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]
22 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
26 #include <sys/dsl_scan.h>
27 #include <sys/dsl_pool.h>
28 #include <sys/dsl_dataset.h>
29 #include <sys/dsl_prop.h>
30 #include <sys/dsl_dir.h>
31 #include <sys/dsl_synctask.h>
32 #include <sys/dnode.h>
33 #include <sys/dmu_tx.h>
34 #include <sys/dmu_objset.h>
38 #include <sys/zfs_context.h>
39 #include <sys/fs/zfs.h>
40 #include <sys/zfs_znode.h>
41 #include <sys/spa_impl.h>
42 #include <sys/vdev_impl.h>
43 #include <sys/zil_impl.h>
44 #include <sys/zio_checksum.h>
47 #include <sys/sa_impl.h>
48 #include <sys/zfeature.h>
50 #include <sys/zfs_vfsops.h>
53 typedef int (scan_cb_t
)(dsl_pool_t
*, const blkptr_t
*,
54 const zbookmark_phys_t
*);
56 static scan_cb_t dsl_scan_scrub_cb
;
57 static void dsl_scan_cancel_sync(void *, dmu_tx_t
*);
58 static void dsl_scan_sync_state(dsl_scan_t
*, dmu_tx_t
*tx
);
60 int zfs_top_maxinflight
= 32; /* maximum I/Os per top-level */
61 int zfs_resilver_delay
= 2; /* number of ticks to delay resilver */
62 int zfs_scrub_delay
= 4; /* number of ticks to delay scrub */
63 int zfs_scan_idle
= 50; /* idle window in clock ticks */
65 int zfs_scan_min_time_ms
= 1000; /* min millisecs to scrub per txg */
66 int zfs_free_min_time_ms
= 1000; /* min millisecs to free per txg */
67 int zfs_resilver_min_time_ms
= 3000; /* min millisecs to resilver per txg */
68 int zfs_no_scrub_io
= B_FALSE
; /* set to disable scrub i/o */
69 int zfs_no_scrub_prefetch
= B_FALSE
; /* set to disable scrub prefetch */
70 enum ddt_class zfs_scrub_ddt_class_max
= DDT_CLASS_DUPLICATE
;
71 int dsl_scan_delay_completion
= B_FALSE
; /* set to delay scan completion */
73 #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
74 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
75 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
77 /* the order has to match pool_scan_type */
78 static scan_cb_t
*scan_funcs
[POOL_SCAN_FUNCS
] = {
80 dsl_scan_scrub_cb
, /* POOL_SCAN_SCRUB */
81 dsl_scan_scrub_cb
, /* POOL_SCAN_RESILVER */
85 dsl_scan_init(dsl_pool_t
*dp
, uint64_t txg
)
89 spa_t
*spa
= dp
->dp_spa
;
92 scn
= dp
->dp_scan
= kmem_zalloc(sizeof (dsl_scan_t
), KM_SLEEP
);
96 * It's possible that we're resuming a scan after a reboot so
97 * make sure that the scan_async_destroying flag is initialized
100 ASSERT(!scn
->scn_async_destroying
);
101 scn
->scn_async_destroying
= spa_feature_is_active(dp
->dp_spa
,
102 SPA_FEATURE_ASYNC_DESTROY
);
104 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
105 "scrub_func", sizeof (uint64_t), 1, &f
);
108 * There was an old-style scrub in progress. Restart a
109 * new-style scrub from the beginning.
111 scn
->scn_restart_txg
= txg
;
112 zfs_dbgmsg("old-style scrub was in progress; "
113 "restarting new-style scrub in txg %llu",
114 scn
->scn_restart_txg
);
117 * Load the queue obj from the old location so that it
118 * can be freed by dsl_scan_done().
120 (void) zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
121 "scrub_queue", sizeof (uint64_t), 1,
122 &scn
->scn_phys
.scn_queue_obj
);
124 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
125 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
128 * Detect if the pool contains the signature of #2094. If it
129 * does properly update the scn->scn_phys structure and notify
130 * the administrator by setting an errata for the pool.
132 if (err
== EOVERFLOW
) {
133 uint64_t zaptmp
[SCAN_PHYS_NUMINTS
+ 1];
134 VERIFY3S(SCAN_PHYS_NUMINTS
, ==, 24);
135 VERIFY3S(offsetof(dsl_scan_phys_t
, scn_flags
), ==,
136 (23 * sizeof (uint64_t)));
138 err
= zap_lookup(dp
->dp_meta_objset
,
139 DMU_POOL_DIRECTORY_OBJECT
, DMU_POOL_SCAN
,
140 sizeof (uint64_t), SCAN_PHYS_NUMINTS
+ 1, &zaptmp
);
142 uint64_t overflow
= zaptmp
[SCAN_PHYS_NUMINTS
];
144 if (overflow
& ~DSL_SCAN_FLAGS_MASK
||
145 scn
->scn_async_destroying
) {
147 ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY
;
151 bcopy(zaptmp
, &scn
->scn_phys
,
152 SCAN_PHYS_NUMINTS
* sizeof (uint64_t));
153 scn
->scn_phys
.scn_flags
= overflow
;
155 /* Required scrub already in progress. */
156 if (scn
->scn_phys
.scn_state
== DSS_FINISHED
||
157 scn
->scn_phys
.scn_state
== DSS_CANCELED
)
159 ZPOOL_ERRATA_ZOL_2094_SCRUB
;
168 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
&&
169 spa_prev_software_version(dp
->dp_spa
) < SPA_VERSION_SCAN
) {
171 * A new-type scrub was in progress on an old
172 * pool, and the pool was accessed by old
173 * software. Restart from the beginning, since
174 * the old software may have changed the pool in
177 scn
->scn_restart_txg
= txg
;
178 zfs_dbgmsg("new-style scrub was modified "
179 "by old software; restarting in txg %llu",
180 scn
->scn_restart_txg
);
184 spa_scan_stat_init(spa
);
189 dsl_scan_fini(dsl_pool_t
*dp
)
192 kmem_free(dp
->dp_scan
, sizeof (dsl_scan_t
));
199 dsl_scan_setup_check(void *arg
, dmu_tx_t
*tx
)
201 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
203 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
)
204 return (SET_ERROR(EBUSY
));
210 dsl_scan_setup_sync(void *arg
, dmu_tx_t
*tx
)
212 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
213 pool_scan_func_t
*funcp
= arg
;
214 dmu_object_type_t ot
= 0;
215 dsl_pool_t
*dp
= scn
->scn_dp
;
216 spa_t
*spa
= dp
->dp_spa
;
218 ASSERT(scn
->scn_phys
.scn_state
!= DSS_SCANNING
);
219 ASSERT(*funcp
> POOL_SCAN_NONE
&& *funcp
< POOL_SCAN_FUNCS
);
220 bzero(&scn
->scn_phys
, sizeof (scn
->scn_phys
));
221 scn
->scn_phys
.scn_func
= *funcp
;
222 scn
->scn_phys
.scn_state
= DSS_SCANNING
;
223 scn
->scn_phys
.scn_min_txg
= 0;
224 scn
->scn_phys
.scn_max_txg
= tx
->tx_txg
;
225 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASSES
- 1; /* the entire DDT */
226 scn
->scn_phys
.scn_start_time
= gethrestime_sec();
227 scn
->scn_phys
.scn_errors
= 0;
228 scn
->scn_phys
.scn_to_examine
= spa
->spa_root_vdev
->vdev_stat
.vs_alloc
;
229 scn
->scn_restart_txg
= 0;
230 scn
->scn_done_txg
= 0;
231 spa_scan_stat_init(spa
);
233 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
234 scn
->scn_phys
.scn_ddt_class_max
= zfs_scrub_ddt_class_max
;
236 /* rewrite all disk labels */
237 vdev_config_dirty(spa
->spa_root_vdev
);
239 if (vdev_resilver_needed(spa
->spa_root_vdev
,
240 &scn
->scn_phys
.scn_min_txg
, &scn
->scn_phys
.scn_max_txg
)) {
241 spa_event_notify(spa
, NULL
,
242 FM_EREPORT_ZFS_RESILVER_START
);
244 spa_event_notify(spa
, NULL
,
245 FM_EREPORT_ZFS_SCRUB_START
);
248 spa
->spa_scrub_started
= B_TRUE
;
250 * If this is an incremental scrub, limit the DDT scrub phase
251 * to just the auto-ditto class (for correctness); the rest
252 * of the scrub should go faster using top-down pruning.
254 if (scn
->scn_phys
.scn_min_txg
> TXG_INITIAL
)
255 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASS_DITTO
;
259 /* back to the generic stuff */
261 if (dp
->dp_blkstats
== NULL
) {
262 dp
->dp_blkstats
= kmem_alloc(sizeof (zfs_all_blkstats_t
),
263 KM_PUSHPAGE
| KM_NODEBUG
);
265 bzero(dp
->dp_blkstats
, sizeof (zfs_all_blkstats_t
));
267 if (spa_version(spa
) < SPA_VERSION_DSL_SCRUB
)
268 ot
= DMU_OT_ZAP_OTHER
;
270 scn
->scn_phys
.scn_queue_obj
= zap_create(dp
->dp_meta_objset
,
271 ot
? ot
: DMU_OT_SCAN_QUEUE
, DMU_OT_NONE
, 0, tx
);
273 dsl_scan_sync_state(scn
, tx
);
275 spa_history_log_internal(spa
, "scan setup", tx
,
276 "func=%u mintxg=%llu maxtxg=%llu",
277 *funcp
, scn
->scn_phys
.scn_min_txg
, scn
->scn_phys
.scn_max_txg
);
282 dsl_scan_done(dsl_scan_t
*scn
, boolean_t complete
, dmu_tx_t
*tx
)
284 static const char *old_names
[] = {
286 "scrub_ddt_bookmark",
287 "scrub_ddt_class_max",
296 dsl_pool_t
*dp
= scn
->scn_dp
;
297 spa_t
*spa
= dp
->dp_spa
;
300 /* Remove any remnants of an old-style scrub. */
301 for (i
= 0; old_names
[i
]; i
++) {
302 (void) zap_remove(dp
->dp_meta_objset
,
303 DMU_POOL_DIRECTORY_OBJECT
, old_names
[i
], tx
);
306 if (scn
->scn_phys
.scn_queue_obj
!= 0) {
307 VERIFY(0 == dmu_object_free(dp
->dp_meta_objset
,
308 scn
->scn_phys
.scn_queue_obj
, tx
));
309 scn
->scn_phys
.scn_queue_obj
= 0;
313 * If we were "restarted" from a stopped state, don't bother
314 * with anything else.
316 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
320 scn
->scn_phys
.scn_state
= DSS_FINISHED
;
322 scn
->scn_phys
.scn_state
= DSS_CANCELED
;
324 spa_history_log_internal(spa
, "scan done", tx
,
325 "complete=%u", complete
);
327 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
328 mutex_enter(&spa
->spa_scrub_lock
);
329 while (spa
->spa_scrub_inflight
> 0) {
330 cv_wait(&spa
->spa_scrub_io_cv
,
331 &spa
->spa_scrub_lock
);
333 mutex_exit(&spa
->spa_scrub_lock
);
334 spa
->spa_scrub_started
= B_FALSE
;
335 spa
->spa_scrub_active
= B_FALSE
;
338 * If the scrub/resilver completed, update all DTLs to
339 * reflect this. Whether it succeeded or not, vacate
340 * all temporary scrub DTLs.
342 vdev_dtl_reassess(spa
->spa_root_vdev
, tx
->tx_txg
,
343 complete
? scn
->scn_phys
.scn_max_txg
: 0, B_TRUE
);
345 spa_event_notify(spa
, NULL
, scn
->scn_phys
.scn_min_txg
?
346 FM_EREPORT_ZFS_RESILVER_FINISH
:
347 FM_EREPORT_ZFS_SCRUB_FINISH
);
349 spa_errlog_rotate(spa
);
352 * We may have finished replacing a device.
353 * Let the async thread assess this and handle the detach.
355 spa_async_request(spa
, SPA_ASYNC_RESILVER_DONE
);
358 scn
->scn_phys
.scn_end_time
= gethrestime_sec();
360 if (spa
->spa_errata
== ZPOOL_ERRATA_ZOL_2094_SCRUB
)
366 dsl_scan_cancel_check(void *arg
, dmu_tx_t
*tx
)
368 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
370 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
371 return (SET_ERROR(ENOENT
));
377 dsl_scan_cancel_sync(void *arg
, dmu_tx_t
*tx
)
379 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
381 dsl_scan_done(scn
, B_FALSE
, tx
);
382 dsl_scan_sync_state(scn
, tx
);
386 dsl_scan_cancel(dsl_pool_t
*dp
)
388 return (dsl_sync_task(spa_name(dp
->dp_spa
), dsl_scan_cancel_check
,
389 dsl_scan_cancel_sync
, NULL
, 3));
392 static void dsl_scan_visitbp(blkptr_t
*bp
,
393 const zbookmark_phys_t
*zb
, dnode_phys_t
*dnp
, arc_buf_t
*pbuf
,
394 dsl_dataset_t
*ds
, dsl_scan_t
*scn
, dmu_objset_type_t ostype
,
396 inline __attribute__((always_inline
)) static void dsl_scan_visitdnode(
397 dsl_scan_t
*, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
398 dnode_phys_t
*dnp
, arc_buf_t
*buf
, uint64_t object
, dmu_tx_t
*tx
);
401 dsl_free(dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bp
)
403 zio_free(dp
->dp_spa
, txg
, bp
);
407 dsl_free_sync(zio_t
*pio
, dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bpp
)
409 ASSERT(dsl_pool_sync_context(dp
));
410 zio_nowait(zio_free_sync(pio
, dp
->dp_spa
, txg
, bpp
, pio
->io_flags
));
414 dsl_scan_ds_maxtxg(dsl_dataset_t
*ds
)
416 uint64_t smt
= ds
->ds_dir
->dd_pool
->dp_scan
->scn_phys
.scn_max_txg
;
417 if (dsl_dataset_is_snapshot(ds
))
418 return (MIN(smt
, ds
->ds_phys
->ds_creation_txg
));
423 dsl_scan_sync_state(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
425 VERIFY0(zap_update(scn
->scn_dp
->dp_meta_objset
,
426 DMU_POOL_DIRECTORY_OBJECT
,
427 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
428 &scn
->scn_phys
, tx
));
432 dsl_scan_check_pause(dsl_scan_t
*scn
, const zbookmark_phys_t
*zb
)
434 uint64_t elapsed_nanosecs
;
437 /* we never skip user/group accounting objects */
438 if (zb
&& (int64_t)zb
->zb_object
< 0)
441 if (scn
->scn_pausing
)
442 return (B_TRUE
); /* we're already pausing */
444 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
))
445 return (B_FALSE
); /* we're resuming */
447 /* We only know how to resume from level-0 blocks. */
448 if (zb
&& zb
->zb_level
!= 0)
451 mintime
= (scn
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
) ?
452 zfs_resilver_min_time_ms
: zfs_scan_min_time_ms
;
453 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
454 if (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
455 (NSEC2MSEC(elapsed_nanosecs
) > mintime
&&
456 txg_sync_waiting(scn
->scn_dp
)) ||
457 spa_shutting_down(scn
->scn_dp
->dp_spa
)) {
459 dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n",
460 (longlong_t
)zb
->zb_objset
,
461 (longlong_t
)zb
->zb_object
,
462 (longlong_t
)zb
->zb_level
,
463 (longlong_t
)zb
->zb_blkid
);
464 scn
->scn_phys
.scn_bookmark
= *zb
;
466 dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n",
467 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
468 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
469 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
470 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
471 scn
->scn_pausing
= B_TRUE
;
477 typedef struct zil_scan_arg
{
479 zil_header_t
*zsa_zh
;
484 dsl_scan_zil_block(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
486 zil_scan_arg_t
*zsa
= arg
;
487 dsl_pool_t
*dp
= zsa
->zsa_dp
;
488 dsl_scan_t
*scn
= dp
->dp_scan
;
489 zil_header_t
*zh
= zsa
->zsa_zh
;
492 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
496 * One block ("stubby") can be allocated a long time ago; we
497 * want to visit that one because it has been allocated
498 * (on-disk) even if it hasn't been claimed (even though for
499 * scrub there's nothing to do to it).
501 if (claim_txg
== 0 && bp
->blk_birth
>= spa_first_txg(dp
->dp_spa
))
504 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
505 ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
, bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
507 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
513 dsl_scan_zil_record(zilog_t
*zilog
, lr_t
*lrc
, void *arg
, uint64_t claim_txg
)
515 if (lrc
->lrc_txtype
== TX_WRITE
) {
516 zil_scan_arg_t
*zsa
= arg
;
517 dsl_pool_t
*dp
= zsa
->zsa_dp
;
518 dsl_scan_t
*scn
= dp
->dp_scan
;
519 zil_header_t
*zh
= zsa
->zsa_zh
;
520 lr_write_t
*lr
= (lr_write_t
*)lrc
;
521 blkptr_t
*bp
= &lr
->lr_blkptr
;
524 if (BP_IS_HOLE(bp
) ||
525 bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
529 * birth can be < claim_txg if this record's txg is
530 * already txg sync'ed (but this log block contains
531 * other records that are not synced)
533 if (claim_txg
== 0 || bp
->blk_birth
< claim_txg
)
536 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
537 lr
->lr_foid
, ZB_ZIL_LEVEL
,
538 lr
->lr_offset
/ BP_GET_LSIZE(bp
));
540 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
546 dsl_scan_zil(dsl_pool_t
*dp
, zil_header_t
*zh
)
548 uint64_t claim_txg
= zh
->zh_claim_txg
;
549 zil_scan_arg_t zsa
= { dp
, zh
};
553 * We only want to visit blocks that have been claimed but not yet
554 * replayed (or, in read-only mode, blocks that *would* be claimed).
556 if (claim_txg
== 0 && spa_writeable(dp
->dp_spa
))
559 zilog
= zil_alloc(dp
->dp_meta_objset
, zh
);
561 (void) zil_parse(zilog
, dsl_scan_zil_block
, dsl_scan_zil_record
, &zsa
,
569 dsl_scan_prefetch(dsl_scan_t
*scn
, arc_buf_t
*buf
, blkptr_t
*bp
,
570 uint64_t objset
, uint64_t object
, uint64_t blkid
)
572 zbookmark_phys_t czb
;
573 uint32_t flags
= ARC_NOWAIT
| ARC_PREFETCH
;
575 if (zfs_no_scrub_prefetch
)
578 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_min_txg
||
579 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_DNODE
))
582 SET_BOOKMARK(&czb
, objset
, object
, BP_GET_LEVEL(bp
), blkid
);
584 (void) arc_read(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
, bp
,
585 NULL
, NULL
, ZIO_PRIORITY_ASYNC_READ
,
586 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
, &flags
, &czb
);
590 dsl_scan_check_resume(dsl_scan_t
*scn
, const dnode_phys_t
*dnp
,
591 const zbookmark_phys_t
*zb
)
594 * We never skip over user/group accounting objects (obj<0)
596 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
) &&
597 (int64_t)zb
->zb_object
>= 0) {
599 * If we already visited this bp & everything below (in
600 * a prior txg sync), don't bother doing it again.
602 if (zbookmark_is_before(dnp
, zb
, &scn
->scn_phys
.scn_bookmark
))
606 * If we found the block we're trying to resume from, or
607 * we went past it to a different object, zero it out to
608 * indicate that it's OK to start checking for pausing
611 if (bcmp(zb
, &scn
->scn_phys
.scn_bookmark
, sizeof (*zb
)) == 0 ||
612 zb
->zb_object
> scn
->scn_phys
.scn_bookmark
.zb_object
) {
613 dprintf("resuming at %llx/%llx/%llx/%llx\n",
614 (longlong_t
)zb
->zb_objset
,
615 (longlong_t
)zb
->zb_object
,
616 (longlong_t
)zb
->zb_level
,
617 (longlong_t
)zb
->zb_blkid
);
618 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (*zb
));
625 * Return nonzero on i/o error.
626 * Return new buf to write out in *bufp.
628 inline __attribute__((always_inline
)) static int
629 dsl_scan_recurse(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
630 dnode_phys_t
*dnp
, const blkptr_t
*bp
,
631 const zbookmark_phys_t
*zb
, dmu_tx_t
*tx
, arc_buf_t
**bufp
)
633 dsl_pool_t
*dp
= scn
->scn_dp
;
634 int zio_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
;
637 if (BP_GET_LEVEL(bp
) > 0) {
638 uint32_t flags
= ARC_WAIT
;
641 int epb
= BP_GET_LSIZE(bp
) >> SPA_BLKPTRSHIFT
;
643 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, bufp
,
644 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
646 scn
->scn_phys
.scn_errors
++;
649 for (i
= 0, cbp
= (*bufp
)->b_data
; i
< epb
; i
++, cbp
++) {
650 dsl_scan_prefetch(scn
, *bufp
, cbp
, zb
->zb_objset
,
651 zb
->zb_object
, zb
->zb_blkid
* epb
+ i
);
653 for (i
= 0, cbp
= (*bufp
)->b_data
; i
< epb
; i
++, cbp
++) {
654 zbookmark_phys_t czb
;
656 SET_BOOKMARK(&czb
, zb
->zb_objset
, zb
->zb_object
,
658 zb
->zb_blkid
* epb
+ i
);
659 dsl_scan_visitbp(cbp
, &czb
, dnp
,
660 *bufp
, ds
, scn
, ostype
, tx
);
662 } else if (BP_GET_TYPE(bp
) == DMU_OT_USERGROUP_USED
) {
663 uint32_t flags
= ARC_WAIT
;
665 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, bufp
,
666 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
668 scn
->scn_phys
.scn_errors
++;
671 } else if (BP_GET_TYPE(bp
) == DMU_OT_DNODE
) {
672 uint32_t flags
= ARC_WAIT
;
675 int epb
= BP_GET_LSIZE(bp
) >> DNODE_SHIFT
;
677 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, bufp
,
678 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
680 scn
->scn_phys
.scn_errors
++;
683 for (i
= 0, cdnp
= (*bufp
)->b_data
; i
< epb
; i
++, cdnp
++) {
684 for (j
= 0; j
< cdnp
->dn_nblkptr
; j
++) {
685 blkptr_t
*cbp
= &cdnp
->dn_blkptr
[j
];
686 dsl_scan_prefetch(scn
, *bufp
, cbp
,
687 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
, j
);
690 for (i
= 0, cdnp
= (*bufp
)->b_data
; i
< epb
; i
++, cdnp
++) {
691 dsl_scan_visitdnode(scn
, ds
, ostype
,
692 cdnp
, *bufp
, zb
->zb_blkid
* epb
+ i
, tx
);
695 } else if (BP_GET_TYPE(bp
) == DMU_OT_OBJSET
) {
696 uint32_t flags
= ARC_WAIT
;
699 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, bufp
,
700 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
702 scn
->scn_phys
.scn_errors
++;
706 osp
= (*bufp
)->b_data
;
708 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
709 &osp
->os_meta_dnode
, *bufp
, DMU_META_DNODE_OBJECT
, tx
);
711 if (OBJSET_BUF_HAS_USERUSED(*bufp
)) {
713 * We also always visit user/group accounting
714 * objects, and never skip them, even if we are
715 * pausing. This is necessary so that the space
716 * deltas from this txg get integrated.
718 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
719 &osp
->os_groupused_dnode
, *bufp
,
720 DMU_GROUPUSED_OBJECT
, tx
);
721 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
722 &osp
->os_userused_dnode
, *bufp
,
723 DMU_USERUSED_OBJECT
, tx
);
730 inline __attribute__((always_inline
)) static void
731 dsl_scan_visitdnode(dsl_scan_t
*scn
, dsl_dataset_t
*ds
,
732 dmu_objset_type_t ostype
, dnode_phys_t
*dnp
, arc_buf_t
*buf
,
733 uint64_t object
, dmu_tx_t
*tx
)
737 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
738 zbookmark_phys_t czb
;
740 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
741 dnp
->dn_nlevels
- 1, j
);
742 dsl_scan_visitbp(&dnp
->dn_blkptr
[j
],
743 &czb
, dnp
, buf
, ds
, scn
, ostype
, tx
);
746 if (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
) {
747 zbookmark_phys_t czb
;
748 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
750 dsl_scan_visitbp(&dnp
->dn_spill
,
751 &czb
, dnp
, buf
, ds
, scn
, ostype
, tx
);
756 * The arguments are in this order because mdb can only print the
757 * first 5; we want them to be useful.
760 dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
761 dnode_phys_t
*dnp
, arc_buf_t
*pbuf
,
762 dsl_dataset_t
*ds
, dsl_scan_t
*scn
, dmu_objset_type_t ostype
,
765 dsl_pool_t
*dp
= scn
->scn_dp
;
766 arc_buf_t
*buf
= NULL
;
769 bp_toread
= kmem_alloc(sizeof (blkptr_t
), KM_PUSHPAGE
);
772 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
774 if (dsl_scan_check_pause(scn
, zb
))
777 if (dsl_scan_check_resume(scn
, dnp
, zb
))
783 scn
->scn_visited_this_txg
++;
786 * This debugging is commented out to conserve stack space. This
787 * function is called recursively and the debugging addes several
788 * bytes to the stack for each call. It can be commented back in
789 * if required to debug an issue in dsl_scan_visitbp().
792 * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p",
793 * ds, ds ? ds->ds_object : 0,
794 * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
798 if (bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
801 if (dsl_scan_recurse(scn
, ds
, ostype
, dnp
, bp_toread
, zb
, tx
,
806 * If dsl_scan_ddt() has aready visited this block, it will have
807 * already done any translations or scrubbing, so don't call the
810 if (ddt_class_contains(dp
->dp_spa
,
811 scn
->scn_phys
.scn_ddt_class_max
, bp
)) {
817 * If this block is from the future (after cur_max_txg), then we
818 * are doing this on behalf of a deleted snapshot, and we will
819 * revisit the future block on the next pass of this dataset.
820 * Don't scan it now unless we need to because something
821 * under it was modified.
823 if (BP_PHYSICAL_BIRTH(bp
) <= scn
->scn_phys
.scn_cur_max_txg
) {
824 scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, zb
);
827 (void) arc_buf_remove_ref(buf
, &buf
);
829 kmem_free(bp_toread
, sizeof (blkptr_t
));
833 dsl_scan_visit_rootbp(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, blkptr_t
*bp
,
838 SET_BOOKMARK(&zb
, ds
? ds
->ds_object
: DMU_META_OBJSET
,
839 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
840 dsl_scan_visitbp(bp
, &zb
, NULL
, NULL
,
841 ds
, scn
, DMU_OST_NONE
, tx
);
843 dprintf_ds(ds
, "finished scan%s", "");
847 dsl_scan_ds_destroyed(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
849 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
850 dsl_scan_t
*scn
= dp
->dp_scan
;
853 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
856 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
857 if (dsl_dataset_is_snapshot(ds
)) {
858 /* Note, scn_cur_{min,max}_txg stays the same. */
859 scn
->scn_phys
.scn_bookmark
.zb_objset
=
860 ds
->ds_phys
->ds_next_snap_obj
;
861 zfs_dbgmsg("destroying ds %llu; currently traversing; "
862 "reset zb_objset to %llu",
863 (u_longlong_t
)ds
->ds_object
,
864 (u_longlong_t
)ds
->ds_phys
->ds_next_snap_obj
);
865 scn
->scn_phys
.scn_flags
|= DSF_VISIT_DS_AGAIN
;
867 SET_BOOKMARK(&scn
->scn_phys
.scn_bookmark
,
868 ZB_DESTROYED_OBJSET
, 0, 0, 0);
869 zfs_dbgmsg("destroying ds %llu; currently traversing; "
870 "reset bookmark to -1,0,0,0",
871 (u_longlong_t
)ds
->ds_object
);
873 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
874 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
875 ASSERT3U(ds
->ds_phys
->ds_num_children
, <=, 1);
876 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
877 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
878 if (dsl_dataset_is_snapshot(ds
)) {
880 * We keep the same mintxg; it could be >
881 * ds_creation_txg if the previous snapshot was
884 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
885 scn
->scn_phys
.scn_queue_obj
,
886 ds
->ds_phys
->ds_next_snap_obj
, mintxg
, tx
) == 0);
887 zfs_dbgmsg("destroying ds %llu; in queue; "
888 "replacing with %llu",
889 (u_longlong_t
)ds
->ds_object
,
890 (u_longlong_t
)ds
->ds_phys
->ds_next_snap_obj
);
892 zfs_dbgmsg("destroying ds %llu; in queue; removing",
893 (u_longlong_t
)ds
->ds_object
);
896 zfs_dbgmsg("destroying ds %llu; ignoring",
897 (u_longlong_t
)ds
->ds_object
);
901 * dsl_scan_sync() should be called after this, and should sync
902 * out our changed state, but just to be safe, do it here.
904 dsl_scan_sync_state(scn
, tx
);
908 dsl_scan_ds_snapshotted(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
910 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
911 dsl_scan_t
*scn
= dp
->dp_scan
;
914 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
917 ASSERT(ds
->ds_phys
->ds_prev_snap_obj
!= 0);
919 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
920 scn
->scn_phys
.scn_bookmark
.zb_objset
=
921 ds
->ds_phys
->ds_prev_snap_obj
;
922 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
923 "reset zb_objset to %llu",
924 (u_longlong_t
)ds
->ds_object
,
925 (u_longlong_t
)ds
->ds_phys
->ds_prev_snap_obj
);
926 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
927 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
928 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
929 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
930 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
931 scn
->scn_phys
.scn_queue_obj
,
932 ds
->ds_phys
->ds_prev_snap_obj
, mintxg
, tx
) == 0);
933 zfs_dbgmsg("snapshotting ds %llu; in queue; "
934 "replacing with %llu",
935 (u_longlong_t
)ds
->ds_object
,
936 (u_longlong_t
)ds
->ds_phys
->ds_prev_snap_obj
);
938 dsl_scan_sync_state(scn
, tx
);
942 dsl_scan_ds_clone_swapped(dsl_dataset_t
*ds1
, dsl_dataset_t
*ds2
, dmu_tx_t
*tx
)
944 dsl_pool_t
*dp
= ds1
->ds_dir
->dd_pool
;
945 dsl_scan_t
*scn
= dp
->dp_scan
;
948 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
951 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds1
->ds_object
) {
952 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds2
->ds_object
;
953 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
954 "reset zb_objset to %llu",
955 (u_longlong_t
)ds1
->ds_object
,
956 (u_longlong_t
)ds2
->ds_object
);
957 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds2
->ds_object
) {
958 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds1
->ds_object
;
959 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
960 "reset zb_objset to %llu",
961 (u_longlong_t
)ds2
->ds_object
,
962 (u_longlong_t
)ds1
->ds_object
);
965 if (zap_lookup_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
966 ds1
->ds_object
, &mintxg
) == 0) {
969 ASSERT3U(mintxg
, ==, ds1
->ds_phys
->ds_prev_snap_txg
);
970 ASSERT3U(mintxg
, ==, ds2
->ds_phys
->ds_prev_snap_txg
);
971 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
972 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, tx
));
973 err
= zap_add_int_key(dp
->dp_meta_objset
,
974 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, mintxg
, tx
);
975 VERIFY(err
== 0 || err
== EEXIST
);
977 /* Both were there to begin with */
978 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
979 scn
->scn_phys
.scn_queue_obj
,
980 ds1
->ds_object
, mintxg
, tx
));
982 zfs_dbgmsg("clone_swap ds %llu; in queue; "
983 "replacing with %llu",
984 (u_longlong_t
)ds1
->ds_object
,
985 (u_longlong_t
)ds2
->ds_object
);
986 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
987 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, &mintxg
) == 0) {
988 ASSERT3U(mintxg
, ==, ds1
->ds_phys
->ds_prev_snap_txg
);
989 ASSERT3U(mintxg
, ==, ds2
->ds_phys
->ds_prev_snap_txg
);
990 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
991 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, tx
));
992 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
993 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, mintxg
, tx
));
994 zfs_dbgmsg("clone_swap ds %llu; in queue; "
995 "replacing with %llu",
996 (u_longlong_t
)ds2
->ds_object
,
997 (u_longlong_t
)ds1
->ds_object
);
1000 dsl_scan_sync_state(scn
, tx
);
1003 struct enqueue_clones_arg
{
1010 enqueue_clones_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1012 struct enqueue_clones_arg
*eca
= arg
;
1015 dsl_scan_t
*scn
= dp
->dp_scan
;
1017 if (hds
->ds_dir
->dd_phys
->dd_origin_obj
!= eca
->originobj
)
1020 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1024 while (ds
->ds_phys
->ds_prev_snap_obj
!= eca
->originobj
) {
1025 dsl_dataset_t
*prev
;
1026 err
= dsl_dataset_hold_obj(dp
,
1027 ds
->ds_phys
->ds_prev_snap_obj
, FTAG
, &prev
);
1029 dsl_dataset_rele(ds
, FTAG
);
1034 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1035 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1036 ds
->ds_phys
->ds_prev_snap_txg
, eca
->tx
) == 0);
1037 dsl_dataset_rele(ds
, FTAG
);
1042 dsl_scan_visitds(dsl_scan_t
*scn
, uint64_t dsobj
, dmu_tx_t
*tx
)
1044 dsl_pool_t
*dp
= scn
->scn_dp
;
1049 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1051 if (dmu_objset_from_ds(ds
, &os
))
1055 * Only the ZIL in the head (non-snapshot) is valid. Even though
1056 * snapshots can have ZIL block pointers (which may be the same
1057 * BP as in the head), they must be ignored. So we traverse the
1058 * ZIL here, rather than in scan_recurse(), because the regular
1059 * snapshot block-sharing rules don't apply to it.
1061 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
) && !dsl_dataset_is_snapshot(ds
))
1062 dsl_scan_zil(dp
, &os
->os_zil_header
);
1065 * Iterate over the bps in this ds.
1067 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1068 dsl_scan_visit_rootbp(scn
, ds
, &ds
->ds_phys
->ds_bp
, tx
);
1070 dsname
= kmem_alloc(ZFS_MAXNAMELEN
, KM_PUSHPAGE
);
1071 dsl_dataset_name(ds
, dsname
);
1072 zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; "
1074 (longlong_t
)dsobj
, dsname
,
1075 (longlong_t
)scn
->scn_phys
.scn_cur_min_txg
,
1076 (longlong_t
)scn
->scn_phys
.scn_cur_max_txg
,
1077 (int)scn
->scn_pausing
);
1078 kmem_free(dsname
, ZFS_MAXNAMELEN
);
1080 if (scn
->scn_pausing
)
1084 * We've finished this pass over this dataset.
1088 * If we did not completely visit this dataset, do another pass.
1090 if (scn
->scn_phys
.scn_flags
& DSF_VISIT_DS_AGAIN
) {
1091 zfs_dbgmsg("incomplete pass; visiting again");
1092 scn
->scn_phys
.scn_flags
&= ~DSF_VISIT_DS_AGAIN
;
1093 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1094 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1095 scn
->scn_phys
.scn_cur_max_txg
, tx
) == 0);
1100 * Add descendent datasets to work queue.
1102 if (ds
->ds_phys
->ds_next_snap_obj
!= 0) {
1103 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1104 scn
->scn_phys
.scn_queue_obj
, ds
->ds_phys
->ds_next_snap_obj
,
1105 ds
->ds_phys
->ds_creation_txg
, tx
) == 0);
1107 if (ds
->ds_phys
->ds_num_children
> 1) {
1108 boolean_t usenext
= B_FALSE
;
1109 if (ds
->ds_phys
->ds_next_clones_obj
!= 0) {
1112 * A bug in a previous version of the code could
1113 * cause upgrade_clones_cb() to not set
1114 * ds_next_snap_obj when it should, leading to a
1115 * missing entry. Therefore we can only use the
1116 * next_clones_obj when its count is correct.
1118 int err
= zap_count(dp
->dp_meta_objset
,
1119 ds
->ds_phys
->ds_next_clones_obj
, &count
);
1121 count
== ds
->ds_phys
->ds_num_children
- 1)
1126 VERIFY0(zap_join_key(dp
->dp_meta_objset
,
1127 ds
->ds_phys
->ds_next_clones_obj
,
1128 scn
->scn_phys
.scn_queue_obj
,
1129 ds
->ds_phys
->ds_creation_txg
, tx
));
1131 struct enqueue_clones_arg eca
;
1133 eca
.originobj
= ds
->ds_object
;
1135 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1136 enqueue_clones_cb
, &eca
, DS_FIND_CHILDREN
));
1141 dsl_dataset_rele(ds
, FTAG
);
1146 enqueue_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1151 dsl_scan_t
*scn
= dp
->dp_scan
;
1153 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1157 while (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
1158 dsl_dataset_t
*prev
;
1159 err
= dsl_dataset_hold_obj(dp
, ds
->ds_phys
->ds_prev_snap_obj
,
1162 dsl_dataset_rele(ds
, FTAG
);
1167 * If this is a clone, we don't need to worry about it for now.
1169 if (prev
->ds_phys
->ds_next_snap_obj
!= ds
->ds_object
) {
1170 dsl_dataset_rele(ds
, FTAG
);
1171 dsl_dataset_rele(prev
, FTAG
);
1174 dsl_dataset_rele(ds
, FTAG
);
1178 VERIFY(zap_add_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1179 ds
->ds_object
, ds
->ds_phys
->ds_prev_snap_txg
, tx
) == 0);
1180 dsl_dataset_rele(ds
, FTAG
);
1185 * Scrub/dedup interaction.
1187 * If there are N references to a deduped block, we don't want to scrub it
1188 * N times -- ideally, we should scrub it exactly once.
1190 * We leverage the fact that the dde's replication class (enum ddt_class)
1191 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest
1192 * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order.
1194 * To prevent excess scrubbing, the scrub begins by walking the DDT
1195 * to find all blocks with refcnt > 1, and scrubs each of these once.
1196 * Since there are two replication classes which contain blocks with
1197 * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first.
1198 * Finally the top-down scrub begins, only visiting blocks with refcnt == 1.
1200 * There would be nothing more to say if a block's refcnt couldn't change
1201 * during a scrub, but of course it can so we must account for changes
1202 * in a block's replication class.
1204 * Here's an example of what can occur:
1206 * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1
1207 * when visited during the top-down scrub phase, it will be scrubbed twice.
1208 * This negates our scrub optimization, but is otherwise harmless.
1210 * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1
1211 * on each visit during the top-down scrub phase, it will never be scrubbed.
1212 * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's
1213 * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to
1214 * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1
1215 * while a scrub is in progress, it scrubs the block right then.
1218 dsl_scan_ddt(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1220 ddt_bookmark_t
*ddb
= &scn
->scn_phys
.scn_ddt_bookmark
;
1225 bzero(&dde
, sizeof (ddt_entry_t
));
1227 while ((error
= ddt_walk(scn
->scn_dp
->dp_spa
, ddb
, &dde
)) == 0) {
1230 if (ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
)
1232 dprintf("visiting ddb=%llu/%llu/%llu/%llx\n",
1233 (longlong_t
)ddb
->ddb_class
,
1234 (longlong_t
)ddb
->ddb_type
,
1235 (longlong_t
)ddb
->ddb_checksum
,
1236 (longlong_t
)ddb
->ddb_cursor
);
1238 /* There should be no pending changes to the dedup table */
1239 ddt
= scn
->scn_dp
->dp_spa
->spa_ddt
[ddb
->ddb_checksum
];
1240 ASSERT(avl_first(&ddt
->ddt_tree
) == NULL
);
1242 dsl_scan_ddt_entry(scn
, ddb
->ddb_checksum
, &dde
, tx
);
1245 if (dsl_scan_check_pause(scn
, NULL
))
1249 zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u",
1250 (longlong_t
)n
, (int)scn
->scn_phys
.scn_ddt_class_max
,
1251 (int)scn
->scn_pausing
);
1253 ASSERT(error
== 0 || error
== ENOENT
);
1254 ASSERT(error
!= ENOENT
||
1255 ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
);
1260 dsl_scan_ddt_entry(dsl_scan_t
*scn
, enum zio_checksum checksum
,
1261 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
1263 const ddt_key_t
*ddk
= &dde
->dde_key
;
1264 ddt_phys_t
*ddp
= dde
->dde_phys
;
1266 zbookmark_phys_t zb
= { 0 };
1269 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1272 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1273 if (ddp
->ddp_phys_birth
== 0 ||
1274 ddp
->ddp_phys_birth
> scn
->scn_phys
.scn_max_txg
)
1276 ddt_bp_create(checksum
, ddk
, ddp
, &bp
);
1278 scn
->scn_visited_this_txg
++;
1279 scan_funcs
[scn
->scn_phys
.scn_func
](scn
->scn_dp
, &bp
, &zb
);
1284 dsl_scan_visit(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1286 dsl_pool_t
*dp
= scn
->scn_dp
;
1288 zap_attribute_t
*za
;
1290 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1291 scn
->scn_phys
.scn_ddt_class_max
) {
1292 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1293 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1294 dsl_scan_ddt(scn
, tx
);
1295 if (scn
->scn_pausing
)
1299 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== DMU_META_OBJSET
) {
1300 /* First do the MOS & ORIGIN */
1302 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1303 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1304 dsl_scan_visit_rootbp(scn
, NULL
,
1305 &dp
->dp_meta_rootbp
, tx
);
1306 spa_set_rootblkptr(dp
->dp_spa
, &dp
->dp_meta_rootbp
);
1307 if (scn
->scn_pausing
)
1310 if (spa_version(dp
->dp_spa
) < SPA_VERSION_DSL_SCRUB
) {
1311 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1312 enqueue_cb
, tx
, DS_FIND_CHILDREN
));
1314 dsl_scan_visitds(scn
,
1315 dp
->dp_origin_snap
->ds_object
, tx
);
1317 ASSERT(!scn
->scn_pausing
);
1318 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
!=
1319 ZB_DESTROYED_OBJSET
) {
1321 * If we were paused, continue from here. Note if the
1322 * ds we were paused on was deleted, the zb_objset may
1323 * be -1, so we will skip this and find a new objset
1326 dsl_scan_visitds(scn
, scn
->scn_phys
.scn_bookmark
.zb_objset
, tx
);
1327 if (scn
->scn_pausing
)
1332 * In case we were paused right at the end of the ds, zero the
1333 * bookmark so we don't think that we're still trying to resume.
1335 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (zbookmark_phys_t
));
1336 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_PUSHPAGE
);
1337 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_PUSHPAGE
);
1339 /* keep pulling things out of the zap-object-as-queue */
1340 while (zap_cursor_init(zc
, dp
->dp_meta_objset
,
1341 scn
->scn_phys
.scn_queue_obj
),
1342 zap_cursor_retrieve(zc
, za
) == 0) {
1346 dsobj
= strtonum(za
->za_name
, NULL
);
1347 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1348 scn
->scn_phys
.scn_queue_obj
, dsobj
, tx
));
1350 /* Set up min/max txg */
1351 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1352 if (za
->za_first_integer
!= 0) {
1353 scn
->scn_phys
.scn_cur_min_txg
=
1354 MAX(scn
->scn_phys
.scn_min_txg
,
1355 za
->za_first_integer
);
1357 scn
->scn_phys
.scn_cur_min_txg
=
1358 MAX(scn
->scn_phys
.scn_min_txg
,
1359 ds
->ds_phys
->ds_prev_snap_txg
);
1361 scn
->scn_phys
.scn_cur_max_txg
= dsl_scan_ds_maxtxg(ds
);
1362 dsl_dataset_rele(ds
, FTAG
);
1364 dsl_scan_visitds(scn
, dsobj
, tx
);
1365 zap_cursor_fini(zc
);
1366 if (scn
->scn_pausing
)
1369 zap_cursor_fini(zc
);
1371 kmem_free(za
, sizeof (zap_attribute_t
));
1372 kmem_free(zc
, sizeof (zap_cursor_t
));
1376 dsl_scan_free_should_pause(dsl_scan_t
*scn
)
1378 uint64_t elapsed_nanosecs
;
1383 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
1384 return (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
1385 (NSEC2MSEC(elapsed_nanosecs
) > zfs_free_min_time_ms
&&
1386 txg_sync_waiting(scn
->scn_dp
)) ||
1387 spa_shutting_down(scn
->scn_dp
->dp_spa
));
1391 dsl_scan_free_block_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1393 dsl_scan_t
*scn
= arg
;
1395 if (!scn
->scn_is_bptree
||
1396 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_OBJSET
)) {
1397 if (dsl_scan_free_should_pause(scn
))
1398 return (SET_ERROR(ERESTART
));
1401 zio_nowait(zio_free_sync(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
,
1402 dmu_tx_get_txg(tx
), bp
, 0));
1403 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
, DD_USED_HEAD
,
1404 -bp_get_dsize_sync(scn
->scn_dp
->dp_spa
, bp
),
1405 -BP_GET_PSIZE(bp
), -BP_GET_UCSIZE(bp
), tx
);
1406 scn
->scn_visited_this_txg
++;
1411 dsl_scan_active(dsl_scan_t
*scn
)
1413 spa_t
*spa
= scn
->scn_dp
->dp_spa
;
1414 uint64_t used
= 0, comp
, uncomp
;
1416 if (spa
->spa_load_state
!= SPA_LOAD_NONE
)
1418 if (spa_shutting_down(spa
))
1420 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
||
1421 (scn
->scn_async_destroying
&& !scn
->scn_async_stalled
))
1424 if (spa_version(scn
->scn_dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1425 (void) bpobj_space(&scn
->scn_dp
->dp_free_bpobj
,
1426 &used
, &comp
, &uncomp
);
1432 dsl_scan_sync(dsl_pool_t
*dp
, dmu_tx_t
*tx
)
1434 dsl_scan_t
*scn
= dp
->dp_scan
;
1435 spa_t
*spa
= dp
->dp_spa
;
1439 * Check for scn_restart_txg before checking spa_load_state, so
1440 * that we can restart an old-style scan while the pool is being
1441 * imported (see dsl_scan_init).
1443 if (scn
->scn_restart_txg
!= 0 &&
1444 scn
->scn_restart_txg
<= tx
->tx_txg
) {
1445 pool_scan_func_t func
= POOL_SCAN_SCRUB
;
1446 dsl_scan_done(scn
, B_FALSE
, tx
);
1447 if (vdev_resilver_needed(spa
->spa_root_vdev
, NULL
, NULL
))
1448 func
= POOL_SCAN_RESILVER
;
1449 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1451 dsl_scan_setup_sync(&func
, tx
);
1455 * If the scan is inactive due to a stalled async destroy, try again.
1457 if ((!scn
->scn_async_stalled
&& !dsl_scan_active(scn
)) ||
1458 spa_sync_pass(dp
->dp_spa
) > 1)
1461 scn
->scn_visited_this_txg
= 0;
1462 scn
->scn_pausing
= B_FALSE
;
1463 scn
->scn_sync_start_time
= gethrtime();
1464 spa
->spa_scrub_active
= B_TRUE
;
1467 * First process the async destroys. If we pause, don't do
1468 * any scrubbing or resilvering. This ensures that there are no
1469 * async destroys while we are scanning, so the scan code doesn't
1470 * have to worry about traversing it. It is also faster to free the
1471 * blocks than to scrub them.
1473 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1474 scn
->scn_is_bptree
= B_FALSE
;
1475 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1476 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1477 err
= bpobj_iterate(&dp
->dp_free_bpobj
,
1478 dsl_scan_free_block_cb
, scn
, tx
);
1479 VERIFY3U(0, ==, zio_wait(scn
->scn_zio_root
));
1481 if (err
!= 0 && err
!= ERESTART
)
1482 zfs_panic_recover("error %u from bpobj_iterate()", err
);
1485 if (err
== 0 && spa_feature_is_active(spa
, SPA_FEATURE_ASYNC_DESTROY
)) {
1486 ASSERT(scn
->scn_async_destroying
);
1487 scn
->scn_is_bptree
= B_TRUE
;
1488 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1489 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1490 err
= bptree_iterate(dp
->dp_meta_objset
,
1491 dp
->dp_bptree_obj
, B_TRUE
, dsl_scan_free_block_cb
, scn
, tx
);
1492 VERIFY0(zio_wait(scn
->scn_zio_root
));
1494 if (err
== EIO
|| err
== ECKSUM
) {
1496 } else if (err
!= 0 && err
!= ERESTART
) {
1497 zfs_panic_recover("error %u from "
1498 "traverse_dataset_destroyed()", err
);
1502 * If we didn't make progress, mark the async destroy as
1503 * stalled, so that we will not initiate a spa_sync() on
1506 scn
->scn_async_stalled
= (scn
->scn_visited_this_txg
== 0);
1508 if (bptree_is_empty(dp
->dp_meta_objset
, dp
->dp_bptree_obj
)) {
1509 /* finished; deactivate async destroy feature */
1510 spa_feature_decr(spa
, SPA_FEATURE_ASYNC_DESTROY
, tx
);
1511 ASSERT(!spa_feature_is_active(spa
,
1512 SPA_FEATURE_ASYNC_DESTROY
));
1513 VERIFY0(zap_remove(dp
->dp_meta_objset
,
1514 DMU_POOL_DIRECTORY_OBJECT
,
1515 DMU_POOL_BPTREE_OBJ
, tx
));
1516 VERIFY0(bptree_free(dp
->dp_meta_objset
,
1517 dp
->dp_bptree_obj
, tx
));
1518 dp
->dp_bptree_obj
= 0;
1519 scn
->scn_async_destroying
= B_FALSE
;
1522 if (scn
->scn_visited_this_txg
) {
1523 zfs_dbgmsg("freed %llu blocks in %llums from "
1524 "free_bpobj/bptree txg %llu; err=%u",
1525 (longlong_t
)scn
->scn_visited_this_txg
,
1527 NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
),
1528 (longlong_t
)tx
->tx_txg
, err
);
1529 scn
->scn_visited_this_txg
= 0;
1532 * Write out changes to the DDT that may be required as a
1533 * result of the blocks freed. This ensures that the DDT
1534 * is clean when a scrub/resilver runs.
1536 ddt_sync(spa
, tx
->tx_txg
);
1540 if (!scn
->scn_async_destroying
&& zfs_free_leak_on_eio
&&
1541 (dp
->dp_free_dir
->dd_phys
->dd_used_bytes
!= 0 ||
1542 dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
!= 0 ||
1543 dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
!= 0)) {
1545 * We have finished background destroying, but there is still
1546 * some space left in the dp_free_dir. Transfer this leaked
1547 * space to the dp_leak_dir.
1549 if (dp
->dp_leak_dir
== NULL
) {
1550 rrw_enter(&dp
->dp_config_rwlock
, RW_WRITER
, FTAG
);
1551 (void) dsl_dir_create_sync(dp
, dp
->dp_root_dir
,
1553 VERIFY0(dsl_pool_open_special_dir(dp
,
1554 LEAK_DIR_NAME
, &dp
->dp_leak_dir
));
1555 rrw_exit(&dp
->dp_config_rwlock
, FTAG
);
1557 dsl_dir_diduse_space(dp
->dp_leak_dir
, DD_USED_HEAD
,
1558 dp
->dp_free_dir
->dd_phys
->dd_used_bytes
,
1559 dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
,
1560 dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
, tx
);
1561 dsl_dir_diduse_space(dp
->dp_free_dir
, DD_USED_HEAD
,
1562 -dp
->dp_free_dir
->dd_phys
->dd_used_bytes
,
1563 -dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
,
1564 -dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
, tx
);
1566 if (!scn
->scn_async_destroying
) {
1567 /* finished; verify that space accounting went to zero */
1568 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_used_bytes
);
1569 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
);
1570 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
);
1573 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1576 if (scn
->scn_done_txg
== tx
->tx_txg
) {
1577 ASSERT(!scn
->scn_pausing
);
1578 /* finished with scan. */
1579 zfs_dbgmsg("txg %llu scan complete", tx
->tx_txg
);
1580 dsl_scan_done(scn
, B_TRUE
, tx
);
1581 ASSERT3U(spa
->spa_scrub_inflight
, ==, 0);
1582 dsl_scan_sync_state(scn
, tx
);
1586 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1587 scn
->scn_phys
.scn_ddt_class_max
) {
1588 zfs_dbgmsg("doing scan sync txg %llu; "
1589 "ddt bm=%llu/%llu/%llu/%llx",
1590 (longlong_t
)tx
->tx_txg
,
1591 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
1592 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
1593 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
1594 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
1595 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_objset
== 0);
1596 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_object
== 0);
1597 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_level
== 0);
1598 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_blkid
== 0);
1600 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1601 (longlong_t
)tx
->tx_txg
,
1602 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_objset
,
1603 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_object
,
1604 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_level
,
1605 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_blkid
);
1608 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1609 NULL
, ZIO_FLAG_CANFAIL
);
1610 dsl_pool_config_enter(dp
, FTAG
);
1611 dsl_scan_visit(scn
, tx
);
1612 dsl_pool_config_exit(dp
, FTAG
);
1613 (void) zio_wait(scn
->scn_zio_root
);
1614 scn
->scn_zio_root
= NULL
;
1616 zfs_dbgmsg("visited %llu blocks in %llums",
1617 (longlong_t
)scn
->scn_visited_this_txg
,
1618 (longlong_t
)NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
));
1620 if (!scn
->scn_pausing
) {
1621 scn
->scn_done_txg
= tx
->tx_txg
+ 1;
1622 zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
1623 tx
->tx_txg
, scn
->scn_done_txg
);
1626 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
1627 mutex_enter(&spa
->spa_scrub_lock
);
1628 while (spa
->spa_scrub_inflight
> 0) {
1629 cv_wait(&spa
->spa_scrub_io_cv
,
1630 &spa
->spa_scrub_lock
);
1632 mutex_exit(&spa
->spa_scrub_lock
);
1635 dsl_scan_sync_state(scn
, tx
);
1639 * This will start a new scan, or restart an existing one.
1642 dsl_resilver_restart(dsl_pool_t
*dp
, uint64_t txg
)
1646 tx
= dmu_tx_create_dd(dp
->dp_mos_dir
);
1647 VERIFY(0 == dmu_tx_assign(tx
, TXG_WAIT
));
1649 txg
= dmu_tx_get_txg(tx
);
1650 dp
->dp_scan
->scn_restart_txg
= txg
;
1653 dp
->dp_scan
->scn_restart_txg
= txg
;
1655 zfs_dbgmsg("restarting resilver txg=%llu", txg
);
1659 dsl_scan_resilvering(dsl_pool_t
*dp
)
1661 return (dp
->dp_scan
->scn_phys
.scn_state
== DSS_SCANNING
&&
1662 dp
->dp_scan
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
);
1670 count_block(zfs_all_blkstats_t
*zab
, const blkptr_t
*bp
)
1675 * If we resume after a reboot, zab will be NULL; don't record
1676 * incomplete stats in that case.
1681 for (i
= 0; i
< 4; i
++) {
1682 int l
= (i
< 2) ? BP_GET_LEVEL(bp
) : DN_MAX_LEVELS
;
1683 int t
= (i
& 1) ? BP_GET_TYPE(bp
) : DMU_OT_TOTAL
;
1687 if (t
& DMU_OT_NEWTYPE
)
1690 zb
= &zab
->zab_type
[l
][t
];
1692 zb
->zb_asize
+= BP_GET_ASIZE(bp
);
1693 zb
->zb_lsize
+= BP_GET_LSIZE(bp
);
1694 zb
->zb_psize
+= BP_GET_PSIZE(bp
);
1695 zb
->zb_gangs
+= BP_COUNT_GANG(bp
);
1697 switch (BP_GET_NDVAS(bp
)) {
1699 if (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1700 DVA_GET_VDEV(&bp
->blk_dva
[1]))
1701 zb
->zb_ditto_2_of_2_samevdev
++;
1704 equal
= (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1705 DVA_GET_VDEV(&bp
->blk_dva
[1])) +
1706 (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1707 DVA_GET_VDEV(&bp
->blk_dva
[2])) +
1708 (DVA_GET_VDEV(&bp
->blk_dva
[1]) ==
1709 DVA_GET_VDEV(&bp
->blk_dva
[2]));
1711 zb
->zb_ditto_2_of_3_samevdev
++;
1712 else if (equal
== 3)
1713 zb
->zb_ditto_3_of_3_samevdev
++;
1720 dsl_scan_scrub_done(zio_t
*zio
)
1722 spa_t
*spa
= zio
->io_spa
;
1724 zio_data_buf_free(zio
->io_data
, zio
->io_size
);
1726 mutex_enter(&spa
->spa_scrub_lock
);
1727 spa
->spa_scrub_inflight
--;
1728 cv_broadcast(&spa
->spa_scrub_io_cv
);
1730 if (zio
->io_error
&& (zio
->io_error
!= ECKSUM
||
1731 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
))) {
1732 spa
->spa_dsl_pool
->dp_scan
->scn_phys
.scn_errors
++;
1734 mutex_exit(&spa
->spa_scrub_lock
);
1738 dsl_scan_scrub_cb(dsl_pool_t
*dp
,
1739 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
1741 dsl_scan_t
*scn
= dp
->dp_scan
;
1742 size_t size
= BP_GET_PSIZE(bp
);
1743 spa_t
*spa
= dp
->dp_spa
;
1744 uint64_t phys_birth
= BP_PHYSICAL_BIRTH(bp
);
1745 boolean_t needs_io
= B_FALSE
;
1746 int zio_flags
= ZIO_FLAG_SCAN_THREAD
| ZIO_FLAG_RAW
| ZIO_FLAG_CANFAIL
;
1750 if (phys_birth
<= scn
->scn_phys
.scn_min_txg
||
1751 phys_birth
>= scn
->scn_phys
.scn_max_txg
)
1754 count_block(dp
->dp_blkstats
, bp
);
1756 if (BP_IS_EMBEDDED(bp
))
1759 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn
));
1760 if (scn
->scn_phys
.scn_func
== POOL_SCAN_SCRUB
) {
1761 zio_flags
|= ZIO_FLAG_SCRUB
;
1763 scan_delay
= zfs_scrub_delay
;
1765 ASSERT3U(scn
->scn_phys
.scn_func
, ==, POOL_SCAN_RESILVER
);
1766 zio_flags
|= ZIO_FLAG_RESILVER
;
1768 scan_delay
= zfs_resilver_delay
;
1771 /* If it's an intent log block, failure is expected. */
1772 if (zb
->zb_level
== ZB_ZIL_LEVEL
)
1773 zio_flags
|= ZIO_FLAG_SPECULATIVE
;
1775 for (d
= 0; d
< BP_GET_NDVAS(bp
); d
++) {
1776 vdev_t
*vd
= vdev_lookup_top(spa
,
1777 DVA_GET_VDEV(&bp
->blk_dva
[d
]));
1780 * Keep track of how much data we've examined so that
1781 * zpool(1M) status can make useful progress reports.
1783 scn
->scn_phys
.scn_examined
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1784 spa
->spa_scan_pass_exam
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1786 /* if it's a resilver, this may not be in the target range */
1788 if (DVA_GET_GANG(&bp
->blk_dva
[d
])) {
1790 * Gang members may be spread across multiple
1791 * vdevs, so the best estimate we have is the
1792 * scrub range, which has already been checked.
1793 * XXX -- it would be better to change our
1794 * allocation policy to ensure that all
1795 * gang members reside on the same vdev.
1799 needs_io
= vdev_dtl_contains(vd
, DTL_PARTIAL
,
1805 if (needs_io
&& !zfs_no_scrub_io
) {
1806 vdev_t
*rvd
= spa
->spa_root_vdev
;
1807 uint64_t maxinflight
= rvd
->vdev_children
* zfs_top_maxinflight
;
1808 void *data
= zio_data_buf_alloc(size
);
1810 mutex_enter(&spa
->spa_scrub_lock
);
1811 while (spa
->spa_scrub_inflight
>= maxinflight
)
1812 cv_wait(&spa
->spa_scrub_io_cv
, &spa
->spa_scrub_lock
);
1813 spa
->spa_scrub_inflight
++;
1814 mutex_exit(&spa
->spa_scrub_lock
);
1817 * If we're seeing recent (zfs_scan_idle) "important" I/Os
1818 * then throttle our workload to limit the impact of a scan.
1820 if (ddi_get_lbolt64() - spa
->spa_last_io
<= zfs_scan_idle
)
1823 zio_nowait(zio_read(NULL
, spa
, bp
, data
, size
,
1824 dsl_scan_scrub_done
, NULL
, ZIO_PRIORITY_SCRUB
,
1828 /* do not relocate this block */
1833 dsl_scan(dsl_pool_t
*dp
, pool_scan_func_t func
)
1835 spa_t
*spa
= dp
->dp_spa
;
1838 * Purge all vdev caches and probe all devices. We do this here
1839 * rather than in sync context because this requires a writer lock
1840 * on the spa_config lock, which we can't do from sync context. The
1841 * spa_scrub_reopen flag indicates that vdev_open() should not
1842 * attempt to start another scrub.
1844 spa_vdev_state_enter(spa
, SCL_NONE
);
1845 spa
->spa_scrub_reopen
= B_TRUE
;
1846 vdev_reopen(spa
->spa_root_vdev
);
1847 spa
->spa_scrub_reopen
= B_FALSE
;
1848 (void) spa_vdev_state_exit(spa
, NULL
, 0);
1850 return (dsl_sync_task(spa_name(spa
), dsl_scan_setup_check
,
1851 dsl_scan_setup_sync
, &func
, 0));
1854 #if defined(_KERNEL) && defined(HAVE_SPL)
1855 module_param(zfs_top_maxinflight
, int, 0644);
1856 MODULE_PARM_DESC(zfs_top_maxinflight
, "Max I/Os per top-level");
1858 module_param(zfs_resilver_delay
, int, 0644);
1859 MODULE_PARM_DESC(zfs_resilver_delay
, "Number of ticks to delay resilver");
1861 module_param(zfs_scrub_delay
, int, 0644);
1862 MODULE_PARM_DESC(zfs_scrub_delay
, "Number of ticks to delay scrub");
1864 module_param(zfs_scan_idle
, int, 0644);
1865 MODULE_PARM_DESC(zfs_scan_idle
, "Idle window in clock ticks");
1867 module_param(zfs_scan_min_time_ms
, int, 0644);
1868 MODULE_PARM_DESC(zfs_scan_min_time_ms
, "Min millisecs to scrub per txg");
1870 module_param(zfs_free_min_time_ms
, int, 0644);
1871 MODULE_PARM_DESC(zfs_free_min_time_ms
, "Min millisecs to free per txg");
1873 module_param(zfs_resilver_min_time_ms
, int, 0644);
1874 MODULE_PARM_DESC(zfs_resilver_min_time_ms
, "Min millisecs to resilver per txg");
1876 module_param(zfs_no_scrub_io
, int, 0644);
1877 MODULE_PARM_DESC(zfs_no_scrub_io
, "Set to disable scrub I/O");
1879 module_param(zfs_no_scrub_prefetch
, int, 0644);
1880 MODULE_PARM_DESC(zfs_no_scrub_prefetch
, "Set to disable scrub prefetching");