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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
25 * Copyright 2017 Nexenta Systems, Inc.
26 * Copyright (c) 2014 Integros [integros.com]
27 * Copyright 2016 Toomas Soome <tsoome@me.com>
28 * Copyright 2017 Joyent, Inc.
31 #include <sys/zfs_context.h>
32 #include <sys/fm/fs/zfs.h>
34 #include <sys/spa_impl.h>
35 #include <sys/bpobj.h>
37 #include <sys/dmu_tx.h>
38 #include <sys/dsl_dir.h>
39 #include <sys/vdev_impl.h>
40 #include <sys/uberblock_impl.h>
41 #include <sys/metaslab.h>
42 #include <sys/metaslab_impl.h>
43 #include <sys/space_map.h>
44 #include <sys/space_reftree.h>
47 #include <sys/fs/zfs.h>
50 #include <sys/dsl_scan.h>
54 * Virtual device management.
57 static vdev_ops_t
*vdev_ops_table
[] = {
71 /* maximum scrub/resilver I/O queue per leaf vdev */
72 int zfs_scrub_limit
= 10;
75 * When a vdev is added, it will be divided into approximately (but no
76 * more than) this number of metaslabs.
78 int metaslabs_per_vdev
= 200;
80 boolean_t vdev_validate_skip
= B_FALSE
;
84 vdev_dbgmsg(vdev_t
*vd
, const char *fmt
, ...)
90 (void) vsnprintf(buf
, sizeof (buf
), fmt
, adx
);
93 if (vd
->vdev_path
!= NULL
) {
94 zfs_dbgmsg("%s vdev '%s': %s", vd
->vdev_ops
->vdev_op_type
,
97 zfs_dbgmsg("%s-%llu vdev (guid %llu): %s",
98 vd
->vdev_ops
->vdev_op_type
,
99 (u_longlong_t
)vd
->vdev_id
,
100 (u_longlong_t
)vd
->vdev_guid
, buf
);
105 vdev_dbgmsg_print_tree(vdev_t
*vd
, int indent
)
109 if (vd
->vdev_ishole
|| vd
->vdev_ops
== &vdev_missing_ops
) {
110 zfs_dbgmsg("%*svdev %u: %s", indent
, "", vd
->vdev_id
,
111 vd
->vdev_ops
->vdev_op_type
);
115 switch (vd
->vdev_state
) {
116 case VDEV_STATE_UNKNOWN
:
117 (void) snprintf(state
, sizeof (state
), "unknown");
119 case VDEV_STATE_CLOSED
:
120 (void) snprintf(state
, sizeof (state
), "closed");
122 case VDEV_STATE_OFFLINE
:
123 (void) snprintf(state
, sizeof (state
), "offline");
125 case VDEV_STATE_REMOVED
:
126 (void) snprintf(state
, sizeof (state
), "removed");
128 case VDEV_STATE_CANT_OPEN
:
129 (void) snprintf(state
, sizeof (state
), "can't open");
131 case VDEV_STATE_FAULTED
:
132 (void) snprintf(state
, sizeof (state
), "faulted");
134 case VDEV_STATE_DEGRADED
:
135 (void) snprintf(state
, sizeof (state
), "degraded");
137 case VDEV_STATE_HEALTHY
:
138 (void) snprintf(state
, sizeof (state
), "healthy");
141 (void) snprintf(state
, sizeof (state
), "<state %u>",
142 (uint_t
)vd
->vdev_state
);
145 zfs_dbgmsg("%*svdev %u: %s%s, guid: %llu, path: %s, %s", indent
,
146 "", vd
->vdev_id
, vd
->vdev_ops
->vdev_op_type
,
147 vd
->vdev_islog
? " (log)" : "",
148 (u_longlong_t
)vd
->vdev_guid
,
149 vd
->vdev_path
? vd
->vdev_path
: "N/A", state
);
151 for (uint64_t i
= 0; i
< vd
->vdev_children
; i
++)
152 vdev_dbgmsg_print_tree(vd
->vdev_child
[i
], indent
+ 2);
156 * Given a vdev type, return the appropriate ops vector.
159 vdev_getops(const char *type
)
161 vdev_ops_t
*ops
, **opspp
;
163 for (opspp
= vdev_ops_table
; (ops
= *opspp
) != NULL
; opspp
++)
164 if (strcmp(ops
->vdev_op_type
, type
) == 0)
171 * Default asize function: return the MAX of psize with the asize of
172 * all children. This is what's used by anything other than RAID-Z.
175 vdev_default_asize(vdev_t
*vd
, uint64_t psize
)
177 uint64_t asize
= P2ROUNDUP(psize
, 1ULL << vd
->vdev_top
->vdev_ashift
);
180 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
181 csize
= vdev_psize_to_asize(vd
->vdev_child
[c
], psize
);
182 asize
= MAX(asize
, csize
);
189 * Get the minimum allocatable size. We define the allocatable size as
190 * the vdev's asize rounded to the nearest metaslab. This allows us to
191 * replace or attach devices which don't have the same physical size but
192 * can still satisfy the same number of allocations.
195 vdev_get_min_asize(vdev_t
*vd
)
197 vdev_t
*pvd
= vd
->vdev_parent
;
200 * If our parent is NULL (inactive spare or cache) or is the root,
201 * just return our own asize.
204 return (vd
->vdev_asize
);
207 * The top-level vdev just returns the allocatable size rounded
208 * to the nearest metaslab.
210 if (vd
== vd
->vdev_top
)
211 return (P2ALIGN(vd
->vdev_asize
, 1ULL << vd
->vdev_ms_shift
));
214 * The allocatable space for a raidz vdev is N * sizeof(smallest child),
215 * so each child must provide at least 1/Nth of its asize.
217 if (pvd
->vdev_ops
== &vdev_raidz_ops
)
218 return ((pvd
->vdev_min_asize
+ pvd
->vdev_children
- 1) /
221 return (pvd
->vdev_min_asize
);
225 vdev_set_min_asize(vdev_t
*vd
)
227 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
229 for (int c
= 0; c
< vd
->vdev_children
; c
++)
230 vdev_set_min_asize(vd
->vdev_child
[c
]);
234 vdev_lookup_top(spa_t
*spa
, uint64_t vdev
)
236 vdev_t
*rvd
= spa
->spa_root_vdev
;
238 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
240 if (vdev
< rvd
->vdev_children
) {
241 ASSERT(rvd
->vdev_child
[vdev
] != NULL
);
242 return (rvd
->vdev_child
[vdev
]);
249 vdev_lookup_by_guid(vdev_t
*vd
, uint64_t guid
)
253 if (vd
->vdev_guid
== guid
)
256 for (int c
= 0; c
< vd
->vdev_children
; c
++)
257 if ((mvd
= vdev_lookup_by_guid(vd
->vdev_child
[c
], guid
)) !=
265 vdev_count_leaves_impl(vdev_t
*vd
)
269 if (vd
->vdev_ops
->vdev_op_leaf
)
272 for (int c
= 0; c
< vd
->vdev_children
; c
++)
273 n
+= vdev_count_leaves_impl(vd
->vdev_child
[c
]);
279 vdev_count_leaves(spa_t
*spa
)
281 return (vdev_count_leaves_impl(spa
->spa_root_vdev
));
285 vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
)
287 size_t oldsize
, newsize
;
288 uint64_t id
= cvd
->vdev_id
;
290 spa_t
*spa
= cvd
->vdev_spa
;
292 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
293 ASSERT(cvd
->vdev_parent
== NULL
);
295 cvd
->vdev_parent
= pvd
;
300 ASSERT(id
>= pvd
->vdev_children
|| pvd
->vdev_child
[id
] == NULL
);
302 oldsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
303 pvd
->vdev_children
= MAX(pvd
->vdev_children
, id
+ 1);
304 newsize
= pvd
->vdev_children
* sizeof (vdev_t
*);
306 newchild
= kmem_zalloc(newsize
, KM_SLEEP
);
307 if (pvd
->vdev_child
!= NULL
) {
308 bcopy(pvd
->vdev_child
, newchild
, oldsize
);
309 kmem_free(pvd
->vdev_child
, oldsize
);
312 pvd
->vdev_child
= newchild
;
313 pvd
->vdev_child
[id
] = cvd
;
315 cvd
->vdev_top
= (pvd
->vdev_top
? pvd
->vdev_top
: cvd
);
316 ASSERT(cvd
->vdev_top
->vdev_parent
->vdev_parent
== NULL
);
319 * Walk up all ancestors to update guid sum.
321 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
322 pvd
->vdev_guid_sum
+= cvd
->vdev_guid_sum
;
326 vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
)
329 uint_t id
= cvd
->vdev_id
;
331 ASSERT(cvd
->vdev_parent
== pvd
);
336 ASSERT(id
< pvd
->vdev_children
);
337 ASSERT(pvd
->vdev_child
[id
] == cvd
);
339 pvd
->vdev_child
[id
] = NULL
;
340 cvd
->vdev_parent
= NULL
;
342 for (c
= 0; c
< pvd
->vdev_children
; c
++)
343 if (pvd
->vdev_child
[c
])
346 if (c
== pvd
->vdev_children
) {
347 kmem_free(pvd
->vdev_child
, c
* sizeof (vdev_t
*));
348 pvd
->vdev_child
= NULL
;
349 pvd
->vdev_children
= 0;
353 * Walk up all ancestors to update guid sum.
355 for (; pvd
!= NULL
; pvd
= pvd
->vdev_parent
)
356 pvd
->vdev_guid_sum
-= cvd
->vdev_guid_sum
;
360 * Remove any holes in the child array.
363 vdev_compact_children(vdev_t
*pvd
)
365 vdev_t
**newchild
, *cvd
;
366 int oldc
= pvd
->vdev_children
;
369 ASSERT(spa_config_held(pvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
371 for (int c
= newc
= 0; c
< oldc
; c
++)
372 if (pvd
->vdev_child
[c
])
375 newchild
= kmem_alloc(newc
* sizeof (vdev_t
*), KM_SLEEP
);
377 for (int c
= newc
= 0; c
< oldc
; c
++) {
378 if ((cvd
= pvd
->vdev_child
[c
]) != NULL
) {
379 newchild
[newc
] = cvd
;
380 cvd
->vdev_id
= newc
++;
384 kmem_free(pvd
->vdev_child
, oldc
* sizeof (vdev_t
*));
385 pvd
->vdev_child
= newchild
;
386 pvd
->vdev_children
= newc
;
390 * Allocate and minimally initialize a vdev_t.
393 vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
, vdev_ops_t
*ops
)
396 vdev_indirect_config_t
*vic
;
398 vd
= kmem_zalloc(sizeof (vdev_t
), KM_SLEEP
);
399 vic
= &vd
->vdev_indirect_config
;
401 if (spa
->spa_root_vdev
== NULL
) {
402 ASSERT(ops
== &vdev_root_ops
);
403 spa
->spa_root_vdev
= vd
;
404 spa
->spa_load_guid
= spa_generate_guid(NULL
);
407 if (guid
== 0 && ops
!= &vdev_hole_ops
) {
408 if (spa
->spa_root_vdev
== vd
) {
410 * The root vdev's guid will also be the pool guid,
411 * which must be unique among all pools.
413 guid
= spa_generate_guid(NULL
);
416 * Any other vdev's guid must be unique within the pool.
418 guid
= spa_generate_guid(spa
);
420 ASSERT(!spa_guid_exists(spa_guid(spa
), guid
));
425 vd
->vdev_guid
= guid
;
426 vd
->vdev_guid_sum
= guid
;
428 vd
->vdev_state
= VDEV_STATE_CLOSED
;
429 vd
->vdev_ishole
= (ops
== &vdev_hole_ops
);
430 vic
->vic_prev_indirect_vdev
= UINT64_MAX
;
432 rw_init(&vd
->vdev_indirect_rwlock
, NULL
, RW_DEFAULT
, NULL
);
433 mutex_init(&vd
->vdev_obsolete_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
434 vd
->vdev_obsolete_segments
= range_tree_create(NULL
, NULL
);
436 mutex_init(&vd
->vdev_dtl_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
437 mutex_init(&vd
->vdev_stat_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
438 mutex_init(&vd
->vdev_probe_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
439 mutex_init(&vd
->vdev_queue_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
440 for (int t
= 0; t
< DTL_TYPES
; t
++) {
441 vd
->vdev_dtl
[t
] = range_tree_create(NULL
, NULL
);
443 txg_list_create(&vd
->vdev_ms_list
, spa
,
444 offsetof(struct metaslab
, ms_txg_node
));
445 txg_list_create(&vd
->vdev_dtl_list
, spa
,
446 offsetof(struct vdev
, vdev_dtl_node
));
447 vd
->vdev_stat
.vs_timestamp
= gethrtime();
455 * Allocate a new vdev. The 'alloctype' is used to control whether we are
456 * creating a new vdev or loading an existing one - the behavior is slightly
457 * different for each case.
460 vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*nv
, vdev_t
*parent
, uint_t id
,
465 uint64_t guid
= 0, islog
, nparity
;
467 vdev_indirect_config_t
*vic
;
469 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
471 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_TYPE
, &type
) != 0)
472 return (SET_ERROR(EINVAL
));
474 if ((ops
= vdev_getops(type
)) == NULL
)
475 return (SET_ERROR(EINVAL
));
478 * If this is a load, get the vdev guid from the nvlist.
479 * Otherwise, vdev_alloc_common() will generate one for us.
481 if (alloctype
== VDEV_ALLOC_LOAD
) {
484 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ID
, &label_id
) ||
486 return (SET_ERROR(EINVAL
));
488 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
489 return (SET_ERROR(EINVAL
));
490 } else if (alloctype
== VDEV_ALLOC_SPARE
) {
491 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
492 return (SET_ERROR(EINVAL
));
493 } else if (alloctype
== VDEV_ALLOC_L2CACHE
) {
494 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
495 return (SET_ERROR(EINVAL
));
496 } else if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
497 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_GUID
, &guid
) != 0)
498 return (SET_ERROR(EINVAL
));
502 * The first allocated vdev must be of type 'root'.
504 if (ops
!= &vdev_root_ops
&& spa
->spa_root_vdev
== NULL
)
505 return (SET_ERROR(EINVAL
));
508 * Determine whether we're a log vdev.
511 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_LOG
, &islog
);
512 if (islog
&& spa_version(spa
) < SPA_VERSION_SLOGS
)
513 return (SET_ERROR(ENOTSUP
));
515 if (ops
== &vdev_hole_ops
&& spa_version(spa
) < SPA_VERSION_HOLES
)
516 return (SET_ERROR(ENOTSUP
));
519 * Set the nparity property for RAID-Z vdevs.
522 if (ops
== &vdev_raidz_ops
) {
523 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NPARITY
,
525 if (nparity
== 0 || nparity
> VDEV_RAIDZ_MAXPARITY
)
526 return (SET_ERROR(EINVAL
));
528 * Previous versions could only support 1 or 2 parity
532 spa_version(spa
) < SPA_VERSION_RAIDZ2
)
533 return (SET_ERROR(ENOTSUP
));
535 spa_version(spa
) < SPA_VERSION_RAIDZ3
)
536 return (SET_ERROR(ENOTSUP
));
539 * We require the parity to be specified for SPAs that
540 * support multiple parity levels.
542 if (spa_version(spa
) >= SPA_VERSION_RAIDZ2
)
543 return (SET_ERROR(EINVAL
));
545 * Otherwise, we default to 1 parity device for RAID-Z.
552 ASSERT(nparity
!= -1ULL);
554 vd
= vdev_alloc_common(spa
, id
, guid
, ops
);
555 vic
= &vd
->vdev_indirect_config
;
557 vd
->vdev_islog
= islog
;
558 vd
->vdev_nparity
= nparity
;
560 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PATH
, &vd
->vdev_path
) == 0)
561 vd
->vdev_path
= spa_strdup(vd
->vdev_path
);
562 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_DEVID
, &vd
->vdev_devid
) == 0)
563 vd
->vdev_devid
= spa_strdup(vd
->vdev_devid
);
564 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_PHYS_PATH
,
565 &vd
->vdev_physpath
) == 0)
566 vd
->vdev_physpath
= spa_strdup(vd
->vdev_physpath
);
567 if (nvlist_lookup_string(nv
, ZPOOL_CONFIG_FRU
, &vd
->vdev_fru
) == 0)
568 vd
->vdev_fru
= spa_strdup(vd
->vdev_fru
);
571 * Set the whole_disk property. If it's not specified, leave the value
574 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_WHOLE_DISK
,
575 &vd
->vdev_wholedisk
) != 0)
576 vd
->vdev_wholedisk
= -1ULL;
578 ASSERT0(vic
->vic_mapping_object
);
579 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_INDIRECT_OBJECT
,
580 &vic
->vic_mapping_object
);
581 ASSERT0(vic
->vic_births_object
);
582 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_INDIRECT_BIRTHS
,
583 &vic
->vic_births_object
);
584 ASSERT3U(vic
->vic_prev_indirect_vdev
, ==, UINT64_MAX
);
585 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_PREV_INDIRECT_VDEV
,
586 &vic
->vic_prev_indirect_vdev
);
589 * Look for the 'not present' flag. This will only be set if the device
590 * was not present at the time of import.
592 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_NOT_PRESENT
,
593 &vd
->vdev_not_present
);
596 * Get the alignment requirement.
598 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASHIFT
, &vd
->vdev_ashift
);
601 * Retrieve the vdev creation time.
603 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_CREATE_TXG
,
607 * If we're a top-level vdev, try to load the allocation parameters.
609 if (parent
&& !parent
->vdev_parent
&&
610 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_SPLIT
)) {
611 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_ARRAY
,
613 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_METASLAB_SHIFT
,
615 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_ASIZE
,
617 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVING
,
619 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_VDEV_TOP_ZAP
,
622 ASSERT0(vd
->vdev_top_zap
);
625 if (parent
&& !parent
->vdev_parent
&& alloctype
!= VDEV_ALLOC_ATTACH
) {
626 ASSERT(alloctype
== VDEV_ALLOC_LOAD
||
627 alloctype
== VDEV_ALLOC_ADD
||
628 alloctype
== VDEV_ALLOC_SPLIT
||
629 alloctype
== VDEV_ALLOC_ROOTPOOL
);
630 vd
->vdev_mg
= metaslab_group_create(islog
?
631 spa_log_class(spa
) : spa_normal_class(spa
), vd
);
634 if (vd
->vdev_ops
->vdev_op_leaf
&&
635 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_SPLIT
)) {
636 (void) nvlist_lookup_uint64(nv
,
637 ZPOOL_CONFIG_VDEV_LEAF_ZAP
, &vd
->vdev_leaf_zap
);
639 ASSERT0(vd
->vdev_leaf_zap
);
643 * If we're a leaf vdev, try to load the DTL object and other state.
646 if (vd
->vdev_ops
->vdev_op_leaf
&&
647 (alloctype
== VDEV_ALLOC_LOAD
|| alloctype
== VDEV_ALLOC_L2CACHE
||
648 alloctype
== VDEV_ALLOC_ROOTPOOL
)) {
649 if (alloctype
== VDEV_ALLOC_LOAD
) {
650 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DTL
,
651 &vd
->vdev_dtl_object
);
652 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_UNSPARE
,
656 if (alloctype
== VDEV_ALLOC_ROOTPOOL
) {
659 if (nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_IS_SPARE
,
660 &spare
) == 0 && spare
)
664 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_OFFLINE
,
667 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_RESILVER_TXG
,
668 &vd
->vdev_resilver_txg
);
671 * When importing a pool, we want to ignore the persistent fault
672 * state, as the diagnosis made on another system may not be
673 * valid in the current context. Local vdevs will
674 * remain in the faulted state.
676 if (spa_load_state(spa
) == SPA_LOAD_OPEN
) {
677 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_FAULTED
,
679 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_DEGRADED
,
681 (void) nvlist_lookup_uint64(nv
, ZPOOL_CONFIG_REMOVED
,
684 if (vd
->vdev_faulted
|| vd
->vdev_degraded
) {
688 VDEV_AUX_ERR_EXCEEDED
;
689 if (nvlist_lookup_string(nv
,
690 ZPOOL_CONFIG_AUX_STATE
, &aux
) == 0 &&
691 strcmp(aux
, "external") == 0)
692 vd
->vdev_label_aux
= VDEV_AUX_EXTERNAL
;
698 * Add ourselves to the parent's list of children.
700 vdev_add_child(parent
, vd
);
708 vdev_free(vdev_t
*vd
)
710 spa_t
*spa
= vd
->vdev_spa
;
713 * vdev_free() implies closing the vdev first. This is simpler than
714 * trying to ensure complicated semantics for all callers.
718 ASSERT(!list_link_active(&vd
->vdev_config_dirty_node
));
719 ASSERT(!list_link_active(&vd
->vdev_state_dirty_node
));
724 for (int c
= 0; c
< vd
->vdev_children
; c
++)
725 vdev_free(vd
->vdev_child
[c
]);
727 ASSERT(vd
->vdev_child
== NULL
);
728 ASSERT(vd
->vdev_guid_sum
== vd
->vdev_guid
);
731 * Discard allocation state.
733 if (vd
->vdev_mg
!= NULL
) {
734 vdev_metaslab_fini(vd
);
735 metaslab_group_destroy(vd
->vdev_mg
);
738 ASSERT0(vd
->vdev_stat
.vs_space
);
739 ASSERT0(vd
->vdev_stat
.vs_dspace
);
740 ASSERT0(vd
->vdev_stat
.vs_alloc
);
743 * Remove this vdev from its parent's child list.
745 vdev_remove_child(vd
->vdev_parent
, vd
);
747 ASSERT(vd
->vdev_parent
== NULL
);
750 * Clean up vdev structure.
756 spa_strfree(vd
->vdev_path
);
758 spa_strfree(vd
->vdev_devid
);
759 if (vd
->vdev_physpath
)
760 spa_strfree(vd
->vdev_physpath
);
762 spa_strfree(vd
->vdev_fru
);
764 if (vd
->vdev_isspare
)
765 spa_spare_remove(vd
);
766 if (vd
->vdev_isl2cache
)
767 spa_l2cache_remove(vd
);
769 txg_list_destroy(&vd
->vdev_ms_list
);
770 txg_list_destroy(&vd
->vdev_dtl_list
);
772 mutex_enter(&vd
->vdev_dtl_lock
);
773 space_map_close(vd
->vdev_dtl_sm
);
774 for (int t
= 0; t
< DTL_TYPES
; t
++) {
775 range_tree_vacate(vd
->vdev_dtl
[t
], NULL
, NULL
);
776 range_tree_destroy(vd
->vdev_dtl
[t
]);
778 mutex_exit(&vd
->vdev_dtl_lock
);
780 EQUIV(vd
->vdev_indirect_births
!= NULL
,
781 vd
->vdev_indirect_mapping
!= NULL
);
782 if (vd
->vdev_indirect_births
!= NULL
) {
783 vdev_indirect_mapping_close(vd
->vdev_indirect_mapping
);
784 vdev_indirect_births_close(vd
->vdev_indirect_births
);
787 if (vd
->vdev_obsolete_sm
!= NULL
) {
788 ASSERT(vd
->vdev_removing
||
789 vd
->vdev_ops
== &vdev_indirect_ops
);
790 space_map_close(vd
->vdev_obsolete_sm
);
791 vd
->vdev_obsolete_sm
= NULL
;
793 range_tree_destroy(vd
->vdev_obsolete_segments
);
794 rw_destroy(&vd
->vdev_indirect_rwlock
);
795 mutex_destroy(&vd
->vdev_obsolete_lock
);
797 mutex_destroy(&vd
->vdev_queue_lock
);
798 mutex_destroy(&vd
->vdev_dtl_lock
);
799 mutex_destroy(&vd
->vdev_stat_lock
);
800 mutex_destroy(&vd
->vdev_probe_lock
);
802 if (vd
== spa
->spa_root_vdev
)
803 spa
->spa_root_vdev
= NULL
;
805 kmem_free(vd
, sizeof (vdev_t
));
809 * Transfer top-level vdev state from svd to tvd.
812 vdev_top_transfer(vdev_t
*svd
, vdev_t
*tvd
)
814 spa_t
*spa
= svd
->vdev_spa
;
819 ASSERT(tvd
== tvd
->vdev_top
);
821 tvd
->vdev_ms_array
= svd
->vdev_ms_array
;
822 tvd
->vdev_ms_shift
= svd
->vdev_ms_shift
;
823 tvd
->vdev_ms_count
= svd
->vdev_ms_count
;
824 tvd
->vdev_top_zap
= svd
->vdev_top_zap
;
826 svd
->vdev_ms_array
= 0;
827 svd
->vdev_ms_shift
= 0;
828 svd
->vdev_ms_count
= 0;
829 svd
->vdev_top_zap
= 0;
832 ASSERT3P(tvd
->vdev_mg
, ==, svd
->vdev_mg
);
833 tvd
->vdev_mg
= svd
->vdev_mg
;
834 tvd
->vdev_ms
= svd
->vdev_ms
;
839 if (tvd
->vdev_mg
!= NULL
)
840 tvd
->vdev_mg
->mg_vd
= tvd
;
842 tvd
->vdev_stat
.vs_alloc
= svd
->vdev_stat
.vs_alloc
;
843 tvd
->vdev_stat
.vs_space
= svd
->vdev_stat
.vs_space
;
844 tvd
->vdev_stat
.vs_dspace
= svd
->vdev_stat
.vs_dspace
;
846 svd
->vdev_stat
.vs_alloc
= 0;
847 svd
->vdev_stat
.vs_space
= 0;
848 svd
->vdev_stat
.vs_dspace
= 0;
850 for (t
= 0; t
< TXG_SIZE
; t
++) {
851 while ((msp
= txg_list_remove(&svd
->vdev_ms_list
, t
)) != NULL
)
852 (void) txg_list_add(&tvd
->vdev_ms_list
, msp
, t
);
853 while ((vd
= txg_list_remove(&svd
->vdev_dtl_list
, t
)) != NULL
)
854 (void) txg_list_add(&tvd
->vdev_dtl_list
, vd
, t
);
855 if (txg_list_remove_this(&spa
->spa_vdev_txg_list
, svd
, t
))
856 (void) txg_list_add(&spa
->spa_vdev_txg_list
, tvd
, t
);
859 if (list_link_active(&svd
->vdev_config_dirty_node
)) {
860 vdev_config_clean(svd
);
861 vdev_config_dirty(tvd
);
864 if (list_link_active(&svd
->vdev_state_dirty_node
)) {
865 vdev_state_clean(svd
);
866 vdev_state_dirty(tvd
);
869 tvd
->vdev_deflate_ratio
= svd
->vdev_deflate_ratio
;
870 svd
->vdev_deflate_ratio
= 0;
872 tvd
->vdev_islog
= svd
->vdev_islog
;
877 vdev_top_update(vdev_t
*tvd
, vdev_t
*vd
)
884 for (int c
= 0; c
< vd
->vdev_children
; c
++)
885 vdev_top_update(tvd
, vd
->vdev_child
[c
]);
889 * Add a mirror/replacing vdev above an existing vdev.
892 vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
)
894 spa_t
*spa
= cvd
->vdev_spa
;
895 vdev_t
*pvd
= cvd
->vdev_parent
;
898 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
900 mvd
= vdev_alloc_common(spa
, cvd
->vdev_id
, 0, ops
);
902 mvd
->vdev_asize
= cvd
->vdev_asize
;
903 mvd
->vdev_min_asize
= cvd
->vdev_min_asize
;
904 mvd
->vdev_max_asize
= cvd
->vdev_max_asize
;
905 mvd
->vdev_psize
= cvd
->vdev_psize
;
906 mvd
->vdev_ashift
= cvd
->vdev_ashift
;
907 mvd
->vdev_state
= cvd
->vdev_state
;
908 mvd
->vdev_crtxg
= cvd
->vdev_crtxg
;
910 vdev_remove_child(pvd
, cvd
);
911 vdev_add_child(pvd
, mvd
);
912 cvd
->vdev_id
= mvd
->vdev_children
;
913 vdev_add_child(mvd
, cvd
);
914 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
916 if (mvd
== mvd
->vdev_top
)
917 vdev_top_transfer(cvd
, mvd
);
923 * Remove a 1-way mirror/replacing vdev from the tree.
926 vdev_remove_parent(vdev_t
*cvd
)
928 vdev_t
*mvd
= cvd
->vdev_parent
;
929 vdev_t
*pvd
= mvd
->vdev_parent
;
931 ASSERT(spa_config_held(cvd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
933 ASSERT(mvd
->vdev_children
== 1);
934 ASSERT(mvd
->vdev_ops
== &vdev_mirror_ops
||
935 mvd
->vdev_ops
== &vdev_replacing_ops
||
936 mvd
->vdev_ops
== &vdev_spare_ops
);
937 cvd
->vdev_ashift
= mvd
->vdev_ashift
;
939 vdev_remove_child(mvd
, cvd
);
940 vdev_remove_child(pvd
, mvd
);
943 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid.
944 * Otherwise, we could have detached an offline device, and when we
945 * go to import the pool we'll think we have two top-level vdevs,
946 * instead of a different version of the same top-level vdev.
948 if (mvd
->vdev_top
== mvd
) {
949 uint64_t guid_delta
= mvd
->vdev_guid
- cvd
->vdev_guid
;
950 cvd
->vdev_orig_guid
= cvd
->vdev_guid
;
951 cvd
->vdev_guid
+= guid_delta
;
952 cvd
->vdev_guid_sum
+= guid_delta
;
954 cvd
->vdev_id
= mvd
->vdev_id
;
955 vdev_add_child(pvd
, cvd
);
956 vdev_top_update(cvd
->vdev_top
, cvd
->vdev_top
);
958 if (cvd
== cvd
->vdev_top
)
959 vdev_top_transfer(mvd
, cvd
);
961 ASSERT(mvd
->vdev_children
== 0);
966 vdev_metaslab_init(vdev_t
*vd
, uint64_t txg
)
968 spa_t
*spa
= vd
->vdev_spa
;
969 objset_t
*mos
= spa
->spa_meta_objset
;
971 uint64_t oldc
= vd
->vdev_ms_count
;
972 uint64_t newc
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
976 ASSERT(txg
== 0 || spa_config_held(spa
, SCL_ALLOC
, RW_WRITER
));
979 * This vdev is not being allocated from yet or is a hole.
981 if (vd
->vdev_ms_shift
== 0)
984 ASSERT(!vd
->vdev_ishole
);
986 ASSERT(oldc
<= newc
);
988 mspp
= kmem_zalloc(newc
* sizeof (*mspp
), KM_SLEEP
);
991 bcopy(vd
->vdev_ms
, mspp
, oldc
* sizeof (*mspp
));
992 kmem_free(vd
->vdev_ms
, oldc
* sizeof (*mspp
));
996 vd
->vdev_ms_count
= newc
;
998 for (m
= oldc
; m
< newc
; m
++) {
1002 * vdev_ms_array may be 0 if we are creating the "fake"
1003 * metaslabs for an indirect vdev for zdb's leak detection.
1004 * See zdb_leak_init().
1006 if (txg
== 0 && vd
->vdev_ms_array
!= 0) {
1007 error
= dmu_read(mos
, vd
->vdev_ms_array
,
1008 m
* sizeof (uint64_t), sizeof (uint64_t), &object
,
1011 vdev_dbgmsg(vd
, "unable to read the metaslab "
1012 "array [error=%d]", error
);
1017 error
= metaslab_init(vd
->vdev_mg
, m
, object
, txg
,
1020 vdev_dbgmsg(vd
, "metaslab_init failed [error=%d]",
1027 spa_config_enter(spa
, SCL_ALLOC
, FTAG
, RW_WRITER
);
1030 * If the vdev is being removed we don't activate
1031 * the metaslabs since we want to ensure that no new
1032 * allocations are performed on this device.
1034 if (oldc
== 0 && !vd
->vdev_removing
)
1035 metaslab_group_activate(vd
->vdev_mg
);
1038 spa_config_exit(spa
, SCL_ALLOC
, FTAG
);
1044 vdev_metaslab_fini(vdev_t
*vd
)
1046 if (vd
->vdev_ms
!= NULL
) {
1047 uint64_t count
= vd
->vdev_ms_count
;
1049 metaslab_group_passivate(vd
->vdev_mg
);
1050 for (uint64_t m
= 0; m
< count
; m
++) {
1051 metaslab_t
*msp
= vd
->vdev_ms
[m
];
1056 kmem_free(vd
->vdev_ms
, count
* sizeof (metaslab_t
*));
1059 vd
->vdev_ms_count
= 0;
1061 ASSERT0(vd
->vdev_ms_count
);
1064 typedef struct vdev_probe_stats
{
1065 boolean_t vps_readable
;
1066 boolean_t vps_writeable
;
1068 } vdev_probe_stats_t
;
1071 vdev_probe_done(zio_t
*zio
)
1073 spa_t
*spa
= zio
->io_spa
;
1074 vdev_t
*vd
= zio
->io_vd
;
1075 vdev_probe_stats_t
*vps
= zio
->io_private
;
1077 ASSERT(vd
->vdev_probe_zio
!= NULL
);
1079 if (zio
->io_type
== ZIO_TYPE_READ
) {
1080 if (zio
->io_error
== 0)
1081 vps
->vps_readable
= 1;
1082 if (zio
->io_error
== 0 && spa_writeable(spa
)) {
1083 zio_nowait(zio_write_phys(vd
->vdev_probe_zio
, vd
,
1084 zio
->io_offset
, zio
->io_size
, zio
->io_abd
,
1085 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
1086 ZIO_PRIORITY_SYNC_WRITE
, vps
->vps_flags
, B_TRUE
));
1088 abd_free(zio
->io_abd
);
1090 } else if (zio
->io_type
== ZIO_TYPE_WRITE
) {
1091 if (zio
->io_error
== 0)
1092 vps
->vps_writeable
= 1;
1093 abd_free(zio
->io_abd
);
1094 } else if (zio
->io_type
== ZIO_TYPE_NULL
) {
1097 vd
->vdev_cant_read
|= !vps
->vps_readable
;
1098 vd
->vdev_cant_write
|= !vps
->vps_writeable
;
1100 if (vdev_readable(vd
) &&
1101 (vdev_writeable(vd
) || !spa_writeable(spa
))) {
1104 ASSERT(zio
->io_error
!= 0);
1105 vdev_dbgmsg(vd
, "failed probe");
1106 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE
,
1107 spa
, vd
, NULL
, 0, 0);
1108 zio
->io_error
= SET_ERROR(ENXIO
);
1111 mutex_enter(&vd
->vdev_probe_lock
);
1112 ASSERT(vd
->vdev_probe_zio
== zio
);
1113 vd
->vdev_probe_zio
= NULL
;
1114 mutex_exit(&vd
->vdev_probe_lock
);
1116 zio_link_t
*zl
= NULL
;
1117 while ((pio
= zio_walk_parents(zio
, &zl
)) != NULL
)
1118 if (!vdev_accessible(vd
, pio
))
1119 pio
->io_error
= SET_ERROR(ENXIO
);
1121 kmem_free(vps
, sizeof (*vps
));
1126 * Determine whether this device is accessible.
1128 * Read and write to several known locations: the pad regions of each
1129 * vdev label but the first, which we leave alone in case it contains
1133 vdev_probe(vdev_t
*vd
, zio_t
*zio
)
1135 spa_t
*spa
= vd
->vdev_spa
;
1136 vdev_probe_stats_t
*vps
= NULL
;
1139 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1142 * Don't probe the probe.
1144 if (zio
&& (zio
->io_flags
& ZIO_FLAG_PROBE
))
1148 * To prevent 'probe storms' when a device fails, we create
1149 * just one probe i/o at a time. All zios that want to probe
1150 * this vdev will become parents of the probe io.
1152 mutex_enter(&vd
->vdev_probe_lock
);
1154 if ((pio
= vd
->vdev_probe_zio
) == NULL
) {
1155 vps
= kmem_zalloc(sizeof (*vps
), KM_SLEEP
);
1157 vps
->vps_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_PROBE
|
1158 ZIO_FLAG_DONT_CACHE
| ZIO_FLAG_DONT_AGGREGATE
|
1161 if (spa_config_held(spa
, SCL_ZIO
, RW_WRITER
)) {
1163 * vdev_cant_read and vdev_cant_write can only
1164 * transition from TRUE to FALSE when we have the
1165 * SCL_ZIO lock as writer; otherwise they can only
1166 * transition from FALSE to TRUE. This ensures that
1167 * any zio looking at these values can assume that
1168 * failures persist for the life of the I/O. That's
1169 * important because when a device has intermittent
1170 * connectivity problems, we want to ensure that
1171 * they're ascribed to the device (ENXIO) and not
1174 * Since we hold SCL_ZIO as writer here, clear both
1175 * values so the probe can reevaluate from first
1178 vps
->vps_flags
|= ZIO_FLAG_CONFIG_WRITER
;
1179 vd
->vdev_cant_read
= B_FALSE
;
1180 vd
->vdev_cant_write
= B_FALSE
;
1183 vd
->vdev_probe_zio
= pio
= zio_null(NULL
, spa
, vd
,
1184 vdev_probe_done
, vps
,
1185 vps
->vps_flags
| ZIO_FLAG_DONT_PROPAGATE
);
1188 * We can't change the vdev state in this context, so we
1189 * kick off an async task to do it on our behalf.
1192 vd
->vdev_probe_wanted
= B_TRUE
;
1193 spa_async_request(spa
, SPA_ASYNC_PROBE
);
1198 zio_add_child(zio
, pio
);
1200 mutex_exit(&vd
->vdev_probe_lock
);
1203 ASSERT(zio
!= NULL
);
1207 for (int l
= 1; l
< VDEV_LABELS
; l
++) {
1208 zio_nowait(zio_read_phys(pio
, vd
,
1209 vdev_label_offset(vd
->vdev_psize
, l
,
1210 offsetof(vdev_label_t
, vl_pad2
)), VDEV_PAD_SIZE
,
1211 abd_alloc_for_io(VDEV_PAD_SIZE
, B_TRUE
),
1212 ZIO_CHECKSUM_OFF
, vdev_probe_done
, vps
,
1213 ZIO_PRIORITY_SYNC_READ
, vps
->vps_flags
, B_TRUE
));
1224 vdev_open_child(void *arg
)
1228 vd
->vdev_open_thread
= curthread
;
1229 vd
->vdev_open_error
= vdev_open(vd
);
1230 vd
->vdev_open_thread
= NULL
;
1234 vdev_uses_zvols(vdev_t
*vd
)
1236 if (vd
->vdev_path
&& strncmp(vd
->vdev_path
, ZVOL_DIR
,
1237 strlen(ZVOL_DIR
)) == 0)
1239 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1240 if (vdev_uses_zvols(vd
->vdev_child
[c
]))
1246 vdev_open_children(vdev_t
*vd
)
1249 int children
= vd
->vdev_children
;
1252 * in order to handle pools on top of zvols, do the opens
1253 * in a single thread so that the same thread holds the
1254 * spa_namespace_lock
1256 if (vdev_uses_zvols(vd
)) {
1257 for (int c
= 0; c
< children
; c
++)
1258 vd
->vdev_child
[c
]->vdev_open_error
=
1259 vdev_open(vd
->vdev_child
[c
]);
1262 tq
= taskq_create("vdev_open", children
, minclsyspri
,
1263 children
, children
, TASKQ_PREPOPULATE
);
1265 for (int c
= 0; c
< children
; c
++)
1266 VERIFY(taskq_dispatch(tq
, vdev_open_child
, vd
->vdev_child
[c
],
1273 * Compute the raidz-deflation ratio. Note, we hard-code
1274 * in 128k (1 << 17) because it is the "typical" blocksize.
1275 * Even though SPA_MAXBLOCKSIZE changed, this algorithm can not change,
1276 * otherwise it would inconsistently account for existing bp's.
1279 vdev_set_deflate_ratio(vdev_t
*vd
)
1281 if (vd
== vd
->vdev_top
&& !vd
->vdev_ishole
&& vd
->vdev_ashift
!= 0) {
1282 vd
->vdev_deflate_ratio
= (1 << 17) /
1283 (vdev_psize_to_asize(vd
, 1 << 17) >> SPA_MINBLOCKSHIFT
);
1288 * Prepare a virtual device for access.
1291 vdev_open(vdev_t
*vd
)
1293 spa_t
*spa
= vd
->vdev_spa
;
1296 uint64_t max_osize
= 0;
1297 uint64_t asize
, max_asize
, psize
;
1298 uint64_t ashift
= 0;
1300 ASSERT(vd
->vdev_open_thread
== curthread
||
1301 spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1302 ASSERT(vd
->vdev_state
== VDEV_STATE_CLOSED
||
1303 vd
->vdev_state
== VDEV_STATE_CANT_OPEN
||
1304 vd
->vdev_state
== VDEV_STATE_OFFLINE
);
1306 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1307 vd
->vdev_cant_read
= B_FALSE
;
1308 vd
->vdev_cant_write
= B_FALSE
;
1309 vd
->vdev_min_asize
= vdev_get_min_asize(vd
);
1312 * If this vdev is not removed, check its fault status. If it's
1313 * faulted, bail out of the open.
1315 if (!vd
->vdev_removed
&& vd
->vdev_faulted
) {
1316 ASSERT(vd
->vdev_children
== 0);
1317 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1318 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1319 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1320 vd
->vdev_label_aux
);
1321 return (SET_ERROR(ENXIO
));
1322 } else if (vd
->vdev_offline
) {
1323 ASSERT(vd
->vdev_children
== 0);
1324 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
, VDEV_AUX_NONE
);
1325 return (SET_ERROR(ENXIO
));
1328 error
= vd
->vdev_ops
->vdev_op_open(vd
, &osize
, &max_osize
, &ashift
);
1331 * Reset the vdev_reopening flag so that we actually close
1332 * the vdev on error.
1334 vd
->vdev_reopening
= B_FALSE
;
1335 if (zio_injection_enabled
&& error
== 0)
1336 error
= zio_handle_device_injection(vd
, NULL
, ENXIO
);
1339 if (vd
->vdev_removed
&&
1340 vd
->vdev_stat
.vs_aux
!= VDEV_AUX_OPEN_FAILED
)
1341 vd
->vdev_removed
= B_FALSE
;
1343 if (vd
->vdev_stat
.vs_aux
== VDEV_AUX_CHILDREN_OFFLINE
) {
1344 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_OFFLINE
,
1345 vd
->vdev_stat
.vs_aux
);
1347 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1348 vd
->vdev_stat
.vs_aux
);
1353 vd
->vdev_removed
= B_FALSE
;
1356 * Recheck the faulted flag now that we have confirmed that
1357 * the vdev is accessible. If we're faulted, bail.
1359 if (vd
->vdev_faulted
) {
1360 ASSERT(vd
->vdev_children
== 0);
1361 ASSERT(vd
->vdev_label_aux
== VDEV_AUX_ERR_EXCEEDED
||
1362 vd
->vdev_label_aux
== VDEV_AUX_EXTERNAL
);
1363 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1364 vd
->vdev_label_aux
);
1365 return (SET_ERROR(ENXIO
));
1368 if (vd
->vdev_degraded
) {
1369 ASSERT(vd
->vdev_children
== 0);
1370 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1371 VDEV_AUX_ERR_EXCEEDED
);
1373 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_HEALTHY
, 0);
1377 * For hole or missing vdevs we just return success.
1379 if (vd
->vdev_ishole
|| vd
->vdev_ops
== &vdev_missing_ops
)
1382 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
1383 if (vd
->vdev_child
[c
]->vdev_state
!= VDEV_STATE_HEALTHY
) {
1384 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_DEGRADED
,
1390 osize
= P2ALIGN(osize
, (uint64_t)sizeof (vdev_label_t
));
1391 max_osize
= P2ALIGN(max_osize
, (uint64_t)sizeof (vdev_label_t
));
1393 if (vd
->vdev_children
== 0) {
1394 if (osize
< SPA_MINDEVSIZE
) {
1395 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1396 VDEV_AUX_TOO_SMALL
);
1397 return (SET_ERROR(EOVERFLOW
));
1400 asize
= osize
- (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
);
1401 max_asize
= max_osize
- (VDEV_LABEL_START_SIZE
+
1402 VDEV_LABEL_END_SIZE
);
1404 if (vd
->vdev_parent
!= NULL
&& osize
< SPA_MINDEVSIZE
-
1405 (VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
)) {
1406 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1407 VDEV_AUX_TOO_SMALL
);
1408 return (SET_ERROR(EOVERFLOW
));
1412 max_asize
= max_osize
;
1415 vd
->vdev_psize
= psize
;
1418 * Make sure the allocatable size hasn't shrunk too much.
1420 if (asize
< vd
->vdev_min_asize
) {
1421 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1422 VDEV_AUX_BAD_LABEL
);
1423 return (SET_ERROR(EINVAL
));
1426 if (vd
->vdev_asize
== 0) {
1428 * This is the first-ever open, so use the computed values.
1429 * For testing purposes, a higher ashift can be requested.
1431 vd
->vdev_asize
= asize
;
1432 vd
->vdev_max_asize
= max_asize
;
1433 vd
->vdev_ashift
= MAX(ashift
, vd
->vdev_ashift
);
1436 * Detect if the alignment requirement has increased.
1437 * We don't want to make the pool unavailable, just
1438 * issue a warning instead.
1440 if (ashift
> vd
->vdev_top
->vdev_ashift
&&
1441 vd
->vdev_ops
->vdev_op_leaf
) {
1443 "Disk, '%s', has a block alignment that is "
1444 "larger than the pool's alignment\n",
1447 vd
->vdev_max_asize
= max_asize
;
1451 * If all children are healthy we update asize if either:
1452 * The asize has increased, due to a device expansion caused by dynamic
1453 * LUN growth or vdev replacement, and automatic expansion is enabled;
1454 * making the additional space available.
1456 * The asize has decreased, due to a device shrink usually caused by a
1457 * vdev replace with a smaller device. This ensures that calculations
1458 * based of max_asize and asize e.g. esize are always valid. It's safe
1459 * to do this as we've already validated that asize is greater than
1462 if (vd
->vdev_state
== VDEV_STATE_HEALTHY
&&
1463 ((asize
> vd
->vdev_asize
&&
1464 (vd
->vdev_expanding
|| spa
->spa_autoexpand
)) ||
1465 (asize
< vd
->vdev_asize
)))
1466 vd
->vdev_asize
= asize
;
1468 vdev_set_min_asize(vd
);
1471 * Ensure we can issue some IO before declaring the
1472 * vdev open for business.
1474 if (vd
->vdev_ops
->vdev_op_leaf
&&
1475 (error
= zio_wait(vdev_probe(vd
, NULL
))) != 0) {
1476 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_FAULTED
,
1477 VDEV_AUX_ERR_EXCEEDED
);
1481 if (vd
->vdev_top
== vd
&& vd
->vdev_ashift
!= 0 &&
1482 !vd
->vdev_isl2cache
&& !vd
->vdev_islog
) {
1483 if (vd
->vdev_ashift
> spa
->spa_max_ashift
)
1484 spa
->spa_max_ashift
= vd
->vdev_ashift
;
1485 if (vd
->vdev_ashift
< spa
->spa_min_ashift
)
1486 spa
->spa_min_ashift
= vd
->vdev_ashift
;
1490 * Track the min and max ashift values for normal data devices.
1492 if (vd
->vdev_top
== vd
&& vd
->vdev_ashift
!= 0 &&
1493 !vd
->vdev_islog
&& vd
->vdev_aux
== NULL
) {
1494 if (vd
->vdev_ashift
> spa
->spa_max_ashift
)
1495 spa
->spa_max_ashift
= vd
->vdev_ashift
;
1496 if (vd
->vdev_ashift
< spa
->spa_min_ashift
)
1497 spa
->spa_min_ashift
= vd
->vdev_ashift
;
1501 * If a leaf vdev has a DTL, and seems healthy, then kick off a
1502 * resilver. But don't do this if we are doing a reopen for a scrub,
1503 * since this would just restart the scrub we are already doing.
1505 if (vd
->vdev_ops
->vdev_op_leaf
&& !spa
->spa_scrub_reopen
&&
1506 vdev_resilver_needed(vd
, NULL
, NULL
))
1507 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
1513 * Called once the vdevs are all opened, this routine validates the label
1514 * contents. This needs to be done before vdev_load() so that we don't
1515 * inadvertently do repair I/Os to the wrong device.
1517 * This function will only return failure if one of the vdevs indicates that it
1518 * has since been destroyed or exported. This is only possible if
1519 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state
1520 * will be updated but the function will return 0.
1523 vdev_validate(vdev_t
*vd
)
1525 spa_t
*spa
= vd
->vdev_spa
;
1527 uint64_t guid
= 0, aux_guid
= 0, top_guid
;
1532 if (vdev_validate_skip
)
1535 for (uint64_t c
= 0; c
< vd
->vdev_children
; c
++)
1536 if (vdev_validate(vd
->vdev_child
[c
]) != 0)
1537 return (SET_ERROR(EBADF
));
1540 * If the device has already failed, or was marked offline, don't do
1541 * any further validation. Otherwise, label I/O will fail and we will
1542 * overwrite the previous state.
1544 if (!vd
->vdev_ops
->vdev_op_leaf
|| !vdev_readable(vd
))
1548 * If we are performing an extreme rewind, we allow for a label that
1549 * was modified at a point after the current txg.
1551 if (spa
->spa_extreme_rewind
|| spa_last_synced_txg(spa
) == 0)
1554 txg
= spa_last_synced_txg(spa
);
1556 if ((label
= vdev_label_read_config(vd
, txg
)) == NULL
) {
1557 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
1558 VDEV_AUX_BAD_LABEL
);
1559 vdev_dbgmsg(vd
, "vdev_validate: failed reading config");
1564 * Determine if this vdev has been split off into another
1565 * pool. If so, then refuse to open it.
1567 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_SPLIT_GUID
,
1568 &aux_guid
) == 0 && aux_guid
== spa_guid(spa
)) {
1569 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1570 VDEV_AUX_SPLIT_POOL
);
1572 vdev_dbgmsg(vd
, "vdev_validate: vdev split into other pool");
1576 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_GUID
, &guid
) != 0) {
1577 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1578 VDEV_AUX_CORRUPT_DATA
);
1580 vdev_dbgmsg(vd
, "vdev_validate: '%s' missing from label",
1581 ZPOOL_CONFIG_POOL_GUID
);
1586 * If config is not trusted then ignore the spa guid check. This is
1587 * necessary because if the machine crashed during a re-guid the new
1588 * guid might have been written to all of the vdev labels, but not the
1589 * cached config. The check will be performed again once we have the
1590 * trusted config from the MOS.
1592 if (spa
->spa_trust_config
&& guid
!= spa_guid(spa
)) {
1593 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1594 VDEV_AUX_CORRUPT_DATA
);
1596 vdev_dbgmsg(vd
, "vdev_validate: vdev label pool_guid doesn't "
1597 "match config (%llu != %llu)", (u_longlong_t
)guid
,
1598 (u_longlong_t
)spa_guid(spa
));
1602 if (nvlist_lookup_nvlist(label
, ZPOOL_CONFIG_VDEV_TREE
, &nvl
)
1603 != 0 || nvlist_lookup_uint64(nvl
, ZPOOL_CONFIG_ORIG_GUID
,
1607 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0) {
1608 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1609 VDEV_AUX_CORRUPT_DATA
);
1611 vdev_dbgmsg(vd
, "vdev_validate: '%s' missing from label",
1616 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_TOP_GUID
, &top_guid
)
1618 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1619 VDEV_AUX_CORRUPT_DATA
);
1621 vdev_dbgmsg(vd
, "vdev_validate: '%s' missing from label",
1622 ZPOOL_CONFIG_TOP_GUID
);
1627 * If this vdev just became a top-level vdev because its sibling was
1628 * detached, it will have adopted the parent's vdev guid -- but the
1629 * label may or may not be on disk yet. Fortunately, either version
1630 * of the label will have the same top guid, so if we're a top-level
1631 * vdev, we can safely compare to that instead.
1632 * However, if the config comes from a cachefile that failed to update
1633 * after the detach, a top-level vdev will appear as a non top-level
1634 * vdev in the config. Also relax the constraints if we perform an
1637 * If we split this vdev off instead, then we also check the
1638 * original pool's guid. We don't want to consider the vdev
1639 * corrupt if it is partway through a split operation.
1641 if (vd
->vdev_guid
!= guid
&& vd
->vdev_guid
!= aux_guid
) {
1642 boolean_t mismatch
= B_FALSE
;
1643 if (spa
->spa_trust_config
&& !spa
->spa_extreme_rewind
) {
1644 if (vd
!= vd
->vdev_top
|| vd
->vdev_guid
!= top_guid
)
1647 if (vd
->vdev_guid
!= top_guid
&&
1648 vd
->vdev_top
->vdev_guid
!= guid
)
1653 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1654 VDEV_AUX_CORRUPT_DATA
);
1656 vdev_dbgmsg(vd
, "vdev_validate: config guid "
1657 "doesn't match label guid");
1658 vdev_dbgmsg(vd
, "CONFIG: guid %llu, top_guid %llu",
1659 (u_longlong_t
)vd
->vdev_guid
,
1660 (u_longlong_t
)vd
->vdev_top
->vdev_guid
);
1661 vdev_dbgmsg(vd
, "LABEL: guid %llu, top_guid %llu, "
1662 "aux_guid %llu", (u_longlong_t
)guid
,
1663 (u_longlong_t
)top_guid
, (u_longlong_t
)aux_guid
);
1668 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
,
1670 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
1671 VDEV_AUX_CORRUPT_DATA
);
1673 vdev_dbgmsg(vd
, "vdev_validate: '%s' missing from label",
1674 ZPOOL_CONFIG_POOL_STATE
);
1681 * If this is a verbatim import, no need to check the
1682 * state of the pool.
1684 if (!(spa
->spa_import_flags
& ZFS_IMPORT_VERBATIM
) &&
1685 spa_load_state(spa
) == SPA_LOAD_OPEN
&&
1686 state
!= POOL_STATE_ACTIVE
) {
1687 vdev_dbgmsg(vd
, "vdev_validate: invalid pool state (%llu) "
1688 "for spa %s", (u_longlong_t
)state
, spa
->spa_name
);
1689 return (SET_ERROR(EBADF
));
1693 * If we were able to open and validate a vdev that was
1694 * previously marked permanently unavailable, clear that state
1697 if (vd
->vdev_not_present
)
1698 vd
->vdev_not_present
= 0;
1704 vdev_copy_path_impl(vdev_t
*svd
, vdev_t
*dvd
)
1706 if (svd
->vdev_path
!= NULL
&& dvd
->vdev_path
!= NULL
) {
1707 if (strcmp(svd
->vdev_path
, dvd
->vdev_path
) != 0) {
1708 zfs_dbgmsg("vdev_copy_path: vdev %llu: path changed "
1709 "from '%s' to '%s'", (u_longlong_t
)dvd
->vdev_guid
,
1710 dvd
->vdev_path
, svd
->vdev_path
);
1711 spa_strfree(dvd
->vdev_path
);
1712 dvd
->vdev_path
= spa_strdup(svd
->vdev_path
);
1714 } else if (svd
->vdev_path
!= NULL
) {
1715 dvd
->vdev_path
= spa_strdup(svd
->vdev_path
);
1716 zfs_dbgmsg("vdev_copy_path: vdev %llu: path set to '%s'",
1717 (u_longlong_t
)dvd
->vdev_guid
, dvd
->vdev_path
);
1722 * Recursively copy vdev paths from one vdev to another. Source and destination
1723 * vdev trees must have same geometry otherwise return error. Intended to copy
1724 * paths from userland config into MOS config.
1727 vdev_copy_path_strict(vdev_t
*svd
, vdev_t
*dvd
)
1729 if ((svd
->vdev_ops
== &vdev_missing_ops
) ||
1730 (svd
->vdev_ishole
&& dvd
->vdev_ishole
) ||
1731 (dvd
->vdev_ops
== &vdev_indirect_ops
))
1734 if (svd
->vdev_ops
!= dvd
->vdev_ops
) {
1735 vdev_dbgmsg(svd
, "vdev_copy_path: vdev type mismatch: %s != %s",
1736 svd
->vdev_ops
->vdev_op_type
, dvd
->vdev_ops
->vdev_op_type
);
1737 return (SET_ERROR(EINVAL
));
1740 if (svd
->vdev_guid
!= dvd
->vdev_guid
) {
1741 vdev_dbgmsg(svd
, "vdev_copy_path: guids mismatch (%llu != "
1742 "%llu)", (u_longlong_t
)svd
->vdev_guid
,
1743 (u_longlong_t
)dvd
->vdev_guid
);
1744 return (SET_ERROR(EINVAL
));
1747 if (svd
->vdev_children
!= dvd
->vdev_children
) {
1748 vdev_dbgmsg(svd
, "vdev_copy_path: children count mismatch: "
1749 "%llu != %llu", (u_longlong_t
)svd
->vdev_children
,
1750 (u_longlong_t
)dvd
->vdev_children
);
1751 return (SET_ERROR(EINVAL
));
1754 for (uint64_t i
= 0; i
< svd
->vdev_children
; i
++) {
1755 int error
= vdev_copy_path_strict(svd
->vdev_child
[i
],
1756 dvd
->vdev_child
[i
]);
1761 if (svd
->vdev_ops
->vdev_op_leaf
)
1762 vdev_copy_path_impl(svd
, dvd
);
1768 vdev_copy_path_search(vdev_t
*stvd
, vdev_t
*dvd
)
1770 ASSERT(stvd
->vdev_top
== stvd
);
1771 ASSERT3U(stvd
->vdev_id
, ==, dvd
->vdev_top
->vdev_id
);
1773 for (uint64_t i
= 0; i
< dvd
->vdev_children
; i
++) {
1774 vdev_copy_path_search(stvd
, dvd
->vdev_child
[i
]);
1777 if (!dvd
->vdev_ops
->vdev_op_leaf
|| !vdev_is_concrete(dvd
))
1781 * The idea here is that while a vdev can shift positions within
1782 * a top vdev (when replacing, attaching mirror, etc.) it cannot
1783 * step outside of it.
1785 vdev_t
*vd
= vdev_lookup_by_guid(stvd
, dvd
->vdev_guid
);
1787 if (vd
== NULL
|| vd
->vdev_ops
!= dvd
->vdev_ops
)
1790 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
1792 vdev_copy_path_impl(vd
, dvd
);
1796 * Recursively copy vdev paths from one root vdev to another. Source and
1797 * destination vdev trees may differ in geometry. For each destination leaf
1798 * vdev, search a vdev with the same guid and top vdev id in the source.
1799 * Intended to copy paths from userland config into MOS config.
1802 vdev_copy_path_relaxed(vdev_t
*srvd
, vdev_t
*drvd
)
1804 uint64_t children
= MIN(srvd
->vdev_children
, drvd
->vdev_children
);
1805 ASSERT(srvd
->vdev_ops
== &vdev_root_ops
);
1806 ASSERT(drvd
->vdev_ops
== &vdev_root_ops
);
1808 for (uint64_t i
= 0; i
< children
; i
++) {
1809 vdev_copy_path_search(srvd
->vdev_child
[i
],
1810 drvd
->vdev_child
[i
]);
1815 * Close a virtual device.
1818 vdev_close(vdev_t
*vd
)
1820 spa_t
*spa
= vd
->vdev_spa
;
1821 vdev_t
*pvd
= vd
->vdev_parent
;
1823 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1826 * If our parent is reopening, then we are as well, unless we are
1829 if (pvd
!= NULL
&& pvd
->vdev_reopening
)
1830 vd
->vdev_reopening
= (pvd
->vdev_reopening
&& !vd
->vdev_offline
);
1832 vd
->vdev_ops
->vdev_op_close(vd
);
1834 vdev_cache_purge(vd
);
1837 * We record the previous state before we close it, so that if we are
1838 * doing a reopen(), we don't generate FMA ereports if we notice that
1839 * it's still faulted.
1841 vd
->vdev_prevstate
= vd
->vdev_state
;
1843 if (vd
->vdev_offline
)
1844 vd
->vdev_state
= VDEV_STATE_OFFLINE
;
1846 vd
->vdev_state
= VDEV_STATE_CLOSED
;
1847 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
1851 vdev_hold(vdev_t
*vd
)
1853 spa_t
*spa
= vd
->vdev_spa
;
1855 ASSERT(spa_is_root(spa
));
1856 if (spa
->spa_state
== POOL_STATE_UNINITIALIZED
)
1859 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1860 vdev_hold(vd
->vdev_child
[c
]);
1862 if (vd
->vdev_ops
->vdev_op_leaf
)
1863 vd
->vdev_ops
->vdev_op_hold(vd
);
1867 vdev_rele(vdev_t
*vd
)
1869 spa_t
*spa
= vd
->vdev_spa
;
1871 ASSERT(spa_is_root(spa
));
1872 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1873 vdev_rele(vd
->vdev_child
[c
]);
1875 if (vd
->vdev_ops
->vdev_op_leaf
)
1876 vd
->vdev_ops
->vdev_op_rele(vd
);
1880 * Reopen all interior vdevs and any unopened leaves. We don't actually
1881 * reopen leaf vdevs which had previously been opened as they might deadlock
1882 * on the spa_config_lock. Instead we only obtain the leaf's physical size.
1883 * If the leaf has never been opened then open it, as usual.
1886 vdev_reopen(vdev_t
*vd
)
1888 spa_t
*spa
= vd
->vdev_spa
;
1890 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
1892 /* set the reopening flag unless we're taking the vdev offline */
1893 vd
->vdev_reopening
= !vd
->vdev_offline
;
1895 (void) vdev_open(vd
);
1898 * Call vdev_validate() here to make sure we have the same device.
1899 * Otherwise, a device with an invalid label could be successfully
1900 * opened in response to vdev_reopen().
1903 (void) vdev_validate_aux(vd
);
1904 if (vdev_readable(vd
) && vdev_writeable(vd
) &&
1905 vd
->vdev_aux
== &spa
->spa_l2cache
&&
1906 !l2arc_vdev_present(vd
))
1907 l2arc_add_vdev(spa
, vd
);
1909 (void) vdev_validate(vd
);
1913 * Reassess parent vdev's health.
1915 vdev_propagate_state(vd
);
1919 vdev_create(vdev_t
*vd
, uint64_t txg
, boolean_t isreplacing
)
1924 * Normally, partial opens (e.g. of a mirror) are allowed.
1925 * For a create, however, we want to fail the request if
1926 * there are any components we can't open.
1928 error
= vdev_open(vd
);
1930 if (error
|| vd
->vdev_state
!= VDEV_STATE_HEALTHY
) {
1932 return (error
? error
: ENXIO
);
1936 * Recursively load DTLs and initialize all labels.
1938 if ((error
= vdev_dtl_load(vd
)) != 0 ||
1939 (error
= vdev_label_init(vd
, txg
, isreplacing
?
1940 VDEV_LABEL_REPLACE
: VDEV_LABEL_CREATE
)) != 0) {
1949 vdev_metaslab_set_size(vdev_t
*vd
)
1952 * Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
1954 vd
->vdev_ms_shift
= highbit64(vd
->vdev_asize
/ metaslabs_per_vdev
);
1955 vd
->vdev_ms_shift
= MAX(vd
->vdev_ms_shift
, SPA_MAXBLOCKSHIFT
);
1959 vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
)
1961 ASSERT(vd
== vd
->vdev_top
);
1962 /* indirect vdevs don't have metaslabs or dtls */
1963 ASSERT(vdev_is_concrete(vd
) || flags
== 0);
1964 ASSERT(ISP2(flags
));
1965 ASSERT(spa_writeable(vd
->vdev_spa
));
1967 if (flags
& VDD_METASLAB
)
1968 (void) txg_list_add(&vd
->vdev_ms_list
, arg
, txg
);
1970 if (flags
& VDD_DTL
)
1971 (void) txg_list_add(&vd
->vdev_dtl_list
, arg
, txg
);
1973 (void) txg_list_add(&vd
->vdev_spa
->spa_vdev_txg_list
, vd
, txg
);
1977 vdev_dirty_leaves(vdev_t
*vd
, int flags
, uint64_t txg
)
1979 for (int c
= 0; c
< vd
->vdev_children
; c
++)
1980 vdev_dirty_leaves(vd
->vdev_child
[c
], flags
, txg
);
1982 if (vd
->vdev_ops
->vdev_op_leaf
)
1983 vdev_dirty(vd
->vdev_top
, flags
, vd
, txg
);
1989 * A vdev's DTL (dirty time log) is the set of transaction groups for which
1990 * the vdev has less than perfect replication. There are four kinds of DTL:
1992 * DTL_MISSING: txgs for which the vdev has no valid copies of the data
1994 * DTL_PARTIAL: txgs for which data is available, but not fully replicated
1996 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon
1997 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of
1998 * txgs that was scrubbed.
2000 * DTL_OUTAGE: txgs which cannot currently be read, whether due to
2001 * persistent errors or just some device being offline.
2002 * Unlike the other three, the DTL_OUTAGE map is not generally
2003 * maintained; it's only computed when needed, typically to
2004 * determine whether a device can be detached.
2006 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device
2007 * either has the data or it doesn't.
2009 * For interior vdevs such as mirror and RAID-Z the picture is more complex.
2010 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because
2011 * if any child is less than fully replicated, then so is its parent.
2012 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs,
2013 * comprising only those txgs which appear in 'maxfaults' or more children;
2014 * those are the txgs we don't have enough replication to read. For example,
2015 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2);
2016 * thus, its DTL_MISSING consists of the set of txgs that appear in more than
2017 * two child DTL_MISSING maps.
2019 * It should be clear from the above that to compute the DTLs and outage maps
2020 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps.
2021 * Therefore, that is all we keep on disk. When loading the pool, or after
2022 * a configuration change, we generate all other DTLs from first principles.
2025 vdev_dtl_dirty(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
2027 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
2029 ASSERT(t
< DTL_TYPES
);
2030 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
2031 ASSERT(spa_writeable(vd
->vdev_spa
));
2033 mutex_enter(&vd
->vdev_dtl_lock
);
2034 if (!range_tree_contains(rt
, txg
, size
))
2035 range_tree_add(rt
, txg
, size
);
2036 mutex_exit(&vd
->vdev_dtl_lock
);
2040 vdev_dtl_contains(vdev_t
*vd
, vdev_dtl_type_t t
, uint64_t txg
, uint64_t size
)
2042 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
2043 boolean_t dirty
= B_FALSE
;
2045 ASSERT(t
< DTL_TYPES
);
2046 ASSERT(vd
!= vd
->vdev_spa
->spa_root_vdev
);
2049 * While we are loading the pool, the DTLs have not been loaded yet.
2050 * Ignore the DTLs and try all devices. This avoids a recursive
2051 * mutex enter on the vdev_dtl_lock, and also makes us try hard
2052 * when loading the pool (relying on the checksum to ensure that
2053 * we get the right data -- note that we while loading, we are
2054 * only reading the MOS, which is always checksummed).
2056 if (vd
->vdev_spa
->spa_load_state
!= SPA_LOAD_NONE
)
2059 mutex_enter(&vd
->vdev_dtl_lock
);
2060 if (range_tree_space(rt
) != 0)
2061 dirty
= range_tree_contains(rt
, txg
, size
);
2062 mutex_exit(&vd
->vdev_dtl_lock
);
2068 vdev_dtl_empty(vdev_t
*vd
, vdev_dtl_type_t t
)
2070 range_tree_t
*rt
= vd
->vdev_dtl
[t
];
2073 mutex_enter(&vd
->vdev_dtl_lock
);
2074 empty
= (range_tree_space(rt
) == 0);
2075 mutex_exit(&vd
->vdev_dtl_lock
);
2081 * Returns the lowest txg in the DTL range.
2084 vdev_dtl_min(vdev_t
*vd
)
2088 ASSERT(MUTEX_HELD(&vd
->vdev_dtl_lock
));
2089 ASSERT3U(range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]), !=, 0);
2090 ASSERT0(vd
->vdev_children
);
2092 rs
= avl_first(&vd
->vdev_dtl
[DTL_MISSING
]->rt_root
);
2093 return (rs
->rs_start
- 1);
2097 * Returns the highest txg in the DTL.
2100 vdev_dtl_max(vdev_t
*vd
)
2104 ASSERT(MUTEX_HELD(&vd
->vdev_dtl_lock
));
2105 ASSERT3U(range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]), !=, 0);
2106 ASSERT0(vd
->vdev_children
);
2108 rs
= avl_last(&vd
->vdev_dtl
[DTL_MISSING
]->rt_root
);
2109 return (rs
->rs_end
);
2113 * Determine if a resilvering vdev should remove any DTL entries from
2114 * its range. If the vdev was resilvering for the entire duration of the
2115 * scan then it should excise that range from its DTLs. Otherwise, this
2116 * vdev is considered partially resilvered and should leave its DTL
2117 * entries intact. The comment in vdev_dtl_reassess() describes how we
2121 vdev_dtl_should_excise(vdev_t
*vd
)
2123 spa_t
*spa
= vd
->vdev_spa
;
2124 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
2126 ASSERT0(scn
->scn_phys
.scn_errors
);
2127 ASSERT0(vd
->vdev_children
);
2129 if (vd
->vdev_state
< VDEV_STATE_DEGRADED
)
2132 if (vd
->vdev_resilver_txg
== 0 ||
2133 range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) == 0)
2137 * When a resilver is initiated the scan will assign the scn_max_txg
2138 * value to the highest txg value that exists in all DTLs. If this
2139 * device's max DTL is not part of this scan (i.e. it is not in
2140 * the range (scn_min_txg, scn_max_txg] then it is not eligible
2143 if (vdev_dtl_max(vd
) <= scn
->scn_phys
.scn_max_txg
) {
2144 ASSERT3U(scn
->scn_phys
.scn_min_txg
, <=, vdev_dtl_min(vd
));
2145 ASSERT3U(scn
->scn_phys
.scn_min_txg
, <, vd
->vdev_resilver_txg
);
2146 ASSERT3U(vd
->vdev_resilver_txg
, <=, scn
->scn_phys
.scn_max_txg
);
2153 * Reassess DTLs after a config change or scrub completion.
2156 vdev_dtl_reassess(vdev_t
*vd
, uint64_t txg
, uint64_t scrub_txg
, int scrub_done
)
2158 spa_t
*spa
= vd
->vdev_spa
;
2162 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
2164 for (int c
= 0; c
< vd
->vdev_children
; c
++)
2165 vdev_dtl_reassess(vd
->vdev_child
[c
], txg
,
2166 scrub_txg
, scrub_done
);
2168 if (vd
== spa
->spa_root_vdev
|| !vdev_is_concrete(vd
) || vd
->vdev_aux
)
2171 if (vd
->vdev_ops
->vdev_op_leaf
) {
2172 dsl_scan_t
*scn
= spa
->spa_dsl_pool
->dp_scan
;
2174 mutex_enter(&vd
->vdev_dtl_lock
);
2177 * If we've completed a scan cleanly then determine
2178 * if this vdev should remove any DTLs. We only want to
2179 * excise regions on vdevs that were available during
2180 * the entire duration of this scan.
2182 if (scrub_txg
!= 0 &&
2183 (spa
->spa_scrub_started
||
2184 (scn
!= NULL
&& scn
->scn_phys
.scn_errors
== 0)) &&
2185 vdev_dtl_should_excise(vd
)) {
2187 * We completed a scrub up to scrub_txg. If we
2188 * did it without rebooting, then the scrub dtl
2189 * will be valid, so excise the old region and
2190 * fold in the scrub dtl. Otherwise, leave the
2191 * dtl as-is if there was an error.
2193 * There's little trick here: to excise the beginning
2194 * of the DTL_MISSING map, we put it into a reference
2195 * tree and then add a segment with refcnt -1 that
2196 * covers the range [0, scrub_txg). This means
2197 * that each txg in that range has refcnt -1 or 0.
2198 * We then add DTL_SCRUB with a refcnt of 2, so that
2199 * entries in the range [0, scrub_txg) will have a
2200 * positive refcnt -- either 1 or 2. We then convert
2201 * the reference tree into the new DTL_MISSING map.
2203 space_reftree_create(&reftree
);
2204 space_reftree_add_map(&reftree
,
2205 vd
->vdev_dtl
[DTL_MISSING
], 1);
2206 space_reftree_add_seg(&reftree
, 0, scrub_txg
, -1);
2207 space_reftree_add_map(&reftree
,
2208 vd
->vdev_dtl
[DTL_SCRUB
], 2);
2209 space_reftree_generate_map(&reftree
,
2210 vd
->vdev_dtl
[DTL_MISSING
], 1);
2211 space_reftree_destroy(&reftree
);
2213 range_tree_vacate(vd
->vdev_dtl
[DTL_PARTIAL
], NULL
, NULL
);
2214 range_tree_walk(vd
->vdev_dtl
[DTL_MISSING
],
2215 range_tree_add
, vd
->vdev_dtl
[DTL_PARTIAL
]);
2217 range_tree_vacate(vd
->vdev_dtl
[DTL_SCRUB
], NULL
, NULL
);
2218 range_tree_vacate(vd
->vdev_dtl
[DTL_OUTAGE
], NULL
, NULL
);
2219 if (!vdev_readable(vd
))
2220 range_tree_add(vd
->vdev_dtl
[DTL_OUTAGE
], 0, -1ULL);
2222 range_tree_walk(vd
->vdev_dtl
[DTL_MISSING
],
2223 range_tree_add
, vd
->vdev_dtl
[DTL_OUTAGE
]);
2226 * If the vdev was resilvering and no longer has any
2227 * DTLs then reset its resilvering flag.
2229 if (vd
->vdev_resilver_txg
!= 0 &&
2230 range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) == 0 &&
2231 range_tree_space(vd
->vdev_dtl
[DTL_OUTAGE
]) == 0)
2232 vd
->vdev_resilver_txg
= 0;
2234 mutex_exit(&vd
->vdev_dtl_lock
);
2237 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, txg
);
2241 mutex_enter(&vd
->vdev_dtl_lock
);
2242 for (int t
= 0; t
< DTL_TYPES
; t
++) {
2243 /* account for child's outage in parent's missing map */
2244 int s
= (t
== DTL_MISSING
) ? DTL_OUTAGE
: t
;
2246 continue; /* leaf vdevs only */
2247 if (t
== DTL_PARTIAL
)
2248 minref
= 1; /* i.e. non-zero */
2249 else if (vd
->vdev_nparity
!= 0)
2250 minref
= vd
->vdev_nparity
+ 1; /* RAID-Z */
2252 minref
= vd
->vdev_children
; /* any kind of mirror */
2253 space_reftree_create(&reftree
);
2254 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
2255 vdev_t
*cvd
= vd
->vdev_child
[c
];
2256 mutex_enter(&cvd
->vdev_dtl_lock
);
2257 space_reftree_add_map(&reftree
, cvd
->vdev_dtl
[s
], 1);
2258 mutex_exit(&cvd
->vdev_dtl_lock
);
2260 space_reftree_generate_map(&reftree
, vd
->vdev_dtl
[t
], minref
);
2261 space_reftree_destroy(&reftree
);
2263 mutex_exit(&vd
->vdev_dtl_lock
);
2267 vdev_dtl_load(vdev_t
*vd
)
2269 spa_t
*spa
= vd
->vdev_spa
;
2270 objset_t
*mos
= spa
->spa_meta_objset
;
2273 if (vd
->vdev_ops
->vdev_op_leaf
&& vd
->vdev_dtl_object
!= 0) {
2274 ASSERT(vdev_is_concrete(vd
));
2276 error
= space_map_open(&vd
->vdev_dtl_sm
, mos
,
2277 vd
->vdev_dtl_object
, 0, -1ULL, 0);
2280 ASSERT(vd
->vdev_dtl_sm
!= NULL
);
2282 mutex_enter(&vd
->vdev_dtl_lock
);
2285 * Now that we've opened the space_map we need to update
2288 space_map_update(vd
->vdev_dtl_sm
);
2290 error
= space_map_load(vd
->vdev_dtl_sm
,
2291 vd
->vdev_dtl
[DTL_MISSING
], SM_ALLOC
);
2292 mutex_exit(&vd
->vdev_dtl_lock
);
2297 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
2298 error
= vdev_dtl_load(vd
->vdev_child
[c
]);
2307 vdev_destroy_unlink_zap(vdev_t
*vd
, uint64_t zapobj
, dmu_tx_t
*tx
)
2309 spa_t
*spa
= vd
->vdev_spa
;
2311 VERIFY0(zap_destroy(spa
->spa_meta_objset
, zapobj
, tx
));
2312 VERIFY0(zap_remove_int(spa
->spa_meta_objset
, spa
->spa_all_vdev_zaps
,
2317 vdev_create_link_zap(vdev_t
*vd
, dmu_tx_t
*tx
)
2319 spa_t
*spa
= vd
->vdev_spa
;
2320 uint64_t zap
= zap_create(spa
->spa_meta_objset
, DMU_OTN_ZAP_METADATA
,
2321 DMU_OT_NONE
, 0, tx
);
2324 VERIFY0(zap_add_int(spa
->spa_meta_objset
, spa
->spa_all_vdev_zaps
,
2331 vdev_construct_zaps(vdev_t
*vd
, dmu_tx_t
*tx
)
2333 if (vd
->vdev_ops
!= &vdev_hole_ops
&&
2334 vd
->vdev_ops
!= &vdev_missing_ops
&&
2335 vd
->vdev_ops
!= &vdev_root_ops
&&
2336 !vd
->vdev_top
->vdev_removing
) {
2337 if (vd
->vdev_ops
->vdev_op_leaf
&& vd
->vdev_leaf_zap
== 0) {
2338 vd
->vdev_leaf_zap
= vdev_create_link_zap(vd
, tx
);
2340 if (vd
== vd
->vdev_top
&& vd
->vdev_top_zap
== 0) {
2341 vd
->vdev_top_zap
= vdev_create_link_zap(vd
, tx
);
2344 for (uint64_t i
= 0; i
< vd
->vdev_children
; i
++) {
2345 vdev_construct_zaps(vd
->vdev_child
[i
], tx
);
2350 vdev_dtl_sync(vdev_t
*vd
, uint64_t txg
)
2352 spa_t
*spa
= vd
->vdev_spa
;
2353 range_tree_t
*rt
= vd
->vdev_dtl
[DTL_MISSING
];
2354 objset_t
*mos
= spa
->spa_meta_objset
;
2355 range_tree_t
*rtsync
;
2357 uint64_t object
= space_map_object(vd
->vdev_dtl_sm
);
2359 ASSERT(vdev_is_concrete(vd
));
2360 ASSERT(vd
->vdev_ops
->vdev_op_leaf
);
2362 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2364 if (vd
->vdev_detached
|| vd
->vdev_top
->vdev_removing
) {
2365 mutex_enter(&vd
->vdev_dtl_lock
);
2366 space_map_free(vd
->vdev_dtl_sm
, tx
);
2367 space_map_close(vd
->vdev_dtl_sm
);
2368 vd
->vdev_dtl_sm
= NULL
;
2369 mutex_exit(&vd
->vdev_dtl_lock
);
2372 * We only destroy the leaf ZAP for detached leaves or for
2373 * removed log devices. Removed data devices handle leaf ZAP
2374 * cleanup later, once cancellation is no longer possible.
2376 if (vd
->vdev_leaf_zap
!= 0 && (vd
->vdev_detached
||
2377 vd
->vdev_top
->vdev_islog
)) {
2378 vdev_destroy_unlink_zap(vd
, vd
->vdev_leaf_zap
, tx
);
2379 vd
->vdev_leaf_zap
= 0;
2386 if (vd
->vdev_dtl_sm
== NULL
) {
2387 uint64_t new_object
;
2389 new_object
= space_map_alloc(mos
, tx
);
2390 VERIFY3U(new_object
, !=, 0);
2392 VERIFY0(space_map_open(&vd
->vdev_dtl_sm
, mos
, new_object
,
2394 ASSERT(vd
->vdev_dtl_sm
!= NULL
);
2397 rtsync
= range_tree_create(NULL
, NULL
);
2399 mutex_enter(&vd
->vdev_dtl_lock
);
2400 range_tree_walk(rt
, range_tree_add
, rtsync
);
2401 mutex_exit(&vd
->vdev_dtl_lock
);
2403 space_map_truncate(vd
->vdev_dtl_sm
, tx
);
2404 space_map_write(vd
->vdev_dtl_sm
, rtsync
, SM_ALLOC
, tx
);
2405 range_tree_vacate(rtsync
, NULL
, NULL
);
2407 range_tree_destroy(rtsync
);
2410 * If the object for the space map has changed then dirty
2411 * the top level so that we update the config.
2413 if (object
!= space_map_object(vd
->vdev_dtl_sm
)) {
2414 vdev_dbgmsg(vd
, "txg %llu, spa %s, DTL old object %llu, "
2415 "new object %llu", (u_longlong_t
)txg
, spa_name(spa
),
2416 (u_longlong_t
)object
,
2417 (u_longlong_t
)space_map_object(vd
->vdev_dtl_sm
));
2418 vdev_config_dirty(vd
->vdev_top
);
2423 mutex_enter(&vd
->vdev_dtl_lock
);
2424 space_map_update(vd
->vdev_dtl_sm
);
2425 mutex_exit(&vd
->vdev_dtl_lock
);
2429 * Determine whether the specified vdev can be offlined/detached/removed
2430 * without losing data.
2433 vdev_dtl_required(vdev_t
*vd
)
2435 spa_t
*spa
= vd
->vdev_spa
;
2436 vdev_t
*tvd
= vd
->vdev_top
;
2437 uint8_t cant_read
= vd
->vdev_cant_read
;
2440 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
2442 if (vd
== spa
->spa_root_vdev
|| vd
== tvd
)
2446 * Temporarily mark the device as unreadable, and then determine
2447 * whether this results in any DTL outages in the top-level vdev.
2448 * If not, we can safely offline/detach/remove the device.
2450 vd
->vdev_cant_read
= B_TRUE
;
2451 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
2452 required
= !vdev_dtl_empty(tvd
, DTL_OUTAGE
);
2453 vd
->vdev_cant_read
= cant_read
;
2454 vdev_dtl_reassess(tvd
, 0, 0, B_FALSE
);
2456 if (!required
&& zio_injection_enabled
)
2457 required
= !!zio_handle_device_injection(vd
, NULL
, ECHILD
);
2463 * Determine if resilver is needed, and if so the txg range.
2466 vdev_resilver_needed(vdev_t
*vd
, uint64_t *minp
, uint64_t *maxp
)
2468 boolean_t needed
= B_FALSE
;
2469 uint64_t thismin
= UINT64_MAX
;
2470 uint64_t thismax
= 0;
2472 if (vd
->vdev_children
== 0) {
2473 mutex_enter(&vd
->vdev_dtl_lock
);
2474 if (range_tree_space(vd
->vdev_dtl
[DTL_MISSING
]) != 0 &&
2475 vdev_writeable(vd
)) {
2477 thismin
= vdev_dtl_min(vd
);
2478 thismax
= vdev_dtl_max(vd
);
2481 mutex_exit(&vd
->vdev_dtl_lock
);
2483 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
2484 vdev_t
*cvd
= vd
->vdev_child
[c
];
2485 uint64_t cmin
, cmax
;
2487 if (vdev_resilver_needed(cvd
, &cmin
, &cmax
)) {
2488 thismin
= MIN(thismin
, cmin
);
2489 thismax
= MAX(thismax
, cmax
);
2495 if (needed
&& minp
) {
2503 vdev_load(vdev_t
*vd
)
2507 * Recursively load all children.
2509 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
2510 error
= vdev_load(vd
->vdev_child
[c
]);
2516 vdev_set_deflate_ratio(vd
);
2519 * If this is a top-level vdev, initialize its metaslabs.
2521 if (vd
== vd
->vdev_top
&& vdev_is_concrete(vd
)) {
2522 if (vd
->vdev_ashift
== 0 || vd
->vdev_asize
== 0) {
2523 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2524 VDEV_AUX_CORRUPT_DATA
);
2525 vdev_dbgmsg(vd
, "vdev_load: invalid size. ashift=%llu, "
2526 "asize=%llu", (u_longlong_t
)vd
->vdev_ashift
,
2527 (u_longlong_t
)vd
->vdev_asize
);
2528 return (SET_ERROR(ENXIO
));
2529 } else if ((error
= vdev_metaslab_init(vd
, 0)) != 0) {
2530 vdev_dbgmsg(vd
, "vdev_load: metaslab_init failed "
2531 "[error=%d]", error
);
2532 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2533 VDEV_AUX_CORRUPT_DATA
);
2539 * If this is a leaf vdev, load its DTL.
2541 if (vd
->vdev_ops
->vdev_op_leaf
&& (error
= vdev_dtl_load(vd
)) != 0) {
2542 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2543 VDEV_AUX_CORRUPT_DATA
);
2544 vdev_dbgmsg(vd
, "vdev_load: vdev_dtl_load failed "
2545 "[error=%d]", error
);
2549 uint64_t obsolete_sm_object
= vdev_obsolete_sm_object(vd
);
2550 if (obsolete_sm_object
!= 0) {
2551 objset_t
*mos
= vd
->vdev_spa
->spa_meta_objset
;
2552 ASSERT(vd
->vdev_asize
!= 0);
2553 ASSERT(vd
->vdev_obsolete_sm
== NULL
);
2555 if ((error
= space_map_open(&vd
->vdev_obsolete_sm
, mos
,
2556 obsolete_sm_object
, 0, vd
->vdev_asize
, 0))) {
2557 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
2558 VDEV_AUX_CORRUPT_DATA
);
2559 vdev_dbgmsg(vd
, "vdev_load: space_map_open failed for "
2560 "obsolete spacemap (obj %llu) [error=%d]",
2561 (u_longlong_t
)obsolete_sm_object
, error
);
2564 space_map_update(vd
->vdev_obsolete_sm
);
2571 * The special vdev case is used for hot spares and l2cache devices. Its
2572 * sole purpose it to set the vdev state for the associated vdev. To do this,
2573 * we make sure that we can open the underlying device, then try to read the
2574 * label, and make sure that the label is sane and that it hasn't been
2575 * repurposed to another pool.
2578 vdev_validate_aux(vdev_t
*vd
)
2581 uint64_t guid
, version
;
2584 if (!vdev_readable(vd
))
2587 if ((label
= vdev_label_read_config(vd
, -1ULL)) == NULL
) {
2588 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
2589 VDEV_AUX_CORRUPT_DATA
);
2593 if (nvlist_lookup_uint64(label
, ZPOOL_CONFIG_VERSION
, &version
) != 0 ||
2594 !SPA_VERSION_IS_SUPPORTED(version
) ||
2595 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_GUID
, &guid
) != 0 ||
2596 guid
!= vd
->vdev_guid
||
2597 nvlist_lookup_uint64(label
, ZPOOL_CONFIG_POOL_STATE
, &state
) != 0) {
2598 vdev_set_state(vd
, B_TRUE
, VDEV_STATE_CANT_OPEN
,
2599 VDEV_AUX_CORRUPT_DATA
);
2605 * We don't actually check the pool state here. If it's in fact in
2606 * use by another pool, we update this fact on the fly when requested.
2613 * Free the objects used to store this vdev's spacemaps, and the array
2614 * that points to them.
2617 vdev_destroy_spacemaps(vdev_t
*vd
, dmu_tx_t
*tx
)
2619 if (vd
->vdev_ms_array
== 0)
2622 objset_t
*mos
= vd
->vdev_spa
->spa_meta_objset
;
2623 uint64_t array_count
= vd
->vdev_asize
>> vd
->vdev_ms_shift
;
2624 size_t array_bytes
= array_count
* sizeof (uint64_t);
2625 uint64_t *smobj_array
= kmem_alloc(array_bytes
, KM_SLEEP
);
2626 VERIFY0(dmu_read(mos
, vd
->vdev_ms_array
, 0,
2627 array_bytes
, smobj_array
, 0));
2629 for (uint64_t i
= 0; i
< array_count
; i
++) {
2630 uint64_t smobj
= smobj_array
[i
];
2634 space_map_free_obj(mos
, smobj
, tx
);
2637 kmem_free(smobj_array
, array_bytes
);
2638 VERIFY0(dmu_object_free(mos
, vd
->vdev_ms_array
, tx
));
2639 vd
->vdev_ms_array
= 0;
2643 vdev_remove_empty(vdev_t
*vd
, uint64_t txg
)
2645 spa_t
*spa
= vd
->vdev_spa
;
2648 ASSERT(vd
== vd
->vdev_top
);
2649 ASSERT3U(txg
, ==, spa_syncing_txg(spa
));
2651 if (vd
->vdev_ms
!= NULL
) {
2652 metaslab_group_t
*mg
= vd
->vdev_mg
;
2654 metaslab_group_histogram_verify(mg
);
2655 metaslab_class_histogram_verify(mg
->mg_class
);
2657 for (int m
= 0; m
< vd
->vdev_ms_count
; m
++) {
2658 metaslab_t
*msp
= vd
->vdev_ms
[m
];
2660 if (msp
== NULL
|| msp
->ms_sm
== NULL
)
2663 mutex_enter(&msp
->ms_lock
);
2665 * If the metaslab was not loaded when the vdev
2666 * was removed then the histogram accounting may
2667 * not be accurate. Update the histogram information
2668 * here so that we ensure that the metaslab group
2669 * and metaslab class are up-to-date.
2671 metaslab_group_histogram_remove(mg
, msp
);
2673 VERIFY0(space_map_allocated(msp
->ms_sm
));
2674 space_map_close(msp
->ms_sm
);
2676 mutex_exit(&msp
->ms_lock
);
2679 metaslab_group_histogram_verify(mg
);
2680 metaslab_class_histogram_verify(mg
->mg_class
);
2681 for (int i
= 0; i
< RANGE_TREE_HISTOGRAM_SIZE
; i
++)
2682 ASSERT0(mg
->mg_histogram
[i
]);
2685 tx
= dmu_tx_create_assigned(spa_get_dsl(spa
), txg
);
2686 vdev_destroy_spacemaps(vd
, tx
);
2688 if (vd
->vdev_islog
&& vd
->vdev_top_zap
!= 0) {
2689 vdev_destroy_unlink_zap(vd
, vd
->vdev_top_zap
, tx
);
2690 vd
->vdev_top_zap
= 0;
2696 vdev_sync_done(vdev_t
*vd
, uint64_t txg
)
2699 boolean_t reassess
= !txg_list_empty(&vd
->vdev_ms_list
, TXG_CLEAN(txg
));
2701 ASSERT(vdev_is_concrete(vd
));
2703 while (msp
= txg_list_remove(&vd
->vdev_ms_list
, TXG_CLEAN(txg
)))
2704 metaslab_sync_done(msp
, txg
);
2707 metaslab_sync_reassess(vd
->vdev_mg
);
2711 vdev_sync(vdev_t
*vd
, uint64_t txg
)
2713 spa_t
*spa
= vd
->vdev_spa
;
2718 if (range_tree_space(vd
->vdev_obsolete_segments
) > 0) {
2721 ASSERT(vd
->vdev_removing
||
2722 vd
->vdev_ops
== &vdev_indirect_ops
);
2724 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2725 vdev_indirect_sync_obsolete(vd
, tx
);
2729 * If the vdev is indirect, it can't have dirty
2730 * metaslabs or DTLs.
2732 if (vd
->vdev_ops
== &vdev_indirect_ops
) {
2733 ASSERT(txg_list_empty(&vd
->vdev_ms_list
, txg
));
2734 ASSERT(txg_list_empty(&vd
->vdev_dtl_list
, txg
));
2739 ASSERT(vdev_is_concrete(vd
));
2741 if (vd
->vdev_ms_array
== 0 && vd
->vdev_ms_shift
!= 0 &&
2742 !vd
->vdev_removing
) {
2743 ASSERT(vd
== vd
->vdev_top
);
2744 ASSERT0(vd
->vdev_indirect_config
.vic_mapping_object
);
2745 tx
= dmu_tx_create_assigned(spa
->spa_dsl_pool
, txg
);
2746 vd
->vdev_ms_array
= dmu_object_alloc(spa
->spa_meta_objset
,
2747 DMU_OT_OBJECT_ARRAY
, 0, DMU_OT_NONE
, 0, tx
);
2748 ASSERT(vd
->vdev_ms_array
!= 0);
2749 vdev_config_dirty(vd
);
2753 while ((msp
= txg_list_remove(&vd
->vdev_ms_list
, txg
)) != NULL
) {
2754 metaslab_sync(msp
, txg
);
2755 (void) txg_list_add(&vd
->vdev_ms_list
, msp
, TXG_CLEAN(txg
));
2758 while ((lvd
= txg_list_remove(&vd
->vdev_dtl_list
, txg
)) != NULL
)
2759 vdev_dtl_sync(lvd
, txg
);
2762 * Remove the metadata associated with this vdev once it's empty.
2763 * Note that this is typically used for log/cache device removal;
2764 * we don't empty toplevel vdevs when removing them. But if
2765 * a toplevel happens to be emptied, this is not harmful.
2767 if (vd
->vdev_stat
.vs_alloc
== 0 && vd
->vdev_removing
) {
2768 vdev_remove_empty(vd
, txg
);
2771 (void) txg_list_add(&spa
->spa_vdev_txg_list
, vd
, TXG_CLEAN(txg
));
2775 vdev_psize_to_asize(vdev_t
*vd
, uint64_t psize
)
2777 return (vd
->vdev_ops
->vdev_op_asize(vd
, psize
));
2781 * Mark the given vdev faulted. A faulted vdev behaves as if the device could
2782 * not be opened, and no I/O is attempted.
2785 vdev_fault(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2789 spa_vdev_state_enter(spa
, SCL_NONE
);
2791 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2792 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2794 if (!vd
->vdev_ops
->vdev_op_leaf
)
2795 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2800 * We don't directly use the aux state here, but if we do a
2801 * vdev_reopen(), we need this value to be present to remember why we
2804 vd
->vdev_label_aux
= aux
;
2807 * Faulted state takes precedence over degraded.
2809 vd
->vdev_delayed_close
= B_FALSE
;
2810 vd
->vdev_faulted
= 1ULL;
2811 vd
->vdev_degraded
= 0ULL;
2812 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_FAULTED
, aux
);
2815 * If this device has the only valid copy of the data, then
2816 * back off and simply mark the vdev as degraded instead.
2818 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&& vdev_dtl_required(vd
)) {
2819 vd
->vdev_degraded
= 1ULL;
2820 vd
->vdev_faulted
= 0ULL;
2823 * If we reopen the device and it's not dead, only then do we
2828 if (vdev_readable(vd
))
2829 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
, aux
);
2832 return (spa_vdev_state_exit(spa
, vd
, 0));
2836 * Mark the given vdev degraded. A degraded vdev is purely an indication to the
2837 * user that something is wrong. The vdev continues to operate as normal as far
2838 * as I/O is concerned.
2841 vdev_degrade(spa_t
*spa
, uint64_t guid
, vdev_aux_t aux
)
2845 spa_vdev_state_enter(spa
, SCL_NONE
);
2847 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2848 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2850 if (!vd
->vdev_ops
->vdev_op_leaf
)
2851 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2854 * If the vdev is already faulted, then don't do anything.
2856 if (vd
->vdev_faulted
|| vd
->vdev_degraded
)
2857 return (spa_vdev_state_exit(spa
, NULL
, 0));
2859 vd
->vdev_degraded
= 1ULL;
2860 if (!vdev_is_dead(vd
))
2861 vdev_set_state(vd
, B_FALSE
, VDEV_STATE_DEGRADED
,
2864 return (spa_vdev_state_exit(spa
, vd
, 0));
2868 * Online the given vdev.
2870 * If 'ZFS_ONLINE_UNSPARE' is set, it implies two things. First, any attached
2871 * spare device should be detached when the device finishes resilvering.
2872 * Second, the online should be treated like a 'test' online case, so no FMA
2873 * events are generated if the device fails to open.
2876 vdev_online(spa_t
*spa
, uint64_t guid
, uint64_t flags
, vdev_state_t
*newstate
)
2878 vdev_t
*vd
, *tvd
, *pvd
, *rvd
= spa
->spa_root_vdev
;
2879 boolean_t wasoffline
;
2880 vdev_state_t oldstate
;
2882 spa_vdev_state_enter(spa
, SCL_NONE
);
2884 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2885 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2887 if (!vd
->vdev_ops
->vdev_op_leaf
)
2888 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2890 wasoffline
= (vd
->vdev_offline
|| vd
->vdev_tmpoffline
);
2891 oldstate
= vd
->vdev_state
;
2894 vd
->vdev_offline
= B_FALSE
;
2895 vd
->vdev_tmpoffline
= B_FALSE
;
2896 vd
->vdev_checkremove
= !!(flags
& ZFS_ONLINE_CHECKREMOVE
);
2897 vd
->vdev_forcefault
= !!(flags
& ZFS_ONLINE_FORCEFAULT
);
2899 /* XXX - L2ARC 1.0 does not support expansion */
2900 if (!vd
->vdev_aux
) {
2901 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2902 pvd
->vdev_expanding
= !!(flags
& ZFS_ONLINE_EXPAND
);
2906 vd
->vdev_checkremove
= vd
->vdev_forcefault
= B_FALSE
;
2908 if (!vd
->vdev_aux
) {
2909 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
2910 pvd
->vdev_expanding
= B_FALSE
;
2914 *newstate
= vd
->vdev_state
;
2915 if ((flags
& ZFS_ONLINE_UNSPARE
) &&
2916 !vdev_is_dead(vd
) && vd
->vdev_parent
&&
2917 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
2918 vd
->vdev_parent
->vdev_child
[0] == vd
)
2919 vd
->vdev_unspare
= B_TRUE
;
2921 if ((flags
& ZFS_ONLINE_EXPAND
) || spa
->spa_autoexpand
) {
2923 /* XXX - L2ARC 1.0 does not support expansion */
2925 return (spa_vdev_state_exit(spa
, vd
, ENOTSUP
));
2926 spa_async_request(spa
, SPA_ASYNC_CONFIG_UPDATE
);
2930 (oldstate
< VDEV_STATE_DEGRADED
&&
2931 vd
->vdev_state
>= VDEV_STATE_DEGRADED
))
2932 spa_event_notify(spa
, vd
, NULL
, ESC_ZFS_VDEV_ONLINE
);
2934 return (spa_vdev_state_exit(spa
, vd
, 0));
2938 vdev_offline_locked(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
2942 uint64_t generation
;
2943 metaslab_group_t
*mg
;
2946 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2948 if ((vd
= spa_lookup_by_guid(spa
, guid
, B_TRUE
)) == NULL
)
2949 return (spa_vdev_state_exit(spa
, NULL
, ENODEV
));
2951 if (!vd
->vdev_ops
->vdev_op_leaf
)
2952 return (spa_vdev_state_exit(spa
, NULL
, ENOTSUP
));
2956 generation
= spa
->spa_config_generation
+ 1;
2959 * If the device isn't already offline, try to offline it.
2961 if (!vd
->vdev_offline
) {
2963 * If this device has the only valid copy of some data,
2964 * don't allow it to be offlined. Log devices are always
2967 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
2968 vdev_dtl_required(vd
))
2969 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
2972 * If the top-level is a slog and it has had allocations
2973 * then proceed. We check that the vdev's metaslab group
2974 * is not NULL since it's possible that we may have just
2975 * added this vdev but not yet initialized its metaslabs.
2977 if (tvd
->vdev_islog
&& mg
!= NULL
) {
2979 * Prevent any future allocations.
2981 metaslab_group_passivate(mg
);
2982 (void) spa_vdev_state_exit(spa
, vd
, 0);
2984 error
= spa_reset_logs(spa
);
2986 spa_vdev_state_enter(spa
, SCL_ALLOC
);
2989 * Check to see if the config has changed.
2991 if (error
|| generation
!= spa
->spa_config_generation
) {
2992 metaslab_group_activate(mg
);
2994 return (spa_vdev_state_exit(spa
,
2996 (void) spa_vdev_state_exit(spa
, vd
, 0);
2999 ASSERT0(tvd
->vdev_stat
.vs_alloc
);
3003 * Offline this device and reopen its top-level vdev.
3004 * If the top-level vdev is a log device then just offline
3005 * it. Otherwise, if this action results in the top-level
3006 * vdev becoming unusable, undo it and fail the request.
3008 vd
->vdev_offline
= B_TRUE
;
3011 if (!tvd
->vdev_islog
&& vd
->vdev_aux
== NULL
&&
3012 vdev_is_dead(tvd
)) {
3013 vd
->vdev_offline
= B_FALSE
;
3015 return (spa_vdev_state_exit(spa
, NULL
, EBUSY
));
3019 * Add the device back into the metaslab rotor so that
3020 * once we online the device it's open for business.
3022 if (tvd
->vdev_islog
&& mg
!= NULL
)
3023 metaslab_group_activate(mg
);
3026 vd
->vdev_tmpoffline
= !!(flags
& ZFS_OFFLINE_TEMPORARY
);
3028 return (spa_vdev_state_exit(spa
, vd
, 0));
3032 vdev_offline(spa_t
*spa
, uint64_t guid
, uint64_t flags
)
3036 mutex_enter(&spa
->spa_vdev_top_lock
);
3037 error
= vdev_offline_locked(spa
, guid
, flags
);
3038 mutex_exit(&spa
->spa_vdev_top_lock
);
3044 * Clear the error counts associated with this vdev. Unlike vdev_online() and
3045 * vdev_offline(), we assume the spa config is locked. We also clear all
3046 * children. If 'vd' is NULL, then the user wants to clear all vdevs.
3049 vdev_clear(spa_t
*spa
, vdev_t
*vd
)
3051 vdev_t
*rvd
= spa
->spa_root_vdev
;
3053 ASSERT(spa_config_held(spa
, SCL_STATE_ALL
, RW_WRITER
) == SCL_STATE_ALL
);
3058 vd
->vdev_stat
.vs_read_errors
= 0;
3059 vd
->vdev_stat
.vs_write_errors
= 0;
3060 vd
->vdev_stat
.vs_checksum_errors
= 0;
3062 for (int c
= 0; c
< vd
->vdev_children
; c
++)
3063 vdev_clear(spa
, vd
->vdev_child
[c
]);
3066 * It makes no sense to "clear" an indirect vdev.
3068 if (!vdev_is_concrete(vd
))
3072 * If we're in the FAULTED state or have experienced failed I/O, then
3073 * clear the persistent state and attempt to reopen the device. We
3074 * also mark the vdev config dirty, so that the new faulted state is
3075 * written out to disk.
3077 if (vd
->vdev_faulted
|| vd
->vdev_degraded
||
3078 !vdev_readable(vd
) || !vdev_writeable(vd
)) {
3081 * When reopening in reponse to a clear event, it may be due to
3082 * a fmadm repair request. In this case, if the device is
3083 * still broken, we want to still post the ereport again.
3085 vd
->vdev_forcefault
= B_TRUE
;
3087 vd
->vdev_faulted
= vd
->vdev_degraded
= 0ULL;
3088 vd
->vdev_cant_read
= B_FALSE
;
3089 vd
->vdev_cant_write
= B_FALSE
;
3091 vdev_reopen(vd
== rvd
? rvd
: vd
->vdev_top
);
3093 vd
->vdev_forcefault
= B_FALSE
;
3095 if (vd
!= rvd
&& vdev_writeable(vd
->vdev_top
))
3096 vdev_state_dirty(vd
->vdev_top
);
3098 if (vd
->vdev_aux
== NULL
&& !vdev_is_dead(vd
))
3099 spa_async_request(spa
, SPA_ASYNC_RESILVER
);
3101 spa_event_notify(spa
, vd
, NULL
, ESC_ZFS_VDEV_CLEAR
);
3105 * When clearing a FMA-diagnosed fault, we always want to
3106 * unspare the device, as we assume that the original spare was
3107 * done in response to the FMA fault.
3109 if (!vdev_is_dead(vd
) && vd
->vdev_parent
!= NULL
&&
3110 vd
->vdev_parent
->vdev_ops
== &vdev_spare_ops
&&
3111 vd
->vdev_parent
->vdev_child
[0] == vd
)
3112 vd
->vdev_unspare
= B_TRUE
;
3116 vdev_is_dead(vdev_t
*vd
)
3119 * Holes and missing devices are always considered "dead".
3120 * This simplifies the code since we don't have to check for
3121 * these types of devices in the various code paths.
3122 * Instead we rely on the fact that we skip over dead devices
3123 * before issuing I/O to them.
3125 return (vd
->vdev_state
< VDEV_STATE_DEGRADED
||
3126 vd
->vdev_ops
== &vdev_hole_ops
||
3127 vd
->vdev_ops
== &vdev_missing_ops
);
3131 vdev_readable(vdev_t
*vd
)
3133 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_read
);
3137 vdev_writeable(vdev_t
*vd
)
3139 return (!vdev_is_dead(vd
) && !vd
->vdev_cant_write
&&
3140 vdev_is_concrete(vd
));
3144 vdev_allocatable(vdev_t
*vd
)
3146 uint64_t state
= vd
->vdev_state
;
3149 * We currently allow allocations from vdevs which may be in the
3150 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device
3151 * fails to reopen then we'll catch it later when we're holding
3152 * the proper locks. Note that we have to get the vdev state
3153 * in a local variable because although it changes atomically,
3154 * we're asking two separate questions about it.
3156 return (!(state
< VDEV_STATE_DEGRADED
&& state
!= VDEV_STATE_CLOSED
) &&
3157 !vd
->vdev_cant_write
&& vdev_is_concrete(vd
) &&
3158 vd
->vdev_mg
->mg_initialized
);
3162 vdev_accessible(vdev_t
*vd
, zio_t
*zio
)
3164 ASSERT(zio
->io_vd
== vd
);
3166 if (vdev_is_dead(vd
) || vd
->vdev_remove_wanted
)
3169 if (zio
->io_type
== ZIO_TYPE_READ
)
3170 return (!vd
->vdev_cant_read
);
3172 if (zio
->io_type
== ZIO_TYPE_WRITE
)
3173 return (!vd
->vdev_cant_write
);
3179 * Get statistics for the given vdev.
3182 vdev_get_stats(vdev_t
*vd
, vdev_stat_t
*vs
)
3184 spa_t
*spa
= vd
->vdev_spa
;
3185 vdev_t
*rvd
= spa
->spa_root_vdev
;
3186 vdev_t
*tvd
= vd
->vdev_top
;
3188 ASSERT(spa_config_held(spa
, SCL_ALL
, RW_READER
) != 0);
3190 mutex_enter(&vd
->vdev_stat_lock
);
3191 bcopy(&vd
->vdev_stat
, vs
, sizeof (*vs
));
3192 vs
->vs_timestamp
= gethrtime() - vs
->vs_timestamp
;
3193 vs
->vs_state
= vd
->vdev_state
;
3194 vs
->vs_rsize
= vdev_get_min_asize(vd
);
3195 if (vd
->vdev_ops
->vdev_op_leaf
)
3196 vs
->vs_rsize
+= VDEV_LABEL_START_SIZE
+ VDEV_LABEL_END_SIZE
;
3198 * Report expandable space on top-level, non-auxillary devices only.
3199 * The expandable space is reported in terms of metaslab sized units
3200 * since that determines how much space the pool can expand.
3202 if (vd
->vdev_aux
== NULL
&& tvd
!= NULL
) {
3203 vs
->vs_esize
= P2ALIGN(vd
->vdev_max_asize
- vd
->vdev_asize
-
3204 spa
->spa_bootsize
, 1ULL << tvd
->vdev_ms_shift
);
3206 if (vd
->vdev_aux
== NULL
&& vd
== vd
->vdev_top
&&
3207 vdev_is_concrete(vd
)) {
3208 vs
->vs_fragmentation
= vd
->vdev_mg
->mg_fragmentation
;
3212 * If we're getting stats on the root vdev, aggregate the I/O counts
3213 * over all top-level vdevs (i.e. the direct children of the root).
3216 for (int c
= 0; c
< rvd
->vdev_children
; c
++) {
3217 vdev_t
*cvd
= rvd
->vdev_child
[c
];
3218 vdev_stat_t
*cvs
= &cvd
->vdev_stat
;
3220 for (int t
= 0; t
< ZIO_TYPES
; t
++) {
3221 vs
->vs_ops
[t
] += cvs
->vs_ops
[t
];
3222 vs
->vs_bytes
[t
] += cvs
->vs_bytes
[t
];
3224 cvs
->vs_scan_removing
= cvd
->vdev_removing
;
3227 mutex_exit(&vd
->vdev_stat_lock
);
3231 vdev_clear_stats(vdev_t
*vd
)
3233 mutex_enter(&vd
->vdev_stat_lock
);
3234 vd
->vdev_stat
.vs_space
= 0;
3235 vd
->vdev_stat
.vs_dspace
= 0;
3236 vd
->vdev_stat
.vs_alloc
= 0;
3237 mutex_exit(&vd
->vdev_stat_lock
);
3241 vdev_scan_stat_init(vdev_t
*vd
)
3243 vdev_stat_t
*vs
= &vd
->vdev_stat
;
3245 for (int c
= 0; c
< vd
->vdev_children
; c
++)
3246 vdev_scan_stat_init(vd
->vdev_child
[c
]);
3248 mutex_enter(&vd
->vdev_stat_lock
);
3249 vs
->vs_scan_processed
= 0;
3250 mutex_exit(&vd
->vdev_stat_lock
);
3254 vdev_stat_update(zio_t
*zio
, uint64_t psize
)
3256 spa_t
*spa
= zio
->io_spa
;
3257 vdev_t
*rvd
= spa
->spa_root_vdev
;
3258 vdev_t
*vd
= zio
->io_vd
? zio
->io_vd
: rvd
;
3260 uint64_t txg
= zio
->io_txg
;
3261 vdev_stat_t
*vs
= &vd
->vdev_stat
;
3262 zio_type_t type
= zio
->io_type
;
3263 int flags
= zio
->io_flags
;
3266 * If this i/o is a gang leader, it didn't do any actual work.
3268 if (zio
->io_gang_tree
)
3271 if (zio
->io_error
== 0) {
3273 * If this is a root i/o, don't count it -- we've already
3274 * counted the top-level vdevs, and vdev_get_stats() will
3275 * aggregate them when asked. This reduces contention on
3276 * the root vdev_stat_lock and implicitly handles blocks
3277 * that compress away to holes, for which there is no i/o.
3278 * (Holes never create vdev children, so all the counters
3279 * remain zero, which is what we want.)
3281 * Note: this only applies to successful i/o (io_error == 0)
3282 * because unlike i/o counts, errors are not additive.
3283 * When reading a ditto block, for example, failure of
3284 * one top-level vdev does not imply a root-level error.
3289 ASSERT(vd
== zio
->io_vd
);
3291 if (flags
& ZIO_FLAG_IO_BYPASS
)
3294 mutex_enter(&vd
->vdev_stat_lock
);
3296 if (flags
& ZIO_FLAG_IO_REPAIR
) {
3297 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
3298 dsl_scan_phys_t
*scn_phys
=
3299 &spa
->spa_dsl_pool
->dp_scan
->scn_phys
;
3300 uint64_t *processed
= &scn_phys
->scn_processed
;
3303 if (vd
->vdev_ops
->vdev_op_leaf
)
3304 atomic_add_64(processed
, psize
);
3305 vs
->vs_scan_processed
+= psize
;
3308 if (flags
& ZIO_FLAG_SELF_HEAL
)
3309 vs
->vs_self_healed
+= psize
;
3313 vs
->vs_bytes
[type
] += psize
;
3315 mutex_exit(&vd
->vdev_stat_lock
);
3319 if (flags
& ZIO_FLAG_SPECULATIVE
)
3323 * If this is an I/O error that is going to be retried, then ignore the
3324 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as
3325 * hard errors, when in reality they can happen for any number of
3326 * innocuous reasons (bus resets, MPxIO link failure, etc).
3328 if (zio
->io_error
== EIO
&&
3329 !(zio
->io_flags
& ZIO_FLAG_IO_RETRY
))
3333 * Intent logs writes won't propagate their error to the root
3334 * I/O so don't mark these types of failures as pool-level
3337 if (zio
->io_vd
== NULL
&& (zio
->io_flags
& ZIO_FLAG_DONT_PROPAGATE
))
3340 mutex_enter(&vd
->vdev_stat_lock
);
3341 if (type
== ZIO_TYPE_READ
&& !vdev_is_dead(vd
)) {
3342 if (zio
->io_error
== ECKSUM
)
3343 vs
->vs_checksum_errors
++;
3345 vs
->vs_read_errors
++;
3347 if (type
== ZIO_TYPE_WRITE
&& !vdev_is_dead(vd
))
3348 vs
->vs_write_errors
++;
3349 mutex_exit(&vd
->vdev_stat_lock
);
3351 if (spa
->spa_load_state
== SPA_LOAD_NONE
&&
3352 type
== ZIO_TYPE_WRITE
&& txg
!= 0 &&
3353 (!(flags
& ZIO_FLAG_IO_REPAIR
) ||
3354 (flags
& ZIO_FLAG_SCAN_THREAD
) ||
3355 spa
->spa_claiming
)) {
3357 * This is either a normal write (not a repair), or it's
3358 * a repair induced by the scrub thread, or it's a repair
3359 * made by zil_claim() during spa_load() in the first txg.
3360 * In the normal case, we commit the DTL change in the same
3361 * txg as the block was born. In the scrub-induced repair
3362 * case, we know that scrubs run in first-pass syncing context,
3363 * so we commit the DTL change in spa_syncing_txg(spa).
3364 * In the zil_claim() case, we commit in spa_first_txg(spa).
3366 * We currently do not make DTL entries for failed spontaneous
3367 * self-healing writes triggered by normal (non-scrubbing)
3368 * reads, because we have no transactional context in which to
3369 * do so -- and it's not clear that it'd be desirable anyway.
3371 if (vd
->vdev_ops
->vdev_op_leaf
) {
3372 uint64_t commit_txg
= txg
;
3373 if (flags
& ZIO_FLAG_SCAN_THREAD
) {
3374 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
3375 ASSERT(spa_sync_pass(spa
) == 1);
3376 vdev_dtl_dirty(vd
, DTL_SCRUB
, txg
, 1);
3377 commit_txg
= spa_syncing_txg(spa
);
3378 } else if (spa
->spa_claiming
) {
3379 ASSERT(flags
& ZIO_FLAG_IO_REPAIR
);
3380 commit_txg
= spa_first_txg(spa
);
3382 ASSERT(commit_txg
>= spa_syncing_txg(spa
));
3383 if (vdev_dtl_contains(vd
, DTL_MISSING
, txg
, 1))
3385 for (pvd
= vd
; pvd
!= rvd
; pvd
= pvd
->vdev_parent
)
3386 vdev_dtl_dirty(pvd
, DTL_PARTIAL
, txg
, 1);
3387 vdev_dirty(vd
->vdev_top
, VDD_DTL
, vd
, commit_txg
);
3390 vdev_dtl_dirty(vd
, DTL_MISSING
, txg
, 1);
3395 * Update the in-core space usage stats for this vdev, its metaslab class,
3396 * and the root vdev.
3399 vdev_space_update(vdev_t
*vd
, int64_t alloc_delta
, int64_t defer_delta
,
3400 int64_t space_delta
)
3402 int64_t dspace_delta
= space_delta
;
3403 spa_t
*spa
= vd
->vdev_spa
;
3404 vdev_t
*rvd
= spa
->spa_root_vdev
;
3405 metaslab_group_t
*mg
= vd
->vdev_mg
;
3406 metaslab_class_t
*mc
= mg
? mg
->mg_class
: NULL
;
3408 ASSERT(vd
== vd
->vdev_top
);
3411 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion
3412 * factor. We must calculate this here and not at the root vdev
3413 * because the root vdev's psize-to-asize is simply the max of its
3414 * childrens', thus not accurate enough for us.
3416 ASSERT((dspace_delta
& (SPA_MINBLOCKSIZE
-1)) == 0);
3417 ASSERT(vd
->vdev_deflate_ratio
!= 0 || vd
->vdev_isl2cache
);
3418 dspace_delta
= (dspace_delta
>> SPA_MINBLOCKSHIFT
) *
3419 vd
->vdev_deflate_ratio
;
3421 mutex_enter(&vd
->vdev_stat_lock
);
3422 vd
->vdev_stat
.vs_alloc
+= alloc_delta
;
3423 vd
->vdev_stat
.vs_space
+= space_delta
;
3424 vd
->vdev_stat
.vs_dspace
+= dspace_delta
;
3425 mutex_exit(&vd
->vdev_stat_lock
);
3427 if (mc
== spa_normal_class(spa
)) {
3428 mutex_enter(&rvd
->vdev_stat_lock
);
3429 rvd
->vdev_stat
.vs_alloc
+= alloc_delta
;
3430 rvd
->vdev_stat
.vs_space
+= space_delta
;
3431 rvd
->vdev_stat
.vs_dspace
+= dspace_delta
;
3432 mutex_exit(&rvd
->vdev_stat_lock
);
3436 ASSERT(rvd
== vd
->vdev_parent
);
3437 ASSERT(vd
->vdev_ms_count
!= 0);
3439 metaslab_class_space_update(mc
,
3440 alloc_delta
, defer_delta
, space_delta
, dspace_delta
);
3445 * Mark a top-level vdev's config as dirty, placing it on the dirty list
3446 * so that it will be written out next time the vdev configuration is synced.
3447 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs.
3450 vdev_config_dirty(vdev_t
*vd
)
3452 spa_t
*spa
= vd
->vdev_spa
;
3453 vdev_t
*rvd
= spa
->spa_root_vdev
;
3456 ASSERT(spa_writeable(spa
));
3459 * If this is an aux vdev (as with l2cache and spare devices), then we
3460 * update the vdev config manually and set the sync flag.
3462 if (vd
->vdev_aux
!= NULL
) {
3463 spa_aux_vdev_t
*sav
= vd
->vdev_aux
;
3467 for (c
= 0; c
< sav
->sav_count
; c
++) {
3468 if (sav
->sav_vdevs
[c
] == vd
)
3472 if (c
== sav
->sav_count
) {
3474 * We're being removed. There's nothing more to do.
3476 ASSERT(sav
->sav_sync
== B_TRUE
);
3480 sav
->sav_sync
= B_TRUE
;
3482 if (nvlist_lookup_nvlist_array(sav
->sav_config
,
3483 ZPOOL_CONFIG_L2CACHE
, &aux
, &naux
) != 0) {
3484 VERIFY(nvlist_lookup_nvlist_array(sav
->sav_config
,
3485 ZPOOL_CONFIG_SPARES
, &aux
, &naux
) == 0);
3491 * Setting the nvlist in the middle if the array is a little
3492 * sketchy, but it will work.
3494 nvlist_free(aux
[c
]);
3495 aux
[c
] = vdev_config_generate(spa
, vd
, B_TRUE
, 0);
3501 * The dirty list is protected by the SCL_CONFIG lock. The caller
3502 * must either hold SCL_CONFIG as writer, or must be the sync thread
3503 * (which holds SCL_CONFIG as reader). There's only one sync thread,
3504 * so this is sufficient to ensure mutual exclusion.
3506 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
3507 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3508 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
3511 for (c
= 0; c
< rvd
->vdev_children
; c
++)
3512 vdev_config_dirty(rvd
->vdev_child
[c
]);
3514 ASSERT(vd
== vd
->vdev_top
);
3516 if (!list_link_active(&vd
->vdev_config_dirty_node
) &&
3517 vdev_is_concrete(vd
)) {
3518 list_insert_head(&spa
->spa_config_dirty_list
, vd
);
3524 vdev_config_clean(vdev_t
*vd
)
3526 spa_t
*spa
= vd
->vdev_spa
;
3528 ASSERT(spa_config_held(spa
, SCL_CONFIG
, RW_WRITER
) ||
3529 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3530 spa_config_held(spa
, SCL_CONFIG
, RW_READER
)));
3532 ASSERT(list_link_active(&vd
->vdev_config_dirty_node
));
3533 list_remove(&spa
->spa_config_dirty_list
, vd
);
3537 * Mark a top-level vdev's state as dirty, so that the next pass of
3538 * spa_sync() can convert this into vdev_config_dirty(). We distinguish
3539 * the state changes from larger config changes because they require
3540 * much less locking, and are often needed for administrative actions.
3543 vdev_state_dirty(vdev_t
*vd
)
3545 spa_t
*spa
= vd
->vdev_spa
;
3547 ASSERT(spa_writeable(spa
));
3548 ASSERT(vd
== vd
->vdev_top
);
3551 * The state list is protected by the SCL_STATE lock. The caller
3552 * must either hold SCL_STATE as writer, or must be the sync thread
3553 * (which holds SCL_STATE as reader). There's only one sync thread,
3554 * so this is sufficient to ensure mutual exclusion.
3556 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
3557 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3558 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
3560 if (!list_link_active(&vd
->vdev_state_dirty_node
) &&
3561 vdev_is_concrete(vd
))
3562 list_insert_head(&spa
->spa_state_dirty_list
, vd
);
3566 vdev_state_clean(vdev_t
*vd
)
3568 spa_t
*spa
= vd
->vdev_spa
;
3570 ASSERT(spa_config_held(spa
, SCL_STATE
, RW_WRITER
) ||
3571 (dsl_pool_sync_context(spa_get_dsl(spa
)) &&
3572 spa_config_held(spa
, SCL_STATE
, RW_READER
)));
3574 ASSERT(list_link_active(&vd
->vdev_state_dirty_node
));
3575 list_remove(&spa
->spa_state_dirty_list
, vd
);
3579 * Propagate vdev state up from children to parent.
3582 vdev_propagate_state(vdev_t
*vd
)
3584 spa_t
*spa
= vd
->vdev_spa
;
3585 vdev_t
*rvd
= spa
->spa_root_vdev
;
3586 int degraded
= 0, faulted
= 0;
3590 if (vd
->vdev_children
> 0) {
3591 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
3592 child
= vd
->vdev_child
[c
];
3595 * Don't factor holes or indirect vdevs into the
3598 if (!vdev_is_concrete(child
))
3601 if (!vdev_readable(child
) ||
3602 (!vdev_writeable(child
) && spa_writeable(spa
))) {
3604 * Root special: if there is a top-level log
3605 * device, treat the root vdev as if it were
3608 if (child
->vdev_islog
&& vd
== rvd
)
3612 } else if (child
->vdev_state
<= VDEV_STATE_DEGRADED
) {
3616 if (child
->vdev_stat
.vs_aux
== VDEV_AUX_CORRUPT_DATA
)
3620 vd
->vdev_ops
->vdev_op_state_change(vd
, faulted
, degraded
);
3623 * Root special: if there is a top-level vdev that cannot be
3624 * opened due to corrupted metadata, then propagate the root
3625 * vdev's aux state as 'corrupt' rather than 'insufficient
3628 if (corrupted
&& vd
== rvd
&&
3629 rvd
->vdev_state
== VDEV_STATE_CANT_OPEN
)
3630 vdev_set_state(rvd
, B_FALSE
, VDEV_STATE_CANT_OPEN
,
3631 VDEV_AUX_CORRUPT_DATA
);
3634 if (vd
->vdev_parent
)
3635 vdev_propagate_state(vd
->vdev_parent
);
3639 * Set a vdev's state. If this is during an open, we don't update the parent
3640 * state, because we're in the process of opening children depth-first.
3641 * Otherwise, we propagate the change to the parent.
3643 * If this routine places a device in a faulted state, an appropriate ereport is
3647 vdev_set_state(vdev_t
*vd
, boolean_t isopen
, vdev_state_t state
, vdev_aux_t aux
)
3649 uint64_t save_state
;
3650 spa_t
*spa
= vd
->vdev_spa
;
3652 if (state
== vd
->vdev_state
) {
3653 vd
->vdev_stat
.vs_aux
= aux
;
3657 save_state
= vd
->vdev_state
;
3659 vd
->vdev_state
= state
;
3660 vd
->vdev_stat
.vs_aux
= aux
;
3663 * If we are setting the vdev state to anything but an open state, then
3664 * always close the underlying device unless the device has requested
3665 * a delayed close (i.e. we're about to remove or fault the device).
3666 * Otherwise, we keep accessible but invalid devices open forever.
3667 * We don't call vdev_close() itself, because that implies some extra
3668 * checks (offline, etc) that we don't want here. This is limited to
3669 * leaf devices, because otherwise closing the device will affect other
3672 if (!vd
->vdev_delayed_close
&& vdev_is_dead(vd
) &&
3673 vd
->vdev_ops
->vdev_op_leaf
)
3674 vd
->vdev_ops
->vdev_op_close(vd
);
3677 * If we have brought this vdev back into service, we need
3678 * to notify fmd so that it can gracefully repair any outstanding
3679 * cases due to a missing device. We do this in all cases, even those
3680 * that probably don't correlate to a repaired fault. This is sure to
3681 * catch all cases, and we let the zfs-retire agent sort it out. If
3682 * this is a transient state it's OK, as the retire agent will
3683 * double-check the state of the vdev before repairing it.
3685 if (state
== VDEV_STATE_HEALTHY
&& vd
->vdev_ops
->vdev_op_leaf
&&
3686 vd
->vdev_prevstate
!= state
)
3687 zfs_post_state_change(spa
, vd
);
3689 if (vd
->vdev_removed
&&
3690 state
== VDEV_STATE_CANT_OPEN
&&
3691 (aux
== VDEV_AUX_OPEN_FAILED
|| vd
->vdev_checkremove
)) {
3693 * If the previous state is set to VDEV_STATE_REMOVED, then this
3694 * device was previously marked removed and someone attempted to
3695 * reopen it. If this failed due to a nonexistent device, then
3696 * keep the device in the REMOVED state. We also let this be if
3697 * it is one of our special test online cases, which is only
3698 * attempting to online the device and shouldn't generate an FMA
3701 vd
->vdev_state
= VDEV_STATE_REMOVED
;
3702 vd
->vdev_stat
.vs_aux
= VDEV_AUX_NONE
;
3703 } else if (state
== VDEV_STATE_REMOVED
) {
3704 vd
->vdev_removed
= B_TRUE
;
3705 } else if (state
== VDEV_STATE_CANT_OPEN
) {
3707 * If we fail to open a vdev during an import or recovery, we
3708 * mark it as "not available", which signifies that it was
3709 * never there to begin with. Failure to open such a device
3710 * is not considered an error.
3712 if ((spa_load_state(spa
) == SPA_LOAD_IMPORT
||
3713 spa_load_state(spa
) == SPA_LOAD_RECOVER
) &&
3714 vd
->vdev_ops
->vdev_op_leaf
)
3715 vd
->vdev_not_present
= 1;
3718 * Post the appropriate ereport. If the 'prevstate' field is
3719 * set to something other than VDEV_STATE_UNKNOWN, it indicates
3720 * that this is part of a vdev_reopen(). In this case, we don't
3721 * want to post the ereport if the device was already in the
3722 * CANT_OPEN state beforehand.
3724 * If the 'checkremove' flag is set, then this is an attempt to
3725 * online the device in response to an insertion event. If we
3726 * hit this case, then we have detected an insertion event for a
3727 * faulted or offline device that wasn't in the removed state.
3728 * In this scenario, we don't post an ereport because we are
3729 * about to replace the device, or attempt an online with
3730 * vdev_forcefault, which will generate the fault for us.
3732 if ((vd
->vdev_prevstate
!= state
|| vd
->vdev_forcefault
) &&
3733 !vd
->vdev_not_present
&& !vd
->vdev_checkremove
&&
3734 vd
!= spa
->spa_root_vdev
) {
3738 case VDEV_AUX_OPEN_FAILED
:
3739 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED
;
3741 case VDEV_AUX_CORRUPT_DATA
:
3742 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA
;
3744 case VDEV_AUX_NO_REPLICAS
:
3745 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS
;
3747 case VDEV_AUX_BAD_GUID_SUM
:
3748 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM
;
3750 case VDEV_AUX_TOO_SMALL
:
3751 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL
;
3753 case VDEV_AUX_BAD_LABEL
:
3754 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL
;
3757 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN
;
3760 zfs_ereport_post(class, spa
, vd
, NULL
, save_state
, 0);
3763 /* Erase any notion of persistent removed state */
3764 vd
->vdev_removed
= B_FALSE
;
3766 vd
->vdev_removed
= B_FALSE
;
3769 if (!isopen
&& vd
->vdev_parent
)
3770 vdev_propagate_state(vd
->vdev_parent
);
3774 vdev_children_are_offline(vdev_t
*vd
)
3776 ASSERT(!vd
->vdev_ops
->vdev_op_leaf
);
3778 for (uint64_t i
= 0; i
< vd
->vdev_children
; i
++) {
3779 if (vd
->vdev_child
[i
]->vdev_state
!= VDEV_STATE_OFFLINE
)
3787 * Check the vdev configuration to ensure that it's capable of supporting
3788 * a root pool. We do not support partial configuration.
3789 * In addition, only a single top-level vdev is allowed.
3792 vdev_is_bootable(vdev_t
*vd
)
3794 if (!vd
->vdev_ops
->vdev_op_leaf
) {
3795 char *vdev_type
= vd
->vdev_ops
->vdev_op_type
;
3797 if (strcmp(vdev_type
, VDEV_TYPE_ROOT
) == 0 &&
3798 vd
->vdev_children
> 1) {
3800 } else if (strcmp(vdev_type
, VDEV_TYPE_MISSING
) == 0 ||
3801 strcmp(vdev_type
, VDEV_TYPE_INDIRECT
) == 0) {
3806 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
3807 if (!vdev_is_bootable(vd
->vdev_child
[c
]))
3814 vdev_is_concrete(vdev_t
*vd
)
3816 vdev_ops_t
*ops
= vd
->vdev_ops
;
3817 if (ops
== &vdev_indirect_ops
|| ops
== &vdev_hole_ops
||
3818 ops
== &vdev_missing_ops
|| ops
== &vdev_root_ops
) {
3826 * Determine if a log device has valid content. If the vdev was
3827 * removed or faulted in the MOS config then we know that
3828 * the content on the log device has already been written to the pool.
3831 vdev_log_state_valid(vdev_t
*vd
)
3833 if (vd
->vdev_ops
->vdev_op_leaf
&& !vd
->vdev_faulted
&&
3837 for (int c
= 0; c
< vd
->vdev_children
; c
++)
3838 if (vdev_log_state_valid(vd
->vdev_child
[c
]))
3845 * Expand a vdev if possible.
3848 vdev_expand(vdev_t
*vd
, uint64_t txg
)
3850 ASSERT(vd
->vdev_top
== vd
);
3851 ASSERT(spa_config_held(vd
->vdev_spa
, SCL_ALL
, RW_WRITER
) == SCL_ALL
);
3853 vdev_set_deflate_ratio(vd
);
3855 if ((vd
->vdev_asize
>> vd
->vdev_ms_shift
) > vd
->vdev_ms_count
&&
3856 vdev_is_concrete(vd
)) {
3857 VERIFY(vdev_metaslab_init(vd
, txg
) == 0);
3858 vdev_config_dirty(vd
);
3866 vdev_split(vdev_t
*vd
)
3868 vdev_t
*cvd
, *pvd
= vd
->vdev_parent
;
3870 vdev_remove_child(pvd
, vd
);
3871 vdev_compact_children(pvd
);
3873 cvd
= pvd
->vdev_child
[0];
3874 if (pvd
->vdev_children
== 1) {
3875 vdev_remove_parent(cvd
);
3876 cvd
->vdev_splitting
= B_TRUE
;
3878 vdev_propagate_state(cvd
);
3882 vdev_deadman(vdev_t
*vd
)
3884 for (int c
= 0; c
< vd
->vdev_children
; c
++) {
3885 vdev_t
*cvd
= vd
->vdev_child
[c
];
3890 if (vd
->vdev_ops
->vdev_op_leaf
) {
3891 vdev_queue_t
*vq
= &vd
->vdev_queue
;
3893 mutex_enter(&vq
->vq_lock
);
3894 if (avl_numnodes(&vq
->vq_active_tree
) > 0) {
3895 spa_t
*spa
= vd
->vdev_spa
;
3900 * Look at the head of all the pending queues,
3901 * if any I/O has been outstanding for longer than
3902 * the spa_deadman_synctime we panic the system.
3904 fio
= avl_first(&vq
->vq_active_tree
);
3905 delta
= gethrtime() - fio
->io_timestamp
;
3906 if (delta
> spa_deadman_synctime(spa
)) {
3907 vdev_dbgmsg(vd
, "SLOW IO: zio timestamp "
3908 "%lluns, delta %lluns, last io %lluns",
3909 fio
->io_timestamp
, (u_longlong_t
)delta
,
3910 vq
->vq_io_complete_ts
);
3911 fm_panic("I/O to pool '%s' appears to be "
3912 "hung.", spa_name(spa
));
3915 mutex_exit(&vq
->vq_lock
);