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 blkptr_t *bp,
71 const dnode_phys_t *dnp, 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)
197 ASSERT(!BP_IS_REDACTED(bp));
199 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
200 zio_flags |= ZIO_FLAG_RAW;
202 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL,
203 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
207 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
209 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
210 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
211 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG || BP_IS_REDACTED(bp))
217 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
218 const blkptr_t *bp, const zbookmark_phys_t *zb)
221 arc_buf_t *buf = NULL;
222 prefetch_data_t *pd = td->td_pfd;
224 switch (resume_skip_check(td, dnp, zb)) {
225 case RESUME_SKIP_ALL:
227 case RESUME_SKIP_CHILDREN:
229 case RESUME_SKIP_NONE:
235 if (bp->blk_birth == 0) {
237 * Since this block has a birth time of 0 it must be one of
238 * two things: a hole created before the
239 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
240 * which has always been a hole in an object.
242 * If a file is written sparsely, then the unwritten parts of
243 * the file were "always holes" -- that is, they have been
244 * holes since this object was allocated. However, we (and
245 * our callers) can not necessarily tell when an object was
246 * allocated. Therefore, if it's possible that this object
247 * was freed and then its object number reused, we need to
248 * visit all the holes with birth==0.
250 * If it isn't possible that the object number was reused,
251 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
252 * all the blocks we will visit as part of this traversal,
253 * then this hole must have always existed, so we can skip
254 * it. We visit blocks born after (exclusive) td_min_txg.
256 * Note that the meta-dnode cannot be reallocated.
258 if (!send_holes_without_birth_time &&
259 (!td->td_realloc_possible ||
260 zb->zb_object == DMU_META_DNODE_OBJECT) &&
261 td->td_hole_birth_enabled_txg <= td->td_min_txg)
263 } else if (bp->blk_birth <= td->td_min_txg) {
267 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
268 uint64_t size = BP_GET_LSIZE(bp);
269 mutex_enter(&pd->pd_mtx);
270 ASSERT(pd->pd_bytes_fetched >= 0);
271 while (pd->pd_bytes_fetched < size && !pd->pd_exited)
272 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
273 pd->pd_bytes_fetched -= size;
274 cv_broadcast(&pd->pd_cv);
275 mutex_exit(&pd->pd_mtx);
278 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) {
279 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
285 if (td->td_flags & TRAVERSE_PRE) {
286 err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
288 if (err == TRAVERSE_VISIT_NO_CHILDREN)
294 if (BP_GET_LEVEL(bp) > 0) {
295 uint32_t flags = ARC_FLAG_WAIT;
297 int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
298 zbookmark_phys_t *czb;
300 ASSERT(!BP_IS_PROTECTED(bp));
302 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
303 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
307 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
309 for (i = 0; i < epb; i++) {
310 SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
312 zb->zb_blkid * epb + i);
313 traverse_prefetch_metadata(td,
314 &((blkptr_t *)buf->b_data)[i], czb);
317 /* recursively visitbp() blocks below this */
318 for (i = 0; i < epb; i++) {
319 SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
321 zb->zb_blkid * epb + i);
322 err = traverse_visitbp(td, dnp,
323 &((blkptr_t *)buf->b_data)[i], czb);
328 kmem_free(czb, sizeof (zbookmark_phys_t));
330 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
331 uint32_t flags = ARC_FLAG_WAIT;
332 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
334 int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
335 dnode_phys_t *child_dnp;
338 * dnode blocks might have their bonus buffers encrypted, so
339 * we must be careful to honor TRAVERSE_NO_DECRYPT
341 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
342 zio_flags |= ZIO_FLAG_RAW;
344 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
345 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
349 child_dnp = buf->b_data;
351 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
352 prefetch_dnode_metadata(td, &child_dnp[i],
353 zb->zb_objset, zb->zb_blkid * epb + i);
356 /* recursively visitbp() blocks below this */
357 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
358 err = traverse_dnode(td, bp, &child_dnp[i],
359 zb->zb_objset, zb->zb_blkid * epb + i);
363 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
364 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
365 arc_flags_t flags = ARC_FLAG_WAIT;
368 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
369 zio_flags |= ZIO_FLAG_RAW;
371 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
372 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
377 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset,
378 DMU_META_DNODE_OBJECT);
380 * See the block comment above for the goal of this variable.
381 * If the maxblkid of the meta-dnode is 0, then we know that
382 * we've never had more than DNODES_PER_BLOCK objects in the
383 * dataset, which means we can't have reused any object ids.
385 if (osp->os_meta_dnode.dn_maxblkid == 0)
386 td->td_realloc_possible = B_FALSE;
388 if (OBJSET_BUF_HAS_USERUSED(buf)) {
389 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
390 prefetch_dnode_metadata(td,
391 &osp->os_projectused_dnode,
392 zb->zb_objset, DMU_PROJECTUSED_OBJECT);
393 prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
394 zb->zb_objset, DMU_GROUPUSED_OBJECT);
395 prefetch_dnode_metadata(td, &osp->os_userused_dnode,
396 zb->zb_objset, DMU_USERUSED_OBJECT);
399 err = traverse_dnode(td, bp, &osp->os_meta_dnode, zb->zb_objset,
400 DMU_META_DNODE_OBJECT);
401 if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) {
402 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
403 err = traverse_dnode(td, bp,
404 &osp->os_projectused_dnode, zb->zb_objset,
405 DMU_PROJECTUSED_OBJECT);
407 err = traverse_dnode(td, bp,
408 &osp->os_groupused_dnode, zb->zb_objset,
409 DMU_GROUPUSED_OBJECT);
411 err = traverse_dnode(td, bp,
412 &osp->os_userused_dnode, zb->zb_objset,
413 DMU_USERUSED_OBJECT);
418 arc_buf_destroy(buf, &buf);
421 if (err == 0 && (td->td_flags & TRAVERSE_POST))
422 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
424 if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) {
426 * Ignore this disk error as requested by the HARD flag,
427 * and continue traversal.
433 * If we are stopping here, set td_resume.
435 if (td->td_resume != NULL && err != 0 && !td->td_paused) {
436 td->td_resume->zb_objset = zb->zb_objset;
437 td->td_resume->zb_object = zb->zb_object;
438 td->td_resume->zb_level = 0;
440 * If we have stopped on an indirect block (e.g. due to
441 * i/o error), we have not visited anything below it.
442 * Set the bookmark to the first level-0 block that we need
443 * to visit. This way, the resuming code does not need to
444 * deal with resuming from indirect blocks.
446 * Note, if zb_level <= 0, dnp may be NULL, so we don't want
449 td->td_resume->zb_blkid = zb->zb_blkid;
450 if (zb->zb_level > 0) {
451 td->td_resume->zb_blkid <<= zb->zb_level *
452 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT);
454 td->td_paused = B_TRUE;
461 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
462 uint64_t objset, uint64_t object)
465 zbookmark_phys_t czb;
467 for (j = 0; j < dnp->dn_nblkptr; j++) {
468 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
469 traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb);
472 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
473 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
474 traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb);
479 traverse_dnode(traverse_data_t *td, const blkptr_t *bp, const dnode_phys_t *dnp,
480 uint64_t objset, uint64_t object)
483 zbookmark_phys_t czb;
485 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL &&
486 object < td->td_resume->zb_object)
489 if (td->td_flags & TRAVERSE_PRE) {
490 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
492 err = td->td_func(td->td_spa, NULL, bp, &czb, dnp,
494 if (err == TRAVERSE_VISIT_NO_CHILDREN)
500 for (j = 0; j < dnp->dn_nblkptr; j++) {
501 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
502 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
507 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
508 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
509 err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
512 if (err == 0 && (td->td_flags & TRAVERSE_POST)) {
513 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
515 err = td->td_func(td->td_spa, NULL, bp, &czb, dnp,
517 if (err == TRAVERSE_VISIT_NO_CHILDREN)
527 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
528 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
530 prefetch_data_t *pfd = arg;
531 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
532 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
533 ARC_FLAG_PRESCIENT_PREFETCH;
535 ASSERT(pfd->pd_bytes_fetched >= 0);
536 if (zb->zb_level == ZB_DNODE_LEVEL)
539 return (SET_ERROR(EINTR));
541 if (!prefetch_needed(pfd, bp))
544 mutex_enter(&pfd->pd_mtx);
545 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max)
546 cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx);
547 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp);
548 cv_broadcast(&pfd->pd_cv);
549 mutex_exit(&pfd->pd_mtx);
551 if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
552 zio_flags |= ZIO_FLAG_RAW;
554 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
555 zio_flags, &aflags, zb);
561 traverse_prefetch_thread(void *arg)
563 traverse_data_t *td_main = arg;
564 traverse_data_t td = *td_main;
565 zbookmark_phys_t czb;
566 fstrans_cookie_t cookie = spl_fstrans_mark();
568 td.td_func = traverse_prefetcher;
569 td.td_arg = td_main->td_pfd;
571 td.td_resume = &td_main->td_pfd->pd_resume;
573 SET_BOOKMARK(&czb, td.td_objset,
574 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
575 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb);
577 mutex_enter(&td_main->td_pfd->pd_mtx);
578 td_main->td_pfd->pd_exited = B_TRUE;
579 cv_broadcast(&td_main->td_pfd->pd_cv);
580 mutex_exit(&td_main->td_pfd->pd_mtx);
581 spl_fstrans_unmark(cookie);
585 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
586 * in syncing context).
589 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
590 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
591 blkptr_cb_t func, void *arg)
595 zbookmark_phys_t *czb;
598 ASSERT(ds == NULL || objset == ds->ds_object);
599 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
601 td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP);
602 pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP);
603 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
606 td->td_objset = objset;
607 td->td_rootbp = rootbp;
608 td->td_min_txg = txg_start;
609 td->td_resume = resume;
613 td->td_flags = flags;
614 td->td_paused = B_FALSE;
615 td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE);
617 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
618 VERIFY(spa_feature_enabled_txg(spa,
619 SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg));
621 td->td_hole_birth_enabled_txg = UINT64_MAX;
624 pd->pd_flags = flags;
626 pd->pd_resume = *resume;
627 mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL);
628 cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL);
630 SET_BOOKMARK(czb, td->td_objset,
631 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
633 /* See comment on ZIL traversal in dsl_scan_visitds. */
634 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
635 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL;
636 uint32_t flags = ARC_FLAG_WAIT;
639 ASSERT(!BP_IS_REDACTED(rootbp));
641 if ((td->td_flags & TRAVERSE_NO_DECRYPT) &&
642 BP_IS_PROTECTED(rootbp))
643 zio_flags |= ZIO_FLAG_RAW;
645 err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func,
646 &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb);
649 * If both TRAVERSE_HARD and TRAVERSE_PRE are set,
650 * continue to visitbp so that td_func can be called
651 * in pre stage, and err will reset to zero.
653 if (!(td->td_flags & TRAVERSE_HARD) ||
654 !(td->td_flags & TRAVERSE_PRE))
658 traverse_zil(td, &osp->os_zil_header);
659 arc_buf_destroy(buf, &buf);
663 if (!(flags & TRAVERSE_PREFETCH_DATA) ||
664 taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread,
665 td, TQ_NOQUEUE) == TASKQID_INVALID)
666 pd->pd_exited = B_TRUE;
668 err = traverse_visitbp(td, NULL, rootbp, czb);
670 mutex_enter(&pd->pd_mtx);
671 pd->pd_cancel = B_TRUE;
672 cv_broadcast(&pd->pd_cv);
673 while (!pd->pd_exited)
674 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
675 mutex_exit(&pd->pd_mtx);
677 mutex_destroy(&pd->pd_mtx);
678 cv_destroy(&pd->pd_cv);
680 kmem_free(czb, sizeof (zbookmark_phys_t));
681 kmem_free(pd, sizeof (struct prefetch_data));
682 kmem_free(td, sizeof (struct traverse_data));
688 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
689 * in syncing context).
692 traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start,
693 zbookmark_phys_t *resume,
694 int flags, blkptr_cb_t func, void *arg)
696 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
697 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg));
701 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start,
702 int flags, blkptr_cb_t func, void *arg)
704 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg));
708 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
709 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
710 blkptr_cb_t func, void *arg)
712 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
713 blkptr, txg_start, resume, flags, func, arg));
717 * NB: pool must not be changing on-disk (eg, from zdb or sync context).
720 traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
721 blkptr_cb_t func, void *arg)
724 dsl_pool_t *dp = spa_get_dsl(spa);
725 objset_t *mos = dp->dp_meta_objset;
726 boolean_t hard = (flags & TRAVERSE_HARD);
729 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
730 txg_start, NULL, flags, func, arg);
734 /* visit each dataset */
735 for (uint64_t obj = 1; err == 0;
736 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) {
737 dmu_object_info_t doi;
739 err = dmu_object_info(mos, obj, &doi);
746 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
748 uint64_t txg = txg_start;
750 dsl_pool_config_enter(dp, FTAG);
751 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
752 dsl_pool_config_exit(dp, FTAG);
758 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
759 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
760 err = traverse_dataset(ds, txg, flags, func, arg);
761 dsl_dataset_rele(ds, FTAG);
772 EXPORT_SYMBOL(traverse_dataset);
773 EXPORT_SYMBOL(traverse_pool);
775 module_param(zfs_pd_bytes_max, int, 0644);
776 MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
778 module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
779 MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time");
781 module_param_named(send_holes_without_birth_time,
782 send_holes_without_birth_time, int, 0644);
783 MODULE_PARM_DESC(send_holes_without_birth_time,
784 "Ignore hole_birth txg for zfs send");