1*3f9d6ad7SLin Ling /* 2*3f9d6ad7SLin Ling * CDDL HEADER START 3*3f9d6ad7SLin Ling * 4*3f9d6ad7SLin Ling * The contents of this file are subject to the terms of the 5*3f9d6ad7SLin Ling * Common Development and Distribution License (the "License"). 6*3f9d6ad7SLin Ling * You may not use this file except in compliance with the License. 7*3f9d6ad7SLin Ling * 8*3f9d6ad7SLin Ling * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*3f9d6ad7SLin Ling * or http://www.opensolaris.org/os/licensing. 10*3f9d6ad7SLin Ling * See the License for the specific language governing permissions 11*3f9d6ad7SLin Ling * and limitations under the License. 12*3f9d6ad7SLin Ling * 13*3f9d6ad7SLin Ling * When distributing Covered Code, include this CDDL HEADER in each 14*3f9d6ad7SLin Ling * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*3f9d6ad7SLin Ling * If applicable, add the following below this CDDL HEADER, with the 16*3f9d6ad7SLin Ling * fields enclosed by brackets "[]" replaced with your own identifying 17*3f9d6ad7SLin Ling * information: Portions Copyright [yyyy] [name of copyright owner] 18*3f9d6ad7SLin Ling * 19*3f9d6ad7SLin Ling * CDDL HEADER END 20*3f9d6ad7SLin Ling */ 21*3f9d6ad7SLin Ling /* 22*3f9d6ad7SLin Ling * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 23*3f9d6ad7SLin Ling */ 24*3f9d6ad7SLin Ling 25*3f9d6ad7SLin Ling #include <sys/dsl_scan.h> 26*3f9d6ad7SLin Ling #include <sys/dsl_pool.h> 27*3f9d6ad7SLin Ling #include <sys/dsl_dataset.h> 28*3f9d6ad7SLin Ling #include <sys/dsl_prop.h> 29*3f9d6ad7SLin Ling #include <sys/dsl_dir.h> 30*3f9d6ad7SLin Ling #include <sys/dsl_synctask.h> 31*3f9d6ad7SLin Ling #include <sys/dnode.h> 32*3f9d6ad7SLin Ling #include <sys/dmu_tx.h> 33*3f9d6ad7SLin Ling #include <sys/dmu_objset.h> 34*3f9d6ad7SLin Ling #include <sys/arc.h> 35*3f9d6ad7SLin Ling #include <sys/zap.h> 36*3f9d6ad7SLin Ling #include <sys/zio.h> 37*3f9d6ad7SLin Ling #include <sys/zfs_context.h> 38*3f9d6ad7SLin Ling #include <sys/fs/zfs.h> 39*3f9d6ad7SLin Ling #include <sys/zfs_znode.h> 40*3f9d6ad7SLin Ling #include <sys/spa_impl.h> 41*3f9d6ad7SLin Ling #include <sys/vdev_impl.h> 42*3f9d6ad7SLin Ling #include <sys/zil_impl.h> 43*3f9d6ad7SLin Ling #include <sys/zio_checksum.h> 44*3f9d6ad7SLin Ling #include <sys/ddt.h> 45*3f9d6ad7SLin Ling #include <sys/sa.h> 46*3f9d6ad7SLin Ling #include <sys/sa_impl.h> 47*3f9d6ad7SLin Ling #ifdef _KERNEL 48*3f9d6ad7SLin Ling #include <sys/zfs_vfsops.h> 49*3f9d6ad7SLin Ling #endif 50*3f9d6ad7SLin Ling 51*3f9d6ad7SLin Ling typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, const zbookmark_t *); 52*3f9d6ad7SLin Ling 53*3f9d6ad7SLin Ling static scan_cb_t dsl_scan_defrag_cb; 54*3f9d6ad7SLin Ling static scan_cb_t dsl_scan_scrub_cb; 55*3f9d6ad7SLin Ling static scan_cb_t dsl_scan_remove_cb; 56*3f9d6ad7SLin Ling static dsl_syncfunc_t dsl_scan_cancel_sync; 57*3f9d6ad7SLin Ling static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx); 58*3f9d6ad7SLin Ling 59*3f9d6ad7SLin Ling int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */ 60*3f9d6ad7SLin Ling int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ 61*3f9d6ad7SLin Ling boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ 62*3f9d6ad7SLin Ling boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable srub prefetching */ 63*3f9d6ad7SLin Ling enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; 64*3f9d6ad7SLin Ling int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */ 65*3f9d6ad7SLin Ling 66*3f9d6ad7SLin Ling #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ 67*3f9d6ad7SLin Ling ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ 68*3f9d6ad7SLin Ling (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) 69*3f9d6ad7SLin Ling 70*3f9d6ad7SLin Ling extern int zfs_txg_timeout; 71*3f9d6ad7SLin Ling 72*3f9d6ad7SLin Ling /* the order has to match pool_scan_type */ 73*3f9d6ad7SLin Ling static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { 74*3f9d6ad7SLin Ling NULL, 75*3f9d6ad7SLin Ling dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ 76*3f9d6ad7SLin Ling dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ 77*3f9d6ad7SLin Ling }; 78*3f9d6ad7SLin Ling 79*3f9d6ad7SLin Ling int 80*3f9d6ad7SLin Ling dsl_scan_init(dsl_pool_t *dp, uint64_t txg) 81*3f9d6ad7SLin Ling { 82*3f9d6ad7SLin Ling int err; 83*3f9d6ad7SLin Ling dsl_scan_t *scn; 84*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 85*3f9d6ad7SLin Ling uint64_t f; 86*3f9d6ad7SLin Ling 87*3f9d6ad7SLin Ling scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); 88*3f9d6ad7SLin Ling scn->scn_dp = dp; 89*3f9d6ad7SLin Ling 90*3f9d6ad7SLin Ling err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 91*3f9d6ad7SLin Ling "scrub_func", sizeof (uint64_t), 1, &f); 92*3f9d6ad7SLin Ling if (err == 0) { 93*3f9d6ad7SLin Ling /* 94*3f9d6ad7SLin Ling * There was an old-style scrub in progress. Restart a 95*3f9d6ad7SLin Ling * new-style scrub from the beginning. 96*3f9d6ad7SLin Ling */ 97*3f9d6ad7SLin Ling scn->scn_restart_txg = txg; 98*3f9d6ad7SLin Ling zfs_dbgmsg("old-style scrub was in progress; " 99*3f9d6ad7SLin Ling "restarting new-style scrub in txg %llu", 100*3f9d6ad7SLin Ling scn->scn_restart_txg); 101*3f9d6ad7SLin Ling 102*3f9d6ad7SLin Ling /* 103*3f9d6ad7SLin Ling * Load the queue obj from the old location so that it 104*3f9d6ad7SLin Ling * can be freed by dsl_scan_done(). 105*3f9d6ad7SLin Ling */ 106*3f9d6ad7SLin Ling (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 107*3f9d6ad7SLin Ling "scrub_queue", sizeof (uint64_t), 1, 108*3f9d6ad7SLin Ling &scn->scn_phys.scn_queue_obj); 109*3f9d6ad7SLin Ling } else { 110*3f9d6ad7SLin Ling err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 111*3f9d6ad7SLin Ling DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, 112*3f9d6ad7SLin Ling &scn->scn_phys); 113*3f9d6ad7SLin Ling if (err == ENOENT) 114*3f9d6ad7SLin Ling return (0); 115*3f9d6ad7SLin Ling else if (err) 116*3f9d6ad7SLin Ling return (err); 117*3f9d6ad7SLin Ling 118*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state == DSS_SCANNING && 119*3f9d6ad7SLin Ling spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { 120*3f9d6ad7SLin Ling /* 121*3f9d6ad7SLin Ling * A new-type scrub was in progress on an old 122*3f9d6ad7SLin Ling * pool, and the pool was accessed by old 123*3f9d6ad7SLin Ling * software. Restart from the beginning, since 124*3f9d6ad7SLin Ling * the old software may have changed the pool in 125*3f9d6ad7SLin Ling * the meantime. 126*3f9d6ad7SLin Ling */ 127*3f9d6ad7SLin Ling scn->scn_restart_txg = txg; 128*3f9d6ad7SLin Ling zfs_dbgmsg("new-style scrub was modified " 129*3f9d6ad7SLin Ling "by old software; restarting in txg %llu", 130*3f9d6ad7SLin Ling scn->scn_restart_txg); 131*3f9d6ad7SLin Ling } 132*3f9d6ad7SLin Ling } 133*3f9d6ad7SLin Ling 134*3f9d6ad7SLin Ling spa_scan_stat_init(spa); 135*3f9d6ad7SLin Ling return (0); 136*3f9d6ad7SLin Ling } 137*3f9d6ad7SLin Ling 138*3f9d6ad7SLin Ling void 139*3f9d6ad7SLin Ling dsl_scan_fini(dsl_pool_t *dp) 140*3f9d6ad7SLin Ling { 141*3f9d6ad7SLin Ling if (dp->dp_scan) { 142*3f9d6ad7SLin Ling kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); 143*3f9d6ad7SLin Ling dp->dp_scan = NULL; 144*3f9d6ad7SLin Ling } 145*3f9d6ad7SLin Ling } 146*3f9d6ad7SLin Ling 147*3f9d6ad7SLin Ling /* ARGSUSED */ 148*3f9d6ad7SLin Ling static int 149*3f9d6ad7SLin Ling dsl_scan_setup_check(void *arg1, void *arg2, dmu_tx_t *tx) 150*3f9d6ad7SLin Ling { 151*3f9d6ad7SLin Ling dsl_scan_t *scn = arg1; 152*3f9d6ad7SLin Ling 153*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state == DSS_SCANNING) 154*3f9d6ad7SLin Ling return (EBUSY); 155*3f9d6ad7SLin Ling 156*3f9d6ad7SLin Ling return (0); 157*3f9d6ad7SLin Ling } 158*3f9d6ad7SLin Ling 159*3f9d6ad7SLin Ling /* ARGSUSED */ 160*3f9d6ad7SLin Ling static void 161*3f9d6ad7SLin Ling dsl_scan_setup_sync(void *arg1, void *arg2, dmu_tx_t *tx) 162*3f9d6ad7SLin Ling { 163*3f9d6ad7SLin Ling dsl_scan_t *scn = arg1; 164*3f9d6ad7SLin Ling pool_scan_func_t *funcp = arg2; 165*3f9d6ad7SLin Ling dmu_object_type_t ot = 0; 166*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 167*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 168*3f9d6ad7SLin Ling 169*3f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_state != DSS_SCANNING); 170*3f9d6ad7SLin Ling ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); 171*3f9d6ad7SLin Ling bzero(&scn->scn_phys, sizeof (scn->scn_phys)); 172*3f9d6ad7SLin Ling scn->scn_phys.scn_func = *funcp; 173*3f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_SCANNING; 174*3f9d6ad7SLin Ling scn->scn_phys.scn_min_txg = 0; 175*3f9d6ad7SLin Ling scn->scn_phys.scn_max_txg = tx->tx_txg; 176*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ 177*3f9d6ad7SLin Ling scn->scn_phys.scn_start_time = gethrestime_sec(); 178*3f9d6ad7SLin Ling scn->scn_phys.scn_errors = 0; 179*3f9d6ad7SLin Ling scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; 180*3f9d6ad7SLin Ling scn->scn_restart_txg = 0; 181*3f9d6ad7SLin Ling spa_scan_stat_init(spa); 182*3f9d6ad7SLin Ling 183*3f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 184*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; 185*3f9d6ad7SLin Ling 186*3f9d6ad7SLin Ling /* rewrite all disk labels */ 187*3f9d6ad7SLin Ling vdev_config_dirty(spa->spa_root_vdev); 188*3f9d6ad7SLin Ling 189*3f9d6ad7SLin Ling if (vdev_resilver_needed(spa->spa_root_vdev, 190*3f9d6ad7SLin Ling &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { 191*3f9d6ad7SLin Ling spa_event_notify(spa, NULL, ESC_ZFS_RESILVER_START); 192*3f9d6ad7SLin Ling } else { 193*3f9d6ad7SLin Ling spa_event_notify(spa, NULL, ESC_ZFS_SCRUB_START); 194*3f9d6ad7SLin Ling } 195*3f9d6ad7SLin Ling 196*3f9d6ad7SLin Ling spa->spa_scrub_started = B_TRUE; 197*3f9d6ad7SLin Ling /* 198*3f9d6ad7SLin Ling * If this is an incremental scrub, limit the DDT scrub phase 199*3f9d6ad7SLin Ling * to just the auto-ditto class (for correctness); the rest 200*3f9d6ad7SLin Ling * of the scrub should go faster using top-down pruning. 201*3f9d6ad7SLin Ling */ 202*3f9d6ad7SLin Ling if (scn->scn_phys.scn_min_txg > TXG_INITIAL) 203*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; 204*3f9d6ad7SLin Ling 205*3f9d6ad7SLin Ling } 206*3f9d6ad7SLin Ling 207*3f9d6ad7SLin Ling /* back to the generic stuff */ 208*3f9d6ad7SLin Ling 209*3f9d6ad7SLin Ling if (dp->dp_blkstats == NULL) { 210*3f9d6ad7SLin Ling dp->dp_blkstats = 211*3f9d6ad7SLin Ling kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); 212*3f9d6ad7SLin Ling } 213*3f9d6ad7SLin Ling bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); 214*3f9d6ad7SLin Ling 215*3f9d6ad7SLin Ling if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) 216*3f9d6ad7SLin Ling ot = DMU_OT_ZAP_OTHER; 217*3f9d6ad7SLin Ling 218*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, 219*3f9d6ad7SLin Ling ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); 220*3f9d6ad7SLin Ling 221*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 222*3f9d6ad7SLin Ling 223*3f9d6ad7SLin Ling spa_history_log_internal(LOG_POOL_SCAN, spa, tx, 224*3f9d6ad7SLin Ling "func=%u mintxg=%llu maxtxg=%llu", 225*3f9d6ad7SLin Ling *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg); 226*3f9d6ad7SLin Ling } 227*3f9d6ad7SLin Ling 228*3f9d6ad7SLin Ling /* ARGSUSED */ 229*3f9d6ad7SLin Ling static void 230*3f9d6ad7SLin Ling dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) 231*3f9d6ad7SLin Ling { 232*3f9d6ad7SLin Ling static const char *old_names[] = { 233*3f9d6ad7SLin Ling "scrub_bookmark", 234*3f9d6ad7SLin Ling "scrub_ddt_bookmark", 235*3f9d6ad7SLin Ling "scrub_ddt_class_max", 236*3f9d6ad7SLin Ling "scrub_queue", 237*3f9d6ad7SLin Ling "scrub_min_txg", 238*3f9d6ad7SLin Ling "scrub_max_txg", 239*3f9d6ad7SLin Ling "scrub_func", 240*3f9d6ad7SLin Ling "scrub_errors", 241*3f9d6ad7SLin Ling NULL 242*3f9d6ad7SLin Ling }; 243*3f9d6ad7SLin Ling 244*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 245*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 246*3f9d6ad7SLin Ling int i; 247*3f9d6ad7SLin Ling 248*3f9d6ad7SLin Ling /* Remove any remnants of an old-style scrub. */ 249*3f9d6ad7SLin Ling for (i = 0; old_names[i]; i++) { 250*3f9d6ad7SLin Ling (void) zap_remove(dp->dp_meta_objset, 251*3f9d6ad7SLin Ling DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); 252*3f9d6ad7SLin Ling } 253*3f9d6ad7SLin Ling 254*3f9d6ad7SLin Ling if (scn->scn_phys.scn_queue_obj != 0) { 255*3f9d6ad7SLin Ling VERIFY(0 == dmu_object_free(dp->dp_meta_objset, 256*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, tx)); 257*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj = 0; 258*3f9d6ad7SLin Ling } 259*3f9d6ad7SLin Ling 260*3f9d6ad7SLin Ling /* 261*3f9d6ad7SLin Ling * If we were "restarted" from a stopped state, don't bother 262*3f9d6ad7SLin Ling * with anything else. 263*3f9d6ad7SLin Ling */ 264*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 265*3f9d6ad7SLin Ling return; 266*3f9d6ad7SLin Ling 267*3f9d6ad7SLin Ling if (complete) 268*3f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_FINISHED; 269*3f9d6ad7SLin Ling else 270*3f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_CANCELED; 271*3f9d6ad7SLin Ling 272*3f9d6ad7SLin Ling spa_history_log_internal(LOG_POOL_SCAN_DONE, spa, tx, 273*3f9d6ad7SLin Ling "complete=%u", complete); 274*3f9d6ad7SLin Ling 275*3f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 276*3f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 277*3f9d6ad7SLin Ling while (spa->spa_scrub_inflight > 0) { 278*3f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, 279*3f9d6ad7SLin Ling &spa->spa_scrub_lock); 280*3f9d6ad7SLin Ling } 281*3f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 282*3f9d6ad7SLin Ling spa->spa_scrub_started = B_FALSE; 283*3f9d6ad7SLin Ling spa->spa_scrub_active = B_FALSE; 284*3f9d6ad7SLin Ling 285*3f9d6ad7SLin Ling /* 286*3f9d6ad7SLin Ling * If the scrub/resilver completed, update all DTLs to 287*3f9d6ad7SLin Ling * reflect this. Whether it succeeded or not, vacate 288*3f9d6ad7SLin Ling * all temporary scrub DTLs. 289*3f9d6ad7SLin Ling */ 290*3f9d6ad7SLin Ling vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, 291*3f9d6ad7SLin Ling complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE); 292*3f9d6ad7SLin Ling if (complete) { 293*3f9d6ad7SLin Ling spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ? 294*3f9d6ad7SLin Ling ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH); 295*3f9d6ad7SLin Ling } 296*3f9d6ad7SLin Ling spa_errlog_rotate(spa); 297*3f9d6ad7SLin Ling 298*3f9d6ad7SLin Ling /* 299*3f9d6ad7SLin Ling * We may have finished replacing a device. 300*3f9d6ad7SLin Ling * Let the async thread assess this and handle the detach. 301*3f9d6ad7SLin Ling */ 302*3f9d6ad7SLin Ling spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 303*3f9d6ad7SLin Ling } 304*3f9d6ad7SLin Ling 305*3f9d6ad7SLin Ling scn->scn_phys.scn_end_time = gethrestime_sec(); 306*3f9d6ad7SLin Ling } 307*3f9d6ad7SLin Ling 308*3f9d6ad7SLin Ling /* ARGSUSED */ 309*3f9d6ad7SLin Ling static int 310*3f9d6ad7SLin Ling dsl_scan_cancel_check(void *arg1, void *arg2, dmu_tx_t *tx) 311*3f9d6ad7SLin Ling { 312*3f9d6ad7SLin Ling dsl_scan_t *scn = arg1; 313*3f9d6ad7SLin Ling 314*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 315*3f9d6ad7SLin Ling return (ENOENT); 316*3f9d6ad7SLin Ling return (0); 317*3f9d6ad7SLin Ling } 318*3f9d6ad7SLin Ling 319*3f9d6ad7SLin Ling /* ARGSUSED */ 320*3f9d6ad7SLin Ling static void 321*3f9d6ad7SLin Ling dsl_scan_cancel_sync(void *arg1, void *arg2, dmu_tx_t *tx) 322*3f9d6ad7SLin Ling { 323*3f9d6ad7SLin Ling dsl_scan_t *scn = arg1; 324*3f9d6ad7SLin Ling 325*3f9d6ad7SLin Ling dsl_scan_done(scn, B_FALSE, tx); 326*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 327*3f9d6ad7SLin Ling } 328*3f9d6ad7SLin Ling 329*3f9d6ad7SLin Ling int 330*3f9d6ad7SLin Ling dsl_scan_cancel(dsl_pool_t *dp) 331*3f9d6ad7SLin Ling { 332*3f9d6ad7SLin Ling boolean_t complete = B_FALSE; 333*3f9d6ad7SLin Ling int err; 334*3f9d6ad7SLin Ling 335*3f9d6ad7SLin Ling err = dsl_sync_task_do(dp, dsl_scan_cancel_check, 336*3f9d6ad7SLin Ling dsl_scan_cancel_sync, dp->dp_scan, &complete, 3); 337*3f9d6ad7SLin Ling return (err); 338*3f9d6ad7SLin Ling } 339*3f9d6ad7SLin Ling 340*3f9d6ad7SLin Ling static void dsl_scan_visitbp(blkptr_t *bp, 341*3f9d6ad7SLin Ling const zbookmark_t *zb, dnode_phys_t *dnp, arc_buf_t *pbuf, 342*3f9d6ad7SLin Ling dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, 343*3f9d6ad7SLin Ling dmu_tx_t *tx); 344*3f9d6ad7SLin Ling static void dsl_scan_visitdnode(dsl_scan_t *, dsl_dataset_t *ds, 345*3f9d6ad7SLin Ling dmu_objset_type_t ostype, 346*3f9d6ad7SLin Ling dnode_phys_t *dnp, arc_buf_t *buf, uint64_t object, dmu_tx_t *tx); 347*3f9d6ad7SLin Ling 348*3f9d6ad7SLin Ling void 349*3f9d6ad7SLin Ling dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) 350*3f9d6ad7SLin Ling { 351*3f9d6ad7SLin Ling zio_free(dp->dp_spa, txg, bp); 352*3f9d6ad7SLin Ling } 353*3f9d6ad7SLin Ling 354*3f9d6ad7SLin Ling void 355*3f9d6ad7SLin Ling dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) 356*3f9d6ad7SLin Ling { 357*3f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dp)); 358*3f9d6ad7SLin Ling zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); 359*3f9d6ad7SLin Ling } 360*3f9d6ad7SLin Ling 361*3f9d6ad7SLin Ling int 362*3f9d6ad7SLin Ling dsl_read(zio_t *pio, spa_t *spa, const blkptr_t *bpp, arc_buf_t *pbuf, 363*3f9d6ad7SLin Ling arc_done_func_t *done, void *private, int priority, int zio_flags, 364*3f9d6ad7SLin Ling uint32_t *arc_flags, const zbookmark_t *zb) 365*3f9d6ad7SLin Ling { 366*3f9d6ad7SLin Ling return (arc_read(pio, spa, bpp, pbuf, done, private, 367*3f9d6ad7SLin Ling priority, zio_flags, arc_flags, zb)); 368*3f9d6ad7SLin Ling } 369*3f9d6ad7SLin Ling 370*3f9d6ad7SLin Ling int 371*3f9d6ad7SLin Ling dsl_read_nolock(zio_t *pio, spa_t *spa, const blkptr_t *bpp, 372*3f9d6ad7SLin Ling arc_done_func_t *done, void *private, int priority, int zio_flags, 373*3f9d6ad7SLin Ling uint32_t *arc_flags, const zbookmark_t *zb) 374*3f9d6ad7SLin Ling { 375*3f9d6ad7SLin Ling return (arc_read_nolock(pio, spa, bpp, done, private, 376*3f9d6ad7SLin Ling priority, zio_flags, arc_flags, zb)); 377*3f9d6ad7SLin Ling } 378*3f9d6ad7SLin Ling 379*3f9d6ad7SLin Ling static boolean_t 380*3f9d6ad7SLin Ling bookmark_is_zero(const zbookmark_t *zb) 381*3f9d6ad7SLin Ling { 382*3f9d6ad7SLin Ling return (zb->zb_objset == 0 && zb->zb_object == 0 && 383*3f9d6ad7SLin Ling zb->zb_level == 0 && zb->zb_blkid == 0); 384*3f9d6ad7SLin Ling } 385*3f9d6ad7SLin Ling 386*3f9d6ad7SLin Ling /* dnp is the dnode for zb1->zb_object */ 387*3f9d6ad7SLin Ling static boolean_t 388*3f9d6ad7SLin Ling bookmark_is_before(const dnode_phys_t *dnp, const zbookmark_t *zb1, 389*3f9d6ad7SLin Ling const zbookmark_t *zb2) 390*3f9d6ad7SLin Ling { 391*3f9d6ad7SLin Ling uint64_t zb1nextL0, zb2thisobj; 392*3f9d6ad7SLin Ling 393*3f9d6ad7SLin Ling ASSERT(zb1->zb_objset == zb2->zb_objset); 394*3f9d6ad7SLin Ling ASSERT(zb2->zb_level == 0); 395*3f9d6ad7SLin Ling 396*3f9d6ad7SLin Ling /* 397*3f9d6ad7SLin Ling * A bookmark in the deadlist is considered to be after 398*3f9d6ad7SLin Ling * everything else. 399*3f9d6ad7SLin Ling */ 400*3f9d6ad7SLin Ling if (zb2->zb_object == DMU_DEADLIST_OBJECT) 401*3f9d6ad7SLin Ling return (B_TRUE); 402*3f9d6ad7SLin Ling 403*3f9d6ad7SLin Ling /* The objset_phys_t isn't before anything. */ 404*3f9d6ad7SLin Ling if (dnp == NULL) 405*3f9d6ad7SLin Ling return (B_FALSE); 406*3f9d6ad7SLin Ling 407*3f9d6ad7SLin Ling zb1nextL0 = (zb1->zb_blkid + 1) << 408*3f9d6ad7SLin Ling ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); 409*3f9d6ad7SLin Ling 410*3f9d6ad7SLin Ling zb2thisobj = zb2->zb_object ? zb2->zb_object : 411*3f9d6ad7SLin Ling zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); 412*3f9d6ad7SLin Ling 413*3f9d6ad7SLin Ling if (zb1->zb_object == DMU_META_DNODE_OBJECT) { 414*3f9d6ad7SLin Ling uint64_t nextobj = zb1nextL0 * 415*3f9d6ad7SLin Ling (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; 416*3f9d6ad7SLin Ling return (nextobj <= zb2thisobj); 417*3f9d6ad7SLin Ling } 418*3f9d6ad7SLin Ling 419*3f9d6ad7SLin Ling if (zb1->zb_object < zb2thisobj) 420*3f9d6ad7SLin Ling return (B_TRUE); 421*3f9d6ad7SLin Ling if (zb1->zb_object > zb2thisobj) 422*3f9d6ad7SLin Ling return (B_FALSE); 423*3f9d6ad7SLin Ling if (zb2->zb_object == DMU_META_DNODE_OBJECT) 424*3f9d6ad7SLin Ling return (B_FALSE); 425*3f9d6ad7SLin Ling return (zb1nextL0 <= zb2->zb_blkid); 426*3f9d6ad7SLin Ling } 427*3f9d6ad7SLin Ling 428*3f9d6ad7SLin Ling static uint64_t 429*3f9d6ad7SLin Ling dsl_scan_ds_maxtxg(dsl_dataset_t *ds) 430*3f9d6ad7SLin Ling { 431*3f9d6ad7SLin Ling uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; 432*3f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) 433*3f9d6ad7SLin Ling return (MIN(smt, ds->ds_phys->ds_creation_txg)); 434*3f9d6ad7SLin Ling return (smt); 435*3f9d6ad7SLin Ling } 436*3f9d6ad7SLin Ling 437*3f9d6ad7SLin Ling static void 438*3f9d6ad7SLin Ling dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) 439*3f9d6ad7SLin Ling { 440*3f9d6ad7SLin Ling VERIFY(0 == zap_update(scn->scn_dp->dp_meta_objset, 441*3f9d6ad7SLin Ling DMU_POOL_DIRECTORY_OBJECT, 442*3f9d6ad7SLin Ling DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, 443*3f9d6ad7SLin Ling &scn->scn_phys, tx)); 444*3f9d6ad7SLin Ling } 445*3f9d6ad7SLin Ling 446*3f9d6ad7SLin Ling static boolean_t 447*3f9d6ad7SLin Ling dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_t *zb) 448*3f9d6ad7SLin Ling { 449*3f9d6ad7SLin Ling uint64_t elapsed_nanosecs; 450*3f9d6ad7SLin Ling int mintime; 451*3f9d6ad7SLin Ling 452*3f9d6ad7SLin Ling /* we never skip user/group accounting objects */ 453*3f9d6ad7SLin Ling if (zb && (int64_t)zb->zb_object < 0) 454*3f9d6ad7SLin Ling return (B_FALSE); 455*3f9d6ad7SLin Ling 456*3f9d6ad7SLin Ling if (scn->scn_pausing) 457*3f9d6ad7SLin Ling return (B_TRUE); /* we're already pausing */ 458*3f9d6ad7SLin Ling 459*3f9d6ad7SLin Ling if (!bookmark_is_zero(&scn->scn_phys.scn_bookmark)) 460*3f9d6ad7SLin Ling return (B_FALSE); /* we're resuming */ 461*3f9d6ad7SLin Ling 462*3f9d6ad7SLin Ling /* We only know how to resume from level-0 blocks. */ 463*3f9d6ad7SLin Ling if (zb && zb->zb_level != 0) 464*3f9d6ad7SLin Ling return (B_FALSE); 465*3f9d6ad7SLin Ling 466*3f9d6ad7SLin Ling mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? 467*3f9d6ad7SLin Ling zfs_resilver_min_time_ms : zfs_scan_min_time_ms; 468*3f9d6ad7SLin Ling elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; 469*3f9d6ad7SLin Ling if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || 470*3f9d6ad7SLin Ling (elapsed_nanosecs / MICROSEC > mintime && 471*3f9d6ad7SLin Ling txg_sync_waiting(scn->scn_dp)) || 472*3f9d6ad7SLin Ling spa_shutting_down(scn->scn_dp->dp_spa)) { 473*3f9d6ad7SLin Ling if (zb) { 474*3f9d6ad7SLin Ling dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", 475*3f9d6ad7SLin Ling (longlong_t)zb->zb_objset, 476*3f9d6ad7SLin Ling (longlong_t)zb->zb_object, 477*3f9d6ad7SLin Ling (longlong_t)zb->zb_level, 478*3f9d6ad7SLin Ling (longlong_t)zb->zb_blkid); 479*3f9d6ad7SLin Ling scn->scn_phys.scn_bookmark = *zb; 480*3f9d6ad7SLin Ling } 481*3f9d6ad7SLin Ling dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n", 482*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, 483*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, 484*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, 485*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); 486*3f9d6ad7SLin Ling scn->scn_pausing = B_TRUE; 487*3f9d6ad7SLin Ling return (B_TRUE); 488*3f9d6ad7SLin Ling } 489*3f9d6ad7SLin Ling return (B_FALSE); 490*3f9d6ad7SLin Ling } 491*3f9d6ad7SLin Ling 492*3f9d6ad7SLin Ling typedef struct zil_scan_arg { 493*3f9d6ad7SLin Ling dsl_pool_t *zsa_dp; 494*3f9d6ad7SLin Ling zil_header_t *zsa_zh; 495*3f9d6ad7SLin Ling } zil_scan_arg_t; 496*3f9d6ad7SLin Ling 497*3f9d6ad7SLin Ling /* ARGSUSED */ 498*3f9d6ad7SLin Ling static int 499*3f9d6ad7SLin Ling dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 500*3f9d6ad7SLin Ling { 501*3f9d6ad7SLin Ling zil_scan_arg_t *zsa = arg; 502*3f9d6ad7SLin Ling dsl_pool_t *dp = zsa->zsa_dp; 503*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 504*3f9d6ad7SLin Ling zil_header_t *zh = zsa->zsa_zh; 505*3f9d6ad7SLin Ling zbookmark_t zb; 506*3f9d6ad7SLin Ling 507*3f9d6ad7SLin Ling if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 508*3f9d6ad7SLin Ling return (0); 509*3f9d6ad7SLin Ling 510*3f9d6ad7SLin Ling /* 511*3f9d6ad7SLin Ling * One block ("stubby") can be allocated a long time ago; we 512*3f9d6ad7SLin Ling * want to visit that one because it has been allocated 513*3f9d6ad7SLin Ling * (on-disk) even if it hasn't been claimed (even though for 514*3f9d6ad7SLin Ling * scrub there's nothing to do to it). 515*3f9d6ad7SLin Ling */ 516*3f9d6ad7SLin Ling if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) 517*3f9d6ad7SLin Ling return (0); 518*3f9d6ad7SLin Ling 519*3f9d6ad7SLin Ling SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], 520*3f9d6ad7SLin Ling ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 521*3f9d6ad7SLin Ling 522*3f9d6ad7SLin Ling VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); 523*3f9d6ad7SLin Ling return (0); 524*3f9d6ad7SLin Ling } 525*3f9d6ad7SLin Ling 526*3f9d6ad7SLin Ling /* ARGSUSED */ 527*3f9d6ad7SLin Ling static int 528*3f9d6ad7SLin Ling dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 529*3f9d6ad7SLin Ling { 530*3f9d6ad7SLin Ling if (lrc->lrc_txtype == TX_WRITE) { 531*3f9d6ad7SLin Ling zil_scan_arg_t *zsa = arg; 532*3f9d6ad7SLin Ling dsl_pool_t *dp = zsa->zsa_dp; 533*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 534*3f9d6ad7SLin Ling zil_header_t *zh = zsa->zsa_zh; 535*3f9d6ad7SLin Ling lr_write_t *lr = (lr_write_t *)lrc; 536*3f9d6ad7SLin Ling blkptr_t *bp = &lr->lr_blkptr; 537*3f9d6ad7SLin Ling zbookmark_t zb; 538*3f9d6ad7SLin Ling 539*3f9d6ad7SLin Ling if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 540*3f9d6ad7SLin Ling return (0); 541*3f9d6ad7SLin Ling 542*3f9d6ad7SLin Ling /* 543*3f9d6ad7SLin Ling * birth can be < claim_txg if this record's txg is 544*3f9d6ad7SLin Ling * already txg sync'ed (but this log block contains 545*3f9d6ad7SLin Ling * other records that are not synced) 546*3f9d6ad7SLin Ling */ 547*3f9d6ad7SLin Ling if (claim_txg == 0 || bp->blk_birth < claim_txg) 548*3f9d6ad7SLin Ling return (0); 549*3f9d6ad7SLin Ling 550*3f9d6ad7SLin Ling SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], 551*3f9d6ad7SLin Ling lr->lr_foid, ZB_ZIL_LEVEL, 552*3f9d6ad7SLin Ling lr->lr_offset / BP_GET_LSIZE(bp)); 553*3f9d6ad7SLin Ling 554*3f9d6ad7SLin Ling VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); 555*3f9d6ad7SLin Ling } 556*3f9d6ad7SLin Ling return (0); 557*3f9d6ad7SLin Ling } 558*3f9d6ad7SLin Ling 559*3f9d6ad7SLin Ling static void 560*3f9d6ad7SLin Ling dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) 561*3f9d6ad7SLin Ling { 562*3f9d6ad7SLin Ling uint64_t claim_txg = zh->zh_claim_txg; 563*3f9d6ad7SLin Ling zil_scan_arg_t zsa = { dp, zh }; 564*3f9d6ad7SLin Ling zilog_t *zilog; 565*3f9d6ad7SLin Ling 566*3f9d6ad7SLin Ling /* 567*3f9d6ad7SLin Ling * We only want to visit blocks that have been claimed but not yet 568*3f9d6ad7SLin Ling * replayed (or, in read-only mode, blocks that *would* be claimed). 569*3f9d6ad7SLin Ling */ 570*3f9d6ad7SLin Ling if (claim_txg == 0 && spa_writeable(dp->dp_spa)) 571*3f9d6ad7SLin Ling return; 572*3f9d6ad7SLin Ling 573*3f9d6ad7SLin Ling zilog = zil_alloc(dp->dp_meta_objset, zh); 574*3f9d6ad7SLin Ling 575*3f9d6ad7SLin Ling (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, 576*3f9d6ad7SLin Ling claim_txg); 577*3f9d6ad7SLin Ling 578*3f9d6ad7SLin Ling zil_free(zilog); 579*3f9d6ad7SLin Ling } 580*3f9d6ad7SLin Ling 581*3f9d6ad7SLin Ling /* ARGSUSED */ 582*3f9d6ad7SLin Ling static void 583*3f9d6ad7SLin Ling dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp, 584*3f9d6ad7SLin Ling uint64_t objset, uint64_t object, uint64_t blkid) 585*3f9d6ad7SLin Ling { 586*3f9d6ad7SLin Ling zbookmark_t czb; 587*3f9d6ad7SLin Ling uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; 588*3f9d6ad7SLin Ling 589*3f9d6ad7SLin Ling if (zfs_no_scrub_prefetch) 590*3f9d6ad7SLin Ling return; 591*3f9d6ad7SLin Ling 592*3f9d6ad7SLin Ling if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg || 593*3f9d6ad7SLin Ling (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)) 594*3f9d6ad7SLin Ling return; 595*3f9d6ad7SLin Ling 596*3f9d6ad7SLin Ling SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid); 597*3f9d6ad7SLin Ling 598*3f9d6ad7SLin Ling /* 599*3f9d6ad7SLin Ling * XXX need to make sure all of these arc_read() prefetches are 600*3f9d6ad7SLin Ling * done before setting xlateall (similar to dsl_read()) 601*3f9d6ad7SLin Ling */ 602*3f9d6ad7SLin Ling (void) arc_read(scn->scn_prefetch_zio_root, scn->scn_dp->dp_spa, bp, 603*3f9d6ad7SLin Ling buf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 604*3f9d6ad7SLin Ling &flags, &czb); 605*3f9d6ad7SLin Ling } 606*3f9d6ad7SLin Ling 607*3f9d6ad7SLin Ling static boolean_t 608*3f9d6ad7SLin Ling dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, 609*3f9d6ad7SLin Ling const zbookmark_t *zb) 610*3f9d6ad7SLin Ling { 611*3f9d6ad7SLin Ling /* 612*3f9d6ad7SLin Ling * We never skip over user/group accounting objects (obj<0) 613*3f9d6ad7SLin Ling */ 614*3f9d6ad7SLin Ling if (!bookmark_is_zero(&scn->scn_phys.scn_bookmark) && 615*3f9d6ad7SLin Ling (int64_t)zb->zb_object >= 0) { 616*3f9d6ad7SLin Ling /* 617*3f9d6ad7SLin Ling * If we already visited this bp & everything below (in 618*3f9d6ad7SLin Ling * a prior txg sync), don't bother doing it again. 619*3f9d6ad7SLin Ling */ 620*3f9d6ad7SLin Ling if (bookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark)) 621*3f9d6ad7SLin Ling return (B_TRUE); 622*3f9d6ad7SLin Ling 623*3f9d6ad7SLin Ling /* 624*3f9d6ad7SLin Ling * If we found the block we're trying to resume from, or 625*3f9d6ad7SLin Ling * we went past it to a different object, zero it out to 626*3f9d6ad7SLin Ling * indicate that it's OK to start checking for pausing 627*3f9d6ad7SLin Ling * again. 628*3f9d6ad7SLin Ling */ 629*3f9d6ad7SLin Ling if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || 630*3f9d6ad7SLin Ling zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { 631*3f9d6ad7SLin Ling dprintf("resuming at %llx/%llx/%llx/%llx\n", 632*3f9d6ad7SLin Ling (longlong_t)zb->zb_objset, 633*3f9d6ad7SLin Ling (longlong_t)zb->zb_object, 634*3f9d6ad7SLin Ling (longlong_t)zb->zb_level, 635*3f9d6ad7SLin Ling (longlong_t)zb->zb_blkid); 636*3f9d6ad7SLin Ling bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); 637*3f9d6ad7SLin Ling } 638*3f9d6ad7SLin Ling } 639*3f9d6ad7SLin Ling return (B_FALSE); 640*3f9d6ad7SLin Ling } 641*3f9d6ad7SLin Ling 642*3f9d6ad7SLin Ling /* 643*3f9d6ad7SLin Ling * Return nonzero on i/o error. 644*3f9d6ad7SLin Ling * Return new buf to write out in *bufp. 645*3f9d6ad7SLin Ling */ 646*3f9d6ad7SLin Ling static int 647*3f9d6ad7SLin Ling dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, 648*3f9d6ad7SLin Ling dnode_phys_t *dnp, const blkptr_t *bp, 649*3f9d6ad7SLin Ling const zbookmark_t *zb, dmu_tx_t *tx, arc_buf_t **bufp) 650*3f9d6ad7SLin Ling { 651*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 652*3f9d6ad7SLin Ling int err; 653*3f9d6ad7SLin Ling 654*3f9d6ad7SLin Ling if (BP_GET_LEVEL(bp) > 0) { 655*3f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 656*3f9d6ad7SLin Ling int i; 657*3f9d6ad7SLin Ling blkptr_t *cbp; 658*3f9d6ad7SLin Ling int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 659*3f9d6ad7SLin Ling 660*3f9d6ad7SLin Ling err = arc_read_nolock(NULL, dp->dp_spa, bp, 661*3f9d6ad7SLin Ling arc_getbuf_func, bufp, 662*3f9d6ad7SLin Ling ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 663*3f9d6ad7SLin Ling if (err) { 664*3f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 665*3f9d6ad7SLin Ling return (err); 666*3f9d6ad7SLin Ling } 667*3f9d6ad7SLin Ling for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { 668*3f9d6ad7SLin Ling dsl_scan_prefetch(scn, *bufp, cbp, zb->zb_objset, 669*3f9d6ad7SLin Ling zb->zb_object, zb->zb_blkid * epb + i); 670*3f9d6ad7SLin Ling } 671*3f9d6ad7SLin Ling for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { 672*3f9d6ad7SLin Ling zbookmark_t czb; 673*3f9d6ad7SLin Ling 674*3f9d6ad7SLin Ling SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 675*3f9d6ad7SLin Ling zb->zb_level - 1, 676*3f9d6ad7SLin Ling zb->zb_blkid * epb + i); 677*3f9d6ad7SLin Ling dsl_scan_visitbp(cbp, &czb, dnp, 678*3f9d6ad7SLin Ling *bufp, ds, scn, ostype, tx); 679*3f9d6ad7SLin Ling } 680*3f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_USERGROUP_USED) { 681*3f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 682*3f9d6ad7SLin Ling 683*3f9d6ad7SLin Ling err = arc_read_nolock(NULL, dp->dp_spa, bp, 684*3f9d6ad7SLin Ling arc_getbuf_func, bufp, 685*3f9d6ad7SLin Ling ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 686*3f9d6ad7SLin Ling if (err) { 687*3f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 688*3f9d6ad7SLin Ling return (err); 689*3f9d6ad7SLin Ling } 690*3f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 691*3f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 692*3f9d6ad7SLin Ling dnode_phys_t *cdnp; 693*3f9d6ad7SLin Ling int i, j; 694*3f9d6ad7SLin Ling int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 695*3f9d6ad7SLin Ling 696*3f9d6ad7SLin Ling err = arc_read_nolock(NULL, dp->dp_spa, bp, 697*3f9d6ad7SLin Ling arc_getbuf_func, bufp, 698*3f9d6ad7SLin Ling ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 699*3f9d6ad7SLin Ling if (err) { 700*3f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 701*3f9d6ad7SLin Ling return (err); 702*3f9d6ad7SLin Ling } 703*3f9d6ad7SLin Ling for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { 704*3f9d6ad7SLin Ling for (j = 0; j < cdnp->dn_nblkptr; j++) { 705*3f9d6ad7SLin Ling blkptr_t *cbp = &cdnp->dn_blkptr[j]; 706*3f9d6ad7SLin Ling dsl_scan_prefetch(scn, *bufp, cbp, 707*3f9d6ad7SLin Ling zb->zb_objset, zb->zb_blkid * epb + i, j); 708*3f9d6ad7SLin Ling } 709*3f9d6ad7SLin Ling } 710*3f9d6ad7SLin Ling for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { 711*3f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, ostype, 712*3f9d6ad7SLin Ling cdnp, *bufp, zb->zb_blkid * epb + i, tx); 713*3f9d6ad7SLin Ling } 714*3f9d6ad7SLin Ling 715*3f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 716*3f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 717*3f9d6ad7SLin Ling objset_phys_t *osp; 718*3f9d6ad7SLin Ling 719*3f9d6ad7SLin Ling err = arc_read_nolock(NULL, dp->dp_spa, bp, 720*3f9d6ad7SLin Ling arc_getbuf_func, bufp, 721*3f9d6ad7SLin Ling ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); 722*3f9d6ad7SLin Ling if (err) { 723*3f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 724*3f9d6ad7SLin Ling return (err); 725*3f9d6ad7SLin Ling } 726*3f9d6ad7SLin Ling 727*3f9d6ad7SLin Ling osp = (*bufp)->b_data; 728*3f9d6ad7SLin Ling 729*3f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) 730*3f9d6ad7SLin Ling dsl_scan_zil(dp, &osp->os_zil_header); 731*3f9d6ad7SLin Ling 732*3f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 733*3f9d6ad7SLin Ling &osp->os_meta_dnode, *bufp, DMU_META_DNODE_OBJECT, tx); 734*3f9d6ad7SLin Ling 735*3f9d6ad7SLin Ling if (OBJSET_BUF_HAS_USERUSED(*bufp)) { 736*3f9d6ad7SLin Ling /* 737*3f9d6ad7SLin Ling * We also always visit user/group accounting 738*3f9d6ad7SLin Ling * objects, and never skip them, even if we are 739*3f9d6ad7SLin Ling * pausing. This is necessary so that the space 740*3f9d6ad7SLin Ling * deltas from this txg get integrated. 741*3f9d6ad7SLin Ling */ 742*3f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 743*3f9d6ad7SLin Ling &osp->os_groupused_dnode, *bufp, 744*3f9d6ad7SLin Ling DMU_GROUPUSED_OBJECT, tx); 745*3f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 746*3f9d6ad7SLin Ling &osp->os_userused_dnode, *bufp, 747*3f9d6ad7SLin Ling DMU_USERUSED_OBJECT, tx); 748*3f9d6ad7SLin Ling } 749*3f9d6ad7SLin Ling } 750*3f9d6ad7SLin Ling 751*3f9d6ad7SLin Ling return (0); 752*3f9d6ad7SLin Ling } 753*3f9d6ad7SLin Ling 754*3f9d6ad7SLin Ling static void 755*3f9d6ad7SLin Ling dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, 756*3f9d6ad7SLin Ling dmu_objset_type_t ostype, dnode_phys_t *dnp, arc_buf_t *buf, 757*3f9d6ad7SLin Ling uint64_t object, dmu_tx_t *tx) 758*3f9d6ad7SLin Ling { 759*3f9d6ad7SLin Ling int j; 760*3f9d6ad7SLin Ling 761*3f9d6ad7SLin Ling for (j = 0; j < dnp->dn_nblkptr; j++) { 762*3f9d6ad7SLin Ling zbookmark_t czb; 763*3f9d6ad7SLin Ling 764*3f9d6ad7SLin Ling SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, 765*3f9d6ad7SLin Ling dnp->dn_nlevels - 1, j); 766*3f9d6ad7SLin Ling dsl_scan_visitbp(&dnp->dn_blkptr[j], 767*3f9d6ad7SLin Ling &czb, dnp, buf, ds, scn, ostype, tx); 768*3f9d6ad7SLin Ling } 769*3f9d6ad7SLin Ling 770*3f9d6ad7SLin Ling if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 771*3f9d6ad7SLin Ling zbookmark_t czb; 772*3f9d6ad7SLin Ling SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, 773*3f9d6ad7SLin Ling 0, DMU_SPILL_BLKID); 774*3f9d6ad7SLin Ling dsl_scan_visitbp(&dnp->dn_spill, 775*3f9d6ad7SLin Ling &czb, dnp, buf, ds, scn, ostype, tx); 776*3f9d6ad7SLin Ling } 777*3f9d6ad7SLin Ling } 778*3f9d6ad7SLin Ling 779*3f9d6ad7SLin Ling /* 780*3f9d6ad7SLin Ling * The arguments are in this order because mdb can only print the 781*3f9d6ad7SLin Ling * first 5; we want them to be useful. 782*3f9d6ad7SLin Ling */ 783*3f9d6ad7SLin Ling static void 784*3f9d6ad7SLin Ling dsl_scan_visitbp(blkptr_t *bp, const zbookmark_t *zb, 785*3f9d6ad7SLin Ling dnode_phys_t *dnp, arc_buf_t *pbuf, 786*3f9d6ad7SLin Ling dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, 787*3f9d6ad7SLin Ling dmu_tx_t *tx) 788*3f9d6ad7SLin Ling { 789*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 790*3f9d6ad7SLin Ling arc_buf_t *buf = NULL; 791*3f9d6ad7SLin Ling blkptr_t bp_toread = *bp; 792*3f9d6ad7SLin Ling 793*3f9d6ad7SLin Ling /* ASSERT(pbuf == NULL || arc_released(pbuf)); */ 794*3f9d6ad7SLin Ling 795*3f9d6ad7SLin Ling if (dsl_scan_check_pause(scn, zb)) 796*3f9d6ad7SLin Ling return; 797*3f9d6ad7SLin Ling 798*3f9d6ad7SLin Ling if (dsl_scan_check_resume(scn, dnp, zb)) 799*3f9d6ad7SLin Ling return; 800*3f9d6ad7SLin Ling 801*3f9d6ad7SLin Ling if (bp->blk_birth == 0) 802*3f9d6ad7SLin Ling return; 803*3f9d6ad7SLin Ling 804*3f9d6ad7SLin Ling scn->scn_visited_this_txg++; 805*3f9d6ad7SLin Ling 806*3f9d6ad7SLin Ling dprintf_bp(bp, 807*3f9d6ad7SLin Ling "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p", 808*3f9d6ad7SLin Ling ds, ds ? ds->ds_object : 0, 809*3f9d6ad7SLin Ling zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, 810*3f9d6ad7SLin Ling pbuf, bp); 811*3f9d6ad7SLin Ling 812*3f9d6ad7SLin Ling if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 813*3f9d6ad7SLin Ling return; 814*3f9d6ad7SLin Ling 815*3f9d6ad7SLin Ling if (BP_GET_TYPE(bp) != DMU_OT_USERGROUP_USED) { 816*3f9d6ad7SLin Ling /* 817*3f9d6ad7SLin Ling * For non-user-accounting blocks, we need to read the 818*3f9d6ad7SLin Ling * new bp (from a deleted snapshot, found in 819*3f9d6ad7SLin Ling * check_existing_xlation). If we used the old bp, 820*3f9d6ad7SLin Ling * pointers inside this block from before we resumed 821*3f9d6ad7SLin Ling * would be untranslated. 822*3f9d6ad7SLin Ling * 823*3f9d6ad7SLin Ling * For user-accounting blocks, we need to read the old 824*3f9d6ad7SLin Ling * bp, because we will apply the entire space delta to 825*3f9d6ad7SLin Ling * it (original untranslated -> translations from 826*3f9d6ad7SLin Ling * deleted snap -> now). 827*3f9d6ad7SLin Ling */ 828*3f9d6ad7SLin Ling bp_toread = *bp; 829*3f9d6ad7SLin Ling } 830*3f9d6ad7SLin Ling 831*3f9d6ad7SLin Ling if (dsl_scan_recurse(scn, ds, ostype, dnp, &bp_toread, zb, tx, 832*3f9d6ad7SLin Ling &buf) != 0) 833*3f9d6ad7SLin Ling return; 834*3f9d6ad7SLin Ling 835*3f9d6ad7SLin Ling /* 836*3f9d6ad7SLin Ling * If dsl_scan_ddt() has aready visited this block, it will have 837*3f9d6ad7SLin Ling * already done any translations or scrubbing, so don't call the 838*3f9d6ad7SLin Ling * callback again. 839*3f9d6ad7SLin Ling */ 840*3f9d6ad7SLin Ling if (ddt_class_contains(dp->dp_spa, 841*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max, bp)) { 842*3f9d6ad7SLin Ling ASSERT(buf == NULL); 843*3f9d6ad7SLin Ling return; 844*3f9d6ad7SLin Ling } 845*3f9d6ad7SLin Ling 846*3f9d6ad7SLin Ling /* 847*3f9d6ad7SLin Ling * If this block is from the future (after cur_max_txg), then we 848*3f9d6ad7SLin Ling * are doing this on behalf of a deleted snapshot, and we will 849*3f9d6ad7SLin Ling * revisit the future block on the next pass of this dataset. 850*3f9d6ad7SLin Ling * Don't scan it now unless we need to because something 851*3f9d6ad7SLin Ling * under it was modified. 852*3f9d6ad7SLin Ling */ 853*3f9d6ad7SLin Ling if (bp->blk_birth <= scn->scn_phys.scn_cur_max_txg) { 854*3f9d6ad7SLin Ling scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); 855*3f9d6ad7SLin Ling } 856*3f9d6ad7SLin Ling if (buf) 857*3f9d6ad7SLin Ling (void) arc_buf_remove_ref(buf, &buf); 858*3f9d6ad7SLin Ling } 859*3f9d6ad7SLin Ling 860*3f9d6ad7SLin Ling static void 861*3f9d6ad7SLin Ling dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, 862*3f9d6ad7SLin Ling dmu_tx_t *tx) 863*3f9d6ad7SLin Ling { 864*3f9d6ad7SLin Ling zbookmark_t zb; 865*3f9d6ad7SLin Ling 866*3f9d6ad7SLin Ling SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 867*3f9d6ad7SLin Ling ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 868*3f9d6ad7SLin Ling dsl_scan_visitbp(bp, &zb, NULL, NULL, 869*3f9d6ad7SLin Ling ds, scn, DMU_OST_NONE, tx); 870*3f9d6ad7SLin Ling 871*3f9d6ad7SLin Ling dprintf_ds(ds, "finished scan%s", ""); 872*3f9d6ad7SLin Ling } 873*3f9d6ad7SLin Ling 874*3f9d6ad7SLin Ling void 875*3f9d6ad7SLin Ling dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) 876*3f9d6ad7SLin Ling { 877*3f9d6ad7SLin Ling dsl_pool_t *dp = ds->ds_dir->dd_pool; 878*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 879*3f9d6ad7SLin Ling uint64_t mintxg; 880*3f9d6ad7SLin Ling 881*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 882*3f9d6ad7SLin Ling return; 883*3f9d6ad7SLin Ling 884*3f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { 885*3f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) { 886*3f9d6ad7SLin Ling /* Note, scn_cur_{min,max}_txg stays the same. */ 887*3f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = 888*3f9d6ad7SLin Ling ds->ds_phys->ds_next_snap_obj; 889*3f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; currently traversing; " 890*3f9d6ad7SLin Ling "reset zb_objset to %llu", 891*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 892*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_next_snap_obj); 893*3f9d6ad7SLin Ling scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN; 894*3f9d6ad7SLin Ling } else { 895*3f9d6ad7SLin Ling SET_BOOKMARK(&scn->scn_phys.scn_bookmark, 896*3f9d6ad7SLin Ling ZB_DESTROYED_OBJSET, 0, 0, 0); 897*3f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; currently traversing; " 898*3f9d6ad7SLin Ling "reset bookmark to -1,0,0,0", 899*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 900*3f9d6ad7SLin Ling } 901*3f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 902*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { 903*3f9d6ad7SLin Ling ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 904*3f9d6ad7SLin Ling VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 905*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); 906*3f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) { 907*3f9d6ad7SLin Ling /* 908*3f9d6ad7SLin Ling * We keep the same mintxg; it could be > 909*3f9d6ad7SLin Ling * ds_creation_txg if the previous snapshot was 910*3f9d6ad7SLin Ling * deleted too. 911*3f9d6ad7SLin Ling */ 912*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 913*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 914*3f9d6ad7SLin Ling ds->ds_phys->ds_next_snap_obj, mintxg, tx) == 0); 915*3f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; in queue; " 916*3f9d6ad7SLin Ling "replacing with %llu", 917*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 918*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_next_snap_obj); 919*3f9d6ad7SLin Ling } else { 920*3f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; in queue; removing", 921*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 922*3f9d6ad7SLin Ling } 923*3f9d6ad7SLin Ling } else { 924*3f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; ignoring", 925*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 926*3f9d6ad7SLin Ling } 927*3f9d6ad7SLin Ling 928*3f9d6ad7SLin Ling /* 929*3f9d6ad7SLin Ling * dsl_scan_sync() should be called after this, and should sync 930*3f9d6ad7SLin Ling * out our changed state, but just to be safe, do it here. 931*3f9d6ad7SLin Ling */ 932*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 933*3f9d6ad7SLin Ling } 934*3f9d6ad7SLin Ling 935*3f9d6ad7SLin Ling void 936*3f9d6ad7SLin Ling dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) 937*3f9d6ad7SLin Ling { 938*3f9d6ad7SLin Ling dsl_pool_t *dp = ds->ds_dir->dd_pool; 939*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 940*3f9d6ad7SLin Ling uint64_t mintxg; 941*3f9d6ad7SLin Ling 942*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 943*3f9d6ad7SLin Ling return; 944*3f9d6ad7SLin Ling 945*3f9d6ad7SLin Ling ASSERT(ds->ds_phys->ds_prev_snap_obj != 0); 946*3f9d6ad7SLin Ling 947*3f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { 948*3f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = 949*3f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_obj; 950*3f9d6ad7SLin Ling zfs_dbgmsg("snapshotting ds %llu; currently traversing; " 951*3f9d6ad7SLin Ling "reset zb_objset to %llu", 952*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 953*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); 954*3f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 955*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { 956*3f9d6ad7SLin Ling VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 957*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); 958*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 959*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 960*3f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_obj, mintxg, tx) == 0); 961*3f9d6ad7SLin Ling zfs_dbgmsg("snapshotting ds %llu; in queue; " 962*3f9d6ad7SLin Ling "replacing with %llu", 963*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 964*3f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); 965*3f9d6ad7SLin Ling } 966*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 967*3f9d6ad7SLin Ling } 968*3f9d6ad7SLin Ling 969*3f9d6ad7SLin Ling void 970*3f9d6ad7SLin Ling dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) 971*3f9d6ad7SLin Ling { 972*3f9d6ad7SLin Ling dsl_pool_t *dp = ds1->ds_dir->dd_pool; 973*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 974*3f9d6ad7SLin Ling uint64_t mintxg; 975*3f9d6ad7SLin Ling 976*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 977*3f9d6ad7SLin Ling return; 978*3f9d6ad7SLin Ling 979*3f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) { 980*3f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object; 981*3f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; currently traversing; " 982*3f9d6ad7SLin Ling "reset zb_objset to %llu", 983*3f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object, 984*3f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object); 985*3f9d6ad7SLin Ling } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) { 986*3f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object; 987*3f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; currently traversing; " 988*3f9d6ad7SLin Ling "reset zb_objset to %llu", 989*3f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object, 990*3f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object); 991*3f9d6ad7SLin Ling } 992*3f9d6ad7SLin Ling 993*3f9d6ad7SLin Ling if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, 994*3f9d6ad7SLin Ling ds1->ds_object, &mintxg) == 0) { 995*3f9d6ad7SLin Ling int err; 996*3f9d6ad7SLin Ling 997*3f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); 998*3f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); 999*3f9d6ad7SLin Ling VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 1000*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); 1001*3f9d6ad7SLin Ling err = zap_add_int_key(dp->dp_meta_objset, 1002*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); 1003*3f9d6ad7SLin Ling VERIFY(err == 0 || err == EEXIST); 1004*3f9d6ad7SLin Ling if (err == EEXIST) { 1005*3f9d6ad7SLin Ling /* Both were there to begin with */ 1006*3f9d6ad7SLin Ling VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, 1007*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 1008*3f9d6ad7SLin Ling ds1->ds_object, mintxg, tx)); 1009*3f9d6ad7SLin Ling } 1010*3f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; in queue; " 1011*3f9d6ad7SLin Ling "replacing with %llu", 1012*3f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object, 1013*3f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object); 1014*3f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 1015*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) { 1016*3f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); 1017*3f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); 1018*3f9d6ad7SLin Ling VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 1019*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); 1020*3f9d6ad7SLin Ling VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, 1021*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); 1022*3f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; in queue; " 1023*3f9d6ad7SLin Ling "replacing with %llu", 1024*3f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object, 1025*3f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object); 1026*3f9d6ad7SLin Ling } 1027*3f9d6ad7SLin Ling 1028*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 1029*3f9d6ad7SLin Ling } 1030*3f9d6ad7SLin Ling 1031*3f9d6ad7SLin Ling struct enqueue_clones_arg { 1032*3f9d6ad7SLin Ling dmu_tx_t *tx; 1033*3f9d6ad7SLin Ling uint64_t originobj; 1034*3f9d6ad7SLin Ling }; 1035*3f9d6ad7SLin Ling 1036*3f9d6ad7SLin Ling /* ARGSUSED */ 1037*3f9d6ad7SLin Ling static int 1038*3f9d6ad7SLin Ling enqueue_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1039*3f9d6ad7SLin Ling { 1040*3f9d6ad7SLin Ling struct enqueue_clones_arg *eca = arg; 1041*3f9d6ad7SLin Ling dsl_dataset_t *ds; 1042*3f9d6ad7SLin Ling int err; 1043*3f9d6ad7SLin Ling dsl_pool_t *dp = spa->spa_dsl_pool; 1044*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 1045*3f9d6ad7SLin Ling 1046*3f9d6ad7SLin Ling err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds); 1047*3f9d6ad7SLin Ling if (err) 1048*3f9d6ad7SLin Ling return (err); 1049*3f9d6ad7SLin Ling 1050*3f9d6ad7SLin Ling if (ds->ds_dir->dd_phys->dd_origin_obj == eca->originobj) { 1051*3f9d6ad7SLin Ling while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) { 1052*3f9d6ad7SLin Ling dsl_dataset_t *prev; 1053*3f9d6ad7SLin Ling err = dsl_dataset_hold_obj(dp, 1054*3f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 1055*3f9d6ad7SLin Ling 1056*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1057*3f9d6ad7SLin Ling if (err) 1058*3f9d6ad7SLin Ling return (err); 1059*3f9d6ad7SLin Ling ds = prev; 1060*3f9d6ad7SLin Ling } 1061*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 1062*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, 1063*3f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_txg, eca->tx) == 0); 1064*3f9d6ad7SLin Ling } 1065*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1066*3f9d6ad7SLin Ling return (0); 1067*3f9d6ad7SLin Ling } 1068*3f9d6ad7SLin Ling 1069*3f9d6ad7SLin Ling static void 1070*3f9d6ad7SLin Ling dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) 1071*3f9d6ad7SLin Ling { 1072*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 1073*3f9d6ad7SLin Ling dsl_dataset_t *ds; 1074*3f9d6ad7SLin Ling 1075*3f9d6ad7SLin Ling VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1076*3f9d6ad7SLin Ling 1077*3f9d6ad7SLin Ling /* 1078*3f9d6ad7SLin Ling * Iterate over the bps in this ds. 1079*3f9d6ad7SLin Ling */ 1080*3f9d6ad7SLin Ling dmu_buf_will_dirty(ds->ds_dbuf, tx); 1081*3f9d6ad7SLin Ling dsl_scan_visit_rootbp(scn, ds, &ds->ds_phys->ds_bp, tx); 1082*3f9d6ad7SLin Ling 1083*3f9d6ad7SLin Ling char *dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_SLEEP); 1084*3f9d6ad7SLin Ling dsl_dataset_name(ds, dsname); 1085*3f9d6ad7SLin Ling zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; " 1086*3f9d6ad7SLin Ling "pausing=%u", 1087*3f9d6ad7SLin Ling (longlong_t)dsobj, dsname, 1088*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_cur_min_txg, 1089*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_cur_max_txg, 1090*3f9d6ad7SLin Ling (int)scn->scn_pausing); 1091*3f9d6ad7SLin Ling kmem_free(dsname, ZFS_MAXNAMELEN); 1092*3f9d6ad7SLin Ling 1093*3f9d6ad7SLin Ling if (scn->scn_pausing) 1094*3f9d6ad7SLin Ling goto out; 1095*3f9d6ad7SLin Ling 1096*3f9d6ad7SLin Ling /* 1097*3f9d6ad7SLin Ling * We've finished this pass over this dataset. 1098*3f9d6ad7SLin Ling */ 1099*3f9d6ad7SLin Ling 1100*3f9d6ad7SLin Ling /* 1101*3f9d6ad7SLin Ling * If we did not completely visit this dataset, do another pass. 1102*3f9d6ad7SLin Ling */ 1103*3f9d6ad7SLin Ling if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) { 1104*3f9d6ad7SLin Ling zfs_dbgmsg("incomplete pass; visiting again"); 1105*3f9d6ad7SLin Ling scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN; 1106*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 1107*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, 1108*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg, tx) == 0); 1109*3f9d6ad7SLin Ling goto out; 1110*3f9d6ad7SLin Ling } 1111*3f9d6ad7SLin Ling 1112*3f9d6ad7SLin Ling /* 1113*3f9d6ad7SLin Ling * Add descendent datasets to work queue. 1114*3f9d6ad7SLin Ling */ 1115*3f9d6ad7SLin Ling if (ds->ds_phys->ds_next_snap_obj != 0) { 1116*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 1117*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_phys->ds_next_snap_obj, 1118*3f9d6ad7SLin Ling ds->ds_phys->ds_creation_txg, tx) == 0); 1119*3f9d6ad7SLin Ling } 1120*3f9d6ad7SLin Ling if (ds->ds_phys->ds_num_children > 1) { 1121*3f9d6ad7SLin Ling boolean_t usenext = B_FALSE; 1122*3f9d6ad7SLin Ling if (ds->ds_phys->ds_next_clones_obj != 0) { 1123*3f9d6ad7SLin Ling uint64_t count; 1124*3f9d6ad7SLin Ling /* 1125*3f9d6ad7SLin Ling * A bug in a previous version of the code could 1126*3f9d6ad7SLin Ling * cause upgrade_clones_cb() to not set 1127*3f9d6ad7SLin Ling * ds_next_snap_obj when it should, leading to a 1128*3f9d6ad7SLin Ling * missing entry. Therefore we can only use the 1129*3f9d6ad7SLin Ling * next_clones_obj when its count is correct. 1130*3f9d6ad7SLin Ling */ 1131*3f9d6ad7SLin Ling int err = zap_count(dp->dp_meta_objset, 1132*3f9d6ad7SLin Ling ds->ds_phys->ds_next_clones_obj, &count); 1133*3f9d6ad7SLin Ling if (err == 0 && 1134*3f9d6ad7SLin Ling count == ds->ds_phys->ds_num_children - 1) 1135*3f9d6ad7SLin Ling usenext = B_TRUE; 1136*3f9d6ad7SLin Ling } 1137*3f9d6ad7SLin Ling 1138*3f9d6ad7SLin Ling if (usenext) { 1139*3f9d6ad7SLin Ling VERIFY(zap_join_key(dp->dp_meta_objset, 1140*3f9d6ad7SLin Ling ds->ds_phys->ds_next_clones_obj, 1141*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 1142*3f9d6ad7SLin Ling ds->ds_phys->ds_creation_txg, tx) == 0); 1143*3f9d6ad7SLin Ling } else { 1144*3f9d6ad7SLin Ling struct enqueue_clones_arg eca; 1145*3f9d6ad7SLin Ling eca.tx = tx; 1146*3f9d6ad7SLin Ling eca.originobj = ds->ds_object; 1147*3f9d6ad7SLin Ling 1148*3f9d6ad7SLin Ling (void) dmu_objset_find_spa(ds->ds_dir->dd_pool->dp_spa, 1149*3f9d6ad7SLin Ling NULL, enqueue_clones_cb, &eca, DS_FIND_CHILDREN); 1150*3f9d6ad7SLin Ling } 1151*3f9d6ad7SLin Ling } 1152*3f9d6ad7SLin Ling 1153*3f9d6ad7SLin Ling out: 1154*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1155*3f9d6ad7SLin Ling } 1156*3f9d6ad7SLin Ling 1157*3f9d6ad7SLin Ling /* ARGSUSED */ 1158*3f9d6ad7SLin Ling static int 1159*3f9d6ad7SLin Ling enqueue_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1160*3f9d6ad7SLin Ling { 1161*3f9d6ad7SLin Ling dmu_tx_t *tx = arg; 1162*3f9d6ad7SLin Ling dsl_dataset_t *ds; 1163*3f9d6ad7SLin Ling int err; 1164*3f9d6ad7SLin Ling dsl_pool_t *dp = spa->spa_dsl_pool; 1165*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 1166*3f9d6ad7SLin Ling 1167*3f9d6ad7SLin Ling err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds); 1168*3f9d6ad7SLin Ling if (err) 1169*3f9d6ad7SLin Ling return (err); 1170*3f9d6ad7SLin Ling 1171*3f9d6ad7SLin Ling while (ds->ds_phys->ds_prev_snap_obj != 0) { 1172*3f9d6ad7SLin Ling dsl_dataset_t *prev; 1173*3f9d6ad7SLin Ling err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, 1174*3f9d6ad7SLin Ling FTAG, &prev); 1175*3f9d6ad7SLin Ling if (err) { 1176*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1177*3f9d6ad7SLin Ling return (err); 1178*3f9d6ad7SLin Ling } 1179*3f9d6ad7SLin Ling 1180*3f9d6ad7SLin Ling /* 1181*3f9d6ad7SLin Ling * If this is a clone, we don't need to worry about it for now. 1182*3f9d6ad7SLin Ling */ 1183*3f9d6ad7SLin Ling if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 1184*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1185*3f9d6ad7SLin Ling dsl_dataset_rele(prev, FTAG); 1186*3f9d6ad7SLin Ling return (0); 1187*3f9d6ad7SLin Ling } 1188*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1189*3f9d6ad7SLin Ling ds = prev; 1190*3f9d6ad7SLin Ling } 1191*3f9d6ad7SLin Ling 1192*3f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, 1193*3f9d6ad7SLin Ling ds->ds_object, ds->ds_phys->ds_prev_snap_txg, tx) == 0); 1194*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1195*3f9d6ad7SLin Ling return (0); 1196*3f9d6ad7SLin Ling } 1197*3f9d6ad7SLin Ling 1198*3f9d6ad7SLin Ling /* 1199*3f9d6ad7SLin Ling * Scrub/dedup interaction. 1200*3f9d6ad7SLin Ling * 1201*3f9d6ad7SLin Ling * If there are N references to a deduped block, we don't want to scrub it 1202*3f9d6ad7SLin Ling * N times -- ideally, we should scrub it exactly once. 1203*3f9d6ad7SLin Ling * 1204*3f9d6ad7SLin Ling * We leverage the fact that the dde's replication class (enum ddt_class) 1205*3f9d6ad7SLin Ling * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest 1206*3f9d6ad7SLin Ling * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order. 1207*3f9d6ad7SLin Ling * 1208*3f9d6ad7SLin Ling * To prevent excess scrubbing, the scrub begins by walking the DDT 1209*3f9d6ad7SLin Ling * to find all blocks with refcnt > 1, and scrubs each of these once. 1210*3f9d6ad7SLin Ling * Since there are two replication classes which contain blocks with 1211*3f9d6ad7SLin Ling * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first. 1212*3f9d6ad7SLin Ling * Finally the top-down scrub begins, only visiting blocks with refcnt == 1. 1213*3f9d6ad7SLin Ling * 1214*3f9d6ad7SLin Ling * There would be nothing more to say if a block's refcnt couldn't change 1215*3f9d6ad7SLin Ling * during a scrub, but of course it can so we must account for changes 1216*3f9d6ad7SLin Ling * in a block's replication class. 1217*3f9d6ad7SLin Ling * 1218*3f9d6ad7SLin Ling * Here's an example of what can occur: 1219*3f9d6ad7SLin Ling * 1220*3f9d6ad7SLin Ling * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1 1221*3f9d6ad7SLin Ling * when visited during the top-down scrub phase, it will be scrubbed twice. 1222*3f9d6ad7SLin Ling * This negates our scrub optimization, but is otherwise harmless. 1223*3f9d6ad7SLin Ling * 1224*3f9d6ad7SLin Ling * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1 1225*3f9d6ad7SLin Ling * on each visit during the top-down scrub phase, it will never be scrubbed. 1226*3f9d6ad7SLin Ling * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's 1227*3f9d6ad7SLin Ling * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to 1228*3f9d6ad7SLin Ling * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1 1229*3f9d6ad7SLin Ling * while a scrub is in progress, it scrubs the block right then. 1230*3f9d6ad7SLin Ling */ 1231*3f9d6ad7SLin Ling static void 1232*3f9d6ad7SLin Ling dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx) 1233*3f9d6ad7SLin Ling { 1234*3f9d6ad7SLin Ling ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark; 1235*3f9d6ad7SLin Ling ddt_entry_t dde = { 0 }; 1236*3f9d6ad7SLin Ling int error; 1237*3f9d6ad7SLin Ling uint64_t n = 0; 1238*3f9d6ad7SLin Ling 1239*3f9d6ad7SLin Ling while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { 1240*3f9d6ad7SLin Ling ddt_t *ddt; 1241*3f9d6ad7SLin Ling 1242*3f9d6ad7SLin Ling if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) 1243*3f9d6ad7SLin Ling break; 1244*3f9d6ad7SLin Ling dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", 1245*3f9d6ad7SLin Ling (longlong_t)ddb->ddb_class, 1246*3f9d6ad7SLin Ling (longlong_t)ddb->ddb_type, 1247*3f9d6ad7SLin Ling (longlong_t)ddb->ddb_checksum, 1248*3f9d6ad7SLin Ling (longlong_t)ddb->ddb_cursor); 1249*3f9d6ad7SLin Ling 1250*3f9d6ad7SLin Ling /* There should be no pending changes to the dedup table */ 1251*3f9d6ad7SLin Ling ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; 1252*3f9d6ad7SLin Ling ASSERT(avl_first(&ddt->ddt_tree) == NULL); 1253*3f9d6ad7SLin Ling 1254*3f9d6ad7SLin Ling dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); 1255*3f9d6ad7SLin Ling n++; 1256*3f9d6ad7SLin Ling 1257*3f9d6ad7SLin Ling if (dsl_scan_check_pause(scn, NULL)) 1258*3f9d6ad7SLin Ling break; 1259*3f9d6ad7SLin Ling } 1260*3f9d6ad7SLin Ling 1261*3f9d6ad7SLin Ling zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u", 1262*3f9d6ad7SLin Ling (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max, 1263*3f9d6ad7SLin Ling (int)scn->scn_pausing); 1264*3f9d6ad7SLin Ling 1265*3f9d6ad7SLin Ling ASSERT(error == 0 || error == ENOENT); 1266*3f9d6ad7SLin Ling ASSERT(error != ENOENT || 1267*3f9d6ad7SLin Ling ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); 1268*3f9d6ad7SLin Ling } 1269*3f9d6ad7SLin Ling 1270*3f9d6ad7SLin Ling /* ARGSUSED */ 1271*3f9d6ad7SLin Ling void 1272*3f9d6ad7SLin Ling dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, 1273*3f9d6ad7SLin Ling ddt_entry_t *dde, dmu_tx_t *tx) 1274*3f9d6ad7SLin Ling { 1275*3f9d6ad7SLin Ling const ddt_key_t *ddk = &dde->dde_key; 1276*3f9d6ad7SLin Ling ddt_phys_t *ddp = dde->dde_phys; 1277*3f9d6ad7SLin Ling blkptr_t bp; 1278*3f9d6ad7SLin Ling zbookmark_t zb = { 0 }; 1279*3f9d6ad7SLin Ling 1280*3f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 1281*3f9d6ad7SLin Ling return; 1282*3f9d6ad7SLin Ling 1283*3f9d6ad7SLin Ling for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 1284*3f9d6ad7SLin Ling if (ddp->ddp_phys_birth == 0 || 1285*3f9d6ad7SLin Ling ddp->ddp_phys_birth > scn->scn_phys.scn_cur_max_txg) 1286*3f9d6ad7SLin Ling continue; 1287*3f9d6ad7SLin Ling ddt_bp_create(checksum, ddk, ddp, &bp); 1288*3f9d6ad7SLin Ling 1289*3f9d6ad7SLin Ling scn->scn_visited_this_txg++; 1290*3f9d6ad7SLin Ling scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); 1291*3f9d6ad7SLin Ling } 1292*3f9d6ad7SLin Ling } 1293*3f9d6ad7SLin Ling 1294*3f9d6ad7SLin Ling static void 1295*3f9d6ad7SLin Ling dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) 1296*3f9d6ad7SLin Ling { 1297*3f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 1298*3f9d6ad7SLin Ling zap_cursor_t zc; 1299*3f9d6ad7SLin Ling zap_attribute_t za; 1300*3f9d6ad7SLin Ling 1301*3f9d6ad7SLin Ling if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= 1302*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max) { 1303*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; 1304*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; 1305*3f9d6ad7SLin Ling dsl_scan_ddt(scn, tx); 1306*3f9d6ad7SLin Ling if (scn->scn_pausing) 1307*3f9d6ad7SLin Ling return; 1308*3f9d6ad7SLin Ling } 1309*3f9d6ad7SLin Ling 1310*3f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { 1311*3f9d6ad7SLin Ling /* First do the MOS & ORIGIN */ 1312*3f9d6ad7SLin Ling 1313*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; 1314*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; 1315*3f9d6ad7SLin Ling dsl_scan_visit_rootbp(scn, NULL, 1316*3f9d6ad7SLin Ling &dp->dp_meta_rootbp, tx); 1317*3f9d6ad7SLin Ling spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); 1318*3f9d6ad7SLin Ling if (scn->scn_pausing) 1319*3f9d6ad7SLin Ling return; 1320*3f9d6ad7SLin Ling 1321*3f9d6ad7SLin Ling if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { 1322*3f9d6ad7SLin Ling VERIFY(0 == dmu_objset_find_spa(dp->dp_spa, 1323*3f9d6ad7SLin Ling NULL, enqueue_cb, tx, DS_FIND_CHILDREN)); 1324*3f9d6ad7SLin Ling } else { 1325*3f9d6ad7SLin Ling dsl_scan_visitds(scn, 1326*3f9d6ad7SLin Ling dp->dp_origin_snap->ds_object, tx); 1327*3f9d6ad7SLin Ling } 1328*3f9d6ad7SLin Ling ASSERT(!scn->scn_pausing); 1329*3f9d6ad7SLin Ling } else if (scn->scn_phys.scn_bookmark.zb_objset != 1330*3f9d6ad7SLin Ling ZB_DESTROYED_OBJSET) { 1331*3f9d6ad7SLin Ling /* 1332*3f9d6ad7SLin Ling * If we were paused, continue from here. Note if the 1333*3f9d6ad7SLin Ling * ds we were paused on was deleted, the zb_objset may 1334*3f9d6ad7SLin Ling * be -1, so we will skip this and find a new objset 1335*3f9d6ad7SLin Ling * below. 1336*3f9d6ad7SLin Ling */ 1337*3f9d6ad7SLin Ling dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx); 1338*3f9d6ad7SLin Ling if (scn->scn_pausing) 1339*3f9d6ad7SLin Ling return; 1340*3f9d6ad7SLin Ling } 1341*3f9d6ad7SLin Ling 1342*3f9d6ad7SLin Ling /* 1343*3f9d6ad7SLin Ling * In case we were paused right at the end of the ds, zero the 1344*3f9d6ad7SLin Ling * bookmark so we don't think that we're still trying to resume. 1345*3f9d6ad7SLin Ling */ 1346*3f9d6ad7SLin Ling bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_t)); 1347*3f9d6ad7SLin Ling 1348*3f9d6ad7SLin Ling /* keep pulling things out of the zap-object-as-queue */ 1349*3f9d6ad7SLin Ling while (zap_cursor_init(&zc, dp->dp_meta_objset, 1350*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj), 1351*3f9d6ad7SLin Ling zap_cursor_retrieve(&zc, &za) == 0) { 1352*3f9d6ad7SLin Ling dsl_dataset_t *ds; 1353*3f9d6ad7SLin Ling uint64_t dsobj; 1354*3f9d6ad7SLin Ling 1355*3f9d6ad7SLin Ling dsobj = strtonum(za.za_name, NULL); 1356*3f9d6ad7SLin Ling VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 1357*3f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, dsobj, tx)); 1358*3f9d6ad7SLin Ling 1359*3f9d6ad7SLin Ling /* Set up min/max txg */ 1360*3f9d6ad7SLin Ling VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1361*3f9d6ad7SLin Ling if (za.za_first_integer != 0) { 1362*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = 1363*3f9d6ad7SLin Ling MAX(scn->scn_phys.scn_min_txg, 1364*3f9d6ad7SLin Ling za.za_first_integer); 1365*3f9d6ad7SLin Ling } else { 1366*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = 1367*3f9d6ad7SLin Ling MAX(scn->scn_phys.scn_min_txg, 1368*3f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_txg); 1369*3f9d6ad7SLin Ling } 1370*3f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); 1371*3f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 1372*3f9d6ad7SLin Ling 1373*3f9d6ad7SLin Ling dsl_scan_visitds(scn, dsobj, tx); 1374*3f9d6ad7SLin Ling zap_cursor_fini(&zc); 1375*3f9d6ad7SLin Ling if (scn->scn_pausing) 1376*3f9d6ad7SLin Ling return; 1377*3f9d6ad7SLin Ling } 1378*3f9d6ad7SLin Ling zap_cursor_fini(&zc); 1379*3f9d6ad7SLin Ling } 1380*3f9d6ad7SLin Ling 1381*3f9d6ad7SLin Ling void 1382*3f9d6ad7SLin Ling dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) 1383*3f9d6ad7SLin Ling { 1384*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 1385*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 1386*3f9d6ad7SLin Ling 1387*3f9d6ad7SLin Ling /* 1388*3f9d6ad7SLin Ling * Check for scn_restart_txg before checking spa_load_state, so 1389*3f9d6ad7SLin Ling * that we can restart an old-style scan while the pool is being 1390*3f9d6ad7SLin Ling * imported (see dsl_scan_init). 1391*3f9d6ad7SLin Ling */ 1392*3f9d6ad7SLin Ling if (scn->scn_restart_txg != 0 && 1393*3f9d6ad7SLin Ling scn->scn_restart_txg <= tx->tx_txg) { 1394*3f9d6ad7SLin Ling pool_scan_func_t func = POOL_SCAN_SCRUB; 1395*3f9d6ad7SLin Ling dsl_scan_done(scn, B_FALSE, tx); 1396*3f9d6ad7SLin Ling if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) 1397*3f9d6ad7SLin Ling func = POOL_SCAN_RESILVER; 1398*3f9d6ad7SLin Ling zfs_dbgmsg("restarting scan func=%u txg=%llu", 1399*3f9d6ad7SLin Ling func, tx->tx_txg); 1400*3f9d6ad7SLin Ling dsl_scan_setup_sync(scn, &func, tx); 1401*3f9d6ad7SLin Ling } 1402*3f9d6ad7SLin Ling 1403*3f9d6ad7SLin Ling if (dp->dp_spa->spa_load_state != SPA_LOAD_NONE || 1404*3f9d6ad7SLin Ling spa_shutting_down(spa) || 1405*3f9d6ad7SLin Ling spa_sync_pass(dp->dp_spa) > 1 || 1406*3f9d6ad7SLin Ling scn->scn_phys.scn_state != DSS_SCANNING) 1407*3f9d6ad7SLin Ling return; 1408*3f9d6ad7SLin Ling 1409*3f9d6ad7SLin Ling scn->scn_visited_this_txg = 0; 1410*3f9d6ad7SLin Ling scn->scn_pausing = B_FALSE; 1411*3f9d6ad7SLin Ling scn->scn_sync_start_time = gethrtime(); 1412*3f9d6ad7SLin Ling spa->spa_scrub_active = B_TRUE; 1413*3f9d6ad7SLin Ling 1414*3f9d6ad7SLin Ling if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= 1415*3f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max) { 1416*3f9d6ad7SLin Ling zfs_dbgmsg("doing scan sync txg %llu; " 1417*3f9d6ad7SLin Ling "ddt bm=%llu/%llu/%llu/%llx", 1418*3f9d6ad7SLin Ling (longlong_t)tx->tx_txg, 1419*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, 1420*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, 1421*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, 1422*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); 1423*3f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0); 1424*3f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0); 1425*3f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0); 1426*3f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0); 1427*3f9d6ad7SLin Ling } else { 1428*3f9d6ad7SLin Ling zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu", 1429*3f9d6ad7SLin Ling (longlong_t)tx->tx_txg, 1430*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_objset, 1431*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_object, 1432*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_level, 1433*3f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid); 1434*3f9d6ad7SLin Ling } 1435*3f9d6ad7SLin Ling 1436*3f9d6ad7SLin Ling scn->scn_prefetch_zio_root = zio_root(dp->dp_spa, NULL, 1437*3f9d6ad7SLin Ling NULL, ZIO_FLAG_CANFAIL); 1438*3f9d6ad7SLin Ling dsl_scan_visit(scn, tx); 1439*3f9d6ad7SLin Ling (void) zio_wait(scn->scn_prefetch_zio_root); 1440*3f9d6ad7SLin Ling scn->scn_prefetch_zio_root = NULL; 1441*3f9d6ad7SLin Ling 1442*3f9d6ad7SLin Ling zfs_dbgmsg("visited %llu blocks in %llums", 1443*3f9d6ad7SLin Ling (longlong_t)scn->scn_visited_this_txg, 1444*3f9d6ad7SLin Ling (longlong_t)(gethrtime() - scn->scn_sync_start_time) / MICROSEC); 1445*3f9d6ad7SLin Ling 1446*3f9d6ad7SLin Ling if (!scn->scn_pausing) { 1447*3f9d6ad7SLin Ling /* finished with scan. */ 1448*3f9d6ad7SLin Ling zfs_dbgmsg("finished scan txg %llu", (longlong_t)tx->tx_txg); 1449*3f9d6ad7SLin Ling dsl_scan_done(scn, B_TRUE, tx); 1450*3f9d6ad7SLin Ling } 1451*3f9d6ad7SLin Ling 1452*3f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 1453*3f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 1454*3f9d6ad7SLin Ling while (spa->spa_scrub_inflight > 0) { 1455*3f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, 1456*3f9d6ad7SLin Ling &spa->spa_scrub_lock); 1457*3f9d6ad7SLin Ling } 1458*3f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 1459*3f9d6ad7SLin Ling } 1460*3f9d6ad7SLin Ling 1461*3f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 1462*3f9d6ad7SLin Ling } 1463*3f9d6ad7SLin Ling 1464*3f9d6ad7SLin Ling /* 1465*3f9d6ad7SLin Ling * This will start a new scan, or restart an existing one. 1466*3f9d6ad7SLin Ling */ 1467*3f9d6ad7SLin Ling void 1468*3f9d6ad7SLin Ling dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) 1469*3f9d6ad7SLin Ling { 1470*3f9d6ad7SLin Ling if (txg == 0) { 1471*3f9d6ad7SLin Ling dmu_tx_t *tx; 1472*3f9d6ad7SLin Ling tx = dmu_tx_create_dd(dp->dp_mos_dir); 1473*3f9d6ad7SLin Ling VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); 1474*3f9d6ad7SLin Ling 1475*3f9d6ad7SLin Ling txg = dmu_tx_get_txg(tx); 1476*3f9d6ad7SLin Ling dp->dp_scan->scn_restart_txg = txg; 1477*3f9d6ad7SLin Ling dmu_tx_commit(tx); 1478*3f9d6ad7SLin Ling } else { 1479*3f9d6ad7SLin Ling dp->dp_scan->scn_restart_txg = txg; 1480*3f9d6ad7SLin Ling } 1481*3f9d6ad7SLin Ling zfs_dbgmsg("restarting resilver txg=%llu", txg); 1482*3f9d6ad7SLin Ling } 1483*3f9d6ad7SLin Ling 1484*3f9d6ad7SLin Ling boolean_t 1485*3f9d6ad7SLin Ling dsl_scan_resilvering(dsl_pool_t *dp) 1486*3f9d6ad7SLin Ling { 1487*3f9d6ad7SLin Ling return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING && 1488*3f9d6ad7SLin Ling dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); 1489*3f9d6ad7SLin Ling } 1490*3f9d6ad7SLin Ling 1491*3f9d6ad7SLin Ling /* 1492*3f9d6ad7SLin Ling * scrub consumers 1493*3f9d6ad7SLin Ling */ 1494*3f9d6ad7SLin Ling 1495*3f9d6ad7SLin Ling static void 1496*3f9d6ad7SLin Ling count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) 1497*3f9d6ad7SLin Ling { 1498*3f9d6ad7SLin Ling int i; 1499*3f9d6ad7SLin Ling 1500*3f9d6ad7SLin Ling /* 1501*3f9d6ad7SLin Ling * If we resume after a reboot, zab will be NULL; don't record 1502*3f9d6ad7SLin Ling * incomplete stats in that case. 1503*3f9d6ad7SLin Ling */ 1504*3f9d6ad7SLin Ling if (zab == NULL) 1505*3f9d6ad7SLin Ling return; 1506*3f9d6ad7SLin Ling 1507*3f9d6ad7SLin Ling for (i = 0; i < 4; i++) { 1508*3f9d6ad7SLin Ling int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; 1509*3f9d6ad7SLin Ling int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; 1510*3f9d6ad7SLin Ling zfs_blkstat_t *zb = &zab->zab_type[l][t]; 1511*3f9d6ad7SLin Ling int equal; 1512*3f9d6ad7SLin Ling 1513*3f9d6ad7SLin Ling zb->zb_count++; 1514*3f9d6ad7SLin Ling zb->zb_asize += BP_GET_ASIZE(bp); 1515*3f9d6ad7SLin Ling zb->zb_lsize += BP_GET_LSIZE(bp); 1516*3f9d6ad7SLin Ling zb->zb_psize += BP_GET_PSIZE(bp); 1517*3f9d6ad7SLin Ling zb->zb_gangs += BP_COUNT_GANG(bp); 1518*3f9d6ad7SLin Ling 1519*3f9d6ad7SLin Ling switch (BP_GET_NDVAS(bp)) { 1520*3f9d6ad7SLin Ling case 2: 1521*3f9d6ad7SLin Ling if (DVA_GET_VDEV(&bp->blk_dva[0]) == 1522*3f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[1])) 1523*3f9d6ad7SLin Ling zb->zb_ditto_2_of_2_samevdev++; 1524*3f9d6ad7SLin Ling break; 1525*3f9d6ad7SLin Ling case 3: 1526*3f9d6ad7SLin Ling equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == 1527*3f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[1])) + 1528*3f9d6ad7SLin Ling (DVA_GET_VDEV(&bp->blk_dva[0]) == 1529*3f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[2])) + 1530*3f9d6ad7SLin Ling (DVA_GET_VDEV(&bp->blk_dva[1]) == 1531*3f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[2])); 1532*3f9d6ad7SLin Ling if (equal == 1) 1533*3f9d6ad7SLin Ling zb->zb_ditto_2_of_3_samevdev++; 1534*3f9d6ad7SLin Ling else if (equal == 3) 1535*3f9d6ad7SLin Ling zb->zb_ditto_3_of_3_samevdev++; 1536*3f9d6ad7SLin Ling break; 1537*3f9d6ad7SLin Ling } 1538*3f9d6ad7SLin Ling } 1539*3f9d6ad7SLin Ling } 1540*3f9d6ad7SLin Ling 1541*3f9d6ad7SLin Ling static void 1542*3f9d6ad7SLin Ling dsl_scan_scrub_done(zio_t *zio) 1543*3f9d6ad7SLin Ling { 1544*3f9d6ad7SLin Ling spa_t *spa = zio->io_spa; 1545*3f9d6ad7SLin Ling 1546*3f9d6ad7SLin Ling zio_data_buf_free(zio->io_data, zio->io_size); 1547*3f9d6ad7SLin Ling 1548*3f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 1549*3f9d6ad7SLin Ling spa->spa_scrub_inflight--; 1550*3f9d6ad7SLin Ling cv_broadcast(&spa->spa_scrub_io_cv); 1551*3f9d6ad7SLin Ling 1552*3f9d6ad7SLin Ling if (zio->io_error && (zio->io_error != ECKSUM || 1553*3f9d6ad7SLin Ling !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { 1554*3f9d6ad7SLin Ling spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++; 1555*3f9d6ad7SLin Ling } 1556*3f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 1557*3f9d6ad7SLin Ling } 1558*3f9d6ad7SLin Ling 1559*3f9d6ad7SLin Ling static int 1560*3f9d6ad7SLin Ling dsl_scan_scrub_cb(dsl_pool_t *dp, 1561*3f9d6ad7SLin Ling const blkptr_t *bp, const zbookmark_t *zb) 1562*3f9d6ad7SLin Ling { 1563*3f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 1564*3f9d6ad7SLin Ling size_t size = BP_GET_PSIZE(bp); 1565*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 1566*3f9d6ad7SLin Ling uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); 1567*3f9d6ad7SLin Ling boolean_t needs_io; 1568*3f9d6ad7SLin Ling int zio_flags = ZIO_FLAG_SCRUB_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; 1569*3f9d6ad7SLin Ling int zio_priority; 1570*3f9d6ad7SLin Ling 1571*3f9d6ad7SLin Ling if (phys_birth <= scn->scn_phys.scn_min_txg || 1572*3f9d6ad7SLin Ling phys_birth >= scn->scn_phys.scn_max_txg) 1573*3f9d6ad7SLin Ling return (0); 1574*3f9d6ad7SLin Ling 1575*3f9d6ad7SLin Ling count_block(dp->dp_blkstats, bp); 1576*3f9d6ad7SLin Ling 1577*3f9d6ad7SLin Ling ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); 1578*3f9d6ad7SLin Ling if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { 1579*3f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_SCRUB; 1580*3f9d6ad7SLin Ling zio_priority = ZIO_PRIORITY_SCRUB; 1581*3f9d6ad7SLin Ling needs_io = B_TRUE; 1582*3f9d6ad7SLin Ling } else if (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) { 1583*3f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_RESILVER; 1584*3f9d6ad7SLin Ling zio_priority = ZIO_PRIORITY_RESILVER; 1585*3f9d6ad7SLin Ling needs_io = B_FALSE; 1586*3f9d6ad7SLin Ling } 1587*3f9d6ad7SLin Ling 1588*3f9d6ad7SLin Ling /* If it's an intent log block, failure is expected. */ 1589*3f9d6ad7SLin Ling if (zb->zb_level == ZB_ZIL_LEVEL) 1590*3f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_SPECULATIVE; 1591*3f9d6ad7SLin Ling 1592*3f9d6ad7SLin Ling for (int d = 0; d < BP_GET_NDVAS(bp); d++) { 1593*3f9d6ad7SLin Ling vdev_t *vd = vdev_lookup_top(spa, 1594*3f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[d])); 1595*3f9d6ad7SLin Ling 1596*3f9d6ad7SLin Ling /* 1597*3f9d6ad7SLin Ling * Keep track of how much data we've examined so that 1598*3f9d6ad7SLin Ling * zpool(1M) status can make useful progress reports. 1599*3f9d6ad7SLin Ling */ 1600*3f9d6ad7SLin Ling scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]); 1601*3f9d6ad7SLin Ling spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]); 1602*3f9d6ad7SLin Ling 1603*3f9d6ad7SLin Ling /* if it's a resilver, this may not be in the target range */ 1604*3f9d6ad7SLin Ling if (!needs_io) { 1605*3f9d6ad7SLin Ling if (DVA_GET_GANG(&bp->blk_dva[d])) { 1606*3f9d6ad7SLin Ling /* 1607*3f9d6ad7SLin Ling * Gang members may be spread across multiple 1608*3f9d6ad7SLin Ling * vdevs, so the best estimate we have is the 1609*3f9d6ad7SLin Ling * scrub range, which has already been checked. 1610*3f9d6ad7SLin Ling * XXX -- it would be better to change our 1611*3f9d6ad7SLin Ling * allocation policy to ensure that all 1612*3f9d6ad7SLin Ling * gang members reside on the same vdev. 1613*3f9d6ad7SLin Ling */ 1614*3f9d6ad7SLin Ling needs_io = B_TRUE; 1615*3f9d6ad7SLin Ling } else { 1616*3f9d6ad7SLin Ling needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, 1617*3f9d6ad7SLin Ling phys_birth, 1); 1618*3f9d6ad7SLin Ling } 1619*3f9d6ad7SLin Ling } 1620*3f9d6ad7SLin Ling } 1621*3f9d6ad7SLin Ling 1622*3f9d6ad7SLin Ling if (needs_io && !zfs_no_scrub_io) { 1623*3f9d6ad7SLin Ling void *data = zio_data_buf_alloc(size); 1624*3f9d6ad7SLin Ling 1625*3f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 1626*3f9d6ad7SLin Ling while (spa->spa_scrub_inflight >= spa->spa_scrub_maxinflight) 1627*3f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1628*3f9d6ad7SLin Ling spa->spa_scrub_inflight++; 1629*3f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 1630*3f9d6ad7SLin Ling 1631*3f9d6ad7SLin Ling zio_nowait(zio_read(NULL, spa, bp, data, size, 1632*3f9d6ad7SLin Ling dsl_scan_scrub_done, NULL, zio_priority, 1633*3f9d6ad7SLin Ling zio_flags, zb)); 1634*3f9d6ad7SLin Ling } 1635*3f9d6ad7SLin Ling 1636*3f9d6ad7SLin Ling /* do not relocate this block */ 1637*3f9d6ad7SLin Ling return (0); 1638*3f9d6ad7SLin Ling } 1639*3f9d6ad7SLin Ling 1640*3f9d6ad7SLin Ling int 1641*3f9d6ad7SLin Ling dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) 1642*3f9d6ad7SLin Ling { 1643*3f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 1644*3f9d6ad7SLin Ling 1645*3f9d6ad7SLin Ling /* 1646*3f9d6ad7SLin Ling * Purge all vdev caches and probe all devices. We do this here 1647*3f9d6ad7SLin Ling * rather than in sync context because this requires a writer lock 1648*3f9d6ad7SLin Ling * on the spa_config lock, which we can't do from sync context. The 1649*3f9d6ad7SLin Ling * spa_scrub_reopen flag indicates that vdev_open() should not 1650*3f9d6ad7SLin Ling * attempt to start another scrub. 1651*3f9d6ad7SLin Ling */ 1652*3f9d6ad7SLin Ling spa_vdev_state_enter(spa, SCL_NONE); 1653*3f9d6ad7SLin Ling spa->spa_scrub_reopen = B_TRUE; 1654*3f9d6ad7SLin Ling vdev_reopen(spa->spa_root_vdev); 1655*3f9d6ad7SLin Ling spa->spa_scrub_reopen = B_FALSE; 1656*3f9d6ad7SLin Ling (void) spa_vdev_state_exit(spa, NULL, 0); 1657*3f9d6ad7SLin Ling 1658*3f9d6ad7SLin Ling return (dsl_sync_task_do(dp, dsl_scan_setup_check, 1659*3f9d6ad7SLin Ling dsl_scan_setup_sync, dp->dp_scan, &func, 0)); 1660*3f9d6ad7SLin Ling } 1661