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
; i
++, cdnp
++) {
713 for (j
= 0; j
< cdnp
->dn_nblkptr
; j
++) {
714 blkptr_t
*cbp
= &cdnp
->dn_blkptr
[j
];
715 dsl_scan_prefetch(scn
, buf
, cbp
,
716 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
, j
);
719 for (i
= 0, cdnp
= buf
->b_data
; i
< epb
; i
++, cdnp
++) {
720 dsl_scan_visitdnode(scn
, ds
, ostype
,
721 cdnp
, zb
->zb_blkid
* epb
+ i
, tx
);
724 (void) arc_buf_remove_ref(buf
, &buf
);
725 } else if (BP_GET_TYPE(bp
) == DMU_OT_OBJSET
) {
726 arc_flags_t flags
= ARC_FLAG_WAIT
;
730 err
= arc_read(NULL
, dp
->dp_spa
, bp
, arc_getbuf_func
, &buf
,
731 ZIO_PRIORITY_ASYNC_READ
, zio_flags
, &flags
, zb
);
733 scn
->scn_phys
.scn_errors
++;
739 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
740 &osp
->os_meta_dnode
, DMU_META_DNODE_OBJECT
, tx
);
742 if (OBJSET_BUF_HAS_USERUSED(buf
)) {
744 * We also always visit user/group accounting
745 * objects, and never skip them, even if we are
746 * pausing. This is necessary so that the space
747 * deltas from this txg get integrated.
749 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
750 &osp
->os_groupused_dnode
,
751 DMU_GROUPUSED_OBJECT
, tx
);
752 dsl_scan_visitdnode(scn
, ds
, osp
->os_type
,
753 &osp
->os_userused_dnode
,
754 DMU_USERUSED_OBJECT
, tx
);
756 (void) arc_buf_remove_ref(buf
, &buf
);
762 inline __attribute__((always_inline
)) static void
763 dsl_scan_visitdnode(dsl_scan_t
*scn
, dsl_dataset_t
*ds
,
764 dmu_objset_type_t ostype
, dnode_phys_t
*dnp
,
765 uint64_t object
, dmu_tx_t
*tx
)
769 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
770 zbookmark_phys_t czb
;
772 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
773 dnp
->dn_nlevels
- 1, j
);
774 dsl_scan_visitbp(&dnp
->dn_blkptr
[j
],
775 &czb
, dnp
, ds
, scn
, ostype
, tx
);
778 if (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
) {
779 zbookmark_phys_t czb
;
780 SET_BOOKMARK(&czb
, ds
? ds
->ds_object
: 0, object
,
782 dsl_scan_visitbp(&dnp
->dn_spill
,
783 &czb
, dnp
, ds
, scn
, ostype
, tx
);
788 * The arguments are in this order because mdb can only print the
789 * first 5; we want them to be useful.
792 dsl_scan_visitbp(blkptr_t
*bp
, const zbookmark_phys_t
*zb
,
793 dnode_phys_t
*dnp
, dsl_dataset_t
*ds
, dsl_scan_t
*scn
,
794 dmu_objset_type_t ostype
, dmu_tx_t
*tx
)
796 dsl_pool_t
*dp
= scn
->scn_dp
;
799 bp_toread
= kmem_alloc(sizeof (blkptr_t
), KM_SLEEP
);
802 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
804 if (dsl_scan_check_pause(scn
, zb
))
807 if (dsl_scan_check_resume(scn
, dnp
, zb
))
813 scn
->scn_visited_this_txg
++;
816 * This debugging is commented out to conserve stack space. This
817 * function is called recursively and the debugging addes several
818 * bytes to the stack for each call. It can be commented back in
819 * if required to debug an issue in dsl_scan_visitbp().
822 * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p",
823 * ds, ds ? ds->ds_object : 0,
824 * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
828 if (bp
->blk_birth
<= scn
->scn_phys
.scn_cur_min_txg
)
831 if (dsl_scan_recurse(scn
, ds
, ostype
, dnp
, bp_toread
, zb
, tx
) != 0)
835 * If dsl_scan_ddt() has aready visited this block, it will have
836 * already done any translations or scrubbing, so don't call the
839 if (ddt_class_contains(dp
->dp_spa
,
840 scn
->scn_phys
.scn_ddt_class_max
, bp
)) {
845 * If this block is from the future (after cur_max_txg), then we
846 * are doing this on behalf of a deleted snapshot, and we will
847 * revisit the future block on the next pass of this dataset.
848 * Don't scan it now unless we need to because something
849 * under it was modified.
851 if (BP_PHYSICAL_BIRTH(bp
) <= scn
->scn_phys
.scn_cur_max_txg
) {
852 scan_funcs
[scn
->scn_phys
.scn_func
](dp
, bp
, zb
);
855 kmem_free(bp_toread
, sizeof (blkptr_t
));
859 dsl_scan_visit_rootbp(dsl_scan_t
*scn
, dsl_dataset_t
*ds
, blkptr_t
*bp
,
864 SET_BOOKMARK(&zb
, ds
? ds
->ds_object
: DMU_META_OBJSET
,
865 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
866 dsl_scan_visitbp(bp
, &zb
, NULL
,
867 ds
, scn
, DMU_OST_NONE
, tx
);
869 dprintf_ds(ds
, "finished scan%s", "");
873 dsl_scan_ds_destroyed(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
875 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
876 dsl_scan_t
*scn
= dp
->dp_scan
;
879 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
882 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
883 if (ds
->ds_is_snapshot
) {
886 * - scn_cur_{min,max}_txg stays the same.
887 * - Setting the flag is not really necessary if
888 * scn_cur_max_txg == scn_max_txg, because there
889 * is nothing after this snapshot that we care
890 * about. However, we set it anyway and then
891 * ignore it when we retraverse it in
892 * dsl_scan_visitds().
894 scn
->scn_phys
.scn_bookmark
.zb_objset
=
895 dsl_dataset_phys(ds
)->ds_next_snap_obj
;
896 zfs_dbgmsg("destroying ds %llu; currently traversing; "
897 "reset zb_objset to %llu",
898 (u_longlong_t
)ds
->ds_object
,
899 (u_longlong_t
)dsl_dataset_phys(ds
)->
901 scn
->scn_phys
.scn_flags
|= DSF_VISIT_DS_AGAIN
;
903 SET_BOOKMARK(&scn
->scn_phys
.scn_bookmark
,
904 ZB_DESTROYED_OBJSET
, 0, 0, 0);
905 zfs_dbgmsg("destroying ds %llu; currently traversing; "
906 "reset bookmark to -1,0,0,0",
907 (u_longlong_t
)ds
->ds_object
);
909 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
910 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
911 ASSERT3U(dsl_dataset_phys(ds
)->ds_num_children
, <=, 1);
912 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
913 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
914 if (ds
->ds_is_snapshot
) {
916 * We keep the same mintxg; it could be >
917 * ds_creation_txg if the previous snapshot was
920 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
921 scn
->scn_phys
.scn_queue_obj
,
922 dsl_dataset_phys(ds
)->ds_next_snap_obj
,
924 zfs_dbgmsg("destroying ds %llu; in queue; "
925 "replacing with %llu",
926 (u_longlong_t
)ds
->ds_object
,
927 (u_longlong_t
)dsl_dataset_phys(ds
)->
930 zfs_dbgmsg("destroying ds %llu; in queue; removing",
931 (u_longlong_t
)ds
->ds_object
);
936 * dsl_scan_sync() should be called after this, and should sync
937 * out our changed state, but just to be safe, do it here.
939 dsl_scan_sync_state(scn
, tx
);
943 dsl_scan_ds_snapshotted(dsl_dataset_t
*ds
, dmu_tx_t
*tx
)
945 dsl_pool_t
*dp
= ds
->ds_dir
->dd_pool
;
946 dsl_scan_t
*scn
= dp
->dp_scan
;
949 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
952 ASSERT(dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0);
954 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds
->ds_object
) {
955 scn
->scn_phys
.scn_bookmark
.zb_objset
=
956 dsl_dataset_phys(ds
)->ds_prev_snap_obj
;
957 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
958 "reset zb_objset to %llu",
959 (u_longlong_t
)ds
->ds_object
,
960 (u_longlong_t
)dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
961 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
962 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, &mintxg
) == 0) {
963 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
964 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
, tx
));
965 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
966 scn
->scn_phys
.scn_queue_obj
,
967 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, mintxg
, tx
) == 0);
968 zfs_dbgmsg("snapshotting ds %llu; in queue; "
969 "replacing with %llu",
970 (u_longlong_t
)ds
->ds_object
,
971 (u_longlong_t
)dsl_dataset_phys(ds
)->ds_prev_snap_obj
);
973 dsl_scan_sync_state(scn
, tx
);
977 dsl_scan_ds_clone_swapped(dsl_dataset_t
*ds1
, dsl_dataset_t
*ds2
, dmu_tx_t
*tx
)
979 dsl_pool_t
*dp
= ds1
->ds_dir
->dd_pool
;
980 dsl_scan_t
*scn
= dp
->dp_scan
;
983 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
986 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds1
->ds_object
) {
987 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds2
->ds_object
;
988 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
989 "reset zb_objset to %llu",
990 (u_longlong_t
)ds1
->ds_object
,
991 (u_longlong_t
)ds2
->ds_object
);
992 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
== ds2
->ds_object
) {
993 scn
->scn_phys
.scn_bookmark
.zb_objset
= ds1
->ds_object
;
994 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
995 "reset zb_objset to %llu",
996 (u_longlong_t
)ds2
->ds_object
,
997 (u_longlong_t
)ds1
->ds_object
);
1000 if (zap_lookup_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1001 ds1
->ds_object
, &mintxg
) == 0) {
1004 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds1
)->ds_prev_snap_txg
);
1005 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds2
)->ds_prev_snap_txg
);
1006 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1007 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, tx
));
1008 err
= zap_add_int_key(dp
->dp_meta_objset
,
1009 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, mintxg
, tx
);
1010 VERIFY(err
== 0 || err
== EEXIST
);
1011 if (err
== EEXIST
) {
1012 /* Both were there to begin with */
1013 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
1014 scn
->scn_phys
.scn_queue_obj
,
1015 ds1
->ds_object
, mintxg
, tx
));
1017 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1018 "replacing with %llu",
1019 (u_longlong_t
)ds1
->ds_object
,
1020 (u_longlong_t
)ds2
->ds_object
);
1021 } else if (zap_lookup_int_key(dp
->dp_meta_objset
,
1022 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, &mintxg
) == 0) {
1023 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds1
)->ds_prev_snap_txg
);
1024 ASSERT3U(mintxg
, ==, dsl_dataset_phys(ds2
)->ds_prev_snap_txg
);
1025 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1026 scn
->scn_phys
.scn_queue_obj
, ds2
->ds_object
, tx
));
1027 VERIFY(0 == zap_add_int_key(dp
->dp_meta_objset
,
1028 scn
->scn_phys
.scn_queue_obj
, ds1
->ds_object
, mintxg
, tx
));
1029 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1030 "replacing with %llu",
1031 (u_longlong_t
)ds2
->ds_object
,
1032 (u_longlong_t
)ds1
->ds_object
);
1035 dsl_scan_sync_state(scn
, tx
);
1038 struct enqueue_clones_arg
{
1045 enqueue_clones_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1047 struct enqueue_clones_arg
*eca
= arg
;
1050 dsl_scan_t
*scn
= dp
->dp_scan
;
1052 if (dsl_dir_phys(hds
->ds_dir
)->dd_origin_obj
!= eca
->originobj
)
1055 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1059 while (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= eca
->originobj
) {
1060 dsl_dataset_t
*prev
;
1061 err
= dsl_dataset_hold_obj(dp
,
1062 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1064 dsl_dataset_rele(ds
, FTAG
);
1069 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1070 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1071 dsl_dataset_phys(ds
)->ds_prev_snap_txg
, eca
->tx
) == 0);
1072 dsl_dataset_rele(ds
, FTAG
);
1077 dsl_scan_visitds(dsl_scan_t
*scn
, uint64_t dsobj
, dmu_tx_t
*tx
)
1079 dsl_pool_t
*dp
= scn
->scn_dp
;
1084 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1086 if (scn
->scn_phys
.scn_cur_min_txg
>=
1087 scn
->scn_phys
.scn_max_txg
) {
1089 * This can happen if this snapshot was created after the
1090 * scan started, and we already completed a previous snapshot
1091 * that was created after the scan started. This snapshot
1092 * only references blocks with:
1094 * birth < our ds_creation_txg
1095 * cur_min_txg is no less than ds_creation_txg.
1096 * We have already visited these blocks.
1098 * birth > scn_max_txg
1099 * The scan requested not to visit these blocks.
1101 * Subsequent snapshots (and clones) can reference our
1102 * blocks, or blocks with even higher birth times.
1103 * Therefore we do not need to visit them either,
1104 * so we do not add them to the work queue.
1106 * Note that checking for cur_min_txg >= cur_max_txg
1107 * is not sufficient, because in that case we may need to
1108 * visit subsequent snapshots. This happens when min_txg > 0,
1109 * which raises cur_min_txg. In this case we will visit
1110 * this dataset but skip all of its blocks, because the
1111 * rootbp's birth time is < cur_min_txg. Then we will
1112 * add the next snapshots/clones to the work queue.
1114 char *dsname
= kmem_alloc(MAXNAMELEN
, KM_SLEEP
);
1115 dsl_dataset_name(ds
, dsname
);
1116 zfs_dbgmsg("scanning dataset %llu (%s) is unnecessary because "
1117 "cur_min_txg (%llu) >= max_txg (%llu)",
1119 scn
->scn_phys
.scn_cur_min_txg
,
1120 scn
->scn_phys
.scn_max_txg
);
1121 kmem_free(dsname
, MAXNAMELEN
);
1126 if (dmu_objset_from_ds(ds
, &os
))
1130 * Only the ZIL in the head (non-snapshot) is valid. Even though
1131 * snapshots can have ZIL block pointers (which may be the same
1132 * BP as in the head), they must be ignored. So we traverse the
1133 * ZIL here, rather than in scan_recurse(), because the regular
1134 * snapshot block-sharing rules don't apply to it.
1136 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
) && !ds
->ds_is_snapshot
)
1137 dsl_scan_zil(dp
, &os
->os_zil_header
);
1140 * Iterate over the bps in this ds.
1142 dmu_buf_will_dirty(ds
->ds_dbuf
, tx
);
1143 dsl_scan_visit_rootbp(scn
, ds
, &dsl_dataset_phys(ds
)->ds_bp
, tx
);
1145 dsname
= kmem_alloc(ZFS_MAXNAMELEN
, KM_SLEEP
);
1146 dsl_dataset_name(ds
, dsname
);
1147 zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; "
1149 (longlong_t
)dsobj
, dsname
,
1150 (longlong_t
)scn
->scn_phys
.scn_cur_min_txg
,
1151 (longlong_t
)scn
->scn_phys
.scn_cur_max_txg
,
1152 (int)scn
->scn_pausing
);
1153 kmem_free(dsname
, ZFS_MAXNAMELEN
);
1155 if (scn
->scn_pausing
)
1159 * We've finished this pass over this dataset.
1163 * If we did not completely visit this dataset, do another pass.
1165 if (scn
->scn_phys
.scn_flags
& DSF_VISIT_DS_AGAIN
) {
1166 zfs_dbgmsg("incomplete pass; visiting again");
1167 scn
->scn_phys
.scn_flags
&= ~DSF_VISIT_DS_AGAIN
;
1168 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1169 scn
->scn_phys
.scn_queue_obj
, ds
->ds_object
,
1170 scn
->scn_phys
.scn_cur_max_txg
, tx
) == 0);
1175 * Add descendent datasets to work queue.
1177 if (dsl_dataset_phys(ds
)->ds_next_snap_obj
!= 0) {
1178 VERIFY(zap_add_int_key(dp
->dp_meta_objset
,
1179 scn
->scn_phys
.scn_queue_obj
,
1180 dsl_dataset_phys(ds
)->ds_next_snap_obj
,
1181 dsl_dataset_phys(ds
)->ds_creation_txg
, tx
) == 0);
1183 if (dsl_dataset_phys(ds
)->ds_num_children
> 1) {
1184 boolean_t usenext
= B_FALSE
;
1185 if (dsl_dataset_phys(ds
)->ds_next_clones_obj
!= 0) {
1188 * A bug in a previous version of the code could
1189 * cause upgrade_clones_cb() to not set
1190 * ds_next_snap_obj when it should, leading to a
1191 * missing entry. Therefore we can only use the
1192 * next_clones_obj when its count is correct.
1194 int err
= zap_count(dp
->dp_meta_objset
,
1195 dsl_dataset_phys(ds
)->ds_next_clones_obj
, &count
);
1197 count
== dsl_dataset_phys(ds
)->ds_num_children
- 1)
1202 VERIFY0(zap_join_key(dp
->dp_meta_objset
,
1203 dsl_dataset_phys(ds
)->ds_next_clones_obj
,
1204 scn
->scn_phys
.scn_queue_obj
,
1205 dsl_dataset_phys(ds
)->ds_creation_txg
, tx
));
1207 struct enqueue_clones_arg eca
;
1209 eca
.originobj
= ds
->ds_object
;
1211 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1212 enqueue_clones_cb
, &eca
, DS_FIND_CHILDREN
));
1217 dsl_dataset_rele(ds
, FTAG
);
1222 enqueue_cb(dsl_pool_t
*dp
, dsl_dataset_t
*hds
, void *arg
)
1227 dsl_scan_t
*scn
= dp
->dp_scan
;
1229 err
= dsl_dataset_hold_obj(dp
, hds
->ds_object
, FTAG
, &ds
);
1233 while (dsl_dataset_phys(ds
)->ds_prev_snap_obj
!= 0) {
1234 dsl_dataset_t
*prev
;
1235 err
= dsl_dataset_hold_obj(dp
,
1236 dsl_dataset_phys(ds
)->ds_prev_snap_obj
, FTAG
, &prev
);
1238 dsl_dataset_rele(ds
, FTAG
);
1243 * If this is a clone, we don't need to worry about it for now.
1245 if (dsl_dataset_phys(prev
)->ds_next_snap_obj
!= ds
->ds_object
) {
1246 dsl_dataset_rele(ds
, FTAG
);
1247 dsl_dataset_rele(prev
, FTAG
);
1250 dsl_dataset_rele(ds
, FTAG
);
1254 VERIFY(zap_add_int_key(dp
->dp_meta_objset
, scn
->scn_phys
.scn_queue_obj
,
1255 ds
->ds_object
, dsl_dataset_phys(ds
)->ds_prev_snap_txg
, tx
) == 0);
1256 dsl_dataset_rele(ds
, FTAG
);
1261 * Scrub/dedup interaction.
1263 * If there are N references to a deduped block, we don't want to scrub it
1264 * N times -- ideally, we should scrub it exactly once.
1266 * We leverage the fact that the dde's replication class (enum ddt_class)
1267 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest
1268 * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order.
1270 * To prevent excess scrubbing, the scrub begins by walking the DDT
1271 * to find all blocks with refcnt > 1, and scrubs each of these once.
1272 * Since there are two replication classes which contain blocks with
1273 * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first.
1274 * Finally the top-down scrub begins, only visiting blocks with refcnt == 1.
1276 * There would be nothing more to say if a block's refcnt couldn't change
1277 * during a scrub, but of course it can so we must account for changes
1278 * in a block's replication class.
1280 * Here's an example of what can occur:
1282 * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1
1283 * when visited during the top-down scrub phase, it will be scrubbed twice.
1284 * This negates our scrub optimization, but is otherwise harmless.
1286 * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1
1287 * on each visit during the top-down scrub phase, it will never be scrubbed.
1288 * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's
1289 * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to
1290 * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1
1291 * while a scrub is in progress, it scrubs the block right then.
1294 dsl_scan_ddt(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1296 ddt_bookmark_t
*ddb
= &scn
->scn_phys
.scn_ddt_bookmark
;
1301 bzero(&dde
, sizeof (ddt_entry_t
));
1303 while ((error
= ddt_walk(scn
->scn_dp
->dp_spa
, ddb
, &dde
)) == 0) {
1306 if (ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
)
1308 dprintf("visiting ddb=%llu/%llu/%llu/%llx\n",
1309 (longlong_t
)ddb
->ddb_class
,
1310 (longlong_t
)ddb
->ddb_type
,
1311 (longlong_t
)ddb
->ddb_checksum
,
1312 (longlong_t
)ddb
->ddb_cursor
);
1314 /* There should be no pending changes to the dedup table */
1315 ddt
= scn
->scn_dp
->dp_spa
->spa_ddt
[ddb
->ddb_checksum
];
1316 ASSERT(avl_first(&ddt
->ddt_tree
) == NULL
);
1318 dsl_scan_ddt_entry(scn
, ddb
->ddb_checksum
, &dde
, tx
);
1321 if (dsl_scan_check_pause(scn
, NULL
))
1325 zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u",
1326 (longlong_t
)n
, (int)scn
->scn_phys
.scn_ddt_class_max
,
1327 (int)scn
->scn_pausing
);
1329 ASSERT(error
== 0 || error
== ENOENT
);
1330 ASSERT(error
!= ENOENT
||
1331 ddb
->ddb_class
> scn
->scn_phys
.scn_ddt_class_max
);
1336 dsl_scan_ddt_entry(dsl_scan_t
*scn
, enum zio_checksum checksum
,
1337 ddt_entry_t
*dde
, dmu_tx_t
*tx
)
1339 const ddt_key_t
*ddk
= &dde
->dde_key
;
1340 ddt_phys_t
*ddp
= dde
->dde_phys
;
1342 zbookmark_phys_t zb
= { 0 };
1345 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1348 for (p
= 0; p
< DDT_PHYS_TYPES
; p
++, ddp
++) {
1349 if (ddp
->ddp_phys_birth
== 0 ||
1350 ddp
->ddp_phys_birth
> scn
->scn_phys
.scn_max_txg
)
1352 ddt_bp_create(checksum
, ddk
, ddp
, &bp
);
1354 scn
->scn_visited_this_txg
++;
1355 scan_funcs
[scn
->scn_phys
.scn_func
](scn
->scn_dp
, &bp
, &zb
);
1360 dsl_scan_visit(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1362 dsl_pool_t
*dp
= scn
->scn_dp
;
1364 zap_attribute_t
*za
;
1366 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1367 scn
->scn_phys
.scn_ddt_class_max
) {
1368 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1369 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1370 dsl_scan_ddt(scn
, tx
);
1371 if (scn
->scn_pausing
)
1375 if (scn
->scn_phys
.scn_bookmark
.zb_objset
== DMU_META_OBJSET
) {
1376 /* First do the MOS & ORIGIN */
1378 scn
->scn_phys
.scn_cur_min_txg
= scn
->scn_phys
.scn_min_txg
;
1379 scn
->scn_phys
.scn_cur_max_txg
= scn
->scn_phys
.scn_max_txg
;
1380 dsl_scan_visit_rootbp(scn
, NULL
,
1381 &dp
->dp_meta_rootbp
, tx
);
1382 spa_set_rootblkptr(dp
->dp_spa
, &dp
->dp_meta_rootbp
);
1383 if (scn
->scn_pausing
)
1386 if (spa_version(dp
->dp_spa
) < SPA_VERSION_DSL_SCRUB
) {
1387 VERIFY0(dmu_objset_find_dp(dp
, dp
->dp_root_dir_obj
,
1388 enqueue_cb
, tx
, DS_FIND_CHILDREN
));
1390 dsl_scan_visitds(scn
,
1391 dp
->dp_origin_snap
->ds_object
, tx
);
1393 ASSERT(!scn
->scn_pausing
);
1394 } else if (scn
->scn_phys
.scn_bookmark
.zb_objset
!=
1395 ZB_DESTROYED_OBJSET
) {
1397 * If we were paused, continue from here. Note if the
1398 * ds we were paused on was deleted, the zb_objset may
1399 * be -1, so we will skip this and find a new objset
1402 dsl_scan_visitds(scn
, scn
->scn_phys
.scn_bookmark
.zb_objset
, tx
);
1403 if (scn
->scn_pausing
)
1408 * In case we were paused right at the end of the ds, zero the
1409 * bookmark so we don't think that we're still trying to resume.
1411 bzero(&scn
->scn_phys
.scn_bookmark
, sizeof (zbookmark_phys_t
));
1412 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_SLEEP
);
1413 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
1415 /* keep pulling things out of the zap-object-as-queue */
1416 while (zap_cursor_init(zc
, dp
->dp_meta_objset
,
1417 scn
->scn_phys
.scn_queue_obj
),
1418 zap_cursor_retrieve(zc
, za
) == 0) {
1422 dsobj
= strtonum(za
->za_name
, NULL
);
1423 VERIFY3U(0, ==, zap_remove_int(dp
->dp_meta_objset
,
1424 scn
->scn_phys
.scn_queue_obj
, dsobj
, tx
));
1426 /* Set up min/max txg */
1427 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp
, dsobj
, FTAG
, &ds
));
1428 if (za
->za_first_integer
!= 0) {
1429 scn
->scn_phys
.scn_cur_min_txg
=
1430 MAX(scn
->scn_phys
.scn_min_txg
,
1431 za
->za_first_integer
);
1433 scn
->scn_phys
.scn_cur_min_txg
=
1434 MAX(scn
->scn_phys
.scn_min_txg
,
1435 dsl_dataset_phys(ds
)->ds_prev_snap_txg
);
1437 scn
->scn_phys
.scn_cur_max_txg
= dsl_scan_ds_maxtxg(ds
);
1438 dsl_dataset_rele(ds
, FTAG
);
1440 dsl_scan_visitds(scn
, dsobj
, tx
);
1441 zap_cursor_fini(zc
);
1442 if (scn
->scn_pausing
)
1445 zap_cursor_fini(zc
);
1447 kmem_free(za
, sizeof (zap_attribute_t
));
1448 kmem_free(zc
, sizeof (zap_cursor_t
));
1452 dsl_scan_free_should_pause(dsl_scan_t
*scn
)
1454 uint64_t elapsed_nanosecs
;
1459 if (scn
->scn_visited_this_txg
>= zfs_free_max_blocks
)
1462 elapsed_nanosecs
= gethrtime() - scn
->scn_sync_start_time
;
1463 return (elapsed_nanosecs
/ NANOSEC
> zfs_txg_timeout
||
1464 (NSEC2MSEC(elapsed_nanosecs
) > zfs_free_min_time_ms
&&
1465 txg_sync_waiting(scn
->scn_dp
)) ||
1466 spa_shutting_down(scn
->scn_dp
->dp_spa
));
1470 dsl_scan_free_block_cb(void *arg
, const blkptr_t
*bp
, dmu_tx_t
*tx
)
1472 dsl_scan_t
*scn
= arg
;
1474 if (!scn
->scn_is_bptree
||
1475 (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_OBJSET
)) {
1476 if (dsl_scan_free_should_pause(scn
))
1477 return (SET_ERROR(ERESTART
));
1480 zio_nowait(zio_free_sync(scn
->scn_zio_root
, scn
->scn_dp
->dp_spa
,
1481 dmu_tx_get_txg(tx
), bp
, 0));
1482 dsl_dir_diduse_space(tx
->tx_pool
->dp_free_dir
, DD_USED_HEAD
,
1483 -bp_get_dsize_sync(scn
->scn_dp
->dp_spa
, bp
),
1484 -BP_GET_PSIZE(bp
), -BP_GET_UCSIZE(bp
), tx
);
1485 scn
->scn_visited_this_txg
++;
1490 dsl_scan_active(dsl_scan_t
*scn
)
1492 spa_t
*spa
= scn
->scn_dp
->dp_spa
;
1493 uint64_t used
= 0, comp
, uncomp
;
1495 if (spa
->spa_load_state
!= SPA_LOAD_NONE
)
1497 if (spa_shutting_down(spa
))
1499 if (scn
->scn_phys
.scn_state
== DSS_SCANNING
||
1500 (scn
->scn_async_destroying
&& !scn
->scn_async_stalled
))
1503 if (spa_version(scn
->scn_dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1504 (void) bpobj_space(&scn
->scn_dp
->dp_free_bpobj
,
1505 &used
, &comp
, &uncomp
);
1511 dsl_scan_sync(dsl_pool_t
*dp
, dmu_tx_t
*tx
)
1513 dsl_scan_t
*scn
= dp
->dp_scan
;
1514 spa_t
*spa
= dp
->dp_spa
;
1518 * Check for scn_restart_txg before checking spa_load_state, so
1519 * that we can restart an old-style scan while the pool is being
1520 * imported (see dsl_scan_init).
1522 if (dsl_scan_restarting(scn
, tx
)) {
1523 pool_scan_func_t func
= POOL_SCAN_SCRUB
;
1524 dsl_scan_done(scn
, B_FALSE
, tx
);
1525 if (vdev_resilver_needed(spa
->spa_root_vdev
, NULL
, NULL
))
1526 func
= POOL_SCAN_RESILVER
;
1527 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1529 dsl_scan_setup_sync(&func
, tx
);
1533 * Only process scans in sync pass 1.
1535 if (spa_sync_pass(dp
->dp_spa
) > 1)
1539 * If the spa is shutting down, then stop scanning. This will
1540 * ensure that the scan does not dirty any new data during the
1543 if (spa_shutting_down(spa
))
1547 * If the scan is inactive due to a stalled async destroy, try again.
1549 if (!scn
->scn_async_stalled
&& !dsl_scan_active(scn
))
1552 scn
->scn_visited_this_txg
= 0;
1553 scn
->scn_pausing
= B_FALSE
;
1554 scn
->scn_sync_start_time
= gethrtime();
1555 spa
->spa_scrub_active
= B_TRUE
;
1558 * First process the async destroys. If we pause, don't do
1559 * any scrubbing or resilvering. This ensures that there are no
1560 * async destroys while we are scanning, so the scan code doesn't
1561 * have to worry about traversing it. It is also faster to free the
1562 * blocks than to scrub them.
1564 if (zfs_free_bpobj_enabled
&&
1565 spa_version(dp
->dp_spa
) >= SPA_VERSION_DEADLISTS
) {
1566 scn
->scn_is_bptree
= B_FALSE
;
1567 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1568 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1569 err
= bpobj_iterate(&dp
->dp_free_bpobj
,
1570 dsl_scan_free_block_cb
, scn
, tx
);
1571 VERIFY3U(0, ==, zio_wait(scn
->scn_zio_root
));
1573 if (err
!= 0 && err
!= ERESTART
)
1574 zfs_panic_recover("error %u from bpobj_iterate()", err
);
1577 if (err
== 0 && spa_feature_is_active(spa
, SPA_FEATURE_ASYNC_DESTROY
)) {
1578 ASSERT(scn
->scn_async_destroying
);
1579 scn
->scn_is_bptree
= B_TRUE
;
1580 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1581 NULL
, ZIO_FLAG_MUSTSUCCEED
);
1582 err
= bptree_iterate(dp
->dp_meta_objset
,
1583 dp
->dp_bptree_obj
, B_TRUE
, dsl_scan_free_block_cb
, scn
, tx
);
1584 VERIFY0(zio_wait(scn
->scn_zio_root
));
1586 if (err
== EIO
|| err
== ECKSUM
) {
1588 } else if (err
!= 0 && err
!= ERESTART
) {
1589 zfs_panic_recover("error %u from "
1590 "traverse_dataset_destroyed()", err
);
1593 if (bptree_is_empty(dp
->dp_meta_objset
, dp
->dp_bptree_obj
)) {
1594 /* finished; deactivate async destroy feature */
1595 spa_feature_decr(spa
, SPA_FEATURE_ASYNC_DESTROY
, tx
);
1596 ASSERT(!spa_feature_is_active(spa
,
1597 SPA_FEATURE_ASYNC_DESTROY
));
1598 VERIFY0(zap_remove(dp
->dp_meta_objset
,
1599 DMU_POOL_DIRECTORY_OBJECT
,
1600 DMU_POOL_BPTREE_OBJ
, tx
));
1601 VERIFY0(bptree_free(dp
->dp_meta_objset
,
1602 dp
->dp_bptree_obj
, tx
));
1603 dp
->dp_bptree_obj
= 0;
1604 scn
->scn_async_destroying
= B_FALSE
;
1605 scn
->scn_async_stalled
= B_FALSE
;
1608 * If we didn't make progress, mark the async
1609 * destroy as stalled, so that we will not initiate
1610 * a spa_sync() on its behalf. Note that we only
1611 * check this if we are not finished, because if the
1612 * bptree had no blocks for us to visit, we can
1613 * finish without "making progress".
1615 scn
->scn_async_stalled
=
1616 (scn
->scn_visited_this_txg
== 0);
1619 if (scn
->scn_visited_this_txg
) {
1620 zfs_dbgmsg("freed %llu blocks in %llums from "
1621 "free_bpobj/bptree txg %llu; err=%u",
1622 (longlong_t
)scn
->scn_visited_this_txg
,
1624 NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
),
1625 (longlong_t
)tx
->tx_txg
, err
);
1626 scn
->scn_visited_this_txg
= 0;
1629 * Write out changes to the DDT that may be required as a
1630 * result of the blocks freed. This ensures that the DDT
1631 * is clean when a scrub/resilver runs.
1633 ddt_sync(spa
, tx
->tx_txg
);
1637 if (dp
->dp_free_dir
!= NULL
&& !scn
->scn_async_destroying
&&
1638 zfs_free_leak_on_eio
&&
1639 (dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
!= 0 ||
1640 dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
!= 0 ||
1641 dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
!= 0)) {
1643 * We have finished background destroying, but there is still
1644 * some space left in the dp_free_dir. Transfer this leaked
1645 * space to the dp_leak_dir.
1647 if (dp
->dp_leak_dir
== NULL
) {
1648 rrw_enter(&dp
->dp_config_rwlock
, RW_WRITER
, FTAG
);
1649 (void) dsl_dir_create_sync(dp
, dp
->dp_root_dir
,
1651 VERIFY0(dsl_pool_open_special_dir(dp
,
1652 LEAK_DIR_NAME
, &dp
->dp_leak_dir
));
1653 rrw_exit(&dp
->dp_config_rwlock
, FTAG
);
1655 dsl_dir_diduse_space(dp
->dp_leak_dir
, DD_USED_HEAD
,
1656 dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
,
1657 dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
,
1658 dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
, tx
);
1659 dsl_dir_diduse_space(dp
->dp_free_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
);
1664 if (dp
->dp_free_dir
!= NULL
&& !scn
->scn_async_destroying
) {
1665 /* finished; verify that space accounting went to zero */
1666 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_used_bytes
);
1667 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_compressed_bytes
);
1668 ASSERT0(dsl_dir_phys(dp
->dp_free_dir
)->dd_uncompressed_bytes
);
1671 if (scn
->scn_phys
.scn_state
!= DSS_SCANNING
)
1674 if (scn
->scn_done_txg
== tx
->tx_txg
) {
1675 ASSERT(!scn
->scn_pausing
);
1676 /* finished with scan. */
1677 zfs_dbgmsg("txg %llu scan complete", tx
->tx_txg
);
1678 dsl_scan_done(scn
, B_TRUE
, tx
);
1679 ASSERT3U(spa
->spa_scrub_inflight
, ==, 0);
1680 dsl_scan_sync_state(scn
, tx
);
1684 if (scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
<=
1685 scn
->scn_phys
.scn_ddt_class_max
) {
1686 zfs_dbgmsg("doing scan sync txg %llu; "
1687 "ddt bm=%llu/%llu/%llu/%llx",
1688 (longlong_t
)tx
->tx_txg
,
1689 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_class
,
1690 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_type
,
1691 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_checksum
,
1692 (longlong_t
)scn
->scn_phys
.scn_ddt_bookmark
.ddb_cursor
);
1693 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_objset
== 0);
1694 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_object
== 0);
1695 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_level
== 0);
1696 ASSERT(scn
->scn_phys
.scn_bookmark
.zb_blkid
== 0);
1698 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1699 (longlong_t
)tx
->tx_txg
,
1700 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_objset
,
1701 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_object
,
1702 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_level
,
1703 (longlong_t
)scn
->scn_phys
.scn_bookmark
.zb_blkid
);
1706 scn
->scn_zio_root
= zio_root(dp
->dp_spa
, NULL
,
1707 NULL
, ZIO_FLAG_CANFAIL
);
1708 dsl_pool_config_enter(dp
, FTAG
);
1709 dsl_scan_visit(scn
, tx
);
1710 dsl_pool_config_exit(dp
, FTAG
);
1711 (void) zio_wait(scn
->scn_zio_root
);
1712 scn
->scn_zio_root
= NULL
;
1714 zfs_dbgmsg("visited %llu blocks in %llums",
1715 (longlong_t
)scn
->scn_visited_this_txg
,
1716 (longlong_t
)NSEC2MSEC(gethrtime() - scn
->scn_sync_start_time
));
1718 if (!scn
->scn_pausing
) {
1719 scn
->scn_done_txg
= tx
->tx_txg
+ 1;
1720 zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
1721 tx
->tx_txg
, scn
->scn_done_txg
);
1724 if (DSL_SCAN_IS_SCRUB_RESILVER(scn
)) {
1725 mutex_enter(&spa
->spa_scrub_lock
);
1726 while (spa
->spa_scrub_inflight
> 0) {
1727 cv_wait(&spa
->spa_scrub_io_cv
,
1728 &spa
->spa_scrub_lock
);
1730 mutex_exit(&spa
->spa_scrub_lock
);
1733 dsl_scan_sync_state(scn
, tx
);
1737 * This will start a new scan, or restart an existing one.
1740 dsl_resilver_restart(dsl_pool_t
*dp
, uint64_t txg
)
1744 tx
= dmu_tx_create_dd(dp
->dp_mos_dir
);
1745 VERIFY(0 == dmu_tx_assign(tx
, TXG_WAIT
));
1747 txg
= dmu_tx_get_txg(tx
);
1748 dp
->dp_scan
->scn_restart_txg
= txg
;
1751 dp
->dp_scan
->scn_restart_txg
= txg
;
1753 zfs_dbgmsg("restarting resilver txg=%llu", txg
);
1757 dsl_scan_resilvering(dsl_pool_t
*dp
)
1759 return (dp
->dp_scan
->scn_phys
.scn_state
== DSS_SCANNING
&&
1760 dp
->dp_scan
->scn_phys
.scn_func
== POOL_SCAN_RESILVER
);
1768 count_block(zfs_all_blkstats_t
*zab
, const blkptr_t
*bp
)
1773 * If we resume after a reboot, zab will be NULL; don't record
1774 * incomplete stats in that case.
1779 for (i
= 0; i
< 4; i
++) {
1780 int l
= (i
< 2) ? BP_GET_LEVEL(bp
) : DN_MAX_LEVELS
;
1781 int t
= (i
& 1) ? BP_GET_TYPE(bp
) : DMU_OT_TOTAL
;
1785 if (t
& DMU_OT_NEWTYPE
)
1788 zb
= &zab
->zab_type
[l
][t
];
1790 zb
->zb_asize
+= BP_GET_ASIZE(bp
);
1791 zb
->zb_lsize
+= BP_GET_LSIZE(bp
);
1792 zb
->zb_psize
+= BP_GET_PSIZE(bp
);
1793 zb
->zb_gangs
+= BP_COUNT_GANG(bp
);
1795 switch (BP_GET_NDVAS(bp
)) {
1797 if (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1798 DVA_GET_VDEV(&bp
->blk_dva
[1]))
1799 zb
->zb_ditto_2_of_2_samevdev
++;
1802 equal
= (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1803 DVA_GET_VDEV(&bp
->blk_dva
[1])) +
1804 (DVA_GET_VDEV(&bp
->blk_dva
[0]) ==
1805 DVA_GET_VDEV(&bp
->blk_dva
[2])) +
1806 (DVA_GET_VDEV(&bp
->blk_dva
[1]) ==
1807 DVA_GET_VDEV(&bp
->blk_dva
[2]));
1809 zb
->zb_ditto_2_of_3_samevdev
++;
1810 else if (equal
== 3)
1811 zb
->zb_ditto_3_of_3_samevdev
++;
1818 dsl_scan_scrub_done(zio_t
*zio
)
1820 spa_t
*spa
= zio
->io_spa
;
1822 zio_data_buf_free(zio
->io_data
, zio
->io_size
);
1824 mutex_enter(&spa
->spa_scrub_lock
);
1825 spa
->spa_scrub_inflight
--;
1826 cv_broadcast(&spa
->spa_scrub_io_cv
);
1828 if (zio
->io_error
&& (zio
->io_error
!= ECKSUM
||
1829 !(zio
->io_flags
& ZIO_FLAG_SPECULATIVE
))) {
1830 spa
->spa_dsl_pool
->dp_scan
->scn_phys
.scn_errors
++;
1832 mutex_exit(&spa
->spa_scrub_lock
);
1836 dsl_scan_scrub_cb(dsl_pool_t
*dp
,
1837 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
1839 dsl_scan_t
*scn
= dp
->dp_scan
;
1840 size_t size
= BP_GET_PSIZE(bp
);
1841 spa_t
*spa
= dp
->dp_spa
;
1842 uint64_t phys_birth
= BP_PHYSICAL_BIRTH(bp
);
1843 boolean_t needs_io
= B_FALSE
;
1844 int zio_flags
= ZIO_FLAG_SCAN_THREAD
| ZIO_FLAG_RAW
| ZIO_FLAG_CANFAIL
;
1848 if (phys_birth
<= scn
->scn_phys
.scn_min_txg
||
1849 phys_birth
>= scn
->scn_phys
.scn_max_txg
)
1852 count_block(dp
->dp_blkstats
, bp
);
1854 if (BP_IS_EMBEDDED(bp
))
1857 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn
));
1858 if (scn
->scn_phys
.scn_func
== POOL_SCAN_SCRUB
) {
1859 zio_flags
|= ZIO_FLAG_SCRUB
;
1861 scan_delay
= zfs_scrub_delay
;
1863 ASSERT3U(scn
->scn_phys
.scn_func
, ==, POOL_SCAN_RESILVER
);
1864 zio_flags
|= ZIO_FLAG_RESILVER
;
1866 scan_delay
= zfs_resilver_delay
;
1869 /* If it's an intent log block, failure is expected. */
1870 if (zb
->zb_level
== ZB_ZIL_LEVEL
)
1871 zio_flags
|= ZIO_FLAG_SPECULATIVE
;
1873 for (d
= 0; d
< BP_GET_NDVAS(bp
); d
++) {
1874 vdev_t
*vd
= vdev_lookup_top(spa
,
1875 DVA_GET_VDEV(&bp
->blk_dva
[d
]));
1878 * Keep track of how much data we've examined so that
1879 * zpool(1M) status can make useful progress reports.
1881 scn
->scn_phys
.scn_examined
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1882 spa
->spa_scan_pass_exam
+= DVA_GET_ASIZE(&bp
->blk_dva
[d
]);
1884 /* if it's a resilver, this may not be in the target range */
1886 if (DVA_GET_GANG(&bp
->blk_dva
[d
])) {
1888 * Gang members may be spread across multiple
1889 * vdevs, so the best estimate we have is the
1890 * scrub range, which has already been checked.
1891 * XXX -- it would be better to change our
1892 * allocation policy to ensure that all
1893 * gang members reside on the same vdev.
1897 needs_io
= vdev_dtl_contains(vd
, DTL_PARTIAL
,
1903 if (needs_io
&& !zfs_no_scrub_io
) {
1904 vdev_t
*rvd
= spa
->spa_root_vdev
;
1905 uint64_t maxinflight
= rvd
->vdev_children
* zfs_top_maxinflight
;
1906 void *data
= zio_data_buf_alloc(size
);
1908 mutex_enter(&spa
->spa_scrub_lock
);
1909 while (spa
->spa_scrub_inflight
>= maxinflight
)
1910 cv_wait(&spa
->spa_scrub_io_cv
, &spa
->spa_scrub_lock
);
1911 spa
->spa_scrub_inflight
++;
1912 mutex_exit(&spa
->spa_scrub_lock
);
1915 * If we're seeing recent (zfs_scan_idle) "important" I/Os
1916 * then throttle our workload to limit the impact of a scan.
1918 if (ddi_get_lbolt64() - spa
->spa_last_io
<= zfs_scan_idle
)
1921 zio_nowait(zio_read(NULL
, spa
, bp
, data
, size
,
1922 dsl_scan_scrub_done
, NULL
, ZIO_PRIORITY_SCRUB
,
1926 /* do not relocate this block */
1931 dsl_scan(dsl_pool_t
*dp
, pool_scan_func_t func
)
1933 spa_t
*spa
= dp
->dp_spa
;
1936 * Purge all vdev caches and probe all devices. We do this here
1937 * rather than in sync context because this requires a writer lock
1938 * on the spa_config lock, which we can't do from sync context. The
1939 * spa_scrub_reopen flag indicates that vdev_open() should not
1940 * attempt to start another scrub.
1942 spa_vdev_state_enter(spa
, SCL_NONE
);
1943 spa
->spa_scrub_reopen
= B_TRUE
;
1944 vdev_reopen(spa
->spa_root_vdev
);
1945 spa
->spa_scrub_reopen
= B_FALSE
;
1946 (void) spa_vdev_state_exit(spa
, NULL
, 0);
1948 return (dsl_sync_task(spa_name(spa
), dsl_scan_setup_check
,
1949 dsl_scan_setup_sync
, &func
, 0, ZFS_SPACE_CHECK_NONE
));
1953 dsl_scan_restarting(dsl_scan_t
*scn
, dmu_tx_t
*tx
)
1955 return (scn
->scn_restart_txg
!= 0 &&
1956 scn
->scn_restart_txg
<= tx
->tx_txg
);
1959 #if defined(_KERNEL) && defined(HAVE_SPL)
1960 module_param(zfs_top_maxinflight
, int, 0644);
1961 MODULE_PARM_DESC(zfs_top_maxinflight
, "Max I/Os per top-level");
1963 module_param(zfs_resilver_delay
, int, 0644);
1964 MODULE_PARM_DESC(zfs_resilver_delay
, "Number of ticks to delay resilver");
1966 module_param(zfs_scrub_delay
, int, 0644);
1967 MODULE_PARM_DESC(zfs_scrub_delay
, "Number of ticks to delay scrub");
1969 module_param(zfs_scan_idle
, int, 0644);
1970 MODULE_PARM_DESC(zfs_scan_idle
, "Idle window in clock ticks");
1972 module_param(zfs_scan_min_time_ms
, int, 0644);
1973 MODULE_PARM_DESC(zfs_scan_min_time_ms
, "Min millisecs to scrub per txg");
1975 module_param(zfs_free_min_time_ms
, int, 0644);
1976 MODULE_PARM_DESC(zfs_free_min_time_ms
, "Min millisecs to free per txg");
1978 module_param(zfs_resilver_min_time_ms
, int, 0644);
1979 MODULE_PARM_DESC(zfs_resilver_min_time_ms
, "Min millisecs to resilver per txg");
1981 module_param(zfs_no_scrub_io
, int, 0644);
1982 MODULE_PARM_DESC(zfs_no_scrub_io
, "Set to disable scrub I/O");
1984 module_param(zfs_no_scrub_prefetch
, int, 0644);
1985 MODULE_PARM_DESC(zfs_no_scrub_prefetch
, "Set to disable scrub prefetching");
1987 module_param(zfs_free_max_blocks
, ulong
, 0644);
1988 MODULE_PARM_DESC(zfs_free_max_blocks
, "Max number of blocks freed in one txg");
1990 module_param(zfs_free_bpobj_enabled
, int, 0644);
1991 MODULE_PARM_DESC(zfs_free_bpobj_enabled
, "Enable processing of the free_bpobj");