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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
26 #include <sys/zfs_context.h>
27 #include <sys/dmu_objset.h>
28 #include <sys/dmu_traverse.h>
29 #include <sys/dsl_dataset.h>
30 #include <sys/dsl_dir.h>
31 #include <sys/dsl_pool.h>
32 #include <sys/dnode.h>
35 #include <sys/dmu_impl.h>
37 #include <sys/sa_impl.h>
38 #include <sys/callb.h>
39 #include <sys/zfeature.h>
41 int32_t zfs_pd_bytes_max
= 50 * 1024 * 1024; /* 50MB */
42 int32_t send_holes_without_birth_time
= 1;
44 typedef struct prefetch_data
{
47 int32_t pd_bytes_fetched
;
51 zbookmark_phys_t pd_resume
;
54 typedef struct traverse_data
{
59 zbookmark_phys_t
*td_resume
;
61 prefetch_data_t
*td_pfd
;
63 uint64_t td_hole_birth_enabled_txg
;
66 boolean_t td_realloc_possible
;
69 static int traverse_dnode(traverse_data_t
*td
, const dnode_phys_t
*dnp
,
70 uint64_t objset
, uint64_t object
);
71 static void prefetch_dnode_metadata(traverse_data_t
*td
, const dnode_phys_t
*,
72 uint64_t objset
, uint64_t object
);
75 traverse_zil_block(zilog_t
*zilog
, blkptr_t
*bp
, void *arg
, uint64_t claim_txg
)
77 traverse_data_t
*td
= arg
;
83 if (claim_txg
== 0 && bp
->blk_birth
>= spa_first_txg(td
->td_spa
))
86 SET_BOOKMARK(&zb
, td
->td_objset
, ZB_ZIL_OBJECT
, ZB_ZIL_LEVEL
,
87 bp
->blk_cksum
.zc_word
[ZIL_ZC_SEQ
]);
89 (void) td
->td_func(td
->td_spa
, zilog
, bp
, &zb
, NULL
, td
->td_arg
);
95 traverse_zil_record(zilog_t
*zilog
, lr_t
*lrc
, void *arg
, uint64_t claim_txg
)
97 traverse_data_t
*td
= arg
;
99 if (lrc
->lrc_txtype
== TX_WRITE
) {
100 lr_write_t
*lr
= (lr_write_t
*)lrc
;
101 blkptr_t
*bp
= &lr
->lr_blkptr
;
107 if (claim_txg
== 0 || bp
->blk_birth
< claim_txg
)
110 SET_BOOKMARK(&zb
, td
->td_objset
, lr
->lr_foid
,
111 ZB_ZIL_LEVEL
, lr
->lr_offset
/ BP_GET_LSIZE(bp
));
113 (void) td
->td_func(td
->td_spa
, zilog
, bp
, &zb
, NULL
,
120 traverse_zil(traverse_data_t
*td
, zil_header_t
*zh
)
122 uint64_t claim_txg
= zh
->zh_claim_txg
;
126 * We only want to visit blocks that have been claimed but not yet
127 * replayed; plus, in read-only mode, blocks that are already stable.
129 if (claim_txg
== 0 && spa_writeable(td
->td_spa
))
132 zilog
= zil_alloc(spa_get_dsl(td
->td_spa
)->dp_meta_objset
, zh
);
134 (void) zil_parse(zilog
, traverse_zil_block
, traverse_zil_record
, td
,
140 typedef enum resume_skip
{
147 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
148 * the block indicated by zb does not need to be visited at all. Returns
149 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
150 * resume point. This indicates that this block should be visited but not its
151 * children (since they must have been visited in a previous traversal).
152 * Otherwise returns RESUME_SKIP_NONE.
155 resume_skip_check(traverse_data_t
*td
, const dnode_phys_t
*dnp
,
156 const zbookmark_phys_t
*zb
)
158 if (td
->td_resume
!= NULL
&& !ZB_IS_ZERO(td
->td_resume
)) {
160 * If we already visited this bp & everything below,
161 * don't bother doing it again.
163 if (zbookmark_subtree_completed(dnp
, zb
, td
->td_resume
))
164 return (RESUME_SKIP_ALL
);
167 * If we found the block we're trying to resume from, zero
168 * the bookmark out to indicate that we have resumed.
170 if (bcmp(zb
, td
->td_resume
, sizeof (*zb
)) == 0) {
171 bzero(td
->td_resume
, sizeof (*zb
));
172 if (td
->td_flags
& TRAVERSE_POST
)
173 return (RESUME_SKIP_CHILDREN
);
176 return (RESUME_SKIP_NONE
);
180 traverse_prefetch_metadata(traverse_data_t
*td
,
181 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
183 arc_flags_t flags
= ARC_FLAG_NOWAIT
| ARC_FLAG_PREFETCH
;
185 if (!(td
->td_flags
& TRAVERSE_PREFETCH_METADATA
))
188 * If we are in the process of resuming, don't prefetch, because
189 * some children will not be needed (and in fact may have already
192 if (td
->td_resume
!= NULL
&& !ZB_IS_ZERO(td
->td_resume
))
194 if (BP_IS_HOLE(bp
) || bp
->blk_birth
<= td
->td_min_txg
)
196 if (BP_GET_LEVEL(bp
) == 0 && BP_GET_TYPE(bp
) != DMU_OT_DNODE
)
199 (void) arc_read(NULL
, td
->td_spa
, bp
, NULL
, NULL
,
200 ZIO_PRIORITY_ASYNC_READ
, ZIO_FLAG_CANFAIL
, &flags
, zb
);
204 prefetch_needed(prefetch_data_t
*pfd
, const blkptr_t
*bp
)
206 ASSERT(pfd
->pd_flags
& TRAVERSE_PREFETCH_DATA
);
207 if (BP_IS_HOLE(bp
) || BP_IS_EMBEDDED(bp
) ||
208 BP_GET_TYPE(bp
) == DMU_OT_INTENT_LOG
)
214 traverse_visitbp(traverse_data_t
*td
, const dnode_phys_t
*dnp
,
215 const blkptr_t
*bp
, const zbookmark_phys_t
*zb
)
218 arc_buf_t
*buf
= NULL
;
219 prefetch_data_t
*pd
= td
->td_pfd
;
221 switch (resume_skip_check(td
, dnp
, zb
)) {
222 case RESUME_SKIP_ALL
:
224 case RESUME_SKIP_CHILDREN
:
226 case RESUME_SKIP_NONE
:
232 if (bp
->blk_birth
== 0) {
234 * Since this block has a birth time of 0 it must be one of
235 * two things: a hole created before the
236 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
237 * which has always been a hole in an object.
239 * If a file is written sparsely, then the unwritten parts of
240 * the file were "always holes" -- that is, they have been
241 * holes since this object was allocated. However, we (and
242 * our callers) can not necessarily tell when an object was
243 * allocated. Therefore, if it's possible that this object
244 * was freed and then its object number reused, we need to
245 * visit all the holes with birth==0.
247 * If it isn't possible that the object number was reused,
248 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
249 * all the blocks we will visit as part of this traversal,
250 * then this hole must have always existed, so we can skip
251 * it. We visit blocks born after (exclusive) td_min_txg.
253 * Note that the meta-dnode cannot be reallocated.
255 if (!send_holes_without_birth_time
&&
256 (!td
->td_realloc_possible
||
257 zb
->zb_object
== DMU_META_DNODE_OBJECT
) &&
258 td
->td_hole_birth_enabled_txg
<= td
->td_min_txg
)
260 } else if (bp
->blk_birth
<= td
->td_min_txg
) {
264 if (pd
!= NULL
&& !pd
->pd_exited
&& prefetch_needed(pd
, bp
)) {
265 uint64_t size
= BP_GET_LSIZE(bp
);
266 mutex_enter(&pd
->pd_mtx
);
267 ASSERT(pd
->pd_bytes_fetched
>= 0);
268 while (pd
->pd_bytes_fetched
< size
&& !pd
->pd_exited
)
269 cv_wait_sig(&pd
->pd_cv
, &pd
->pd_mtx
);
270 pd
->pd_bytes_fetched
-= size
;
271 cv_broadcast(&pd
->pd_cv
);
272 mutex_exit(&pd
->pd_mtx
);
275 if (BP_IS_HOLE(bp
)) {
276 err
= td
->td_func(td
->td_spa
, NULL
, bp
, zb
, dnp
, td
->td_arg
);
282 if (td
->td_flags
& TRAVERSE_PRE
) {
283 err
= td
->td_func(td
->td_spa
, NULL
, bp
, zb
, dnp
,
285 if (err
== TRAVERSE_VISIT_NO_CHILDREN
)
291 if (BP_GET_LEVEL(bp
) > 0) {
292 uint32_t flags
= ARC_FLAG_WAIT
;
294 int32_t epb
= BP_GET_LSIZE(bp
) >> SPA_BLKPTRSHIFT
;
295 zbookmark_phys_t
*czb
;
297 err
= arc_read(NULL
, td
->td_spa
, bp
, arc_getbuf_func
, &buf
,
298 ZIO_PRIORITY_ASYNC_READ
, ZIO_FLAG_CANFAIL
, &flags
, zb
);
302 czb
= kmem_alloc(sizeof (zbookmark_phys_t
), KM_SLEEP
);
304 for (i
= 0; i
< epb
; i
++) {
305 SET_BOOKMARK(czb
, zb
->zb_objset
, zb
->zb_object
,
307 zb
->zb_blkid
* epb
+ i
);
308 traverse_prefetch_metadata(td
,
309 &((blkptr_t
*)buf
->b_data
)[i
], czb
);
312 /* recursively visitbp() blocks below this */
313 for (i
= 0; i
< epb
; i
++) {
314 SET_BOOKMARK(czb
, zb
->zb_objset
, zb
->zb_object
,
316 zb
->zb_blkid
* epb
+ i
);
317 err
= traverse_visitbp(td
, dnp
,
318 &((blkptr_t
*)buf
->b_data
)[i
], czb
);
323 kmem_free(czb
, sizeof (zbookmark_phys_t
));
325 } else if (BP_GET_TYPE(bp
) == DMU_OT_DNODE
) {
326 uint32_t flags
= ARC_FLAG_WAIT
;
328 int32_t epb
= BP_GET_LSIZE(bp
) >> DNODE_SHIFT
;
329 dnode_phys_t
*child_dnp
;
331 err
= arc_read(NULL
, td
->td_spa
, bp
, arc_getbuf_func
, &buf
,
332 ZIO_PRIORITY_ASYNC_READ
, ZIO_FLAG_CANFAIL
, &flags
, zb
);
335 child_dnp
= buf
->b_data
;
337 for (i
= 0; i
< epb
; i
+= child_dnp
[i
].dn_extra_slots
+ 1) {
338 prefetch_dnode_metadata(td
, &child_dnp
[i
],
339 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
);
342 /* recursively visitbp() blocks below this */
343 for (i
= 0; i
< epb
; i
+= child_dnp
[i
].dn_extra_slots
+ 1) {
344 err
= traverse_dnode(td
, &child_dnp
[i
],
345 zb
->zb_objset
, zb
->zb_blkid
* epb
+ i
);
349 } else if (BP_GET_TYPE(bp
) == DMU_OT_OBJSET
) {
350 arc_flags_t flags
= ARC_FLAG_WAIT
;
353 err
= arc_read(NULL
, td
->td_spa
, bp
, arc_getbuf_func
, &buf
,
354 ZIO_PRIORITY_ASYNC_READ
, ZIO_FLAG_CANFAIL
, &flags
, zb
);
359 prefetch_dnode_metadata(td
, &osp
->os_meta_dnode
, zb
->zb_objset
,
360 DMU_META_DNODE_OBJECT
);
362 * See the block comment above for the goal of this variable.
363 * If the maxblkid of the meta-dnode is 0, then we know that
364 * we've never had more than DNODES_PER_BLOCK objects in the
365 * dataset, which means we can't have reused any object ids.
367 if (osp
->os_meta_dnode
.dn_maxblkid
== 0)
368 td
->td_realloc_possible
= B_FALSE
;
370 if (arc_buf_size(buf
) >= sizeof (objset_phys_t
)) {
371 prefetch_dnode_metadata(td
, &osp
->os_groupused_dnode
,
372 zb
->zb_objset
, DMU_GROUPUSED_OBJECT
);
373 prefetch_dnode_metadata(td
, &osp
->os_userused_dnode
,
374 zb
->zb_objset
, DMU_USERUSED_OBJECT
);
377 err
= traverse_dnode(td
, &osp
->os_meta_dnode
, zb
->zb_objset
,
378 DMU_META_DNODE_OBJECT
);
379 if (err
== 0 && arc_buf_size(buf
) >= sizeof (objset_phys_t
)) {
380 err
= traverse_dnode(td
, &osp
->os_groupused_dnode
,
381 zb
->zb_objset
, DMU_GROUPUSED_OBJECT
);
383 if (err
== 0 && arc_buf_size(buf
) >= sizeof (objset_phys_t
)) {
384 err
= traverse_dnode(td
, &osp
->os_userused_dnode
,
385 zb
->zb_objset
, DMU_USERUSED_OBJECT
);
390 arc_buf_destroy(buf
, &buf
);
393 if (err
== 0 && (td
->td_flags
& TRAVERSE_POST
))
394 err
= td
->td_func(td
->td_spa
, NULL
, bp
, zb
, dnp
, td
->td_arg
);
396 if ((td
->td_flags
& TRAVERSE_HARD
) && (err
== EIO
|| err
== ECKSUM
)) {
398 * Ignore this disk error as requested by the HARD flag,
399 * and continue traversal.
405 * If we are stopping here, set td_resume.
407 if (td
->td_resume
!= NULL
&& err
!= 0 && !td
->td_paused
) {
408 td
->td_resume
->zb_objset
= zb
->zb_objset
;
409 td
->td_resume
->zb_object
= zb
->zb_object
;
410 td
->td_resume
->zb_level
= 0;
412 * If we have stopped on an indirect block (e.g. due to
413 * i/o error), we have not visited anything below it.
414 * Set the bookmark to the first level-0 block that we need
415 * to visit. This way, the resuming code does not need to
416 * deal with resuming from indirect blocks.
418 * Note, if zb_level <= 0, dnp may be NULL, so we don't want
421 td
->td_resume
->zb_blkid
= zb
->zb_blkid
;
422 if (zb
->zb_level
> 0) {
423 td
->td_resume
->zb_blkid
<<= zb
->zb_level
*
424 (dnp
->dn_indblkshift
- SPA_BLKPTRSHIFT
);
426 td
->td_paused
= B_TRUE
;
433 prefetch_dnode_metadata(traverse_data_t
*td
, const dnode_phys_t
*dnp
,
434 uint64_t objset
, uint64_t object
)
437 zbookmark_phys_t czb
;
439 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
440 SET_BOOKMARK(&czb
, objset
, object
, dnp
->dn_nlevels
- 1, j
);
441 traverse_prefetch_metadata(td
, &dnp
->dn_blkptr
[j
], &czb
);
444 if (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
) {
445 SET_BOOKMARK(&czb
, objset
, object
, 0, DMU_SPILL_BLKID
);
446 traverse_prefetch_metadata(td
, DN_SPILL_BLKPTR(dnp
), &czb
);
451 traverse_dnode(traverse_data_t
*td
, const dnode_phys_t
*dnp
,
452 uint64_t objset
, uint64_t object
)
455 zbookmark_phys_t czb
;
457 if (object
!= DMU_META_DNODE_OBJECT
&& td
->td_resume
!= NULL
&&
458 object
< td
->td_resume
->zb_object
)
461 if (td
->td_flags
& TRAVERSE_PRE
) {
462 SET_BOOKMARK(&czb
, objset
, object
, ZB_DNODE_LEVEL
,
464 err
= td
->td_func(td
->td_spa
, NULL
, NULL
, &czb
, dnp
,
466 if (err
== TRAVERSE_VISIT_NO_CHILDREN
)
472 for (j
= 0; j
< dnp
->dn_nblkptr
; j
++) {
473 SET_BOOKMARK(&czb
, objset
, object
, dnp
->dn_nlevels
- 1, j
);
474 err
= traverse_visitbp(td
, dnp
, &dnp
->dn_blkptr
[j
], &czb
);
479 if (err
== 0 && (dnp
->dn_flags
& DNODE_FLAG_SPILL_BLKPTR
)) {
480 SET_BOOKMARK(&czb
, objset
, object
, 0, DMU_SPILL_BLKID
);
481 err
= traverse_visitbp(td
, dnp
, DN_SPILL_BLKPTR(dnp
), &czb
);
484 if (err
== 0 && (td
->td_flags
& TRAVERSE_POST
)) {
485 SET_BOOKMARK(&czb
, objset
, object
, ZB_DNODE_LEVEL
,
487 err
= td
->td_func(td
->td_spa
, NULL
, NULL
, &czb
, dnp
,
489 if (err
== TRAVERSE_VISIT_NO_CHILDREN
)
499 traverse_prefetcher(spa_t
*spa
, zilog_t
*zilog
, const blkptr_t
*bp
,
500 const zbookmark_phys_t
*zb
, const dnode_phys_t
*dnp
, void *arg
)
502 prefetch_data_t
*pfd
= arg
;
503 arc_flags_t aflags
= ARC_FLAG_NOWAIT
| ARC_FLAG_PREFETCH
;
505 ASSERT(pfd
->pd_bytes_fetched
>= 0);
509 return (SET_ERROR(EINTR
));
511 if (!prefetch_needed(pfd
, bp
))
514 mutex_enter(&pfd
->pd_mtx
);
515 while (!pfd
->pd_cancel
&& pfd
->pd_bytes_fetched
>= zfs_pd_bytes_max
)
516 cv_wait_sig(&pfd
->pd_cv
, &pfd
->pd_mtx
);
517 pfd
->pd_bytes_fetched
+= BP_GET_LSIZE(bp
);
518 cv_broadcast(&pfd
->pd_cv
);
519 mutex_exit(&pfd
->pd_mtx
);
521 (void) arc_read(NULL
, spa
, bp
, NULL
, NULL
, ZIO_PRIORITY_ASYNC_READ
,
522 ZIO_FLAG_CANFAIL
| ZIO_FLAG_SPECULATIVE
, &aflags
, zb
);
528 traverse_prefetch_thread(void *arg
)
530 traverse_data_t
*td_main
= arg
;
531 traverse_data_t td
= *td_main
;
532 zbookmark_phys_t czb
;
533 fstrans_cookie_t cookie
= spl_fstrans_mark();
535 td
.td_func
= traverse_prefetcher
;
536 td
.td_arg
= td_main
->td_pfd
;
538 td
.td_resume
= &td_main
->td_pfd
->pd_resume
;
540 SET_BOOKMARK(&czb
, td
.td_objset
,
541 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
542 (void) traverse_visitbp(&td
, NULL
, td
.td_rootbp
, &czb
);
544 mutex_enter(&td_main
->td_pfd
->pd_mtx
);
545 td_main
->td_pfd
->pd_exited
= B_TRUE
;
546 cv_broadcast(&td_main
->td_pfd
->pd_cv
);
547 mutex_exit(&td_main
->td_pfd
->pd_mtx
);
548 spl_fstrans_unmark(cookie
);
552 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
553 * in syncing context).
556 traverse_impl(spa_t
*spa
, dsl_dataset_t
*ds
, uint64_t objset
, blkptr_t
*rootbp
,
557 uint64_t txg_start
, zbookmark_phys_t
*resume
, int flags
,
558 blkptr_cb_t func
, void *arg
)
562 zbookmark_phys_t
*czb
;
565 ASSERT(ds
== NULL
|| objset
== ds
->ds_object
);
566 ASSERT(!(flags
& TRAVERSE_PRE
) || !(flags
& TRAVERSE_POST
));
568 td
= kmem_alloc(sizeof (traverse_data_t
), KM_SLEEP
);
569 pd
= kmem_zalloc(sizeof (prefetch_data_t
), KM_SLEEP
);
570 czb
= kmem_alloc(sizeof (zbookmark_phys_t
), KM_SLEEP
);
573 td
->td_objset
= objset
;
574 td
->td_rootbp
= rootbp
;
575 td
->td_min_txg
= txg_start
;
576 td
->td_resume
= resume
;
580 td
->td_flags
= flags
;
581 td
->td_paused
= B_FALSE
;
582 td
->td_realloc_possible
= (txg_start
== 0 ? B_FALSE
: B_TRUE
);
584 if (spa_feature_is_active(spa
, SPA_FEATURE_HOLE_BIRTH
)) {
585 VERIFY(spa_feature_enabled_txg(spa
,
586 SPA_FEATURE_HOLE_BIRTH
, &td
->td_hole_birth_enabled_txg
));
588 td
->td_hole_birth_enabled_txg
= UINT64_MAX
;
591 pd
->pd_flags
= flags
;
593 pd
->pd_resume
= *resume
;
594 mutex_init(&pd
->pd_mtx
, NULL
, MUTEX_DEFAULT
, NULL
);
595 cv_init(&pd
->pd_cv
, NULL
, CV_DEFAULT
, NULL
);
597 SET_BOOKMARK(czb
, td
->td_objset
,
598 ZB_ROOT_OBJECT
, ZB_ROOT_LEVEL
, ZB_ROOT_BLKID
);
600 /* See comment on ZIL traversal in dsl_scan_visitds. */
601 if (ds
!= NULL
&& !ds
->ds_is_snapshot
&& !BP_IS_HOLE(rootbp
)) {
602 uint32_t flags
= ARC_FLAG_WAIT
;
606 err
= arc_read(NULL
, td
->td_spa
, rootbp
,
607 arc_getbuf_func
, &buf
,
608 ZIO_PRIORITY_ASYNC_READ
, ZIO_FLAG_CANFAIL
, &flags
, czb
);
613 traverse_zil(td
, &osp
->os_zil_header
);
614 arc_buf_destroy(buf
, &buf
);
617 if (!(flags
& TRAVERSE_PREFETCH_DATA
) ||
618 taskq_dispatch(system_taskq
, traverse_prefetch_thread
,
619 td
, TQ_NOQUEUE
) == TASKQID_INVALID
)
620 pd
->pd_exited
= B_TRUE
;
622 err
= traverse_visitbp(td
, NULL
, rootbp
, czb
);
624 mutex_enter(&pd
->pd_mtx
);
625 pd
->pd_cancel
= B_TRUE
;
626 cv_broadcast(&pd
->pd_cv
);
627 while (!pd
->pd_exited
)
628 cv_wait_sig(&pd
->pd_cv
, &pd
->pd_mtx
);
629 mutex_exit(&pd
->pd_mtx
);
631 mutex_destroy(&pd
->pd_mtx
);
632 cv_destroy(&pd
->pd_cv
);
634 kmem_free(czb
, sizeof (zbookmark_phys_t
));
635 kmem_free(pd
, sizeof (struct prefetch_data
));
636 kmem_free(td
, sizeof (struct traverse_data
));
642 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
643 * in syncing context).
646 traverse_dataset_resume(dsl_dataset_t
*ds
, uint64_t txg_start
,
647 zbookmark_phys_t
*resume
,
648 int flags
, blkptr_cb_t func
, void *arg
)
650 return (traverse_impl(ds
->ds_dir
->dd_pool
->dp_spa
, ds
, ds
->ds_object
,
651 &dsl_dataset_phys(ds
)->ds_bp
, txg_start
, resume
, flags
, func
, arg
));
655 traverse_dataset(dsl_dataset_t
*ds
, uint64_t txg_start
,
656 int flags
, blkptr_cb_t func
, void *arg
)
658 return (traverse_dataset_resume(ds
, txg_start
, NULL
, flags
, func
, arg
));
662 traverse_dataset_destroyed(spa_t
*spa
, blkptr_t
*blkptr
,
663 uint64_t txg_start
, zbookmark_phys_t
*resume
, int flags
,
664 blkptr_cb_t func
, void *arg
)
666 return (traverse_impl(spa
, NULL
, ZB_DESTROYED_OBJSET
,
667 blkptr
, txg_start
, resume
, flags
, func
, arg
));
671 * NB: pool must not be changing on-disk (eg, from zdb or sync context).
674 traverse_pool(spa_t
*spa
, uint64_t txg_start
, int flags
,
675 blkptr_cb_t func
, void *arg
)
679 dsl_pool_t
*dp
= spa_get_dsl(spa
);
680 objset_t
*mos
= dp
->dp_meta_objset
;
681 boolean_t hard
= (flags
& TRAVERSE_HARD
);
684 err
= traverse_impl(spa
, NULL
, 0, spa_get_rootblkptr(spa
),
685 txg_start
, NULL
, flags
, func
, arg
);
689 /* visit each dataset */
690 for (obj
= 1; err
== 0;
691 err
= dmu_object_next(mos
, &obj
, B_FALSE
, txg_start
)) {
692 dmu_object_info_t doi
;
694 err
= dmu_object_info(mos
, obj
, &doi
);
701 if (doi
.doi_bonus_type
== DMU_OT_DSL_DATASET
) {
703 uint64_t txg
= txg_start
;
705 dsl_pool_config_enter(dp
, FTAG
);
706 err
= dsl_dataset_hold_obj(dp
, obj
, FTAG
, &ds
);
707 dsl_pool_config_exit(dp
, FTAG
);
713 if (dsl_dataset_phys(ds
)->ds_prev_snap_txg
> txg
)
714 txg
= dsl_dataset_phys(ds
)->ds_prev_snap_txg
;
715 err
= traverse_dataset(ds
, txg
, flags
, func
, arg
);
716 dsl_dataset_rele(ds
, FTAG
);
726 #if defined(_KERNEL) && defined(HAVE_SPL)
727 EXPORT_SYMBOL(traverse_dataset
);
728 EXPORT_SYMBOL(traverse_pool
);
730 module_param(zfs_pd_bytes_max
, int, 0644);
731 MODULE_PARM_DESC(zfs_pd_bytes_max
, "Max number of bytes to prefetch");
733 module_param_named(ignore_hole_birth
, send_holes_without_birth_time
, int, 0644);
734 MODULE_PARM_DESC(ignore_hole_birth
, "Alias for send_holes_without_birth_time");
736 module_param_named(send_holes_without_birth_time
,
737 send_holes_without_birth_time
, int, 0644);
738 MODULE_PARM_DESC(send_holes_without_birth_time
,
739 "Ignore hole_birth txg for zfs send");