1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23286ef713SPaul Dagnelie * Copyright (c) 2012, 2016 by Delphix. All rights reserved. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27fa9e4066Sahrens #include <sys/dmu_objset.h> 28fa9e4066Sahrens #include <sys/dmu_traverse.h> 29fa9e4066Sahrens #include <sys/dsl_dataset.h> 30fa9e4066Sahrens #include <sys/dsl_dir.h> 31fa9e4066Sahrens #include <sys/dsl_pool.h> 32fa9e4066Sahrens #include <sys/dnode.h> 33fa9e4066Sahrens #include <sys/spa.h> 34fa9e4066Sahrens #include <sys/zio.h> 35fa9e4066Sahrens #include <sys/dmu_impl.h> 360a586ceaSMark Shellenbaum #include <sys/sa.h> 370a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 3888b7b0f2SMatthew Ahrens #include <sys/callb.h> 3943466aaeSMax Grossman #include <sys/zfeature.h> 4088b7b0f2SMatthew Ahrens 4134d7ce05SGeorge Wilson int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ 42*f76886deSPaul Dagnelie boolean_t send_holes_without_birth_time = B_TRUE; 4344f92b7dSChris Kirby 446e0cbcaaSMatthew Ahrens typedef struct prefetch_data { 4588b7b0f2SMatthew Ahrens kmutex_t pd_mtx; 4688b7b0f2SMatthew Ahrens kcondvar_t pd_cv; 4734d7ce05SGeorge Wilson int32_t pd_bytes_fetched; 4888b7b0f2SMatthew Ahrens int pd_flags; 4988b7b0f2SMatthew Ahrens boolean_t pd_cancel; 5088b7b0f2SMatthew Ahrens boolean_t pd_exited; 519c3fd121SMatthew Ahrens zbookmark_phys_t pd_resume; 526e0cbcaaSMatthew Ahrens } prefetch_data_t; 5388b7b0f2SMatthew Ahrens 546e0cbcaaSMatthew Ahrens typedef struct traverse_data { 5588b7b0f2SMatthew Ahrens spa_t *td_spa; 5688b7b0f2SMatthew Ahrens uint64_t td_objset; 5788b7b0f2SMatthew Ahrens blkptr_t *td_rootbp; 5888b7b0f2SMatthew Ahrens uint64_t td_min_txg; 597802d7bfSMatthew Ahrens zbookmark_phys_t *td_resume; 6088b7b0f2SMatthew Ahrens int td_flags; 616e0cbcaaSMatthew Ahrens prefetch_data_t *td_pfd; 627fd05ac4SMatthew Ahrens boolean_t td_paused; 63f7950bf1SMatthew Ahrens uint64_t td_hole_birth_enabled_txg; 6488b7b0f2SMatthew Ahrens blkptr_cb_t *td_func; 6588b7b0f2SMatthew Ahrens void *td_arg; 66286ef713SPaul Dagnelie boolean_t td_realloc_possible; 676e0cbcaaSMatthew Ahrens } traverse_data_t; 68fa9e4066Sahrens 696e0cbcaaSMatthew Ahrens static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 701b912ec7SGeorge Wilson uint64_t objset, uint64_t object); 71b4709335SMatthew Ahrens static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, 721b912ec7SGeorge Wilson uint64_t objset, uint64_t object); 7314843421SMatthew Ahrens 74b24ab676SJeff Bonwick static int 755dabedeeSbonwick traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 76ea8dc4b6Seschrock { 776e0cbcaaSMatthew Ahrens traverse_data_t *td = arg; 787802d7bfSMatthew Ahrens zbookmark_phys_t zb; 79ea8dc4b6Seschrock 8043466aaeSMax Grossman if (BP_IS_HOLE(bp)) 81b24ab676SJeff Bonwick return (0); 825dabedeeSbonwick 8388b7b0f2SMatthew Ahrens if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) 84b24ab676SJeff Bonwick return (0); 8588b7b0f2SMatthew Ahrens 86b24ab676SJeff Bonwick SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 87b24ab676SJeff Bonwick bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 88b24ab676SJeff Bonwick 891b912ec7SGeorge Wilson (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); 90b24ab676SJeff Bonwick 91b24ab676SJeff Bonwick return (0); 92ea8dc4b6Seschrock } 93ea8dc4b6Seschrock 94b24ab676SJeff Bonwick static int 955dabedeeSbonwick traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 96ea8dc4b6Seschrock { 976e0cbcaaSMatthew Ahrens traverse_data_t *td = arg; 98ea8dc4b6Seschrock 99ea8dc4b6Seschrock if (lrc->lrc_txtype == TX_WRITE) { 100ea8dc4b6Seschrock lr_write_t *lr = (lr_write_t *)lrc; 101ea8dc4b6Seschrock blkptr_t *bp = &lr->lr_blkptr; 1027802d7bfSMatthew Ahrens zbookmark_phys_t zb; 103ea8dc4b6Seschrock 10443466aaeSMax Grossman if (BP_IS_HOLE(bp)) 105b24ab676SJeff Bonwick return (0); 1065dabedeeSbonwick 10788b7b0f2SMatthew Ahrens if (claim_txg == 0 || bp->blk_birth < claim_txg) 108b24ab676SJeff Bonwick return (0); 109b24ab676SJeff Bonwick 1106e0cbcaaSMatthew Ahrens SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, 1116e0cbcaaSMatthew Ahrens ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 11288b7b0f2SMatthew Ahrens 1131b912ec7SGeorge Wilson (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, 114b24ab676SJeff Bonwick td->td_arg); 115ea8dc4b6Seschrock } 116b24ab676SJeff Bonwick return (0); 117ea8dc4b6Seschrock } 118ea8dc4b6Seschrock 119ea8dc4b6Seschrock static void 1206e0cbcaaSMatthew Ahrens traverse_zil(traverse_data_t *td, zil_header_t *zh) 121ea8dc4b6Seschrock { 1225dabedeeSbonwick uint64_t claim_txg = zh->zh_claim_txg; 123ea8dc4b6Seschrock zilog_t *zilog; 124ea8dc4b6Seschrock 1255dabedeeSbonwick /* 1265dabedeeSbonwick * We only want to visit blocks that have been claimed but not yet 127b24ab676SJeff Bonwick * replayed; plus, in read-only mode, blocks that are already stable. 1285dabedeeSbonwick */ 1298ad4d6ddSJeff Bonwick if (claim_txg == 0 && spa_writeable(td->td_spa)) 1305dabedeeSbonwick return; 1315dabedeeSbonwick 13288b7b0f2SMatthew Ahrens zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); 133ea8dc4b6Seschrock 13488b7b0f2SMatthew Ahrens (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, 1355dabedeeSbonwick claim_txg); 136ea8dc4b6Seschrock 137ea8dc4b6Seschrock zil_free(zilog); 138ea8dc4b6Seschrock } 139ea8dc4b6Seschrock 140ad135b5dSChristopher Siden typedef enum resume_skip { 141ad135b5dSChristopher Siden RESUME_SKIP_ALL, 142ad135b5dSChristopher Siden RESUME_SKIP_NONE, 143ad135b5dSChristopher Siden RESUME_SKIP_CHILDREN 144ad135b5dSChristopher Siden } resume_skip_t; 145ad135b5dSChristopher Siden 146ad135b5dSChristopher Siden /* 147ad135b5dSChristopher Siden * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and 148ad135b5dSChristopher Siden * the block indicated by zb does not need to be visited at all. Returns 149ad135b5dSChristopher Siden * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the 150ad135b5dSChristopher Siden * resume point. This indicates that this block should be visited but not its 151ad135b5dSChristopher Siden * children (since they must have been visited in a previous traversal). 152ad135b5dSChristopher Siden * Otherwise returns RESUME_SKIP_NONE. 153ad135b5dSChristopher Siden */ 154ad135b5dSChristopher Siden static resume_skip_t 155ad135b5dSChristopher Siden resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, 1567802d7bfSMatthew Ahrens const zbookmark_phys_t *zb) 157ad135b5dSChristopher Siden { 158ad135b5dSChristopher Siden if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { 159ad135b5dSChristopher Siden /* 160ad135b5dSChristopher Siden * If we already visited this bp & everything below, 161ad135b5dSChristopher Siden * don't bother doing it again. 162ad135b5dSChristopher Siden */ 163a2cdcdd2SPaul Dagnelie if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) 164ad135b5dSChristopher Siden return (RESUME_SKIP_ALL); 165ad135b5dSChristopher Siden 166ad135b5dSChristopher Siden /* 167ad135b5dSChristopher Siden * If we found the block we're trying to resume from, zero 168ad135b5dSChristopher Siden * the bookmark out to indicate that we have resumed. 169ad135b5dSChristopher Siden */ 170ad135b5dSChristopher Siden if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { 171ad135b5dSChristopher Siden bzero(td->td_resume, sizeof (*zb)); 172ad135b5dSChristopher Siden if (td->td_flags & TRAVERSE_POST) 173ad135b5dSChristopher Siden return (RESUME_SKIP_CHILDREN); 174ad135b5dSChristopher Siden } 175ad135b5dSChristopher Siden } 176ad135b5dSChristopher Siden return (RESUME_SKIP_NONE); 177ad135b5dSChristopher Siden } 178ad135b5dSChristopher Siden 179b4709335SMatthew Ahrens static void 180b4709335SMatthew Ahrens traverse_prefetch_metadata(traverse_data_t *td, 1817802d7bfSMatthew Ahrens const blkptr_t *bp, const zbookmark_phys_t *zb) 182b4709335SMatthew Ahrens { 1837adb730bSGeorge Wilson arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 184b4709335SMatthew Ahrens 185b4709335SMatthew Ahrens if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) 186b4709335SMatthew Ahrens return; 187b4709335SMatthew Ahrens /* 188b4709335SMatthew Ahrens * If we are in the process of resuming, don't prefetch, because 189b4709335SMatthew Ahrens * some children will not be needed (and in fact may have already 190b4709335SMatthew Ahrens * been freed). 191b4709335SMatthew Ahrens */ 192b4709335SMatthew Ahrens if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) 193b4709335SMatthew Ahrens return; 194b4709335SMatthew Ahrens if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) 195b4709335SMatthew Ahrens return; 196b4709335SMatthew Ahrens if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) 197b4709335SMatthew Ahrens return; 198b4709335SMatthew Ahrens 1991b912ec7SGeorge Wilson (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, 2001b912ec7SGeorge Wilson ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 201b4709335SMatthew Ahrens } 202b4709335SMatthew Ahrens 20306315b79SMatthew Ahrens static boolean_t 20406315b79SMatthew Ahrens prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) 20506315b79SMatthew Ahrens { 20606315b79SMatthew Ahrens ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); 20706315b79SMatthew Ahrens if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || 20806315b79SMatthew Ahrens BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) 20906315b79SMatthew Ahrens return (B_FALSE); 21006315b79SMatthew Ahrens return (B_TRUE); 21106315b79SMatthew Ahrens } 21206315b79SMatthew Ahrens 213fa9e4066Sahrens static int 2146e0cbcaaSMatthew Ahrens traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, 2157802d7bfSMatthew Ahrens const blkptr_t *bp, const zbookmark_phys_t *zb) 216fa9e4066Sahrens { 2177802d7bfSMatthew Ahrens zbookmark_phys_t czb; 2187fd05ac4SMatthew Ahrens int err = 0; 21988b7b0f2SMatthew Ahrens arc_buf_t *buf = NULL; 2206e0cbcaaSMatthew Ahrens prefetch_data_t *pd = td->td_pfd; 221cd088ea4SVictor Latushkin boolean_t hard = td->td_flags & TRAVERSE_HARD; 222ad135b5dSChristopher Siden 223ad135b5dSChristopher Siden switch (resume_skip_check(td, dnp, zb)) { 224ad135b5dSChristopher Siden case RESUME_SKIP_ALL: 225ad135b5dSChristopher Siden return (0); 226ad135b5dSChristopher Siden case RESUME_SKIP_CHILDREN: 227ad135b5dSChristopher Siden goto post; 228ad135b5dSChristopher Siden case RESUME_SKIP_NONE: 229ad135b5dSChristopher Siden break; 230ad135b5dSChristopher Siden default: 231ad135b5dSChristopher Siden ASSERT(0); 232ad135b5dSChristopher Siden } 233fa9e4066Sahrens 23443466aaeSMax Grossman if (bp->blk_birth == 0) { 235f7950bf1SMatthew Ahrens /* 236286ef713SPaul Dagnelie * Since this block has a birth time of 0 it must be one of 237286ef713SPaul Dagnelie * two things: a hole created before the 238286ef713SPaul Dagnelie * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole 239286ef713SPaul Dagnelie * which has always been a hole in an object. 240286ef713SPaul Dagnelie * 241286ef713SPaul Dagnelie * If a file is written sparsely, then the unwritten parts of 242286ef713SPaul Dagnelie * the file were "always holes" -- that is, they have been 243286ef713SPaul Dagnelie * holes since this object was allocated. However, we (and 244286ef713SPaul Dagnelie * our callers) can not necessarily tell when an object was 245286ef713SPaul Dagnelie * allocated. Therefore, if it's possible that this object 246286ef713SPaul Dagnelie * was freed and then its object number reused, we need to 247286ef713SPaul Dagnelie * visit all the holes with birth==0. 248286ef713SPaul Dagnelie * 249286ef713SPaul Dagnelie * If it isn't possible that the object number was reused, 250286ef713SPaul Dagnelie * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote 251286ef713SPaul Dagnelie * all the blocks we will visit as part of this traversal, 252286ef713SPaul Dagnelie * then this hole must have always existed, so we can skip 253286ef713SPaul Dagnelie * it. We visit blocks born after (exclusive) td_min_txg. 254286ef713SPaul Dagnelie * 255286ef713SPaul Dagnelie * Note that the meta-dnode cannot be reallocated. 256f7950bf1SMatthew Ahrens */ 257*f76886deSPaul Dagnelie if (!send_holes_without_birth_time && 258*f76886deSPaul Dagnelie (!td->td_realloc_possible || 259286ef713SPaul Dagnelie zb->zb_object == DMU_META_DNODE_OBJECT) && 260286ef713SPaul Dagnelie td->td_hole_birth_enabled_txg <= td->td_min_txg) 261f7950bf1SMatthew Ahrens return (0); 26243466aaeSMax Grossman } else if (bp->blk_birth <= td->td_min_txg) { 26343466aaeSMax Grossman return (0); 26443466aaeSMax Grossman } 26543466aaeSMax Grossman 26606315b79SMatthew Ahrens if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { 26734d7ce05SGeorge Wilson uint64_t size = BP_GET_LSIZE(bp); 26888b7b0f2SMatthew Ahrens mutex_enter(&pd->pd_mtx); 26934d7ce05SGeorge Wilson ASSERT(pd->pd_bytes_fetched >= 0); 27034d7ce05SGeorge Wilson while (pd->pd_bytes_fetched < size && !pd->pd_exited) 27188b7b0f2SMatthew Ahrens cv_wait(&pd->pd_cv, &pd->pd_mtx); 27234d7ce05SGeorge Wilson pd->pd_bytes_fetched -= size; 27388b7b0f2SMatthew Ahrens cv_broadcast(&pd->pd_cv); 27488b7b0f2SMatthew Ahrens mutex_exit(&pd->pd_mtx); 275fa9e4066Sahrens } 276fa9e4066Sahrens 27706315b79SMatthew Ahrens if (BP_IS_HOLE(bp)) { 27806315b79SMatthew Ahrens err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 27906315b79SMatthew Ahrens if (err != 0) 28006315b79SMatthew Ahrens goto post; 28106315b79SMatthew Ahrens return (0); 28206315b79SMatthew Ahrens } 28306315b79SMatthew Ahrens 28488b7b0f2SMatthew Ahrens if (td->td_flags & TRAVERSE_PRE) { 2851b912ec7SGeorge Wilson err = td->td_func(td->td_spa, NULL, bp, zb, dnp, 2863f9d6ad7SLin Ling td->td_arg); 28799d5e173STim Haley if (err == TRAVERSE_VISIT_NO_CHILDREN) 28899d5e173STim Haley return (0); 289ad135b5dSChristopher Siden if (err != 0) 290ad135b5dSChristopher Siden goto post; 291fa9e4066Sahrens } 292fa9e4066Sahrens 29388b7b0f2SMatthew Ahrens if (BP_GET_LEVEL(bp) > 0) { 2947adb730bSGeorge Wilson arc_flags_t flags = ARC_FLAG_WAIT; 29588b7b0f2SMatthew Ahrens int i; 29688b7b0f2SMatthew Ahrens blkptr_t *cbp; 29788b7b0f2SMatthew Ahrens int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 29888b7b0f2SMatthew Ahrens 2991b912ec7SGeorge Wilson err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 30088b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 3013b2aab18SMatthew Ahrens if (err != 0) 3027fd05ac4SMatthew Ahrens goto post; 303b4709335SMatthew Ahrens cbp = buf->b_data; 304b4709335SMatthew Ahrens 305b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 306b4709335SMatthew Ahrens SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 307b4709335SMatthew Ahrens zb->zb_level - 1, 308b4709335SMatthew Ahrens zb->zb_blkid * epb + i); 3091b912ec7SGeorge Wilson traverse_prefetch_metadata(td, &cbp[i], &czb); 310b4709335SMatthew Ahrens } 31188b7b0f2SMatthew Ahrens 31288b7b0f2SMatthew Ahrens /* recursively visitbp() blocks below this */ 313b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 31488b7b0f2SMatthew Ahrens SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 31588b7b0f2SMatthew Ahrens zb->zb_level - 1, 31688b7b0f2SMatthew Ahrens zb->zb_blkid * epb + i); 3171b912ec7SGeorge Wilson err = traverse_visitbp(td, dnp, &cbp[i], &czb); 3187fd05ac4SMatthew Ahrens if (err != 0) 3197fd05ac4SMatthew Ahrens break; 32088b7b0f2SMatthew Ahrens } 32188b7b0f2SMatthew Ahrens } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 3227adb730bSGeorge Wilson arc_flags_t flags = ARC_FLAG_WAIT; 32314843421SMatthew Ahrens int i; 32488b7b0f2SMatthew Ahrens int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 32588b7b0f2SMatthew Ahrens 3261b912ec7SGeorge Wilson err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 32788b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 3283b2aab18SMatthew Ahrens if (err != 0) 3297fd05ac4SMatthew Ahrens goto post; 3309c3fd121SMatthew Ahrens dnode_phys_t *child_dnp = buf->b_data; 331b4709335SMatthew Ahrens 332b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 3339c3fd121SMatthew Ahrens prefetch_dnode_metadata(td, &child_dnp[i], 3349c3fd121SMatthew Ahrens zb->zb_objset, zb->zb_blkid * epb + i); 335b4709335SMatthew Ahrens } 33688b7b0f2SMatthew Ahrens 33788b7b0f2SMatthew Ahrens /* recursively visitbp() blocks below this */ 338b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 3399c3fd121SMatthew Ahrens err = traverse_dnode(td, &child_dnp[i], 3409c3fd121SMatthew Ahrens zb->zb_objset, zb->zb_blkid * epb + i); 3417fd05ac4SMatthew Ahrens if (err != 0) 3427fd05ac4SMatthew Ahrens break; 343fa9e4066Sahrens } 34488b7b0f2SMatthew Ahrens } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 3457adb730bSGeorge Wilson arc_flags_t flags = ARC_FLAG_WAIT; 34688b7b0f2SMatthew Ahrens 3471b912ec7SGeorge Wilson err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, 34888b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 3493b2aab18SMatthew Ahrens if (err != 0) 3507fd05ac4SMatthew Ahrens goto post; 35188b7b0f2SMatthew Ahrens 3529c3fd121SMatthew Ahrens objset_phys_t *osp = buf->b_data; 3539c3fd121SMatthew Ahrens prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, 354b4709335SMatthew Ahrens DMU_META_DNODE_OBJECT); 355286ef713SPaul Dagnelie /* 356286ef713SPaul Dagnelie * See the block comment above for the goal of this variable. 357286ef713SPaul Dagnelie * If the maxblkid of the meta-dnode is 0, then we know that 358286ef713SPaul Dagnelie * we've never had more than DNODES_PER_BLOCK objects in the 359286ef713SPaul Dagnelie * dataset, which means we can't have reused any object ids. 360286ef713SPaul Dagnelie */ 361286ef713SPaul Dagnelie if (osp->os_meta_dnode.dn_maxblkid == 0) 362286ef713SPaul Dagnelie td->td_realloc_possible = B_FALSE; 363286ef713SPaul Dagnelie 364b4709335SMatthew Ahrens if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { 365b4709335SMatthew Ahrens prefetch_dnode_metadata(td, &osp->os_groupused_dnode, 36648f1b90eSMatthew Ahrens zb->zb_objset, DMU_GROUPUSED_OBJECT); 36748f1b90eSMatthew Ahrens prefetch_dnode_metadata(td, &osp->os_userused_dnode, 3681b912ec7SGeorge Wilson zb->zb_objset, DMU_USERUSED_OBJECT); 369b4709335SMatthew Ahrens } 370b4709335SMatthew Ahrens 3719c3fd121SMatthew Ahrens err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, 372b24ab676SJeff Bonwick DMU_META_DNODE_OBJECT); 37314843421SMatthew Ahrens if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 3749c3fd121SMatthew Ahrens err = traverse_dnode(td, &osp->os_groupused_dnode, 3759c3fd121SMatthew Ahrens zb->zb_objset, DMU_GROUPUSED_OBJECT); 37614843421SMatthew Ahrens } 37714843421SMatthew Ahrens if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 3789c3fd121SMatthew Ahrens err = traverse_dnode(td, &osp->os_userused_dnode, 3799c3fd121SMatthew Ahrens zb->zb_objset, DMU_USERUSED_OBJECT); 38088b7b0f2SMatthew Ahrens } 38188b7b0f2SMatthew Ahrens } 382fa9e4066Sahrens 38388b7b0f2SMatthew Ahrens if (buf) 384dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, &buf); 385fa9e4066Sahrens 386ad135b5dSChristopher Siden post: 3877fd05ac4SMatthew Ahrens if (err == 0 && (td->td_flags & TRAVERSE_POST)) 3881b912ec7SGeorge Wilson err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); 3897fd05ac4SMatthew Ahrens 3907fd05ac4SMatthew Ahrens if (hard && (err == EIO || err == ECKSUM)) { 3917fd05ac4SMatthew Ahrens /* 3927fd05ac4SMatthew Ahrens * Ignore this disk error as requested by the HARD flag, 3937fd05ac4SMatthew Ahrens * and continue traversal. 3947fd05ac4SMatthew Ahrens */ 3957fd05ac4SMatthew Ahrens err = 0; 396ad135b5dSChristopher Siden } 397ad135b5dSChristopher Siden 3987fd05ac4SMatthew Ahrens /* 3997fd05ac4SMatthew Ahrens * If we are stopping here, set td_resume. 4007fd05ac4SMatthew Ahrens */ 4017fd05ac4SMatthew Ahrens if (td->td_resume != NULL && err != 0 && !td->td_paused) { 4027fd05ac4SMatthew Ahrens td->td_resume->zb_objset = zb->zb_objset; 4037fd05ac4SMatthew Ahrens td->td_resume->zb_object = zb->zb_object; 4047fd05ac4SMatthew Ahrens td->td_resume->zb_level = 0; 4057fd05ac4SMatthew Ahrens /* 4067fd05ac4SMatthew Ahrens * If we have stopped on an indirect block (e.g. due to 4077fd05ac4SMatthew Ahrens * i/o error), we have not visited anything below it. 4087fd05ac4SMatthew Ahrens * Set the bookmark to the first level-0 block that we need 4097fd05ac4SMatthew Ahrens * to visit. This way, the resuming code does not need to 4107fd05ac4SMatthew Ahrens * deal with resuming from indirect blocks. 4119c3fd121SMatthew Ahrens * 4129c3fd121SMatthew Ahrens * Note, if zb_level <= 0, dnp may be NULL, so we don't want 4139c3fd121SMatthew Ahrens * to dereference it. 4147fd05ac4SMatthew Ahrens */ 4159c3fd121SMatthew Ahrens td->td_resume->zb_blkid = zb->zb_blkid; 4169c3fd121SMatthew Ahrens if (zb->zb_level > 0) { 4179c3fd121SMatthew Ahrens td->td_resume->zb_blkid <<= zb->zb_level * 4189c3fd121SMatthew Ahrens (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); 4199c3fd121SMatthew Ahrens } 4207fd05ac4SMatthew Ahrens td->td_paused = B_TRUE; 4213f9d6ad7SLin Ling } 422fa9e4066Sahrens 4237fd05ac4SMatthew Ahrens return (err); 424fa9e4066Sahrens } 425fa9e4066Sahrens 426b4709335SMatthew Ahrens static void 427b4709335SMatthew Ahrens prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, 4281b912ec7SGeorge Wilson uint64_t objset, uint64_t object) 429b4709335SMatthew Ahrens { 430b4709335SMatthew Ahrens int j; 4317802d7bfSMatthew Ahrens zbookmark_phys_t czb; 432b4709335SMatthew Ahrens 433b4709335SMatthew Ahrens for (j = 0; j < dnp->dn_nblkptr; j++) { 434b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 4351b912ec7SGeorge Wilson traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); 436b4709335SMatthew Ahrens } 437b4709335SMatthew Ahrens 438b4709335SMatthew Ahrens if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 439b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 4401b912ec7SGeorge Wilson traverse_prefetch_metadata(td, &dnp->dn_spill, &czb); 441b4709335SMatthew Ahrens } 442b4709335SMatthew Ahrens } 443b4709335SMatthew Ahrens 44414843421SMatthew Ahrens static int 4456e0cbcaaSMatthew Ahrens traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 4461b912ec7SGeorge Wilson uint64_t objset, uint64_t object) 44714843421SMatthew Ahrens { 4487fd05ac4SMatthew Ahrens int j, err = 0; 4497802d7bfSMatthew Ahrens zbookmark_phys_t czb; 45014843421SMatthew Ahrens 4519c3fd121SMatthew Ahrens if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && 4529c3fd121SMatthew Ahrens object < td->td_resume->zb_object) 4539c3fd121SMatthew Ahrens return (0); 4549c3fd121SMatthew Ahrens 455a2cdcdd2SPaul Dagnelie if (td->td_flags & TRAVERSE_PRE) { 456a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 457a2cdcdd2SPaul Dagnelie ZB_DNODE_BLKID); 458a2cdcdd2SPaul Dagnelie err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 459a2cdcdd2SPaul Dagnelie td->td_arg); 460a2cdcdd2SPaul Dagnelie if (err == TRAVERSE_VISIT_NO_CHILDREN) 461a2cdcdd2SPaul Dagnelie return (0); 462a2cdcdd2SPaul Dagnelie if (err != 0) 463a2cdcdd2SPaul Dagnelie return (err); 464a2cdcdd2SPaul Dagnelie } 465a2cdcdd2SPaul Dagnelie 46614843421SMatthew Ahrens for (j = 0; j < dnp->dn_nblkptr; j++) { 46714843421SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 4681b912ec7SGeorge Wilson err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); 4697fd05ac4SMatthew Ahrens if (err != 0) 4707fd05ac4SMatthew Ahrens break; 4713f9d6ad7SLin Ling } 4723f9d6ad7SLin Ling 473a2cdcdd2SPaul Dagnelie if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { 474b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 4751b912ec7SGeorge Wilson err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb); 47614843421SMatthew Ahrens } 477a2cdcdd2SPaul Dagnelie 478a2cdcdd2SPaul Dagnelie if (err == 0 && (td->td_flags & TRAVERSE_POST)) { 479a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, 480a2cdcdd2SPaul Dagnelie ZB_DNODE_BLKID); 481a2cdcdd2SPaul Dagnelie err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, 482a2cdcdd2SPaul Dagnelie td->td_arg); 483a2cdcdd2SPaul Dagnelie if (err == TRAVERSE_VISIT_NO_CHILDREN) 484a2cdcdd2SPaul Dagnelie return (0); 485a2cdcdd2SPaul Dagnelie if (err != 0) 486a2cdcdd2SPaul Dagnelie return (err); 487a2cdcdd2SPaul Dagnelie } 4887fd05ac4SMatthew Ahrens return (err); 48914843421SMatthew Ahrens } 49014843421SMatthew Ahrens 49188b7b0f2SMatthew Ahrens /* ARGSUSED */ 49288b7b0f2SMatthew Ahrens static int 493b24ab676SJeff Bonwick traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 4947802d7bfSMatthew Ahrens const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 495e7cbe64fSgw { 4966e0cbcaaSMatthew Ahrens prefetch_data_t *pfd = arg; 4977adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 498e7cbe64fSgw 49934d7ce05SGeorge Wilson ASSERT(pfd->pd_bytes_fetched >= 0); 500a2cdcdd2SPaul Dagnelie if (bp == NULL) 501a2cdcdd2SPaul Dagnelie return (0); 50288b7b0f2SMatthew Ahrens if (pfd->pd_cancel) 503be6fd75aSMatthew Ahrens return (SET_ERROR(EINTR)); 504e7cbe64fSgw 50506315b79SMatthew Ahrens if (!prefetch_needed(pfd, bp)) 506fa9e4066Sahrens return (0); 507fa9e4066Sahrens 50888b7b0f2SMatthew Ahrens mutex_enter(&pfd->pd_mtx); 50934d7ce05SGeorge Wilson while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) 51088b7b0f2SMatthew Ahrens cv_wait(&pfd->pd_cv, &pfd->pd_mtx); 51134d7ce05SGeorge Wilson pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); 51288b7b0f2SMatthew Ahrens cv_broadcast(&pfd->pd_cv); 51388b7b0f2SMatthew Ahrens mutex_exit(&pfd->pd_mtx); 514fa9e4066Sahrens 5151b912ec7SGeorge Wilson (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 5161b912ec7SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); 517fa9e4066Sahrens 51888b7b0f2SMatthew Ahrens return (0); 519fa9e4066Sahrens } 520fa9e4066Sahrens 521fa9e4066Sahrens static void 52288b7b0f2SMatthew Ahrens traverse_prefetch_thread(void *arg) 523fa9e4066Sahrens { 5246e0cbcaaSMatthew Ahrens traverse_data_t *td_main = arg; 5256e0cbcaaSMatthew Ahrens traverse_data_t td = *td_main; 5267802d7bfSMatthew Ahrens zbookmark_phys_t czb; 527fa9e4066Sahrens 52888b7b0f2SMatthew Ahrens td.td_func = traverse_prefetcher; 52988b7b0f2SMatthew Ahrens td.td_arg = td_main->td_pfd; 53088b7b0f2SMatthew Ahrens td.td_pfd = NULL; 5319c3fd121SMatthew Ahrens td.td_resume = &td_main->td_pfd->pd_resume; 532fa9e4066Sahrens 533b24ab676SJeff Bonwick SET_BOOKMARK(&czb, td.td_objset, 534b24ab676SJeff Bonwick ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 5351b912ec7SGeorge Wilson (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); 536fa9e4066Sahrens 53788b7b0f2SMatthew Ahrens mutex_enter(&td_main->td_pfd->pd_mtx); 53888b7b0f2SMatthew Ahrens td_main->td_pfd->pd_exited = B_TRUE; 53988b7b0f2SMatthew Ahrens cv_broadcast(&td_main->td_pfd->pd_cv); 54088b7b0f2SMatthew Ahrens mutex_exit(&td_main->td_pfd->pd_mtx); 541fa9e4066Sahrens } 542fa9e4066Sahrens 54388b7b0f2SMatthew Ahrens /* 54488b7b0f2SMatthew Ahrens * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 54588b7b0f2SMatthew Ahrens * in syncing context). 54688b7b0f2SMatthew Ahrens */ 54788b7b0f2SMatthew Ahrens static int 548ad135b5dSChristopher Siden traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, 5497802d7bfSMatthew Ahrens uint64_t txg_start, zbookmark_phys_t *resume, int flags, 550ad135b5dSChristopher Siden blkptr_cb_t func, void *arg) 551fa9e4066Sahrens { 5526e0cbcaaSMatthew Ahrens traverse_data_t td; 5536e0cbcaaSMatthew Ahrens prefetch_data_t pd = { 0 }; 5547802d7bfSMatthew Ahrens zbookmark_phys_t czb; 55588b7b0f2SMatthew Ahrens int err; 556fa9e4066Sahrens 557ad135b5dSChristopher Siden ASSERT(ds == NULL || objset == ds->ds_object); 558ad135b5dSChristopher Siden ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); 559ad135b5dSChristopher Siden 56088b7b0f2SMatthew Ahrens td.td_spa = spa; 561ad135b5dSChristopher Siden td.td_objset = objset; 56288b7b0f2SMatthew Ahrens td.td_rootbp = rootbp; 56388b7b0f2SMatthew Ahrens td.td_min_txg = txg_start; 564ad135b5dSChristopher Siden td.td_resume = resume; 56588b7b0f2SMatthew Ahrens td.td_func = func; 56688b7b0f2SMatthew Ahrens td.td_arg = arg; 56788b7b0f2SMatthew Ahrens td.td_pfd = &pd; 56888b7b0f2SMatthew Ahrens td.td_flags = flags; 5697fd05ac4SMatthew Ahrens td.td_paused = B_FALSE; 570286ef713SPaul Dagnelie td.td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); 57188b7b0f2SMatthew Ahrens 572f7950bf1SMatthew Ahrens if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { 573f7950bf1SMatthew Ahrens VERIFY(spa_feature_enabled_txg(spa, 574f7950bf1SMatthew Ahrens SPA_FEATURE_HOLE_BIRTH, &td.td_hole_birth_enabled_txg)); 575f7950bf1SMatthew Ahrens } else { 576286ef713SPaul Dagnelie td.td_hole_birth_enabled_txg = UINT64_MAX; 577f7950bf1SMatthew Ahrens } 578f7950bf1SMatthew Ahrens 57988b7b0f2SMatthew Ahrens pd.pd_flags = flags; 5809c3fd121SMatthew Ahrens if (resume != NULL) 5819c3fd121SMatthew Ahrens pd.pd_resume = *resume; 58288b7b0f2SMatthew Ahrens mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); 58388b7b0f2SMatthew Ahrens cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); 58488b7b0f2SMatthew Ahrens 5856e0cbcaaSMatthew Ahrens /* See comment on ZIL traversal in dsl_scan_visitds. */ 586bc9014e6SJustin Gibbs if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { 5877adb730bSGeorge Wilson arc_flags_t flags = ARC_FLAG_WAIT; 5883b2aab18SMatthew Ahrens objset_phys_t *osp; 5893b2aab18SMatthew Ahrens arc_buf_t *buf; 5906e0cbcaaSMatthew Ahrens 5913b2aab18SMatthew Ahrens err = arc_read(NULL, td.td_spa, rootbp, 5923b2aab18SMatthew Ahrens arc_getbuf_func, &buf, 5933b2aab18SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, NULL); 5943b2aab18SMatthew Ahrens if (err != 0) 5956e0cbcaaSMatthew Ahrens return (err); 5966e0cbcaaSMatthew Ahrens 5973b2aab18SMatthew Ahrens osp = buf->b_data; 5983b2aab18SMatthew Ahrens traverse_zil(&td, &osp->os_zil_header); 599dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, &buf); 6006e0cbcaaSMatthew Ahrens } 6016e0cbcaaSMatthew Ahrens 602b4709335SMatthew Ahrens if (!(flags & TRAVERSE_PREFETCH_DATA) || 60388b7b0f2SMatthew Ahrens 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, 60488b7b0f2SMatthew Ahrens &td, TQ_NOQUEUE)) 60588b7b0f2SMatthew Ahrens pd.pd_exited = B_TRUE; 60688b7b0f2SMatthew Ahrens 6076e0cbcaaSMatthew Ahrens SET_BOOKMARK(&czb, td.td_objset, 608b24ab676SJeff Bonwick ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 6091b912ec7SGeorge Wilson err = traverse_visitbp(&td, NULL, rootbp, &czb); 61088b7b0f2SMatthew Ahrens 61188b7b0f2SMatthew Ahrens mutex_enter(&pd.pd_mtx); 61288b7b0f2SMatthew Ahrens pd.pd_cancel = B_TRUE; 61388b7b0f2SMatthew Ahrens cv_broadcast(&pd.pd_cv); 61488b7b0f2SMatthew Ahrens while (!pd.pd_exited) 61588b7b0f2SMatthew Ahrens cv_wait(&pd.pd_cv, &pd.pd_mtx); 61688b7b0f2SMatthew Ahrens mutex_exit(&pd.pd_mtx); 61788b7b0f2SMatthew Ahrens 61888b7b0f2SMatthew Ahrens mutex_destroy(&pd.pd_mtx); 61988b7b0f2SMatthew Ahrens cv_destroy(&pd.pd_cv); 620fa9e4066Sahrens 62188b7b0f2SMatthew Ahrens return (err); 622fa9e4066Sahrens } 623fa9e4066Sahrens 62488b7b0f2SMatthew Ahrens /* 62588b7b0f2SMatthew Ahrens * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 62688b7b0f2SMatthew Ahrens * in syncing context). 62788b7b0f2SMatthew Ahrens */ 62888b7b0f2SMatthew Ahrens int 6299c3fd121SMatthew Ahrens traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, 6309c3fd121SMatthew Ahrens zbookmark_phys_t *resume, 6319c3fd121SMatthew Ahrens int flags, blkptr_cb_t func, void *arg) 632fa9e4066Sahrens { 633ad135b5dSChristopher Siden return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, 6349c3fd121SMatthew Ahrens &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); 6359c3fd121SMatthew Ahrens } 6369c3fd121SMatthew Ahrens 6379c3fd121SMatthew Ahrens int 6389c3fd121SMatthew Ahrens traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, 6399c3fd121SMatthew Ahrens int flags, blkptr_cb_t func, void *arg) 6409c3fd121SMatthew Ahrens { 6419c3fd121SMatthew Ahrens return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); 642ad135b5dSChristopher Siden } 643ad135b5dSChristopher Siden 644ad135b5dSChristopher Siden int 645ad135b5dSChristopher Siden traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, 6467802d7bfSMatthew Ahrens uint64_t txg_start, zbookmark_phys_t *resume, int flags, 647ad135b5dSChristopher Siden blkptr_cb_t func, void *arg) 648ad135b5dSChristopher Siden { 649ad135b5dSChristopher Siden return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, 650ad135b5dSChristopher Siden blkptr, txg_start, resume, flags, func, arg)); 651fa9e4066Sahrens } 652fa9e4066Sahrens 65388b7b0f2SMatthew Ahrens /* 65488b7b0f2SMatthew Ahrens * NB: pool must not be changing on-disk (eg, from zdb or sync context). 65588b7b0f2SMatthew Ahrens */ 65688b7b0f2SMatthew Ahrens int 657bbfd46c4SJeff Bonwick traverse_pool(spa_t *spa, uint64_t txg_start, int flags, 658bbfd46c4SJeff Bonwick blkptr_cb_t func, void *arg) 659fa9e4066Sahrens { 6607fd05ac4SMatthew Ahrens int err; 66188b7b0f2SMatthew Ahrens dsl_pool_t *dp = spa_get_dsl(spa); 66288b7b0f2SMatthew Ahrens objset_t *mos = dp->dp_meta_objset; 663cd088ea4SVictor Latushkin boolean_t hard = (flags & TRAVERSE_HARD); 66488b7b0f2SMatthew Ahrens 66588b7b0f2SMatthew Ahrens /* visit the MOS */ 666ad135b5dSChristopher Siden err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), 667ad135b5dSChristopher Siden txg_start, NULL, flags, func, arg); 6683b2aab18SMatthew Ahrens if (err != 0) 66988b7b0f2SMatthew Ahrens return (err); 67088b7b0f2SMatthew Ahrens 67188b7b0f2SMatthew Ahrens /* visit each dataset */ 6729c3fd121SMatthew Ahrens for (uint64_t obj = 1; err == 0; 6739c3fd121SMatthew Ahrens err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { 67488b7b0f2SMatthew Ahrens dmu_object_info_t doi; 67588b7b0f2SMatthew Ahrens 67688b7b0f2SMatthew Ahrens err = dmu_object_info(mos, obj, &doi); 6773b2aab18SMatthew Ahrens if (err != 0) { 6787fd05ac4SMatthew Ahrens if (hard) 6797fd05ac4SMatthew Ahrens continue; 6807fd05ac4SMatthew Ahrens break; 681cd088ea4SVictor Latushkin } 68288b7b0f2SMatthew Ahrens 6832acef22dSMatthew Ahrens if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { 68488b7b0f2SMatthew Ahrens dsl_dataset_t *ds; 685468c413aSTim Haley uint64_t txg = txg_start; 686468c413aSTim Haley 6873b2aab18SMatthew Ahrens dsl_pool_config_enter(dp, FTAG); 68888b7b0f2SMatthew Ahrens err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 6893b2aab18SMatthew Ahrens dsl_pool_config_exit(dp, FTAG); 6903b2aab18SMatthew Ahrens if (err != 0) { 6917fd05ac4SMatthew Ahrens if (hard) 6927fd05ac4SMatthew Ahrens continue; 6937fd05ac4SMatthew Ahrens break; 694cd088ea4SVictor Latushkin } 695c1379625SJustin T. Gibbs if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) 696c1379625SJustin T. Gibbs txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 697bbfd46c4SJeff Bonwick err = traverse_dataset(ds, txg, flags, func, arg); 69888b7b0f2SMatthew Ahrens dsl_dataset_rele(ds, FTAG); 6997fd05ac4SMatthew Ahrens if (err != 0) 7007fd05ac4SMatthew Ahrens break; 70188b7b0f2SMatthew Ahrens } 702fa9e4066Sahrens } 70388b7b0f2SMatthew Ahrens if (err == ESRCH) 70488b7b0f2SMatthew Ahrens err = 0; 7057fd05ac4SMatthew Ahrens return (err); 706fa9e4066Sahrens } 707