X-Git-Url: https://granicus.if.org/sourcecode?a=blobdiff_plain;f=module%2Fzfs%2Fdmu_traverse.c;h=f0b5356180a871b7fbfb3f2e54ed133551899351;hb=d2734cce68cf740e015312314415f9034c67851c;hp=023f90e12e342999aa8c3a767b076de8f755f047;hpb=572e285762521df27fe5b026f409ba1a21abb7ac;p=zfs diff --git a/module/zfs/dmu_traverse.c b/module/zfs/dmu_traverse.c index 023f90e12..f0b535618 100644 --- a/module/zfs/dmu_traverse.c +++ b/module/zfs/dmu_traverse.c @@ -20,6 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2012, 2018 by Delphix. All rights reserved. */ #include @@ -30,22 +31,25 @@ #include #include #include +#include #include #include #include #include #include +#include -int zfs_pd_blks_max = 100; +int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ +int32_t send_holes_without_birth_time = 1; typedef struct prefetch_data { kmutex_t pd_mtx; kcondvar_t pd_cv; - int pd_blks_max; - int pd_blks_fetched; + int32_t pd_bytes_fetched; int pd_flags; boolean_t pd_cancel; boolean_t pd_exited; + zbookmark_phys_t pd_resume; } prefetch_data_t; typedef struct traverse_data { @@ -53,31 +57,37 @@ typedef struct traverse_data { uint64_t td_objset; blkptr_t *td_rootbp; uint64_t td_min_txg; + zbookmark_phys_t *td_resume; int td_flags; prefetch_data_t *td_pfd; + boolean_t td_paused; + uint64_t td_hole_birth_enabled_txg; blkptr_cb_t *td_func; void *td_arg; + boolean_t td_realloc_possible; } traverse_data_t; static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, - arc_buf_t *buf, uint64_t objset, uint64_t object); + uint64_t objset, uint64_t object); +static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, + uint64_t objset, uint64_t object); static int traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) { traverse_data_t *td = arg; - zbookmark_t zb; + zbookmark_phys_t zb; - if (bp->blk_birth == 0) + if (BP_IS_HOLE(bp)) return (0); - if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) - return (0); + if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa)) + return (-1); SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); - (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, td->td_arg); + (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); return (0); } @@ -90,9 +100,9 @@ traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) if (lrc->lrc_txtype == TX_WRITE) { lr_write_t *lr = (lr_write_t *)lrc; blkptr_t *bp = &lr->lr_blkptr; - zbookmark_t zb; + zbookmark_phys_t zb; - if (bp->blk_birth == 0) + if (BP_IS_HOLE(bp)) return (0); if (claim_txg == 0 || bp->blk_birth < claim_txg) @@ -101,7 +111,7 @@ traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); - (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, + (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); } return (0); @@ -111,218 +121,437 @@ static void traverse_zil(traverse_data_t *td, zil_header_t *zh) { uint64_t claim_txg = zh->zh_claim_txg; - zilog_t *zilog; /* * We only want to visit blocks that have been claimed but not yet - * replayed; plus, in read-only mode, blocks that are already stable. + * replayed; plus blocks that are already stable in read-only mode. */ if (claim_txg == 0 && spa_writeable(td->td_spa)) return; - zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); - + zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, - claim_txg); - + claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT)); zil_free(zilog); } +typedef enum resume_skip { + RESUME_SKIP_ALL, + RESUME_SKIP_NONE, + RESUME_SKIP_CHILDREN +} resume_skip_t; + +/* + * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and + * the block indicated by zb does not need to be visited at all. Returns + * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the + * resume point. This indicates that this block should be visited but not its + * children (since they must have been visited in a previous traversal). + * Otherwise returns RESUME_SKIP_NONE. + */ +static resume_skip_t +resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, + const zbookmark_phys_t *zb) +{ + if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { + /* + * If we already visited this bp & everything below, + * don't bother doing it again. + */ + if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) + return (RESUME_SKIP_ALL); + + /* + * If we found the block we're trying to resume from, zero + * the bookmark out to indicate that we have resumed. + */ + if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { + bzero(td->td_resume, sizeof (*zb)); + if (td->td_flags & TRAVERSE_POST) + return (RESUME_SKIP_CHILDREN); + } + } + return (RESUME_SKIP_NONE); +} + +static void +traverse_prefetch_metadata(traverse_data_t *td, + const blkptr_t *bp, const zbookmark_phys_t *zb) +{ + arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; + int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; + + if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) + return; + /* + * If we are in the process of resuming, don't prefetch, because + * some children will not be needed (and in fact may have already + * been freed). + */ + if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) + return; + if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) + return; + if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) + return; + + if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) + zio_flags |= ZIO_FLAG_RAW; + + (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, + ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); +} + +static boolean_t +prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) +{ + ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); + if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || + BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) + return (B_FALSE); + return (B_TRUE); +} + static int traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, - arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb) + const blkptr_t *bp, const zbookmark_phys_t *zb) { - zbookmark_t czb; - int err = 0, lasterr = 0; + int err = 0; arc_buf_t *buf = NULL; prefetch_data_t *pd = td->td_pfd; - boolean_t hard = td->td_flags & TRAVERSE_HARD; - if (bp->blk_birth == 0) { - err = td->td_func(td->td_spa, NULL, NULL, pbuf, zb, dnp, - td->td_arg); - return (err); + switch (resume_skip_check(td, dnp, zb)) { + case RESUME_SKIP_ALL: + return (0); + case RESUME_SKIP_CHILDREN: + goto post; + case RESUME_SKIP_NONE: + break; + default: + ASSERT(0); } - if (bp->blk_birth <= td->td_min_txg) + if (bp->blk_birth == 0) { + /* + * Since this block has a birth time of 0 it must be one of + * two things: a hole created before the + * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole + * which has always been a hole in an object. + * + * If a file is written sparsely, then the unwritten parts of + * the file were "always holes" -- that is, they have been + * holes since this object was allocated. However, we (and + * our callers) can not necessarily tell when an object was + * allocated. Therefore, if it's possible that this object + * was freed and then its object number reused, we need to + * visit all the holes with birth==0. + * + * If it isn't possible that the object number was reused, + * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote + * all the blocks we will visit as part of this traversal, + * then this hole must have always existed, so we can skip + * it. We visit blocks born after (exclusive) td_min_txg. + * + * Note that the meta-dnode cannot be reallocated. + */ + if (!send_holes_without_birth_time && + (!td->td_realloc_possible || + zb->zb_object == DMU_META_DNODE_OBJECT) && + td->td_hole_birth_enabled_txg <= td->td_min_txg) + return (0); + } else if (bp->blk_birth <= td->td_min_txg) { return (0); + } - if (pd && !pd->pd_exited && - ((pd->pd_flags & TRAVERSE_PREFETCH_DATA) || - BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) { + if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { + uint64_t size = BP_GET_LSIZE(bp); mutex_enter(&pd->pd_mtx); - ASSERT(pd->pd_blks_fetched >= 0); - while (pd->pd_blks_fetched == 0 && !pd->pd_exited) - cv_wait(&pd->pd_cv, &pd->pd_mtx); - pd->pd_blks_fetched--; + ASSERT(pd->pd_bytes_fetched >= 0); + while (pd->pd_bytes_fetched < size && !pd->pd_exited) + cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); + pd->pd_bytes_fetched -= size; cv_broadcast(&pd->pd_cv); mutex_exit(&pd->pd_mtx); } + if (BP_IS_HOLE(bp)) { + err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); + if (err != 0) + goto post; + return (0); + } + if (td->td_flags & TRAVERSE_PRE) { - err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, + err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); if (err == TRAVERSE_VISIT_NO_CHILDREN) return (0); - if (err) - return (err); + if (err != 0) + goto post; } if (BP_GET_LEVEL(bp) > 0) { - uint32_t flags = ARC_WAIT; - int i; - blkptr_t *cbp; - int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; + uint32_t flags = ARC_FLAG_WAIT; + int32_t i; + int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; + zbookmark_phys_t *czb; - err = dsl_read(NULL, td->td_spa, bp, pbuf, - arc_getbuf_func, &buf, + ASSERT(!BP_IS_PROTECTED(bp)); + + err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) - return (err); + if (err != 0) + goto post; + + czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); + + for (i = 0; i < epb; i++) { + SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, + zb->zb_level - 1, + zb->zb_blkid * epb + i); + traverse_prefetch_metadata(td, + &((blkptr_t *)buf->b_data)[i], czb); + } /* recursively visitbp() blocks below this */ - cbp = buf->b_data; - for (i = 0; i < epb; i++, cbp++) { - SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, + for (i = 0; i < epb; i++) { + SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, zb->zb_level - 1, zb->zb_blkid * epb + i); - err = traverse_visitbp(td, dnp, buf, cbp, &czb); - if (err) { - if (!hard) - break; - lasterr = err; - } + err = traverse_visitbp(td, dnp, + &((blkptr_t *)buf->b_data)[i], czb); + if (err != 0) + break; } - } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { - uint32_t flags = ARC_WAIT; - int i; - int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; - err = dsl_read(NULL, td->td_spa, bp, pbuf, - arc_getbuf_func, &buf, - ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) - return (err); + kmem_free(czb, sizeof (zbookmark_phys_t)); + + } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { + uint32_t flags = ARC_FLAG_WAIT; + uint32_t zio_flags = ZIO_FLAG_CANFAIL; + int32_t i; + int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; + dnode_phys_t *child_dnp; + + /* + * dnode blocks might have their bonus buffers encrypted, so + * we must be careful to honor TRAVERSE_NO_DECRYPT + */ + if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) + zio_flags |= ZIO_FLAG_RAW; + + err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, + ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); + if (err != 0) + goto post; + + child_dnp = buf->b_data; + + for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { + prefetch_dnode_metadata(td, &child_dnp[i], + zb->zb_objset, zb->zb_blkid * epb + i); + } /* recursively visitbp() blocks below this */ - dnp = buf->b_data; - for (i = 0; i < epb; i++, dnp++) { - err = traverse_dnode(td, dnp, buf, zb->zb_objset, - zb->zb_blkid * epb + i); - if (err) { - if (!hard) - break; - lasterr = err; - } + for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { + err = traverse_dnode(td, &child_dnp[i], + zb->zb_objset, zb->zb_blkid * epb + i); + if (err != 0) + break; } } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { - uint32_t flags = ARC_WAIT; + uint32_t zio_flags = ZIO_FLAG_CANFAIL; + arc_flags_t flags = ARC_FLAG_WAIT; objset_phys_t *osp; - dnode_phys_t *dnp; - err = dsl_read_nolock(NULL, td->td_spa, bp, - arc_getbuf_func, &buf, - ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) - return (err); + if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) + zio_flags |= ZIO_FLAG_RAW; + + err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, + ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); + if (err != 0) + goto post; osp = buf->b_data; - dnp = &osp->os_meta_dnode; - err = traverse_dnode(td, dnp, buf, zb->zb_objset, + prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, DMU_META_DNODE_OBJECT); - if (err && hard) { - lasterr = err; - err = 0; - } - if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { - dnp = &osp->os_userused_dnode; - err = traverse_dnode(td, dnp, buf, zb->zb_objset, - DMU_USERUSED_OBJECT); + /* + * See the block comment above for the goal of this variable. + * If the maxblkid of the meta-dnode is 0, then we know that + * we've never had more than DNODES_PER_BLOCK objects in the + * dataset, which means we can't have reused any object ids. + */ + if (osp->os_meta_dnode.dn_maxblkid == 0) + td->td_realloc_possible = B_FALSE; + + if (OBJSET_BUF_HAS_USERUSED(buf)) { + if (OBJSET_BUF_HAS_PROJECTUSED(buf)) + prefetch_dnode_metadata(td, + &osp->os_projectused_dnode, + zb->zb_objset, DMU_PROJECTUSED_OBJECT); + prefetch_dnode_metadata(td, &osp->os_groupused_dnode, + zb->zb_objset, DMU_GROUPUSED_OBJECT); + prefetch_dnode_metadata(td, &osp->os_userused_dnode, + zb->zb_objset, DMU_USERUSED_OBJECT); } - if (err && hard) { - lasterr = err; - err = 0; - } - if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { - dnp = &osp->os_groupused_dnode; - err = traverse_dnode(td, dnp, buf, zb->zb_objset, - DMU_GROUPUSED_OBJECT); + + err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, + DMU_META_DNODE_OBJECT); + if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) { + if (OBJSET_BUF_HAS_PROJECTUSED(buf)) + err = traverse_dnode(td, + &osp->os_projectused_dnode, zb->zb_objset, + DMU_PROJECTUSED_OBJECT); + if (err == 0) + err = traverse_dnode(td, + &osp->os_groupused_dnode, zb->zb_objset, + DMU_GROUPUSED_OBJECT); + if (err == 0) + err = traverse_dnode(td, + &osp->os_userused_dnode, zb->zb_objset, + DMU_USERUSED_OBJECT); } } if (buf) - (void) arc_buf_remove_ref(buf, &buf); + arc_buf_destroy(buf, &buf); - if (err == 0 && lasterr == 0 && (td->td_flags & TRAVERSE_POST)) { - err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, - td->td_arg); +post: + if (err == 0 && (td->td_flags & TRAVERSE_POST)) + err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); + + if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) { + /* + * Ignore this disk error as requested by the HARD flag, + * and continue traversal. + */ + err = 0; } - return (err != 0 ? err : lasterr); + /* + * If we are stopping here, set td_resume. + */ + if (td->td_resume != NULL && err != 0 && !td->td_paused) { + td->td_resume->zb_objset = zb->zb_objset; + td->td_resume->zb_object = zb->zb_object; + td->td_resume->zb_level = 0; + /* + * If we have stopped on an indirect block (e.g. due to + * i/o error), we have not visited anything below it. + * Set the bookmark to the first level-0 block that we need + * to visit. This way, the resuming code does not need to + * deal with resuming from indirect blocks. + * + * Note, if zb_level <= 0, dnp may be NULL, so we don't want + * to dereference it. + */ + td->td_resume->zb_blkid = zb->zb_blkid; + if (zb->zb_level > 0) { + td->td_resume->zb_blkid <<= zb->zb_level * + (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); + } + td->td_paused = B_TRUE; + } + + return (err); +} + +static void +prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, + uint64_t objset, uint64_t object) +{ + int j; + zbookmark_phys_t czb; + + for (j = 0; j < dnp->dn_nblkptr; j++) { + SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); + traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); + } + + if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { + SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); + traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb); + } } static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, - arc_buf_t *buf, uint64_t objset, uint64_t object) + uint64_t objset, uint64_t object) { - int j, err = 0, lasterr = 0; - zbookmark_t czb; - boolean_t hard = (td->td_flags & TRAVERSE_HARD); + int j, err = 0; + zbookmark_phys_t czb; + + if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && + object < td->td_resume->zb_object) + return (0); + + if (td->td_flags & TRAVERSE_PRE) { + SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, + ZB_DNODE_BLKID); + err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, + td->td_arg); + if (err == TRAVERSE_VISIT_NO_CHILDREN) + return (0); + if (err != 0) + return (err); + } for (j = 0; j < dnp->dn_nblkptr; j++) { SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); - err = traverse_visitbp(td, dnp, buf, - (blkptr_t *)&dnp->dn_blkptr[j], &czb); - if (err) { - if (!hard) - break; - lasterr = err; - } + err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); + if (err != 0) + break; } - if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { - SET_BOOKMARK(&czb, objset, - object, 0, DMU_SPILL_BLKID); - err = traverse_visitbp(td, dnp, buf, - (blkptr_t *)&dnp->dn_spill, &czb); - if (err) { - if (!hard) - return (err); - lasterr = err; - } + if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { + SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); + err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb); } - return (err != 0 ? err : lasterr); + + if (err == 0 && (td->td_flags & TRAVERSE_POST)) { + SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, + ZB_DNODE_BLKID); + err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, + td->td_arg); + if (err == TRAVERSE_VISIT_NO_CHILDREN) + return (0); + if (err != 0) + return (err); + } + return (err); } /* ARGSUSED */ static int traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, - arc_buf_t *pbuf, const zbookmark_t *zb, const dnode_phys_t *dnp, - void *arg) + const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) { prefetch_data_t *pfd = arg; - uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; + int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; + arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH | + ARC_FLAG_PRESCIENT_PREFETCH; - ASSERT(pfd->pd_blks_fetched >= 0); + ASSERT(pfd->pd_bytes_fetched >= 0); + if (bp == NULL) + return (0); if (pfd->pd_cancel) - return (EINTR); + return (SET_ERROR(EINTR)); - if (bp == NULL || !((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || - BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0) || - BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) + if (!prefetch_needed(pfd, bp)) return (0); mutex_enter(&pfd->pd_mtx); - while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max) - cv_wait(&pfd->pd_cv, &pfd->pd_mtx); - pfd->pd_blks_fetched++; + while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) + cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx); + pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); cv_broadcast(&pfd->pd_cv); mutex_exit(&pfd->pd_mtx); - (void) dsl_read(NULL, spa, bp, pbuf, NULL, NULL, - ZIO_PRIORITY_ASYNC_READ, - ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, - &aflags, zb); + if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) + zio_flags |= ZIO_FLAG_RAW; + + (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, + zio_flags, &aflags, zb); return (0); } @@ -332,20 +561,23 @@ traverse_prefetch_thread(void *arg) { traverse_data_t *td_main = arg; traverse_data_t td = *td_main; - zbookmark_t czb; + zbookmark_phys_t czb; + fstrans_cookie_t cookie = spl_fstrans_mark(); td.td_func = traverse_prefetcher; td.td_arg = td_main->td_pfd; td.td_pfd = NULL; + td.td_resume = &td_main->td_pfd->pd_resume; SET_BOOKMARK(&czb, td.td_objset, ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); - (void) traverse_visitbp(&td, NULL, NULL, td.td_rootbp, &czb); + (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); mutex_enter(&td_main->td_pfd->pd_mtx); td_main->td_pfd->pd_exited = B_TRUE; cv_broadcast(&td_main->td_pfd->pd_cv); mutex_exit(&td_main->td_pfd->pd_mtx); + spl_fstrans_unmark(cookie); } /* @@ -353,57 +585,99 @@ traverse_prefetch_thread(void *arg) * in syncing context). */ static int -traverse_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *rootbp, - uint64_t txg_start, int flags, blkptr_cb_t func, void *arg) +traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, + uint64_t txg_start, zbookmark_phys_t *resume, int flags, + blkptr_cb_t func, void *arg) { - traverse_data_t td; - prefetch_data_t pd = { 0 }; - zbookmark_t czb; + traverse_data_t *td; + prefetch_data_t *pd; + zbookmark_phys_t *czb; int err; - td.td_spa = spa; - td.td_objset = ds ? ds->ds_object : 0; - td.td_rootbp = rootbp; - td.td_min_txg = txg_start; - td.td_func = func; - td.td_arg = arg; - td.td_pfd = &pd; - td.td_flags = flags; + ASSERT(ds == NULL || objset == ds->ds_object); + ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); + + td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP); + pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP); + czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); + + td->td_spa = spa; + td->td_objset = objset; + td->td_rootbp = rootbp; + td->td_min_txg = txg_start; + td->td_resume = resume; + td->td_func = func; + td->td_arg = arg; + td->td_pfd = pd; + td->td_flags = flags; + td->td_paused = B_FALSE; + td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); + + if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { + VERIFY(spa_feature_enabled_txg(spa, + SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg)); + } else { + td->td_hole_birth_enabled_txg = UINT64_MAX; + } - pd.pd_blks_max = zfs_pd_blks_max; - pd.pd_flags = flags; - mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); - cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); + pd->pd_flags = flags; + if (resume != NULL) + pd->pd_resume = *resume; + mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL); + cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL); - /* See comment on ZIL traversal in dsl_scan_visitds. */ - if (ds != NULL && !dsl_dataset_is_snapshot(ds)) { - objset_t *os; - - err = dmu_objset_from_ds(ds, &os); - if (err) - return (err); + SET_BOOKMARK(czb, td->td_objset, + ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); - traverse_zil(&td, &os->os_zil_header); + /* See comment on ZIL traversal in dsl_scan_visitds. */ + if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { + enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; + uint32_t flags = ARC_FLAG_WAIT; + objset_phys_t *osp; + arc_buf_t *buf; + + if ((td->td_flags & TRAVERSE_NO_DECRYPT) && + BP_IS_PROTECTED(rootbp)) + zio_flags |= ZIO_FLAG_RAW; + + err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func, + &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb); + if (err != 0) { + /* + * If both TRAVERSE_HARD and TRAVERSE_PRE are set, + * continue to visitbp so that td_func can be called + * in pre stage, and err will reset to zero. + */ + if (!(td->td_flags & TRAVERSE_HARD) || + !(td->td_flags & TRAVERSE_PRE)) + return (err); + } else { + osp = buf->b_data; + traverse_zil(td, &osp->os_zil_header); + arc_buf_destroy(buf, &buf); + } } - if (!(flags & TRAVERSE_PREFETCH) || - 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, - &td, TQ_NOQUEUE)) - pd.pd_exited = B_TRUE; + if (!(flags & TRAVERSE_PREFETCH_DATA) || + taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread, + td, TQ_NOQUEUE) == TASKQID_INVALID) + pd->pd_exited = B_TRUE; - SET_BOOKMARK(&czb, td.td_objset, - ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); - err = traverse_visitbp(&td, NULL, NULL, rootbp, &czb); + err = traverse_visitbp(td, NULL, rootbp, czb); - mutex_enter(&pd.pd_mtx); - pd.pd_cancel = B_TRUE; - cv_broadcast(&pd.pd_cv); - while (!pd.pd_exited) - cv_wait(&pd.pd_cv, &pd.pd_mtx); - mutex_exit(&pd.pd_mtx); + mutex_enter(&pd->pd_mtx); + pd->pd_cancel = B_TRUE; + cv_broadcast(&pd->pd_cv); + while (!pd->pd_exited) + cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); + mutex_exit(&pd->pd_mtx); - mutex_destroy(&pd.pd_mtx); - cv_destroy(&pd.pd_cv); + mutex_destroy(&pd->pd_mtx); + cv_destroy(&pd->pd_cv); + + kmem_free(czb, sizeof (zbookmark_phys_t)); + kmem_free(pd, sizeof (struct prefetch_data)); + kmem_free(td, sizeof (struct traverse_data)); return (err); } @@ -413,11 +687,28 @@ traverse_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *rootbp, * in syncing context). */ int -traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags, +traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, + zbookmark_phys_t *resume, + int flags, blkptr_cb_t func, void *arg) +{ + return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, + &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); +} + +int +traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, + int flags, blkptr_cb_t func, void *arg) +{ + return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); +} + +int +traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, + uint64_t txg_start, zbookmark_phys_t *resume, int flags, blkptr_cb_t func, void *arg) { - return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, - &ds->ds_phys->ds_bp, txg_start, flags, func, arg)); + return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, + blkptr, txg_start, resume, flags, func, arg)); } /* @@ -427,56 +718,66 @@ int traverse_pool(spa_t *spa, uint64_t txg_start, int flags, blkptr_cb_t func, void *arg) { - int err, lasterr = 0; - uint64_t obj; + int err; dsl_pool_t *dp = spa_get_dsl(spa); objset_t *mos = dp->dp_meta_objset; boolean_t hard = (flags & TRAVERSE_HARD); /* visit the MOS */ - err = traverse_impl(spa, NULL, spa_get_rootblkptr(spa), - txg_start, flags, func, arg); - if (err) + err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), + txg_start, NULL, flags, func, arg); + if (err != 0) return (err); /* visit each dataset */ - for (obj = 1; err == 0 || (err != ESRCH && hard); - err = dmu_object_next(mos, &obj, FALSE, txg_start)) { + for (uint64_t obj = 1; err == 0; + err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { dmu_object_info_t doi; err = dmu_object_info(mos, obj, &doi); - if (err) { - if (!hard) - return (err); - lasterr = err; - continue; + if (err != 0) { + if (hard) + continue; + break; } - if (doi.doi_type == DMU_OT_DSL_DATASET) { + if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { dsl_dataset_t *ds; uint64_t txg = txg_start; - rw_enter(&dp->dp_config_rwlock, RW_READER); + dsl_pool_config_enter(dp, FTAG); err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); - rw_exit(&dp->dp_config_rwlock); - if (err) { - if (!hard) - return (err); - lasterr = err; - continue; + dsl_pool_config_exit(dp, FTAG); + if (err != 0) { + if (hard) + continue; + break; } - if (ds->ds_phys->ds_prev_snap_txg > txg) - txg = ds->ds_phys->ds_prev_snap_txg; + if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) + txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; err = traverse_dataset(ds, txg, flags, func, arg); dsl_dataset_rele(ds, FTAG); - if (err) { - if (!hard) - return (err); - lasterr = err; - } + if (err != 0) + break; } } if (err == ESRCH) err = 0; - return (err != 0 ? err : lasterr); + return (err); } + +#if defined(_KERNEL) +EXPORT_SYMBOL(traverse_dataset); +EXPORT_SYMBOL(traverse_pool); + +module_param(zfs_pd_bytes_max, int, 0644); +MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch"); + +module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644); +MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time"); + +module_param_named(send_holes_without_birth_time, + send_holes_without_birth_time, int, 0644); +MODULE_PARM_DESC(send_holes_without_birth_time, + "Ignore hole_birth txg for zfs send"); +#endif