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 */
72 /* max number of blocks to free in a single TXG */
73 ulong zfs_free_max_blocks
= 100000;
75 #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
76 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
77 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
79 /* the order has to match pool_scan_type */
80 static scan_cb_t
*scan_funcs
[POOL_SCAN_FUNCS
] = {
82 dsl_scan_scrub_cb
, /* POOL_SCAN_SCRUB */
83 dsl_scan_scrub_cb
, /* POOL_SCAN_RESILVER */
87 dsl_scan_init(dsl_pool_t
*dp
, uint64_t txg
)
91 spa_t
*spa
= dp
->dp_spa
;
94 scn
= dp
->dp_scan
= kmem_zalloc(sizeof (dsl_scan_t
), KM_SLEEP
);
98 * It's possible that we're resuming a scan after a reboot so
99 * make sure that the scan_async_destroying flag is initialized
102 ASSERT(!scn
->scn_async_destroying
);
103 scn
->scn_async_destroying
= spa_feature_is_active(dp
->dp_spa
,
104 SPA_FEATURE_ASYNC_DESTROY
);
106 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
107 "scrub_func", sizeof (uint64_t), 1, &f
);
110 * There was an old-style scrub in progress. Restart a
111 * new-style scrub from the beginning.
113 scn
->scn_restart_txg
= txg
;
114 zfs_dbgmsg("old-style scrub was in progress; "
115 "restarting new-style scrub in txg %llu",
116 scn
->scn_restart_txg
);
119 * Load the queue obj from the old location so that it
120 * can be freed by dsl_scan_done().
122 (void) zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
123 "scrub_queue", sizeof (uint64_t), 1,
124 &scn
->scn_phys
.scn_queue_obj
);
126 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
127 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
130 * Detect if the pool contains the signature of #2094. If it
131 * does properly update the scn->scn_phys structure and notify
132 * the administrator by setting an errata for the pool.
134 if (err
== EOVERFLOW
) {
135 uint64_t zaptmp
[SCAN_PHYS_NUMINTS
+ 1];
136 VERIFY3S(SCAN_PHYS_NUMINTS
, ==, 24);
137 VERIFY3S(offsetof(dsl_scan_phys_t
, scn_flags
), ==,
138 (23 * sizeof (uint64_t)));
140 err
= zap_lookup(dp
->dp_meta_objset
,
141 DMU_POOL_DIRECTORY_OBJECT
, DMU_POOL_SCAN
,
142 sizeof (uint64_t), SCAN_PHYS_NUMINTS
+ 1, &zaptmp
);
144 uint64_t overflow
= zaptmp
[SCAN_PHYS_NUMINTS
];
146 if (overflow
& ~DSL_SCAN_FLAGS_MASK
||
147 scn
->scn_async_destroying
) {
149 ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY
;
153 bcopy(zaptmp
, &scn
->scn_phys
,
154 SCAN_PHYS_NUMINTS
* sizeof (uint64_t));
155 scn
->scn_phys
.scn_flags
= overflow
;
157 /* Required scrub already in progress. */
158 if (scn
->scn_phys
.scn_state
== DSS_FINISHED
||
159 scn
->scn_phys
.scn_state
== DSS_CANCELED
)
161 ZPOOL_ERRATA_ZOL_2094_SCRUB
;
170 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
&&
171 spa_prev_software_version(dp
->dp_spa
) < SPA_VERSION_SCAN
) {
173 * A new-type scrub was in progress on an old
174 * pool, and the pool was accessed by old
175 * software. Restart from the beginning, since
176 * the old software may have changed the pool in
179 scn
->scn_restart_txg
= txg
;
180 zfs_dbgmsg("new-style scrub was modified "
181 "by old software; restarting in txg %llu",
182 scn
->scn_restart_txg
);
186 spa_scan_stat_init(spa
);
191 dsl_scan_fini(dsl_pool_t
*dp
)
194 kmem_free(dp
->dp_scan
, sizeof (dsl_scan_t
));
201 dsl_scan_setup_check(void *arg
, dmu_tx_t
*tx
)
203 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
205 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
)
206 return (SET_ERROR(EBUSY
));
212 dsl_scan_setup_sync(void *arg
, dmu_tx_t
*tx
)
214 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
215 pool_scan_func_t
*funcp
= arg
;
216 dmu_object_type_t ot
= 0;
217 dsl_pool_t
*dp
= scn
->scn_dp
;
218 spa_t
*spa
= dp
->dp_spa
;
220 ASSERT(scn
->scn_phys
.scn_state
!= DSS_SCANNING
);
221 ASSERT(*funcp
> POOL_SCAN_NONE
&& *funcp
< POOL_SCAN_FUNCS
);
222 bzero(&scn
->scn_phys
, sizeof (scn
->scn_phys
));
223 scn
->scn_phys
.scn_func
= *funcp
;
224 scn
->scn_phys
.scn_state
= DSS_SCANNING
;
225 scn
->scn_phys
.scn_min_txg
= 0;
226 scn
->scn_phys
.scn_max_txg
= tx
->tx_txg
;
227 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASSES
- 1; /* the entire DDT */
228 scn
->scn_phys
.scn_start_time
= gethrestime_sec();
229 scn
->scn_phys
.scn_errors
= 0;
230 scn
->scn_phys
.scn_to_examine
= spa
->spa_root_vdev
->vdev_stat
.vs_alloc
;
231 scn
->scn_restart_txg
= 0;
232 scn
->scn_done_txg
= 0;
233 spa_scan_stat_init(spa
);
235 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
236 scn
->scn_phys
.scn_ddt_class_max
= zfs_scrub_ddt_class_max
;
238 /* rewrite all disk labels */
239 vdev_config_dirty(spa
->spa_root_vdev
);
241 if (vdev_resilver_needed(spa
->spa_root_vdev
,
242 &scn
->scn_phys
.scn_min_txg
, &scn
->scn_phys
.scn_max_txg
)) {
243 spa_event_notify(spa
, NULL
,
244 FM_EREPORT_ZFS_RESILVER_START
);
246 spa_event_notify(spa
, NULL
,
247 FM_EREPORT_ZFS_SCRUB_START
);
250 spa
->spa_scrub_started
= B_TRUE
;
252 * If this is an incremental scrub, limit the DDT scrub phase
253 * to just the auto-ditto class (for correctness); the rest
254 * of the scrub should go faster using top-down pruning.
256 if (scn
->scn_phys
.scn_min_txg
> TXG_INITIAL
)
257 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASS_DITTO
;
261 /* back to the generic stuff */
263 if (dp
->dp_blkstats
== NULL
) {
265 vmem_alloc(sizeof (zfs_all_blkstats_t
), KM_SLEEP
);
267 bzero(dp
->dp_blkstats
, sizeof (zfs_all_blkstats_t
));
269 if (spa_version(spa
) < SPA_VERSION_DSL_SCRUB
)
270 ot
= DMU_OT_ZAP_OTHER
;
272 scn
->scn_phys
.scn_queue_obj
= zap_create(dp
->dp_meta_objset
,
273 ot
? ot
: DMU_OT_SCAN_QUEUE
, DMU_OT_NONE
, 0, tx
);
275 dsl_scan_sync_state(scn
, tx
);
277 spa_history_log_internal(spa
, "scan setup", tx
,
278 "func=%u mintxg=%llu maxtxg=%llu",
279 *funcp
, scn
->scn_phys
.scn_min_txg
, scn
->scn_phys
.scn_max_txg
);
284 dsl_scan_done(dsl_scan_t
*scn
, boolean_t complete
, dmu_tx_t
*tx
)
286 static const char *old_names
[] = {
288 "scrub_ddt_bookmark",
289 "scrub_ddt_class_max",
298 dsl_pool_t
*dp
= scn
->scn_dp
;
299 spa_t
*spa
= dp
->dp_spa
;
302 /* Remove any remnants of an old-style scrub. */
303 for (i
= 0; old_names
[i
]; i
++) {
304 (void) zap_remove(dp
->dp_meta_objset
,
305 DMU_POOL_DIRECTORY_OBJECT
, old_names
[i
], tx
);
308 if (scn
->scn_phys
.scn_queue_obj
!= 0) {
309 VERIFY(0 == dmu_object_free(dp
->dp_meta_objset
,
310 scn
->scn_phys
.scn_queue_obj
, tx
));
311 scn
->scn_phys
.scn_queue_obj
= 0;
315 * If we were "restarted" from a stopped state, don't bother
316 * with anything else.
318 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
322 scn
->scn_phys
.scn_state
= DSS_FINISHED
;
324 scn
->scn_phys
.scn_state
= DSS_CANCELED
;
326 spa_history_log_internal(spa
, "scan done", tx
,
327 "complete=%u", complete
);
329 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
330 mutex_enter(&spa
->spa_scrub_lock
);
331 while (spa
->spa_scrub_inflight
> 0) {
332 cv_wait(&spa
->spa_scrub_io_cv
,
333 &spa
->spa_scrub_lock
);
335 mutex_exit(&spa
->spa_scrub_lock
);
336 spa
->spa_scrub_started
= B_FALSE
;
337 spa
->spa_scrub_active
= B_FALSE
;
340 * If the scrub/resilver completed, update all DTLs to
341 * reflect this. Whether it succeeded or not, vacate
342 * all temporary scrub DTLs.
344 vdev_dtl_reassess(spa
->spa_root_vdev
, tx
->tx_txg
,
345 complete
? scn
->scn_phys
.scn_max_txg
: 0, B_TRUE
);
347 spa_event_notify(spa
, NULL
, scn
->scn_phys
.scn_min_txg
?
348 FM_EREPORT_ZFS_RESILVER_FINISH
:
349 FM_EREPORT_ZFS_SCRUB_FINISH
);
351 spa_errlog_rotate(spa
);
354 * We may have finished replacing a device.
355 * Let the async thread assess this and handle the detach.
357 spa_async_request(spa
, SPA_ASYNC_RESILVER_DONE
);
360 scn
->scn_phys
.scn_end_time
= gethrestime_sec();
362 if (spa
->spa_errata
== ZPOOL_ERRATA_ZOL_2094_SCRUB
)
368 dsl_scan_cancel_check(void *arg
, dmu_tx_t
*tx
)
370 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
372 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
373 return (SET_ERROR(ENOENT
));
379 dsl_scan_cancel_sync(void *arg
, dmu_tx_t
*tx
)
381 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
383 dsl_scan_done(scn
, B_FALSE
, tx
);
384 dsl_scan_sync_state(scn
, tx
);
388 dsl_scan_cancel(dsl_pool_t
*dp
)
390 return (dsl_sync_task(spa_name(dp
->dp_spa
), dsl_scan_cancel_check
,
391 dsl_scan_cancel_sync
, NULL
, 3));
394 static void dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
395 dnode_phys_t
*dnp
, dsl_dataset_t
*ds
, dsl_scan_t
*scn
,
396 dmu_objset_type_t ostype
, dmu_tx_t
*tx
);
397 inline __attribute__((always_inline
)) static void dsl_scan_visitdnode(
398 dsl_scan_t
*, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
399 dnode_phys_t
*dnp
, uint64_t object
, dmu_tx_t
*tx
);
402 dsl_free(dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bp
)
404 zio_free(dp
->dp_spa
, txg
, bp
);
408 dsl_free_sync(zio_t
*pio
, dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bpp
)
410 ASSERT(dsl_pool_sync_context(dp
));
411 zio_nowait(zio_free_sync(pio
, dp
->dp_spa
, txg
, bpp
, pio
->io_flags
));
415 dsl_scan_ds_maxtxg(dsl_dataset_t
*ds
)
417 uint64_t smt
= ds
->ds_dir
->dd_pool
->dp_scan
->scn_phys
.scn_max_txg
;
418 if (dsl_dataset_is_snapshot(ds
))
419 return (MIN(smt
, ds
->ds_phys
->ds_creation_txg
));
424 dsl_scan_sync_state(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
426 VERIFY0(zap_update(scn
->scn_dp
->dp_meta_objset
,
427 DMU_POOL_DIRECTORY_OBJECT
,
428 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
429 &scn
->scn_phys
, tx
));
433 dsl_scan_check_pause(dsl_scan_t
*scn
, const zbookmark_phys_t
*zb
)
435 uint64_t elapsed_nanosecs
;
438 /* we never skip user/group accounting objects */
439 if (zb
&& (int64_t)zb
->zb_object
< 0)
442 if (scn
->scn_pausing
)
443 return (B_TRUE
); /* we're already pausing */
445 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
))
446 return (B_FALSE
); /* we're resuming */
448 /* We only know how to resume from level-0 blocks. */
449 if (zb
&& zb
->zb_level
!= 0)
452 mintime
= (scn
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
) ?
453 zfs_resilver_min_time_ms
: zfs_scan_min_time_ms
;
454 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
455 if (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
456 (NSEC2MSEC(elapsed_nanosecs
) > mintime
&&
457 txg_sync_waiting(scn
->scn_dp
)) ||
458 spa_shutting_down(scn
->scn_dp
->dp_spa
)) {
460 dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n",
461 (longlong_t
)zb
->zb_objset
,
462 (longlong_t
)zb
->zb_object
,
463 (longlong_t
)zb
->zb_level
,
464 (longlong_t
)zb
->zb_blkid
);
465 scn
->scn_phys
.scn_bookmark
= *zb
;
467 dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n",
468 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
469 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
470 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
471 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
472 scn
->scn_pausing
= B_TRUE
;
478 typedef struct zil_scan_arg
{
480 zil_header_t
*zsa_zh
;
485 dsl_scan_zil_block(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
487 zil_scan_arg_t
*zsa
= arg
;
488 dsl_pool_t
*dp
= zsa
->zsa_dp
;
489 dsl_scan_t
*scn
= dp
->dp_scan
;
490 zil_header_t
*zh
= zsa
->zsa_zh
;
493 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
497 * One block ("stubby") can be allocated a long time ago; we
498 * want to visit that one because it has been allocated
499 * (on-disk) even if it hasn't been claimed (even though for
500 * scrub there's nothing to do to it).
502 if (claim_txg
== 0 && bp
->blk_birth
>= spa_first_txg(dp
->dp_spa
))
505 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
506 ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
, bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
508 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
514 dsl_scan_zil_record(zilog_t
*zilog
, lr_t
*lrc
, void *arg
, uint64_t claim_txg
)
516 if (lrc
->lrc_txtype
== TX_WRITE
) {
517 zil_scan_arg_t
*zsa
= arg
;
518 dsl_pool_t
*dp
= zsa
->zsa_dp
;
519 dsl_scan_t
*scn
= dp
->dp_scan
;
520 zil_header_t
*zh
= zsa
->zsa_zh
;
521 lr_write_t
*lr
= (lr_write_t
*)lrc
;
522 blkptr_t
*bp
= &lr
->lr_blkptr
;
525 if (BP_IS_HOLE(bp
) ||
526 bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
530 * birth can be < claim_txg if this record's txg is
531 * already txg sync'ed (but this log block contains
532 * other records that are not synced)
534 if (claim_txg
== 0 || bp
->blk_birth
< claim_txg
)
537 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
538 lr
->lr_foid
, ZB_ZIL_LEVEL
,
539 lr
->lr_offset
/ BP_GET_LSIZE(bp
));
541 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
547 dsl_scan_zil(dsl_pool_t
*dp
, zil_header_t
*zh
)
549 uint64_t claim_txg
= zh
->zh_claim_txg
;
550 zil_scan_arg_t zsa
= { dp
, zh
};
554 * We only want to visit blocks that have been claimed but not yet
555 * replayed (or, in read-only mode, blocks that *would* be claimed).
557 if (claim_txg
== 0 && spa_writeable(dp
->dp_spa
))
560 zilog
= zil_alloc(dp
->dp_meta_objset
, zh
);
562 (void) zil_parse(zilog
, dsl_scan_zil_block
, dsl_scan_zil_record
, &zsa
,
570 dsl_scan_prefetch(dsl_scan_t
*scn
, arc_buf_t
*buf
, blkptr_t
*bp
,
571 uint64_t objset
, uint64_t object
, uint64_t blkid
)
573 zbookmark_phys_t czb
;
574 uint32_t flags
= ARC_NOWAIT
| ARC_PREFETCH
;
576 if (zfs_no_scrub_prefetch
)
579 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_min_txg
||
580 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_DNODE
))
583 SET_BOOKMARK(&czb
, objset
, object
, BP_GET_LEVEL(bp
), blkid
);
585 (void) arc_read(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
, bp
,
586 NULL
, NULL
, ZIO_PRIORITY_ASYNC_READ
,
587 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
, &flags
, &czb
);
591 dsl_scan_check_resume(dsl_scan_t
*scn
, const dnode_phys_t
*dnp
,
592 const zbookmark_phys_t
*zb
)
595 * We never skip over user/group accounting objects (obj<0)
597 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
) &&
598 (int64_t)zb
->zb_object
>= 0) {
600 * If we already visited this bp & everything below (in
601 * a prior txg sync), don't bother doing it again.
603 if (zbookmark_is_before(dnp
, zb
, &scn
->scn_phys
.scn_bookmark
))
607 * If we found the block we're trying to resume from, or
608 * we went past it to a different object, zero it out to
609 * indicate that it's OK to start checking for pausing
612 if (bcmp(zb
, &scn
->scn_phys
.scn_bookmark
, sizeof (*zb
)) == 0 ||
613 zb
->zb_object
> scn
->scn_phys
.scn_bookmark
.zb_object
) {
614 dprintf("resuming at %llx/%llx/%llx/%llx\n",
615 (longlong_t
)zb
->zb_objset
,
616 (longlong_t
)zb
->zb_object
,
617 (longlong_t
)zb
->zb_level
,
618 (longlong_t
)zb
->zb_blkid
);
619 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (*zb
));
626 * Return nonzero on i/o error.
627 * Return new buf to write out in *bufp.
629 inline __attribute__((always_inline
)) static int
630 dsl_scan_recurse(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
631 dnode_phys_t
*dnp
, const blkptr_t
*bp
,
632 const zbookmark_phys_t
*zb
, dmu_tx_t
*tx
)
634 dsl_pool_t
*dp
= scn
->scn_dp
;
635 int zio_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
;
638 if (BP_GET_LEVEL(bp
) > 0) {
639 uint32_t flags
= ARC_WAIT
;
642 int epb
= BP_GET_LSIZE(bp
) >> SPA_BLKPTRSHIFT
;
645 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
646 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
648 scn
->scn_phys
.scn_errors
++;
651 for (i
= 0, cbp
= buf
->b_data
; i
< epb
; i
++, cbp
++) {
652 dsl_scan_prefetch(scn
, buf
, cbp
, zb
->zb_objset
,
653 zb
->zb_object
, zb
->zb_blkid
* epb
+ i
);
655 for (i
= 0, cbp
= buf
->b_data
; i
< epb
; i
++, cbp
++) {
656 zbookmark_phys_t czb
;
658 SET_BOOKMARK(&czb
, zb
->zb_objset
, zb
->zb_object
,
660 zb
->zb_blkid
* epb
+ i
);
661 dsl_scan_visitbp(cbp
, &czb
, dnp
,
662 ds
, scn
, ostype
, tx
);
664 (void) arc_buf_remove_ref(buf
, &buf
);
665 } else if (BP_GET_TYPE(bp
) == DMU_OT_DNODE
) {
666 uint32_t flags
= ARC_WAIT
;
669 int epb
= BP_GET_LSIZE(bp
) >> DNODE_SHIFT
;
672 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
673 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
675 scn
->scn_phys
.scn_errors
++;
678 for (i
= 0, cdnp
= buf
->b_data
; i
< epb
; i
++, cdnp
++) {
679 for (j
= 0; j
< cdnp
->dn_nblkptr
; j
++) {
680 blkptr_t
*cbp
= &cdnp
->dn_blkptr
[j
];
681 dsl_scan_prefetch(scn
, buf
, cbp
,
682 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
, j
);
685 for (i
= 0, cdnp
= buf
->b_data
; i
< epb
; i
++, cdnp
++) {
686 dsl_scan_visitdnode(scn
, ds
, ostype
,
687 cdnp
, zb
->zb_blkid
* epb
+ i
, tx
);
690 (void) arc_buf_remove_ref(buf
, &buf
);
691 } else if (BP_GET_TYPE(bp
) == DMU_OT_OBJSET
) {
692 uint32_t flags
= ARC_WAIT
;
696 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
697 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
699 scn
->scn_phys
.scn_errors
++;
705 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
706 &osp
->os_meta_dnode
, DMU_META_DNODE_OBJECT
, tx
);
708 if (OBJSET_BUF_HAS_USERUSED(buf
)) {
710 * We also always visit user/group accounting
711 * objects, and never skip them, even if we are
712 * pausing. This is necessary so that the space
713 * deltas from this txg get integrated.
715 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
716 &osp
->os_groupused_dnode
,
717 DMU_GROUPUSED_OBJECT
, tx
);
718 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
719 &osp
->os_userused_dnode
,
720 DMU_USERUSED_OBJECT
, tx
);
722 (void) arc_buf_remove_ref(buf
, &buf
);
728 inline __attribute__((always_inline
)) static void
729 dsl_scan_visitdnode(dsl_scan_t
*scn
, dsl_dataset_t
*ds
,
730 dmu_objset_type_t ostype
, dnode_phys_t
*dnp
,
731 uint64_t object
, dmu_tx_t
*tx
)
735 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
736 zbookmark_phys_t czb
;
738 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
739 dnp
->dn_nlevels
- 1, j
);
740 dsl_scan_visitbp(&dnp
->dn_blkptr
[j
],
741 &czb
, dnp
, ds
, scn
, ostype
, tx
);
744 if (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
) {
745 zbookmark_phys_t czb
;
746 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
748 dsl_scan_visitbp(&dnp
->dn_spill
,
749 &czb
, dnp
, ds
, scn
, ostype
, tx
);
754 * The arguments are in this order because mdb can only print the
755 * first 5; we want them to be useful.
758 dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
759 dnode_phys_t
*dnp
, dsl_dataset_t
*ds
, dsl_scan_t
*scn
,
760 dmu_objset_type_t ostype
, dmu_tx_t
*tx
)
762 dsl_pool_t
*dp
= scn
->scn_dp
;
765 bp_toread
= kmem_alloc(sizeof (blkptr_t
), KM_SLEEP
);
768 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
770 if (dsl_scan_check_pause(scn
, zb
))
773 if (dsl_scan_check_resume(scn
, dnp
, zb
))
779 scn
->scn_visited_this_txg
++;
782 * This debugging is commented out to conserve stack space. This
783 * function is called recursively and the debugging addes several
784 * bytes to the stack for each call. It can be commented back in
785 * if required to debug an issue in dsl_scan_visitbp().
788 * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p",
789 * ds, ds ? ds->ds_object : 0,
790 * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
794 if (bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
797 if (dsl_scan_recurse(scn
, ds
, ostype
, dnp
, bp_toread
, zb
, tx
) != 0)
801 * If dsl_scan_ddt() has aready visited this block, it will have
802 * already done any translations or scrubbing, so don't call the
805 if (ddt_class_contains(dp
->dp_spa
,
806 scn
->scn_phys
.scn_ddt_class_max
, bp
)) {
811 * If this block is from the future (after cur_max_txg), then we
812 * are doing this on behalf of a deleted snapshot, and we will
813 * revisit the future block on the next pass of this dataset.
814 * Don't scan it now unless we need to because something
815 * under it was modified.
817 if (BP_PHYSICAL_BIRTH(bp
) <= scn
->scn_phys
.scn_cur_max_txg
) {
818 scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, zb
);
821 kmem_free(bp_toread
, sizeof (blkptr_t
));
825 dsl_scan_visit_rootbp(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, blkptr_t
*bp
,
830 SET_BOOKMARK(&zb
, ds
? ds
->ds_object
: DMU_META_OBJSET
,
831 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
832 dsl_scan_visitbp(bp
, &zb
, NULL
,
833 ds
, scn
, DMU_OST_NONE
, tx
);
835 dprintf_ds(ds
, "finished scan%s", "");
839 dsl_scan_ds_destroyed(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
841 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
842 dsl_scan_t
*scn
= dp
->dp_scan
;
845 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
848 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
849 if (dsl_dataset_is_snapshot(ds
)) {
850 /* Note, scn_cur_{min,max}_txg stays the same. */
851 scn
->scn_phys
.scn_bookmark
.zb_objset
=
852 ds
->ds_phys
->ds_next_snap_obj
;
853 zfs_dbgmsg("destroying ds %llu; currently traversing; "
854 "reset zb_objset to %llu",
855 (u_longlong_t
)ds
->ds_object
,
856 (u_longlong_t
)ds
->ds_phys
->ds_next_snap_obj
);
857 scn
->scn_phys
.scn_flags
|= DSF_VISIT_DS_AGAIN
;
859 SET_BOOKMARK(&scn
->scn_phys
.scn_bookmark
,
860 ZB_DESTROYED_OBJSET
, 0, 0, 0);
861 zfs_dbgmsg("destroying ds %llu; currently traversing; "
862 "reset bookmark to -1,0,0,0",
863 (u_longlong_t
)ds
->ds_object
);
865 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
866 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
867 ASSERT3U(ds
->ds_phys
->ds_num_children
, <=, 1);
868 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
869 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
870 if (dsl_dataset_is_snapshot(ds
)) {
872 * We keep the same mintxg; it could be >
873 * ds_creation_txg if the previous snapshot was
876 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
877 scn
->scn_phys
.scn_queue_obj
,
878 ds
->ds_phys
->ds_next_snap_obj
, mintxg
, tx
) == 0);
879 zfs_dbgmsg("destroying ds %llu; in queue; "
880 "replacing with %llu",
881 (u_longlong_t
)ds
->ds_object
,
882 (u_longlong_t
)ds
->ds_phys
->ds_next_snap_obj
);
884 zfs_dbgmsg("destroying ds %llu; in queue; removing",
885 (u_longlong_t
)ds
->ds_object
);
888 zfs_dbgmsg("destroying ds %llu; ignoring",
889 (u_longlong_t
)ds
->ds_object
);
893 * dsl_scan_sync() should be called after this, and should sync
894 * out our changed state, but just to be safe, do it here.
896 dsl_scan_sync_state(scn
, tx
);
900 dsl_scan_ds_snapshotted(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
902 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
903 dsl_scan_t
*scn
= dp
->dp_scan
;
906 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
909 ASSERT(ds
->ds_phys
->ds_prev_snap_obj
!= 0);
911 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
912 scn
->scn_phys
.scn_bookmark
.zb_objset
=
913 ds
->ds_phys
->ds_prev_snap_obj
;
914 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
915 "reset zb_objset to %llu",
916 (u_longlong_t
)ds
->ds_object
,
917 (u_longlong_t
)ds
->ds_phys
->ds_prev_snap_obj
);
918 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
919 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
920 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
921 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
922 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
923 scn
->scn_phys
.scn_queue_obj
,
924 ds
->ds_phys
->ds_prev_snap_obj
, mintxg
, tx
) == 0);
925 zfs_dbgmsg("snapshotting ds %llu; in queue; "
926 "replacing with %llu",
927 (u_longlong_t
)ds
->ds_object
,
928 (u_longlong_t
)ds
->ds_phys
->ds_prev_snap_obj
);
930 dsl_scan_sync_state(scn
, tx
);
934 dsl_scan_ds_clone_swapped(dsl_dataset_t
*ds1
, dsl_dataset_t
*ds2
, dmu_tx_t
*tx
)
936 dsl_pool_t
*dp
= ds1
->ds_dir
->dd_pool
;
937 dsl_scan_t
*scn
= dp
->dp_scan
;
940 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
943 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds1
->ds_object
) {
944 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds2
->ds_object
;
945 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
946 "reset zb_objset to %llu",
947 (u_longlong_t
)ds1
->ds_object
,
948 (u_longlong_t
)ds2
->ds_object
);
949 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds2
->ds_object
) {
950 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds1
->ds_object
;
951 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
952 "reset zb_objset to %llu",
953 (u_longlong_t
)ds2
->ds_object
,
954 (u_longlong_t
)ds1
->ds_object
);
957 if (zap_lookup_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
958 ds1
->ds_object
, &mintxg
) == 0) {
961 ASSERT3U(mintxg
, ==, ds1
->ds_phys
->ds_prev_snap_txg
);
962 ASSERT3U(mintxg
, ==, ds2
->ds_phys
->ds_prev_snap_txg
);
963 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
964 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, tx
));
965 err
= zap_add_int_key(dp
->dp_meta_objset
,
966 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, mintxg
, tx
);
967 VERIFY(err
== 0 || err
== EEXIST
);
969 /* Both were there to begin with */
970 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
971 scn
->scn_phys
.scn_queue_obj
,
972 ds1
->ds_object
, mintxg
, tx
));
974 zfs_dbgmsg("clone_swap ds %llu; in queue; "
975 "replacing with %llu",
976 (u_longlong_t
)ds1
->ds_object
,
977 (u_longlong_t
)ds2
->ds_object
);
978 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
979 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, &mintxg
) == 0) {
980 ASSERT3U(mintxg
, ==, ds1
->ds_phys
->ds_prev_snap_txg
);
981 ASSERT3U(mintxg
, ==, ds2
->ds_phys
->ds_prev_snap_txg
);
982 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
983 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, tx
));
984 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
985 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, mintxg
, tx
));
986 zfs_dbgmsg("clone_swap ds %llu; in queue; "
987 "replacing with %llu",
988 (u_longlong_t
)ds2
->ds_object
,
989 (u_longlong_t
)ds1
->ds_object
);
992 dsl_scan_sync_state(scn
, tx
);
995 struct enqueue_clones_arg
{
1002 enqueue_clones_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1004 struct enqueue_clones_arg
*eca
= arg
;
1007 dsl_scan_t
*scn
= dp
->dp_scan
;
1009 if (hds
->ds_dir
->dd_phys
->dd_origin_obj
!= eca
->originobj
)
1012 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1016 while (ds
->ds_phys
->ds_prev_snap_obj
!= eca
->originobj
) {
1017 dsl_dataset_t
*prev
;
1018 err
= dsl_dataset_hold_obj(dp
,
1019 ds
->ds_phys
->ds_prev_snap_obj
, FTAG
, &prev
);
1021 dsl_dataset_rele(ds
, FTAG
);
1026 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1027 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1028 ds
->ds_phys
->ds_prev_snap_txg
, eca
->tx
) == 0);
1029 dsl_dataset_rele(ds
, FTAG
);
1034 dsl_scan_visitds(dsl_scan_t
*scn
, uint64_t dsobj
, dmu_tx_t
*tx
)
1036 dsl_pool_t
*dp
= scn
->scn_dp
;
1041 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1043 if (dmu_objset_from_ds(ds
, &os
))
1047 * Only the ZIL in the head (non-snapshot) is valid. Even though
1048 * snapshots can have ZIL block pointers (which may be the same
1049 * BP as in the head), they must be ignored. So we traverse the
1050 * ZIL here, rather than in scan_recurse(), because the regular
1051 * snapshot block-sharing rules don't apply to it.
1053 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
) && !dsl_dataset_is_snapshot(ds
))
1054 dsl_scan_zil(dp
, &os
->os_zil_header
);
1057 * Iterate over the bps in this ds.
1059 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1060 dsl_scan_visit_rootbp(scn
, ds
, &ds
->ds_phys
->ds_bp
, tx
);
1062 dsname
= kmem_alloc(ZFS_MAXNAMELEN
, KM_SLEEP
);
1063 dsl_dataset_name(ds
, dsname
);
1064 zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; "
1066 (longlong_t
)dsobj
, dsname
,
1067 (longlong_t
)scn
->scn_phys
.scn_cur_min_txg
,
1068 (longlong_t
)scn
->scn_phys
.scn_cur_max_txg
,
1069 (int)scn
->scn_pausing
);
1070 kmem_free(dsname
, ZFS_MAXNAMELEN
);
1072 if (scn
->scn_pausing
)
1076 * We've finished this pass over this dataset.
1080 * If we did not completely visit this dataset, do another pass.
1082 if (scn
->scn_phys
.scn_flags
& DSF_VISIT_DS_AGAIN
) {
1083 zfs_dbgmsg("incomplete pass; visiting again");
1084 scn
->scn_phys
.scn_flags
&= ~DSF_VISIT_DS_AGAIN
;
1085 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1086 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1087 scn
->scn_phys
.scn_cur_max_txg
, tx
) == 0);
1092 * Add descendent datasets to work queue.
1094 if (ds
->ds_phys
->ds_next_snap_obj
!= 0) {
1095 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1096 scn
->scn_phys
.scn_queue_obj
, ds
->ds_phys
->ds_next_snap_obj
,
1097 ds
->ds_phys
->ds_creation_txg
, tx
) == 0);
1099 if (ds
->ds_phys
->ds_num_children
> 1) {
1100 boolean_t usenext
= B_FALSE
;
1101 if (ds
->ds_phys
->ds_next_clones_obj
!= 0) {
1104 * A bug in a previous version of the code could
1105 * cause upgrade_clones_cb() to not set
1106 * ds_next_snap_obj when it should, leading to a
1107 * missing entry. Therefore we can only use the
1108 * next_clones_obj when its count is correct.
1110 int err
= zap_count(dp
->dp_meta_objset
,
1111 ds
->ds_phys
->ds_next_clones_obj
, &count
);
1113 count
== ds
->ds_phys
->ds_num_children
- 1)
1118 VERIFY0(zap_join_key(dp
->dp_meta_objset
,
1119 ds
->ds_phys
->ds_next_clones_obj
,
1120 scn
->scn_phys
.scn_queue_obj
,
1121 ds
->ds_phys
->ds_creation_txg
, tx
));
1123 struct enqueue_clones_arg eca
;
1125 eca
.originobj
= ds
->ds_object
;
1127 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1128 enqueue_clones_cb
, &eca
, DS_FIND_CHILDREN
));
1133 dsl_dataset_rele(ds
, FTAG
);
1138 enqueue_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1143 dsl_scan_t
*scn
= dp
->dp_scan
;
1145 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1149 while (ds
->ds_phys
->ds_prev_snap_obj
!= 0) {
1150 dsl_dataset_t
*prev
;
1151 err
= dsl_dataset_hold_obj(dp
, ds
->ds_phys
->ds_prev_snap_obj
,
1154 dsl_dataset_rele(ds
, FTAG
);
1159 * If this is a clone, we don't need to worry about it for now.
1161 if (prev
->ds_phys
->ds_next_snap_obj
!= ds
->ds_object
) {
1162 dsl_dataset_rele(ds
, FTAG
);
1163 dsl_dataset_rele(prev
, FTAG
);
1166 dsl_dataset_rele(ds
, FTAG
);
1170 VERIFY(zap_add_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1171 ds
->ds_object
, ds
->ds_phys
->ds_prev_snap_txg
, tx
) == 0);
1172 dsl_dataset_rele(ds
, FTAG
);
1177 * Scrub/dedup interaction.
1179 * If there are N references to a deduped block, we don't want to scrub it
1180 * N times -- ideally, we should scrub it exactly once.
1182 * We leverage the fact that the dde's replication class (enum ddt_class)
1183 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest
1184 * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order.
1186 * To prevent excess scrubbing, the scrub begins by walking the DDT
1187 * to find all blocks with refcnt > 1, and scrubs each of these once.
1188 * Since there are two replication classes which contain blocks with
1189 * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first.
1190 * Finally the top-down scrub begins, only visiting blocks with refcnt == 1.
1192 * There would be nothing more to say if a block's refcnt couldn't change
1193 * during a scrub, but of course it can so we must account for changes
1194 * in a block's replication class.
1196 * Here's an example of what can occur:
1198 * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1
1199 * when visited during the top-down scrub phase, it will be scrubbed twice.
1200 * This negates our scrub optimization, but is otherwise harmless.
1202 * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1
1203 * on each visit during the top-down scrub phase, it will never be scrubbed.
1204 * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's
1205 * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to
1206 * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1
1207 * while a scrub is in progress, it scrubs the block right then.
1210 dsl_scan_ddt(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1212 ddt_bookmark_t
*ddb
= &scn
->scn_phys
.scn_ddt_bookmark
;
1217 bzero(&dde
, sizeof (ddt_entry_t
));
1219 while ((error
= ddt_walk(scn
->scn_dp
->dp_spa
, ddb
, &dde
)) == 0) {
1222 if (ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
)
1224 dprintf("visiting ddb=%llu/%llu/%llu/%llx\n",
1225 (longlong_t
)ddb
->ddb_class
,
1226 (longlong_t
)ddb
->ddb_type
,
1227 (longlong_t
)ddb
->ddb_checksum
,
1228 (longlong_t
)ddb
->ddb_cursor
);
1230 /* There should be no pending changes to the dedup table */
1231 ddt
= scn
->scn_dp
->dp_spa
->spa_ddt
[ddb
->ddb_checksum
];
1232 ASSERT(avl_first(&ddt
->ddt_tree
) == NULL
);
1234 dsl_scan_ddt_entry(scn
, ddb
->ddb_checksum
, &dde
, tx
);
1237 if (dsl_scan_check_pause(scn
, NULL
))
1241 zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u",
1242 (longlong_t
)n
, (int)scn
->scn_phys
.scn_ddt_class_max
,
1243 (int)scn
->scn_pausing
);
1245 ASSERT(error
== 0 || error
== ENOENT
);
1246 ASSERT(error
!= ENOENT
||
1247 ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
);
1252 dsl_scan_ddt_entry(dsl_scan_t
*scn
, enum zio_checksum checksum
,
1253 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
1255 const ddt_key_t
*ddk
= &dde
->dde_key
;
1256 ddt_phys_t
*ddp
= dde
->dde_phys
;
1258 zbookmark_phys_t zb
= { 0 };
1261 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1264 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1265 if (ddp
->ddp_phys_birth
== 0 ||
1266 ddp
->ddp_phys_birth
> scn
->scn_phys
.scn_max_txg
)
1268 ddt_bp_create(checksum
, ddk
, ddp
, &bp
);
1270 scn
->scn_visited_this_txg
++;
1271 scan_funcs
[scn
->scn_phys
.scn_func
](scn
->scn_dp
, &bp
, &zb
);
1276 dsl_scan_visit(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1278 dsl_pool_t
*dp
= scn
->scn_dp
;
1280 zap_attribute_t
*za
;
1282 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1283 scn
->scn_phys
.scn_ddt_class_max
) {
1284 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1285 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1286 dsl_scan_ddt(scn
, tx
);
1287 if (scn
->scn_pausing
)
1291 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== DMU_META_OBJSET
) {
1292 /* First do the MOS & ORIGIN */
1294 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1295 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1296 dsl_scan_visit_rootbp(scn
, NULL
,
1297 &dp
->dp_meta_rootbp
, tx
);
1298 spa_set_rootblkptr(dp
->dp_spa
, &dp
->dp_meta_rootbp
);
1299 if (scn
->scn_pausing
)
1302 if (spa_version(dp
->dp_spa
) < SPA_VERSION_DSL_SCRUB
) {
1303 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1304 enqueue_cb
, tx
, DS_FIND_CHILDREN
));
1306 dsl_scan_visitds(scn
,
1307 dp
->dp_origin_snap
->ds_object
, tx
);
1309 ASSERT(!scn
->scn_pausing
);
1310 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
!=
1311 ZB_DESTROYED_OBJSET
) {
1313 * If we were paused, continue from here. Note if the
1314 * ds we were paused on was deleted, the zb_objset may
1315 * be -1, so we will skip this and find a new objset
1318 dsl_scan_visitds(scn
, scn
->scn_phys
.scn_bookmark
.zb_objset
, tx
);
1319 if (scn
->scn_pausing
)
1324 * In case we were paused right at the end of the ds, zero the
1325 * bookmark so we don't think that we're still trying to resume.
1327 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (zbookmark_phys_t
));
1328 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_SLEEP
);
1329 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
1331 /* keep pulling things out of the zap-object-as-queue */
1332 while (zap_cursor_init(zc
, dp
->dp_meta_objset
,
1333 scn
->scn_phys
.scn_queue_obj
),
1334 zap_cursor_retrieve(zc
, za
) == 0) {
1338 dsobj
= strtonum(za
->za_name
, NULL
);
1339 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1340 scn
->scn_phys
.scn_queue_obj
, dsobj
, tx
));
1342 /* Set up min/max txg */
1343 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1344 if (za
->za_first_integer
!= 0) {
1345 scn
->scn_phys
.scn_cur_min_txg
=
1346 MAX(scn
->scn_phys
.scn_min_txg
,
1347 za
->za_first_integer
);
1349 scn
->scn_phys
.scn_cur_min_txg
=
1350 MAX(scn
->scn_phys
.scn_min_txg
,
1351 ds
->ds_phys
->ds_prev_snap_txg
);
1353 scn
->scn_phys
.scn_cur_max_txg
= dsl_scan_ds_maxtxg(ds
);
1354 dsl_dataset_rele(ds
, FTAG
);
1356 dsl_scan_visitds(scn
, dsobj
, tx
);
1357 zap_cursor_fini(zc
);
1358 if (scn
->scn_pausing
)
1361 zap_cursor_fini(zc
);
1363 kmem_free(za
, sizeof (zap_attribute_t
));
1364 kmem_free(zc
, sizeof (zap_cursor_t
));
1368 dsl_scan_free_should_pause(dsl_scan_t
*scn
)
1370 uint64_t elapsed_nanosecs
;
1375 if (scn
->scn_visited_this_txg
>= zfs_free_max_blocks
)
1378 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
1379 return (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
1380 (NSEC2MSEC(elapsed_nanosecs
) > zfs_free_min_time_ms
&&
1381 txg_sync_waiting(scn
->scn_dp
)) ||
1382 spa_shutting_down(scn
->scn_dp
->dp_spa
));
1386 dsl_scan_free_block_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1388 dsl_scan_t
*scn
= arg
;
1390 if (!scn
->scn_is_bptree
||
1391 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_OBJSET
)) {
1392 if (dsl_scan_free_should_pause(scn
))
1393 return (SET_ERROR(ERESTART
));
1396 zio_nowait(zio_free_sync(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
,
1397 dmu_tx_get_txg(tx
), bp
, 0));
1398 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
, DD_USED_HEAD
,
1399 -bp_get_dsize_sync(scn
->scn_dp
->dp_spa
, bp
),
1400 -BP_GET_PSIZE(bp
), -BP_GET_UCSIZE(bp
), tx
);
1401 scn
->scn_visited_this_txg
++;
1406 dsl_scan_active(dsl_scan_t
*scn
)
1408 spa_t
*spa
= scn
->scn_dp
->dp_spa
;
1409 uint64_t used
= 0, comp
, uncomp
;
1411 if (spa
->spa_load_state
!= SPA_LOAD_NONE
)
1413 if (spa_shutting_down(spa
))
1415 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
||
1416 (scn
->scn_async_destroying
&& !scn
->scn_async_stalled
))
1419 if (spa_version(scn
->scn_dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1420 (void) bpobj_space(&scn
->scn_dp
->dp_free_bpobj
,
1421 &used
, &comp
, &uncomp
);
1427 dsl_scan_sync(dsl_pool_t
*dp
, dmu_tx_t
*tx
)
1429 dsl_scan_t
*scn
= dp
->dp_scan
;
1430 spa_t
*spa
= dp
->dp_spa
;
1434 * Check for scn_restart_txg before checking spa_load_state, so
1435 * that we can restart an old-style scan while the pool is being
1436 * imported (see dsl_scan_init).
1438 if (scn
->scn_restart_txg
!= 0 &&
1439 scn
->scn_restart_txg
<= tx
->tx_txg
) {
1440 pool_scan_func_t func
= POOL_SCAN_SCRUB
;
1441 dsl_scan_done(scn
, B_FALSE
, tx
);
1442 if (vdev_resilver_needed(spa
->spa_root_vdev
, NULL
, NULL
))
1443 func
= POOL_SCAN_RESILVER
;
1444 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1446 dsl_scan_setup_sync(&func
, tx
);
1450 * If the scan is inactive due to a stalled async destroy, try again.
1452 if ((!scn
->scn_async_stalled
&& !dsl_scan_active(scn
)) ||
1453 spa_sync_pass(dp
->dp_spa
) > 1)
1456 scn
->scn_visited_this_txg
= 0;
1457 scn
->scn_pausing
= B_FALSE
;
1458 scn
->scn_sync_start_time
= gethrtime();
1459 spa
->spa_scrub_active
= B_TRUE
;
1462 * First process the async destroys. If we pause, don't do
1463 * any scrubbing or resilvering. This ensures that there are no
1464 * async destroys while we are scanning, so the scan code doesn't
1465 * have to worry about traversing it. It is also faster to free the
1466 * blocks than to scrub them.
1468 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1469 scn
->scn_is_bptree
= B_FALSE
;
1470 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1471 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1472 err
= bpobj_iterate(&dp
->dp_free_bpobj
,
1473 dsl_scan_free_block_cb
, scn
, tx
);
1474 VERIFY3U(0, ==, zio_wait(scn
->scn_zio_root
));
1476 if (err
!= 0 && err
!= ERESTART
)
1477 zfs_panic_recover("error %u from bpobj_iterate()", err
);
1480 if (err
== 0 && spa_feature_is_active(spa
, SPA_FEATURE_ASYNC_DESTROY
)) {
1481 ASSERT(scn
->scn_async_destroying
);
1482 scn
->scn_is_bptree
= B_TRUE
;
1483 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1484 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1485 err
= bptree_iterate(dp
->dp_meta_objset
,
1486 dp
->dp_bptree_obj
, B_TRUE
, dsl_scan_free_block_cb
, scn
, tx
);
1487 VERIFY0(zio_wait(scn
->scn_zio_root
));
1489 if (err
== EIO
|| err
== ECKSUM
) {
1491 } else if (err
!= 0 && err
!= ERESTART
) {
1492 zfs_panic_recover("error %u from "
1493 "traverse_dataset_destroyed()", err
);
1496 if (bptree_is_empty(dp
->dp_meta_objset
, dp
->dp_bptree_obj
)) {
1497 /* finished; deactivate async destroy feature */
1498 spa_feature_decr(spa
, SPA_FEATURE_ASYNC_DESTROY
, tx
);
1499 ASSERT(!spa_feature_is_active(spa
,
1500 SPA_FEATURE_ASYNC_DESTROY
));
1501 VERIFY0(zap_remove(dp
->dp_meta_objset
,
1502 DMU_POOL_DIRECTORY_OBJECT
,
1503 DMU_POOL_BPTREE_OBJ
, tx
));
1504 VERIFY0(bptree_free(dp
->dp_meta_objset
,
1505 dp
->dp_bptree_obj
, tx
));
1506 dp
->dp_bptree_obj
= 0;
1507 scn
->scn_async_destroying
= B_FALSE
;
1510 * If we didn't make progress, mark the async destroy as
1511 * stalled, so that we will not initiate a spa_sync() on
1514 scn
->scn_async_stalled
=
1515 (scn
->scn_visited_this_txg
== 0);
1518 if (scn
->scn_visited_this_txg
) {
1519 zfs_dbgmsg("freed %llu blocks in %llums from "
1520 "free_bpobj/bptree txg %llu; err=%u",
1521 (longlong_t
)scn
->scn_visited_this_txg
,
1523 NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
),
1524 (longlong_t
)tx
->tx_txg
, err
);
1525 scn
->scn_visited_this_txg
= 0;
1528 * Write out changes to the DDT that may be required as a
1529 * result of the blocks freed. This ensures that the DDT
1530 * is clean when a scrub/resilver runs.
1532 ddt_sync(spa
, tx
->tx_txg
);
1536 if (!scn
->scn_async_destroying
&& zfs_free_leak_on_eio
&&
1537 (dp
->dp_free_dir
->dd_phys
->dd_used_bytes
!= 0 ||
1538 dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
!= 0 ||
1539 dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
!= 0)) {
1541 * We have finished background destroying, but there is still
1542 * some space left in the dp_free_dir. Transfer this leaked
1543 * space to the dp_leak_dir.
1545 if (dp
->dp_leak_dir
== NULL
) {
1546 rrw_enter(&dp
->dp_config_rwlock
, RW_WRITER
, FTAG
);
1547 (void) dsl_dir_create_sync(dp
, dp
->dp_root_dir
,
1549 VERIFY0(dsl_pool_open_special_dir(dp
,
1550 LEAK_DIR_NAME
, &dp
->dp_leak_dir
));
1551 rrw_exit(&dp
->dp_config_rwlock
, FTAG
);
1553 dsl_dir_diduse_space(dp
->dp_leak_dir
, DD_USED_HEAD
,
1554 dp
->dp_free_dir
->dd_phys
->dd_used_bytes
,
1555 dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
,
1556 dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
, tx
);
1557 dsl_dir_diduse_space(dp
->dp_free_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
);
1562 if (!scn
->scn_async_destroying
) {
1563 /* finished; verify that space accounting went to zero */
1564 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_used_bytes
);
1565 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_compressed_bytes
);
1566 ASSERT0(dp
->dp_free_dir
->dd_phys
->dd_uncompressed_bytes
);
1569 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1572 if (scn
->scn_done_txg
== tx
->tx_txg
) {
1573 ASSERT(!scn
->scn_pausing
);
1574 /* finished with scan. */
1575 zfs_dbgmsg("txg %llu scan complete", tx
->tx_txg
);
1576 dsl_scan_done(scn
, B_TRUE
, tx
);
1577 ASSERT3U(spa
->spa_scrub_inflight
, ==, 0);
1578 dsl_scan_sync_state(scn
, tx
);
1582 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1583 scn
->scn_phys
.scn_ddt_class_max
) {
1584 zfs_dbgmsg("doing scan sync txg %llu; "
1585 "ddt bm=%llu/%llu/%llu/%llx",
1586 (longlong_t
)tx
->tx_txg
,
1587 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
1588 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
1589 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
1590 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
1591 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_objset
== 0);
1592 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_object
== 0);
1593 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_level
== 0);
1594 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_blkid
== 0);
1596 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1597 (longlong_t
)tx
->tx_txg
,
1598 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_objset
,
1599 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_object
,
1600 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_level
,
1601 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_blkid
);
1604 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1605 NULL
, ZIO_FLAG_CANFAIL
);
1606 dsl_pool_config_enter(dp
, FTAG
);
1607 dsl_scan_visit(scn
, tx
);
1608 dsl_pool_config_exit(dp
, FTAG
);
1609 (void) zio_wait(scn
->scn_zio_root
);
1610 scn
->scn_zio_root
= NULL
;
1612 zfs_dbgmsg("visited %llu blocks in %llums",
1613 (longlong_t
)scn
->scn_visited_this_txg
,
1614 (longlong_t
)NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
));
1616 if (!scn
->scn_pausing
) {
1617 scn
->scn_done_txg
= tx
->tx_txg
+ 1;
1618 zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
1619 tx
->tx_txg
, scn
->scn_done_txg
);
1622 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
1623 mutex_enter(&spa
->spa_scrub_lock
);
1624 while (spa
->spa_scrub_inflight
> 0) {
1625 cv_wait(&spa
->spa_scrub_io_cv
,
1626 &spa
->spa_scrub_lock
);
1628 mutex_exit(&spa
->spa_scrub_lock
);
1631 dsl_scan_sync_state(scn
, tx
);
1635 * This will start a new scan, or restart an existing one.
1638 dsl_resilver_restart(dsl_pool_t
*dp
, uint64_t txg
)
1642 tx
= dmu_tx_create_dd(dp
->dp_mos_dir
);
1643 VERIFY(0 == dmu_tx_assign(tx
, TXG_WAIT
));
1645 txg
= dmu_tx_get_txg(tx
);
1646 dp
->dp_scan
->scn_restart_txg
= txg
;
1649 dp
->dp_scan
->scn_restart_txg
= txg
;
1651 zfs_dbgmsg("restarting resilver txg=%llu", txg
);
1655 dsl_scan_resilvering(dsl_pool_t
*dp
)
1657 return (dp
->dp_scan
->scn_phys
.scn_state
== DSS_SCANNING
&&
1658 dp
->dp_scan
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
);
1666 count_block(zfs_all_blkstats_t
*zab
, const blkptr_t
*bp
)
1671 * If we resume after a reboot, zab will be NULL; don't record
1672 * incomplete stats in that case.
1677 for (i
= 0; i
< 4; i
++) {
1678 int l
= (i
< 2) ? BP_GET_LEVEL(bp
) : DN_MAX_LEVELS
;
1679 int t
= (i
& 1) ? BP_GET_TYPE(bp
) : DMU_OT_TOTAL
;
1683 if (t
& DMU_OT_NEWTYPE
)
1686 zb
= &zab
->zab_type
[l
][t
];
1688 zb
->zb_asize
+= BP_GET_ASIZE(bp
);
1689 zb
->zb_lsize
+= BP_GET_LSIZE(bp
);
1690 zb
->zb_psize
+= BP_GET_PSIZE(bp
);
1691 zb
->zb_gangs
+= BP_COUNT_GANG(bp
);
1693 switch (BP_GET_NDVAS(bp
)) {
1695 if (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1696 DVA_GET_VDEV(&bp
->blk_dva
[1]))
1697 zb
->zb_ditto_2_of_2_samevdev
++;
1700 equal
= (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1701 DVA_GET_VDEV(&bp
->blk_dva
[1])) +
1702 (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1703 DVA_GET_VDEV(&bp
->blk_dva
[2])) +
1704 (DVA_GET_VDEV(&bp
->blk_dva
[1]) ==
1705 DVA_GET_VDEV(&bp
->blk_dva
[2]));
1707 zb
->zb_ditto_2_of_3_samevdev
++;
1708 else if (equal
== 3)
1709 zb
->zb_ditto_3_of_3_samevdev
++;
1716 dsl_scan_scrub_done(zio_t
*zio
)
1718 spa_t
*spa
= zio
->io_spa
;
1720 zio_data_buf_free(zio
->io_data
, zio
->io_size
);
1722 mutex_enter(&spa
->spa_scrub_lock
);
1723 spa
->spa_scrub_inflight
--;
1724 cv_broadcast(&spa
->spa_scrub_io_cv
);
1726 if (zio
->io_error
&& (zio
->io_error
!= ECKSUM
||
1727 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
))) {
1728 spa
->spa_dsl_pool
->dp_scan
->scn_phys
.scn_errors
++;
1730 mutex_exit(&spa
->spa_scrub_lock
);
1734 dsl_scan_scrub_cb(dsl_pool_t
*dp
,
1735 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
1737 dsl_scan_t
*scn
= dp
->dp_scan
;
1738 size_t size
= BP_GET_PSIZE(bp
);
1739 spa_t
*spa
= dp
->dp_spa
;
1740 uint64_t phys_birth
= BP_PHYSICAL_BIRTH(bp
);
1741 boolean_t needs_io
= B_FALSE
;
1742 int zio_flags
= ZIO_FLAG_SCAN_THREAD
| ZIO_FLAG_RAW
| ZIO_FLAG_CANFAIL
;
1746 if (phys_birth
<= scn
->scn_phys
.scn_min_txg
||
1747 phys_birth
>= scn
->scn_phys
.scn_max_txg
)
1750 count_block(dp
->dp_blkstats
, bp
);
1752 if (BP_IS_EMBEDDED(bp
))
1755 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn
));
1756 if (scn
->scn_phys
.scn_func
== POOL_SCAN_SCRUB
) {
1757 zio_flags
|= ZIO_FLAG_SCRUB
;
1759 scan_delay
= zfs_scrub_delay
;
1761 ASSERT3U(scn
->scn_phys
.scn_func
, ==, POOL_SCAN_RESILVER
);
1762 zio_flags
|= ZIO_FLAG_RESILVER
;
1764 scan_delay
= zfs_resilver_delay
;
1767 /* If it's an intent log block, failure is expected. */
1768 if (zb
->zb_level
== ZB_ZIL_LEVEL
)
1769 zio_flags
|= ZIO_FLAG_SPECULATIVE
;
1771 for (d
= 0; d
< BP_GET_NDVAS(bp
); d
++) {
1772 vdev_t
*vd
= vdev_lookup_top(spa
,
1773 DVA_GET_VDEV(&bp
->blk_dva
[d
]));
1776 * Keep track of how much data we've examined so that
1777 * zpool(1M) status can make useful progress reports.
1779 scn
->scn_phys
.scn_examined
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1780 spa
->spa_scan_pass_exam
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1782 /* if it's a resilver, this may not be in the target range */
1784 if (DVA_GET_GANG(&bp
->blk_dva
[d
])) {
1786 * Gang members may be spread across multiple
1787 * vdevs, so the best estimate we have is the
1788 * scrub range, which has already been checked.
1789 * XXX -- it would be better to change our
1790 * allocation policy to ensure that all
1791 * gang members reside on the same vdev.
1795 needs_io
= vdev_dtl_contains(vd
, DTL_PARTIAL
,
1801 if (needs_io
&& !zfs_no_scrub_io
) {
1802 vdev_t
*rvd
= spa
->spa_root_vdev
;
1803 uint64_t maxinflight
= rvd
->vdev_children
* zfs_top_maxinflight
;
1804 void *data
= zio_data_buf_alloc(size
);
1806 mutex_enter(&spa
->spa_scrub_lock
);
1807 while (spa
->spa_scrub_inflight
>= maxinflight
)
1808 cv_wait(&spa
->spa_scrub_io_cv
, &spa
->spa_scrub_lock
);
1809 spa
->spa_scrub_inflight
++;
1810 mutex_exit(&spa
->spa_scrub_lock
);
1813 * If we're seeing recent (zfs_scan_idle) "important" I/Os
1814 * then throttle our workload to limit the impact of a scan.
1816 if (ddi_get_lbolt64() - spa
->spa_last_io
<= zfs_scan_idle
)
1819 zio_nowait(zio_read(NULL
, spa
, bp
, data
, size
,
1820 dsl_scan_scrub_done
, NULL
, ZIO_PRIORITY_SCRUB
,
1824 /* do not relocate this block */
1829 dsl_scan(dsl_pool_t
*dp
, pool_scan_func_t func
)
1831 spa_t
*spa
= dp
->dp_spa
;
1834 * Purge all vdev caches and probe all devices. We do this here
1835 * rather than in sync context because this requires a writer lock
1836 * on the spa_config lock, which we can't do from sync context. The
1837 * spa_scrub_reopen flag indicates that vdev_open() should not
1838 * attempt to start another scrub.
1840 spa_vdev_state_enter(spa
, SCL_NONE
);
1841 spa
->spa_scrub_reopen
= B_TRUE
;
1842 vdev_reopen(spa
->spa_root_vdev
);
1843 spa
->spa_scrub_reopen
= B_FALSE
;
1844 (void) spa_vdev_state_exit(spa
, NULL
, 0);
1846 return (dsl_sync_task(spa_name(spa
), dsl_scan_setup_check
,
1847 dsl_scan_setup_sync
, &func
, 0));
1850 #if defined(_KERNEL) && defined(HAVE_SPL)
1851 module_param(zfs_top_maxinflight
, int, 0644);
1852 MODULE_PARM_DESC(zfs_top_maxinflight
, "Max I/Os per top-level");
1854 module_param(zfs_resilver_delay
, int, 0644);
1855 MODULE_PARM_DESC(zfs_resilver_delay
, "Number of ticks to delay resilver");
1857 module_param(zfs_scrub_delay
, int, 0644);
1858 MODULE_PARM_DESC(zfs_scrub_delay
, "Number of ticks to delay scrub");
1860 module_param(zfs_scan_idle
, int, 0644);
1861 MODULE_PARM_DESC(zfs_scan_idle
, "Idle window in clock ticks");
1863 module_param(zfs_scan_min_time_ms
, int, 0644);
1864 MODULE_PARM_DESC(zfs_scan_min_time_ms
, "Min millisecs to scrub per txg");
1866 module_param(zfs_free_min_time_ms
, int, 0644);
1867 MODULE_PARM_DESC(zfs_free_min_time_ms
, "Min millisecs to free per txg");
1869 module_param(zfs_resilver_min_time_ms
, int, 0644);
1870 MODULE_PARM_DESC(zfs_resilver_min_time_ms
, "Min millisecs to resilver per txg");
1872 module_param(zfs_no_scrub_io
, int, 0644);
1873 MODULE_PARM_DESC(zfs_no_scrub_io
, "Set to disable scrub I/O");
1875 module_param(zfs_no_scrub_prefetch
, int, 0644);
1876 MODULE_PARM_DESC(zfs_no_scrub_prefetch
, "Set to disable scrub prefetching");
1878 module_param(zfs_free_max_blocks
, ulong
, 0644);
1879 MODULE_PARM_DESC(zfs_free_max_blocks
, "Max number of blocks freed in one txg");