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, 2015 by Delphix. All rights reserved.
24 * Copyright 2016 Gary Mills
27 #include <sys/dsl_scan.h>
28 #include <sys/dsl_pool.h>
29 #include <sys/dsl_dataset.h>
30 #include <sys/dsl_prop.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_synctask.h>
33 #include <sys/dnode.h>
34 #include <sys/dmu_tx.h>
35 #include <sys/dmu_objset.h>
39 #include <sys/zfs_context.h>
40 #include <sys/fs/zfs.h>
41 #include <sys/zfs_znode.h>
42 #include <sys/spa_impl.h>
43 #include <sys/vdev_impl.h>
44 #include <sys/zil_impl.h>
45 #include <sys/zio_checksum.h>
48 #include <sys/sa_impl.h>
49 #include <sys/zfeature.h>
51 #include <sys/zfs_vfsops.h>
54 typedef int (scan_cb_t
)(dsl_pool_t
*, const blkptr_t
*,
55 const zbookmark_phys_t
*);
57 static scan_cb_t dsl_scan_scrub_cb
;
58 static void dsl_scan_cancel_sync(void *, dmu_tx_t
*);
59 static void dsl_scan_sync_state(dsl_scan_t
*, dmu_tx_t
*);
60 static boolean_t
dsl_scan_restarting(dsl_scan_t
*, dmu_tx_t
*);
62 int zfs_top_maxinflight
= 32; /* maximum I/Os per top-level */
63 int zfs_resilver_delay
= 2; /* number of ticks to delay resilver */
64 int zfs_scrub_delay
= 4; /* number of ticks to delay scrub */
65 int zfs_scan_idle
= 50; /* idle window in clock ticks */
67 int zfs_scan_min_time_ms
= 1000; /* min millisecs to scrub per txg */
68 int zfs_free_min_time_ms
= 1000; /* min millisecs to free per txg */
69 int zfs_resilver_min_time_ms
= 3000; /* min millisecs to resilver per txg */
70 int zfs_no_scrub_io
= B_FALSE
; /* set to disable scrub i/o */
71 int zfs_no_scrub_prefetch
= B_FALSE
; /* set to disable scrub prefetch */
72 enum ddt_class zfs_scrub_ddt_class_max
= DDT_CLASS_DUPLICATE
;
73 int dsl_scan_delay_completion
= B_FALSE
; /* set to delay scan completion */
74 /* max number of blocks to free in a single TXG */
75 ulong zfs_free_max_blocks
= 100000;
77 #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
78 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
79 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
82 * Enable/disable the processing of the free_bpobj object.
84 int zfs_free_bpobj_enabled
= 1;
86 /* the order has to match pool_scan_type */
87 static scan_cb_t
*scan_funcs
[POOL_SCAN_FUNCS
] = {
89 dsl_scan_scrub_cb
, /* POOL_SCAN_SCRUB */
90 dsl_scan_scrub_cb
, /* POOL_SCAN_RESILVER */
94 dsl_scan_init(dsl_pool_t
*dp
, uint64_t txg
)
98 spa_t
*spa
= dp
->dp_spa
;
101 scn
= dp
->dp_scan
= kmem_zalloc(sizeof (dsl_scan_t
), KM_SLEEP
);
105 * It's possible that we're resuming a scan after a reboot so
106 * make sure that the scan_async_destroying flag is initialized
109 ASSERT(!scn
->scn_async_destroying
);
110 scn
->scn_async_destroying
= spa_feature_is_active(dp
->dp_spa
,
111 SPA_FEATURE_ASYNC_DESTROY
);
113 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
114 "scrub_func", sizeof (uint64_t), 1, &f
);
117 * There was an old-style scrub in progress. Restart a
118 * new-style scrub from the beginning.
120 scn
->scn_restart_txg
= txg
;
121 zfs_dbgmsg("old-style scrub was in progress; "
122 "restarting new-style scrub in txg %llu",
123 scn
->scn_restart_txg
);
126 * Load the queue obj from the old location so that it
127 * can be freed by dsl_scan_done().
129 (void) zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
130 "scrub_queue", sizeof (uint64_t), 1,
131 &scn
->scn_phys
.scn_queue_obj
);
133 err
= zap_lookup(dp
->dp_meta_objset
, DMU_POOL_DIRECTORY_OBJECT
,
134 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
137 * Detect if the pool contains the signature of #2094. If it
138 * does properly update the scn->scn_phys structure and notify
139 * the administrator by setting an errata for the pool.
141 if (err
== EOVERFLOW
) {
142 uint64_t zaptmp
[SCAN_PHYS_NUMINTS
+ 1];
143 VERIFY3S(SCAN_PHYS_NUMINTS
, ==, 24);
144 VERIFY3S(offsetof(dsl_scan_phys_t
, scn_flags
), ==,
145 (23 * sizeof (uint64_t)));
147 err
= zap_lookup(dp
->dp_meta_objset
,
148 DMU_POOL_DIRECTORY_OBJECT
, DMU_POOL_SCAN
,
149 sizeof (uint64_t), SCAN_PHYS_NUMINTS
+ 1, &zaptmp
);
151 uint64_t overflow
= zaptmp
[SCAN_PHYS_NUMINTS
];
153 if (overflow
& ~DSL_SCAN_FLAGS_MASK
||
154 scn
->scn_async_destroying
) {
156 ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY
;
160 bcopy(zaptmp
, &scn
->scn_phys
,
161 SCAN_PHYS_NUMINTS
* sizeof (uint64_t));
162 scn
->scn_phys
.scn_flags
= overflow
;
164 /* Required scrub already in progress. */
165 if (scn
->scn_phys
.scn_state
== DSS_FINISHED
||
166 scn
->scn_phys
.scn_state
== DSS_CANCELED
)
168 ZPOOL_ERRATA_ZOL_2094_SCRUB
;
177 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
&&
178 spa_prev_software_version(dp
->dp_spa
) < SPA_VERSION_SCAN
) {
180 * A new-type scrub was in progress on an old
181 * pool, and the pool was accessed by old
182 * software. Restart from the beginning, since
183 * the old software may have changed the pool in
186 scn
->scn_restart_txg
= txg
;
187 zfs_dbgmsg("new-style scrub was modified "
188 "by old software; restarting in txg %llu",
189 scn
->scn_restart_txg
);
193 spa_scan_stat_init(spa
);
198 dsl_scan_fini(dsl_pool_t
*dp
)
201 kmem_free(dp
->dp_scan
, sizeof (dsl_scan_t
));
208 dsl_scan_setup_check(void *arg
, dmu_tx_t
*tx
)
210 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
212 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
)
213 return (SET_ERROR(EBUSY
));
219 dsl_scan_setup_sync(void *arg
, dmu_tx_t
*tx
)
221 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
222 pool_scan_func_t
*funcp
= arg
;
223 dmu_object_type_t ot
= 0;
224 dsl_pool_t
*dp
= scn
->scn_dp
;
225 spa_t
*spa
= dp
->dp_spa
;
227 ASSERT(scn
->scn_phys
.scn_state
!= DSS_SCANNING
);
228 ASSERT(*funcp
> POOL_SCAN_NONE
&& *funcp
< POOL_SCAN_FUNCS
);
229 bzero(&scn
->scn_phys
, sizeof (scn
->scn_phys
));
230 scn
->scn_phys
.scn_func
= *funcp
;
231 scn
->scn_phys
.scn_state
= DSS_SCANNING
;
232 scn
->scn_phys
.scn_min_txg
= 0;
233 scn
->scn_phys
.scn_max_txg
= tx
->tx_txg
;
234 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASSES
- 1; /* the entire DDT */
235 scn
->scn_phys
.scn_start_time
= gethrestime_sec();
236 scn
->scn_phys
.scn_errors
= 0;
237 scn
->scn_phys
.scn_to_examine
= spa
->spa_root_vdev
->vdev_stat
.vs_alloc
;
238 scn
->scn_restart_txg
= 0;
239 scn
->scn_done_txg
= 0;
240 spa_scan_stat_init(spa
);
242 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
243 scn
->scn_phys
.scn_ddt_class_max
= zfs_scrub_ddt_class_max
;
245 /* rewrite all disk labels */
246 vdev_config_dirty(spa
->spa_root_vdev
);
248 if (vdev_resilver_needed(spa
->spa_root_vdev
,
249 &scn
->scn_phys
.scn_min_txg
, &scn
->scn_phys
.scn_max_txg
)) {
250 spa_event_notify(spa
, NULL
,
251 FM_EREPORT_ZFS_RESILVER_START
);
253 spa_event_notify(spa
, NULL
,
254 FM_EREPORT_ZFS_SCRUB_START
);
257 spa
->spa_scrub_started
= B_TRUE
;
259 * If this is an incremental scrub, limit the DDT scrub phase
260 * to just the auto-ditto class (for correctness); the rest
261 * of the scrub should go faster using top-down pruning.
263 if (scn
->scn_phys
.scn_min_txg
> TXG_INITIAL
)
264 scn
->scn_phys
.scn_ddt_class_max
= DDT_CLASS_DITTO
;
268 /* back to the generic stuff */
270 if (dp
->dp_blkstats
== NULL
) {
272 vmem_alloc(sizeof (zfs_all_blkstats_t
), KM_SLEEP
);
274 bzero(dp
->dp_blkstats
, sizeof (zfs_all_blkstats_t
));
276 if (spa_version(spa
) < SPA_VERSION_DSL_SCRUB
)
277 ot
= DMU_OT_ZAP_OTHER
;
279 scn
->scn_phys
.scn_queue_obj
= zap_create(dp
->dp_meta_objset
,
280 ot
? ot
: DMU_OT_SCAN_QUEUE
, DMU_OT_NONE
, 0, tx
);
282 dsl_scan_sync_state(scn
, tx
);
284 spa_history_log_internal(spa
, "scan setup", tx
,
285 "func=%u mintxg=%llu maxtxg=%llu",
286 *funcp
, scn
->scn_phys
.scn_min_txg
, scn
->scn_phys
.scn_max_txg
);
291 dsl_scan_done(dsl_scan_t
*scn
, boolean_t complete
, dmu_tx_t
*tx
)
293 static const char *old_names
[] = {
295 "scrub_ddt_bookmark",
296 "scrub_ddt_class_max",
305 dsl_pool_t
*dp
= scn
->scn_dp
;
306 spa_t
*spa
= dp
->dp_spa
;
309 /* Remove any remnants of an old-style scrub. */
310 for (i
= 0; old_names
[i
]; i
++) {
311 (void) zap_remove(dp
->dp_meta_objset
,
312 DMU_POOL_DIRECTORY_OBJECT
, old_names
[i
], tx
);
315 if (scn
->scn_phys
.scn_queue_obj
!= 0) {
316 VERIFY(0 == dmu_object_free(dp
->dp_meta_objset
,
317 scn
->scn_phys
.scn_queue_obj
, tx
));
318 scn
->scn_phys
.scn_queue_obj
= 0;
322 * If we were "restarted" from a stopped state, don't bother
323 * with anything else.
325 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
329 scn
->scn_phys
.scn_state
= DSS_FINISHED
;
331 scn
->scn_phys
.scn_state
= DSS_CANCELED
;
333 if (dsl_scan_restarting(scn
, tx
))
334 spa_history_log_internal(spa
, "scan aborted, restarting", tx
,
335 "errors=%llu", spa_get_errlog_size(spa
));
337 spa_history_log_internal(spa
, "scan cancelled", tx
,
338 "errors=%llu", spa_get_errlog_size(spa
));
340 spa_history_log_internal(spa
, "scan done", tx
,
341 "errors=%llu", spa_get_errlog_size(spa
));
343 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
344 mutex_enter(&spa
->spa_scrub_lock
);
345 while (spa
->spa_scrub_inflight
> 0) {
346 cv_wait(&spa
->spa_scrub_io_cv
,
347 &spa
->spa_scrub_lock
);
349 mutex_exit(&spa
->spa_scrub_lock
);
350 spa
->spa_scrub_started
= B_FALSE
;
351 spa
->spa_scrub_active
= B_FALSE
;
354 * If the scrub/resilver completed, update all DTLs to
355 * reflect this. Whether it succeeded or not, vacate
356 * all temporary scrub DTLs.
358 vdev_dtl_reassess(spa
->spa_root_vdev
, tx
->tx_txg
,
359 complete
? scn
->scn_phys
.scn_max_txg
: 0, B_TRUE
);
361 spa_event_notify(spa
, NULL
, scn
->scn_phys
.scn_min_txg
?
362 FM_EREPORT_ZFS_RESILVER_FINISH
:
363 FM_EREPORT_ZFS_SCRUB_FINISH
);
365 spa_errlog_rotate(spa
);
368 * We may have finished replacing a device.
369 * Let the async thread assess this and handle the detach.
371 spa_async_request(spa
, SPA_ASYNC_RESILVER_DONE
);
374 scn
->scn_phys
.scn_end_time
= gethrestime_sec();
376 if (spa
->spa_errata
== ZPOOL_ERRATA_ZOL_2094_SCRUB
)
382 dsl_scan_cancel_check(void *arg
, dmu_tx_t
*tx
)
384 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
386 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
387 return (SET_ERROR(ENOENT
));
393 dsl_scan_cancel_sync(void *arg
, dmu_tx_t
*tx
)
395 dsl_scan_t
*scn
= dmu_tx_pool(tx
)->dp_scan
;
397 dsl_scan_done(scn
, B_FALSE
, tx
);
398 dsl_scan_sync_state(scn
, tx
);
402 dsl_scan_cancel(dsl_pool_t
*dp
)
404 return (dsl_sync_task(spa_name(dp
->dp_spa
), dsl_scan_cancel_check
,
405 dsl_scan_cancel_sync
, NULL
, 3, ZFS_SPACE_CHECK_RESERVED
));
408 static void dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
409 dnode_phys_t
*dnp
, dsl_dataset_t
*ds
, dsl_scan_t
*scn
,
410 dmu_objset_type_t ostype
, dmu_tx_t
*tx
);
411 inline __attribute__((always_inline
)) static void dsl_scan_visitdnode(
412 dsl_scan_t
*, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
413 dnode_phys_t
*dnp
, uint64_t object
, dmu_tx_t
*tx
);
416 dsl_free(dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bp
)
418 zio_free(dp
->dp_spa
, txg
, bp
);
422 dsl_free_sync(zio_t
*pio
, dsl_pool_t
*dp
, uint64_t txg
, const blkptr_t
*bpp
)
424 ASSERT(dsl_pool_sync_context(dp
));
425 zio_nowait(zio_free_sync(pio
, dp
->dp_spa
, txg
, bpp
, pio
->io_flags
));
429 dsl_scan_ds_maxtxg(dsl_dataset_t
*ds
)
431 uint64_t smt
= ds
->ds_dir
->dd_pool
->dp_scan
->scn_phys
.scn_max_txg
;
432 if (ds
->ds_is_snapshot
)
433 return (MIN(smt
, dsl_dataset_phys(ds
)->ds_creation_txg
));
438 dsl_scan_sync_state(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
440 VERIFY0(zap_update(scn
->scn_dp
->dp_meta_objset
,
441 DMU_POOL_DIRECTORY_OBJECT
,
442 DMU_POOL_SCAN
, sizeof (uint64_t), SCAN_PHYS_NUMINTS
,
443 &scn
->scn_phys
, tx
));
446 extern int zfs_vdev_async_write_active_min_dirty_percent
;
449 dsl_scan_check_pause(dsl_scan_t
*scn
, const zbookmark_phys_t
*zb
)
451 uint64_t elapsed_nanosecs
;
455 /* we never skip user/group accounting objects */
456 if (zb
&& (int64_t)zb
->zb_object
< 0)
459 if (scn
->scn_pausing
)
460 return (B_TRUE
); /* we're already pausing */
462 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
))
463 return (B_FALSE
); /* we're resuming */
465 /* We only know how to resume from level-0 blocks. */
466 if (zb
&& zb
->zb_level
!= 0)
471 * - we have scanned for the maximum time: an entire txg
472 * timeout (default 5 sec)
474 * - we have scanned for at least the minimum time (default 1 sec
475 * for scrub, 3 sec for resilver), and either we have sufficient
476 * dirty data that we are starting to write more quickly
477 * (default 30%), or someone is explicitly waiting for this txg
480 * - the spa is shutting down because this pool is being exported
481 * or the machine is rebooting.
483 mintime
= (scn
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
) ?
484 zfs_resilver_min_time_ms
: zfs_scan_min_time_ms
;
485 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
486 dirty_pct
= scn
->scn_dp
->dp_dirty_total
* 100 / zfs_dirty_data_max
;
487 if (elapsed_nanosecs
/ NANOSEC
>= zfs_txg_timeout
||
488 (NSEC2MSEC(elapsed_nanosecs
) > mintime
&&
489 (txg_sync_waiting(scn
->scn_dp
) ||
490 dirty_pct
>= zfs_vdev_async_write_active_min_dirty_percent
)) ||
491 spa_shutting_down(scn
->scn_dp
->dp_spa
)) {
493 dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n",
494 (longlong_t
)zb
->zb_objset
,
495 (longlong_t
)zb
->zb_object
,
496 (longlong_t
)zb
->zb_level
,
497 (longlong_t
)zb
->zb_blkid
);
498 scn
->scn_phys
.scn_bookmark
= *zb
;
500 dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n",
501 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
502 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
503 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
504 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
505 scn
->scn_pausing
= B_TRUE
;
511 typedef struct zil_scan_arg
{
513 zil_header_t
*zsa_zh
;
518 dsl_scan_zil_block(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
520 zil_scan_arg_t
*zsa
= arg
;
521 dsl_pool_t
*dp
= zsa
->zsa_dp
;
522 dsl_scan_t
*scn
= dp
->dp_scan
;
523 zil_header_t
*zh
= zsa
->zsa_zh
;
526 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
530 * One block ("stubby") can be allocated a long time ago; we
531 * want to visit that one because it has been allocated
532 * (on-disk) even if it hasn't been claimed (even though for
533 * scrub there's nothing to do to it).
535 if (claim_txg
== 0 && bp
->blk_birth
>= spa_first_txg(dp
->dp_spa
))
538 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
539 ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
, bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
541 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
547 dsl_scan_zil_record(zilog_t
*zilog
, lr_t
*lrc
, void *arg
, uint64_t claim_txg
)
549 if (lrc
->lrc_txtype
== TX_WRITE
) {
550 zil_scan_arg_t
*zsa
= arg
;
551 dsl_pool_t
*dp
= zsa
->zsa_dp
;
552 dsl_scan_t
*scn
= dp
->dp_scan
;
553 zil_header_t
*zh
= zsa
->zsa_zh
;
554 lr_write_t
*lr
= (lr_write_t
*)lrc
;
555 blkptr_t
*bp
= &lr
->lr_blkptr
;
558 if (BP_IS_HOLE(bp
) ||
559 bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
563 * birth can be < claim_txg if this record's txg is
564 * already txg sync'ed (but this log block contains
565 * other records that are not synced)
567 if (claim_txg
== 0 || bp
->blk_birth
< claim_txg
)
570 SET_BOOKMARK(&zb
, zh
->zh_log
.blk_cksum
.zc_word
[ZIL_ZC_OBJSET
],
571 lr
->lr_foid
, ZB_ZIL_LEVEL
,
572 lr
->lr_offset
/ BP_GET_LSIZE(bp
));
574 VERIFY(0 == scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, &zb
));
580 dsl_scan_zil(dsl_pool_t
*dp
, zil_header_t
*zh
)
582 uint64_t claim_txg
= zh
->zh_claim_txg
;
583 zil_scan_arg_t zsa
= { dp
, zh
};
587 * We only want to visit blocks that have been claimed but not yet
588 * replayed (or, in read-only mode, blocks that *would* be claimed).
590 if (claim_txg
== 0 && spa_writeable(dp
->dp_spa
))
593 zilog
= zil_alloc(dp
->dp_meta_objset
, zh
);
595 (void) zil_parse(zilog
, dsl_scan_zil_block
, dsl_scan_zil_record
, &zsa
,
603 dsl_scan_prefetch(dsl_scan_t
*scn
, arc_buf_t
*buf
, blkptr_t
*bp
,
604 uint64_t objset
, uint64_t object
, uint64_t blkid
)
606 zbookmark_phys_t czb
;
607 arc_flags_t flags
= ARC_FLAG_NOWAIT
| ARC_FLAG_PREFETCH
;
609 if (zfs_no_scrub_prefetch
)
612 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= scn
->scn_phys
.scn_min_txg
||
613 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_DNODE
))
616 SET_BOOKMARK(&czb
, objset
, object
, BP_GET_LEVEL(bp
), blkid
);
618 (void) arc_read(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
, bp
,
619 NULL
, NULL
, ZIO_PRIORITY_ASYNC_READ
,
620 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
, &flags
, &czb
);
624 dsl_scan_check_resume(dsl_scan_t
*scn
, const dnode_phys_t
*dnp
,
625 const zbookmark_phys_t
*zb
)
628 * We never skip over user/group accounting objects (obj<0)
630 if (!ZB_IS_ZERO(&scn
->scn_phys
.scn_bookmark
) &&
631 (int64_t)zb
->zb_object
>= 0) {
633 * If we already visited this bp & everything below (in
634 * a prior txg sync), don't bother doing it again.
636 if (zbookmark_subtree_completed(dnp
, zb
,
637 &scn
->scn_phys
.scn_bookmark
))
641 * If we found the block we're trying to resume from, or
642 * we went past it to a different object, zero it out to
643 * indicate that it's OK to start checking for pausing
646 if (bcmp(zb
, &scn
->scn_phys
.scn_bookmark
, sizeof (*zb
)) == 0 ||
647 zb
->zb_object
> scn
->scn_phys
.scn_bookmark
.zb_object
) {
648 dprintf("resuming at %llx/%llx/%llx/%llx\n",
649 (longlong_t
)zb
->zb_objset
,
650 (longlong_t
)zb
->zb_object
,
651 (longlong_t
)zb
->zb_level
,
652 (longlong_t
)zb
->zb_blkid
);
653 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (*zb
));
660 * Return nonzero on i/o error.
661 * Return new buf to write out in *bufp.
663 inline __attribute__((always_inline
)) static int
664 dsl_scan_recurse(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, dmu_objset_type_t ostype
,
665 dnode_phys_t
*dnp
, const blkptr_t
*bp
,
666 const zbookmark_phys_t
*zb
, dmu_tx_t
*tx
)
668 dsl_pool_t
*dp
= scn
->scn_dp
;
669 int zio_flags
= ZIO_FLAG_CANFAIL
| ZIO_FLAG_SCAN_THREAD
;
672 if (BP_GET_LEVEL(bp
) > 0) {
673 arc_flags_t flags
= ARC_FLAG_WAIT
;
676 int epb
= BP_GET_LSIZE(bp
) >> SPA_BLKPTRSHIFT
;
679 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
680 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
682 scn
->scn_phys
.scn_errors
++;
685 for (i
= 0, cbp
= buf
->b_data
; i
< epb
; i
++, cbp
++) {
686 dsl_scan_prefetch(scn
, buf
, cbp
, zb
->zb_objset
,
687 zb
->zb_object
, zb
->zb_blkid
* epb
+ i
);
689 for (i
= 0, cbp
= buf
->b_data
; i
< epb
; i
++, cbp
++) {
690 zbookmark_phys_t czb
;
692 SET_BOOKMARK(&czb
, zb
->zb_objset
, zb
->zb_object
,
694 zb
->zb_blkid
* epb
+ i
);
695 dsl_scan_visitbp(cbp
, &czb
, dnp
,
696 ds
, scn
, ostype
, tx
);
698 (void) arc_buf_remove_ref(buf
, &buf
);
699 } else if (BP_GET_TYPE(bp
) == DMU_OT_DNODE
) {
700 arc_flags_t flags
= ARC_FLAG_WAIT
;
703 int epb
= BP_GET_LSIZE(bp
) >> DNODE_SHIFT
;
706 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
707 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
709 scn
->scn_phys
.scn_errors
++;
712 for (i
= 0, cdnp
= buf
->b_data
; i
< epb
;
713 i
+= cdnp
->dn_extra_slots
+ 1,
714 cdnp
+= cdnp
->dn_extra_slots
+ 1) {
715 for (j
= 0; j
< cdnp
->dn_nblkptr
; j
++) {
716 blkptr_t
*cbp
= &cdnp
->dn_blkptr
[j
];
717 dsl_scan_prefetch(scn
, buf
, cbp
,
718 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
, j
);
721 for (i
= 0, cdnp
= buf
->b_data
; i
< epb
;
722 i
+= cdnp
->dn_extra_slots
+ 1,
723 cdnp
+= cdnp
->dn_extra_slots
+ 1) {
724 dsl_scan_visitdnode(scn
, ds
, ostype
,
725 cdnp
, zb
->zb_blkid
* epb
+ i
, tx
);
728 (void) arc_buf_remove_ref(buf
, &buf
);
729 } else if (BP_GET_TYPE(bp
) == DMU_OT_OBJSET
) {
730 arc_flags_t flags
= ARC_FLAG_WAIT
;
734 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
735 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
737 scn
->scn_phys
.scn_errors
++;
743 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
744 &osp
->os_meta_dnode
, DMU_META_DNODE_OBJECT
, tx
);
746 if (OBJSET_BUF_HAS_USERUSED(buf
)) {
748 * We also always visit user/group accounting
749 * objects, and never skip them, even if we are
750 * pausing. This is necessary so that the space
751 * deltas from this txg get integrated.
753 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
754 &osp
->os_groupused_dnode
,
755 DMU_GROUPUSED_OBJECT
, tx
);
756 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
757 &osp
->os_userused_dnode
,
758 DMU_USERUSED_OBJECT
, tx
);
760 (void) arc_buf_remove_ref(buf
, &buf
);
766 inline __attribute__((always_inline
)) static void
767 dsl_scan_visitdnode(dsl_scan_t
*scn
, dsl_dataset_t
*ds
,
768 dmu_objset_type_t ostype
, dnode_phys_t
*dnp
,
769 uint64_t object
, dmu_tx_t
*tx
)
773 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
774 zbookmark_phys_t czb
;
776 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
777 dnp
->dn_nlevels
- 1, j
);
778 dsl_scan_visitbp(&dnp
->dn_blkptr
[j
],
779 &czb
, dnp
, ds
, scn
, ostype
, tx
);
782 if (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
) {
783 zbookmark_phys_t czb
;
784 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
786 dsl_scan_visitbp(DN_SPILL_BLKPTR(dnp
),
787 &czb
, dnp
, ds
, scn
, ostype
, tx
);
792 * The arguments are in this order because mdb can only print the
793 * first 5; we want them to be useful.
796 dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
797 dnode_phys_t
*dnp
, dsl_dataset_t
*ds
, dsl_scan_t
*scn
,
798 dmu_objset_type_t ostype
, dmu_tx_t
*tx
)
800 dsl_pool_t
*dp
= scn
->scn_dp
;
803 bp_toread
= kmem_alloc(sizeof (blkptr_t
), KM_SLEEP
);
806 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
808 if (dsl_scan_check_pause(scn
, zb
))
811 if (dsl_scan_check_resume(scn
, dnp
, zb
))
817 scn
->scn_visited_this_txg
++;
820 * This debugging is commented out to conserve stack space. This
821 * function is called recursively and the debugging addes several
822 * bytes to the stack for each call. It can be commented back in
823 * if required to debug an issue in dsl_scan_visitbp().
826 * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p",
827 * ds, ds ? ds->ds_object : 0,
828 * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
832 if (bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
835 if (dsl_scan_recurse(scn
, ds
, ostype
, dnp
, bp_toread
, zb
, tx
) != 0)
839 * If dsl_scan_ddt() has aready visited this block, it will have
840 * already done any translations or scrubbing, so don't call the
843 if (ddt_class_contains(dp
->dp_spa
,
844 scn
->scn_phys
.scn_ddt_class_max
, bp
)) {
849 * If this block is from the future (after cur_max_txg), then we
850 * are doing this on behalf of a deleted snapshot, and we will
851 * revisit the future block on the next pass of this dataset.
852 * Don't scan it now unless we need to because something
853 * under it was modified.
855 if (BP_PHYSICAL_BIRTH(bp
) <= scn
->scn_phys
.scn_cur_max_txg
) {
856 scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, zb
);
859 kmem_free(bp_toread
, sizeof (blkptr_t
));
863 dsl_scan_visit_rootbp(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, blkptr_t
*bp
,
868 SET_BOOKMARK(&zb
, ds
? ds
->ds_object
: DMU_META_OBJSET
,
869 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
870 dsl_scan_visitbp(bp
, &zb
, NULL
,
871 ds
, scn
, DMU_OST_NONE
, tx
);
873 dprintf_ds(ds
, "finished scan%s", "");
877 dsl_scan_ds_destroyed(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
879 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
880 dsl_scan_t
*scn
= dp
->dp_scan
;
883 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
886 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
887 if (ds
->ds_is_snapshot
) {
890 * - scn_cur_{min,max}_txg stays the same.
891 * - Setting the flag is not really necessary if
892 * scn_cur_max_txg == scn_max_txg, because there
893 * is nothing after this snapshot that we care
894 * about. However, we set it anyway and then
895 * ignore it when we retraverse it in
896 * dsl_scan_visitds().
898 scn
->scn_phys
.scn_bookmark
.zb_objset
=
899 dsl_dataset_phys(ds
)->ds_next_snap_obj
;
900 zfs_dbgmsg("destroying ds %llu; currently traversing; "
901 "reset zb_objset to %llu",
902 (u_longlong_t
)ds
->ds_object
,
903 (u_longlong_t
)dsl_dataset_phys(ds
)->
905 scn
->scn_phys
.scn_flags
|= DSF_VISIT_DS_AGAIN
;
907 SET_BOOKMARK(&scn
->scn_phys
.scn_bookmark
,
908 ZB_DESTROYED_OBJSET
, 0, 0, 0);
909 zfs_dbgmsg("destroying ds %llu; currently traversing; "
910 "reset bookmark to -1,0,0,0",
911 (u_longlong_t
)ds
->ds_object
);
913 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
914 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
915 ASSERT3U(dsl_dataset_phys(ds
)->ds_num_children
, <=, 1);
916 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
917 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
918 if (ds
->ds_is_snapshot
) {
920 * We keep the same mintxg; it could be >
921 * ds_creation_txg if the previous snapshot was
924 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
925 scn
->scn_phys
.scn_queue_obj
,
926 dsl_dataset_phys(ds
)->ds_next_snap_obj
,
928 zfs_dbgmsg("destroying ds %llu; in queue; "
929 "replacing with %llu",
930 (u_longlong_t
)ds
->ds_object
,
931 (u_longlong_t
)dsl_dataset_phys(ds
)->
934 zfs_dbgmsg("destroying ds %llu; in queue; removing",
935 (u_longlong_t
)ds
->ds_object
);
940 * dsl_scan_sync() should be called after this, and should sync
941 * out our changed state, but just to be safe, do it here.
943 dsl_scan_sync_state(scn
, tx
);
947 dsl_scan_ds_snapshotted(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
949 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
950 dsl_scan_t
*scn
= dp
->dp_scan
;
953 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
956 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
958 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
959 scn
->scn_phys
.scn_bookmark
.zb_objset
=
960 dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
961 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
962 "reset zb_objset to %llu",
963 (u_longlong_t
)ds
->ds_object
,
964 (u_longlong_t
)dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
965 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
966 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
967 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
968 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
969 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
970 scn
->scn_phys
.scn_queue_obj
,
971 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, mintxg
, tx
) == 0);
972 zfs_dbgmsg("snapshotting ds %llu; in queue; "
973 "replacing with %llu",
974 (u_longlong_t
)ds
->ds_object
,
975 (u_longlong_t
)dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
977 dsl_scan_sync_state(scn
, tx
);
981 dsl_scan_ds_clone_swapped(dsl_dataset_t
*ds1
, dsl_dataset_t
*ds2
, dmu_tx_t
*tx
)
983 dsl_pool_t
*dp
= ds1
->ds_dir
->dd_pool
;
984 dsl_scan_t
*scn
= dp
->dp_scan
;
987 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
990 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds1
->ds_object
) {
991 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds2
->ds_object
;
992 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
993 "reset zb_objset to %llu",
994 (u_longlong_t
)ds1
->ds_object
,
995 (u_longlong_t
)ds2
->ds_object
);
996 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds2
->ds_object
) {
997 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds1
->ds_object
;
998 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
999 "reset zb_objset to %llu",
1000 (u_longlong_t
)ds2
->ds_object
,
1001 (u_longlong_t
)ds1
->ds_object
);
1004 if (zap_lookup_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1005 ds1
->ds_object
, &mintxg
) == 0) {
1008 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds1
)->ds_prev_snap_txg
);
1009 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds2
)->ds_prev_snap_txg
);
1010 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1011 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, tx
));
1012 err
= zap_add_int_key(dp
->dp_meta_objset
,
1013 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, mintxg
, tx
);
1014 VERIFY(err
== 0 || err
== EEXIST
);
1015 if (err
== EEXIST
) {
1016 /* Both were there to begin with */
1017 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
1018 scn
->scn_phys
.scn_queue_obj
,
1019 ds1
->ds_object
, mintxg
, tx
));
1021 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1022 "replacing with %llu",
1023 (u_longlong_t
)ds1
->ds_object
,
1024 (u_longlong_t
)ds2
->ds_object
);
1025 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
1026 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, &mintxg
) == 0) {
1027 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds1
)->ds_prev_snap_txg
);
1028 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds2
)->ds_prev_snap_txg
);
1029 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1030 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, tx
));
1031 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
1032 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, mintxg
, tx
));
1033 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1034 "replacing with %llu",
1035 (u_longlong_t
)ds2
->ds_object
,
1036 (u_longlong_t
)ds1
->ds_object
);
1039 dsl_scan_sync_state(scn
, tx
);
1042 struct enqueue_clones_arg
{
1049 enqueue_clones_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1051 struct enqueue_clones_arg
*eca
= arg
;
1054 dsl_scan_t
*scn
= dp
->dp_scan
;
1056 if (dsl_dir_phys(hds
->ds_dir
)->dd_origin_obj
!= eca
->originobj
)
1059 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1063 while (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= eca
->originobj
) {
1064 dsl_dataset_t
*prev
;
1065 err
= dsl_dataset_hold_obj(dp
,
1066 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1068 dsl_dataset_rele(ds
, FTAG
);
1073 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1074 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1075 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, eca
->tx
) == 0);
1076 dsl_dataset_rele(ds
, FTAG
);
1081 dsl_scan_visitds(dsl_scan_t
*scn
, uint64_t dsobj
, dmu_tx_t
*tx
)
1083 dsl_pool_t
*dp
= scn
->scn_dp
;
1088 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1090 if (scn
->scn_phys
.scn_cur_min_txg
>=
1091 scn
->scn_phys
.scn_max_txg
) {
1093 * This can happen if this snapshot was created after the
1094 * scan started, and we already completed a previous snapshot
1095 * that was created after the scan started. This snapshot
1096 * only references blocks with:
1098 * birth < our ds_creation_txg
1099 * cur_min_txg is no less than ds_creation_txg.
1100 * We have already visited these blocks.
1102 * birth > scn_max_txg
1103 * The scan requested not to visit these blocks.
1105 * Subsequent snapshots (and clones) can reference our
1106 * blocks, or blocks with even higher birth times.
1107 * Therefore we do not need to visit them either,
1108 * so we do not add them to the work queue.
1110 * Note that checking for cur_min_txg >= cur_max_txg
1111 * is not sufficient, because in that case we may need to
1112 * visit subsequent snapshots. This happens when min_txg > 0,
1113 * which raises cur_min_txg. In this case we will visit
1114 * this dataset but skip all of its blocks, because the
1115 * rootbp's birth time is < cur_min_txg. Then we will
1116 * add the next snapshots/clones to the work queue.
1118 char *dsname
= kmem_alloc(MAXNAMELEN
, KM_SLEEP
);
1119 dsl_dataset_name(ds
, dsname
);
1120 zfs_dbgmsg("scanning dataset %llu (%s) is unnecessary because "
1121 "cur_min_txg (%llu) >= max_txg (%llu)",
1123 scn
->scn_phys
.scn_cur_min_txg
,
1124 scn
->scn_phys
.scn_max_txg
);
1125 kmem_free(dsname
, MAXNAMELEN
);
1130 if (dmu_objset_from_ds(ds
, &os
))
1134 * Only the ZIL in the head (non-snapshot) is valid. Even though
1135 * snapshots can have ZIL block pointers (which may be the same
1136 * BP as in the head), they must be ignored. So we traverse the
1137 * ZIL here, rather than in scan_recurse(), because the regular
1138 * snapshot block-sharing rules don't apply to it.
1140 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
) && !ds
->ds_is_snapshot
)
1141 dsl_scan_zil(dp
, &os
->os_zil_header
);
1144 * Iterate over the bps in this ds.
1146 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1147 dsl_scan_visit_rootbp(scn
, ds
, &dsl_dataset_phys(ds
)->ds_bp
, tx
);
1149 dsname
= kmem_alloc(ZFS_MAXNAMELEN
, KM_SLEEP
);
1150 dsl_dataset_name(ds
, dsname
);
1151 zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; "
1153 (longlong_t
)dsobj
, dsname
,
1154 (longlong_t
)scn
->scn_phys
.scn_cur_min_txg
,
1155 (longlong_t
)scn
->scn_phys
.scn_cur_max_txg
,
1156 (int)scn
->scn_pausing
);
1157 kmem_free(dsname
, ZFS_MAXNAMELEN
);
1159 if (scn
->scn_pausing
)
1163 * We've finished this pass over this dataset.
1167 * If we did not completely visit this dataset, do another pass.
1169 if (scn
->scn_phys
.scn_flags
& DSF_VISIT_DS_AGAIN
) {
1170 zfs_dbgmsg("incomplete pass; visiting again");
1171 scn
->scn_phys
.scn_flags
&= ~DSF_VISIT_DS_AGAIN
;
1172 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1173 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1174 scn
->scn_phys
.scn_cur_max_txg
, tx
) == 0);
1179 * Add descendent datasets to work queue.
1181 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0) {
1182 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1183 scn
->scn_phys
.scn_queue_obj
,
1184 dsl_dataset_phys(ds
)->ds_next_snap_obj
,
1185 dsl_dataset_phys(ds
)->ds_creation_txg
, tx
) == 0);
1187 if (dsl_dataset_phys(ds
)->ds_num_children
> 1) {
1188 boolean_t usenext
= B_FALSE
;
1189 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1192 * A bug in a previous version of the code could
1193 * cause upgrade_clones_cb() to not set
1194 * ds_next_snap_obj when it should, leading to a
1195 * missing entry. Therefore we can only use the
1196 * next_clones_obj when its count is correct.
1198 int err
= zap_count(dp
->dp_meta_objset
,
1199 dsl_dataset_phys(ds
)->ds_next_clones_obj
, &count
);
1201 count
== dsl_dataset_phys(ds
)->ds_num_children
- 1)
1206 VERIFY0(zap_join_key(dp
->dp_meta_objset
,
1207 dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1208 scn
->scn_phys
.scn_queue_obj
,
1209 dsl_dataset_phys(ds
)->ds_creation_txg
, tx
));
1211 struct enqueue_clones_arg eca
;
1213 eca
.originobj
= ds
->ds_object
;
1215 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1216 enqueue_clones_cb
, &eca
, DS_FIND_CHILDREN
));
1221 dsl_dataset_rele(ds
, FTAG
);
1226 enqueue_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1231 dsl_scan_t
*scn
= dp
->dp_scan
;
1233 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1237 while (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1238 dsl_dataset_t
*prev
;
1239 err
= dsl_dataset_hold_obj(dp
,
1240 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1242 dsl_dataset_rele(ds
, FTAG
);
1247 * If this is a clone, we don't need to worry about it for now.
1249 if (dsl_dataset_phys(prev
)->ds_next_snap_obj
!= ds
->ds_object
) {
1250 dsl_dataset_rele(ds
, FTAG
);
1251 dsl_dataset_rele(prev
, FTAG
);
1254 dsl_dataset_rele(ds
, FTAG
);
1258 VERIFY(zap_add_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1259 ds
->ds_object
, dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
) == 0);
1260 dsl_dataset_rele(ds
, FTAG
);
1265 * Scrub/dedup interaction.
1267 * If there are N references to a deduped block, we don't want to scrub it
1268 * N times -- ideally, we should scrub it exactly once.
1270 * We leverage the fact that the dde's replication class (enum ddt_class)
1271 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest
1272 * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order.
1274 * To prevent excess scrubbing, the scrub begins by walking the DDT
1275 * to find all blocks with refcnt > 1, and scrubs each of these once.
1276 * Since there are two replication classes which contain blocks with
1277 * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first.
1278 * Finally the top-down scrub begins, only visiting blocks with refcnt == 1.
1280 * There would be nothing more to say if a block's refcnt couldn't change
1281 * during a scrub, but of course it can so we must account for changes
1282 * in a block's replication class.
1284 * Here's an example of what can occur:
1286 * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1
1287 * when visited during the top-down scrub phase, it will be scrubbed twice.
1288 * This negates our scrub optimization, but is otherwise harmless.
1290 * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1
1291 * on each visit during the top-down scrub phase, it will never be scrubbed.
1292 * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's
1293 * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to
1294 * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1
1295 * while a scrub is in progress, it scrubs the block right then.
1298 dsl_scan_ddt(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1300 ddt_bookmark_t
*ddb
= &scn
->scn_phys
.scn_ddt_bookmark
;
1305 bzero(&dde
, sizeof (ddt_entry_t
));
1307 while ((error
= ddt_walk(scn
->scn_dp
->dp_spa
, ddb
, &dde
)) == 0) {
1310 if (ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
)
1312 dprintf("visiting ddb=%llu/%llu/%llu/%llx\n",
1313 (longlong_t
)ddb
->ddb_class
,
1314 (longlong_t
)ddb
->ddb_type
,
1315 (longlong_t
)ddb
->ddb_checksum
,
1316 (longlong_t
)ddb
->ddb_cursor
);
1318 /* There should be no pending changes to the dedup table */
1319 ddt
= scn
->scn_dp
->dp_spa
->spa_ddt
[ddb
->ddb_checksum
];
1320 ASSERT(avl_first(&ddt
->ddt_tree
) == NULL
);
1322 dsl_scan_ddt_entry(scn
, ddb
->ddb_checksum
, &dde
, tx
);
1325 if (dsl_scan_check_pause(scn
, NULL
))
1329 zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u",
1330 (longlong_t
)n
, (int)scn
->scn_phys
.scn_ddt_class_max
,
1331 (int)scn
->scn_pausing
);
1333 ASSERT(error
== 0 || error
== ENOENT
);
1334 ASSERT(error
!= ENOENT
||
1335 ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
);
1340 dsl_scan_ddt_entry(dsl_scan_t
*scn
, enum zio_checksum checksum
,
1341 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
1343 const ddt_key_t
*ddk
= &dde
->dde_key
;
1344 ddt_phys_t
*ddp
= dde
->dde_phys
;
1346 zbookmark_phys_t zb
= { 0 };
1349 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1352 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1353 if (ddp
->ddp_phys_birth
== 0 ||
1354 ddp
->ddp_phys_birth
> scn
->scn_phys
.scn_max_txg
)
1356 ddt_bp_create(checksum
, ddk
, ddp
, &bp
);
1358 scn
->scn_visited_this_txg
++;
1359 scan_funcs
[scn
->scn_phys
.scn_func
](scn
->scn_dp
, &bp
, &zb
);
1364 dsl_scan_visit(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1366 dsl_pool_t
*dp
= scn
->scn_dp
;
1368 zap_attribute_t
*za
;
1370 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1371 scn
->scn_phys
.scn_ddt_class_max
) {
1372 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1373 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1374 dsl_scan_ddt(scn
, tx
);
1375 if (scn
->scn_pausing
)
1379 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== DMU_META_OBJSET
) {
1380 /* First do the MOS & ORIGIN */
1382 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1383 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1384 dsl_scan_visit_rootbp(scn
, NULL
,
1385 &dp
->dp_meta_rootbp
, tx
);
1386 spa_set_rootblkptr(dp
->dp_spa
, &dp
->dp_meta_rootbp
);
1387 if (scn
->scn_pausing
)
1390 if (spa_version(dp
->dp_spa
) < SPA_VERSION_DSL_SCRUB
) {
1391 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1392 enqueue_cb
, tx
, DS_FIND_CHILDREN
));
1394 dsl_scan_visitds(scn
,
1395 dp
->dp_origin_snap
->ds_object
, tx
);
1397 ASSERT(!scn
->scn_pausing
);
1398 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
!=
1399 ZB_DESTROYED_OBJSET
) {
1401 * If we were paused, continue from here. Note if the
1402 * ds we were paused on was deleted, the zb_objset may
1403 * be -1, so we will skip this and find a new objset
1406 dsl_scan_visitds(scn
, scn
->scn_phys
.scn_bookmark
.zb_objset
, tx
);
1407 if (scn
->scn_pausing
)
1412 * In case we were paused right at the end of the ds, zero the
1413 * bookmark so we don't think that we're still trying to resume.
1415 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (zbookmark_phys_t
));
1416 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_SLEEP
);
1417 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
1419 /* keep pulling things out of the zap-object-as-queue */
1420 while (zap_cursor_init(zc
, dp
->dp_meta_objset
,
1421 scn
->scn_phys
.scn_queue_obj
),
1422 zap_cursor_retrieve(zc
, za
) == 0) {
1426 dsobj
= strtonum(za
->za_name
, NULL
);
1427 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1428 scn
->scn_phys
.scn_queue_obj
, dsobj
, tx
));
1430 /* Set up min/max txg */
1431 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1432 if (za
->za_first_integer
!= 0) {
1433 scn
->scn_phys
.scn_cur_min_txg
=
1434 MAX(scn
->scn_phys
.scn_min_txg
,
1435 za
->za_first_integer
);
1437 scn
->scn_phys
.scn_cur_min_txg
=
1438 MAX(scn
->scn_phys
.scn_min_txg
,
1439 dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
1441 scn
->scn_phys
.scn_cur_max_txg
= dsl_scan_ds_maxtxg(ds
);
1442 dsl_dataset_rele(ds
, FTAG
);
1444 dsl_scan_visitds(scn
, dsobj
, tx
);
1445 zap_cursor_fini(zc
);
1446 if (scn
->scn_pausing
)
1449 zap_cursor_fini(zc
);
1451 kmem_free(za
, sizeof (zap_attribute_t
));
1452 kmem_free(zc
, sizeof (zap_cursor_t
));
1456 dsl_scan_free_should_pause(dsl_scan_t
*scn
)
1458 uint64_t elapsed_nanosecs
;
1463 if (scn
->scn_visited_this_txg
>= zfs_free_max_blocks
)
1466 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
1467 return (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
1468 (NSEC2MSEC(elapsed_nanosecs
) > zfs_free_min_time_ms
&&
1469 txg_sync_waiting(scn
->scn_dp
)) ||
1470 spa_shutting_down(scn
->scn_dp
->dp_spa
));
1474 dsl_scan_free_block_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1476 dsl_scan_t
*scn
= arg
;
1478 if (!scn
->scn_is_bptree
||
1479 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_OBJSET
)) {
1480 if (dsl_scan_free_should_pause(scn
))
1481 return (SET_ERROR(ERESTART
));
1484 zio_nowait(zio_free_sync(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
,
1485 dmu_tx_get_txg(tx
), bp
, 0));
1486 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
, DD_USED_HEAD
,
1487 -bp_get_dsize_sync(scn
->scn_dp
->dp_spa
, bp
),
1488 -BP_GET_PSIZE(bp
), -BP_GET_UCSIZE(bp
), tx
);
1489 scn
->scn_visited_this_txg
++;
1494 dsl_scan_active(dsl_scan_t
*scn
)
1496 spa_t
*spa
= scn
->scn_dp
->dp_spa
;
1497 uint64_t used
= 0, comp
, uncomp
;
1499 if (spa
->spa_load_state
!= SPA_LOAD_NONE
)
1501 if (spa_shutting_down(spa
))
1503 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
||
1504 (scn
->scn_async_destroying
&& !scn
->scn_async_stalled
))
1507 if (spa_version(scn
->scn_dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1508 (void) bpobj_space(&scn
->scn_dp
->dp_free_bpobj
,
1509 &used
, &comp
, &uncomp
);
1515 dsl_scan_sync(dsl_pool_t
*dp
, dmu_tx_t
*tx
)
1517 dsl_scan_t
*scn
= dp
->dp_scan
;
1518 spa_t
*spa
= dp
->dp_spa
;
1522 * Check for scn_restart_txg before checking spa_load_state, so
1523 * that we can restart an old-style scan while the pool is being
1524 * imported (see dsl_scan_init).
1526 if (dsl_scan_restarting(scn
, tx
)) {
1527 pool_scan_func_t func
= POOL_SCAN_SCRUB
;
1528 dsl_scan_done(scn
, B_FALSE
, tx
);
1529 if (vdev_resilver_needed(spa
->spa_root_vdev
, NULL
, NULL
))
1530 func
= POOL_SCAN_RESILVER
;
1531 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1533 dsl_scan_setup_sync(&func
, tx
);
1537 * Only process scans in sync pass 1.
1539 if (spa_sync_pass(dp
->dp_spa
) > 1)
1543 * If the spa is shutting down, then stop scanning. This will
1544 * ensure that the scan does not dirty any new data during the
1547 if (spa_shutting_down(spa
))
1551 * If the scan is inactive due to a stalled async destroy, try again.
1553 if (!scn
->scn_async_stalled
&& !dsl_scan_active(scn
))
1556 scn
->scn_visited_this_txg
= 0;
1557 scn
->scn_pausing
= B_FALSE
;
1558 scn
->scn_sync_start_time
= gethrtime();
1559 spa
->spa_scrub_active
= B_TRUE
;
1562 * First process the async destroys. If we pause, don't do
1563 * any scrubbing or resilvering. This ensures that there are no
1564 * async destroys while we are scanning, so the scan code doesn't
1565 * have to worry about traversing it. It is also faster to free the
1566 * blocks than to scrub them.
1568 if (zfs_free_bpobj_enabled
&&
1569 spa_version(dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1570 scn
->scn_is_bptree
= B_FALSE
;
1571 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1572 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1573 err
= bpobj_iterate(&dp
->dp_free_bpobj
,
1574 dsl_scan_free_block_cb
, scn
, tx
);
1575 VERIFY3U(0, ==, zio_wait(scn
->scn_zio_root
));
1577 if (err
!= 0 && err
!= ERESTART
)
1578 zfs_panic_recover("error %u from bpobj_iterate()", err
);
1581 if (err
== 0 && spa_feature_is_active(spa
, SPA_FEATURE_ASYNC_DESTROY
)) {
1582 ASSERT(scn
->scn_async_destroying
);
1583 scn
->scn_is_bptree
= B_TRUE
;
1584 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1585 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1586 err
= bptree_iterate(dp
->dp_meta_objset
,
1587 dp
->dp_bptree_obj
, B_TRUE
, dsl_scan_free_block_cb
, scn
, tx
);
1588 VERIFY0(zio_wait(scn
->scn_zio_root
));
1590 if (err
== EIO
|| err
== ECKSUM
) {
1592 } else if (err
!= 0 && err
!= ERESTART
) {
1593 zfs_panic_recover("error %u from "
1594 "traverse_dataset_destroyed()", err
);
1597 if (bptree_is_empty(dp
->dp_meta_objset
, dp
->dp_bptree_obj
)) {
1598 /* finished; deactivate async destroy feature */
1599 spa_feature_decr(spa
, SPA_FEATURE_ASYNC_DESTROY
, tx
);
1600 ASSERT(!spa_feature_is_active(spa
,
1601 SPA_FEATURE_ASYNC_DESTROY
));
1602 VERIFY0(zap_remove(dp
->dp_meta_objset
,
1603 DMU_POOL_DIRECTORY_OBJECT
,
1604 DMU_POOL_BPTREE_OBJ
, tx
));
1605 VERIFY0(bptree_free(dp
->dp_meta_objset
,
1606 dp
->dp_bptree_obj
, tx
));
1607 dp
->dp_bptree_obj
= 0;
1608 scn
->scn_async_destroying
= B_FALSE
;
1609 scn
->scn_async_stalled
= B_FALSE
;
1612 * If we didn't make progress, mark the async
1613 * destroy as stalled, so that we will not initiate
1614 * a spa_sync() on its behalf. Note that we only
1615 * check this if we are not finished, because if the
1616 * bptree had no blocks for us to visit, we can
1617 * finish without "making progress".
1619 scn
->scn_async_stalled
=
1620 (scn
->scn_visited_this_txg
== 0);
1623 if (scn
->scn_visited_this_txg
) {
1624 zfs_dbgmsg("freed %llu blocks in %llums from "
1625 "free_bpobj/bptree txg %llu; err=%u",
1626 (longlong_t
)scn
->scn_visited_this_txg
,
1628 NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
),
1629 (longlong_t
)tx
->tx_txg
, err
);
1630 scn
->scn_visited_this_txg
= 0;
1633 * Write out changes to the DDT that may be required as a
1634 * result of the blocks freed. This ensures that the DDT
1635 * is clean when a scrub/resilver runs.
1637 ddt_sync(spa
, tx
->tx_txg
);
1641 if (dp
->dp_free_dir
!= NULL
&& !scn
->scn_async_destroying
&&
1642 zfs_free_leak_on_eio
&&
1643 (dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
!= 0 ||
1644 dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
!= 0 ||
1645 dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
!= 0)) {
1647 * We have finished background destroying, but there is still
1648 * some space left in the dp_free_dir. Transfer this leaked
1649 * space to the dp_leak_dir.
1651 if (dp
->dp_leak_dir
== NULL
) {
1652 rrw_enter(&dp
->dp_config_rwlock
, RW_WRITER
, FTAG
);
1653 (void) dsl_dir_create_sync(dp
, dp
->dp_root_dir
,
1655 VERIFY0(dsl_pool_open_special_dir(dp
,
1656 LEAK_DIR_NAME
, &dp
->dp_leak_dir
));
1657 rrw_exit(&dp
->dp_config_rwlock
, FTAG
);
1659 dsl_dir_diduse_space(dp
->dp_leak_dir
, DD_USED_HEAD
,
1660 dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
,
1661 dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
,
1662 dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
, tx
);
1663 dsl_dir_diduse_space(dp
->dp_free_dir
, DD_USED_HEAD
,
1664 -dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
,
1665 -dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
,
1666 -dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
, tx
);
1668 if (dp
->dp_free_dir
!= NULL
&& !scn
->scn_async_destroying
) {
1669 /* finished; verify that space accounting went to zero */
1670 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
);
1671 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
);
1672 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
);
1675 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1678 if (scn
->scn_done_txg
== tx
->tx_txg
) {
1679 ASSERT(!scn
->scn_pausing
);
1680 /* finished with scan. */
1681 zfs_dbgmsg("txg %llu scan complete", tx
->tx_txg
);
1682 dsl_scan_done(scn
, B_TRUE
, tx
);
1683 ASSERT3U(spa
->spa_scrub_inflight
, ==, 0);
1684 dsl_scan_sync_state(scn
, tx
);
1688 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1689 scn
->scn_phys
.scn_ddt_class_max
) {
1690 zfs_dbgmsg("doing scan sync txg %llu; "
1691 "ddt bm=%llu/%llu/%llu/%llx",
1692 (longlong_t
)tx
->tx_txg
,
1693 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
1694 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
1695 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
1696 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
1697 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_objset
== 0);
1698 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_object
== 0);
1699 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_level
== 0);
1700 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_blkid
== 0);
1702 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1703 (longlong_t
)tx
->tx_txg
,
1704 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_objset
,
1705 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_object
,
1706 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_level
,
1707 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_blkid
);
1710 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1711 NULL
, ZIO_FLAG_CANFAIL
);
1712 dsl_pool_config_enter(dp
, FTAG
);
1713 dsl_scan_visit(scn
, tx
);
1714 dsl_pool_config_exit(dp
, FTAG
);
1715 (void) zio_wait(scn
->scn_zio_root
);
1716 scn
->scn_zio_root
= NULL
;
1718 zfs_dbgmsg("visited %llu blocks in %llums",
1719 (longlong_t
)scn
->scn_visited_this_txg
,
1720 (longlong_t
)NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
));
1722 if (!scn
->scn_pausing
) {
1723 scn
->scn_done_txg
= tx
->tx_txg
+ 1;
1724 zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
1725 tx
->tx_txg
, scn
->scn_done_txg
);
1728 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
1729 mutex_enter(&spa
->spa_scrub_lock
);
1730 while (spa
->spa_scrub_inflight
> 0) {
1731 cv_wait(&spa
->spa_scrub_io_cv
,
1732 &spa
->spa_scrub_lock
);
1734 mutex_exit(&spa
->spa_scrub_lock
);
1737 dsl_scan_sync_state(scn
, tx
);
1741 * This will start a new scan, or restart an existing one.
1744 dsl_resilver_restart(dsl_pool_t
*dp
, uint64_t txg
)
1748 tx
= dmu_tx_create_dd(dp
->dp_mos_dir
);
1749 VERIFY(0 == dmu_tx_assign(tx
, TXG_WAIT
));
1751 txg
= dmu_tx_get_txg(tx
);
1752 dp
->dp_scan
->scn_restart_txg
= txg
;
1755 dp
->dp_scan
->scn_restart_txg
= txg
;
1757 zfs_dbgmsg("restarting resilver txg=%llu", txg
);
1761 dsl_scan_resilvering(dsl_pool_t
*dp
)
1763 return (dp
->dp_scan
->scn_phys
.scn_state
== DSS_SCANNING
&&
1764 dp
->dp_scan
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
);
1772 count_block(zfs_all_blkstats_t
*zab
, const blkptr_t
*bp
)
1777 * If we resume after a reboot, zab will be NULL; don't record
1778 * incomplete stats in that case.
1783 for (i
= 0; i
< 4; i
++) {
1784 int l
= (i
< 2) ? BP_GET_LEVEL(bp
) : DN_MAX_LEVELS
;
1785 int t
= (i
& 1) ? BP_GET_TYPE(bp
) : DMU_OT_TOTAL
;
1789 if (t
& DMU_OT_NEWTYPE
)
1792 zb
= &zab
->zab_type
[l
][t
];
1794 zb
->zb_asize
+= BP_GET_ASIZE(bp
);
1795 zb
->zb_lsize
+= BP_GET_LSIZE(bp
);
1796 zb
->zb_psize
+= BP_GET_PSIZE(bp
);
1797 zb
->zb_gangs
+= BP_COUNT_GANG(bp
);
1799 switch (BP_GET_NDVAS(bp
)) {
1801 if (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1802 DVA_GET_VDEV(&bp
->blk_dva
[1]))
1803 zb
->zb_ditto_2_of_2_samevdev
++;
1806 equal
= (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1807 DVA_GET_VDEV(&bp
->blk_dva
[1])) +
1808 (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1809 DVA_GET_VDEV(&bp
->blk_dva
[2])) +
1810 (DVA_GET_VDEV(&bp
->blk_dva
[1]) ==
1811 DVA_GET_VDEV(&bp
->blk_dva
[2]));
1813 zb
->zb_ditto_2_of_3_samevdev
++;
1814 else if (equal
== 3)
1815 zb
->zb_ditto_3_of_3_samevdev
++;
1822 dsl_scan_scrub_done(zio_t
*zio
)
1824 spa_t
*spa
= zio
->io_spa
;
1826 zio_data_buf_free(zio
->io_data
, zio
->io_size
);
1828 mutex_enter(&spa
->spa_scrub_lock
);
1829 spa
->spa_scrub_inflight
--;
1830 cv_broadcast(&spa
->spa_scrub_io_cv
);
1832 if (zio
->io_error
&& (zio
->io_error
!= ECKSUM
||
1833 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
))) {
1834 spa
->spa_dsl_pool
->dp_scan
->scn_phys
.scn_errors
++;
1836 mutex_exit(&spa
->spa_scrub_lock
);
1840 dsl_scan_scrub_cb(dsl_pool_t
*dp
,
1841 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
1843 dsl_scan_t
*scn
= dp
->dp_scan
;
1844 size_t size
= BP_GET_PSIZE(bp
);
1845 spa_t
*spa
= dp
->dp_spa
;
1846 uint64_t phys_birth
= BP_PHYSICAL_BIRTH(bp
);
1847 boolean_t needs_io
= B_FALSE
;
1848 int zio_flags
= ZIO_FLAG_SCAN_THREAD
| ZIO_FLAG_RAW
| ZIO_FLAG_CANFAIL
;
1852 if (phys_birth
<= scn
->scn_phys
.scn_min_txg
||
1853 phys_birth
>= scn
->scn_phys
.scn_max_txg
)
1856 count_block(dp
->dp_blkstats
, bp
);
1858 if (BP_IS_EMBEDDED(bp
))
1861 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn
));
1862 if (scn
->scn_phys
.scn_func
== POOL_SCAN_SCRUB
) {
1863 zio_flags
|= ZIO_FLAG_SCRUB
;
1865 scan_delay
= zfs_scrub_delay
;
1867 ASSERT3U(scn
->scn_phys
.scn_func
, ==, POOL_SCAN_RESILVER
);
1868 zio_flags
|= ZIO_FLAG_RESILVER
;
1870 scan_delay
= zfs_resilver_delay
;
1873 /* If it's an intent log block, failure is expected. */
1874 if (zb
->zb_level
== ZB_ZIL_LEVEL
)
1875 zio_flags
|= ZIO_FLAG_SPECULATIVE
;
1877 for (d
= 0; d
< BP_GET_NDVAS(bp
); d
++) {
1878 vdev_t
*vd
= vdev_lookup_top(spa
,
1879 DVA_GET_VDEV(&bp
->blk_dva
[d
]));
1882 * Keep track of how much data we've examined so that
1883 * zpool(1M) status can make useful progress reports.
1885 scn
->scn_phys
.scn_examined
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1886 spa
->spa_scan_pass_exam
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1888 /* if it's a resilver, this may not be in the target range */
1890 if (DVA_GET_GANG(&bp
->blk_dva
[d
])) {
1892 * Gang members may be spread across multiple
1893 * vdevs, so the best estimate we have is the
1894 * scrub range, which has already been checked.
1895 * XXX -- it would be better to change our
1896 * allocation policy to ensure that all
1897 * gang members reside on the same vdev.
1901 needs_io
= vdev_dtl_contains(vd
, DTL_PARTIAL
,
1907 if (needs_io
&& !zfs_no_scrub_io
) {
1908 vdev_t
*rvd
= spa
->spa_root_vdev
;
1909 uint64_t maxinflight
= rvd
->vdev_children
* zfs_top_maxinflight
;
1910 void *data
= zio_data_buf_alloc(size
);
1912 mutex_enter(&spa
->spa_scrub_lock
);
1913 while (spa
->spa_scrub_inflight
>= maxinflight
)
1914 cv_wait(&spa
->spa_scrub_io_cv
, &spa
->spa_scrub_lock
);
1915 spa
->spa_scrub_inflight
++;
1916 mutex_exit(&spa
->spa_scrub_lock
);
1919 * If we're seeing recent (zfs_scan_idle) "important" I/Os
1920 * then throttle our workload to limit the impact of a scan.
1922 if (ddi_get_lbolt64() - spa
->spa_last_io
<= zfs_scan_idle
)
1925 zio_nowait(zio_read(NULL
, spa
, bp
, data
, size
,
1926 dsl_scan_scrub_done
, NULL
, ZIO_PRIORITY_SCRUB
,
1930 /* do not relocate this block */
1935 dsl_scan(dsl_pool_t
*dp
, pool_scan_func_t func
)
1937 spa_t
*spa
= dp
->dp_spa
;
1940 * Purge all vdev caches and probe all devices. We do this here
1941 * rather than in sync context because this requires a writer lock
1942 * on the spa_config lock, which we can't do from sync context. The
1943 * spa_scrub_reopen flag indicates that vdev_open() should not
1944 * attempt to start another scrub.
1946 spa_vdev_state_enter(spa
, SCL_NONE
);
1947 spa
->spa_scrub_reopen
= B_TRUE
;
1948 vdev_reopen(spa
->spa_root_vdev
);
1949 spa
->spa_scrub_reopen
= B_FALSE
;
1950 (void) spa_vdev_state_exit(spa
, NULL
, 0);
1952 return (dsl_sync_task(spa_name(spa
), dsl_scan_setup_check
,
1953 dsl_scan_setup_sync
, &func
, 0, ZFS_SPACE_CHECK_NONE
));
1957 dsl_scan_restarting(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1959 return (scn
->scn_restart_txg
!= 0 &&
1960 scn
->scn_restart_txg
<= tx
->tx_txg
);
1963 #if defined(_KERNEL) && defined(HAVE_SPL)
1964 module_param(zfs_top_maxinflight
, int, 0644);
1965 MODULE_PARM_DESC(zfs_top_maxinflight
, "Max I/Os per top-level");
1967 module_param(zfs_resilver_delay
, int, 0644);
1968 MODULE_PARM_DESC(zfs_resilver_delay
, "Number of ticks to delay resilver");
1970 module_param(zfs_scrub_delay
, int, 0644);
1971 MODULE_PARM_DESC(zfs_scrub_delay
, "Number of ticks to delay scrub");
1973 module_param(zfs_scan_idle
, int, 0644);
1974 MODULE_PARM_DESC(zfs_scan_idle
, "Idle window in clock ticks");
1976 module_param(zfs_scan_min_time_ms
, int, 0644);
1977 MODULE_PARM_DESC(zfs_scan_min_time_ms
, "Min millisecs to scrub per txg");
1979 module_param(zfs_free_min_time_ms
, int, 0644);
1980 MODULE_PARM_DESC(zfs_free_min_time_ms
, "Min millisecs to free per txg");
1982 module_param(zfs_resilver_min_time_ms
, int, 0644);
1983 MODULE_PARM_DESC(zfs_resilver_min_time_ms
, "Min millisecs to resilver per txg");
1985 module_param(zfs_no_scrub_io
, int, 0644);
1986 MODULE_PARM_DESC(zfs_no_scrub_io
, "Set to disable scrub I/O");
1988 module_param(zfs_no_scrub_prefetch
, int, 0644);
1989 MODULE_PARM_DESC(zfs_no_scrub_prefetch
, "Set to disable scrub prefetching");
1991 module_param(zfs_free_max_blocks
, ulong
, 0644);
1992 MODULE_PARM_DESC(zfs_free_max_blocks
, "Max number of blocks freed in one txg");
1994 module_param(zfs_free_bpobj_enabled
, int, 0644);
1995 MODULE_PARM_DESC(zfs_free_bpobj_enabled
, "Enable processing of the free_bpobj");