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.
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.
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]
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 #include <sys/zfs_context.h>
28 #include <sys/fm/fs/zfs.h>
30 #include <sys/spa_impl.h>
32 #include <sys/dmu_tx.h>
33 #include <sys/vdev_impl.h>
34 #include <sys/uberblock_impl.h>
35 #include <sys/metaslab.h>
36 #include <sys/metaslab_impl.h>
37 #include <sys/space_map.h>
40 #include <sys/fs/zfs.h>
44 * Virtual device management.
47 static vdev_ops_t
*vdev_ops_table
[] = {
59 /* maximum scrub/resilver I/O queue per leaf vdev */
60 int zfs_scrub_limit
= 10;
63 * Given a vdev type, return the appropriate ops vector.
66 vdev_getops(const char *type
)
68 vdev_ops_t
*ops
, **opspp
;
70 for (opspp
= vdev_ops_table
; (ops
= *opspp
) != NULL
; opspp
++)
71 if (strcmp(ops
->vdev_op_type
, type
) == 0)
78 * Default asize function: return the MAX of psize with the asize of
79 * all children. This is what's used by anything other than RAID-Z.
82 vdev_default_asize(vdev_t
*vd
, uint64_t psize
)
84 uint64_t asize
= P2ROUNDUP(psize
, 1ULL << vd
->vdev_top
->vdev_ashift
);
88 for (c
= 0; c
< vd
->vdev_children
; c
++) {
89 csize
= vdev_psize_to_asize(vd
->vdev_child
[c
], psize
);
90 asize
= MAX(asize
, csize
);
97 * Get the replaceable or attachable device size.
98 * If the parent is a mirror or raidz, the replaceable size is the minimum
99 * psize of all its children. For the rest, just return our own psize.
110 vdev_get_rsize(vdev_t
*vd
)
115 pvd
= vd
->vdev_parent
;
118 * If our parent is NULL or the root, just return our own psize.
120 if (pvd
== NULL
|| pvd
->vdev_parent
== NULL
)
121 return (vd
->vdev_psize
);
125 for (c
= 0; c
< pvd
->vdev_children
; c
++) {
126 cvd
= pvd
->vdev_child
[c
];
127 rsize
= MIN(rsize
- 1, cvd
->vdev_psize
- 1) + 1;
134 vdev_lookup_top(spa_t
*spa
, uint64_t vdev
)
136 vdev_t
*rvd
= spa
->spa_root_vdev
;
138 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
140 if (vdev
< rvd
->vdev_children
) {
141 ASSERT(rvd
->vdev_child
[vdev
] != NULL
);
142 return (rvd
->vdev_child
[vdev
]);
149 vdev_lookup_by_guid(vdev_t
*vd
, uint64_t guid
)
154 if (vd
->vdev_guid
== guid
)
157 for (c
= 0; c
< vd
->vdev_children
; c
++)
158 if ((mvd
= vdev_lookup_by_guid(vd
->vdev_child
[c
], guid
)) !=
166 vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
)
168 size_t oldsize
, newsize
;
169 uint64_t id
= cvd
->vdev_id
;
172 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
173 ASSERT(cvd
->vdev_parent
== NULL
);
175 cvd
->vdev_parent
= pvd
;
180 ASSERT(id
>= pvd
->vdev_children
|| pvd
->vdev_child
[id
] == NULL
);
182 oldsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
183 pvd
->vdev_children
= MAX(pvd
->vdev_children
, id
+ 1);
184 newsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
186 newchild
= kmem_zalloc(newsize
, KM_SLEEP
);
187 if (pvd
->vdev_child
!= NULL
) {
188 bcopy(pvd
->vdev_child
, newchild
, oldsize
);
189 kmem_free(pvd
->vdev_child
, oldsize
);
192 pvd
->vdev_child
= newchild
;
193 pvd
->vdev_child
[id
] = cvd
;
195 cvd
->vdev_top
= (pvd
->vdev_top
? pvd
->vdev_top
: cvd
);
196 ASSERT(cvd
->vdev_top
->vdev_parent
->vdev_parent
== NULL
);
199 * Walk up all ancestors to update guid sum.
201 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
202 pvd
->vdev_guid_sum
+= cvd
->vdev_guid_sum
;
204 if (cvd
->vdev_ops
->vdev_op_leaf
)
205 cvd
->vdev_spa
->spa_scrub_maxinflight
+= zfs_scrub_limit
;
209 vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
)
212 uint_t id
= cvd
->vdev_id
;
214 ASSERT(cvd
->vdev_parent
== pvd
);
219 ASSERT(id
< pvd
->vdev_children
);
220 ASSERT(pvd
->vdev_child
[id
] == cvd
);
222 pvd
->vdev_child
[id
] = NULL
;
223 cvd
->vdev_parent
= NULL
;
225 for (c
= 0; c
< pvd
->vdev_children
; c
++)
226 if (pvd
->vdev_child
[c
])
229 if (c
== pvd
->vdev_children
) {
230 kmem_free(pvd
->vdev_child
, c
* sizeof (vdev_t
*));
231 pvd
->vdev_child
= NULL
;
232 pvd
->vdev_children
= 0;
236 * Walk up all ancestors to update guid sum.
238 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
239 pvd
->vdev_guid_sum
-= cvd
->vdev_guid_sum
;
241 if (cvd
->vdev_ops
->vdev_op_leaf
)
242 cvd
->vdev_spa
->spa_scrub_maxinflight
-= zfs_scrub_limit
;
246 * Remove any holes in the child array.
249 vdev_compact_children(vdev_t
*pvd
)
251 vdev_t
**newchild
, *cvd
;
252 int oldc
= pvd
->vdev_children
;
255 ASSERT(spa_config_held(pvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
257 for (c
= newc
= 0; c
< oldc
; c
++)
258 if (pvd
->vdev_child
[c
])
261 newchild
= kmem_alloc(newc
* sizeof (vdev_t
*), KM_SLEEP
);
263 for (c
= newc
= 0; c
< oldc
; c
++) {
264 if ((cvd
= pvd
->vdev_child
[c
]) != NULL
) {
265 newchild
[newc
] = cvd
;
266 cvd
->vdev_id
= newc
++;
270 kmem_free(pvd
->vdev_child
, oldc
* sizeof (vdev_t
*));
271 pvd
->vdev_child
= newchild
;
272 pvd
->vdev_children
= newc
;
276 * Allocate and minimally initialize a vdev_t.
279 vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
, vdev_ops_t
*ops
)
283 vd
= kmem_zalloc(sizeof (vdev_t
), KM_SLEEP
);
285 if (spa
->spa_root_vdev
== NULL
) {
286 ASSERT(ops
== &vdev_root_ops
);
287 spa
->spa_root_vdev
= vd
;
291 if (spa
->spa_root_vdev
== vd
) {
293 * The root vdev's guid will also be the pool guid,
294 * which must be unique among all pools.
296 while (guid
== 0 || spa_guid_exists(guid
, 0))
297 guid
= spa_get_random(-1ULL);
300 * Any other vdev's guid must be unique within the pool.
303 spa_guid_exists(spa_guid(spa
), guid
))
304 guid
= spa_get_random(-1ULL);
306 ASSERT(!spa_guid_exists(spa_guid(spa
), guid
));
311 vd
->vdev_guid
= guid
;
312 vd
->vdev_guid_sum
= guid
;
314 vd
->vdev_state
= VDEV_STATE_CLOSED
;
316 mutex_init(&vd
->vdev_dtl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
317 mutex_init(&vd
->vdev_stat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
318 mutex_init(&vd
->vdev_probe_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
319 for (int t
= 0; t
< DTL_TYPES
; t
++) {
320 space_map_create(&vd
->vdev_dtl
[t
], 0, -1ULL, 0,
323 txg_list_create(&vd
->vdev_ms_list
,
324 offsetof(struct metaslab
, ms_txg_node
));
325 txg_list_create(&vd
->vdev_dtl_list
,
326 offsetof(struct vdev
, vdev_dtl_node
));
327 vd
->vdev_stat
.vs_timestamp
= gethrtime();
335 * Allocate a new vdev. The 'alloctype' is used to control whether we are
336 * creating a new vdev or loading an existing one - the behavior is slightly
337 * different for each case.
340 vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*nv
, vdev_t
*parent
, uint_t id
,
345 uint64_t guid
= 0, islog
, nparity
;
348 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
350 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_TYPE
, &type
) != 0)
353 if ((ops
= vdev_getops(type
)) == NULL
)
357 * If this is a load, get the vdev guid from the nvlist.
358 * Otherwise, vdev_alloc_common() will generate one for us.
360 if (alloctype
== VDEV_ALLOC_LOAD
) {
363 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ID
, &label_id
) ||
367 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
369 } else if (alloctype
== VDEV_ALLOC_SPARE
) {
370 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
372 } else if (alloctype
== VDEV_ALLOC_L2CACHE
) {
373 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
378 * The first allocated vdev must be of type 'root'.
380 if (ops
!= &vdev_root_ops
&& spa
->spa_root_vdev
== NULL
)
384 * Determine whether we're a log vdev.
387 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_LOG
, &islog
);
388 if (islog
&& spa_version(spa
) < SPA_VERSION_SLOGS
)
392 * Set the nparity property for RAID-Z vdevs.
395 if (ops
== &vdev_raidz_ops
) {
396 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NPARITY
,
399 * Currently, we can only support 2 parity devices.
401 if (nparity
== 0 || nparity
> 2)
404 * Older versions can only support 1 parity device.
407 spa_version(spa
) < SPA_VERSION_RAID6
)
411 * We require the parity to be specified for SPAs that
412 * support multiple parity levels.
414 if (spa_version(spa
) >= SPA_VERSION_RAID6
)
417 * Otherwise, we default to 1 parity device for RAID-Z.
424 ASSERT(nparity
!= -1ULL);
426 vd
= vdev_alloc_common(spa
, id
, guid
, ops
);
428 vd
->vdev_islog
= islog
;
429 vd
->vdev_nparity
= nparity
;
431 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
, &vd
->vdev_path
) == 0)
432 vd
->vdev_path
= spa_strdup(vd
->vdev_path
);
433 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_DEVID
, &vd
->vdev_devid
) == 0)
434 vd
->vdev_devid
= spa_strdup(vd
->vdev_devid
);
435 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PHYS_PATH
,
436 &vd
->vdev_physpath
) == 0)
437 vd
->vdev_physpath
= spa_strdup(vd
->vdev_physpath
);
440 * Set the whole_disk property. If it's not specified, leave the value
443 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_WHOLE_DISK
,
444 &vd
->vdev_wholedisk
) != 0)
445 vd
->vdev_wholedisk
= -1ULL;
448 * Look for the 'not present' flag. This will only be set if the device
449 * was not present at the time of import.
451 if (!spa
->spa_import_faulted
)
452 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NOT_PRESENT
,
453 &vd
->vdev_not_present
);
456 * Get the alignment requirement.
458 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASHIFT
, &vd
->vdev_ashift
);
461 * If we're a top-level vdev, try to load the allocation parameters.
463 if (parent
&& !parent
->vdev_parent
&& alloctype
== VDEV_ALLOC_LOAD
) {
464 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_ARRAY
,
466 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_SHIFT
,
468 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASIZE
,
473 * If we're a leaf vdev, try to load the DTL object and other state.
475 if (vd
->vdev_ops
->vdev_op_leaf
&&
476 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_L2CACHE
)) {
477 if (alloctype
== VDEV_ALLOC_LOAD
) {
478 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DTL
,
479 &vd
->vdev_dtl_smo
.smo_object
);
480 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_UNSPARE
,
483 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_OFFLINE
,
487 * When importing a pool, we want to ignore the persistent fault
488 * state, as the diagnosis made on another system may not be
489 * valid in the current context.
491 if (spa
->spa_load_state
== SPA_LOAD_OPEN
) {
492 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_FAULTED
,
494 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DEGRADED
,
496 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVED
,
502 * Add ourselves to the parent's list of children.
504 vdev_add_child(parent
, vd
);
512 vdev_free(vdev_t
*vd
)
515 spa_t
*spa
= vd
->vdev_spa
;
518 * vdev_free() implies closing the vdev first. This is simpler than
519 * trying to ensure complicated semantics for all callers.
523 ASSERT(!list_link_active(&vd
->vdev_config_dirty_node
));
528 for (c
= 0; c
< vd
->vdev_children
; c
++)
529 vdev_free(vd
->vdev_child
[c
]);
531 ASSERT(vd
->vdev_child
== NULL
);
532 ASSERT(vd
->vdev_guid_sum
== vd
->vdev_guid
);
535 * Discard allocation state.
537 if (vd
== vd
->vdev_top
)
538 vdev_metaslab_fini(vd
);
540 ASSERT3U(vd
->vdev_stat
.vs_space
, ==, 0);
541 ASSERT3U(vd
->vdev_stat
.vs_dspace
, ==, 0);
542 ASSERT3U(vd
->vdev_stat
.vs_alloc
, ==, 0);
545 * Remove this vdev from its parent's child list.
547 vdev_remove_child(vd
->vdev_parent
, vd
);
549 ASSERT(vd
->vdev_parent
== NULL
);
552 * Clean up vdev structure.
558 spa_strfree(vd
->vdev_path
);
560 spa_strfree(vd
->vdev_devid
);
561 if (vd
->vdev_physpath
)
562 spa_strfree(vd
->vdev_physpath
);
564 if (vd
->vdev_isspare
)
565 spa_spare_remove(vd
);
566 if (vd
->vdev_isl2cache
)
567 spa_l2cache_remove(vd
);
569 txg_list_destroy(&vd
->vdev_ms_list
);
570 txg_list_destroy(&vd
->vdev_dtl_list
);
572 mutex_enter(&vd
->vdev_dtl_lock
);
573 for (int t
= 0; t
< DTL_TYPES
; t
++) {
574 space_map_unload(&vd
->vdev_dtl
[t
]);
575 space_map_destroy(&vd
->vdev_dtl
[t
]);
577 mutex_exit(&vd
->vdev_dtl_lock
);
579 mutex_destroy(&vd
->vdev_dtl_lock
);
580 mutex_destroy(&vd
->vdev_stat_lock
);
581 mutex_destroy(&vd
->vdev_probe_lock
);
583 if (vd
== spa
->spa_root_vdev
)
584 spa
->spa_root_vdev
= NULL
;
586 kmem_free(vd
, sizeof (vdev_t
));
590 * Transfer top-level vdev state from svd to tvd.
593 vdev_top_transfer(vdev_t
*svd
, vdev_t
*tvd
)
595 spa_t
*spa
= svd
->vdev_spa
;
600 ASSERT(tvd
== tvd
->vdev_top
);
602 tvd
->vdev_ms_array
= svd
->vdev_ms_array
;
603 tvd
->vdev_ms_shift
= svd
->vdev_ms_shift
;
604 tvd
->vdev_ms_count
= svd
->vdev_ms_count
;
606 svd
->vdev_ms_array
= 0;
607 svd
->vdev_ms_shift
= 0;
608 svd
->vdev_ms_count
= 0;
610 tvd
->vdev_mg
= svd
->vdev_mg
;
611 tvd
->vdev_ms
= svd
->vdev_ms
;
616 if (tvd
->vdev_mg
!= NULL
)
617 tvd
->vdev_mg
->mg_vd
= tvd
;
619 tvd
->vdev_stat
.vs_alloc
= svd
->vdev_stat
.vs_alloc
;
620 tvd
->vdev_stat
.vs_space
= svd
->vdev_stat
.vs_space
;
621 tvd
->vdev_stat
.vs_dspace
= svd
->vdev_stat
.vs_dspace
;
623 svd
->vdev_stat
.vs_alloc
= 0;
624 svd
->vdev_stat
.vs_space
= 0;
625 svd
->vdev_stat
.vs_dspace
= 0;
627 for (t
= 0; t
< TXG_SIZE
; t
++) {
628 while ((msp
= txg_list_remove(&svd
->vdev_ms_list
, t
)) != NULL
)
629 (void) txg_list_add(&tvd
->vdev_ms_list
, msp
, t
);
630 while ((vd
= txg_list_remove(&svd
->vdev_dtl_list
, t
)) != NULL
)
631 (void) txg_list_add(&tvd
->vdev_dtl_list
, vd
, t
);
632 if (txg_list_remove_this(&spa
->spa_vdev_txg_list
, svd
, t
))
633 (void) txg_list_add(&spa
->spa_vdev_txg_list
, tvd
, t
);
636 if (list_link_active(&svd
->vdev_config_dirty_node
)) {
637 vdev_config_clean(svd
);
638 vdev_config_dirty(tvd
);
641 if (list_link_active(&svd
->vdev_state_dirty_node
)) {
642 vdev_state_clean(svd
);
643 vdev_state_dirty(tvd
);
646 tvd
->vdev_deflate_ratio
= svd
->vdev_deflate_ratio
;
647 svd
->vdev_deflate_ratio
= 0;
649 tvd
->vdev_islog
= svd
->vdev_islog
;
654 vdev_top_update(vdev_t
*tvd
, vdev_t
*vd
)
663 for (c
= 0; c
< vd
->vdev_children
; c
++)
664 vdev_top_update(tvd
, vd
->vdev_child
[c
]);
668 * Add a mirror/replacing vdev above an existing vdev.
671 vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
)
673 spa_t
*spa
= cvd
->vdev_spa
;
674 vdev_t
*pvd
= cvd
->vdev_parent
;
677 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
679 mvd
= vdev_alloc_common(spa
, cvd
->vdev_id
, 0, ops
);
681 mvd
->vdev_asize
= cvd
->vdev_asize
;
682 mvd
->vdev_ashift
= cvd
->vdev_ashift
;
683 mvd
->vdev_state
= cvd
->vdev_state
;
685 vdev_remove_child(pvd
, cvd
);
686 vdev_add_child(pvd
, mvd
);
687 cvd
->vdev_id
= mvd
->vdev_children
;
688 vdev_add_child(mvd
, cvd
);
689 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
691 if (mvd
== mvd
->vdev_top
)
692 vdev_top_transfer(cvd
, mvd
);
698 * Remove a 1-way mirror/replacing vdev from the tree.
701 vdev_remove_parent(vdev_t
*cvd
)
703 vdev_t
*mvd
= cvd
->vdev_parent
;
704 vdev_t
*pvd
= mvd
->vdev_parent
;
706 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
708 ASSERT(mvd
->vdev_children
== 1);
709 ASSERT(mvd
->vdev_ops
== &vdev_mirror_ops
||
710 mvd
->vdev_ops
== &vdev_replacing_ops
||
711 mvd
->vdev_ops
== &vdev_spare_ops
);
712 cvd
->vdev_ashift
= mvd
->vdev_ashift
;
714 vdev_remove_child(mvd
, cvd
);
715 vdev_remove_child(pvd
, mvd
);
718 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
719 * Otherwise, we could have detached an offline device, and when we
720 * go to import the pool we'll think we have two top-level vdevs,
721 * instead of a different version of the same top-level vdev.
723 if (mvd
->vdev_top
== mvd
) {
724 uint64_t guid_delta
= mvd
->vdev_guid
- cvd
->vdev_guid
;
725 cvd
->vdev_guid
+= guid_delta
;
726 cvd
->vdev_guid_sum
+= guid_delta
;
728 cvd
->vdev_id
= mvd
->vdev_id
;
729 vdev_add_child(pvd
, cvd
);
730 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
732 if (cvd
== cvd
->vdev_top
)
733 vdev_top_transfer(mvd
, cvd
);
735 ASSERT(mvd
->vdev_children
== 0);
740 vdev_metaslab_init(vdev_t
*vd
, uint64_t txg
)
742 spa_t
*spa
= vd
->vdev_spa
;
743 objset_t
*mos
= spa
->spa_meta_objset
;
744 metaslab_class_t
*mc
;
746 uint64_t oldc
= vd
->vdev_ms_count
;
747 uint64_t newc
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
751 if (vd
->vdev_ms_shift
== 0) /* not being allocated from yet */
754 ASSERT(oldc
<= newc
);
757 mc
= spa
->spa_log_class
;
759 mc
= spa
->spa_normal_class
;
761 if (vd
->vdev_mg
== NULL
)
762 vd
->vdev_mg
= metaslab_group_create(mc
, vd
);
764 mspp
= kmem_zalloc(newc
* sizeof (*mspp
), KM_SLEEP
);
767 bcopy(vd
->vdev_ms
, mspp
, oldc
* sizeof (*mspp
));
768 kmem_free(vd
->vdev_ms
, oldc
* sizeof (*mspp
));
772 vd
->vdev_ms_count
= newc
;
774 for (m
= oldc
; m
< newc
; m
++) {
775 space_map_obj_t smo
= { 0, 0, 0 };
778 error
= dmu_read(mos
, vd
->vdev_ms_array
,
779 m
* sizeof (uint64_t), sizeof (uint64_t), &object
);
784 error
= dmu_bonus_hold(mos
, object
, FTAG
, &db
);
787 ASSERT3U(db
->db_size
, >=, sizeof (smo
));
788 bcopy(db
->db_data
, &smo
, sizeof (smo
));
789 ASSERT3U(smo
.smo_object
, ==, object
);
790 dmu_buf_rele(db
, FTAG
);
793 vd
->vdev_ms
[m
] = metaslab_init(vd
->vdev_mg
, &smo
,
794 m
<< vd
->vdev_ms_shift
, 1ULL << vd
->vdev_ms_shift
, txg
);
801 vdev_metaslab_fini(vdev_t
*vd
)
804 uint64_t count
= vd
->vdev_ms_count
;
806 if (vd
->vdev_ms
!= NULL
) {
807 for (m
= 0; m
< count
; m
++)
808 if (vd
->vdev_ms
[m
] != NULL
)
809 metaslab_fini(vd
->vdev_ms
[m
]);
810 kmem_free(vd
->vdev_ms
, count
* sizeof (metaslab_t
*));
815 typedef struct vdev_probe_stats
{
816 boolean_t vps_readable
;
817 boolean_t vps_writeable
;
821 } vdev_probe_stats_t
;
824 vdev_probe_done(zio_t
*zio
)
826 spa_t
*spa
= zio
->io_spa
;
827 vdev_probe_stats_t
*vps
= zio
->io_private
;
828 vdev_t
*vd
= vps
->vps_vd
;
830 if (zio
->io_type
== ZIO_TYPE_READ
) {
831 ASSERT(zio
->io_vd
== vd
);
832 if (zio
->io_error
== 0)
833 vps
->vps_readable
= 1;
834 if (zio
->io_error
== 0 && spa_writeable(spa
)) {
835 zio_nowait(zio_write_phys(vps
->vps_root
, vd
,
836 zio
->io_offset
, zio
->io_size
, zio
->io_data
,
837 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
838 ZIO_PRIORITY_SYNC_WRITE
, vps
->vps_flags
, B_TRUE
));
840 zio_buf_free(zio
->io_data
, zio
->io_size
);
842 } else if (zio
->io_type
== ZIO_TYPE_WRITE
) {
843 ASSERT(zio
->io_vd
== vd
);
844 if (zio
->io_error
== 0)
845 vps
->vps_writeable
= 1;
846 zio_buf_free(zio
->io_data
, zio
->io_size
);
847 } else if (zio
->io_type
== ZIO_TYPE_NULL
) {
848 ASSERT(zio
->io_vd
== NULL
);
849 ASSERT(zio
== vps
->vps_root
);
851 vd
->vdev_cant_read
|= !vps
->vps_readable
;
852 vd
->vdev_cant_write
|= !vps
->vps_writeable
;
854 if (vdev_readable(vd
) &&
855 (vdev_writeable(vd
) || !spa_writeable(spa
))) {
858 ASSERT(zio
->io_error
!= 0);
859 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE
,
860 spa
, vd
, NULL
, 0, 0);
861 zio
->io_error
= ENXIO
;
863 kmem_free(vps
, sizeof (*vps
));
868 * Determine whether this device is accessible by reading and writing
869 * to several known locations: the pad regions of each vdev label
870 * but the first (which we leave alone in case it contains a VTOC).
873 vdev_probe(vdev_t
*vd
, zio_t
*pio
)
875 spa_t
*spa
= vd
->vdev_spa
;
876 vdev_probe_stats_t
*vps
;
879 vps
= kmem_zalloc(sizeof (*vps
), KM_SLEEP
);
881 vps
->vps_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_PROBE
|
882 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
| ZIO_FLAG_DONT_RETRY
;
884 if (spa_config_held(spa
, SCL_ZIO
, RW_WRITER
)) {
886 * vdev_cant_read and vdev_cant_write can only transition
887 * from TRUE to FALSE when we have the SCL_ZIO lock as writer;
888 * otherwise they can only transition from FALSE to TRUE.
889 * This ensures that any zio looking at these values can
890 * assume that failures persist for the life of the I/O.
891 * That's important because when a device has intermittent
892 * connectivity problems, we want to ensure that they're
893 * ascribed to the device (ENXIO) and not the zio (EIO).
895 * Since we hold SCL_ZIO as writer here, clear both values
896 * so the probe can reevaluate from first principles.
898 vps
->vps_flags
|= ZIO_FLAG_CONFIG_WRITER
;
899 vd
->vdev_cant_read
= B_FALSE
;
900 vd
->vdev_cant_write
= B_FALSE
;
903 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
905 zio
= zio_null(pio
, spa
, vdev_probe_done
, vps
, vps
->vps_flags
);
910 for (int l
= 1; l
< VDEV_LABELS
; l
++) {
911 zio_nowait(zio_read_phys(zio
, vd
,
912 vdev_label_offset(vd
->vdev_psize
, l
,
913 offsetof(vdev_label_t
, vl_pad
)),
914 VDEV_SKIP_SIZE
, zio_buf_alloc(VDEV_SKIP_SIZE
),
915 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
916 ZIO_PRIORITY_SYNC_READ
, vps
->vps_flags
, B_TRUE
));
923 * Prepare a virtual device for access.
926 vdev_open(vdev_t
*vd
)
928 spa_t
*spa
= vd
->vdev_spa
;
932 uint64_t asize
, psize
;
935 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
937 ASSERT(vd
->vdev_state
== VDEV_STATE_CLOSED
||
938 vd
->vdev_state
== VDEV_STATE_CANT_OPEN
||
939 vd
->vdev_state
== VDEV_STATE_OFFLINE
);
941 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
943 if (!vd
->vdev_removed
&& vd
->vdev_faulted
) {
944 ASSERT(vd
->vdev_children
== 0);
945 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
946 VDEV_AUX_ERR_EXCEEDED
);
948 } else if (vd
->vdev_offline
) {
949 ASSERT(vd
->vdev_children
== 0);
950 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
, VDEV_AUX_NONE
);
954 error
= vd
->vdev_ops
->vdev_op_open(vd
, &osize
, &ashift
);
956 if (zio_injection_enabled
&& error
== 0)
957 error
= zio_handle_device_injection(vd
, ENXIO
);
960 if (vd
->vdev_removed
&&
961 vd
->vdev_stat
.vs_aux
!= VDEV_AUX_OPEN_FAILED
)
962 vd
->vdev_removed
= B_FALSE
;
964 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
965 vd
->vdev_stat
.vs_aux
);
969 vd
->vdev_removed
= B_FALSE
;
971 if (vd
->vdev_degraded
) {
972 ASSERT(vd
->vdev_children
== 0);
973 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
974 VDEV_AUX_ERR_EXCEEDED
);
976 vd
->vdev_state
= VDEV_STATE_HEALTHY
;
979 for (c
= 0; c
< vd
->vdev_children
; c
++)
980 if (vd
->vdev_child
[c
]->vdev_state
!= VDEV_STATE_HEALTHY
) {
981 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
986 osize
= P2ALIGN(osize
, (uint64_t)sizeof (vdev_label_t
));
988 if (vd
->vdev_children
== 0) {
989 if (osize
< SPA_MINDEVSIZE
) {
990 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
995 asize
= osize
- (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
);
997 if (vd
->vdev_parent
!= NULL
&& osize
< SPA_MINDEVSIZE
-
998 (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
)) {
999 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1000 VDEV_AUX_TOO_SMALL
);
1007 vd
->vdev_psize
= psize
;
1009 if (vd
->vdev_asize
== 0) {
1011 * This is the first-ever open, so use the computed values.
1012 * For testing purposes, a higher ashift can be requested.
1014 vd
->vdev_asize
= asize
;
1015 vd
->vdev_ashift
= MAX(ashift
, vd
->vdev_ashift
);
1018 * Make sure the alignment requirement hasn't increased.
1020 if (ashift
> vd
->vdev_top
->vdev_ashift
) {
1021 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1022 VDEV_AUX_BAD_LABEL
);
1027 * Make sure the device hasn't shrunk.
1029 if (asize
< vd
->vdev_asize
) {
1030 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1031 VDEV_AUX_BAD_LABEL
);
1036 * If all children are healthy and the asize has increased,
1037 * then we've experienced dynamic LUN growth.
1039 if (vd
->vdev_state
== VDEV_STATE_HEALTHY
&&
1040 asize
> vd
->vdev_asize
) {
1041 vd
->vdev_asize
= asize
;
1046 * Ensure we can issue some IO before declaring the
1047 * vdev open for business.
1049 if (vd
->vdev_ops
->vdev_op_leaf
&&
1050 (error
= zio_wait(vdev_probe(vd
, NULL
))) != 0) {
1051 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1052 VDEV_AUX_IO_FAILURE
);
1057 * If this is a top-level vdev, compute the raidz-deflation
1058 * ratio. Note, we hard-code in 128k (1<<17) because it is the
1059 * current "typical" blocksize. Even if SPA_MAXBLOCKSIZE
1060 * changes, this algorithm must never change, or we will
1061 * inconsistently account for existing bp's.
1063 if (vd
->vdev_top
== vd
) {
1064 vd
->vdev_deflate_ratio
= (1<<17) /
1065 (vdev_psize_to_asize(vd
, 1<<17) >> SPA_MINBLOCKSHIFT
);
1069 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1070 * resilver. But don't do this if we are doing a reopen for a scrub,
1071 * since this would just restart the scrub we are already doing.
1073 if (vd
->vdev_ops
->vdev_op_leaf
&& !spa
->spa_scrub_reopen
&&
1074 vdev_resilver_needed(vd
, NULL
, NULL
))
1075 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1081 * Called once the vdevs are all opened, this routine validates the label
1082 * contents. This needs to be done before vdev_load() so that we don't
1083 * inadvertently do repair I/Os to the wrong device.
1085 * This function will only return failure if one of the vdevs indicates that it
1086 * has since been destroyed or exported. This is only possible if
1087 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1088 * will be updated but the function will return 0.
1091 vdev_validate(vdev_t
*vd
)
1093 spa_t
*spa
= vd
->vdev_spa
;
1096 uint64_t guid
, top_guid
;
1099 for (c
= 0; c
< vd
->vdev_children
; c
++)
1100 if (vdev_validate(vd
->vdev_child
[c
]) != 0)
1104 * If the device has already failed, or was marked offline, don't do
1105 * any further validation. Otherwise, label I/O will fail and we will
1106 * overwrite the previous state.
1108 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_readable(vd
)) {
1110 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1111 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1112 VDEV_AUX_BAD_LABEL
);
1116 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_GUID
,
1117 &guid
) != 0 || guid
!= spa_guid(spa
)) {
1118 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1119 VDEV_AUX_CORRUPT_DATA
);
1125 * If this vdev just became a top-level vdev because its
1126 * sibling was detached, it will have adopted the parent's
1127 * vdev guid -- but the label may or may not be on disk yet.
1128 * Fortunately, either version of the label will have the
1129 * same top guid, so if we're a top-level vdev, we can
1130 * safely compare to that instead.
1132 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
,
1134 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_TOP_GUID
,
1136 (vd
->vdev_guid
!= guid
&&
1137 (vd
->vdev_guid
!= top_guid
|| vd
!= vd
->vdev_top
))) {
1138 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1139 VDEV_AUX_CORRUPT_DATA
);
1144 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
,
1146 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1147 VDEV_AUX_CORRUPT_DATA
);
1154 if (spa
->spa_load_state
== SPA_LOAD_OPEN
&&
1155 state
!= POOL_STATE_ACTIVE
)
1159 * If we were able to open and validate a vdev that was
1160 * previously marked permanently unavailable, clear that state
1163 if (vd
->vdev_not_present
)
1164 vd
->vdev_not_present
= 0;
1171 * Close a virtual device.
1174 vdev_close(vdev_t
*vd
)
1176 spa_t
*spa
= vd
->vdev_spa
;
1178 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1180 vd
->vdev_ops
->vdev_op_close(vd
);
1182 vdev_cache_purge(vd
);
1185 * We record the previous state before we close it, so that if we are
1186 * doing a reopen(), we don't generate FMA ereports if we notice that
1187 * it's still faulted.
1189 vd
->vdev_prevstate
= vd
->vdev_state
;
1191 if (vd
->vdev_offline
)
1192 vd
->vdev_state
= VDEV_STATE_OFFLINE
;
1194 vd
->vdev_state
= VDEV_STATE_CLOSED
;
1195 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1199 vdev_reopen(vdev_t
*vd
)
1201 spa_t
*spa
= vd
->vdev_spa
;
1203 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1206 (void) vdev_open(vd
);
1209 * Call vdev_validate() here to make sure we have the same device.
1210 * Otherwise, a device with an invalid label could be successfully
1211 * opened in response to vdev_reopen().
1214 (void) vdev_validate_aux(vd
);
1215 if (vdev_readable(vd
) && vdev_writeable(vd
) &&
1216 !l2arc_vdev_present(vd
)) {
1217 uint64_t size
= vdev_get_rsize(vd
);
1218 l2arc_add_vdev(spa
, vd
,
1219 VDEV_LABEL_START_SIZE
,
1220 size
- VDEV_LABEL_START_SIZE
);
1223 (void) vdev_validate(vd
);
1227 * Reassess parent vdev's health.
1229 vdev_propagate_state(vd
);
1233 vdev_create(vdev_t
*vd
, uint64_t txg
, boolean_t isreplacing
)
1238 * Normally, partial opens (e.g. of a mirror) are allowed.
1239 * For a create, however, we want to fail the request if
1240 * there are any components we can't open.
1242 error
= vdev_open(vd
);
1244 if (error
|| vd
->vdev_state
!= VDEV_STATE_HEALTHY
) {
1246 return (error
? error
: ENXIO
);
1250 * Recursively initialize all labels.
1252 if ((error
= vdev_label_init(vd
, txg
, isreplacing
?
1253 VDEV_LABEL_REPLACE
: VDEV_LABEL_CREATE
)) != 0) {
1262 * The is the latter half of vdev_create(). It is distinct because it
1263 * involves initiating transactions in order to do metaslab creation.
1264 * For creation, we want to try to create all vdevs at once and then undo it
1265 * if anything fails; this is much harder if we have pending transactions.
1268 vdev_init(vdev_t
*vd
, uint64_t txg
)
1271 * Aim for roughly 200 metaslabs per vdev.
1273 vd
->vdev_ms_shift
= highbit(vd
->vdev_asize
/ 200);
1274 vd
->vdev_ms_shift
= MAX(vd
->vdev_ms_shift
, SPA_MAXBLOCKSHIFT
);
1277 * Initialize the vdev's metaslabs. This can't fail because
1278 * there's nothing to read when creating all new metaslabs.
1280 VERIFY(vdev_metaslab_init(vd
, txg
) == 0);
1284 vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
)
1286 ASSERT(vd
== vd
->vdev_top
);
1287 ASSERT(ISP2(flags
));
1289 if (flags
& VDD_METASLAB
)
1290 (void) txg_list_add(&vd
->vdev_ms_list
, arg
, txg
);
1292 if (flags
& VDD_DTL
)
1293 (void) txg_list_add(&vd
->vdev_dtl_list
, arg
, txg
);
1295 (void) txg_list_add(&vd
->vdev_spa
->spa_vdev_txg_list
, vd
, txg
);
1301 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1302 * the vdev has less than perfect replication. There are three kinds of DTL:
1304 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1306 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1308 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1309 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1310 * txgs that was scrubbed.
1312 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
1313 * persistent errors or just some device being offline.
1314 * Unlike the other three, the DTL_OUTAGE map is not generally
1315 * maintained; it's only computed when needed, typically to
1316 * determine whether a device can be detached.
1318 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
1319 * either has the data or it doesn't.
1321 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
1322 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
1323 * if any child is less than fully replicated, then so is its parent.
1324 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
1325 * comprising only those txgs which appear in 'maxfaults' or more children;
1326 * those are the txgs we don't have enough replication to read. For example,
1327 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
1328 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
1329 * two child DTL_MISSING maps.
1331 * It should be clear from the above that to compute the DTLs and outage maps
1332 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
1333 * Therefore, that is all we keep on disk. When loading the pool, or after
1334 * a configuration change, we generate all other DTLs from first principles.
1337 vdev_dtl_dirty(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1339 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1341 ASSERT(t
< DTL_TYPES
);
1342 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1344 mutex_enter(sm
->sm_lock
);
1345 if (!space_map_contains(sm
, txg
, size
))
1346 space_map_add(sm
, txg
, size
);
1347 mutex_exit(sm
->sm_lock
);
1351 vdev_dtl_contains(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
1353 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1354 boolean_t dirty
= B_FALSE
;
1356 ASSERT(t
< DTL_TYPES
);
1357 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
1359 mutex_enter(sm
->sm_lock
);
1360 if (sm
->sm_space
!= 0)
1361 dirty
= space_map_contains(sm
, txg
, size
);
1362 mutex_exit(sm
->sm_lock
);
1368 vdev_dtl_empty(vdev_t
*vd
, vdev_dtl_type_t t
)
1370 space_map_t
*sm
= &vd
->vdev_dtl
[t
];
1373 mutex_enter(sm
->sm_lock
);
1374 empty
= (sm
->sm_space
== 0);
1375 mutex_exit(sm
->sm_lock
);
1381 * Reassess DTLs after a config change or scrub completion.
1384 vdev_dtl_reassess(vdev_t
*vd
, uint64_t txg
, uint64_t scrub_txg
, int scrub_done
)
1386 spa_t
*spa
= vd
->vdev_spa
;
1390 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
1392 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1393 vdev_dtl_reassess(vd
->vdev_child
[c
], txg
,
1394 scrub_txg
, scrub_done
);
1396 if (vd
== spa
->spa_root_vdev
)
1399 if (vd
->vdev_ops
->vdev_op_leaf
) {
1400 mutex_enter(&vd
->vdev_dtl_lock
);
1401 if (scrub_txg
!= 0 &&
1402 (spa
->spa_scrub_started
|| spa
->spa_scrub_errors
== 0)) {
1403 /* XXX should check scrub_done? */
1405 * We completed a scrub up to scrub_txg. If we
1406 * did it without rebooting, then the scrub dtl
1407 * will be valid, so excise the old region and
1408 * fold in the scrub dtl. Otherwise, leave the
1409 * dtl as-is if there was an error.
1411 * There's little trick here: to excise the beginning
1412 * of the DTL_MISSING map, we put it into a reference
1413 * tree and then add a segment with refcnt -1 that
1414 * covers the range [0, scrub_txg). This means
1415 * that each txg in that range has refcnt -1 or 0.
1416 * We then add DTL_SCRUB with a refcnt of 2, so that
1417 * entries in the range [0, scrub_txg) will have a
1418 * positive refcnt -- either 1 or 2. We then convert
1419 * the reference tree into the new DTL_MISSING map.
1421 space_map_ref_create(&reftree
);
1422 space_map_ref_add_map(&reftree
,
1423 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1424 space_map_ref_add_seg(&reftree
, 0, scrub_txg
, -1);
1425 space_map_ref_add_map(&reftree
,
1426 &vd
->vdev_dtl
[DTL_SCRUB
], 2);
1427 space_map_ref_generate_map(&reftree
,
1428 &vd
->vdev_dtl
[DTL_MISSING
], 1);
1429 space_map_ref_destroy(&reftree
);
1431 space_map_vacate(&vd
->vdev_dtl
[DTL_PARTIAL
], NULL
, NULL
);
1432 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1433 space_map_add
, &vd
->vdev_dtl
[DTL_PARTIAL
]);
1435 space_map_vacate(&vd
->vdev_dtl
[DTL_SCRUB
], NULL
, NULL
);
1436 space_map_vacate(&vd
->vdev_dtl
[DTL_OUTAGE
], NULL
, NULL
);
1437 if (!vdev_readable(vd
))
1438 space_map_add(&vd
->vdev_dtl
[DTL_OUTAGE
], 0, -1ULL);
1440 space_map_walk(&vd
->vdev_dtl
[DTL_MISSING
],
1441 space_map_add
, &vd
->vdev_dtl
[DTL_OUTAGE
]);
1442 mutex_exit(&vd
->vdev_dtl_lock
);
1445 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, txg
);
1449 mutex_enter(&vd
->vdev_dtl_lock
);
1450 for (int t
= 0; t
< DTL_TYPES
; t
++) {
1452 continue; /* leaf vdevs only */
1453 if (t
== DTL_PARTIAL
)
1454 minref
= 1; /* i.e. non-zero */
1455 else if (vd
->vdev_nparity
!= 0)
1456 minref
= vd
->vdev_nparity
+ 1; /* RAID-Z */
1458 minref
= vd
->vdev_children
; /* any kind of mirror */
1459 space_map_ref_create(&reftree
);
1460 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1461 vdev_t
*cvd
= vd
->vdev_child
[c
];
1462 mutex_enter(&cvd
->vdev_dtl_lock
);
1463 space_map_ref_add_map(&reftree
, &cvd
->vdev_dtl
[t
], 1);
1464 mutex_exit(&cvd
->vdev_dtl_lock
);
1466 space_map_ref_generate_map(&reftree
, &vd
->vdev_dtl
[t
], minref
);
1467 space_map_ref_destroy(&reftree
);
1469 mutex_exit(&vd
->vdev_dtl_lock
);
1473 vdev_dtl_load(vdev_t
*vd
)
1475 spa_t
*spa
= vd
->vdev_spa
;
1476 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1477 objset_t
*mos
= spa
->spa_meta_objset
;
1481 ASSERT(vd
->vdev_children
== 0);
1483 if (smo
->smo_object
== 0)
1486 if ((error
= dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
)) != 0)
1489 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1490 bcopy(db
->db_data
, smo
, sizeof (*smo
));
1491 dmu_buf_rele(db
, FTAG
);
1493 mutex_enter(&vd
->vdev_dtl_lock
);
1494 error
= space_map_load(&vd
->vdev_dtl
[DTL_MISSING
],
1495 NULL
, SM_ALLOC
, smo
, mos
);
1496 mutex_exit(&vd
->vdev_dtl_lock
);
1502 vdev_dtl_sync(vdev_t
*vd
, uint64_t txg
)
1504 spa_t
*spa
= vd
->vdev_spa
;
1505 space_map_obj_t
*smo
= &vd
->vdev_dtl_smo
;
1506 space_map_t
*sm
= &vd
->vdev_dtl
[DTL_MISSING
];
1507 objset_t
*mos
= spa
->spa_meta_objset
;
1513 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1515 if (vd
->vdev_detached
) {
1516 if (smo
->smo_object
!= 0) {
1517 int err
= dmu_object_free(mos
, smo
->smo_object
, tx
);
1518 ASSERT3U(err
, ==, 0);
1519 smo
->smo_object
= 0;
1525 if (smo
->smo_object
== 0) {
1526 ASSERT(smo
->smo_objsize
== 0);
1527 ASSERT(smo
->smo_alloc
== 0);
1528 smo
->smo_object
= dmu_object_alloc(mos
,
1529 DMU_OT_SPACE_MAP
, 1 << SPACE_MAP_BLOCKSHIFT
,
1530 DMU_OT_SPACE_MAP_HEADER
, sizeof (*smo
), tx
);
1531 ASSERT(smo
->smo_object
!= 0);
1532 vdev_config_dirty(vd
->vdev_top
);
1535 mutex_init(&smlock
, NULL
, MUTEX_DEFAULT
, NULL
);
1537 space_map_create(&smsync
, sm
->sm_start
, sm
->sm_size
, sm
->sm_shift
,
1540 mutex_enter(&smlock
);
1542 mutex_enter(&vd
->vdev_dtl_lock
);
1543 space_map_walk(sm
, space_map_add
, &smsync
);
1544 mutex_exit(&vd
->vdev_dtl_lock
);
1546 space_map_truncate(smo
, mos
, tx
);
1547 space_map_sync(&smsync
, SM_ALLOC
, smo
, mos
, tx
);
1549 space_map_destroy(&smsync
);
1551 mutex_exit(&smlock
);
1552 mutex_destroy(&smlock
);
1554 VERIFY(0 == dmu_bonus_hold(mos
, smo
->smo_object
, FTAG
, &db
));
1555 dmu_buf_will_dirty(db
, tx
);
1556 ASSERT3U(db
->db_size
, >=, sizeof (*smo
));
1557 bcopy(smo
, db
->db_data
, sizeof (*smo
));
1558 dmu_buf_rele(db
, FTAG
);
1564 * Determine whether the specified vdev can be offlined/detached/removed
1565 * without losing data.
1568 vdev_dtl_required(vdev_t
*vd
)
1570 spa_t
*spa
= vd
->vdev_spa
;
1571 vdev_t
*tvd
= vd
->vdev_top
;
1572 uint8_t cant_read
= vd
->vdev_cant_read
;
1575 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1577 if (vd
== spa
->spa_root_vdev
|| vd
== tvd
)
1581 * Temporarily mark the device as unreadable, and then determine
1582 * whether this results in any DTL outages in the top-level vdev.
1583 * If not, we can safely offline/detach/remove the device.
1585 vd
->vdev_cant_read
= B_TRUE
;
1586 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1587 required
= !vdev_dtl_empty(tvd
, DTL_OUTAGE
);
1588 vd
->vdev_cant_read
= cant_read
;
1589 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
1595 * Determine if resilver is needed, and if so the txg range.
1598 vdev_resilver_needed(vdev_t
*vd
, uint64_t *minp
, uint64_t *maxp
)
1600 boolean_t needed
= B_FALSE
;
1601 uint64_t thismin
= UINT64_MAX
;
1602 uint64_t thismax
= 0;
1604 if (vd
->vdev_children
== 0) {
1605 mutex_enter(&vd
->vdev_dtl_lock
);
1606 if (vd
->vdev_dtl
[DTL_MISSING
].sm_space
!= 0 &&
1607 vdev_writeable(vd
)) {
1610 ss
= avl_first(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1611 thismin
= ss
->ss_start
- 1;
1612 ss
= avl_last(&vd
->vdev_dtl
[DTL_MISSING
].sm_root
);
1613 thismax
= ss
->ss_end
;
1616 mutex_exit(&vd
->vdev_dtl_lock
);
1618 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1619 vdev_t
*cvd
= vd
->vdev_child
[c
];
1620 uint64_t cmin
, cmax
;
1622 if (vdev_resilver_needed(cvd
, &cmin
, &cmax
)) {
1623 thismin
= MIN(thismin
, cmin
);
1624 thismax
= MAX(thismax
, cmax
);
1630 if (needed
&& minp
) {
1638 vdev_load(vdev_t
*vd
)
1641 * Recursively load all children.
1643 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1644 vdev_load(vd
->vdev_child
[c
]);
1647 * If this is a top-level vdev, initialize its metaslabs.
1649 if (vd
== vd
->vdev_top
&&
1650 (vd
->vdev_ashift
== 0 || vd
->vdev_asize
== 0 ||
1651 vdev_metaslab_init(vd
, 0) != 0))
1652 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1653 VDEV_AUX_CORRUPT_DATA
);
1656 * If this is a leaf vdev, load its DTL.
1658 if (vd
->vdev_ops
->vdev_op_leaf
&& vdev_dtl_load(vd
) != 0)
1659 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1660 VDEV_AUX_CORRUPT_DATA
);
1664 * The special vdev case is used for hot spares and l2cache devices. Its
1665 * sole purpose it to set the vdev state for the associated vdev. To do this,
1666 * we make sure that we can open the underlying device, then try to read the
1667 * label, and make sure that the label is sane and that it hasn't been
1668 * repurposed to another pool.
1671 vdev_validate_aux(vdev_t
*vd
)
1674 uint64_t guid
, version
;
1677 if (!vdev_readable(vd
))
1680 if ((label
= vdev_label_read_config(vd
)) == NULL
) {
1681 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1682 VDEV_AUX_CORRUPT_DATA
);
1686 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_VERSION
, &version
) != 0 ||
1687 version
> SPA_VERSION
||
1688 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0 ||
1689 guid
!= vd
->vdev_guid
||
1690 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
, &state
) != 0) {
1691 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1692 VDEV_AUX_CORRUPT_DATA
);
1698 * We don't actually check the pool state here. If it's in fact in
1699 * use by another pool, we update this fact on the fly when requested.
1706 vdev_sync_done(vdev_t
*vd
, uint64_t txg
)
1710 while (msp
= txg_list_remove(&vd
->vdev_ms_list
, TXG_CLEAN(txg
)))
1711 metaslab_sync_done(msp
, txg
);
1715 vdev_sync(vdev_t
*vd
, uint64_t txg
)
1717 spa_t
*spa
= vd
->vdev_spa
;
1722 if (vd
->vdev_ms_array
== 0 && vd
->vdev_ms_shift
!= 0) {
1723 ASSERT(vd
== vd
->vdev_top
);
1724 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
1725 vd
->vdev_ms_array
= dmu_object_alloc(spa
->spa_meta_objset
,
1726 DMU_OT_OBJECT_ARRAY
, 0, DMU_OT_NONE
, 0, tx
);
1727 ASSERT(vd
->vdev_ms_array
!= 0);
1728 vdev_config_dirty(vd
);
1732 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, txg
)) != NULL
) {
1733 metaslab_sync(msp
, txg
);
1734 (void) txg_list_add(&vd
->vdev_ms_list
, msp
, TXG_CLEAN(txg
));
1737 while ((lvd
= txg_list_remove(&vd
->vdev_dtl_list
, txg
)) != NULL
)
1738 vdev_dtl_sync(lvd
, txg
);
1740 (void) txg_list_add(&spa
->spa_vdev_txg_list
, vd
, TXG_CLEAN(txg
));
1744 vdev_psize_to_asize(vdev_t
*vd
, uint64_t psize
)
1746 return (vd
->vdev_ops
->vdev_op_asize(vd
, psize
));
1750 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
1751 * not be opened, and no I/O is attempted.
1754 vdev_fault(spa_t
*spa
, uint64_t guid
)
1758 spa_vdev_state_enter(spa
);
1760 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
1761 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
1763 if (!vd
->vdev_ops
->vdev_op_leaf
)
1764 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
1767 * Faulted state takes precedence over degraded.
1769 vd
->vdev_faulted
= 1ULL;
1770 vd
->vdev_degraded
= 0ULL;
1771 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_FAULTED
, VDEV_AUX_ERR_EXCEEDED
);
1774 * If marking the vdev as faulted cause the top-level vdev to become
1775 * unavailable, then back off and simply mark the vdev as degraded
1778 if (vdev_is_dead(vd
->vdev_top
) && vd
->vdev_aux
== NULL
) {
1779 vd
->vdev_degraded
= 1ULL;
1780 vd
->vdev_faulted
= 0ULL;
1783 * If we reopen the device and it's not dead, only then do we
1788 if (vdev_readable(vd
)) {
1789 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
1790 VDEV_AUX_ERR_EXCEEDED
);
1794 return (spa_vdev_state_exit(spa
, vd
, 0));
1798 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
1799 * user that something is wrong. The vdev continues to operate as normal as far
1800 * as I/O is concerned.
1803 vdev_degrade(spa_t
*spa
, uint64_t guid
)
1807 spa_vdev_state_enter(spa
);
1809 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
1810 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
1812 if (!vd
->vdev_ops
->vdev_op_leaf
)
1813 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
1816 * If the vdev is already faulted, then don't do anything.
1818 if (vd
->vdev_faulted
|| vd
->vdev_degraded
)
1819 return (spa_vdev_state_exit(spa
, NULL
, 0));
1821 vd
->vdev_degraded
= 1ULL;
1822 if (!vdev_is_dead(vd
))
1823 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
1824 VDEV_AUX_ERR_EXCEEDED
);
1826 return (spa_vdev_state_exit(spa
, vd
, 0));
1830 * Online the given vdev. If 'unspare' is set, it implies two things. First,
1831 * any attached spare device should be detached when the device finishes
1832 * resilvering. Second, the online should be treated like a 'test' online case,
1833 * so no FMA events are generated if the device fails to open.
1836 vdev_online(spa_t
*spa
, uint64_t guid
, uint64_t flags
, vdev_state_t
*newstate
)
1840 spa_vdev_state_enter(spa
);
1842 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
1843 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
1845 if (!vd
->vdev_ops
->vdev_op_leaf
)
1846 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
1848 vd
->vdev_offline
= B_FALSE
;
1849 vd
->vdev_tmpoffline
= B_FALSE
;
1850 vd
->vdev_checkremove
= !!(flags
& ZFS_ONLINE_CHECKREMOVE
);
1851 vd
->vdev_forcefault
= !!(flags
& ZFS_ONLINE_FORCEFAULT
);
1852 vdev_reopen(vd
->vdev_top
);
1853 vd
->vdev_checkremove
= vd
->vdev_forcefault
= B_FALSE
;
1856 *newstate
= vd
->vdev_state
;
1857 if ((flags
& ZFS_ONLINE_UNSPARE
) &&
1858 !vdev_is_dead(vd
) && vd
->vdev_parent
&&
1859 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
1860 vd
->vdev_parent
->vdev_child
[0] == vd
)
1861 vd
->vdev_unspare
= B_TRUE
;
1863 return (spa_vdev_state_exit(spa
, vd
, 0));
1867 vdev_offline(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
1871 spa_vdev_state_enter(spa
);
1873 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
1874 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
1876 if (!vd
->vdev_ops
->vdev_op_leaf
)
1877 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
1880 * If the device isn't already offline, try to offline it.
1882 if (!vd
->vdev_offline
) {
1884 * If this device has the only valid copy of some data,
1885 * don't allow it to be offlined.
1887 if (vd
->vdev_aux
== NULL
&& vdev_dtl_required(vd
))
1888 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
1891 * Offline this device and reopen its top-level vdev.
1892 * If this action results in the top-level vdev becoming
1893 * unusable, undo it and fail the request.
1895 vd
->vdev_offline
= B_TRUE
;
1896 vdev_reopen(vd
->vdev_top
);
1897 if (vd
->vdev_aux
== NULL
&& vdev_is_dead(vd
->vdev_top
)) {
1898 vd
->vdev_offline
= B_FALSE
;
1899 vdev_reopen(vd
->vdev_top
);
1900 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
1904 vd
->vdev_tmpoffline
= !!(flags
& ZFS_OFFLINE_TEMPORARY
);
1906 return (spa_vdev_state_exit(spa
, vd
, 0));
1910 * Clear the error counts associated with this vdev. Unlike vdev_online() and
1911 * vdev_offline(), we assume the spa config is locked. We also clear all
1912 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
1915 vdev_clear(spa_t
*spa
, vdev_t
*vd
)
1917 vdev_t
*rvd
= spa
->spa_root_vdev
;
1919 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1924 vd
->vdev_stat
.vs_read_errors
= 0;
1925 vd
->vdev_stat
.vs_write_errors
= 0;
1926 vd
->vdev_stat
.vs_checksum_errors
= 0;
1928 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1929 vdev_clear(spa
, vd
->vdev_child
[c
]);
1932 * If we're in the FAULTED state or have experienced failed I/O, then
1933 * clear the persistent state and attempt to reopen the device. We
1934 * also mark the vdev config dirty, so that the new faulted state is
1935 * written out to disk.
1937 if (vd
->vdev_faulted
|| vd
->vdev_degraded
||
1938 !vdev_readable(vd
) || !vdev_writeable(vd
)) {
1940 vd
->vdev_faulted
= vd
->vdev_degraded
= 0;
1941 vd
->vdev_cant_read
= B_FALSE
;
1942 vd
->vdev_cant_write
= B_FALSE
;
1947 vdev_state_dirty(vd
->vdev_top
);
1949 if (vd
->vdev_aux
== NULL
&& !vdev_is_dead(vd
))
1950 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1952 spa_event_notify(spa
, vd
, ESC_ZFS_VDEV_CLEAR
);
1957 vdev_is_dead(vdev_t
*vd
)
1959 return (vd
->vdev_state
< VDEV_STATE_DEGRADED
);
1963 vdev_readable(vdev_t
*vd
)
1965 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_read
);
1969 vdev_writeable(vdev_t
*vd
)
1971 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_write
);
1975 vdev_allocatable(vdev_t
*vd
)
1977 uint64_t state
= vd
->vdev_state
;
1980 * We currently allow allocations from vdevs which may be in the
1981 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
1982 * fails to reopen then we'll catch it later when we're holding
1983 * the proper locks. Note that we have to get the vdev state
1984 * in a local variable because although it changes atomically,
1985 * we're asking two separate questions about it.
1987 return (!(state
< VDEV_STATE_DEGRADED
&& state
!= VDEV_STATE_CLOSED
) &&
1988 !vd
->vdev_cant_write
);
1992 vdev_accessible(vdev_t
*vd
, zio_t
*zio
)
1994 ASSERT(zio
->io_vd
== vd
);
1996 if (vdev_is_dead(vd
) || vd
->vdev_remove_wanted
)
1999 if (zio
->io_type
== ZIO_TYPE_READ
)
2000 return (!vd
->vdev_cant_read
);
2002 if (zio
->io_type
== ZIO_TYPE_WRITE
)
2003 return (!vd
->vdev_cant_write
);
2009 * Get statistics for the given vdev.
2012 vdev_get_stats(vdev_t
*vd
, vdev_stat_t
*vs
)
2014 vdev_t
*rvd
= vd
->vdev_spa
->spa_root_vdev
;
2016 mutex_enter(&vd
->vdev_stat_lock
);
2017 bcopy(&vd
->vdev_stat
, vs
, sizeof (*vs
));
2018 vs
->vs_scrub_errors
= vd
->vdev_spa
->spa_scrub_errors
;
2019 vs
->vs_timestamp
= gethrtime() - vs
->vs_timestamp
;
2020 vs
->vs_state
= vd
->vdev_state
;
2021 vs
->vs_rsize
= vdev_get_rsize(vd
);
2022 mutex_exit(&vd
->vdev_stat_lock
);
2025 * If we're getting stats on the root vdev, aggregate the I/O counts
2026 * over all top-level vdevs (i.e. the direct children of the root).
2029 for (int c
= 0; c
< rvd
->vdev_children
; c
++) {
2030 vdev_t
*cvd
= rvd
->vdev_child
[c
];
2031 vdev_stat_t
*cvs
= &cvd
->vdev_stat
;
2033 mutex_enter(&vd
->vdev_stat_lock
);
2034 for (int t
= 0; t
< ZIO_TYPES
; t
++) {
2035 vs
->vs_ops
[t
] += cvs
->vs_ops
[t
];
2036 vs
->vs_bytes
[t
] += cvs
->vs_bytes
[t
];
2038 vs
->vs_scrub_examined
+= cvs
->vs_scrub_examined
;
2039 mutex_exit(&vd
->vdev_stat_lock
);
2045 vdev_clear_stats(vdev_t
*vd
)
2047 mutex_enter(&vd
->vdev_stat_lock
);
2048 vd
->vdev_stat
.vs_space
= 0;
2049 vd
->vdev_stat
.vs_dspace
= 0;
2050 vd
->vdev_stat
.vs_alloc
= 0;
2051 mutex_exit(&vd
->vdev_stat_lock
);
2055 vdev_stat_update(zio_t
*zio
, uint64_t psize
)
2057 spa_t
*spa
= zio
->io_spa
;
2058 vdev_t
*rvd
= spa
->spa_root_vdev
;
2059 vdev_t
*vd
= zio
->io_vd
? zio
->io_vd
: rvd
;
2061 uint64_t txg
= zio
->io_txg
;
2062 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2063 zio_type_t type
= zio
->io_type
;
2064 int flags
= zio
->io_flags
;
2067 * If this i/o is a gang leader, it didn't do any actual work.
2069 if (zio
->io_gang_tree
)
2072 if (zio
->io_error
== 0) {
2074 * If this is a root i/o, don't count it -- we've already
2075 * counted the top-level vdevs, and vdev_get_stats() will
2076 * aggregate them when asked. This reduces contention on
2077 * the root vdev_stat_lock and implicitly handles blocks
2078 * that compress away to holes, for which there is no i/o.
2079 * (Holes never create vdev children, so all the counters
2080 * remain zero, which is what we want.)
2082 * Note: this only applies to successful i/o (io_error == 0)
2083 * because unlike i/o counts, errors are not additive.
2084 * When reading a ditto block, for example, failure of
2085 * one top-level vdev does not imply a root-level error.
2090 ASSERT(vd
== zio
->io_vd
);
2092 if (flags
& ZIO_FLAG_IO_BYPASS
)
2095 mutex_enter(&vd
->vdev_stat_lock
);
2097 if (flags
& ZIO_FLAG_IO_REPAIR
) {
2098 if (flags
& ZIO_FLAG_SCRUB_THREAD
)
2099 vs
->vs_scrub_repaired
+= psize
;
2100 if (flags
& ZIO_FLAG_SELF_HEAL
)
2101 vs
->vs_self_healed
+= psize
;
2105 vs
->vs_bytes
[type
] += psize
;
2107 mutex_exit(&vd
->vdev_stat_lock
);
2111 if (flags
& ZIO_FLAG_SPECULATIVE
)
2114 mutex_enter(&vd
->vdev_stat_lock
);
2115 if (type
== ZIO_TYPE_READ
) {
2116 if (zio
->io_error
== ECKSUM
)
2117 vs
->vs_checksum_errors
++;
2119 vs
->vs_read_errors
++;
2121 if (type
== ZIO_TYPE_WRITE
)
2122 vs
->vs_write_errors
++;
2123 mutex_exit(&vd
->vdev_stat_lock
);
2125 if (type
== ZIO_TYPE_WRITE
&& txg
!= 0 &&
2126 (!(flags
& ZIO_FLAG_IO_REPAIR
) ||
2127 (flags
& ZIO_FLAG_SCRUB_THREAD
))) {
2129 * This is either a normal write (not a repair), or it's a
2130 * repair induced by the scrub thread. In the normal case,
2131 * we commit the DTL change in the same txg as the block
2132 * was born. In the scrub-induced repair case, we know that
2133 * scrubs run in first-pass syncing context, so we commit
2134 * the DTL change in spa->spa_syncing_txg.
2136 * We currently do not make DTL entries for failed spontaneous
2137 * self-healing writes triggered by normal (non-scrubbing)
2138 * reads, because we have no transactional context in which to
2139 * do so -- and it's not clear that it'd be desirable anyway.
2141 if (vd
->vdev_ops
->vdev_op_leaf
) {
2142 uint64_t commit_txg
= txg
;
2143 if (flags
& ZIO_FLAG_SCRUB_THREAD
) {
2144 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
2145 ASSERT(spa_sync_pass(spa
) == 1);
2146 vdev_dtl_dirty(vd
, DTL_SCRUB
, txg
, 1);
2147 commit_txg
= spa
->spa_syncing_txg
;
2149 ASSERT(commit_txg
>= spa
->spa_syncing_txg
);
2150 if (vdev_dtl_contains(vd
, DTL_MISSING
, txg
, 1))
2152 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2153 vdev_dtl_dirty(pvd
, DTL_PARTIAL
, txg
, 1);
2154 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, commit_txg
);
2157 vdev_dtl_dirty(vd
, DTL_MISSING
, txg
, 1);
2162 vdev_scrub_stat_update(vdev_t
*vd
, pool_scrub_type_t type
, boolean_t complete
)
2165 vdev_stat_t
*vs
= &vd
->vdev_stat
;
2167 for (c
= 0; c
< vd
->vdev_children
; c
++)
2168 vdev_scrub_stat_update(vd
->vdev_child
[c
], type
, complete
);
2170 mutex_enter(&vd
->vdev_stat_lock
);
2172 if (type
== POOL_SCRUB_NONE
) {
2174 * Update completion and end time. Leave everything else alone
2175 * so we can report what happened during the previous scrub.
2177 vs
->vs_scrub_complete
= complete
;
2178 vs
->vs_scrub_end
= gethrestime_sec();
2180 vs
->vs_scrub_type
= type
;
2181 vs
->vs_scrub_complete
= 0;
2182 vs
->vs_scrub_examined
= 0;
2183 vs
->vs_scrub_repaired
= 0;
2184 vs
->vs_scrub_start
= gethrestime_sec();
2185 vs
->vs_scrub_end
= 0;
2188 mutex_exit(&vd
->vdev_stat_lock
);
2192 * Update the in-core space usage stats for this vdev and the root vdev.
2195 vdev_space_update(vdev_t
*vd
, int64_t space_delta
, int64_t alloc_delta
,
2196 boolean_t update_root
)
2198 int64_t dspace_delta
= space_delta
;
2199 spa_t
*spa
= vd
->vdev_spa
;
2200 vdev_t
*rvd
= spa
->spa_root_vdev
;
2202 ASSERT(vd
== vd
->vdev_top
);
2205 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
2206 * factor. We must calculate this here and not at the root vdev
2207 * because the root vdev's psize-to-asize is simply the max of its
2208 * childrens', thus not accurate enough for us.
2210 ASSERT((dspace_delta
& (SPA_MINBLOCKSIZE
-1)) == 0);
2211 dspace_delta
= (dspace_delta
>> SPA_MINBLOCKSHIFT
) *
2212 vd
->vdev_deflate_ratio
;
2214 mutex_enter(&vd
->vdev_stat_lock
);
2215 vd
->vdev_stat
.vs_space
+= space_delta
;
2216 vd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2217 vd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2218 mutex_exit(&vd
->vdev_stat_lock
);
2221 ASSERT(rvd
== vd
->vdev_parent
);
2222 ASSERT(vd
->vdev_ms_count
!= 0);
2225 * Don't count non-normal (e.g. intent log) space as part of
2226 * the pool's capacity.
2228 if (vd
->vdev_mg
->mg_class
!= spa
->spa_normal_class
)
2231 mutex_enter(&rvd
->vdev_stat_lock
);
2232 rvd
->vdev_stat
.vs_space
+= space_delta
;
2233 rvd
->vdev_stat
.vs_alloc
+= alloc_delta
;
2234 rvd
->vdev_stat
.vs_dspace
+= dspace_delta
;
2235 mutex_exit(&rvd
->vdev_stat_lock
);
2240 * Mark a top-level vdev's config as dirty, placing it on the dirty list
2241 * so that it will be written out next time the vdev configuration is synced.
2242 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
2245 vdev_config_dirty(vdev_t
*vd
)
2247 spa_t
*spa
= vd
->vdev_spa
;
2248 vdev_t
*rvd
= spa
->spa_root_vdev
;
2252 * If this is an aux vdev (as with l2cache devices), then we update the
2253 * vdev config manually and set the sync flag.
2255 if (vd
->vdev_aux
!= NULL
) {
2256 spa_aux_vdev_t
*sav
= vd
->vdev_aux
;
2260 for (c
= 0; c
< sav
->sav_count
; c
++) {
2261 if (sav
->sav_vdevs
[c
] == vd
)
2265 if (c
== sav
->sav_count
) {
2267 * We're being removed. There's nothing more to do.
2269 ASSERT(sav
->sav_sync
== B_TRUE
);
2273 sav
->sav_sync
= B_TRUE
;
2275 VERIFY(nvlist_lookup_nvlist_array(sav
->sav_config
,
2276 ZPOOL_CONFIG_L2CACHE
, &aux
, &naux
) == 0);
2281 * Setting the nvlist in the middle if the array is a little
2282 * sketchy, but it will work.
2284 nvlist_free(aux
[c
]);
2285 aux
[c
] = vdev_config_generate(spa
, vd
, B_TRUE
, B_FALSE
, B_TRUE
);
2291 * The dirty list is protected by the SCL_CONFIG lock. The caller
2292 * must either hold SCL_CONFIG as writer, or must be the sync thread
2293 * (which holds SCL_CONFIG as reader). There's only one sync thread,
2294 * so this is sufficient to ensure mutual exclusion.
2296 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2297 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2298 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2301 for (c
= 0; c
< rvd
->vdev_children
; c
++)
2302 vdev_config_dirty(rvd
->vdev_child
[c
]);
2304 ASSERT(vd
== vd
->vdev_top
);
2306 if (!list_link_active(&vd
->vdev_config_dirty_node
))
2307 list_insert_head(&spa
->spa_config_dirty_list
, vd
);
2312 vdev_config_clean(vdev_t
*vd
)
2314 spa_t
*spa
= vd
->vdev_spa
;
2316 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
2317 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2318 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
2320 ASSERT(list_link_active(&vd
->vdev_config_dirty_node
));
2321 list_remove(&spa
->spa_config_dirty_list
, vd
);
2325 * Mark a top-level vdev's state as dirty, so that the next pass of
2326 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
2327 * the state changes from larger config changes because they require
2328 * much less locking, and are often needed for administrative actions.
2331 vdev_state_dirty(vdev_t
*vd
)
2333 spa_t
*spa
= vd
->vdev_spa
;
2335 ASSERT(vd
== vd
->vdev_top
);
2338 * The state list is protected by the SCL_STATE lock. The caller
2339 * must either hold SCL_STATE as writer, or must be the sync thread
2340 * (which holds SCL_STATE as reader). There's only one sync thread,
2341 * so this is sufficient to ensure mutual exclusion.
2343 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2344 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2345 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2347 if (!list_link_active(&vd
->vdev_state_dirty_node
))
2348 list_insert_head(&spa
->spa_state_dirty_list
, vd
);
2352 vdev_state_clean(vdev_t
*vd
)
2354 spa_t
*spa
= vd
->vdev_spa
;
2356 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
2357 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
2358 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
2360 ASSERT(list_link_active(&vd
->vdev_state_dirty_node
));
2361 list_remove(&spa
->spa_state_dirty_list
, vd
);
2365 * Propagate vdev state up from children to parent.
2368 vdev_propagate_state(vdev_t
*vd
)
2370 spa_t
*spa
= vd
->vdev_spa
;
2371 vdev_t
*rvd
= spa
->spa_root_vdev
;
2372 int degraded
= 0, faulted
= 0;
2377 if (vd
->vdev_children
> 0) {
2378 for (c
= 0; c
< vd
->vdev_children
; c
++) {
2379 child
= vd
->vdev_child
[c
];
2381 if (!vdev_readable(child
) ||
2382 (!vdev_writeable(child
) && spa_writeable(spa
))) {
2384 * Root special: if there is a top-level log
2385 * device, treat the root vdev as if it were
2388 if (child
->vdev_islog
&& vd
== rvd
)
2392 } else if (child
->vdev_state
<= VDEV_STATE_DEGRADED
) {
2396 if (child
->vdev_stat
.vs_aux
== VDEV_AUX_CORRUPT_DATA
)
2400 vd
->vdev_ops
->vdev_op_state_change(vd
, faulted
, degraded
);
2403 * Root special: if there is a top-level vdev that cannot be
2404 * opened due to corrupted metadata, then propagate the root
2405 * vdev's aux state as 'corrupt' rather than 'insufficient
2408 if (corrupted
&& vd
== rvd
&&
2409 rvd
->vdev_state
== VDEV_STATE_CANT_OPEN
)
2410 vdev_set_state(rvd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2411 VDEV_AUX_CORRUPT_DATA
);
2414 if (vd
->vdev_parent
)
2415 vdev_propagate_state(vd
->vdev_parent
);
2419 * Set a vdev's state. If this is during an open, we don't update the parent
2420 * state, because we're in the process of opening children depth-first.
2421 * Otherwise, we propagate the change to the parent.
2423 * If this routine places a device in a faulted state, an appropriate ereport is
2427 vdev_set_state(vdev_t
*vd
, boolean_t isopen
, vdev_state_t state
, vdev_aux_t aux
)
2429 uint64_t save_state
;
2430 spa_t
*spa
= vd
->vdev_spa
;
2432 if (state
== vd
->vdev_state
) {
2433 vd
->vdev_stat
.vs_aux
= aux
;
2437 save_state
= vd
->vdev_state
;
2439 vd
->vdev_state
= state
;
2440 vd
->vdev_stat
.vs_aux
= aux
;
2443 * If we are setting the vdev state to anything but an open state, then
2444 * always close the underlying device. Otherwise, we keep accessible
2445 * but invalid devices open forever. We don't call vdev_close() itself,
2446 * because that implies some extra checks (offline, etc) that we don't
2447 * want here. This is limited to leaf devices, because otherwise
2448 * closing the device will affect other children.
2450 if (vdev_is_dead(vd
) && vd
->vdev_ops
->vdev_op_leaf
)
2451 vd
->vdev_ops
->vdev_op_close(vd
);
2453 if (vd
->vdev_removed
&&
2454 state
== VDEV_STATE_CANT_OPEN
&&
2455 (aux
== VDEV_AUX_OPEN_FAILED
|| vd
->vdev_checkremove
)) {
2457 * If the previous state is set to VDEV_STATE_REMOVED, then this
2458 * device was previously marked removed and someone attempted to
2459 * reopen it. If this failed due to a nonexistent device, then
2460 * keep the device in the REMOVED state. We also let this be if
2461 * it is one of our special test online cases, which is only
2462 * attempting to online the device and shouldn't generate an FMA
2465 vd
->vdev_state
= VDEV_STATE_REMOVED
;
2466 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
2467 } else if (state
== VDEV_STATE_REMOVED
) {
2469 * Indicate to the ZFS DE that this device has been removed, and
2470 * any recent errors should be ignored.
2472 zfs_post_remove(spa
, vd
);
2473 vd
->vdev_removed
= B_TRUE
;
2474 } else if (state
== VDEV_STATE_CANT_OPEN
) {
2476 * If we fail to open a vdev during an import, we mark it as
2477 * "not available", which signifies that it was never there to
2478 * begin with. Failure to open such a device is not considered
2481 if (spa
->spa_load_state
== SPA_LOAD_IMPORT
&&
2482 !spa
->spa_import_faulted
&&
2483 vd
->vdev_ops
->vdev_op_leaf
)
2484 vd
->vdev_not_present
= 1;
2487 * Post the appropriate ereport. If the 'prevstate' field is
2488 * set to something other than VDEV_STATE_UNKNOWN, it indicates
2489 * that this is part of a vdev_reopen(). In this case, we don't
2490 * want to post the ereport if the device was already in the
2491 * CANT_OPEN state beforehand.
2493 * If the 'checkremove' flag is set, then this is an attempt to
2494 * online the device in response to an insertion event. If we
2495 * hit this case, then we have detected an insertion event for a
2496 * faulted or offline device that wasn't in the removed state.
2497 * In this scenario, we don't post an ereport because we are
2498 * about to replace the device, or attempt an online with
2499 * vdev_forcefault, which will generate the fault for us.
2501 if ((vd
->vdev_prevstate
!= state
|| vd
->vdev_forcefault
) &&
2502 !vd
->vdev_not_present
&& !vd
->vdev_checkremove
&&
2503 vd
!= spa
->spa_root_vdev
) {
2507 case VDEV_AUX_OPEN_FAILED
:
2508 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED
;
2510 case VDEV_AUX_CORRUPT_DATA
:
2511 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA
;
2513 case VDEV_AUX_NO_REPLICAS
:
2514 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS
;
2516 case VDEV_AUX_BAD_GUID_SUM
:
2517 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM
;
2519 case VDEV_AUX_TOO_SMALL
:
2520 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL
;
2522 case VDEV_AUX_BAD_LABEL
:
2523 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL
;
2525 case VDEV_AUX_IO_FAILURE
:
2526 class = FM_EREPORT_ZFS_IO_FAILURE
;
2529 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN
;
2532 zfs_ereport_post(class, spa
, vd
, NULL
, save_state
, 0);
2535 /* Erase any notion of persistent removed state */
2536 vd
->vdev_removed
= B_FALSE
;
2538 vd
->vdev_removed
= B_FALSE
;
2542 vdev_propagate_state(vd
);
2546 * Check the vdev configuration to ensure that it's capable of supporting
2547 * a root pool. Currently, we do not support RAID-Z or partial configuration.
2548 * In addition, only a single top-level vdev is allowed and none of the leaves
2549 * can be wholedisks.
2552 vdev_is_bootable(vdev_t
*vd
)
2556 if (!vd
->vdev_ops
->vdev_op_leaf
) {
2557 char *vdev_type
= vd
->vdev_ops
->vdev_op_type
;
2559 if (strcmp(vdev_type
, VDEV_TYPE_ROOT
) == 0 &&
2560 vd
->vdev_children
> 1) {
2562 } else if (strcmp(vdev_type
, VDEV_TYPE_RAIDZ
) == 0 ||
2563 strcmp(vdev_type
, VDEV_TYPE_MISSING
) == 0) {
2566 } else if (vd
->vdev_wholedisk
== 1) {
2570 for (c
= 0; c
< vd
->vdev_children
; c
++) {
2571 if (!vdev_is_bootable(vd
->vdev_child
[c
]))