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 https://opensource.org/licenses/CDDL-1.0.
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 static int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
43 static int32_t send_holes_without_birth_time = 1;
44 static uint_t zfs_traverse_indirect_prefetch_limit = 32;
46 typedef struct prefetch_data {
49 int32_t pd_bytes_fetched;
53 zbookmark_phys_t pd_resume;
56 typedef struct traverse_data {
61 zbookmark_phys_t *td_resume;
63 prefetch_data_t *td_pfd;
65 uint64_t td_hole_birth_enabled_txg;
68 boolean_t td_realloc_possible;
71 static int traverse_dnode(traverse_data_t *td, const blkptr_t *bp,
72 const dnode_phys_t *dnp, uint64_t objset, uint64_t object);
73 static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *,
74 uint64_t objset, uint64_t object);
77 traverse_zil_block(zilog_t *zilog, const blkptr_t *bp, void *arg,
80 traverse_data_t *td = arg;
86 if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa))
89 SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL,
90 bp->blk_cksum.zc_word[ZIL_ZC_SEQ]);
92 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg);
98 traverse_zil_record(zilog_t *zilog, const lr_t *lrc, void *arg,
101 traverse_data_t *td = arg;
103 if (lrc->lrc_txtype == TX_WRITE) {
104 lr_write_t *lr = (lr_write_t *)lrc;
105 blkptr_t *bp = &lr->lr_blkptr;
111 if (claim_txg == 0 || bp->blk_birth < claim_txg)
114 ASSERT3U(BP_GET_LSIZE(bp), !=, 0);
115 SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid,
116 ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp));
118 (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL,
125 traverse_zil(traverse_data_t *td, zil_header_t *zh)
127 uint64_t claim_txg = zh->zh_claim_txg;
130 * We only want to visit blocks that have been claimed but not yet
131 * replayed; plus blocks that are already stable in read-only mode.
133 if (claim_txg == 0 && spa_writeable(td->td_spa))
136 zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh);
137 (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td,
138 claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT));
142 typedef enum resume_skip {
149 * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and
150 * the block indicated by zb does not need to be visited at all. Returns
151 * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the
152 * resume point. This indicates that this block should be visited but not its
153 * children (since they must have been visited in a previous traversal).
154 * Otherwise returns RESUME_SKIP_NONE.
157 resume_skip_check(const traverse_data_t *td, const dnode_phys_t *dnp,
158 const zbookmark_phys_t *zb)
160 if (td->td_resume != NULL) {
162 * If we already visited this bp & everything below,
163 * don't bother doing it again.
165 if (zbookmark_subtree_completed(dnp, zb, td->td_resume))
166 return (RESUME_SKIP_ALL);
168 if (memcmp(zb, td->td_resume, sizeof (*zb)) == 0) {
169 if (td->td_flags & TRAVERSE_POST)
170 return (RESUME_SKIP_CHILDREN);
173 return (RESUME_SKIP_NONE);
177 * Returns B_TRUE, if prefetch read is issued, otherwise B_FALSE.
180 traverse_prefetch_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
181 const blkptr_t *bp, const zbookmark_phys_t *zb)
183 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
184 ARC_FLAG_PRESCIENT_PREFETCH;
185 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
187 if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA))
190 * If this bp is before the resume point, it may have already been
193 if (resume_skip_check(td, dnp, zb) != RESUME_SKIP_NONE)
195 if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg)
197 if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)
199 ASSERT(!BP_IS_REDACTED(bp));
201 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
202 zio_flags |= ZIO_FLAG_RAW;
204 (void) arc_read(NULL, td->td_spa, bp, NULL, NULL,
205 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
210 prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp)
212 ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA);
213 if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) ||
214 BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG || BP_IS_REDACTED(bp))
220 traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
221 const blkptr_t *bp, const zbookmark_phys_t *zb)
224 arc_buf_t *buf = NULL;
225 prefetch_data_t *pd = td->td_pfd;
227 switch (resume_skip_check(td, dnp, zb)) {
228 case RESUME_SKIP_ALL:
230 case RESUME_SKIP_CHILDREN:
232 case RESUME_SKIP_NONE:
238 if (bp->blk_birth == 0) {
240 * Since this block has a birth time of 0 it must be one of
241 * two things: a hole created before the
242 * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole
243 * which has always been a hole in an object.
245 * If a file is written sparsely, then the unwritten parts of
246 * the file were "always holes" -- that is, they have been
247 * holes since this object was allocated. However, we (and
248 * our callers) can not necessarily tell when an object was
249 * allocated. Therefore, if it's possible that this object
250 * was freed and then its object number reused, we need to
251 * visit all the holes with birth==0.
253 * If it isn't possible that the object number was reused,
254 * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote
255 * all the blocks we will visit as part of this traversal,
256 * then this hole must have always existed, so we can skip
257 * it. We visit blocks born after (exclusive) td_min_txg.
259 * Note that the meta-dnode cannot be reallocated.
261 if (!send_holes_without_birth_time &&
262 (!td->td_realloc_possible ||
263 zb->zb_object == DMU_META_DNODE_OBJECT) &&
264 td->td_hole_birth_enabled_txg <= td->td_min_txg)
266 } else if (bp->blk_birth <= td->td_min_txg) {
270 if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) {
271 uint64_t size = BP_GET_LSIZE(bp);
272 mutex_enter(&pd->pd_mtx);
273 ASSERT(pd->pd_bytes_fetched >= 0);
274 while (pd->pd_bytes_fetched < size && !pd->pd_exited)
275 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
276 pd->pd_bytes_fetched -= size;
277 cv_broadcast(&pd->pd_cv);
278 mutex_exit(&pd->pd_mtx);
281 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) {
282 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
288 if (td->td_flags & TRAVERSE_PRE) {
289 err = td->td_func(td->td_spa, NULL, bp, zb, dnp,
291 if (err == TRAVERSE_VISIT_NO_CHILDREN)
297 if (BP_GET_LEVEL(bp) > 0) {
298 uint32_t flags = ARC_FLAG_WAIT;
299 int32_t i, ptidx, pidx;
300 uint32_t prefetchlimit;
301 int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
302 zbookmark_phys_t *czb;
304 ASSERT(!BP_IS_PROTECTED(bp));
306 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
307 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
311 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
314 * When performing a traversal it is beneficial to
315 * asynchronously read-ahead the upcoming indirect
316 * blocks since they will be needed shortly. However,
317 * since a 128k indirect (non-L0) block may contain up
318 * to 1024 128-byte block pointers, its preferable to not
319 * prefetch them all at once. Issuing a large number of
320 * async reads may effect performance, and the earlier
321 * the indirect blocks are prefetched the less likely
322 * they are to still be resident in the ARC when needed.
323 * Therefore, prefetching indirect blocks is limited to
324 * zfs_traverse_indirect_prefetch_limit=32 blocks by
327 * pidx: Index for which next prefetch to be issued.
328 * ptidx: Index at which next prefetch to be triggered.
332 prefetchlimit = zfs_traverse_indirect_prefetch_limit;
333 for (i = 0; i < epb; i++) {
334 if (prefetchlimit && i == ptidx) {
335 ASSERT3S(ptidx, <=, pidx);
336 for (uint32_t prefetched = 0; pidx < epb &&
337 prefetched < prefetchlimit; pidx++) {
338 SET_BOOKMARK(czb, zb->zb_objset,
339 zb->zb_object, zb->zb_level - 1,
340 zb->zb_blkid * epb + pidx);
341 if (traverse_prefetch_metadata(td, dnp,
342 &((blkptr_t *)buf->b_data)[pidx],
346 MAX(prefetchlimit / 2, 1))
352 /* recursively visitbp() blocks below this */
353 SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object,
355 zb->zb_blkid * epb + i);
356 err = traverse_visitbp(td, dnp,
357 &((blkptr_t *)buf->b_data)[i], czb);
362 kmem_free(czb, sizeof (zbookmark_phys_t));
364 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
365 uint32_t flags = ARC_FLAG_WAIT;
366 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
368 int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
369 dnode_phys_t *child_dnp;
372 * dnode blocks might have their bonus buffers encrypted, so
373 * we must be careful to honor TRAVERSE_NO_DECRYPT
375 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
376 zio_flags |= ZIO_FLAG_RAW;
378 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
379 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
383 child_dnp = buf->b_data;
385 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
386 prefetch_dnode_metadata(td, &child_dnp[i],
387 zb->zb_objset, zb->zb_blkid * epb + i);
390 /* recursively visitbp() blocks below this */
391 for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) {
392 err = traverse_dnode(td, bp, &child_dnp[i],
393 zb->zb_objset, zb->zb_blkid * epb + i);
397 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
398 uint32_t zio_flags = ZIO_FLAG_CANFAIL;
399 arc_flags_t flags = ARC_FLAG_WAIT;
402 if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
403 zio_flags |= ZIO_FLAG_RAW;
405 err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf,
406 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
411 prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset,
412 DMU_META_DNODE_OBJECT);
414 * See the block comment above for the goal of this variable.
415 * If the maxblkid of the meta-dnode is 0, then we know that
416 * we've never had more than DNODES_PER_BLOCK objects in the
417 * dataset, which means we can't have reused any object ids.
419 if (osp->os_meta_dnode.dn_maxblkid == 0)
420 td->td_realloc_possible = B_FALSE;
422 if (OBJSET_BUF_HAS_USERUSED(buf)) {
423 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
424 prefetch_dnode_metadata(td,
425 &osp->os_projectused_dnode,
426 zb->zb_objset, DMU_PROJECTUSED_OBJECT);
427 prefetch_dnode_metadata(td, &osp->os_groupused_dnode,
428 zb->zb_objset, DMU_GROUPUSED_OBJECT);
429 prefetch_dnode_metadata(td, &osp->os_userused_dnode,
430 zb->zb_objset, DMU_USERUSED_OBJECT);
433 err = traverse_dnode(td, bp, &osp->os_meta_dnode, zb->zb_objset,
434 DMU_META_DNODE_OBJECT);
435 if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) {
436 if (OBJSET_BUF_HAS_PROJECTUSED(buf))
437 err = traverse_dnode(td, bp,
438 &osp->os_projectused_dnode, zb->zb_objset,
439 DMU_PROJECTUSED_OBJECT);
441 err = traverse_dnode(td, bp,
442 &osp->os_groupused_dnode, zb->zb_objset,
443 DMU_GROUPUSED_OBJECT);
445 err = traverse_dnode(td, bp,
446 &osp->os_userused_dnode, zb->zb_objset,
447 DMU_USERUSED_OBJECT);
452 arc_buf_destroy(buf, &buf);
455 if (err == 0 && (td->td_flags & TRAVERSE_POST))
456 err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg);
458 if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) {
460 * Ignore this disk error as requested by the HARD flag,
461 * and continue traversal.
467 * If we are stopping here, set td_resume.
469 if (td->td_resume != NULL && err != 0 && !td->td_paused) {
470 td->td_resume->zb_objset = zb->zb_objset;
471 td->td_resume->zb_object = zb->zb_object;
472 td->td_resume->zb_level = 0;
474 * If we have stopped on an indirect block (e.g. due to
475 * i/o error), we have not visited anything below it.
476 * Set the bookmark to the first level-0 block that we need
477 * to visit. This way, the resuming code does not need to
478 * deal with resuming from indirect blocks.
480 * Note, if zb_level <= 0, dnp may be NULL, so we don't want
483 td->td_resume->zb_blkid = zb->zb_blkid;
484 if (zb->zb_level > 0) {
485 td->td_resume->zb_blkid <<= zb->zb_level *
486 (dnp->dn_indblkshift - SPA_BLKPTRSHIFT);
488 td->td_paused = B_TRUE;
495 prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp,
496 uint64_t objset, uint64_t object)
499 zbookmark_phys_t czb;
501 for (j = 0; j < dnp->dn_nblkptr; j++) {
502 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
503 traverse_prefetch_metadata(td, dnp, &dnp->dn_blkptr[j], &czb);
506 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
507 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
508 traverse_prefetch_metadata(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
513 traverse_dnode(traverse_data_t *td, const blkptr_t *bp, const dnode_phys_t *dnp,
514 uint64_t objset, uint64_t object)
517 zbookmark_phys_t czb;
519 if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL &&
520 object < td->td_resume->zb_object)
523 if (td->td_flags & TRAVERSE_PRE) {
524 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
526 err = td->td_func(td->td_spa, NULL, bp, &czb, dnp,
528 if (err == TRAVERSE_VISIT_NO_CHILDREN)
534 for (j = 0; j < dnp->dn_nblkptr; j++) {
535 SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j);
536 err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb);
541 if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
542 SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID);
543 err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb);
546 if (err == 0 && (td->td_flags & TRAVERSE_POST)) {
547 SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL,
549 err = td->td_func(td->td_spa, NULL, bp, &czb, dnp,
551 if (err == TRAVERSE_VISIT_NO_CHILDREN)
560 traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
561 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
563 (void) zilog, (void) dnp;
564 prefetch_data_t *pfd = arg;
565 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
566 arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
567 ARC_FLAG_PRESCIENT_PREFETCH;
569 ASSERT(pfd->pd_bytes_fetched >= 0);
570 if (zb->zb_level == ZB_DNODE_LEVEL)
573 return (SET_ERROR(EINTR));
575 if (!prefetch_needed(pfd, bp))
578 mutex_enter(&pfd->pd_mtx);
579 while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max)
580 cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx);
581 pfd->pd_bytes_fetched += BP_GET_LSIZE(bp);
582 cv_broadcast(&pfd->pd_cv);
583 mutex_exit(&pfd->pd_mtx);
585 if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp))
586 zio_flags |= ZIO_FLAG_RAW;
588 (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
589 zio_flags, &aflags, zb);
595 traverse_prefetch_thread(void *arg)
597 traverse_data_t *td_main = arg;
598 traverse_data_t td = *td_main;
599 zbookmark_phys_t czb;
600 fstrans_cookie_t cookie = spl_fstrans_mark();
602 td.td_func = traverse_prefetcher;
603 td.td_arg = td_main->td_pfd;
605 td.td_resume = &td_main->td_pfd->pd_resume;
607 SET_BOOKMARK(&czb, td.td_objset,
608 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
609 (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb);
611 mutex_enter(&td_main->td_pfd->pd_mtx);
612 td_main->td_pfd->pd_exited = B_TRUE;
613 cv_broadcast(&td_main->td_pfd->pd_cv);
614 mutex_exit(&td_main->td_pfd->pd_mtx);
615 spl_fstrans_unmark(cookie);
619 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
620 * in syncing context).
623 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
624 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
625 blkptr_cb_t func, void *arg)
629 zbookmark_phys_t *czb;
632 ASSERT(ds == NULL || objset == ds->ds_object);
633 ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));
635 td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP);
636 pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP);
637 czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP);
640 td->td_objset = objset;
641 td->td_rootbp = rootbp;
642 td->td_min_txg = txg_start;
643 td->td_resume = resume;
647 td->td_flags = flags;
648 td->td_paused = B_FALSE;
649 td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE);
651 if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) {
652 VERIFY(spa_feature_enabled_txg(spa,
653 SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg));
655 td->td_hole_birth_enabled_txg = UINT64_MAX;
658 pd->pd_flags = flags;
660 pd->pd_resume = *resume;
661 mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL);
662 cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL);
664 SET_BOOKMARK(czb, td->td_objset,
665 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
667 /* See comment on ZIL traversal in dsl_scan_visitds. */
668 if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) {
669 zio_flag_t zio_flags = ZIO_FLAG_CANFAIL;
670 uint32_t flags = ARC_FLAG_WAIT;
673 ASSERT(!BP_IS_REDACTED(rootbp));
675 if ((td->td_flags & TRAVERSE_NO_DECRYPT) &&
676 BP_IS_PROTECTED(rootbp))
677 zio_flags |= ZIO_FLAG_RAW;
679 err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func,
680 &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb);
683 * If both TRAVERSE_HARD and TRAVERSE_PRE are set,
684 * continue to visitbp so that td_func can be called
685 * in pre stage, and err will reset to zero.
687 if (!(td->td_flags & TRAVERSE_HARD) ||
688 !(td->td_flags & TRAVERSE_PRE))
692 traverse_zil(td, &osp->os_zil_header);
693 arc_buf_destroy(buf, &buf);
697 if (!(flags & TRAVERSE_PREFETCH_DATA) ||
698 taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread,
699 td, TQ_NOQUEUE) == TASKQID_INVALID)
700 pd->pd_exited = B_TRUE;
702 err = traverse_visitbp(td, NULL, rootbp, czb);
704 mutex_enter(&pd->pd_mtx);
705 pd->pd_cancel = B_TRUE;
706 cv_broadcast(&pd->pd_cv);
707 while (!pd->pd_exited)
708 cv_wait_sig(&pd->pd_cv, &pd->pd_mtx);
709 mutex_exit(&pd->pd_mtx);
711 mutex_destroy(&pd->pd_mtx);
712 cv_destroy(&pd->pd_cv);
714 kmem_free(czb, sizeof (zbookmark_phys_t));
715 kmem_free(pd, sizeof (struct prefetch_data));
716 kmem_free(td, sizeof (struct traverse_data));
722 * NB: dataset must not be changing on-disk (eg, is a snapshot or we are
723 * in syncing context).
726 traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start,
727 zbookmark_phys_t *resume,
728 int flags, blkptr_cb_t func, void *arg)
730 return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object,
731 &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg));
735 traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start,
736 int flags, blkptr_cb_t func, void *arg)
738 return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg));
742 traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
743 uint64_t txg_start, zbookmark_phys_t *resume, int flags,
744 blkptr_cb_t func, void *arg)
746 return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET,
747 blkptr, txg_start, resume, flags, func, arg));
751 * NB: pool must not be changing on-disk (eg, from zdb or sync context).
754 traverse_pool(spa_t *spa, uint64_t txg_start, int flags,
755 blkptr_cb_t func, void *arg)
758 dsl_pool_t *dp = spa_get_dsl(spa);
759 objset_t *mos = dp->dp_meta_objset;
760 boolean_t hard = (flags & TRAVERSE_HARD);
763 err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
764 txg_start, NULL, flags, func, arg);
768 /* visit each dataset */
769 for (uint64_t obj = 1; err == 0;
770 err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) {
771 dmu_object_info_t doi;
773 err = dmu_object_info(mos, obj, &doi);
780 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
782 uint64_t txg = txg_start;
784 dsl_pool_config_enter(dp, FTAG);
785 err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
786 dsl_pool_config_exit(dp, FTAG);
792 if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg)
793 txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
794 err = traverse_dataset(ds, txg, flags, func, arg);
795 dsl_dataset_rele(ds, FTAG);
805 EXPORT_SYMBOL(traverse_dataset);
806 EXPORT_SYMBOL(traverse_pool);
808 ZFS_MODULE_PARAM(zfs, zfs_, pd_bytes_max, INT, ZMOD_RW,
809 "Max number of bytes to prefetch");
811 ZFS_MODULE_PARAM(zfs, zfs_, traverse_indirect_prefetch_limit, UINT, ZMOD_RW,
812 "Traverse prefetch number of blocks pointed by indirect block");
815 module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
816 MODULE_PARM_DESC(ignore_hole_birth,
817 "Alias for send_holes_without_birth_time");
821 ZFS_MODULE_PARAM(zfs, , send_holes_without_birth_time, INT, ZMOD_RW,
822 "Ignore hole_birth txg for zfs send");