1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
28 */
29
30 #include <sys/zfs_context.h>
31 #include <sys/spa.h>
32 #include <sys/spa_impl.h>
33 #include <sys/dsl_pool.h>
34 #include <sys/dsl_scan.h>
35 #include <sys/vdev_impl.h>
36 #include <sys/zio.h>
37 #include <sys/fs/zfs.h>
38
39 /*
40 * Virtual device vector for mirroring.
41 */
42
43 typedef struct mirror_child {
44 vdev_t *mc_vd;
45 uint64_t mc_offset;
46 int mc_error;
47 int mc_load;
48 uint8_t mc_tried;
49 uint8_t mc_skipped;
50 uint8_t mc_speculative;
51 } mirror_child_t;
52
53 typedef struct mirror_map {
54 int *mm_preferred;
55 int mm_preferred_cnt;
56 int mm_children;
57 boolean_t mm_resilvering;
58 boolean_t mm_root;
59 mirror_child_t mm_child[];
60 } mirror_map_t;
61
62 static int vdev_mirror_shift = 21;
63
64 #ifdef _KERNEL
65 SYSCTL_DECL(_vfs_zfs_vdev);
66 static SYSCTL_NODE(_vfs_zfs_vdev, OID_AUTO, mirror, CTLFLAG_RD, 0,
67 "ZFS VDEV Mirror");
68 #endif
69
70 /*
71 * The load configuration settings below are tuned by default for
72 * the case where all devices are of the same rotational type.
73 *
74 * If there is a mixture of rotating and non-rotating media, setting
75 * non_rotating_seek_inc to 0 may well provide better results as it
76 * will direct more reads to the non-rotating vdevs which are more
77 * likely to have a higher performance.
78 */
79
80 /* Rotating media load calculation configuration. */
81 static int rotating_inc = 0;
82 #ifdef _KERNEL
83 TUNABLE_INT("vfs.zfs.vdev.mirror.rotating_inc", &rotating_inc);
84 SYSCTL_INT(_vfs_zfs_vdev_mirror, OID_AUTO, rotating_inc, CTLFLAG_RW,
85 &rotating_inc, 0, "Rotating media load increment for non-seeking I/O's");
86 #endif
87
88 static int rotating_seek_inc = 5;
89 #ifdef _KERNEL
90 TUNABLE_INT("vfs.zfs.vdev.mirror.rotating_seek_inc", &rotating_seek_inc);
91 SYSCTL_INT(_vfs_zfs_vdev_mirror, OID_AUTO, rotating_seek_inc, CTLFLAG_RW,
92 &rotating_seek_inc, 0, "Rotating media load increment for seeking I/O's");
93 #endif
94
95 static int rotating_seek_offset = 1 * 1024 * 1024;
96 #ifdef _KERNEL
97 TUNABLE_INT("vfs.zfs.vdev.mirror.rotating_seek_offset", &rotating_seek_offset);
98 SYSCTL_INT(_vfs_zfs_vdev_mirror, OID_AUTO, rotating_seek_offset, CTLFLAG_RW,
99 &rotating_seek_offset, 0, "Offset in bytes from the last I/O which "
100 "triggers a reduced rotating media seek increment");
101 #endif
102
103 /* Non-rotating media load calculation configuration. */
104 static int non_rotating_inc = 0;
105 #ifdef _KERNEL
106 TUNABLE_INT("vfs.zfs.vdev.mirror.non_rotating_inc", &non_rotating_inc);
107 SYSCTL_INT(_vfs_zfs_vdev_mirror, OID_AUTO, non_rotating_inc, CTLFLAG_RW,
108 &non_rotating_inc, 0,
109 "Non-rotating media load increment for non-seeking I/O's");
110 #endif
111
112 static int non_rotating_seek_inc = 1;
113 #ifdef _KERNEL
114 TUNABLE_INT("vfs.zfs.vdev.mirror.non_rotating_seek_inc",
115 &non_rotating_seek_inc);
116 SYSCTL_INT(_vfs_zfs_vdev_mirror, OID_AUTO, non_rotating_seek_inc, CTLFLAG_RW,
117 &non_rotating_seek_inc, 0,
118 "Non-rotating media load increment for seeking I/O's");
119 #endif
120
121
122 static inline size_t
vdev_mirror_map_size(int children)123 vdev_mirror_map_size(int children)
124 {
125 return (offsetof(mirror_map_t, mm_child[children]) +
126 sizeof(int) * children);
127 }
128
129 static inline mirror_map_t *
vdev_mirror_map_alloc(int children,boolean_t resilvering,boolean_t root)130 vdev_mirror_map_alloc(int children, boolean_t resilvering, boolean_t root)
131 {
132 mirror_map_t *mm;
133
134 mm = kmem_zalloc(vdev_mirror_map_size(children), KM_SLEEP);
135 mm->mm_children = children;
136 mm->mm_resilvering = resilvering;
137 mm->mm_root = root;
138 mm->mm_preferred = (int *)((uintptr_t)mm +
139 offsetof(mirror_map_t, mm_child[children]));
140
141 return mm;
142 }
143
144 static void
vdev_mirror_map_free(zio_t * zio)145 vdev_mirror_map_free(zio_t *zio)
146 {
147 mirror_map_t *mm = zio->io_vsd;
148
149 kmem_free(mm, vdev_mirror_map_size(mm->mm_children));
150 }
151
152 static const zio_vsd_ops_t vdev_mirror_vsd_ops = {
153 vdev_mirror_map_free,
154 zio_vsd_default_cksum_report
155 };
156
157 static int
vdev_mirror_load(mirror_map_t * mm,vdev_t * vd,uint64_t zio_offset)158 vdev_mirror_load(mirror_map_t *mm, vdev_t *vd, uint64_t zio_offset)
159 {
160 uint64_t lastoffset;
161 int load;
162
163 /* All DVAs have equal weight at the root. */
164 if (mm->mm_root)
165 return (INT_MAX);
166
167 /*
168 * We don't return INT_MAX if the device is resilvering i.e.
169 * vdev_resilver_txg != 0 as when tested performance was slightly
170 * worse overall when resilvering with compared to without.
171 */
172
173 /* Standard load based on pending queue length. */
174 load = vdev_queue_length(vd);
175 lastoffset = vdev_queue_lastoffset(vd);
176
177 if (vd->vdev_rotation_rate == VDEV_RATE_NON_ROTATING) {
178 /* Non-rotating media. */
179 if (lastoffset == zio_offset)
180 return (load + non_rotating_inc);
181
182 /*
183 * Apply a seek penalty even for non-rotating devices as
184 * sequential I/O'a can be aggregated into fewer operations
185 * on the device, thus avoiding unnecessary per-command
186 * overhead and boosting performance.
187 */
188 return (load + non_rotating_seek_inc);
189 }
190
191 /* Rotating media I/O's which directly follow the last I/O. */
192 if (lastoffset == zio_offset)
193 return (load + rotating_inc);
194
195 /*
196 * Apply half the seek increment to I/O's within seek offset
197 * of the last I/O queued to this vdev as they should incure less
198 * of a seek increment.
199 */
200 if (ABS(lastoffset - zio_offset) < rotating_seek_offset)
201 return (load + (rotating_seek_inc / 2));
202
203 /* Apply the full seek increment to all other I/O's. */
204 return (load + rotating_seek_inc);
205 }
206
207
208 static mirror_map_t *
vdev_mirror_map_init(zio_t * zio)209 vdev_mirror_map_init(zio_t *zio)
210 {
211 mirror_map_t *mm = NULL;
212 mirror_child_t *mc;
213 vdev_t *vd = zio->io_vd;
214 int c;
215
216 if (vd == NULL) {
217 dva_t *dva = zio->io_bp->blk_dva;
218 spa_t *spa = zio->io_spa;
219
220 mm = vdev_mirror_map_alloc(BP_GET_NDVAS(zio->io_bp), B_FALSE,
221 B_TRUE);
222 for (c = 0; c < mm->mm_children; c++) {
223 mc = &mm->mm_child[c];
224 mc->mc_vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[c]));
225 mc->mc_offset = DVA_GET_OFFSET(&dva[c]);
226 }
227 } else {
228 /*
229 * If we are resilvering, then we should handle scrub reads
230 * differently; we shouldn't issue them to the resilvering
231 * device because it might not have those blocks.
232 *
233 * We are resilvering iff:
234 * 1) We are a replacing vdev (ie our name is "replacing-1" or
235 * "spare-1" or something like that), and
236 * 2) The pool is currently being resilvered.
237 *
238 * We cannot simply check vd->vdev_resilver_txg, because it's
239 * not set in this path.
240 *
241 * Nor can we just check our vdev_ops; there are cases (such as
242 * when a user types "zpool replace pool odev spare_dev" and
243 * spare_dev is in the spare list, or when a spare device is
244 * automatically used to replace a DEGRADED device) when
245 * resilvering is complete but both the original vdev and the
246 * spare vdev remain in the pool. That behavior is intentional.
247 * It helps implement the policy that a spare should be
248 * automatically removed from the pool after the user replaces
249 * the device that originally failed.
250 *
251 * If a spa load is in progress, then spa_dsl_pool may be
252 * uninitialized. But we shouldn't be resilvering during a spa
253 * load anyway.
254 */
255 boolean_t replacing = (vd->vdev_ops == &vdev_replacing_ops ||
256 vd->vdev_ops == &vdev_spare_ops) &&
257 spa_load_state(vd->vdev_spa) == SPA_LOAD_NONE &&
258 dsl_scan_resilvering(vd->vdev_spa->spa_dsl_pool);
259 mm = vdev_mirror_map_alloc(vd->vdev_children, replacing,
260 B_FALSE);
261 for (c = 0; c < mm->mm_children; c++) {
262 mc = &mm->mm_child[c];
263 mc->mc_vd = vd->vdev_child[c];
264 mc->mc_offset = zio->io_offset;
265 }
266 }
267
268 zio->io_vsd = mm;
269 zio->io_vsd_ops = &vdev_mirror_vsd_ops;
270 return (mm);
271 }
272
273 static int
vdev_mirror_open(vdev_t * vd,uint64_t * asize,uint64_t * max_asize,uint64_t * logical_ashift,uint64_t * physical_ashift)274 vdev_mirror_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize,
275 uint64_t *logical_ashift, uint64_t *physical_ashift)
276 {
277 int numerrors = 0;
278 int lasterror = 0;
279
280 if (vd->vdev_children == 0) {
281 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
282 return (SET_ERROR(EINVAL));
283 }
284
285 vdev_open_children(vd);
286
287 for (int c = 0; c < vd->vdev_children; c++) {
288 vdev_t *cvd = vd->vdev_child[c];
289
290 if (cvd->vdev_open_error) {
291 lasterror = cvd->vdev_open_error;
292 numerrors++;
293 continue;
294 }
295
296 *asize = MIN(*asize - 1, cvd->vdev_asize - 1) + 1;
297 *max_asize = MIN(*max_asize - 1, cvd->vdev_max_asize - 1) + 1;
298 *logical_ashift = MAX(*logical_ashift, cvd->vdev_ashift);
299 *physical_ashift = MAX(*physical_ashift,
300 cvd->vdev_physical_ashift);
301 }
302
303 if (numerrors == vd->vdev_children) {
304 vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
305 return (lasterror);
306 }
307
308 return (0);
309 }
310
311 static void
vdev_mirror_close(vdev_t * vd)312 vdev_mirror_close(vdev_t *vd)
313 {
314 for (int c = 0; c < vd->vdev_children; c++)
315 vdev_close(vd->vdev_child[c]);
316 }
317
318 static void
vdev_mirror_child_done(zio_t * zio)319 vdev_mirror_child_done(zio_t *zio)
320 {
321 mirror_child_t *mc = zio->io_private;
322
323 mc->mc_error = zio->io_error;
324 mc->mc_tried = 1;
325 mc->mc_skipped = 0;
326 }
327
328 static void
vdev_mirror_scrub_done(zio_t * zio)329 vdev_mirror_scrub_done(zio_t *zio)
330 {
331 mirror_child_t *mc = zio->io_private;
332
333 if (zio->io_error == 0) {
334 zio_t *pio;
335 zio_link_t *zl = NULL;
336
337 mutex_enter(&zio->io_lock);
338 while ((pio = zio_walk_parents(zio, &zl)) != NULL) {
339 mutex_enter(&pio->io_lock);
340 ASSERT3U(zio->io_size, >=, pio->io_size);
341 bcopy(zio->io_data, pio->io_data, pio->io_size);
342 mutex_exit(&pio->io_lock);
343 }
344 mutex_exit(&zio->io_lock);
345 }
346
347 zio_buf_free(zio->io_data, zio->io_size);
348
349 mc->mc_error = zio->io_error;
350 mc->mc_tried = 1;
351 mc->mc_skipped = 0;
352 }
353
354 /*
355 * Check the other, lower-index DVAs to see if they're on the same
356 * vdev as the child we picked. If they are, use them since they
357 * are likely to have been allocated from the primary metaslab in
358 * use at the time, and hence are more likely to have locality with
359 * single-copy data.
360 */
361 static int
vdev_mirror_dva_select(zio_t * zio,int p)362 vdev_mirror_dva_select(zio_t *zio, int p)
363 {
364 dva_t *dva = zio->io_bp->blk_dva;
365 mirror_map_t *mm = zio->io_vsd;
366 int preferred;
367 int c;
368
369 preferred = mm->mm_preferred[p];
370 for (p-- ; p >= 0; p--) {
371 c = mm->mm_preferred[p];
372 if (DVA_GET_VDEV(&dva[c]) == DVA_GET_VDEV(&dva[preferred]))
373 preferred = c;
374 }
375 return (preferred);
376 }
377
378 static int
vdev_mirror_preferred_child_randomize(zio_t * zio)379 vdev_mirror_preferred_child_randomize(zio_t *zio)
380 {
381 mirror_map_t *mm = zio->io_vsd;
382 int p;
383
384 if (mm->mm_root) {
385 p = spa_get_random(mm->mm_preferred_cnt);
386 return (vdev_mirror_dva_select(zio, p));
387 }
388
389 /*
390 * To ensure we don't always favour the first matching vdev,
391 * which could lead to wear leveling issues on SSD's, we
392 * use the I/O offset as a pseudo random seed into the vdevs
393 * which have the lowest load.
394 */
395 p = (zio->io_offset >> vdev_mirror_shift) % mm->mm_preferred_cnt;
396 return (mm->mm_preferred[p]);
397 }
398
399 /*
400 * Try to find a vdev whose DTL doesn't contain the block we want to read
401 * prefering vdevs based on determined load.
402 *
403 * If we can't, try the read on any vdev we haven't already tried.
404 */
405 static int
vdev_mirror_child_select(zio_t * zio)406 vdev_mirror_child_select(zio_t *zio)
407 {
408 mirror_map_t *mm = zio->io_vsd;
409 uint64_t txg = zio->io_txg;
410 int c, lowest_load;
411
412 ASSERT(zio->io_bp == NULL || BP_PHYSICAL_BIRTH(zio->io_bp) == txg);
413
414 lowest_load = INT_MAX;
415 mm->mm_preferred_cnt = 0;
416 for (c = 0; c < mm->mm_children; c++) {
417 mirror_child_t *mc;
418
419 mc = &mm->mm_child[c];
420 if (mc->mc_tried || mc->mc_skipped)
421 continue;
422
423 if (!vdev_readable(mc->mc_vd)) {
424 mc->mc_error = SET_ERROR(ENXIO);
425 mc->mc_tried = 1; /* don't even try */
426 mc->mc_skipped = 1;
427 continue;
428 }
429
430 if (vdev_dtl_contains(mc->mc_vd, DTL_MISSING, txg, 1)) {
431 mc->mc_error = SET_ERROR(ESTALE);
432 mc->mc_skipped = 1;
433 mc->mc_speculative = 1;
434 continue;
435 }
436
437 mc->mc_load = vdev_mirror_load(mm, mc->mc_vd, mc->mc_offset);
438 if (mc->mc_load > lowest_load)
439 continue;
440
441 if (mc->mc_load < lowest_load) {
442 lowest_load = mc->mc_load;
443 mm->mm_preferred_cnt = 0;
444 }
445 mm->mm_preferred[mm->mm_preferred_cnt] = c;
446 mm->mm_preferred_cnt++;
447 }
448
449 if (mm->mm_preferred_cnt == 1) {
450 vdev_queue_register_lastoffset(
451 mm->mm_child[mm->mm_preferred[0]].mc_vd, zio);
452 return (mm->mm_preferred[0]);
453 }
454
455 if (mm->mm_preferred_cnt > 1) {
456 int c = vdev_mirror_preferred_child_randomize(zio);
457
458 vdev_queue_register_lastoffset(mm->mm_child[c].mc_vd, zio);
459 return (c);
460 }
461
462 /*
463 * Every device is either missing or has this txg in its DTL.
464 * Look for any child we haven't already tried before giving up.
465 */
466 for (c = 0; c < mm->mm_children; c++) {
467 if (!mm->mm_child[c].mc_tried) {
468 vdev_queue_register_lastoffset(mm->mm_child[c].mc_vd,
469 zio);
470 return (c);
471 }
472 }
473
474 /*
475 * Every child failed. There's no place left to look.
476 */
477 return (-1);
478 }
479
480 static void
vdev_mirror_io_start(zio_t * zio)481 vdev_mirror_io_start(zio_t *zio)
482 {
483 mirror_map_t *mm;
484 mirror_child_t *mc;
485 int c, children;
486
487 mm = vdev_mirror_map_init(zio);
488
489 if (zio->io_type == ZIO_TYPE_READ) {
490 if ((zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_resilvering &&
491 mm->mm_children > 1) {
492 /*
493 * For scrubbing reads we need to allocate a read
494 * buffer for each child and issue reads to all
495 * children. If any child succeeds, it will copy its
496 * data into zio->io_data in vdev_mirror_scrub_done.
497 */
498 for (c = 0; c < mm->mm_children; c++) {
499 mc = &mm->mm_child[c];
500 zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
501 mc->mc_vd, mc->mc_offset,
502 zio_buf_alloc(zio->io_size), zio->io_size,
503 zio->io_type, zio->io_priority, 0,
504 vdev_mirror_scrub_done, mc));
505 }
506 zio_execute(zio);
507 return;
508 }
509 /*
510 * For normal reads just pick one child.
511 */
512 c = vdev_mirror_child_select(zio);
513 children = (c >= 0);
514 } else {
515 ASSERT(zio->io_type == ZIO_TYPE_WRITE ||
516 zio->io_type == ZIO_TYPE_FREE);
517
518 /*
519 * Writes and frees go to all children.
520 */
521 c = 0;
522 children = mm->mm_children;
523 }
524
525 while (children--) {
526 mc = &mm->mm_child[c];
527 zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
528 mc->mc_vd, mc->mc_offset, zio->io_data, zio->io_size,
529 zio->io_type, zio->io_priority, 0,
530 vdev_mirror_child_done, mc));
531 c++;
532 }
533
534 zio_execute(zio);
535 }
536
537 static int
vdev_mirror_worst_error(mirror_map_t * mm)538 vdev_mirror_worst_error(mirror_map_t *mm)
539 {
540 int error[2] = { 0, 0 };
541
542 for (int c = 0; c < mm->mm_children; c++) {
543 mirror_child_t *mc = &mm->mm_child[c];
544 int s = mc->mc_speculative;
545 error[s] = zio_worst_error(error[s], mc->mc_error);
546 }
547
548 return (error[0] ? error[0] : error[1]);
549 }
550
551 static void
vdev_mirror_io_done(zio_t * zio)552 vdev_mirror_io_done(zio_t *zio)
553 {
554 mirror_map_t *mm = zio->io_vsd;
555 mirror_child_t *mc;
556 int c;
557 int good_copies = 0;
558 int unexpected_errors = 0;
559
560 for (c = 0; c < mm->mm_children; c++) {
561 mc = &mm->mm_child[c];
562
563 if (mc->mc_error) {
564 if (!mc->mc_skipped)
565 unexpected_errors++;
566 } else if (mc->mc_tried) {
567 good_copies++;
568 }
569 }
570
571 if (zio->io_type == ZIO_TYPE_WRITE) {
572 /*
573 * XXX -- for now, treat partial writes as success.
574 *
575 * Now that we support write reallocation, it would be better
576 * to treat partial failure as real failure unless there are
577 * no non-degraded top-level vdevs left, and not update DTLs
578 * if we intend to reallocate.
579 */
580 /* XXPOLICY */
581 if (good_copies != mm->mm_children) {
582 /*
583 * Always require at least one good copy.
584 *
585 * For ditto blocks (io_vd == NULL), require
586 * all copies to be good.
587 *
588 * XXX -- for replacing vdevs, there's no great answer.
589 * If the old device is really dead, we may not even
590 * be able to access it -- so we only want to
591 * require good writes to the new device. But if
592 * the new device turns out to be flaky, we want
593 * to be able to detach it -- which requires all
594 * writes to the old device to have succeeded.
595 */
596 if (good_copies == 0 || zio->io_vd == NULL)
597 zio->io_error = vdev_mirror_worst_error(mm);
598 }
599 return;
600 } else if (zio->io_type == ZIO_TYPE_FREE) {
601 return;
602 }
603
604 ASSERT(zio->io_type == ZIO_TYPE_READ);
605
606 /*
607 * If we don't have a good copy yet, keep trying other children.
608 */
609 /* XXPOLICY */
610 if (good_copies == 0 && (c = vdev_mirror_child_select(zio)) != -1) {
611 ASSERT(c >= 0 && c < mm->mm_children);
612 mc = &mm->mm_child[c];
613 zio_vdev_io_redone(zio);
614 zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
615 mc->mc_vd, mc->mc_offset, zio->io_data, zio->io_size,
616 ZIO_TYPE_READ, zio->io_priority, 0,
617 vdev_mirror_child_done, mc));
618 return;
619 }
620
621 /* XXPOLICY */
622 if (good_copies == 0) {
623 zio->io_error = vdev_mirror_worst_error(mm);
624 ASSERT(zio->io_error != 0);
625 }
626
627 if (good_copies && spa_writeable(zio->io_spa) &&
628 (unexpected_errors ||
629 (zio->io_flags & ZIO_FLAG_RESILVER) ||
630 ((zio->io_flags & ZIO_FLAG_SCRUB) && mm->mm_resilvering))) {
631 /*
632 * Use the good data we have in hand to repair damaged children.
633 */
634 for (c = 0; c < mm->mm_children; c++) {
635 /*
636 * Don't rewrite known good children.
637 * Not only is it unnecessary, it could
638 * actually be harmful: if the system lost
639 * power while rewriting the only good copy,
640 * there would be no good copies left!
641 */
642 mc = &mm->mm_child[c];
643
644 if (mc->mc_error == 0) {
645 if (mc->mc_tried)
646 continue;
647 if (!(zio->io_flags & ZIO_FLAG_SCRUB) &&
648 !vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
649 zio->io_txg, 1))
650 continue;
651 mc->mc_error = SET_ERROR(ESTALE);
652 }
653
654 zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
655 mc->mc_vd, mc->mc_offset,
656 zio->io_data, zio->io_size,
657 ZIO_TYPE_WRITE, ZIO_PRIORITY_ASYNC_WRITE,
658 ZIO_FLAG_IO_REPAIR | (unexpected_errors ?
659 ZIO_FLAG_SELF_HEAL : 0), NULL, NULL));
660 }
661 }
662 }
663
664 static void
vdev_mirror_state_change(vdev_t * vd,int faulted,int degraded)665 vdev_mirror_state_change(vdev_t *vd, int faulted, int degraded)
666 {
667 if (faulted == vd->vdev_children)
668 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
669 VDEV_AUX_NO_REPLICAS);
670 else if (degraded + faulted != 0)
671 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
672 else
673 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
674 }
675
676 vdev_ops_t vdev_mirror_ops = {
677 vdev_mirror_open,
678 vdev_mirror_close,
679 vdev_default_asize,
680 vdev_mirror_io_start,
681 vdev_mirror_io_done,
682 vdev_mirror_state_change,
683 NULL,
684 NULL,
685 VDEV_TYPE_MIRROR, /* name of this vdev type */
686 B_FALSE /* not a leaf vdev */
687 };
688
689 vdev_ops_t vdev_replacing_ops = {
690 vdev_mirror_open,
691 vdev_mirror_close,
692 vdev_default_asize,
693 vdev_mirror_io_start,
694 vdev_mirror_io_done,
695 vdev_mirror_state_change,
696 NULL,
697 NULL,
698 VDEV_TYPE_REPLACING, /* name of this vdev type */
699 B_FALSE /* not a leaf vdev */
700 };
701
702 vdev_ops_t vdev_spare_ops = {
703 vdev_mirror_open,
704 vdev_mirror_close,
705 vdev_default_asize,
706 vdev_mirror_io_start,
707 vdev_mirror_io_done,
708 vdev_mirror_state_change,
709 NULL,
710 NULL,
711 VDEV_TYPE_SPARE, /* name of this vdev type */
712 B_FALSE /* not a leaf vdev */
713 };
714