, which will generate the fault for us.
3146 */
3147 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) &&
3148 !vd->vdev_not_present && !vd->vdev_checkremove &&
3149 vd != spa->spa_root_vdev) {
3150 const char *class;
3151
3152 switch (aux) {
3153 case VDEV_AUX_OPEN_FAILED:
3154 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED;
3155 break;
3156 case VDEV_AUX_CORRUPT_DATA:
3157 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA;
3158 break;
3159 case VDEV_AUX_NO_REPLICAS:
3160 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS;
3161 break;
3162 case VDEV_AUX_BAD_GUID_SUM:
3163 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM;
3164 break;
3165 case VDEV_AUX_TOO_SMALL:
3166 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL;
3167 break;
3168 case VDEV_AUX_BAD_LABEL:
3169 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL;
3170 break;
3171 default:
3172 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN;
3173 }
3174
3175 zfs_ereport_post(class, spa, vd, NULL, save_state, 0);
3176 }
3177
3178 /* Erase any notion of persistent removed state */
3179 vd->vdev_removed = B_FALSE;
3180 } else {
3181 vd->vdev_removed = B_FALSE;
3182 }
3183
3184 if (!isopen && vd->vdev_parent)
3185 vdev_propagate_state(vd->vdev_parent);
3186 }
3187
3188 /*
3189 * Check the vdev configuration to ensure that it's capable of supporting
3190 * a root pool. Currently, we do not support RAID-Z or partial configuration.
3191 * In addition, only a single top-level vdev is allowed and none of the leaves
3192 * can be wholedisks.
3193 */
3194 boolean_t
3195 vdev_is_bootable(vdev_t *vd)
3196 {
3197 if (!vd->vdev_ops->vdev_op_leaf) {
3198 char *vdev_type = vd->vdev_ops->vdev_op_type;
3199
3200 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 &&
3201 vd->vdev_children > 1) {
3202 return (B_FALSE);
3203 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 ||
3204 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) {
3205 return (B_FALSE);
3206 }
3207 }
3208
3209 for (int c = 0; c < vd->vdev_children; c++) {
3210 if (!vdev_is_bootable(vd->vdev_child[c]))
3211 return (B_FALSE);
3212 }
3213 return (B_TRUE);
3214 }
3215
3216 /*
3217 * Load the state from the original vdev tree (ovd) which
3218 * we've retrieved from the MOS config object. If the original
3219 * vdev was offline or faulted then we transfer that state to the
3220 * device in the current vdev tree (nvd).
3221 */
3222 void
3223 vdev_load_log_state(vdev_t *nvd, vdev_t *ovd)
3224 {
3225 spa_t *spa = nvd->vdev_spa;
3226
3227 ASSERT(nvd->vdev_top->vdev_islog);
3228 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
3229 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid);
3230
3231 for (int c = 0; c < nvd->vdev_children; c++)
3232 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]);
3233
3234 if (nvd->vdev_ops->vdev_op_leaf) {
3235 /*
3236 * Restore the persistent vdev state
3237 */
3238 nvd->vdev_offline = ovd->vdev_offline;
3239 nvd->vdev_faulted = ovd->vdev_faulted;
3240 nvd->vdev_degraded = ovd->vdev_degraded;
3241 nvd->vdev_removed = ovd->vdev_removed;
3242 }
3243 }
3244
3245 /*
3246 * Determine if a log device has valid content. If the vdev was
3247 * removed or faulted in the MOS config then we know that
3248 * the content on the log device has already been written to the pool.
3249 */
3250 boolean_t
3251 vdev_log_state_valid(vdev_t *vd)
3252 {
3253 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted &&
3254 !vd->vdev_removed)
3255 return (B_TRUE);
3256
3257 for (int c = 0; c < vd->vdev_children; c++)
3258 if (vdev_log_state_valid(vd->vdev_child[c]))
3259 return (B_TRUE);
3260
3261 return (B_FALSE);
3262 }
3263
3264 /*
3265 * Expand a vdev if possible.
3266 */
3267 void
3268 vdev_expand(vdev_t *vd, uint64_t txg)
3269 {
3270 ASSERT(vd->vdev_top == vd);
3271 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
3272
3273 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) {
3274 VERIFY(vdev_metaslab_init(vd, txg) == 0);
3275 vdev_config_dirty(vd);
3276 }
3277 }
3278
3279 /*
3280 * Split a vdev.
3281 */
3282 void
3283 vdev_split(vdev_t *vd)
3284 {
3285 vdev_t *cvd, *pvd = vd->vdev_parent;
3286
3287 vdev_remove_child(pvd, vd);
3288 vdev_compact_children(pvd);
3289
3290 cvd = pvd->vdev_child[0];
3291 if (pvd->vdev_children == 1) {
3292 vdev_remove_parent(cvd);
3293 cvd->vdev_splitting = B_TRUE;
3294 }
3295 vdev_propagate_state(cvd);
3296 }
3297
3298 void
3299 vdev_deadman(vdev_t *vd)
3300 {
3301 for (int c = 0; c < vd->vdev_children; c++) {
3302 vdev_t *cvd = vd->vdev_child[c];
3303
3304 vdev_deadman(cvd);
3305 }
3306
3307 if (vd->vdev_ops->vdev_op_leaf) {
3308 vdev_queue_t *vq = &vd->vdev_queue;
3309
3310 mutex_enter(&vq->vq_lock);
3311 if (avl_numnodes(&vq->vq_active_tree) > 0) {
3312 spa_t *spa = vd->vdev_spa;
3313 zio_t *fio;
3314 uint64_t delta;
3315
3316 /*
3317 * Look at the head of all the pending queues,
3318 * if any I/O has been outstanding for longer than
3319 * the spa_deadman_synctime we panic the system.
3320 */
3321 fio = avl_first(&vq->vq_active_tree);
3322 delta = gethrtime() - fio->io_timestamp;
3323 if (delta > spa_deadman_synctime(spa)) {
3324 zfs_dbgmsg("SLOW IO: zio timestamp %lluns, "
3325 "delta %lluns, last io %lluns",
3326 fio->io_timestamp, delta,
3327 vq->vq_io_complete_ts);
3328 fm_panic("I/O to pool '%s' appears to be "
3329 "hung.", spa_name(spa));
3330 }
3331 }
3332 mutex_exit(&vq->vq_lock);
3333 }
3334 }