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, 2018 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>
34 #include <sys/spa_impl.h>
36 #include <sys/dmu_impl.h>
38 #include <sys/sa_impl.h>
39 #include <sys/callb.h>
40 #include <sys/zfeature.h>
42 int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
43 int32_t send_holes_without_birth_time = 1;
45 typedef struct prefetch_data {
48 int32_t pd_bytes_fetched;
52 zbookmark_phys_t pd_resume;
55 typedef struct traverse_data {
60 zbookmark_phys_t *td_resume;
62 prefetch_data_t *td_pfd;
64 uint64_t td_hole_birth_enabled_txg;
67 boolean_t td_realloc_possible;
70 static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
71 uint64_t objset, uint64_t object);
72 static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *,
73 uint64_t objset, uint64_t object);
76 traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
78 traverse_data_t *td = arg;
84 if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa))
87 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
88 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
90 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg);
96 traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
98 traverse_data_t *td = arg;
100 if (lrc->lrc_txtype == TX_WRITE) {
101 lr_write_t *lr = (lr_write_t *)lrc;
102 blkptr_t *bp = &lr->lr_blkptr;
108 if (claim_txg == 0 || bp->blk_birth < claim_txg)
111 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid,
112 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
114 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL,
121 traverse_zil(traverse_data_t *td, zil_header_t *zh)
123 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 blocks that are already stable in read-only mode.
129 if (claim_txg == 0 && spa_writeable(td->td_spa))
132 zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh);
133 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td,
134 claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT));
138 typedef enum resume_skip {
145 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
146 * the block indicated by zb does not need to be visited at all. Returns
147 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
148 * resume point. This indicates that this block should be visited but not its
149 * children (since they must have been visited in a previous traversal).
150 * Otherwise returns RESUME_SKIP_NONE.
153 resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp,
154 const zbookmark_phys_t *zb)
156 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) {
158 * If we already visited this bp & everything below,
159 * don't bother doing it again.
161 if (zbookmark_subtree_completed(dnp, zb, td->td_resume))
162 return (RESUME_SKIP_ALL);
165 * If we found the block we're trying to resume from, zero
166 * the bookmark out to indicate that we have resumed.
168 if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) {
169 bzero(td->td_resume, sizeof (*zb));
170 if (td->td_flags & TRAVERSE_POST)
171 return (RESUME_SKIP_CHILDREN);
174 return (RESUME_SKIP_NONE);
178 traverse_prefetch_metadata(traverse_data_t *td,
179 const blkptr_t *bp, const zbookmark_phys_t *zb)
181 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
182 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
184 if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA))
187 * If we are in the process of resuming, don't prefetch, because
188 * some children will not be needed (and in fact may have already
191 if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume))
193 if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg)
195 if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)
198 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
199 zio_flags |= ZIO_FLAG_RAW;
201 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL,
202 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
206 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
208 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
209 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
210 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG)
216 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
217 const blkptr_t *bp, const zbookmark_phys_t *zb)
220 arc_buf_t *buf = NULL;
221 prefetch_data_t *pd = td->td_pfd;
223 switch (resume_skip_check(td, dnp, zb)) {
224 case RESUME_SKIP_ALL:
226 case RESUME_SKIP_CHILDREN:
228 case RESUME_SKIP_NONE:
234 if (bp->blk_birth == 0) {
236 * Since this block has a birth time of 0 it must be one of
237 * two things: a hole created before the
238 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
239 * which has always been a hole in an object.
241 * If a file is written sparsely, then the unwritten parts of
242 * the file were "always holes" -- that is, they have been
243 * holes since this object was allocated. However, we (and
244 * our callers) can not necessarily tell when an object was
245 * allocated. Therefore, if it's possible that this object
246 * was freed and then its object number reused, we need to
247 * visit all the holes with birth==0.
249 * If it isn't possible that the object number was reused,
250 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
251 * all the blocks we will visit as part of this traversal,
252 * then this hole must have always existed, so we can skip
253 * it. We visit blocks born after (exclusive) td_min_txg.
255 * Note that the meta-dnode cannot be reallocated.
257 if (!send_holes_without_birth_time &&
258 (!td->td_realloc_possible ||
259 zb->zb_object == DMU_META_DNODE_OBJECT) &&
260 td->td_hole_birth_enabled_txg <= td->td_min_txg)
262 } else if (bp->blk_birth <= td->td_min_txg) {
266 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
267 uint64_t size = BP_GET_LSIZE(bp);
268 mutex_enter(&pd->pd_mtx);
269 ASSERT(pd->pd_bytes_fetched >= 0);
270 while (pd->pd_bytes_fetched < size && !pd->pd_exited)
271 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
272 pd->pd_bytes_fetched -= size;
273 cv_broadcast(&pd->pd_cv);
274 mutex_exit(&pd->pd_mtx);
277 if (BP_IS_HOLE(bp)) {
278 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
284 if (td->td_flags & TRAVERSE_PRE) {
285 err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
287 if (err == TRAVERSE_VISIT_NO_CHILDREN)
293 if (BP_GET_LEVEL(bp) > 0) {
294 uint32_t flags = ARC_FLAG_WAIT;
296 int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
297 zbookmark_phys_t *czb;
299 ASSERT(!BP_IS_PROTECTED(bp));
301 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
302 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
306 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
308 for (i = 0; i < epb; i++) {
309 SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
311 zb->zb_blkid * epb + i);
312 traverse_prefetch_metadata(td,
313 &((blkptr_t *)buf->b_data)[i], czb);
316 /* recursively visitbp() blocks below this */
317 for (i = 0; i < epb; i++) {
318 SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
320 zb->zb_blkid * epb + i);
321 err = traverse_visitbp(td, dnp,
322 &((blkptr_t *)buf->b_data)[i], czb);
327 kmem_free(czb, sizeof (zbookmark_phys_t));
329 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
330 uint32_t flags = ARC_FLAG_WAIT;
331 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
333 int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
334 dnode_phys_t *child_dnp;
337 * dnode blocks might have their bonus buffers encrypted, so
338 * we must be careful to honor TRAVERSE_NO_DECRYPT
340 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
341 zio_flags |= ZIO_FLAG_RAW;
343 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
344 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
348 child_dnp = buf->b_data;
350 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
351 prefetch_dnode_metadata(td, &child_dnp[i],
352 zb->zb_objset, zb->zb_blkid * epb + i);
355 /* recursively visitbp() blocks below this */
356 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
357 err = traverse_dnode(td, &child_dnp[i],
358 zb->zb_objset, zb->zb_blkid * epb + i);
362 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
363 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
364 arc_flags_t flags = ARC_FLAG_WAIT;
367 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
368 zio_flags |= ZIO_FLAG_RAW;
370 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
371 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
376 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset,
377 DMU_META_DNODE_OBJECT);
379 * See the block comment above for the goal of this variable.
380 * If the maxblkid of the meta-dnode is 0, then we know that
381 * we've never had more than DNODES_PER_BLOCK objects in the
382 * dataset, which means we can't have reused any object ids.
384 if (osp->os_meta_dnode.dn_maxblkid == 0)
385 td->td_realloc_possible = B_FALSE;
387 if (OBJSET_BUF_HAS_USERUSED(buf)) {
388 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
389 prefetch_dnode_metadata(td,
390 &osp->os_projectused_dnode,
391 zb->zb_objset, DMU_PROJECTUSED_OBJECT);
392 prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
393 zb->zb_objset, DMU_GROUPUSED_OBJECT);
394 prefetch_dnode_metadata(td, &osp->os_userused_dnode,
395 zb->zb_objset, DMU_USERUSED_OBJECT);
398 err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset,
399 DMU_META_DNODE_OBJECT);
400 if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) {
401 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
402 err = traverse_dnode(td,
403 &osp->os_projectused_dnode, zb->zb_objset,
404 DMU_PROJECTUSED_OBJECT);
406 err = traverse_dnode(td,
407 &osp->os_groupused_dnode, zb->zb_objset,
408 DMU_GROUPUSED_OBJECT);
410 err = traverse_dnode(td,
411 &osp->os_userused_dnode, zb->zb_objset,
412 DMU_USERUSED_OBJECT);
417 arc_buf_destroy(buf, &buf);
420 if (err == 0 && (td->td_flags & TRAVERSE_POST))
421 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
423 if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) {
425 * Ignore this disk error as requested by the HARD flag,
426 * and continue traversal.
432 * If we are stopping here, set td_resume.
434 if (td->td_resume != NULL && err != 0 && !td->td_paused) {
435 td->td_resume->zb_objset = zb->zb_objset;
436 td->td_resume->zb_object = zb->zb_object;
437 td->td_resume->zb_level = 0;
439 * If we have stopped on an indirect block (e.g. due to
440 * i/o error), we have not visited anything below it.
441 * Set the bookmark to the first level-0 block that we need
442 * to visit. This way, the resuming code does not need to
443 * deal with resuming from indirect blocks.
445 * Note, if zb_level <= 0, dnp may be NULL, so we don't want
448 td->td_resume->zb_blkid = zb->zb_blkid;
449 if (zb->zb_level > 0) {
450 td->td_resume->zb_blkid <<= zb->zb_level *
451 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT);
453 td->td_paused = B_TRUE;
460 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
461 uint64_t objset, uint64_t object)
464 zbookmark_phys_t czb;
466 for (j = 0; j < dnp->dn_nblkptr; j++) {
467 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
468 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb);
471 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
472 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
473 traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb);
478 traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp,
479 uint64_t objset, uint64_t object)
482 zbookmark_phys_t czb;
484 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL &&
485 object < td->td_resume->zb_object)
488 if (td->td_flags & TRAVERSE_PRE) {
489 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
491 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
493 if (err == TRAVERSE_VISIT_NO_CHILDREN)
499 for (j = 0; j < dnp->dn_nblkptr; j++) {
500 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
501 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
506 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
507 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
508 err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
511 if (err == 0 && (td->td_flags & TRAVERSE_POST)) {
512 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
514 err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp,
516 if (err == TRAVERSE_VISIT_NO_CHILDREN)
526 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
527 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
529 prefetch_data_t *pfd = arg;
530 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
531 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
532 ARC_FLAG_PRESCIENT_PREFETCH;
534 ASSERT(pfd->pd_bytes_fetched >= 0);
538 return (SET_ERROR(EINTR));
540 if (!prefetch_needed(pfd, bp))
543 mutex_enter(&pfd->pd_mtx);
544 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max)
545 cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx);
546 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp);
547 cv_broadcast(&pfd->pd_cv);
548 mutex_exit(&pfd->pd_mtx);
550 if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
551 zio_flags |= ZIO_FLAG_RAW;
553 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
554 zio_flags, &aflags, zb);
560 traverse_prefetch_thread(void *arg)
562 traverse_data_t *td_main = arg;
563 traverse_data_t td = *td_main;
564 zbookmark_phys_t czb;
565 fstrans_cookie_t cookie = spl_fstrans_mark();
567 td.td_func = traverse_prefetcher;
568 td.td_arg = td_main->td_pfd;
570 td.td_resume = &td_main->td_pfd->pd_resume;
572 SET_BOOKMARK(&czb, td.td_objset,
573 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
574 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb);
576 mutex_enter(&td_main->td_pfd->pd_mtx);
577 td_main->td_pfd->pd_exited = B_TRUE;
578 cv_broadcast(&td_main->td_pfd->pd_cv);
579 mutex_exit(&td_main->td_pfd->pd_mtx);
580 spl_fstrans_unmark(cookie);
584 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
585 * in syncing context).
588 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
589 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
590 blkptr_cb_t func, void *arg)
594 zbookmark_phys_t *czb;
597 ASSERT(ds == NULL || objset == ds->ds_object);
598 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
600 td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP);
601 pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP);
602 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
605 td->td_objset = objset;
606 td->td_rootbp = rootbp;
607 td->td_min_txg = txg_start;
608 td->td_resume = resume;
612 td->td_flags = flags;
613 td->td_paused = B_FALSE;
614 td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE);
616 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
617 VERIFY(spa_feature_enabled_txg(spa,
618 SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg));
620 td->td_hole_birth_enabled_txg = UINT64_MAX;
623 pd->pd_flags = flags;
625 pd->pd_resume = *resume;
626 mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL);
627 cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL);
629 SET_BOOKMARK(czb, td->td_objset,
630 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
632 /* See comment on ZIL traversal in dsl_scan_visitds. */
633 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
634 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
635 uint32_t flags = ARC_FLAG_WAIT;
639 if ((td->td_flags & TRAVERSE_NO_DECRYPT) &&
640 BP_IS_PROTECTED(rootbp))
641 zio_flags |= ZIO_FLAG_RAW;
643 err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func,
644 &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb);
647 * If both TRAVERSE_HARD and TRAVERSE_PRE are set,
648 * continue to visitbp so that td_func can be called
649 * in pre stage, and err will reset to zero.
651 if (!(td->td_flags & TRAVERSE_HARD) ||
652 !(td->td_flags & TRAVERSE_PRE))
656 traverse_zil(td, &osp->os_zil_header);
657 arc_buf_destroy(buf, &buf);
661 if (!(flags & TRAVERSE_PREFETCH_DATA) ||
662 taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread,
663 td, TQ_NOQUEUE) == TASKQID_INVALID)
664 pd->pd_exited = B_TRUE;
666 err = traverse_visitbp(td, NULL, rootbp, czb);
668 mutex_enter(&pd->pd_mtx);
669 pd->pd_cancel = B_TRUE;
670 cv_broadcast(&pd->pd_cv);
671 while (!pd->pd_exited)
672 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
673 mutex_exit(&pd->pd_mtx);
675 mutex_destroy(&pd->pd_mtx);
676 cv_destroy(&pd->pd_cv);
678 kmem_free(czb, sizeof (zbookmark_phys_t));
679 kmem_free(pd, sizeof (struct prefetch_data));
680 kmem_free(td, sizeof (struct traverse_data));
686 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
687 * in syncing context).
690 traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start,
691 zbookmark_phys_t *resume,
692 int flags, blkptr_cb_t func, void *arg)
694 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
695 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg));
699 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start,
700 int flags, blkptr_cb_t func, void *arg)
702 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg));
706 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
707 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
708 blkptr_cb_t func, void *arg)
710 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
711 blkptr, txg_start, resume, flags, func, arg));
715 * NB: pool must not be changing on-disk (eg, from zdb or sync context).
718 traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
719 blkptr_cb_t func, void *arg)
722 dsl_pool_t *dp = spa_get_dsl(spa);
723 objset_t *mos = dp->dp_meta_objset;
724 boolean_t hard = (flags & TRAVERSE_HARD);
727 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
728 txg_start, NULL, flags, func, arg);
732 /* visit each dataset */
733 for (uint64_t obj = 1; err == 0;
734 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) {
735 dmu_object_info_t doi;
737 err = dmu_object_info(mos, obj, &doi);
744 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
746 uint64_t txg = txg_start;
748 dsl_pool_config_enter(dp, FTAG);
749 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
750 dsl_pool_config_exit(dp, FTAG);
756 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
757 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
758 err = traverse_dataset(ds, txg, flags, func, arg);
759 dsl_dataset_rele(ds, FTAG);
770 EXPORT_SYMBOL(traverse_dataset);
771 EXPORT_SYMBOL(traverse_pool);
773 module_param(zfs_pd_bytes_max, int, 0644);
774 MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
776 module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
777 MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time");
779 module_param_named(send_holes_without_birth_time,
780 send_holes_without_birth_time, int, 0644);
781 MODULE_PARM_DESC(send_holes_without_birth_time,
782 "Ignore hole_birth txg for zfs send");