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. 23ad135b5dSChristopher Siden * Copyright (c) 2012 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> 3988b7b0f2SMatthew Ahrens 4044f92b7dSChris Kirby int zfs_pd_blks_max = 100; 4144f92b7dSChris Kirby 426e0cbcaaSMatthew Ahrens typedef struct prefetch_data { 4388b7b0f2SMatthew Ahrens kmutex_t pd_mtx; 4488b7b0f2SMatthew Ahrens kcondvar_t pd_cv; 4588b7b0f2SMatthew Ahrens int pd_blks_max; 4688b7b0f2SMatthew Ahrens int pd_blks_fetched; 4788b7b0f2SMatthew Ahrens int pd_flags; 4888b7b0f2SMatthew Ahrens boolean_t pd_cancel; 4988b7b0f2SMatthew Ahrens boolean_t pd_exited; 506e0cbcaaSMatthew Ahrens } prefetch_data_t; 5188b7b0f2SMatthew Ahrens 526e0cbcaaSMatthew Ahrens typedef struct traverse_data { 5388b7b0f2SMatthew Ahrens spa_t *td_spa; 5488b7b0f2SMatthew Ahrens uint64_t td_objset; 5588b7b0f2SMatthew Ahrens blkptr_t *td_rootbp; 5688b7b0f2SMatthew Ahrens uint64_t td_min_txg; 57ad135b5dSChristopher Siden zbookmark_t *td_resume; 5888b7b0f2SMatthew Ahrens int td_flags; 596e0cbcaaSMatthew Ahrens prefetch_data_t *td_pfd; 6088b7b0f2SMatthew Ahrens blkptr_cb_t *td_func; 6188b7b0f2SMatthew Ahrens void *td_arg; 626e0cbcaaSMatthew Ahrens } traverse_data_t; 63fa9e4066Sahrens 646e0cbcaaSMatthew Ahrens static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 6514843421SMatthew Ahrens arc_buf_t *buf, uint64_t objset, uint64_t object); 66*b4709335SMatthew Ahrens static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, 67*b4709335SMatthew Ahrens arc_buf_t *buf, uint64_t objset, uint64_t object); 6814843421SMatthew Ahrens 69b24ab676SJeff Bonwick static int 705dabedeeSbonwick traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 71ea8dc4b6Seschrock { 726e0cbcaaSMatthew Ahrens traverse_data_t *td = arg; 7388b7b0f2SMatthew Ahrens zbookmark_t zb; 74ea8dc4b6Seschrock 7588b7b0f2SMatthew Ahrens if (bp->blk_birth == 0) 76b24ab676SJeff Bonwick return (0); 775dabedeeSbonwick 7888b7b0f2SMatthew Ahrens if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) 79b24ab676SJeff Bonwick return (0); 8088b7b0f2SMatthew Ahrens 81b24ab676SJeff Bonwick SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, 82b24ab676SJeff Bonwick bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 83b24ab676SJeff Bonwick 843f9d6ad7SLin Ling (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, td->td_arg); 85b24ab676SJeff Bonwick 86b24ab676SJeff Bonwick return (0); 87ea8dc4b6Seschrock } 88ea8dc4b6Seschrock 89b24ab676SJeff Bonwick static int 905dabedeeSbonwick traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 91ea8dc4b6Seschrock { 926e0cbcaaSMatthew Ahrens traverse_data_t *td = arg; 93ea8dc4b6Seschrock 94ea8dc4b6Seschrock if (lrc->lrc_txtype == TX_WRITE) { 95ea8dc4b6Seschrock lr_write_t *lr = (lr_write_t *)lrc; 96ea8dc4b6Seschrock blkptr_t *bp = &lr->lr_blkptr; 9788b7b0f2SMatthew Ahrens zbookmark_t zb; 98ea8dc4b6Seschrock 9988b7b0f2SMatthew Ahrens if (bp->blk_birth == 0) 100b24ab676SJeff Bonwick return (0); 1015dabedeeSbonwick 10288b7b0f2SMatthew Ahrens if (claim_txg == 0 || bp->blk_birth < claim_txg) 103b24ab676SJeff Bonwick return (0); 104b24ab676SJeff Bonwick 1056e0cbcaaSMatthew Ahrens SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, 1066e0cbcaaSMatthew Ahrens ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); 10788b7b0f2SMatthew Ahrens 1083f9d6ad7SLin Ling (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, 109b24ab676SJeff Bonwick td->td_arg); 110ea8dc4b6Seschrock } 111b24ab676SJeff Bonwick return (0); 112ea8dc4b6Seschrock } 113ea8dc4b6Seschrock 114ea8dc4b6Seschrock static void 1156e0cbcaaSMatthew Ahrens traverse_zil(traverse_data_t *td, zil_header_t *zh) 116ea8dc4b6Seschrock { 1175dabedeeSbonwick uint64_t claim_txg = zh->zh_claim_txg; 118ea8dc4b6Seschrock zilog_t *zilog; 119ea8dc4b6Seschrock 1205dabedeeSbonwick /* 1215dabedeeSbonwick * We only want to visit blocks that have been claimed but not yet 122b24ab676SJeff Bonwick * replayed; plus, in read-only mode, blocks that are already stable. 1235dabedeeSbonwick */ 1248ad4d6ddSJeff Bonwick if (claim_txg == 0 && spa_writeable(td->td_spa)) 1255dabedeeSbonwick return; 1265dabedeeSbonwick 12788b7b0f2SMatthew Ahrens zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); 128ea8dc4b6Seschrock 12988b7b0f2SMatthew Ahrens (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, 1305dabedeeSbonwick claim_txg); 131ea8dc4b6Seschrock 132ea8dc4b6Seschrock zil_free(zilog); 133ea8dc4b6Seschrock } 134ea8dc4b6Seschrock 135ad135b5dSChristopher Siden typedef enum resume_skip { 136ad135b5dSChristopher Siden RESUME_SKIP_ALL, 137ad135b5dSChristopher Siden RESUME_SKIP_NONE, 138ad135b5dSChristopher Siden RESUME_SKIP_CHILDREN 139ad135b5dSChristopher Siden } resume_skip_t; 140ad135b5dSChristopher Siden 141ad135b5dSChristopher Siden /* 142ad135b5dSChristopher Siden * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and 143ad135b5dSChristopher Siden * the block indicated by zb does not need to be visited at all. Returns 144ad135b5dSChristopher Siden * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the 145ad135b5dSChristopher Siden * resume point. This indicates that this block should be visited but not its 146ad135b5dSChristopher Siden * children (since they must have been visited in a previous traversal). 147ad135b5dSChristopher Siden * Otherwise returns RESUME_SKIP_NONE. 148ad135b5dSChristopher Siden */ 149ad135b5dSChristopher Siden static resume_skip_t 150ad135b5dSChristopher Siden resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, 151ad135b5dSChristopher Siden const zbookmark_t *zb) 152ad135b5dSChristopher Siden { 153ad135b5dSChristopher Siden if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { 154ad135b5dSChristopher Siden /* 155ad135b5dSChristopher Siden * If we already visited this bp & everything below, 156ad135b5dSChristopher Siden * don't bother doing it again. 157ad135b5dSChristopher Siden */ 158ad135b5dSChristopher Siden if (zbookmark_is_before(dnp, zb, td->td_resume)) 159ad135b5dSChristopher Siden return (RESUME_SKIP_ALL); 160ad135b5dSChristopher Siden 161ad135b5dSChristopher Siden /* 162ad135b5dSChristopher Siden * If we found the block we're trying to resume from, zero 163ad135b5dSChristopher Siden * the bookmark out to indicate that we have resumed. 164ad135b5dSChristopher Siden */ 165ad135b5dSChristopher Siden ASSERT3U(zb->zb_object, <=, td->td_resume->zb_object); 166ad135b5dSChristopher Siden if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { 167ad135b5dSChristopher Siden bzero(td->td_resume, sizeof (*zb)); 168ad135b5dSChristopher Siden if (td->td_flags & TRAVERSE_POST) 169ad135b5dSChristopher Siden return (RESUME_SKIP_CHILDREN); 170ad135b5dSChristopher Siden } 171ad135b5dSChristopher Siden } 172ad135b5dSChristopher Siden return (RESUME_SKIP_NONE); 173ad135b5dSChristopher Siden } 174ad135b5dSChristopher Siden 175ad135b5dSChristopher Siden static void 176ad135b5dSChristopher Siden traverse_pause(traverse_data_t *td, const zbookmark_t *zb) 177ad135b5dSChristopher Siden { 178ad135b5dSChristopher Siden ASSERT(td->td_resume != NULL); 179b420f3adSRichard Lowe ASSERT3U(zb->zb_level, ==, 0); 180ad135b5dSChristopher Siden bcopy(zb, td->td_resume, sizeof (*td->td_resume)); 181ad135b5dSChristopher Siden } 182ad135b5dSChristopher Siden 183*b4709335SMatthew Ahrens static void 184*b4709335SMatthew Ahrens traverse_prefetch_metadata(traverse_data_t *td, 185*b4709335SMatthew Ahrens arc_buf_t *pbuf, const blkptr_t *bp, const zbookmark_t *zb) 186*b4709335SMatthew Ahrens { 187*b4709335SMatthew Ahrens uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; 188*b4709335SMatthew Ahrens 189*b4709335SMatthew Ahrens if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) 190*b4709335SMatthew Ahrens return; 191*b4709335SMatthew Ahrens /* 192*b4709335SMatthew Ahrens * If we are in the process of resuming, don't prefetch, because 193*b4709335SMatthew Ahrens * some children will not be needed (and in fact may have already 194*b4709335SMatthew Ahrens * been freed). 195*b4709335SMatthew Ahrens */ 196*b4709335SMatthew Ahrens if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) 197*b4709335SMatthew Ahrens return; 198*b4709335SMatthew Ahrens if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) 199*b4709335SMatthew Ahrens return; 200*b4709335SMatthew Ahrens if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) 201*b4709335SMatthew Ahrens return; 202*b4709335SMatthew Ahrens 203*b4709335SMatthew Ahrens (void) arc_read(NULL, td->td_spa, bp, 204*b4709335SMatthew Ahrens pbuf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 205*b4709335SMatthew Ahrens ZIO_FLAG_CANFAIL, &flags, zb); 206*b4709335SMatthew Ahrens } 207*b4709335SMatthew Ahrens 208fa9e4066Sahrens static int 2096e0cbcaaSMatthew Ahrens traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, 210*b4709335SMatthew Ahrens arc_buf_t *pbuf, const blkptr_t *bp, const zbookmark_t *zb) 211fa9e4066Sahrens { 2126a0f0066SEric Taylor zbookmark_t czb; 213cd088ea4SVictor Latushkin int err = 0, lasterr = 0; 21488b7b0f2SMatthew Ahrens arc_buf_t *buf = NULL; 2156e0cbcaaSMatthew Ahrens prefetch_data_t *pd = td->td_pfd; 216cd088ea4SVictor Latushkin boolean_t hard = td->td_flags & TRAVERSE_HARD; 217ad135b5dSChristopher Siden boolean_t pause = B_FALSE; 218ad135b5dSChristopher Siden 219ad135b5dSChristopher Siden switch (resume_skip_check(td, dnp, zb)) { 220ad135b5dSChristopher Siden case RESUME_SKIP_ALL: 221ad135b5dSChristopher Siden return (0); 222ad135b5dSChristopher Siden case RESUME_SKIP_CHILDREN: 223ad135b5dSChristopher Siden goto post; 224ad135b5dSChristopher Siden case RESUME_SKIP_NONE: 225ad135b5dSChristopher Siden break; 226ad135b5dSChristopher Siden default: 227ad135b5dSChristopher Siden ASSERT(0); 228ad135b5dSChristopher Siden } 229fa9e4066Sahrens 230ad135b5dSChristopher Siden if (BP_IS_HOLE(bp)) { 2313f9d6ad7SLin Ling err = td->td_func(td->td_spa, NULL, NULL, pbuf, zb, dnp, 2323f9d6ad7SLin Ling td->td_arg); 23388b7b0f2SMatthew Ahrens return (err); 234fa9e4066Sahrens } 235fa9e4066Sahrens 23688b7b0f2SMatthew Ahrens if (bp->blk_birth <= td->td_min_txg) 23788b7b0f2SMatthew Ahrens return (0); 238fa9e4066Sahrens 23988b7b0f2SMatthew Ahrens if (pd && !pd->pd_exited && 24088b7b0f2SMatthew Ahrens ((pd->pd_flags & TRAVERSE_PREFETCH_DATA) || 24188b7b0f2SMatthew Ahrens BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) { 24288b7b0f2SMatthew Ahrens mutex_enter(&pd->pd_mtx); 24388b7b0f2SMatthew Ahrens ASSERT(pd->pd_blks_fetched >= 0); 24488b7b0f2SMatthew Ahrens while (pd->pd_blks_fetched == 0 && !pd->pd_exited) 24588b7b0f2SMatthew Ahrens cv_wait(&pd->pd_cv, &pd->pd_mtx); 24688b7b0f2SMatthew Ahrens pd->pd_blks_fetched--; 24788b7b0f2SMatthew Ahrens cv_broadcast(&pd->pd_cv); 24888b7b0f2SMatthew Ahrens mutex_exit(&pd->pd_mtx); 249fa9e4066Sahrens } 250fa9e4066Sahrens 25188b7b0f2SMatthew Ahrens if (td->td_flags & TRAVERSE_PRE) { 2523f9d6ad7SLin Ling err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, 2533f9d6ad7SLin Ling td->td_arg); 25499d5e173STim Haley if (err == TRAVERSE_VISIT_NO_CHILDREN) 25599d5e173STim Haley return (0); 256ad135b5dSChristopher Siden if (err == ERESTART) 257ad135b5dSChristopher Siden pause = B_TRUE; /* handle pausing at a common point */ 258ad135b5dSChristopher Siden if (err != 0) 259ad135b5dSChristopher Siden goto post; 260fa9e4066Sahrens } 261fa9e4066Sahrens 26288b7b0f2SMatthew Ahrens if (BP_GET_LEVEL(bp) > 0) { 26388b7b0f2SMatthew Ahrens uint32_t flags = ARC_WAIT; 26488b7b0f2SMatthew Ahrens int i; 26588b7b0f2SMatthew Ahrens blkptr_t *cbp; 26688b7b0f2SMatthew Ahrens int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 26788b7b0f2SMatthew Ahrens 2683f9d6ad7SLin Ling err = dsl_read(NULL, td->td_spa, bp, pbuf, 26988b7b0f2SMatthew Ahrens arc_getbuf_func, &buf, 27088b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 27188b7b0f2SMatthew Ahrens if (err) 27288b7b0f2SMatthew Ahrens return (err); 273*b4709335SMatthew Ahrens cbp = buf->b_data; 274*b4709335SMatthew Ahrens 275*b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 276*b4709335SMatthew Ahrens SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 277*b4709335SMatthew Ahrens zb->zb_level - 1, 278*b4709335SMatthew Ahrens zb->zb_blkid * epb + i); 279*b4709335SMatthew Ahrens traverse_prefetch_metadata(td, buf, &cbp[i], &czb); 280*b4709335SMatthew Ahrens } 28188b7b0f2SMatthew Ahrens 28288b7b0f2SMatthew Ahrens /* recursively visitbp() blocks below this */ 283*b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 28488b7b0f2SMatthew Ahrens SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 28588b7b0f2SMatthew Ahrens zb->zb_level - 1, 28688b7b0f2SMatthew Ahrens zb->zb_blkid * epb + i); 287*b4709335SMatthew Ahrens err = traverse_visitbp(td, dnp, buf, &cbp[i], &czb); 288cd088ea4SVictor Latushkin if (err) { 289cd088ea4SVictor Latushkin if (!hard) 290cd088ea4SVictor Latushkin break; 291cd088ea4SVictor Latushkin lasterr = err; 292cd088ea4SVictor Latushkin } 29388b7b0f2SMatthew Ahrens } 29488b7b0f2SMatthew Ahrens } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 29588b7b0f2SMatthew Ahrens uint32_t flags = ARC_WAIT; 29614843421SMatthew Ahrens int i; 29788b7b0f2SMatthew Ahrens int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 29888b7b0f2SMatthew Ahrens 2993f9d6ad7SLin Ling err = dsl_read(NULL, td->td_spa, bp, pbuf, 30088b7b0f2SMatthew Ahrens arc_getbuf_func, &buf, 30188b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 30288b7b0f2SMatthew Ahrens if (err) 30388b7b0f2SMatthew Ahrens return (err); 304*b4709335SMatthew Ahrens dnp = buf->b_data; 305*b4709335SMatthew Ahrens 306*b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 307*b4709335SMatthew Ahrens prefetch_dnode_metadata(td, &dnp[i], buf, zb->zb_objset, 308*b4709335SMatthew Ahrens zb->zb_blkid * epb + i); 309*b4709335SMatthew Ahrens } 31088b7b0f2SMatthew Ahrens 31188b7b0f2SMatthew Ahrens /* recursively visitbp() blocks below this */ 312*b4709335SMatthew Ahrens for (i = 0; i < epb; i++) { 313*b4709335SMatthew Ahrens err = traverse_dnode(td, &dnp[i], buf, zb->zb_objset, 31414843421SMatthew Ahrens zb->zb_blkid * epb + i); 315cd088ea4SVictor Latushkin if (err) { 316cd088ea4SVictor Latushkin if (!hard) 317cd088ea4SVictor Latushkin break; 318cd088ea4SVictor Latushkin lasterr = err; 319cd088ea4SVictor Latushkin } 320fa9e4066Sahrens } 32188b7b0f2SMatthew Ahrens } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 32288b7b0f2SMatthew Ahrens uint32_t flags = ARC_WAIT; 32388b7b0f2SMatthew Ahrens objset_phys_t *osp; 32414843421SMatthew Ahrens dnode_phys_t *dnp; 32588b7b0f2SMatthew Ahrens 3263f9d6ad7SLin Ling err = dsl_read_nolock(NULL, td->td_spa, bp, 32788b7b0f2SMatthew Ahrens arc_getbuf_func, &buf, 32888b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 32988b7b0f2SMatthew Ahrens if (err) 33088b7b0f2SMatthew Ahrens return (err); 33188b7b0f2SMatthew Ahrens 33288b7b0f2SMatthew Ahrens osp = buf->b_data; 33314843421SMatthew Ahrens dnp = &osp->os_meta_dnode; 334*b4709335SMatthew Ahrens prefetch_dnode_metadata(td, dnp, buf, zb->zb_objset, 335*b4709335SMatthew Ahrens DMU_META_DNODE_OBJECT); 336*b4709335SMatthew Ahrens if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { 337*b4709335SMatthew Ahrens prefetch_dnode_metadata(td, &osp->os_userused_dnode, 338*b4709335SMatthew Ahrens buf, zb->zb_objset, DMU_USERUSED_OBJECT); 339*b4709335SMatthew Ahrens prefetch_dnode_metadata(td, &osp->os_groupused_dnode, 340*b4709335SMatthew Ahrens buf, zb->zb_objset, DMU_USERUSED_OBJECT); 341*b4709335SMatthew Ahrens } 342*b4709335SMatthew Ahrens 343b24ab676SJeff Bonwick err = traverse_dnode(td, dnp, buf, zb->zb_objset, 344b24ab676SJeff Bonwick DMU_META_DNODE_OBJECT); 345cd088ea4SVictor Latushkin if (err && hard) { 346cd088ea4SVictor Latushkin lasterr = err; 347cd088ea4SVictor Latushkin err = 0; 348cd088ea4SVictor Latushkin } 34914843421SMatthew Ahrens if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 35014843421SMatthew Ahrens dnp = &osp->os_userused_dnode; 35114843421SMatthew Ahrens err = traverse_dnode(td, dnp, buf, zb->zb_objset, 35214843421SMatthew Ahrens DMU_USERUSED_OBJECT); 35314843421SMatthew Ahrens } 354cd088ea4SVictor Latushkin if (err && hard) { 355cd088ea4SVictor Latushkin lasterr = err; 356cd088ea4SVictor Latushkin err = 0; 357cd088ea4SVictor Latushkin } 35814843421SMatthew Ahrens if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { 35914843421SMatthew Ahrens dnp = &osp->os_groupused_dnode; 36014843421SMatthew Ahrens err = traverse_dnode(td, dnp, buf, zb->zb_objset, 36114843421SMatthew Ahrens DMU_GROUPUSED_OBJECT); 36288b7b0f2SMatthew Ahrens } 36388b7b0f2SMatthew Ahrens } 364fa9e4066Sahrens 36588b7b0f2SMatthew Ahrens if (buf) 36688b7b0f2SMatthew Ahrens (void) arc_buf_remove_ref(buf, &buf); 367fa9e4066Sahrens 368ad135b5dSChristopher Siden post: 3693f9d6ad7SLin Ling if (err == 0 && lasterr == 0 && (td->td_flags & TRAVERSE_POST)) { 3703f9d6ad7SLin Ling err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, 3713f9d6ad7SLin Ling td->td_arg); 372ad135b5dSChristopher Siden if (err == ERESTART) 373ad135b5dSChristopher Siden pause = B_TRUE; 374ad135b5dSChristopher Siden } 375ad135b5dSChristopher Siden 376ad135b5dSChristopher Siden if (pause && td->td_resume != NULL) { 377ad135b5dSChristopher Siden ASSERT3U(err, ==, ERESTART); 378ad135b5dSChristopher Siden ASSERT(!hard); 379ad135b5dSChristopher Siden traverse_pause(td, zb); 3803f9d6ad7SLin Ling } 381fa9e4066Sahrens 382cd088ea4SVictor Latushkin return (err != 0 ? err : lasterr); 383fa9e4066Sahrens } 384fa9e4066Sahrens 385*b4709335SMatthew Ahrens static void 386*b4709335SMatthew Ahrens prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, 387*b4709335SMatthew Ahrens arc_buf_t *buf, uint64_t objset, uint64_t object) 388*b4709335SMatthew Ahrens { 389*b4709335SMatthew Ahrens int j; 390*b4709335SMatthew Ahrens zbookmark_t czb; 391*b4709335SMatthew Ahrens 392*b4709335SMatthew Ahrens for (j = 0; j < dnp->dn_nblkptr; j++) { 393*b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 394*b4709335SMatthew Ahrens traverse_prefetch_metadata(td, buf, &dnp->dn_blkptr[j], &czb); 395*b4709335SMatthew Ahrens } 396*b4709335SMatthew Ahrens 397*b4709335SMatthew Ahrens if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 398*b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 399*b4709335SMatthew Ahrens traverse_prefetch_metadata(td, buf, &dnp->dn_spill, &czb); 400*b4709335SMatthew Ahrens } 401*b4709335SMatthew Ahrens } 402*b4709335SMatthew Ahrens 40314843421SMatthew Ahrens static int 4046e0cbcaaSMatthew Ahrens traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, 40514843421SMatthew Ahrens arc_buf_t *buf, uint64_t objset, uint64_t object) 40614843421SMatthew Ahrens { 407cd088ea4SVictor Latushkin int j, err = 0, lasterr = 0; 40814843421SMatthew Ahrens zbookmark_t czb; 409cd088ea4SVictor Latushkin boolean_t hard = (td->td_flags & TRAVERSE_HARD); 41014843421SMatthew Ahrens 41114843421SMatthew Ahrens for (j = 0; j < dnp->dn_nblkptr; j++) { 41214843421SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); 413*b4709335SMatthew Ahrens err = traverse_visitbp(td, dnp, buf, &dnp->dn_blkptr[j], &czb); 414cd088ea4SVictor Latushkin if (err) { 415cd088ea4SVictor Latushkin if (!hard) 416cd088ea4SVictor Latushkin break; 417cd088ea4SVictor Latushkin lasterr = err; 418cd088ea4SVictor Latushkin } 4193f9d6ad7SLin Ling } 4203f9d6ad7SLin Ling 4213f9d6ad7SLin Ling if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 422*b4709335SMatthew Ahrens SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); 423*b4709335SMatthew Ahrens err = traverse_visitbp(td, dnp, buf, &dnp->dn_spill, &czb); 4243f9d6ad7SLin Ling if (err) { 4253f9d6ad7SLin Ling if (!hard) 4263f9d6ad7SLin Ling return (err); 4273f9d6ad7SLin Ling lasterr = err; 4280a586ceaSMark Shellenbaum } 42914843421SMatthew Ahrens } 430cd088ea4SVictor Latushkin return (err != 0 ? err : lasterr); 43114843421SMatthew Ahrens } 43214843421SMatthew Ahrens 43388b7b0f2SMatthew Ahrens /* ARGSUSED */ 43488b7b0f2SMatthew Ahrens static int 435b24ab676SJeff Bonwick traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 4363f9d6ad7SLin Ling arc_buf_t *pbuf, const zbookmark_t *zb, const dnode_phys_t *dnp, 4373f9d6ad7SLin Ling void *arg) 438e7cbe64fSgw { 4396e0cbcaaSMatthew Ahrens prefetch_data_t *pfd = arg; 44088b7b0f2SMatthew Ahrens uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 441e7cbe64fSgw 44288b7b0f2SMatthew Ahrens ASSERT(pfd->pd_blks_fetched >= 0); 44388b7b0f2SMatthew Ahrens if (pfd->pd_cancel) 44488b7b0f2SMatthew Ahrens return (EINTR); 445e7cbe64fSgw 44688b7b0f2SMatthew Ahrens if (bp == NULL || !((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || 4476e1f5caaSNeil Perrin BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0) || 4486e1f5caaSNeil Perrin BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) 449fa9e4066Sahrens return (0); 450fa9e4066Sahrens 45188b7b0f2SMatthew Ahrens mutex_enter(&pfd->pd_mtx); 45288b7b0f2SMatthew Ahrens while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max) 45388b7b0f2SMatthew Ahrens cv_wait(&pfd->pd_cv, &pfd->pd_mtx); 45488b7b0f2SMatthew Ahrens pfd->pd_blks_fetched++; 45588b7b0f2SMatthew Ahrens cv_broadcast(&pfd->pd_cv); 45688b7b0f2SMatthew Ahrens mutex_exit(&pfd->pd_mtx); 457fa9e4066Sahrens 4583f9d6ad7SLin Ling (void) dsl_read(NULL, spa, bp, pbuf, NULL, NULL, 45988b7b0f2SMatthew Ahrens ZIO_PRIORITY_ASYNC_READ, 46088b7b0f2SMatthew Ahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 46188b7b0f2SMatthew Ahrens &aflags, zb); 462fa9e4066Sahrens 46388b7b0f2SMatthew Ahrens return (0); 464fa9e4066Sahrens } 465fa9e4066Sahrens 466fa9e4066Sahrens static void 46788b7b0f2SMatthew Ahrens traverse_prefetch_thread(void *arg) 468fa9e4066Sahrens { 4696e0cbcaaSMatthew Ahrens traverse_data_t *td_main = arg; 4706e0cbcaaSMatthew Ahrens traverse_data_t td = *td_main; 47188b7b0f2SMatthew Ahrens zbookmark_t czb; 472fa9e4066Sahrens 47388b7b0f2SMatthew Ahrens td.td_func = traverse_prefetcher; 47488b7b0f2SMatthew Ahrens td.td_arg = td_main->td_pfd; 47588b7b0f2SMatthew Ahrens td.td_pfd = NULL; 476fa9e4066Sahrens 477b24ab676SJeff Bonwick SET_BOOKMARK(&czb, td.td_objset, 478b24ab676SJeff Bonwick ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 47988b7b0f2SMatthew Ahrens (void) traverse_visitbp(&td, NULL, NULL, td.td_rootbp, &czb); 480fa9e4066Sahrens 48188b7b0f2SMatthew Ahrens mutex_enter(&td_main->td_pfd->pd_mtx); 48288b7b0f2SMatthew Ahrens td_main->td_pfd->pd_exited = B_TRUE; 48388b7b0f2SMatthew Ahrens cv_broadcast(&td_main->td_pfd->pd_cv); 48488b7b0f2SMatthew Ahrens mutex_exit(&td_main->td_pfd->pd_mtx); 485fa9e4066Sahrens } 486fa9e4066Sahrens 48788b7b0f2SMatthew Ahrens /* 48888b7b0f2SMatthew Ahrens * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 48988b7b0f2SMatthew Ahrens * in syncing context). 49088b7b0f2SMatthew Ahrens */ 49188b7b0f2SMatthew Ahrens static int 492ad135b5dSChristopher Siden traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, 493ad135b5dSChristopher Siden uint64_t txg_start, zbookmark_t *resume, int flags, 494ad135b5dSChristopher Siden blkptr_cb_t func, void *arg) 495fa9e4066Sahrens { 4966e0cbcaaSMatthew Ahrens traverse_data_t td; 4976e0cbcaaSMatthew Ahrens prefetch_data_t pd = { 0 }; 49888b7b0f2SMatthew Ahrens zbookmark_t czb; 49988b7b0f2SMatthew Ahrens int err; 500fa9e4066Sahrens 501ad135b5dSChristopher Siden ASSERT(ds == NULL || objset == ds->ds_object); 502ad135b5dSChristopher Siden ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); 503ad135b5dSChristopher Siden 504*b4709335SMatthew Ahrens /* 505*b4709335SMatthew Ahrens * The data prefetching mechanism (the prefetch thread) is incompatible 506*b4709335SMatthew Ahrens * with resuming from a bookmark. 507*b4709335SMatthew Ahrens */ 508*b4709335SMatthew Ahrens ASSERT(resume == NULL || !(flags & TRAVERSE_PREFETCH_DATA)); 509*b4709335SMatthew Ahrens 51088b7b0f2SMatthew Ahrens td.td_spa = spa; 511ad135b5dSChristopher Siden td.td_objset = objset; 51288b7b0f2SMatthew Ahrens td.td_rootbp = rootbp; 51388b7b0f2SMatthew Ahrens td.td_min_txg = txg_start; 514ad135b5dSChristopher Siden td.td_resume = resume; 51588b7b0f2SMatthew Ahrens td.td_func = func; 51688b7b0f2SMatthew Ahrens td.td_arg = arg; 51788b7b0f2SMatthew Ahrens td.td_pfd = &pd; 51888b7b0f2SMatthew Ahrens td.td_flags = flags; 51988b7b0f2SMatthew Ahrens 52044f92b7dSChris Kirby pd.pd_blks_max = zfs_pd_blks_max; 52188b7b0f2SMatthew Ahrens pd.pd_flags = flags; 52288b7b0f2SMatthew Ahrens mutex_init(&pd.pd_mtx, NULL, MUTEX_DEFAULT, NULL); 52388b7b0f2SMatthew Ahrens cv_init(&pd.pd_cv, NULL, CV_DEFAULT, NULL); 52488b7b0f2SMatthew Ahrens 5256e0cbcaaSMatthew Ahrens /* See comment on ZIL traversal in dsl_scan_visitds. */ 5266e0cbcaaSMatthew Ahrens if (ds != NULL && !dsl_dataset_is_snapshot(ds)) { 5276e0cbcaaSMatthew Ahrens objset_t *os; 5286e0cbcaaSMatthew Ahrens 5296e0cbcaaSMatthew Ahrens err = dmu_objset_from_ds(ds, &os); 5306e0cbcaaSMatthew Ahrens if (err) 5316e0cbcaaSMatthew Ahrens return (err); 5326e0cbcaaSMatthew Ahrens 5336e0cbcaaSMatthew Ahrens traverse_zil(&td, &os->os_zil_header); 5346e0cbcaaSMatthew Ahrens } 5356e0cbcaaSMatthew Ahrens 536*b4709335SMatthew Ahrens if (!(flags & TRAVERSE_PREFETCH_DATA) || 53788b7b0f2SMatthew Ahrens 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, 53888b7b0f2SMatthew Ahrens &td, TQ_NOQUEUE)) 53988b7b0f2SMatthew Ahrens pd.pd_exited = B_TRUE; 54088b7b0f2SMatthew Ahrens 5416e0cbcaaSMatthew Ahrens SET_BOOKMARK(&czb, td.td_objset, 542b24ab676SJeff Bonwick ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 54388b7b0f2SMatthew Ahrens err = traverse_visitbp(&td, NULL, NULL, rootbp, &czb); 54488b7b0f2SMatthew Ahrens 54588b7b0f2SMatthew Ahrens mutex_enter(&pd.pd_mtx); 54688b7b0f2SMatthew Ahrens pd.pd_cancel = B_TRUE; 54788b7b0f2SMatthew Ahrens cv_broadcast(&pd.pd_cv); 54888b7b0f2SMatthew Ahrens while (!pd.pd_exited) 54988b7b0f2SMatthew Ahrens cv_wait(&pd.pd_cv, &pd.pd_mtx); 55088b7b0f2SMatthew Ahrens mutex_exit(&pd.pd_mtx); 55188b7b0f2SMatthew Ahrens 55288b7b0f2SMatthew Ahrens mutex_destroy(&pd.pd_mtx); 55388b7b0f2SMatthew Ahrens cv_destroy(&pd.pd_cv); 554fa9e4066Sahrens 55588b7b0f2SMatthew Ahrens return (err); 556fa9e4066Sahrens } 557fa9e4066Sahrens 55888b7b0f2SMatthew Ahrens /* 55988b7b0f2SMatthew Ahrens * NB: dataset must not be changing on-disk (eg, is a snapshot or we are 56088b7b0f2SMatthew Ahrens * in syncing context). 56188b7b0f2SMatthew Ahrens */ 56288b7b0f2SMatthew Ahrens int 56388b7b0f2SMatthew Ahrens traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags, 56488b7b0f2SMatthew Ahrens blkptr_cb_t func, void *arg) 565fa9e4066Sahrens { 566ad135b5dSChristopher Siden return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, 567ad135b5dSChristopher Siden &ds->ds_phys->ds_bp, txg_start, NULL, flags, func, arg)); 568ad135b5dSChristopher Siden } 569ad135b5dSChristopher Siden 570ad135b5dSChristopher Siden int 571ad135b5dSChristopher Siden traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, 572ad135b5dSChristopher Siden uint64_t txg_start, zbookmark_t *resume, int flags, 573ad135b5dSChristopher Siden blkptr_cb_t func, void *arg) 574ad135b5dSChristopher Siden { 575ad135b5dSChristopher Siden return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, 576ad135b5dSChristopher Siden blkptr, txg_start, resume, flags, func, arg)); 577fa9e4066Sahrens } 578fa9e4066Sahrens 57988b7b0f2SMatthew Ahrens /* 58088b7b0f2SMatthew Ahrens * NB: pool must not be changing on-disk (eg, from zdb or sync context). 58188b7b0f2SMatthew Ahrens */ 58288b7b0f2SMatthew Ahrens int 583bbfd46c4SJeff Bonwick traverse_pool(spa_t *spa, uint64_t txg_start, int flags, 584bbfd46c4SJeff Bonwick blkptr_cb_t func, void *arg) 585fa9e4066Sahrens { 586cd088ea4SVictor Latushkin int err, lasterr = 0; 58788b7b0f2SMatthew Ahrens uint64_t obj; 58888b7b0f2SMatthew Ahrens dsl_pool_t *dp = spa_get_dsl(spa); 58988b7b0f2SMatthew Ahrens objset_t *mos = dp->dp_meta_objset; 590cd088ea4SVictor Latushkin boolean_t hard = (flags & TRAVERSE_HARD); 59188b7b0f2SMatthew Ahrens 59288b7b0f2SMatthew Ahrens /* visit the MOS */ 593ad135b5dSChristopher Siden err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), 594ad135b5dSChristopher Siden txg_start, NULL, flags, func, arg); 59588b7b0f2SMatthew Ahrens if (err) 59688b7b0f2SMatthew Ahrens return (err); 59788b7b0f2SMatthew Ahrens 59888b7b0f2SMatthew Ahrens /* visit each dataset */ 599cd088ea4SVictor Latushkin for (obj = 1; err == 0 || (err != ESRCH && hard); 600cd088ea4SVictor Latushkin err = dmu_object_next(mos, &obj, FALSE, txg_start)) { 60188b7b0f2SMatthew Ahrens dmu_object_info_t doi; 60288b7b0f2SMatthew Ahrens 60388b7b0f2SMatthew Ahrens err = dmu_object_info(mos, obj, &doi); 604cd088ea4SVictor Latushkin if (err) { 605cd088ea4SVictor Latushkin if (!hard) 606cd088ea4SVictor Latushkin return (err); 607cd088ea4SVictor Latushkin lasterr = err; 608cd088ea4SVictor Latushkin continue; 609cd088ea4SVictor Latushkin } 61088b7b0f2SMatthew Ahrens 61188b7b0f2SMatthew Ahrens if (doi.doi_type == DMU_OT_DSL_DATASET) { 61288b7b0f2SMatthew Ahrens dsl_dataset_t *ds; 613468c413aSTim Haley uint64_t txg = txg_start; 614468c413aSTim Haley 61588b7b0f2SMatthew Ahrens rw_enter(&dp->dp_config_rwlock, RW_READER); 61688b7b0f2SMatthew Ahrens err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 61788b7b0f2SMatthew Ahrens rw_exit(&dp->dp_config_rwlock); 618cd088ea4SVictor Latushkin if (err) { 619cd088ea4SVictor Latushkin if (!hard) 620cd088ea4SVictor Latushkin return (err); 621cd088ea4SVictor Latushkin lasterr = err; 622cd088ea4SVictor Latushkin continue; 623cd088ea4SVictor Latushkin } 624468c413aSTim Haley if (ds->ds_phys->ds_prev_snap_txg > txg) 625468c413aSTim Haley txg = ds->ds_phys->ds_prev_snap_txg; 626bbfd46c4SJeff Bonwick err = traverse_dataset(ds, txg, flags, func, arg); 62788b7b0f2SMatthew Ahrens dsl_dataset_rele(ds, FTAG); 628cd088ea4SVictor Latushkin if (err) { 629cd088ea4SVictor Latushkin if (!hard) 630cd088ea4SVictor Latushkin return (err); 631cd088ea4SVictor Latushkin lasterr = err; 632cd088ea4SVictor Latushkin } 63388b7b0f2SMatthew Ahrens } 634fa9e4066Sahrens } 63588b7b0f2SMatthew Ahrens if (err == ESRCH) 63688b7b0f2SMatthew Ahrens err = 0; 637cd088ea4SVictor Latushkin return (err != 0 ? err : lasterr); 638fa9e4066Sahrens } 639