13f9d6ad7SLin Ling /* 23f9d6ad7SLin Ling * CDDL HEADER START 33f9d6ad7SLin Ling * 43f9d6ad7SLin Ling * The contents of this file are subject to the terms of the 53f9d6ad7SLin Ling * Common Development and Distribution License (the "License"). 63f9d6ad7SLin Ling * You may not use this file except in compliance with the License. 73f9d6ad7SLin Ling * 83f9d6ad7SLin Ling * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 93f9d6ad7SLin Ling * or http://www.opensolaris.org/os/licensing. 103f9d6ad7SLin Ling * See the License for the specific language governing permissions 113f9d6ad7SLin Ling * and limitations under the License. 123f9d6ad7SLin Ling * 133f9d6ad7SLin Ling * When distributing Covered Code, include this CDDL HEADER in each 143f9d6ad7SLin Ling * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 153f9d6ad7SLin Ling * If applicable, add the following below this CDDL HEADER, with the 163f9d6ad7SLin Ling * fields enclosed by brackets "[]" replaced with your own identifying 173f9d6ad7SLin Ling * information: Portions Copyright [yyyy] [name of copyright owner] 183f9d6ad7SLin Ling * 193f9d6ad7SLin Ling * CDDL HEADER END 203f9d6ad7SLin Ling */ 213f9d6ad7SLin Ling /* 223f9d6ad7SLin Ling * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 23*7802d7bfSMatthew Ahrens * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 243f9d6ad7SLin Ling */ 253f9d6ad7SLin Ling 263f9d6ad7SLin Ling #include <sys/dsl_scan.h> 273f9d6ad7SLin Ling #include <sys/dsl_pool.h> 283f9d6ad7SLin Ling #include <sys/dsl_dataset.h> 293f9d6ad7SLin Ling #include <sys/dsl_prop.h> 303f9d6ad7SLin Ling #include <sys/dsl_dir.h> 313f9d6ad7SLin Ling #include <sys/dsl_synctask.h> 323f9d6ad7SLin Ling #include <sys/dnode.h> 333f9d6ad7SLin Ling #include <sys/dmu_tx.h> 343f9d6ad7SLin Ling #include <sys/dmu_objset.h> 353f9d6ad7SLin Ling #include <sys/arc.h> 363f9d6ad7SLin Ling #include <sys/zap.h> 373f9d6ad7SLin Ling #include <sys/zio.h> 383f9d6ad7SLin Ling #include <sys/zfs_context.h> 393f9d6ad7SLin Ling #include <sys/fs/zfs.h> 403f9d6ad7SLin Ling #include <sys/zfs_znode.h> 413f9d6ad7SLin Ling #include <sys/spa_impl.h> 423f9d6ad7SLin Ling #include <sys/vdev_impl.h> 433f9d6ad7SLin Ling #include <sys/zil_impl.h> 443f9d6ad7SLin Ling #include <sys/zio_checksum.h> 453f9d6ad7SLin Ling #include <sys/ddt.h> 463f9d6ad7SLin Ling #include <sys/sa.h> 473f9d6ad7SLin Ling #include <sys/sa_impl.h> 48ad135b5dSChristopher Siden #include <sys/zfeature.h> 493f9d6ad7SLin Ling #ifdef _KERNEL 503f9d6ad7SLin Ling #include <sys/zfs_vfsops.h> 513f9d6ad7SLin Ling #endif 523f9d6ad7SLin Ling 53*7802d7bfSMatthew Ahrens typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, 54*7802d7bfSMatthew Ahrens const zbookmark_phys_t *); 553f9d6ad7SLin Ling 563f9d6ad7SLin Ling static scan_cb_t dsl_scan_scrub_cb; 573b2aab18SMatthew Ahrens static void dsl_scan_cancel_sync(void *, dmu_tx_t *); 583f9d6ad7SLin Ling static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *tx); 593f9d6ad7SLin Ling 6044ecc532SGeorge Wilson int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */ 6144ecc532SGeorge Wilson int zfs_resilver_delay = 2; /* number of ticks to delay resilver */ 6244ecc532SGeorge Wilson int zfs_scrub_delay = 4; /* number of ticks to delay scrub */ 6344ecc532SGeorge Wilson int zfs_scan_idle = 50; /* idle window in clock ticks */ 6444ecc532SGeorge Wilson 653f9d6ad7SLin Ling int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */ 66cde58dbcSMatthew Ahrens int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */ 673f9d6ad7SLin Ling int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ 683f9d6ad7SLin Ling boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ 697fd05ac4SMatthew Ahrens boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable scrub prefetch */ 703f9d6ad7SLin Ling enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; 713f9d6ad7SLin Ling int dsl_scan_delay_completion = B_FALSE; /* set to delay scan completion */ 723f9d6ad7SLin Ling 733f9d6ad7SLin Ling #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ 743f9d6ad7SLin Ling ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ 753f9d6ad7SLin Ling (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) 763f9d6ad7SLin Ling 773f9d6ad7SLin Ling extern int zfs_txg_timeout; 783f9d6ad7SLin Ling 793f9d6ad7SLin Ling /* the order has to match pool_scan_type */ 803f9d6ad7SLin Ling static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { 813f9d6ad7SLin Ling NULL, 823f9d6ad7SLin Ling dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ 833f9d6ad7SLin Ling dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ 843f9d6ad7SLin Ling }; 853f9d6ad7SLin Ling 863f9d6ad7SLin Ling int 873f9d6ad7SLin Ling dsl_scan_init(dsl_pool_t *dp, uint64_t txg) 883f9d6ad7SLin Ling { 893f9d6ad7SLin Ling int err; 903f9d6ad7SLin Ling dsl_scan_t *scn; 913f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 923f9d6ad7SLin Ling uint64_t f; 933f9d6ad7SLin Ling 943f9d6ad7SLin Ling scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); 953f9d6ad7SLin Ling scn->scn_dp = dp; 963f9d6ad7SLin Ling 974a923759SGeorge Wilson /* 984a923759SGeorge Wilson * It's possible that we're resuming a scan after a reboot so 994a923759SGeorge Wilson * make sure that the scan_async_destroying flag is initialized 1004a923759SGeorge Wilson * appropriately. 1014a923759SGeorge Wilson */ 1024a923759SGeorge Wilson ASSERT(!scn->scn_async_destroying); 1034a923759SGeorge Wilson scn->scn_async_destroying = spa_feature_is_active(dp->dp_spa, 1042acef22dSMatthew Ahrens SPA_FEATURE_ASYNC_DESTROY); 1054a923759SGeorge Wilson 1063f9d6ad7SLin Ling err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 1073f9d6ad7SLin Ling "scrub_func", sizeof (uint64_t), 1, &f); 1083f9d6ad7SLin Ling if (err == 0) { 1093f9d6ad7SLin Ling /* 1103f9d6ad7SLin Ling * There was an old-style scrub in progress. Restart a 1113f9d6ad7SLin Ling * new-style scrub from the beginning. 1123f9d6ad7SLin Ling */ 1133f9d6ad7SLin Ling scn->scn_restart_txg = txg; 1143f9d6ad7SLin Ling zfs_dbgmsg("old-style scrub was in progress; " 1153f9d6ad7SLin Ling "restarting new-style scrub in txg %llu", 1163f9d6ad7SLin Ling scn->scn_restart_txg); 1173f9d6ad7SLin Ling 1183f9d6ad7SLin Ling /* 1193f9d6ad7SLin Ling * Load the queue obj from the old location so that it 1203f9d6ad7SLin Ling * can be freed by dsl_scan_done(). 1213f9d6ad7SLin Ling */ 1223f9d6ad7SLin Ling (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 1233f9d6ad7SLin Ling "scrub_queue", sizeof (uint64_t), 1, 1243f9d6ad7SLin Ling &scn->scn_phys.scn_queue_obj); 1253f9d6ad7SLin Ling } else { 1263f9d6ad7SLin Ling err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 1273f9d6ad7SLin Ling DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, 1283f9d6ad7SLin Ling &scn->scn_phys); 1293f9d6ad7SLin Ling if (err == ENOENT) 1303f9d6ad7SLin Ling return (0); 1313f9d6ad7SLin Ling else if (err) 1323f9d6ad7SLin Ling return (err); 1333f9d6ad7SLin Ling 1343f9d6ad7SLin Ling if (scn->scn_phys.scn_state == DSS_SCANNING && 1353f9d6ad7SLin Ling spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { 1363f9d6ad7SLin Ling /* 1373f9d6ad7SLin Ling * A new-type scrub was in progress on an old 1383f9d6ad7SLin Ling * pool, and the pool was accessed by old 1393f9d6ad7SLin Ling * software. Restart from the beginning, since 1403f9d6ad7SLin Ling * the old software may have changed the pool in 1413f9d6ad7SLin Ling * the meantime. 1423f9d6ad7SLin Ling */ 1433f9d6ad7SLin Ling scn->scn_restart_txg = txg; 1443f9d6ad7SLin Ling zfs_dbgmsg("new-style scrub was modified " 1453f9d6ad7SLin Ling "by old software; restarting in txg %llu", 1463f9d6ad7SLin Ling scn->scn_restart_txg); 1473f9d6ad7SLin Ling } 1483f9d6ad7SLin Ling } 1493f9d6ad7SLin Ling 1503f9d6ad7SLin Ling spa_scan_stat_init(spa); 1513f9d6ad7SLin Ling return (0); 1523f9d6ad7SLin Ling } 1533f9d6ad7SLin Ling 1543f9d6ad7SLin Ling void 1553f9d6ad7SLin Ling dsl_scan_fini(dsl_pool_t *dp) 1563f9d6ad7SLin Ling { 1573f9d6ad7SLin Ling if (dp->dp_scan) { 1583f9d6ad7SLin Ling kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); 1593f9d6ad7SLin Ling dp->dp_scan = NULL; 1603f9d6ad7SLin Ling } 1613f9d6ad7SLin Ling } 1623f9d6ad7SLin Ling 1633f9d6ad7SLin Ling /* ARGSUSED */ 1643f9d6ad7SLin Ling static int 1653b2aab18SMatthew Ahrens dsl_scan_setup_check(void *arg, dmu_tx_t *tx) 1663f9d6ad7SLin Ling { 1673b2aab18SMatthew Ahrens dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; 1683f9d6ad7SLin Ling 1693f9d6ad7SLin Ling if (scn->scn_phys.scn_state == DSS_SCANNING) 170be6fd75aSMatthew Ahrens return (SET_ERROR(EBUSY)); 1713f9d6ad7SLin Ling 1723f9d6ad7SLin Ling return (0); 1733f9d6ad7SLin Ling } 1743f9d6ad7SLin Ling 1753f9d6ad7SLin Ling static void 1763b2aab18SMatthew Ahrens dsl_scan_setup_sync(void *arg, dmu_tx_t *tx) 1773f9d6ad7SLin Ling { 1783b2aab18SMatthew Ahrens dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; 1793b2aab18SMatthew Ahrens pool_scan_func_t *funcp = arg; 1803f9d6ad7SLin Ling dmu_object_type_t ot = 0; 1813f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 1823f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 1833f9d6ad7SLin Ling 1843f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_state != DSS_SCANNING); 1853f9d6ad7SLin Ling ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); 1863f9d6ad7SLin Ling bzero(&scn->scn_phys, sizeof (scn->scn_phys)); 1873f9d6ad7SLin Ling scn->scn_phys.scn_func = *funcp; 1883f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_SCANNING; 1893f9d6ad7SLin Ling scn->scn_phys.scn_min_txg = 0; 1903f9d6ad7SLin Ling scn->scn_phys.scn_max_txg = tx->tx_txg; 1913f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ 1923f9d6ad7SLin Ling scn->scn_phys.scn_start_time = gethrestime_sec(); 1933f9d6ad7SLin Ling scn->scn_phys.scn_errors = 0; 1943f9d6ad7SLin Ling scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; 1953f9d6ad7SLin Ling scn->scn_restart_txg = 0; 196b4952e17SGeorge Wilson scn->scn_done_txg = 0; 1973f9d6ad7SLin Ling spa_scan_stat_init(spa); 1983f9d6ad7SLin Ling 1993f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 2003f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; 2013f9d6ad7SLin Ling 2023f9d6ad7SLin Ling /* rewrite all disk labels */ 2033f9d6ad7SLin Ling vdev_config_dirty(spa->spa_root_vdev); 2043f9d6ad7SLin Ling 2053f9d6ad7SLin Ling if (vdev_resilver_needed(spa->spa_root_vdev, 2063f9d6ad7SLin Ling &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { 2073f9d6ad7SLin Ling spa_event_notify(spa, NULL, ESC_ZFS_RESILVER_START); 2083f9d6ad7SLin Ling } else { 2093f9d6ad7SLin Ling spa_event_notify(spa, NULL, ESC_ZFS_SCRUB_START); 2103f9d6ad7SLin Ling } 2113f9d6ad7SLin Ling 2123f9d6ad7SLin Ling spa->spa_scrub_started = B_TRUE; 2133f9d6ad7SLin Ling /* 2143f9d6ad7SLin Ling * If this is an incremental scrub, limit the DDT scrub phase 2153f9d6ad7SLin Ling * to just the auto-ditto class (for correctness); the rest 2163f9d6ad7SLin Ling * of the scrub should go faster using top-down pruning. 2173f9d6ad7SLin Ling */ 2183f9d6ad7SLin Ling if (scn->scn_phys.scn_min_txg > TXG_INITIAL) 2193f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; 2203f9d6ad7SLin Ling 2213f9d6ad7SLin Ling } 2223f9d6ad7SLin Ling 2233f9d6ad7SLin Ling /* back to the generic stuff */ 2243f9d6ad7SLin Ling 2253f9d6ad7SLin Ling if (dp->dp_blkstats == NULL) { 2263f9d6ad7SLin Ling dp->dp_blkstats = 2273f9d6ad7SLin Ling kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); 2283f9d6ad7SLin Ling } 2293f9d6ad7SLin Ling bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); 2303f9d6ad7SLin Ling 2313f9d6ad7SLin Ling if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) 2323f9d6ad7SLin Ling ot = DMU_OT_ZAP_OTHER; 2333f9d6ad7SLin Ling 2343f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, 2353f9d6ad7SLin Ling ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); 2363f9d6ad7SLin Ling 2373f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 2383f9d6ad7SLin Ling 2394445fffbSMatthew Ahrens spa_history_log_internal(spa, "scan setup", tx, 2403f9d6ad7SLin Ling "func=%u mintxg=%llu maxtxg=%llu", 2413f9d6ad7SLin Ling *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg); 2423f9d6ad7SLin Ling } 2433f9d6ad7SLin Ling 2443f9d6ad7SLin Ling /* ARGSUSED */ 2453f9d6ad7SLin Ling static void 2463f9d6ad7SLin Ling dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) 2473f9d6ad7SLin Ling { 2483f9d6ad7SLin Ling static const char *old_names[] = { 2493f9d6ad7SLin Ling "scrub_bookmark", 2503f9d6ad7SLin Ling "scrub_ddt_bookmark", 2513f9d6ad7SLin Ling "scrub_ddt_class_max", 2523f9d6ad7SLin Ling "scrub_queue", 2533f9d6ad7SLin Ling "scrub_min_txg", 2543f9d6ad7SLin Ling "scrub_max_txg", 2553f9d6ad7SLin Ling "scrub_func", 2563f9d6ad7SLin Ling "scrub_errors", 2573f9d6ad7SLin Ling NULL 2583f9d6ad7SLin Ling }; 2593f9d6ad7SLin Ling 2603f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 2613f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 2623f9d6ad7SLin Ling int i; 2633f9d6ad7SLin Ling 2643f9d6ad7SLin Ling /* Remove any remnants of an old-style scrub. */ 2653f9d6ad7SLin Ling for (i = 0; old_names[i]; i++) { 2663f9d6ad7SLin Ling (void) zap_remove(dp->dp_meta_objset, 2673f9d6ad7SLin Ling DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); 2683f9d6ad7SLin Ling } 2693f9d6ad7SLin Ling 2703f9d6ad7SLin Ling if (scn->scn_phys.scn_queue_obj != 0) { 2713f9d6ad7SLin Ling VERIFY(0 == dmu_object_free(dp->dp_meta_objset, 2723f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, tx)); 2733f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj = 0; 2743f9d6ad7SLin Ling } 2753f9d6ad7SLin Ling 2763f9d6ad7SLin Ling /* 2773f9d6ad7SLin Ling * If we were "restarted" from a stopped state, don't bother 2783f9d6ad7SLin Ling * with anything else. 2793f9d6ad7SLin Ling */ 2803f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 2813f9d6ad7SLin Ling return; 2823f9d6ad7SLin Ling 2833f9d6ad7SLin Ling if (complete) 2843f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_FINISHED; 2853f9d6ad7SLin Ling else 2863f9d6ad7SLin Ling scn->scn_phys.scn_state = DSS_CANCELED; 2873f9d6ad7SLin Ling 2884445fffbSMatthew Ahrens spa_history_log_internal(spa, "scan done", tx, 2893f9d6ad7SLin Ling "complete=%u", complete); 2903f9d6ad7SLin Ling 2913f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 2923f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 2933f9d6ad7SLin Ling while (spa->spa_scrub_inflight > 0) { 2943f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, 2953f9d6ad7SLin Ling &spa->spa_scrub_lock); 2963f9d6ad7SLin Ling } 2973f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 2983f9d6ad7SLin Ling spa->spa_scrub_started = B_FALSE; 2993f9d6ad7SLin Ling spa->spa_scrub_active = B_FALSE; 3003f9d6ad7SLin Ling 3013f9d6ad7SLin Ling /* 3023f9d6ad7SLin Ling * If the scrub/resilver completed, update all DTLs to 3033f9d6ad7SLin Ling * reflect this. Whether it succeeded or not, vacate 3043f9d6ad7SLin Ling * all temporary scrub DTLs. 3053f9d6ad7SLin Ling */ 3063f9d6ad7SLin Ling vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, 3073f9d6ad7SLin Ling complete ? scn->scn_phys.scn_max_txg : 0, B_TRUE); 3083f9d6ad7SLin Ling if (complete) { 3093f9d6ad7SLin Ling spa_event_notify(spa, NULL, scn->scn_phys.scn_min_txg ? 3103f9d6ad7SLin Ling ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH); 3113f9d6ad7SLin Ling } 3123f9d6ad7SLin Ling spa_errlog_rotate(spa); 3133f9d6ad7SLin Ling 3143f9d6ad7SLin Ling /* 3153f9d6ad7SLin Ling * We may have finished replacing a device. 3163f9d6ad7SLin Ling * Let the async thread assess this and handle the detach. 3173f9d6ad7SLin Ling */ 3183f9d6ad7SLin Ling spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 3193f9d6ad7SLin Ling } 3203f9d6ad7SLin Ling 3213f9d6ad7SLin Ling scn->scn_phys.scn_end_time = gethrestime_sec(); 3223f9d6ad7SLin Ling } 3233f9d6ad7SLin Ling 3243f9d6ad7SLin Ling /* ARGSUSED */ 3253f9d6ad7SLin Ling static int 3263b2aab18SMatthew Ahrens dsl_scan_cancel_check(void *arg, dmu_tx_t *tx) 3273f9d6ad7SLin Ling { 3283b2aab18SMatthew Ahrens dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; 3293f9d6ad7SLin Ling 3303f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 331be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 3323f9d6ad7SLin Ling return (0); 3333f9d6ad7SLin Ling } 3343f9d6ad7SLin Ling 3353f9d6ad7SLin Ling /* ARGSUSED */ 3363f9d6ad7SLin Ling static void 3373b2aab18SMatthew Ahrens dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx) 3383f9d6ad7SLin Ling { 3393b2aab18SMatthew Ahrens dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; 3403f9d6ad7SLin Ling 3413f9d6ad7SLin Ling dsl_scan_done(scn, B_FALSE, tx); 3423f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 3433f9d6ad7SLin Ling } 3443f9d6ad7SLin Ling 3453f9d6ad7SLin Ling int 3463f9d6ad7SLin Ling dsl_scan_cancel(dsl_pool_t *dp) 3473f9d6ad7SLin Ling { 3483b2aab18SMatthew Ahrens return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check, 3493b2aab18SMatthew Ahrens dsl_scan_cancel_sync, NULL, 3)); 3503f9d6ad7SLin Ling } 3513f9d6ad7SLin Ling 3523f9d6ad7SLin Ling static void dsl_scan_visitbp(blkptr_t *bp, 353*7802d7bfSMatthew Ahrens const zbookmark_phys_t *zb, dnode_phys_t *dnp, arc_buf_t *pbuf, 3543f9d6ad7SLin Ling dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, 3553f9d6ad7SLin Ling dmu_tx_t *tx); 3563f9d6ad7SLin Ling static void dsl_scan_visitdnode(dsl_scan_t *, dsl_dataset_t *ds, 3573f9d6ad7SLin Ling dmu_objset_type_t ostype, 3583f9d6ad7SLin Ling dnode_phys_t *dnp, arc_buf_t *buf, uint64_t object, dmu_tx_t *tx); 3593f9d6ad7SLin Ling 3603f9d6ad7SLin Ling void 3613f9d6ad7SLin Ling dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) 3623f9d6ad7SLin Ling { 3633f9d6ad7SLin Ling zio_free(dp->dp_spa, txg, bp); 3643f9d6ad7SLin Ling } 3653f9d6ad7SLin Ling 3663f9d6ad7SLin Ling void 3673f9d6ad7SLin Ling dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) 3683f9d6ad7SLin Ling { 3693f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dp)); 3703f9d6ad7SLin Ling zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); 3713f9d6ad7SLin Ling } 3723f9d6ad7SLin Ling 3733f9d6ad7SLin Ling static uint64_t 3743f9d6ad7SLin Ling dsl_scan_ds_maxtxg(dsl_dataset_t *ds) 3753f9d6ad7SLin Ling { 3763f9d6ad7SLin Ling uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; 3773f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) 3783f9d6ad7SLin Ling return (MIN(smt, ds->ds_phys->ds_creation_txg)); 3793f9d6ad7SLin Ling return (smt); 3803f9d6ad7SLin Ling } 3813f9d6ad7SLin Ling 3823f9d6ad7SLin Ling static void 3833f9d6ad7SLin Ling dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) 3843f9d6ad7SLin Ling { 3853b2aab18SMatthew Ahrens VERIFY0(zap_update(scn->scn_dp->dp_meta_objset, 3863f9d6ad7SLin Ling DMU_POOL_DIRECTORY_OBJECT, 3873f9d6ad7SLin Ling DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, 3883f9d6ad7SLin Ling &scn->scn_phys, tx)); 3893f9d6ad7SLin Ling } 3903f9d6ad7SLin Ling 3913f9d6ad7SLin Ling static boolean_t 392*7802d7bfSMatthew Ahrens dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_phys_t *zb) 3933f9d6ad7SLin Ling { 3943f9d6ad7SLin Ling uint64_t elapsed_nanosecs; 3953f9d6ad7SLin Ling int mintime; 3963f9d6ad7SLin Ling 3973f9d6ad7SLin Ling /* we never skip user/group accounting objects */ 3983f9d6ad7SLin Ling if (zb && (int64_t)zb->zb_object < 0) 3993f9d6ad7SLin Ling return (B_FALSE); 4003f9d6ad7SLin Ling 4013f9d6ad7SLin Ling if (scn->scn_pausing) 4023f9d6ad7SLin Ling return (B_TRUE); /* we're already pausing */ 4033f9d6ad7SLin Ling 404ad135b5dSChristopher Siden if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) 4053f9d6ad7SLin Ling return (B_FALSE); /* we're resuming */ 4063f9d6ad7SLin Ling 4073f9d6ad7SLin Ling /* We only know how to resume from level-0 blocks. */ 4083f9d6ad7SLin Ling if (zb && zb->zb_level != 0) 4093f9d6ad7SLin Ling return (B_FALSE); 4103f9d6ad7SLin Ling 4113f9d6ad7SLin Ling mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? 4123f9d6ad7SLin Ling zfs_resilver_min_time_ms : zfs_scan_min_time_ms; 4133f9d6ad7SLin Ling elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; 4143f9d6ad7SLin Ling if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || 4150689f76cSAdam Leventhal (NSEC2MSEC(elapsed_nanosecs) > mintime && 4163f9d6ad7SLin Ling txg_sync_waiting(scn->scn_dp)) || 4173f9d6ad7SLin Ling spa_shutting_down(scn->scn_dp->dp_spa)) { 4183f9d6ad7SLin Ling if (zb) { 4193f9d6ad7SLin Ling dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", 4203f9d6ad7SLin Ling (longlong_t)zb->zb_objset, 4213f9d6ad7SLin Ling (longlong_t)zb->zb_object, 4223f9d6ad7SLin Ling (longlong_t)zb->zb_level, 4233f9d6ad7SLin Ling (longlong_t)zb->zb_blkid); 4243f9d6ad7SLin Ling scn->scn_phys.scn_bookmark = *zb; 4253f9d6ad7SLin Ling } 4263f9d6ad7SLin Ling dprintf("pausing at DDT bookmark %llx/%llx/%llx/%llx\n", 4273f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, 4283f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, 4293f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, 4303f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); 4313f9d6ad7SLin Ling scn->scn_pausing = B_TRUE; 4323f9d6ad7SLin Ling return (B_TRUE); 4333f9d6ad7SLin Ling } 4343f9d6ad7SLin Ling return (B_FALSE); 4353f9d6ad7SLin Ling } 4363f9d6ad7SLin Ling 4373f9d6ad7SLin Ling typedef struct zil_scan_arg { 4383f9d6ad7SLin Ling dsl_pool_t *zsa_dp; 4393f9d6ad7SLin Ling zil_header_t *zsa_zh; 4403f9d6ad7SLin Ling } zil_scan_arg_t; 4413f9d6ad7SLin Ling 4423f9d6ad7SLin Ling /* ARGSUSED */ 4433f9d6ad7SLin Ling static int 4443f9d6ad7SLin Ling dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) 4453f9d6ad7SLin Ling { 4463f9d6ad7SLin Ling zil_scan_arg_t *zsa = arg; 4473f9d6ad7SLin Ling dsl_pool_t *dp = zsa->zsa_dp; 4483f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 4493f9d6ad7SLin Ling zil_header_t *zh = zsa->zsa_zh; 450*7802d7bfSMatthew Ahrens zbookmark_phys_t zb; 4513f9d6ad7SLin Ling 45243466aaeSMax Grossman if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 4533f9d6ad7SLin Ling return (0); 4543f9d6ad7SLin Ling 4553f9d6ad7SLin Ling /* 4563f9d6ad7SLin Ling * One block ("stubby") can be allocated a long time ago; we 4573f9d6ad7SLin Ling * want to visit that one because it has been allocated 4583f9d6ad7SLin Ling * (on-disk) even if it hasn't been claimed (even though for 4593f9d6ad7SLin Ling * scrub there's nothing to do to it). 4603f9d6ad7SLin Ling */ 4613f9d6ad7SLin Ling if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) 4623f9d6ad7SLin Ling return (0); 4633f9d6ad7SLin Ling 4643f9d6ad7SLin Ling SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], 4653f9d6ad7SLin Ling ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); 4663f9d6ad7SLin Ling 4673f9d6ad7SLin Ling VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); 4683f9d6ad7SLin Ling return (0); 4693f9d6ad7SLin Ling } 4703f9d6ad7SLin Ling 4713f9d6ad7SLin Ling /* ARGSUSED */ 4723f9d6ad7SLin Ling static int 4733f9d6ad7SLin Ling dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) 4743f9d6ad7SLin Ling { 4753f9d6ad7SLin Ling if (lrc->lrc_txtype == TX_WRITE) { 4763f9d6ad7SLin Ling zil_scan_arg_t *zsa = arg; 4773f9d6ad7SLin Ling dsl_pool_t *dp = zsa->zsa_dp; 4783f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 4793f9d6ad7SLin Ling zil_header_t *zh = zsa->zsa_zh; 4803f9d6ad7SLin Ling lr_write_t *lr = (lr_write_t *)lrc; 4813f9d6ad7SLin Ling blkptr_t *bp = &lr->lr_blkptr; 482*7802d7bfSMatthew Ahrens zbookmark_phys_t zb; 4833f9d6ad7SLin Ling 48443466aaeSMax Grossman if (BP_IS_HOLE(bp) || 48543466aaeSMax Grossman bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 4863f9d6ad7SLin Ling return (0); 4873f9d6ad7SLin Ling 4883f9d6ad7SLin Ling /* 4893f9d6ad7SLin Ling * birth can be < claim_txg if this record's txg is 4903f9d6ad7SLin Ling * already txg sync'ed (but this log block contains 4913f9d6ad7SLin Ling * other records that are not synced) 4923f9d6ad7SLin Ling */ 4933f9d6ad7SLin Ling if (claim_txg == 0 || bp->blk_birth < claim_txg) 4943f9d6ad7SLin Ling return (0); 4953f9d6ad7SLin Ling 4963f9d6ad7SLin Ling SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], 4973f9d6ad7SLin Ling lr->lr_foid, ZB_ZIL_LEVEL, 4983f9d6ad7SLin Ling lr->lr_offset / BP_GET_LSIZE(bp)); 4993f9d6ad7SLin Ling 5003f9d6ad7SLin Ling VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); 5013f9d6ad7SLin Ling } 5023f9d6ad7SLin Ling return (0); 5033f9d6ad7SLin Ling } 5043f9d6ad7SLin Ling 5053f9d6ad7SLin Ling static void 5063f9d6ad7SLin Ling dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) 5073f9d6ad7SLin Ling { 5083f9d6ad7SLin Ling uint64_t claim_txg = zh->zh_claim_txg; 5093f9d6ad7SLin Ling zil_scan_arg_t zsa = { dp, zh }; 5103f9d6ad7SLin Ling zilog_t *zilog; 5113f9d6ad7SLin Ling 5123f9d6ad7SLin Ling /* 5133f9d6ad7SLin Ling * We only want to visit blocks that have been claimed but not yet 5143f9d6ad7SLin Ling * replayed (or, in read-only mode, blocks that *would* be claimed). 5153f9d6ad7SLin Ling */ 5163f9d6ad7SLin Ling if (claim_txg == 0 && spa_writeable(dp->dp_spa)) 5173f9d6ad7SLin Ling return; 5183f9d6ad7SLin Ling 5193f9d6ad7SLin Ling zilog = zil_alloc(dp->dp_meta_objset, zh); 5203f9d6ad7SLin Ling 5213f9d6ad7SLin Ling (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, 5223f9d6ad7SLin Ling claim_txg); 5233f9d6ad7SLin Ling 5243f9d6ad7SLin Ling zil_free(zilog); 5253f9d6ad7SLin Ling } 5263f9d6ad7SLin Ling 5273f9d6ad7SLin Ling /* ARGSUSED */ 5283f9d6ad7SLin Ling static void 5293f9d6ad7SLin Ling dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp, 5303f9d6ad7SLin Ling uint64_t objset, uint64_t object, uint64_t blkid) 5313f9d6ad7SLin Ling { 532*7802d7bfSMatthew Ahrens zbookmark_phys_t czb; 5333f9d6ad7SLin Ling uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; 5343f9d6ad7SLin Ling 5353f9d6ad7SLin Ling if (zfs_no_scrub_prefetch) 5363f9d6ad7SLin Ling return; 5373f9d6ad7SLin Ling 5383f9d6ad7SLin Ling if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg || 5393f9d6ad7SLin Ling (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE)) 5403f9d6ad7SLin Ling return; 5413f9d6ad7SLin Ling 5423f9d6ad7SLin Ling SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid); 5433f9d6ad7SLin Ling 544cde58dbcSMatthew Ahrens (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp, 5451b912ec7SGeorge Wilson NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 54644ecc532SGeorge Wilson ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD, &flags, &czb); 5473f9d6ad7SLin Ling } 5483f9d6ad7SLin Ling 5493f9d6ad7SLin Ling static boolean_t 5503f9d6ad7SLin Ling dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, 551*7802d7bfSMatthew Ahrens const zbookmark_phys_t *zb) 5523f9d6ad7SLin Ling { 5533f9d6ad7SLin Ling /* 5543f9d6ad7SLin Ling * We never skip over user/group accounting objects (obj<0) 5553f9d6ad7SLin Ling */ 556ad135b5dSChristopher Siden if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) && 5573f9d6ad7SLin Ling (int64_t)zb->zb_object >= 0) { 5583f9d6ad7SLin Ling /* 5593f9d6ad7SLin Ling * If we already visited this bp & everything below (in 5603f9d6ad7SLin Ling * a prior txg sync), don't bother doing it again. 5613f9d6ad7SLin Ling */ 562ad135b5dSChristopher Siden if (zbookmark_is_before(dnp, zb, &scn->scn_phys.scn_bookmark)) 5633f9d6ad7SLin Ling return (B_TRUE); 5643f9d6ad7SLin Ling 5653f9d6ad7SLin Ling /* 5663f9d6ad7SLin Ling * If we found the block we're trying to resume from, or 5673f9d6ad7SLin Ling * we went past it to a different object, zero it out to 5683f9d6ad7SLin Ling * indicate that it's OK to start checking for pausing 5693f9d6ad7SLin Ling * again. 5703f9d6ad7SLin Ling */ 5713f9d6ad7SLin Ling if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || 5723f9d6ad7SLin Ling zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { 5733f9d6ad7SLin Ling dprintf("resuming at %llx/%llx/%llx/%llx\n", 5743f9d6ad7SLin Ling (longlong_t)zb->zb_objset, 5753f9d6ad7SLin Ling (longlong_t)zb->zb_object, 5763f9d6ad7SLin Ling (longlong_t)zb->zb_level, 5773f9d6ad7SLin Ling (longlong_t)zb->zb_blkid); 5783f9d6ad7SLin Ling bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); 5793f9d6ad7SLin Ling } 5803f9d6ad7SLin Ling } 5813f9d6ad7SLin Ling return (B_FALSE); 5823f9d6ad7SLin Ling } 5833f9d6ad7SLin Ling 5843f9d6ad7SLin Ling /* 5853f9d6ad7SLin Ling * Return nonzero on i/o error. 5863f9d6ad7SLin Ling * Return new buf to write out in *bufp. 5873f9d6ad7SLin Ling */ 5883f9d6ad7SLin Ling static int 5893f9d6ad7SLin Ling dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, 5903f9d6ad7SLin Ling dnode_phys_t *dnp, const blkptr_t *bp, 591*7802d7bfSMatthew Ahrens const zbookmark_phys_t *zb, dmu_tx_t *tx, arc_buf_t **bufp) 5923f9d6ad7SLin Ling { 5933f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 59444ecc532SGeorge Wilson int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD; 5953f9d6ad7SLin Ling int err; 5963f9d6ad7SLin Ling 5973f9d6ad7SLin Ling if (BP_GET_LEVEL(bp) > 0) { 5983f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 5993f9d6ad7SLin Ling int i; 6003f9d6ad7SLin Ling blkptr_t *cbp; 6013f9d6ad7SLin Ling int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; 6023f9d6ad7SLin Ling 6031b912ec7SGeorge Wilson err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, 60444ecc532SGeorge Wilson ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 6053f9d6ad7SLin Ling if (err) { 6063f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 6073f9d6ad7SLin Ling return (err); 6083f9d6ad7SLin Ling } 6093f9d6ad7SLin Ling for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { 6103f9d6ad7SLin Ling dsl_scan_prefetch(scn, *bufp, cbp, zb->zb_objset, 6113f9d6ad7SLin Ling zb->zb_object, zb->zb_blkid * epb + i); 6123f9d6ad7SLin Ling } 6133f9d6ad7SLin Ling for (i = 0, cbp = (*bufp)->b_data; i < epb; i++, cbp++) { 614*7802d7bfSMatthew Ahrens zbookmark_phys_t czb; 6153f9d6ad7SLin Ling 6163f9d6ad7SLin Ling SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, 6173f9d6ad7SLin Ling zb->zb_level - 1, 6183f9d6ad7SLin Ling zb->zb_blkid * epb + i); 6193f9d6ad7SLin Ling dsl_scan_visitbp(cbp, &czb, dnp, 6203f9d6ad7SLin Ling *bufp, ds, scn, ostype, tx); 6213f9d6ad7SLin Ling } 6223f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_USERGROUP_USED) { 6233f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 6243f9d6ad7SLin Ling 6251b912ec7SGeorge Wilson err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, 62644ecc532SGeorge Wilson ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 6273f9d6ad7SLin Ling if (err) { 6283f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 6293f9d6ad7SLin Ling return (err); 6303f9d6ad7SLin Ling } 6313f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { 6323f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 6333f9d6ad7SLin Ling dnode_phys_t *cdnp; 6343f9d6ad7SLin Ling int i, j; 6353f9d6ad7SLin Ling int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; 6363f9d6ad7SLin Ling 6371b912ec7SGeorge Wilson err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, 63844ecc532SGeorge Wilson ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 6393f9d6ad7SLin Ling if (err) { 6403f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 6413f9d6ad7SLin Ling return (err); 6423f9d6ad7SLin Ling } 6433f9d6ad7SLin Ling for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { 6443f9d6ad7SLin Ling for (j = 0; j < cdnp->dn_nblkptr; j++) { 6453f9d6ad7SLin Ling blkptr_t *cbp = &cdnp->dn_blkptr[j]; 6463f9d6ad7SLin Ling dsl_scan_prefetch(scn, *bufp, cbp, 6473f9d6ad7SLin Ling zb->zb_objset, zb->zb_blkid * epb + i, j); 6483f9d6ad7SLin Ling } 6493f9d6ad7SLin Ling } 6503f9d6ad7SLin Ling for (i = 0, cdnp = (*bufp)->b_data; i < epb; i++, cdnp++) { 6513f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, ostype, 6523f9d6ad7SLin Ling cdnp, *bufp, zb->zb_blkid * epb + i, tx); 6533f9d6ad7SLin Ling } 6543f9d6ad7SLin Ling 6553f9d6ad7SLin Ling } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { 6563f9d6ad7SLin Ling uint32_t flags = ARC_WAIT; 6573f9d6ad7SLin Ling objset_phys_t *osp; 6583f9d6ad7SLin Ling 6591b912ec7SGeorge Wilson err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, bufp, 66044ecc532SGeorge Wilson ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); 6613f9d6ad7SLin Ling if (err) { 6623f9d6ad7SLin Ling scn->scn_phys.scn_errors++; 6633f9d6ad7SLin Ling return (err); 6643f9d6ad7SLin Ling } 6653f9d6ad7SLin Ling 6663f9d6ad7SLin Ling osp = (*bufp)->b_data; 6673f9d6ad7SLin Ling 6683f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 6693f9d6ad7SLin Ling &osp->os_meta_dnode, *bufp, DMU_META_DNODE_OBJECT, tx); 6703f9d6ad7SLin Ling 6713f9d6ad7SLin Ling if (OBJSET_BUF_HAS_USERUSED(*bufp)) { 6723f9d6ad7SLin Ling /* 6733f9d6ad7SLin Ling * We also always visit user/group accounting 6743f9d6ad7SLin Ling * objects, and never skip them, even if we are 6753f9d6ad7SLin Ling * pausing. This is necessary so that the space 6763f9d6ad7SLin Ling * deltas from this txg get integrated. 6773f9d6ad7SLin Ling */ 6783f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 6793f9d6ad7SLin Ling &osp->os_groupused_dnode, *bufp, 6803f9d6ad7SLin Ling DMU_GROUPUSED_OBJECT, tx); 6813f9d6ad7SLin Ling dsl_scan_visitdnode(scn, ds, osp->os_type, 6823f9d6ad7SLin Ling &osp->os_userused_dnode, *bufp, 6833f9d6ad7SLin Ling DMU_USERUSED_OBJECT, tx); 6843f9d6ad7SLin Ling } 6853f9d6ad7SLin Ling } 6863f9d6ad7SLin Ling 6873f9d6ad7SLin Ling return (0); 6883f9d6ad7SLin Ling } 6893f9d6ad7SLin Ling 6903f9d6ad7SLin Ling static void 6913f9d6ad7SLin Ling dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, 6923f9d6ad7SLin Ling dmu_objset_type_t ostype, dnode_phys_t *dnp, arc_buf_t *buf, 6933f9d6ad7SLin Ling uint64_t object, dmu_tx_t *tx) 6943f9d6ad7SLin Ling { 6953f9d6ad7SLin Ling int j; 6963f9d6ad7SLin Ling 6973f9d6ad7SLin Ling for (j = 0; j < dnp->dn_nblkptr; j++) { 698*7802d7bfSMatthew Ahrens zbookmark_phys_t czb; 6993f9d6ad7SLin Ling 7003f9d6ad7SLin Ling SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, 7013f9d6ad7SLin Ling dnp->dn_nlevels - 1, j); 7023f9d6ad7SLin Ling dsl_scan_visitbp(&dnp->dn_blkptr[j], 7033f9d6ad7SLin Ling &czb, dnp, buf, ds, scn, ostype, tx); 7043f9d6ad7SLin Ling } 7053f9d6ad7SLin Ling 7063f9d6ad7SLin Ling if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { 707*7802d7bfSMatthew Ahrens zbookmark_phys_t czb; 7083f9d6ad7SLin Ling SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, 7093f9d6ad7SLin Ling 0, DMU_SPILL_BLKID); 7103f9d6ad7SLin Ling dsl_scan_visitbp(&dnp->dn_spill, 7113f9d6ad7SLin Ling &czb, dnp, buf, ds, scn, ostype, tx); 7123f9d6ad7SLin Ling } 7133f9d6ad7SLin Ling } 7143f9d6ad7SLin Ling 7153f9d6ad7SLin Ling /* 7163f9d6ad7SLin Ling * The arguments are in this order because mdb can only print the 7173f9d6ad7SLin Ling * first 5; we want them to be useful. 7183f9d6ad7SLin Ling */ 7193f9d6ad7SLin Ling static void 720*7802d7bfSMatthew Ahrens dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb, 7213f9d6ad7SLin Ling dnode_phys_t *dnp, arc_buf_t *pbuf, 7223f9d6ad7SLin Ling dsl_dataset_t *ds, dsl_scan_t *scn, dmu_objset_type_t ostype, 7233f9d6ad7SLin Ling dmu_tx_t *tx) 7243f9d6ad7SLin Ling { 7253f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 7263f9d6ad7SLin Ling arc_buf_t *buf = NULL; 7273f9d6ad7SLin Ling blkptr_t bp_toread = *bp; 7283f9d6ad7SLin Ling 7293f9d6ad7SLin Ling /* ASSERT(pbuf == NULL || arc_released(pbuf)); */ 7303f9d6ad7SLin Ling 7313f9d6ad7SLin Ling if (dsl_scan_check_pause(scn, zb)) 7323f9d6ad7SLin Ling return; 7333f9d6ad7SLin Ling 7343f9d6ad7SLin Ling if (dsl_scan_check_resume(scn, dnp, zb)) 7353f9d6ad7SLin Ling return; 7363f9d6ad7SLin Ling 73743466aaeSMax Grossman if (BP_IS_HOLE(bp)) 7383f9d6ad7SLin Ling return; 7393f9d6ad7SLin Ling 7403f9d6ad7SLin Ling scn->scn_visited_this_txg++; 7413f9d6ad7SLin Ling 7423f9d6ad7SLin Ling dprintf_bp(bp, 7433f9d6ad7SLin Ling "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx buf=%p bp=%p", 7443f9d6ad7SLin Ling ds, ds ? ds->ds_object : 0, 7453f9d6ad7SLin Ling zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, 7463f9d6ad7SLin Ling pbuf, bp); 7473f9d6ad7SLin Ling 7483f9d6ad7SLin Ling if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) 7493f9d6ad7SLin Ling return; 7503f9d6ad7SLin Ling 7513f9d6ad7SLin Ling if (dsl_scan_recurse(scn, ds, ostype, dnp, &bp_toread, zb, tx, 7523f9d6ad7SLin Ling &buf) != 0) 7533f9d6ad7SLin Ling return; 7543f9d6ad7SLin Ling 7553f9d6ad7SLin Ling /* 7563f9d6ad7SLin Ling * If dsl_scan_ddt() has aready visited this block, it will have 7573f9d6ad7SLin Ling * already done any translations or scrubbing, so don't call the 7583f9d6ad7SLin Ling * callback again. 7593f9d6ad7SLin Ling */ 7603f9d6ad7SLin Ling if (ddt_class_contains(dp->dp_spa, 7613f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max, bp)) { 7623f9d6ad7SLin Ling ASSERT(buf == NULL); 7633f9d6ad7SLin Ling return; 7643f9d6ad7SLin Ling } 7653f9d6ad7SLin Ling 7663f9d6ad7SLin Ling /* 7673f9d6ad7SLin Ling * If this block is from the future (after cur_max_txg), then we 7683f9d6ad7SLin Ling * are doing this on behalf of a deleted snapshot, and we will 7693f9d6ad7SLin Ling * revisit the future block on the next pass of this dataset. 7703f9d6ad7SLin Ling * Don't scan it now unless we need to because something 7713f9d6ad7SLin Ling * under it was modified. 7723f9d6ad7SLin Ling */ 773b4952e17SGeorge Wilson if (BP_PHYSICAL_BIRTH(bp) <= scn->scn_phys.scn_cur_max_txg) { 7743f9d6ad7SLin Ling scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); 7753f9d6ad7SLin Ling } 7763f9d6ad7SLin Ling if (buf) 7773f9d6ad7SLin Ling (void) arc_buf_remove_ref(buf, &buf); 7783f9d6ad7SLin Ling } 7793f9d6ad7SLin Ling 7803f9d6ad7SLin Ling static void 7813f9d6ad7SLin Ling dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, 7823f9d6ad7SLin Ling dmu_tx_t *tx) 7833f9d6ad7SLin Ling { 784*7802d7bfSMatthew Ahrens zbookmark_phys_t zb; 7853f9d6ad7SLin Ling 7863f9d6ad7SLin Ling SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 7873f9d6ad7SLin Ling ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 7883f9d6ad7SLin Ling dsl_scan_visitbp(bp, &zb, NULL, NULL, 7893f9d6ad7SLin Ling ds, scn, DMU_OST_NONE, tx); 7903f9d6ad7SLin Ling 7913f9d6ad7SLin Ling dprintf_ds(ds, "finished scan%s", ""); 7923f9d6ad7SLin Ling } 7933f9d6ad7SLin Ling 7943f9d6ad7SLin Ling void 7953f9d6ad7SLin Ling dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) 7963f9d6ad7SLin Ling { 7973f9d6ad7SLin Ling dsl_pool_t *dp = ds->ds_dir->dd_pool; 7983f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 7993f9d6ad7SLin Ling uint64_t mintxg; 8003f9d6ad7SLin Ling 8013f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 8023f9d6ad7SLin Ling return; 8033f9d6ad7SLin Ling 8043f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { 8053f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) { 8063f9d6ad7SLin Ling /* Note, scn_cur_{min,max}_txg stays the same. */ 8073f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = 8083f9d6ad7SLin Ling ds->ds_phys->ds_next_snap_obj; 8093f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; currently traversing; " 8103f9d6ad7SLin Ling "reset zb_objset to %llu", 8113f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 8123f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_next_snap_obj); 8133f9d6ad7SLin Ling scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN; 8143f9d6ad7SLin Ling } else { 8153f9d6ad7SLin Ling SET_BOOKMARK(&scn->scn_phys.scn_bookmark, 8163f9d6ad7SLin Ling ZB_DESTROYED_OBJSET, 0, 0, 0); 8173f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; currently traversing; " 8183f9d6ad7SLin Ling "reset bookmark to -1,0,0,0", 8193f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 8203f9d6ad7SLin Ling } 8213f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 8223f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { 8233f9d6ad7SLin Ling ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 824b420f3adSRichard Lowe VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 8253f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); 8263f9d6ad7SLin Ling if (dsl_dataset_is_snapshot(ds)) { 8273f9d6ad7SLin Ling /* 8283f9d6ad7SLin Ling * We keep the same mintxg; it could be > 8293f9d6ad7SLin Ling * ds_creation_txg if the previous snapshot was 8303f9d6ad7SLin Ling * deleted too. 8313f9d6ad7SLin Ling */ 8323f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 8333f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 8343f9d6ad7SLin Ling ds->ds_phys->ds_next_snap_obj, mintxg, tx) == 0); 8353f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; in queue; " 8363f9d6ad7SLin Ling "replacing with %llu", 8373f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 8383f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_next_snap_obj); 8393f9d6ad7SLin Ling } else { 8403f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; in queue; removing", 8413f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 8423f9d6ad7SLin Ling } 8433f9d6ad7SLin Ling } else { 8443f9d6ad7SLin Ling zfs_dbgmsg("destroying ds %llu; ignoring", 8453f9d6ad7SLin Ling (u_longlong_t)ds->ds_object); 8463f9d6ad7SLin Ling } 8473f9d6ad7SLin Ling 8483f9d6ad7SLin Ling /* 8493f9d6ad7SLin Ling * dsl_scan_sync() should be called after this, and should sync 8503f9d6ad7SLin Ling * out our changed state, but just to be safe, do it here. 8513f9d6ad7SLin Ling */ 8523f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 8533f9d6ad7SLin Ling } 8543f9d6ad7SLin Ling 8553f9d6ad7SLin Ling void 8563f9d6ad7SLin Ling dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) 8573f9d6ad7SLin Ling { 8583f9d6ad7SLin Ling dsl_pool_t *dp = ds->ds_dir->dd_pool; 8593f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 8603f9d6ad7SLin Ling uint64_t mintxg; 8613f9d6ad7SLin Ling 8623f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 8633f9d6ad7SLin Ling return; 8643f9d6ad7SLin Ling 8653f9d6ad7SLin Ling ASSERT(ds->ds_phys->ds_prev_snap_obj != 0); 8663f9d6ad7SLin Ling 8673f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) { 8683f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = 8693f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_obj; 8703f9d6ad7SLin Ling zfs_dbgmsg("snapshotting ds %llu; currently traversing; " 8713f9d6ad7SLin Ling "reset zb_objset to %llu", 8723f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 8733f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); 8743f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 8753f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) { 876b420f3adSRichard Lowe VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 8773f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); 8783f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 8793f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 8803f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_obj, mintxg, tx) == 0); 8813f9d6ad7SLin Ling zfs_dbgmsg("snapshotting ds %llu; in queue; " 8823f9d6ad7SLin Ling "replacing with %llu", 8833f9d6ad7SLin Ling (u_longlong_t)ds->ds_object, 8843f9d6ad7SLin Ling (u_longlong_t)ds->ds_phys->ds_prev_snap_obj); 8853f9d6ad7SLin Ling } 8863f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 8873f9d6ad7SLin Ling } 8883f9d6ad7SLin Ling 8893f9d6ad7SLin Ling void 8903f9d6ad7SLin Ling dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) 8913f9d6ad7SLin Ling { 8923f9d6ad7SLin Ling dsl_pool_t *dp = ds1->ds_dir->dd_pool; 8933f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 8943f9d6ad7SLin Ling uint64_t mintxg; 8953f9d6ad7SLin Ling 8963f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 8973f9d6ad7SLin Ling return; 8983f9d6ad7SLin Ling 8993f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) { 9003f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object; 9013f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; currently traversing; " 9023f9d6ad7SLin Ling "reset zb_objset to %llu", 9033f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object, 9043f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object); 9053f9d6ad7SLin Ling } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) { 9063f9d6ad7SLin Ling scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object; 9073f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; currently traversing; " 9083f9d6ad7SLin Ling "reset zb_objset to %llu", 9093f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object, 9103f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object); 9113f9d6ad7SLin Ling } 9123f9d6ad7SLin Ling 9133f9d6ad7SLin Ling if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, 9143f9d6ad7SLin Ling ds1->ds_object, &mintxg) == 0) { 9153f9d6ad7SLin Ling int err; 9163f9d6ad7SLin Ling 9173f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); 9183f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); 919b420f3adSRichard Lowe VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 9203f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); 9213f9d6ad7SLin Ling err = zap_add_int_key(dp->dp_meta_objset, 9223f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); 9233f9d6ad7SLin Ling VERIFY(err == 0 || err == EEXIST); 9243f9d6ad7SLin Ling if (err == EEXIST) { 9253f9d6ad7SLin Ling /* Both were there to begin with */ 9263f9d6ad7SLin Ling VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, 9273f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 9283f9d6ad7SLin Ling ds1->ds_object, mintxg, tx)); 9293f9d6ad7SLin Ling } 9303f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; in queue; " 9313f9d6ad7SLin Ling "replacing with %llu", 9323f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object, 9333f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object); 9343f9d6ad7SLin Ling } else if (zap_lookup_int_key(dp->dp_meta_objset, 9353f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) { 9363f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds1->ds_phys->ds_prev_snap_txg); 9373f9d6ad7SLin Ling ASSERT3U(mintxg, ==, ds2->ds_phys->ds_prev_snap_txg); 938b420f3adSRichard Lowe VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 9393f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); 9403f9d6ad7SLin Ling VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, 9413f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); 9423f9d6ad7SLin Ling zfs_dbgmsg("clone_swap ds %llu; in queue; " 9433f9d6ad7SLin Ling "replacing with %llu", 9443f9d6ad7SLin Ling (u_longlong_t)ds2->ds_object, 9453f9d6ad7SLin Ling (u_longlong_t)ds1->ds_object); 9463f9d6ad7SLin Ling } 9473f9d6ad7SLin Ling 9483f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 9493f9d6ad7SLin Ling } 9503f9d6ad7SLin Ling 9513f9d6ad7SLin Ling struct enqueue_clones_arg { 9523f9d6ad7SLin Ling dmu_tx_t *tx; 9533f9d6ad7SLin Ling uint64_t originobj; 9543f9d6ad7SLin Ling }; 9553f9d6ad7SLin Ling 9563f9d6ad7SLin Ling /* ARGSUSED */ 9573f9d6ad7SLin Ling static int 9583b2aab18SMatthew Ahrens enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) 9593f9d6ad7SLin Ling { 9603f9d6ad7SLin Ling struct enqueue_clones_arg *eca = arg; 9613f9d6ad7SLin Ling dsl_dataset_t *ds; 9623f9d6ad7SLin Ling int err; 9633f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 9643f9d6ad7SLin Ling 9653b2aab18SMatthew Ahrens if (hds->ds_dir->dd_phys->dd_origin_obj != eca->originobj) 9663b2aab18SMatthew Ahrens return (0); 9673b2aab18SMatthew Ahrens 9683b2aab18SMatthew Ahrens err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); 9693f9d6ad7SLin Ling if (err) 9703f9d6ad7SLin Ling return (err); 9713f9d6ad7SLin Ling 9723b2aab18SMatthew Ahrens while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) { 9733b2aab18SMatthew Ahrens dsl_dataset_t *prev; 9743b2aab18SMatthew Ahrens err = dsl_dataset_hold_obj(dp, 9753b2aab18SMatthew Ahrens ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 9763f9d6ad7SLin Ling 9773b2aab18SMatthew Ahrens dsl_dataset_rele(ds, FTAG); 9783b2aab18SMatthew Ahrens if (err) 9793b2aab18SMatthew Ahrens return (err); 9803b2aab18SMatthew Ahrens ds = prev; 9813f9d6ad7SLin Ling } 9823b2aab18SMatthew Ahrens VERIFY(zap_add_int_key(dp->dp_meta_objset, 9833b2aab18SMatthew Ahrens scn->scn_phys.scn_queue_obj, ds->ds_object, 9843b2aab18SMatthew Ahrens ds->ds_phys->ds_prev_snap_txg, eca->tx) == 0); 9853f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 9863f9d6ad7SLin Ling return (0); 9873f9d6ad7SLin Ling } 9883f9d6ad7SLin Ling 9893f9d6ad7SLin Ling static void 9903f9d6ad7SLin Ling dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) 9913f9d6ad7SLin Ling { 9923f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 9933f9d6ad7SLin Ling dsl_dataset_t *ds; 9946e0cbcaaSMatthew Ahrens objset_t *os; 9953f9d6ad7SLin Ling 996b420f3adSRichard Lowe VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 9973f9d6ad7SLin Ling 9986e0cbcaaSMatthew Ahrens if (dmu_objset_from_ds(ds, &os)) 9996e0cbcaaSMatthew Ahrens goto out; 10006e0cbcaaSMatthew Ahrens 10016e0cbcaaSMatthew Ahrens /* 10026e0cbcaaSMatthew Ahrens * Only the ZIL in the head (non-snapshot) is valid. Even though 10036e0cbcaaSMatthew Ahrens * snapshots can have ZIL block pointers (which may be the same 10046e0cbcaaSMatthew Ahrens * BP as in the head), they must be ignored. So we traverse the 10056e0cbcaaSMatthew Ahrens * ZIL here, rather than in scan_recurse(), because the regular 10066e0cbcaaSMatthew Ahrens * snapshot block-sharing rules don't apply to it. 10076e0cbcaaSMatthew Ahrens */ 10086e0cbcaaSMatthew Ahrens if (DSL_SCAN_IS_SCRUB_RESILVER(scn) && !dsl_dataset_is_snapshot(ds)) 10096e0cbcaaSMatthew Ahrens dsl_scan_zil(dp, &os->os_zil_header); 10106e0cbcaaSMatthew Ahrens 10113f9d6ad7SLin Ling /* 10123f9d6ad7SLin Ling * Iterate over the bps in this ds. 10133f9d6ad7SLin Ling */ 10143f9d6ad7SLin Ling dmu_buf_will_dirty(ds->ds_dbuf, tx); 10153f9d6ad7SLin Ling dsl_scan_visit_rootbp(scn, ds, &ds->ds_phys->ds_bp, tx); 10163f9d6ad7SLin Ling 10173f9d6ad7SLin Ling char *dsname = kmem_alloc(ZFS_MAXNAMELEN, KM_SLEEP); 10183f9d6ad7SLin Ling dsl_dataset_name(ds, dsname); 10193f9d6ad7SLin Ling zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; " 10203f9d6ad7SLin Ling "pausing=%u", 10213f9d6ad7SLin Ling (longlong_t)dsobj, dsname, 10223f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_cur_min_txg, 10233f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_cur_max_txg, 10243f9d6ad7SLin Ling (int)scn->scn_pausing); 10253f9d6ad7SLin Ling kmem_free(dsname, ZFS_MAXNAMELEN); 10263f9d6ad7SLin Ling 10273f9d6ad7SLin Ling if (scn->scn_pausing) 10283f9d6ad7SLin Ling goto out; 10293f9d6ad7SLin Ling 10303f9d6ad7SLin Ling /* 10313f9d6ad7SLin Ling * We've finished this pass over this dataset. 10323f9d6ad7SLin Ling */ 10333f9d6ad7SLin Ling 10343f9d6ad7SLin Ling /* 10353f9d6ad7SLin Ling * If we did not completely visit this dataset, do another pass. 10363f9d6ad7SLin Ling */ 10373f9d6ad7SLin Ling if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) { 10383f9d6ad7SLin Ling zfs_dbgmsg("incomplete pass; visiting again"); 10393f9d6ad7SLin Ling scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN; 10403f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 10413f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_object, 10423f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg, tx) == 0); 10433f9d6ad7SLin Ling goto out; 10443f9d6ad7SLin Ling } 10453f9d6ad7SLin Ling 10463f9d6ad7SLin Ling /* 10473f9d6ad7SLin Ling * Add descendent datasets to work queue. 10483f9d6ad7SLin Ling */ 10493f9d6ad7SLin Ling if (ds->ds_phys->ds_next_snap_obj != 0) { 10503f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, 10513f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, ds->ds_phys->ds_next_snap_obj, 10523f9d6ad7SLin Ling ds->ds_phys->ds_creation_txg, tx) == 0); 10533f9d6ad7SLin Ling } 10543f9d6ad7SLin Ling if (ds->ds_phys->ds_num_children > 1) { 10553f9d6ad7SLin Ling boolean_t usenext = B_FALSE; 10563f9d6ad7SLin Ling if (ds->ds_phys->ds_next_clones_obj != 0) { 10573f9d6ad7SLin Ling uint64_t count; 10583f9d6ad7SLin Ling /* 10593f9d6ad7SLin Ling * A bug in a previous version of the code could 10603f9d6ad7SLin Ling * cause upgrade_clones_cb() to not set 10613f9d6ad7SLin Ling * ds_next_snap_obj when it should, leading to a 10623f9d6ad7SLin Ling * missing entry. Therefore we can only use the 10633f9d6ad7SLin Ling * next_clones_obj when its count is correct. 10643f9d6ad7SLin Ling */ 10653f9d6ad7SLin Ling int err = zap_count(dp->dp_meta_objset, 10663f9d6ad7SLin Ling ds->ds_phys->ds_next_clones_obj, &count); 10673f9d6ad7SLin Ling if (err == 0 && 10683f9d6ad7SLin Ling count == ds->ds_phys->ds_num_children - 1) 10693f9d6ad7SLin Ling usenext = B_TRUE; 10703f9d6ad7SLin Ling } 10713f9d6ad7SLin Ling 10723f9d6ad7SLin Ling if (usenext) { 10733b2aab18SMatthew Ahrens VERIFY0(zap_join_key(dp->dp_meta_objset, 10743f9d6ad7SLin Ling ds->ds_phys->ds_next_clones_obj, 10753f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, 10763b2aab18SMatthew Ahrens ds->ds_phys->ds_creation_txg, tx)); 10773f9d6ad7SLin Ling } else { 10783f9d6ad7SLin Ling struct enqueue_clones_arg eca; 10793f9d6ad7SLin Ling eca.tx = tx; 10803f9d6ad7SLin Ling eca.originobj = ds->ds_object; 10813f9d6ad7SLin Ling 10823b2aab18SMatthew Ahrens VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 10833b2aab18SMatthew Ahrens enqueue_clones_cb, &eca, DS_FIND_CHILDREN)); 10843f9d6ad7SLin Ling } 10853f9d6ad7SLin Ling } 10863f9d6ad7SLin Ling 10873f9d6ad7SLin Ling out: 10883f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 10893f9d6ad7SLin Ling } 10903f9d6ad7SLin Ling 10913f9d6ad7SLin Ling /* ARGSUSED */ 10923f9d6ad7SLin Ling static int 10933b2aab18SMatthew Ahrens enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) 10943f9d6ad7SLin Ling { 10953f9d6ad7SLin Ling dmu_tx_t *tx = arg; 10963f9d6ad7SLin Ling dsl_dataset_t *ds; 10973f9d6ad7SLin Ling int err; 10983f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 10993f9d6ad7SLin Ling 11003b2aab18SMatthew Ahrens err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); 11013f9d6ad7SLin Ling if (err) 11023f9d6ad7SLin Ling return (err); 11033f9d6ad7SLin Ling 11043f9d6ad7SLin Ling while (ds->ds_phys->ds_prev_snap_obj != 0) { 11053f9d6ad7SLin Ling dsl_dataset_t *prev; 11063f9d6ad7SLin Ling err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, 11073f9d6ad7SLin Ling FTAG, &prev); 11083f9d6ad7SLin Ling if (err) { 11093f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 11103f9d6ad7SLin Ling return (err); 11113f9d6ad7SLin Ling } 11123f9d6ad7SLin Ling 11133f9d6ad7SLin Ling /* 11143f9d6ad7SLin Ling * If this is a clone, we don't need to worry about it for now. 11153f9d6ad7SLin Ling */ 11163f9d6ad7SLin Ling if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 11173f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 11183f9d6ad7SLin Ling dsl_dataset_rele(prev, FTAG); 11193f9d6ad7SLin Ling return (0); 11203f9d6ad7SLin Ling } 11213f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 11223f9d6ad7SLin Ling ds = prev; 11233f9d6ad7SLin Ling } 11243f9d6ad7SLin Ling 11253f9d6ad7SLin Ling VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, 11263f9d6ad7SLin Ling ds->ds_object, ds->ds_phys->ds_prev_snap_txg, tx) == 0); 11273f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 11283f9d6ad7SLin Ling return (0); 11293f9d6ad7SLin Ling } 11303f9d6ad7SLin Ling 11313f9d6ad7SLin Ling /* 11323f9d6ad7SLin Ling * Scrub/dedup interaction. 11333f9d6ad7SLin Ling * 11343f9d6ad7SLin Ling * If there are N references to a deduped block, we don't want to scrub it 11353f9d6ad7SLin Ling * N times -- ideally, we should scrub it exactly once. 11363f9d6ad7SLin Ling * 11373f9d6ad7SLin Ling * We leverage the fact that the dde's replication class (enum ddt_class) 11383f9d6ad7SLin Ling * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest 11393f9d6ad7SLin Ling * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order. 11403f9d6ad7SLin Ling * 11413f9d6ad7SLin Ling * To prevent excess scrubbing, the scrub begins by walking the DDT 11423f9d6ad7SLin Ling * to find all blocks with refcnt > 1, and scrubs each of these once. 11433f9d6ad7SLin Ling * Since there are two replication classes which contain blocks with 11443f9d6ad7SLin Ling * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first. 11453f9d6ad7SLin Ling * Finally the top-down scrub begins, only visiting blocks with refcnt == 1. 11463f9d6ad7SLin Ling * 11473f9d6ad7SLin Ling * There would be nothing more to say if a block's refcnt couldn't change 11483f9d6ad7SLin Ling * during a scrub, but of course it can so we must account for changes 11493f9d6ad7SLin Ling * in a block's replication class. 11503f9d6ad7SLin Ling * 11513f9d6ad7SLin Ling * Here's an example of what can occur: 11523f9d6ad7SLin Ling * 11533f9d6ad7SLin Ling * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1 11543f9d6ad7SLin Ling * when visited during the top-down scrub phase, it will be scrubbed twice. 11553f9d6ad7SLin Ling * This negates our scrub optimization, but is otherwise harmless. 11563f9d6ad7SLin Ling * 11573f9d6ad7SLin Ling * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1 11583f9d6ad7SLin Ling * on each visit during the top-down scrub phase, it will never be scrubbed. 11593f9d6ad7SLin Ling * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's 11603f9d6ad7SLin Ling * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to 11613f9d6ad7SLin Ling * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1 11623f9d6ad7SLin Ling * while a scrub is in progress, it scrubs the block right then. 11633f9d6ad7SLin Ling */ 11643f9d6ad7SLin Ling static void 11653f9d6ad7SLin Ling dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx) 11663f9d6ad7SLin Ling { 11673f9d6ad7SLin Ling ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark; 11683f9d6ad7SLin Ling ddt_entry_t dde = { 0 }; 11693f9d6ad7SLin Ling int error; 11703f9d6ad7SLin Ling uint64_t n = 0; 11713f9d6ad7SLin Ling 11723f9d6ad7SLin Ling while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { 11733f9d6ad7SLin Ling ddt_t *ddt; 11743f9d6ad7SLin Ling 11753f9d6ad7SLin Ling if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) 11763f9d6ad7SLin Ling break; 11773f9d6ad7SLin Ling dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", 11783f9d6ad7SLin Ling (longlong_t)ddb->ddb_class, 11793f9d6ad7SLin Ling (longlong_t)ddb->ddb_type, 11803f9d6ad7SLin Ling (longlong_t)ddb->ddb_checksum, 11813f9d6ad7SLin Ling (longlong_t)ddb->ddb_cursor); 11823f9d6ad7SLin Ling 11833f9d6ad7SLin Ling /* There should be no pending changes to the dedup table */ 11843f9d6ad7SLin Ling ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; 11853f9d6ad7SLin Ling ASSERT(avl_first(&ddt->ddt_tree) == NULL); 11863f9d6ad7SLin Ling 11873f9d6ad7SLin Ling dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); 11883f9d6ad7SLin Ling n++; 11893f9d6ad7SLin Ling 11903f9d6ad7SLin Ling if (dsl_scan_check_pause(scn, NULL)) 11913f9d6ad7SLin Ling break; 11923f9d6ad7SLin Ling } 11933f9d6ad7SLin Ling 11943f9d6ad7SLin Ling zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; pausing=%u", 11953f9d6ad7SLin Ling (longlong_t)n, (int)scn->scn_phys.scn_ddt_class_max, 11963f9d6ad7SLin Ling (int)scn->scn_pausing); 11973f9d6ad7SLin Ling 11983f9d6ad7SLin Ling ASSERT(error == 0 || error == ENOENT); 11993f9d6ad7SLin Ling ASSERT(error != ENOENT || 12003f9d6ad7SLin Ling ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); 12013f9d6ad7SLin Ling } 12023f9d6ad7SLin Ling 12033f9d6ad7SLin Ling /* ARGSUSED */ 12043f9d6ad7SLin Ling void 12053f9d6ad7SLin Ling dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, 12063f9d6ad7SLin Ling ddt_entry_t *dde, dmu_tx_t *tx) 12073f9d6ad7SLin Ling { 12083f9d6ad7SLin Ling const ddt_key_t *ddk = &dde->dde_key; 12093f9d6ad7SLin Ling ddt_phys_t *ddp = dde->dde_phys; 12103f9d6ad7SLin Ling blkptr_t bp; 1211*7802d7bfSMatthew Ahrens zbookmark_phys_t zb = { 0 }; 12123f9d6ad7SLin Ling 12133f9d6ad7SLin Ling if (scn->scn_phys.scn_state != DSS_SCANNING) 12143f9d6ad7SLin Ling return; 12153f9d6ad7SLin Ling 12163f9d6ad7SLin Ling for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 12173f9d6ad7SLin Ling if (ddp->ddp_phys_birth == 0 || 1218b4952e17SGeorge Wilson ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg) 12193f9d6ad7SLin Ling continue; 12203f9d6ad7SLin Ling ddt_bp_create(checksum, ddk, ddp, &bp); 12213f9d6ad7SLin Ling 12223f9d6ad7SLin Ling scn->scn_visited_this_txg++; 12233f9d6ad7SLin Ling scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); 12243f9d6ad7SLin Ling } 12253f9d6ad7SLin Ling } 12263f9d6ad7SLin Ling 12273f9d6ad7SLin Ling static void 12283f9d6ad7SLin Ling dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) 12293f9d6ad7SLin Ling { 12303f9d6ad7SLin Ling dsl_pool_t *dp = scn->scn_dp; 12313f9d6ad7SLin Ling zap_cursor_t zc; 12323f9d6ad7SLin Ling zap_attribute_t za; 12333f9d6ad7SLin Ling 12343f9d6ad7SLin Ling if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= 12353f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max) { 12363f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; 12373f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; 12383f9d6ad7SLin Ling dsl_scan_ddt(scn, tx); 12393f9d6ad7SLin Ling if (scn->scn_pausing) 12403f9d6ad7SLin Ling return; 12413f9d6ad7SLin Ling } 12423f9d6ad7SLin Ling 12433f9d6ad7SLin Ling if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { 12443f9d6ad7SLin Ling /* First do the MOS & ORIGIN */ 12453f9d6ad7SLin Ling 12463f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; 12473f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; 12483f9d6ad7SLin Ling dsl_scan_visit_rootbp(scn, NULL, 12493f9d6ad7SLin Ling &dp->dp_meta_rootbp, tx); 12503f9d6ad7SLin Ling spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); 12513f9d6ad7SLin Ling if (scn->scn_pausing) 12523f9d6ad7SLin Ling return; 12533f9d6ad7SLin Ling 12543f9d6ad7SLin Ling if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { 12553b2aab18SMatthew Ahrens VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 12563b2aab18SMatthew Ahrens enqueue_cb, tx, DS_FIND_CHILDREN)); 12573f9d6ad7SLin Ling } else { 12583f9d6ad7SLin Ling dsl_scan_visitds(scn, 12593f9d6ad7SLin Ling dp->dp_origin_snap->ds_object, tx); 12603f9d6ad7SLin Ling } 12613f9d6ad7SLin Ling ASSERT(!scn->scn_pausing); 12623f9d6ad7SLin Ling } else if (scn->scn_phys.scn_bookmark.zb_objset != 12633f9d6ad7SLin Ling ZB_DESTROYED_OBJSET) { 12643f9d6ad7SLin Ling /* 12653f9d6ad7SLin Ling * If we were paused, continue from here. Note if the 12663f9d6ad7SLin Ling * ds we were paused on was deleted, the zb_objset may 12673f9d6ad7SLin Ling * be -1, so we will skip this and find a new objset 12683f9d6ad7SLin Ling * below. 12693f9d6ad7SLin Ling */ 12703f9d6ad7SLin Ling dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx); 12713f9d6ad7SLin Ling if (scn->scn_pausing) 12723f9d6ad7SLin Ling return; 12733f9d6ad7SLin Ling } 12743f9d6ad7SLin Ling 12753f9d6ad7SLin Ling /* 12763f9d6ad7SLin Ling * In case we were paused right at the end of the ds, zero the 12773f9d6ad7SLin Ling * bookmark so we don't think that we're still trying to resume. 12783f9d6ad7SLin Ling */ 1279*7802d7bfSMatthew Ahrens bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_phys_t)); 12803f9d6ad7SLin Ling 12813f9d6ad7SLin Ling /* keep pulling things out of the zap-object-as-queue */ 12823f9d6ad7SLin Ling while (zap_cursor_init(&zc, dp->dp_meta_objset, 12833f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj), 12843f9d6ad7SLin Ling zap_cursor_retrieve(&zc, &za) == 0) { 12853f9d6ad7SLin Ling dsl_dataset_t *ds; 12863f9d6ad7SLin Ling uint64_t dsobj; 12873f9d6ad7SLin Ling 12883f9d6ad7SLin Ling dsobj = strtonum(za.za_name, NULL); 1289b420f3adSRichard Lowe VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 12903f9d6ad7SLin Ling scn->scn_phys.scn_queue_obj, dsobj, tx)); 12913f9d6ad7SLin Ling 12923f9d6ad7SLin Ling /* Set up min/max txg */ 1293b420f3adSRichard Lowe VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 12943f9d6ad7SLin Ling if (za.za_first_integer != 0) { 12953f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = 12963f9d6ad7SLin Ling MAX(scn->scn_phys.scn_min_txg, 12973f9d6ad7SLin Ling za.za_first_integer); 12983f9d6ad7SLin Ling } else { 12993f9d6ad7SLin Ling scn->scn_phys.scn_cur_min_txg = 13003f9d6ad7SLin Ling MAX(scn->scn_phys.scn_min_txg, 13013f9d6ad7SLin Ling ds->ds_phys->ds_prev_snap_txg); 13023f9d6ad7SLin Ling } 13033f9d6ad7SLin Ling scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); 13043f9d6ad7SLin Ling dsl_dataset_rele(ds, FTAG); 13053f9d6ad7SLin Ling 13063f9d6ad7SLin Ling dsl_scan_visitds(scn, dsobj, tx); 13073f9d6ad7SLin Ling zap_cursor_fini(&zc); 13083f9d6ad7SLin Ling if (scn->scn_pausing) 13093f9d6ad7SLin Ling return; 13103f9d6ad7SLin Ling } 13113f9d6ad7SLin Ling zap_cursor_fini(&zc); 13123f9d6ad7SLin Ling } 13133f9d6ad7SLin Ling 1314ad135b5dSChristopher Siden static boolean_t 1315ad135b5dSChristopher Siden dsl_scan_free_should_pause(dsl_scan_t *scn) 1316cde58dbcSMatthew Ahrens { 1317cde58dbcSMatthew Ahrens uint64_t elapsed_nanosecs; 1318cde58dbcSMatthew Ahrens 13198b36997aSMatthew Ahrens if (zfs_recover) 13208b36997aSMatthew Ahrens return (B_FALSE); 13218b36997aSMatthew Ahrens 1322cde58dbcSMatthew Ahrens elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; 1323ad135b5dSChristopher Siden return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || 13240689f76cSAdam Leventhal (NSEC2MSEC(elapsed_nanosecs) > zfs_free_min_time_ms && 1325cde58dbcSMatthew Ahrens txg_sync_waiting(scn->scn_dp)) || 1326ad135b5dSChristopher Siden spa_shutting_down(scn->scn_dp->dp_spa)); 1327ad135b5dSChristopher Siden } 1328ad135b5dSChristopher Siden 1329ad135b5dSChristopher Siden static int 1330ad135b5dSChristopher Siden dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1331ad135b5dSChristopher Siden { 1332ad135b5dSChristopher Siden dsl_scan_t *scn = arg; 1333ad135b5dSChristopher Siden 1334ad135b5dSChristopher Siden if (!scn->scn_is_bptree || 1335ad135b5dSChristopher Siden (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_OBJSET)) { 1336ad135b5dSChristopher Siden if (dsl_scan_free_should_pause(scn)) 1337be6fd75aSMatthew Ahrens return (SET_ERROR(ERESTART)); 1338ad135b5dSChristopher Siden } 1339cde58dbcSMatthew Ahrens 1340cde58dbcSMatthew Ahrens zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa, 1341cde58dbcSMatthew Ahrens dmu_tx_get_txg(tx), bp, 0)); 1342cde58dbcSMatthew Ahrens dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, 1343cde58dbcSMatthew Ahrens -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp), 1344cde58dbcSMatthew Ahrens -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); 1345cde58dbcSMatthew Ahrens scn->scn_visited_this_txg++; 1346cde58dbcSMatthew Ahrens return (0); 1347cde58dbcSMatthew Ahrens } 1348cde58dbcSMatthew Ahrens 1349cde58dbcSMatthew Ahrens boolean_t 1350cde58dbcSMatthew Ahrens dsl_scan_active(dsl_scan_t *scn) 1351cde58dbcSMatthew Ahrens { 1352cde58dbcSMatthew Ahrens spa_t *spa = scn->scn_dp->dp_spa; 1353cde58dbcSMatthew Ahrens uint64_t used = 0, comp, uncomp; 1354cde58dbcSMatthew Ahrens 1355cde58dbcSMatthew Ahrens if (spa->spa_load_state != SPA_LOAD_NONE) 1356cde58dbcSMatthew Ahrens return (B_FALSE); 1357cde58dbcSMatthew Ahrens if (spa_shutting_down(spa)) 1358cde58dbcSMatthew Ahrens return (B_FALSE); 13594a923759SGeorge Wilson if (scn->scn_phys.scn_state == DSS_SCANNING || 13607fd05ac4SMatthew Ahrens (scn->scn_async_destroying && !scn->scn_async_stalled)) 1361cde58dbcSMatthew Ahrens return (B_TRUE); 1362cde58dbcSMatthew Ahrens 1363cde58dbcSMatthew Ahrens if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) { 1364cde58dbcSMatthew Ahrens (void) bpobj_space(&scn->scn_dp->dp_free_bpobj, 1365cde58dbcSMatthew Ahrens &used, &comp, &uncomp); 1366cde58dbcSMatthew Ahrens } 1367cde58dbcSMatthew Ahrens return (used != 0); 1368cde58dbcSMatthew Ahrens } 1369cde58dbcSMatthew Ahrens 13703f9d6ad7SLin Ling void 13713f9d6ad7SLin Ling dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) 13723f9d6ad7SLin Ling { 13733f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 13743f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 13757fd05ac4SMatthew Ahrens int err = 0; 13763f9d6ad7SLin Ling 13773f9d6ad7SLin Ling /* 13783f9d6ad7SLin Ling * Check for scn_restart_txg before checking spa_load_state, so 13793f9d6ad7SLin Ling * that we can restart an old-style scan while the pool is being 13803f9d6ad7SLin Ling * imported (see dsl_scan_init). 13813f9d6ad7SLin Ling */ 13823f9d6ad7SLin Ling if (scn->scn_restart_txg != 0 && 13833f9d6ad7SLin Ling scn->scn_restart_txg <= tx->tx_txg) { 13843f9d6ad7SLin Ling pool_scan_func_t func = POOL_SCAN_SCRUB; 13853f9d6ad7SLin Ling dsl_scan_done(scn, B_FALSE, tx); 13863f9d6ad7SLin Ling if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) 13873f9d6ad7SLin Ling func = POOL_SCAN_RESILVER; 13883f9d6ad7SLin Ling zfs_dbgmsg("restarting scan func=%u txg=%llu", 13893f9d6ad7SLin Ling func, tx->tx_txg); 13903b2aab18SMatthew Ahrens dsl_scan_setup_sync(&func, tx); 13913f9d6ad7SLin Ling } 13923f9d6ad7SLin Ling 13937fd05ac4SMatthew Ahrens /* 13947fd05ac4SMatthew Ahrens * If the scan is inactive due to a stalled async destroy, try again. 13957fd05ac4SMatthew Ahrens */ 13967fd05ac4SMatthew Ahrens if ((!scn->scn_async_stalled && !dsl_scan_active(scn)) || 1397cde58dbcSMatthew Ahrens spa_sync_pass(dp->dp_spa) > 1) 13983f9d6ad7SLin Ling return; 13993f9d6ad7SLin Ling 14003f9d6ad7SLin Ling scn->scn_visited_this_txg = 0; 14013f9d6ad7SLin Ling scn->scn_pausing = B_FALSE; 14023f9d6ad7SLin Ling scn->scn_sync_start_time = gethrtime(); 14033f9d6ad7SLin Ling spa->spa_scrub_active = B_TRUE; 14043f9d6ad7SLin Ling 1405cde58dbcSMatthew Ahrens /* 14067fd05ac4SMatthew Ahrens * First process the async destroys. If we pause, don't do 14077fd05ac4SMatthew Ahrens * any scrubbing or resilvering. This ensures that there are no 14087fd05ac4SMatthew Ahrens * async destroys while we are scanning, so the scan code doesn't 14097fd05ac4SMatthew Ahrens * have to worry about traversing it. It is also faster to free the 14107fd05ac4SMatthew Ahrens * blocks than to scrub them. 1411cde58dbcSMatthew Ahrens */ 1412cde58dbcSMatthew Ahrens if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { 1413ad135b5dSChristopher Siden scn->scn_is_bptree = B_FALSE; 1414cde58dbcSMatthew Ahrens scn->scn_zio_root = zio_root(dp->dp_spa, NULL, 1415cde58dbcSMatthew Ahrens NULL, ZIO_FLAG_MUSTSUCCEED); 1416cde58dbcSMatthew Ahrens err = bpobj_iterate(&dp->dp_free_bpobj, 1417ad135b5dSChristopher Siden dsl_scan_free_block_cb, scn, tx); 1418b420f3adSRichard Lowe VERIFY3U(0, ==, zio_wait(scn->scn_zio_root)); 1419ad135b5dSChristopher Siden 14207fd05ac4SMatthew Ahrens if (err != 0 && err != ERESTART) 14217fd05ac4SMatthew Ahrens zfs_panic_recover("error %u from bpobj_iterate()", err); 14227fd05ac4SMatthew Ahrens } 14237fd05ac4SMatthew Ahrens 14247fd05ac4SMatthew Ahrens if (err == 0 && spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) { 14257fd05ac4SMatthew Ahrens ASSERT(scn->scn_async_destroying); 14267fd05ac4SMatthew Ahrens scn->scn_is_bptree = B_TRUE; 14277fd05ac4SMatthew Ahrens scn->scn_zio_root = zio_root(dp->dp_spa, NULL, 14287fd05ac4SMatthew Ahrens NULL, ZIO_FLAG_MUSTSUCCEED); 14297fd05ac4SMatthew Ahrens err = bptree_iterate(dp->dp_meta_objset, 14307fd05ac4SMatthew Ahrens dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, scn, tx); 14317fd05ac4SMatthew Ahrens VERIFY0(zio_wait(scn->scn_zio_root)); 14327fd05ac4SMatthew Ahrens 14337fd05ac4SMatthew Ahrens if (err == EIO || err == ECKSUM) { 14347fd05ac4SMatthew Ahrens err = 0; 14357fd05ac4SMatthew Ahrens } else if (err != 0 && err != ERESTART) { 14367fd05ac4SMatthew Ahrens zfs_panic_recover("error %u from " 14377fd05ac4SMatthew Ahrens "traverse_dataset_destroyed()", err); 1438ad135b5dSChristopher Siden } 14397fd05ac4SMatthew Ahrens 14407fd05ac4SMatthew Ahrens /* 14417fd05ac4SMatthew Ahrens * If we didn't make progress, mark the async destroy as 14427fd05ac4SMatthew Ahrens * stalled, so that we will not initiate a spa_sync() on 14437fd05ac4SMatthew Ahrens * its behalf. 14447fd05ac4SMatthew Ahrens */ 14457fd05ac4SMatthew Ahrens scn->scn_async_stalled = (scn->scn_visited_this_txg == 0); 14467fd05ac4SMatthew Ahrens 14477fd05ac4SMatthew Ahrens if (bptree_is_empty(dp->dp_meta_objset, dp->dp_bptree_obj)) { 14487fd05ac4SMatthew Ahrens /* finished; deactivate async destroy feature */ 14497fd05ac4SMatthew Ahrens spa_feature_decr(spa, SPA_FEATURE_ASYNC_DESTROY, tx); 14507fd05ac4SMatthew Ahrens ASSERT(!spa_feature_is_active(spa, 14517fd05ac4SMatthew Ahrens SPA_FEATURE_ASYNC_DESTROY)); 14527fd05ac4SMatthew Ahrens VERIFY0(zap_remove(dp->dp_meta_objset, 14537fd05ac4SMatthew Ahrens DMU_POOL_DIRECTORY_OBJECT, 14547fd05ac4SMatthew Ahrens DMU_POOL_BPTREE_OBJ, tx)); 14557fd05ac4SMatthew Ahrens VERIFY0(bptree_free(dp->dp_meta_objset, 14567fd05ac4SMatthew Ahrens dp->dp_bptree_obj, tx)); 14577fd05ac4SMatthew Ahrens dp->dp_bptree_obj = 0; 14587fd05ac4SMatthew Ahrens scn->scn_async_destroying = B_FALSE; 1459cde58dbcSMatthew Ahrens } 14607fd05ac4SMatthew Ahrens } 14617fd05ac4SMatthew Ahrens if (scn->scn_visited_this_txg) { 14627fd05ac4SMatthew Ahrens zfs_dbgmsg("freed %llu blocks in %llums from " 14637fd05ac4SMatthew Ahrens "free_bpobj/bptree txg %llu; err=%u", 14647fd05ac4SMatthew Ahrens (longlong_t)scn->scn_visited_this_txg, 14657fd05ac4SMatthew Ahrens (longlong_t) 14667fd05ac4SMatthew Ahrens NSEC2MSEC(gethrtime() - scn->scn_sync_start_time), 14677fd05ac4SMatthew Ahrens (longlong_t)tx->tx_txg, err); 14687fd05ac4SMatthew Ahrens scn->scn_visited_this_txg = 0; 14697fd05ac4SMatthew Ahrens 14707fd05ac4SMatthew Ahrens /* 14717fd05ac4SMatthew Ahrens * Write out changes to the DDT that may be required as a 14727fd05ac4SMatthew Ahrens * result of the blocks freed. This ensures that the DDT 14737fd05ac4SMatthew Ahrens * is clean when a scrub/resilver runs. 14747fd05ac4SMatthew Ahrens */ 14757fd05ac4SMatthew Ahrens ddt_sync(spa, tx->tx_txg); 14767fd05ac4SMatthew Ahrens } 14777fd05ac4SMatthew Ahrens if (err != 0) 14787fd05ac4SMatthew Ahrens return; 14797fd05ac4SMatthew Ahrens if (!scn->scn_async_destroying && zfs_free_leak_on_eio && 14807fd05ac4SMatthew Ahrens (dp->dp_free_dir->dd_phys->dd_used_bytes != 0 || 14817fd05ac4SMatthew Ahrens dp->dp_free_dir->dd_phys->dd_compressed_bytes != 0 || 14827fd05ac4SMatthew Ahrens dp->dp_free_dir->dd_phys->dd_uncompressed_bytes != 0)) { 14837fd05ac4SMatthew Ahrens /* 14847fd05ac4SMatthew Ahrens * We have finished background destroying, but there is still 14857fd05ac4SMatthew Ahrens * some space left in the dp_free_dir. Transfer this leaked 14867fd05ac4SMatthew Ahrens * space to the dp_leak_dir. 14877fd05ac4SMatthew Ahrens */ 14887fd05ac4SMatthew Ahrens if (dp->dp_leak_dir == NULL) { 14897fd05ac4SMatthew Ahrens rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 14907fd05ac4SMatthew Ahrens (void) dsl_dir_create_sync(dp, dp->dp_root_dir, 14917fd05ac4SMatthew Ahrens LEAK_DIR_NAME, tx); 14927fd05ac4SMatthew Ahrens VERIFY0(dsl_pool_open_special_dir(dp, 14937fd05ac4SMatthew Ahrens LEAK_DIR_NAME, &dp->dp_leak_dir)); 14947fd05ac4SMatthew Ahrens rrw_exit(&dp->dp_config_rwlock, FTAG); 14957fd05ac4SMatthew Ahrens } 14967fd05ac4SMatthew Ahrens dsl_dir_diduse_space(dp->dp_leak_dir, DD_USED_HEAD, 14977fd05ac4SMatthew Ahrens dp->dp_free_dir->dd_phys->dd_used_bytes, 14987fd05ac4SMatthew Ahrens dp->dp_free_dir->dd_phys->dd_compressed_bytes, 14997fd05ac4SMatthew Ahrens dp->dp_free_dir->dd_phys->dd_uncompressed_bytes, tx); 15007fd05ac4SMatthew Ahrens dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD, 15017fd05ac4SMatthew Ahrens -dp->dp_free_dir->dd_phys->dd_used_bytes, 15027fd05ac4SMatthew Ahrens -dp->dp_free_dir->dd_phys->dd_compressed_bytes, 15037fd05ac4SMatthew Ahrens -dp->dp_free_dir->dd_phys->dd_uncompressed_bytes, tx); 15047fd05ac4SMatthew Ahrens } 15057fd05ac4SMatthew Ahrens if (!scn->scn_async_destroying) { 15065d7b4d43SMatthew Ahrens /* finished; verify that space accounting went to zero */ 15075d7b4d43SMatthew Ahrens ASSERT0(dp->dp_free_dir->dd_phys->dd_used_bytes); 15085d7b4d43SMatthew Ahrens ASSERT0(dp->dp_free_dir->dd_phys->dd_compressed_bytes); 15095d7b4d43SMatthew Ahrens ASSERT0(dp->dp_free_dir->dd_phys->dd_uncompressed_bytes); 1510cde58dbcSMatthew Ahrens } 1511cde58dbcSMatthew Ahrens 1512cde58dbcSMatthew Ahrens if (scn->scn_phys.scn_state != DSS_SCANNING) 1513cde58dbcSMatthew Ahrens return; 1514cde58dbcSMatthew Ahrens 1515b4952e17SGeorge Wilson if (scn->scn_done_txg == tx->tx_txg) { 1516b4952e17SGeorge Wilson ASSERT(!scn->scn_pausing); 1517b4952e17SGeorge Wilson /* finished with scan. */ 1518b4952e17SGeorge Wilson zfs_dbgmsg("txg %llu scan complete", tx->tx_txg); 1519b4952e17SGeorge Wilson dsl_scan_done(scn, B_TRUE, tx); 1520b4952e17SGeorge Wilson ASSERT3U(spa->spa_scrub_inflight, ==, 0); 1521b4952e17SGeorge Wilson dsl_scan_sync_state(scn, tx); 1522b4952e17SGeorge Wilson return; 1523b4952e17SGeorge Wilson } 1524b4952e17SGeorge Wilson 15253f9d6ad7SLin Ling if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= 15263f9d6ad7SLin Ling scn->scn_phys.scn_ddt_class_max) { 15273f9d6ad7SLin Ling zfs_dbgmsg("doing scan sync txg %llu; " 15283f9d6ad7SLin Ling "ddt bm=%llu/%llu/%llu/%llx", 15293f9d6ad7SLin Ling (longlong_t)tx->tx_txg, 15303f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class, 15313f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type, 15323f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum, 15333f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor); 15343f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0); 15353f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0); 15363f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0); 15373f9d6ad7SLin Ling ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0); 15383f9d6ad7SLin Ling } else { 15393f9d6ad7SLin Ling zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu", 15403f9d6ad7SLin Ling (longlong_t)tx->tx_txg, 15413f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_objset, 15423f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_object, 15433f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_level, 15443f9d6ad7SLin Ling (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid); 15453f9d6ad7SLin Ling } 15463f9d6ad7SLin Ling 1547cde58dbcSMatthew Ahrens scn->scn_zio_root = zio_root(dp->dp_spa, NULL, 15483f9d6ad7SLin Ling NULL, ZIO_FLAG_CANFAIL); 15493b2aab18SMatthew Ahrens dsl_pool_config_enter(dp, FTAG); 15503f9d6ad7SLin Ling dsl_scan_visit(scn, tx); 15513b2aab18SMatthew Ahrens dsl_pool_config_exit(dp, FTAG); 1552cde58dbcSMatthew Ahrens (void) zio_wait(scn->scn_zio_root); 1553cde58dbcSMatthew Ahrens scn->scn_zio_root = NULL; 15543f9d6ad7SLin Ling 15553f9d6ad7SLin Ling zfs_dbgmsg("visited %llu blocks in %llums", 15563f9d6ad7SLin Ling (longlong_t)scn->scn_visited_this_txg, 15570689f76cSAdam Leventhal (longlong_t)NSEC2MSEC(gethrtime() - scn->scn_sync_start_time)); 15583f9d6ad7SLin Ling 15593f9d6ad7SLin Ling if (!scn->scn_pausing) { 1560b4952e17SGeorge Wilson scn->scn_done_txg = tx->tx_txg + 1; 1561b4952e17SGeorge Wilson zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu", 1562b4952e17SGeorge Wilson tx->tx_txg, scn->scn_done_txg); 15633f9d6ad7SLin Ling } 15643f9d6ad7SLin Ling 15653f9d6ad7SLin Ling if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { 15663f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 15673f9d6ad7SLin Ling while (spa->spa_scrub_inflight > 0) { 15683f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, 15693f9d6ad7SLin Ling &spa->spa_scrub_lock); 15703f9d6ad7SLin Ling } 15713f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 15723f9d6ad7SLin Ling } 15733f9d6ad7SLin Ling 15743f9d6ad7SLin Ling dsl_scan_sync_state(scn, tx); 15753f9d6ad7SLin Ling } 15763f9d6ad7SLin Ling 15773f9d6ad7SLin Ling /* 15783f9d6ad7SLin Ling * This will start a new scan, or restart an existing one. 15793f9d6ad7SLin Ling */ 15803f9d6ad7SLin Ling void 15813f9d6ad7SLin Ling dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) 15823f9d6ad7SLin Ling { 15833f9d6ad7SLin Ling if (txg == 0) { 15843f9d6ad7SLin Ling dmu_tx_t *tx; 15853f9d6ad7SLin Ling tx = dmu_tx_create_dd(dp->dp_mos_dir); 15863f9d6ad7SLin Ling VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); 15873f9d6ad7SLin Ling 15883f9d6ad7SLin Ling txg = dmu_tx_get_txg(tx); 15893f9d6ad7SLin Ling dp->dp_scan->scn_restart_txg = txg; 15903f9d6ad7SLin Ling dmu_tx_commit(tx); 15913f9d6ad7SLin Ling } else { 15923f9d6ad7SLin Ling dp->dp_scan->scn_restart_txg = txg; 15933f9d6ad7SLin Ling } 15943f9d6ad7SLin Ling zfs_dbgmsg("restarting resilver txg=%llu", txg); 15953f9d6ad7SLin Ling } 15963f9d6ad7SLin Ling 15973f9d6ad7SLin Ling boolean_t 15983f9d6ad7SLin Ling dsl_scan_resilvering(dsl_pool_t *dp) 15993f9d6ad7SLin Ling { 16003f9d6ad7SLin Ling return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING && 16013f9d6ad7SLin Ling dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); 16023f9d6ad7SLin Ling } 16033f9d6ad7SLin Ling 16043f9d6ad7SLin Ling /* 16053f9d6ad7SLin Ling * scrub consumers 16063f9d6ad7SLin Ling */ 16073f9d6ad7SLin Ling 16083f9d6ad7SLin Ling static void 16093f9d6ad7SLin Ling count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) 16103f9d6ad7SLin Ling { 16113f9d6ad7SLin Ling int i; 16123f9d6ad7SLin Ling 16133f9d6ad7SLin Ling /* 16143f9d6ad7SLin Ling * If we resume after a reboot, zab will be NULL; don't record 16153f9d6ad7SLin Ling * incomplete stats in that case. 16163f9d6ad7SLin Ling */ 16173f9d6ad7SLin Ling if (zab == NULL) 16183f9d6ad7SLin Ling return; 16193f9d6ad7SLin Ling 16203f9d6ad7SLin Ling for (i = 0; i < 4; i++) { 16213f9d6ad7SLin Ling int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; 16223f9d6ad7SLin Ling int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; 1623ad135b5dSChristopher Siden if (t & DMU_OT_NEWTYPE) 1624ad135b5dSChristopher Siden t = DMU_OT_OTHER; 16253f9d6ad7SLin Ling zfs_blkstat_t *zb = &zab->zab_type[l][t]; 16263f9d6ad7SLin Ling int equal; 16273f9d6ad7SLin Ling 16283f9d6ad7SLin Ling zb->zb_count++; 16293f9d6ad7SLin Ling zb->zb_asize += BP_GET_ASIZE(bp); 16303f9d6ad7SLin Ling zb->zb_lsize += BP_GET_LSIZE(bp); 16313f9d6ad7SLin Ling zb->zb_psize += BP_GET_PSIZE(bp); 16323f9d6ad7SLin Ling zb->zb_gangs += BP_COUNT_GANG(bp); 16333f9d6ad7SLin Ling 16343f9d6ad7SLin Ling switch (BP_GET_NDVAS(bp)) { 16353f9d6ad7SLin Ling case 2: 16363f9d6ad7SLin Ling if (DVA_GET_VDEV(&bp->blk_dva[0]) == 16373f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[1])) 16383f9d6ad7SLin Ling zb->zb_ditto_2_of_2_samevdev++; 16393f9d6ad7SLin Ling break; 16403f9d6ad7SLin Ling case 3: 16413f9d6ad7SLin Ling equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == 16423f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[1])) + 16433f9d6ad7SLin Ling (DVA_GET_VDEV(&bp->blk_dva[0]) == 16443f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[2])) + 16453f9d6ad7SLin Ling (DVA_GET_VDEV(&bp->blk_dva[1]) == 16463f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[2])); 16473f9d6ad7SLin Ling if (equal == 1) 16483f9d6ad7SLin Ling zb->zb_ditto_2_of_3_samevdev++; 16493f9d6ad7SLin Ling else if (equal == 3) 16503f9d6ad7SLin Ling zb->zb_ditto_3_of_3_samevdev++; 16513f9d6ad7SLin Ling break; 16523f9d6ad7SLin Ling } 16533f9d6ad7SLin Ling } 16543f9d6ad7SLin Ling } 16553f9d6ad7SLin Ling 16563f9d6ad7SLin Ling static void 16573f9d6ad7SLin Ling dsl_scan_scrub_done(zio_t *zio) 16583f9d6ad7SLin Ling { 16593f9d6ad7SLin Ling spa_t *spa = zio->io_spa; 16603f9d6ad7SLin Ling 16613f9d6ad7SLin Ling zio_data_buf_free(zio->io_data, zio->io_size); 16623f9d6ad7SLin Ling 16633f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 16643f9d6ad7SLin Ling spa->spa_scrub_inflight--; 16653f9d6ad7SLin Ling cv_broadcast(&spa->spa_scrub_io_cv); 16663f9d6ad7SLin Ling 16673f9d6ad7SLin Ling if (zio->io_error && (zio->io_error != ECKSUM || 16683f9d6ad7SLin Ling !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { 16693f9d6ad7SLin Ling spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++; 16703f9d6ad7SLin Ling } 16713f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 16723f9d6ad7SLin Ling } 16733f9d6ad7SLin Ling 16743f9d6ad7SLin Ling static int 16753f9d6ad7SLin Ling dsl_scan_scrub_cb(dsl_pool_t *dp, 1676*7802d7bfSMatthew Ahrens const blkptr_t *bp, const zbookmark_phys_t *zb) 16773f9d6ad7SLin Ling { 16783f9d6ad7SLin Ling dsl_scan_t *scn = dp->dp_scan; 16793f9d6ad7SLin Ling size_t size = BP_GET_PSIZE(bp); 16803f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 16813f9d6ad7SLin Ling uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); 16823f9d6ad7SLin Ling boolean_t needs_io; 168344ecc532SGeorge Wilson int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; 168444ecc532SGeorge Wilson int scan_delay = 0; 16853f9d6ad7SLin Ling 16863f9d6ad7SLin Ling if (phys_birth <= scn->scn_phys.scn_min_txg || 16873f9d6ad7SLin Ling phys_birth >= scn->scn_phys.scn_max_txg) 16883f9d6ad7SLin Ling return (0); 16893f9d6ad7SLin Ling 16903f9d6ad7SLin Ling count_block(dp->dp_blkstats, bp); 16913f9d6ad7SLin Ling 16925d7b4d43SMatthew Ahrens if (BP_IS_EMBEDDED(bp)) 16935d7b4d43SMatthew Ahrens return (0); 16945d7b4d43SMatthew Ahrens 16953f9d6ad7SLin Ling ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); 16963f9d6ad7SLin Ling if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { 16973f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_SCRUB; 16983f9d6ad7SLin Ling needs_io = B_TRUE; 169944ecc532SGeorge Wilson scan_delay = zfs_scrub_delay; 1700d5285caeSGeorge Wilson } else { 1701d5285caeSGeorge Wilson ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER); 17023f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_RESILVER; 17033f9d6ad7SLin Ling needs_io = B_FALSE; 170444ecc532SGeorge Wilson scan_delay = zfs_resilver_delay; 17053f9d6ad7SLin Ling } 17063f9d6ad7SLin Ling 17073f9d6ad7SLin Ling /* If it's an intent log block, failure is expected. */ 17083f9d6ad7SLin Ling if (zb->zb_level == ZB_ZIL_LEVEL) 17093f9d6ad7SLin Ling zio_flags |= ZIO_FLAG_SPECULATIVE; 17103f9d6ad7SLin Ling 17113f9d6ad7SLin Ling for (int d = 0; d < BP_GET_NDVAS(bp); d++) { 17123f9d6ad7SLin Ling vdev_t *vd = vdev_lookup_top(spa, 17133f9d6ad7SLin Ling DVA_GET_VDEV(&bp->blk_dva[d])); 17143f9d6ad7SLin Ling 17153f9d6ad7SLin Ling /* 17163f9d6ad7SLin Ling * Keep track of how much data we've examined so that 17173f9d6ad7SLin Ling * zpool(1M) status can make useful progress reports. 17183f9d6ad7SLin Ling */ 17193f9d6ad7SLin Ling scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]); 17203f9d6ad7SLin Ling spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]); 17213f9d6ad7SLin Ling 17223f9d6ad7SLin Ling /* if it's a resilver, this may not be in the target range */ 17233f9d6ad7SLin Ling if (!needs_io) { 17243f9d6ad7SLin Ling if (DVA_GET_GANG(&bp->blk_dva[d])) { 17253f9d6ad7SLin Ling /* 17263f9d6ad7SLin Ling * Gang members may be spread across multiple 17273f9d6ad7SLin Ling * vdevs, so the best estimate we have is the 17283f9d6ad7SLin Ling * scrub range, which has already been checked. 17293f9d6ad7SLin Ling * XXX -- it would be better to change our 17303f9d6ad7SLin Ling * allocation policy to ensure that all 17313f9d6ad7SLin Ling * gang members reside on the same vdev. 17323f9d6ad7SLin Ling */ 17333f9d6ad7SLin Ling needs_io = B_TRUE; 17343f9d6ad7SLin Ling } else { 17353f9d6ad7SLin Ling needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, 17363f9d6ad7SLin Ling phys_birth, 1); 17373f9d6ad7SLin Ling } 17383f9d6ad7SLin Ling } 17393f9d6ad7SLin Ling } 17403f9d6ad7SLin Ling 17413f9d6ad7SLin Ling if (needs_io && !zfs_no_scrub_io) { 174244ecc532SGeorge Wilson vdev_t *rvd = spa->spa_root_vdev; 174344ecc532SGeorge Wilson uint64_t maxinflight = rvd->vdev_children * zfs_top_maxinflight; 17443f9d6ad7SLin Ling void *data = zio_data_buf_alloc(size); 17453f9d6ad7SLin Ling 17463f9d6ad7SLin Ling mutex_enter(&spa->spa_scrub_lock); 174744ecc532SGeorge Wilson while (spa->spa_scrub_inflight >= maxinflight) 17483f9d6ad7SLin Ling cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 17493f9d6ad7SLin Ling spa->spa_scrub_inflight++; 17503f9d6ad7SLin Ling mutex_exit(&spa->spa_scrub_lock); 17513f9d6ad7SLin Ling 175244ecc532SGeorge Wilson /* 175344ecc532SGeorge Wilson * If we're seeing recent (zfs_scan_idle) "important" I/Os 175444ecc532SGeorge Wilson * then throttle our workload to limit the impact of a scan. 175544ecc532SGeorge Wilson */ 175644ecc532SGeorge Wilson if (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle) 175744ecc532SGeorge Wilson delay(scan_delay); 175844ecc532SGeorge Wilson 17593f9d6ad7SLin Ling zio_nowait(zio_read(NULL, spa, bp, data, size, 176069962b56SMatthew Ahrens dsl_scan_scrub_done, NULL, ZIO_PRIORITY_SCRUB, 17613f9d6ad7SLin Ling zio_flags, zb)); 17623f9d6ad7SLin Ling } 17633f9d6ad7SLin Ling 17643f9d6ad7SLin Ling /* do not relocate this block */ 17653f9d6ad7SLin Ling return (0); 17663f9d6ad7SLin Ling } 17673f9d6ad7SLin Ling 17683f9d6ad7SLin Ling int 17693f9d6ad7SLin Ling dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) 17703f9d6ad7SLin Ling { 17713f9d6ad7SLin Ling spa_t *spa = dp->dp_spa; 17723f9d6ad7SLin Ling 17733f9d6ad7SLin Ling /* 17743f9d6ad7SLin Ling * Purge all vdev caches and probe all devices. We do this here 17753f9d6ad7SLin Ling * rather than in sync context because this requires a writer lock 17763f9d6ad7SLin Ling * on the spa_config lock, which we can't do from sync context. The 17773f9d6ad7SLin Ling * spa_scrub_reopen flag indicates that vdev_open() should not 17783f9d6ad7SLin Ling * attempt to start another scrub. 17793f9d6ad7SLin Ling */ 17803f9d6ad7SLin Ling spa_vdev_state_enter(spa, SCL_NONE); 17813f9d6ad7SLin Ling spa->spa_scrub_reopen = B_TRUE; 17823f9d6ad7SLin Ling vdev_reopen(spa->spa_root_vdev); 17833f9d6ad7SLin Ling spa->spa_scrub_reopen = B_FALSE; 17843f9d6ad7SLin Ling (void) spa_vdev_state_exit(spa, NULL, 0); 17853f9d6ad7SLin Ling 17863b2aab18SMatthew Ahrens return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check, 17873b2aab18SMatthew Ahrens dsl_scan_setup_sync, &func, 0)); 17883f9d6ad7SLin Ling } 1789