diff options
Diffstat (limited to 'module/zfs/dsl_scrub.c')
| -rw-r--r-- | module/zfs/dsl_scrub.c | 1043 |
1 files changed, 0 insertions, 1043 deletions
diff --git a/module/zfs/dsl_scrub.c b/module/zfs/dsl_scrub.c deleted file mode 100644 index 03ebb90bb..000000000 --- a/module/zfs/dsl_scrub.c +++ /dev/null @@ -1,1043 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License (the "License"). - * You may not use this file except in compliance with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright 2009 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#include <sys/dsl_pool.h> -#include <sys/dsl_dataset.h> -#include <sys/dsl_prop.h> -#include <sys/dsl_dir.h> -#include <sys/dsl_synctask.h> -#include <sys/dnode.h> -#include <sys/dmu_tx.h> -#include <sys/dmu_objset.h> -#include <sys/arc.h> -#include <sys/zap.h> -#include <sys/zio.h> -#include <sys/zfs_context.h> -#include <sys/fs/zfs.h> -#include <sys/zfs_znode.h> -#include <sys/spa_impl.h> -#include <sys/vdev_impl.h> -#include <sys/zil_impl.h> - -typedef int (scrub_cb_t)(dsl_pool_t *, const blkptr_t *, const zbookmark_t *); - -static scrub_cb_t dsl_pool_scrub_clean_cb; -static dsl_syncfunc_t dsl_pool_scrub_cancel_sync; -static void scrub_visitdnode(dsl_pool_t *dp, dnode_phys_t *dnp, arc_buf_t *buf, - uint64_t objset, uint64_t object); - -int zfs_scrub_min_time = 1; /* scrub for at least 1 sec each txg */ -int zfs_resilver_min_time = 3; /* resilver for at least 3 sec each txg */ -boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ - -extern int zfs_txg_timeout; - -static scrub_cb_t *scrub_funcs[SCRUB_FUNC_NUMFUNCS] = { - NULL, - dsl_pool_scrub_clean_cb -}; - -#define SET_BOOKMARK(zb, objset, object, level, blkid) \ -{ \ - (zb)->zb_objset = objset; \ - (zb)->zb_object = object; \ - (zb)->zb_level = level; \ - (zb)->zb_blkid = blkid; \ -} - -/* ARGSUSED */ -static void -dsl_pool_scrub_setup_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) -{ - dsl_pool_t *dp = arg1; - enum scrub_func *funcp = arg2; - dmu_object_type_t ot = 0; - boolean_t complete = B_FALSE; - - dsl_pool_scrub_cancel_sync(dp, &complete, cr, tx); - - ASSERT(dp->dp_scrub_func == SCRUB_FUNC_NONE); - ASSERT(*funcp > SCRUB_FUNC_NONE); - ASSERT(*funcp < SCRUB_FUNC_NUMFUNCS); - - dp->dp_scrub_min_txg = 0; - dp->dp_scrub_max_txg = tx->tx_txg; - - if (*funcp == SCRUB_FUNC_CLEAN) { - vdev_t *rvd = dp->dp_spa->spa_root_vdev; - - /* rewrite all disk labels */ - vdev_config_dirty(rvd); - - if (vdev_resilver_needed(rvd, - &dp->dp_scrub_min_txg, &dp->dp_scrub_max_txg)) { - spa_event_notify(dp->dp_spa, NULL, - ESC_ZFS_RESILVER_START); - dp->dp_scrub_max_txg = MIN(dp->dp_scrub_max_txg, - tx->tx_txg); - } else { - spa_event_notify(dp->dp_spa, NULL, - ESC_ZFS_SCRUB_START); - } - - /* zero out the scrub stats in all vdev_stat_t's */ - vdev_scrub_stat_update(rvd, - dp->dp_scrub_min_txg ? POOL_SCRUB_RESILVER : - POOL_SCRUB_EVERYTHING, B_FALSE); - - dp->dp_spa->spa_scrub_started = B_TRUE; - } - - /* back to the generic stuff */ - - if (dp->dp_blkstats == NULL) { - dp->dp_blkstats = - kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); - } - bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); - - if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) - ot = DMU_OT_ZAP_OTHER; - - dp->dp_scrub_func = *funcp; - dp->dp_scrub_queue_obj = zap_create(dp->dp_meta_objset, - ot ? ot : DMU_OT_SCRUB_QUEUE, DMU_OT_NONE, 0, tx); - bzero(&dp->dp_scrub_bookmark, sizeof (zbookmark_t)); - dp->dp_scrub_restart = B_FALSE; - dp->dp_spa->spa_scrub_errors = 0; - - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_FUNC, sizeof (uint32_t), 1, - &dp->dp_scrub_func, tx)); - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_QUEUE, sizeof (uint64_t), 1, - &dp->dp_scrub_queue_obj, tx)); - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_MIN_TXG, sizeof (uint64_t), 1, - &dp->dp_scrub_min_txg, tx)); - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_MAX_TXG, sizeof (uint64_t), 1, - &dp->dp_scrub_max_txg, tx)); - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_BOOKMARK, sizeof (uint64_t), 4, - &dp->dp_scrub_bookmark, tx)); - VERIFY(0 == zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_ERRORS, sizeof (uint64_t), 1, - &dp->dp_spa->spa_scrub_errors, tx)); - - spa_history_internal_log(LOG_POOL_SCRUB, dp->dp_spa, tx, cr, - "func=%u mintxg=%llu maxtxg=%llu", - *funcp, dp->dp_scrub_min_txg, dp->dp_scrub_max_txg); -} - -int -dsl_pool_scrub_setup(dsl_pool_t *dp, enum scrub_func func) -{ - return (dsl_sync_task_do(dp, NULL, - dsl_pool_scrub_setup_sync, dp, &func, 0)); -} - -/* ARGSUSED */ -static void -dsl_pool_scrub_cancel_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) -{ - dsl_pool_t *dp = arg1; - boolean_t *completep = arg2; - - if (dp->dp_scrub_func == SCRUB_FUNC_NONE) - return; - - mutex_enter(&dp->dp_scrub_cancel_lock); - - if (dp->dp_scrub_restart) { - dp->dp_scrub_restart = B_FALSE; - *completep = B_FALSE; - } - - /* XXX this is scrub-clean specific */ - mutex_enter(&dp->dp_spa->spa_scrub_lock); - while (dp->dp_spa->spa_scrub_inflight > 0) { - cv_wait(&dp->dp_spa->spa_scrub_io_cv, - &dp->dp_spa->spa_scrub_lock); - } - mutex_exit(&dp->dp_spa->spa_scrub_lock); - dp->dp_spa->spa_scrub_started = B_FALSE; - dp->dp_spa->spa_scrub_active = B_FALSE; - - dp->dp_scrub_func = SCRUB_FUNC_NONE; - VERIFY(0 == dmu_object_free(dp->dp_meta_objset, - dp->dp_scrub_queue_obj, tx)); - dp->dp_scrub_queue_obj = 0; - bzero(&dp->dp_scrub_bookmark, sizeof (zbookmark_t)); - - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_QUEUE, tx)); - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_MIN_TXG, tx)); - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_MAX_TXG, tx)); - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_BOOKMARK, tx)); - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_FUNC, tx)); - VERIFY(0 == zap_remove(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_ERRORS, tx)); - - spa_history_internal_log(LOG_POOL_SCRUB_DONE, dp->dp_spa, tx, cr, - "complete=%u", *completep); - - /* below is scrub-clean specific */ - vdev_scrub_stat_update(dp->dp_spa->spa_root_vdev, POOL_SCRUB_NONE, - *completep); - /* - * If the scrub/resilver completed, update all DTLs to reflect this. - * Whether it succeeded or not, vacate all temporary scrub DTLs. - */ - vdev_dtl_reassess(dp->dp_spa->spa_root_vdev, tx->tx_txg, - *completep ? dp->dp_scrub_max_txg : 0, B_TRUE); - if (*completep) - spa_event_notify(dp->dp_spa, NULL, dp->dp_scrub_min_txg ? - ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH); - spa_errlog_rotate(dp->dp_spa); - - /* - * We may have finished replacing a device. - * Let the async thread assess this and handle the detach. - */ - spa_async_request(dp->dp_spa, SPA_ASYNC_RESILVER_DONE); - - dp->dp_scrub_min_txg = dp->dp_scrub_max_txg = 0; - mutex_exit(&dp->dp_scrub_cancel_lock); -} - -int -dsl_pool_scrub_cancel(dsl_pool_t *dp) -{ - boolean_t complete = B_FALSE; - - return (dsl_sync_task_do(dp, NULL, - dsl_pool_scrub_cancel_sync, dp, &complete, 3)); -} - -int -dsl_free(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp, - zio_done_func_t *done, void *private, uint32_t arc_flags) -{ - /* - * This function will be used by bp-rewrite wad to intercept frees. - */ - return (arc_free(pio, dp->dp_spa, txg, (blkptr_t *)bpp, - done, private, arc_flags)); -} - -static boolean_t -bookmark_is_zero(const zbookmark_t *zb) -{ - return (zb->zb_objset == 0 && zb->zb_object == 0 && - zb->zb_level == 0 && zb->zb_blkid == 0); -} - -/* dnp is the dnode for zb1->zb_object */ -static boolean_t -bookmark_is_before(dnode_phys_t *dnp, const zbookmark_t *zb1, - const zbookmark_t *zb2) -{ - uint64_t zb1nextL0, zb2thisobj; - - ASSERT(zb1->zb_objset == zb2->zb_objset); - ASSERT(zb1->zb_object != -1ULL); - ASSERT(zb2->zb_level == 0); - - /* - * A bookmark in the deadlist is considered to be after - * everything else. - */ - if (zb2->zb_object == -1ULL) - return (B_TRUE); - - /* The objset_phys_t isn't before anything. */ - if (dnp == NULL) - return (B_FALSE); - - zb1nextL0 = (zb1->zb_blkid + 1) << - ((zb1->zb_level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); - - zb2thisobj = zb2->zb_object ? zb2->zb_object : - zb2->zb_blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT); - - if (zb1->zb_object == 0) { - uint64_t nextobj = zb1nextL0 * - (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT) >> DNODE_SHIFT; - return (nextobj <= zb2thisobj); - } - - if (zb1->zb_object < zb2thisobj) - return (B_TRUE); - if (zb1->zb_object > zb2thisobj) - return (B_FALSE); - if (zb2->zb_object == 0) - return (B_FALSE); - return (zb1nextL0 <= zb2->zb_blkid); -} - -static boolean_t -scrub_pause(dsl_pool_t *dp, const zbookmark_t *zb) -{ - int elapsed_ticks; - int mintime; - - if (dp->dp_scrub_pausing) - return (B_TRUE); /* we're already pausing */ - - if (!bookmark_is_zero(&dp->dp_scrub_bookmark)) - return (B_FALSE); /* we're resuming */ - - /* We only know how to resume from level-0 blocks. */ - if (zb->zb_level != 0) - return (B_FALSE); - - mintime = dp->dp_scrub_isresilver ? zfs_resilver_min_time : - zfs_scrub_min_time; - elapsed_ticks = lbolt64 - dp->dp_scrub_start_time; - if (elapsed_ticks > hz * zfs_txg_timeout || - (elapsed_ticks > hz * mintime && txg_sync_waiting(dp))) { - dprintf("pausing at %llx/%llx/%llx/%llx\n", - (longlong_t)zb->zb_objset, (longlong_t)zb->zb_object, - (longlong_t)zb->zb_level, (longlong_t)zb->zb_blkid); - dp->dp_scrub_pausing = B_TRUE; - dp->dp_scrub_bookmark = *zb; - return (B_TRUE); - } - return (B_FALSE); -} - -typedef struct zil_traverse_arg { - dsl_pool_t *zta_dp; - zil_header_t *zta_zh; -} zil_traverse_arg_t; - -/* ARGSUSED */ -static void -traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) -{ - zil_traverse_arg_t *zta = arg; - dsl_pool_t *dp = zta->zta_dp; - zil_header_t *zh = zta->zta_zh; - zbookmark_t zb; - - if (bp->blk_birth <= dp->dp_scrub_min_txg) - return; - - /* - * One block ("stubby") can be allocated a long time ago; we - * want to visit that one because it has been allocated - * (on-disk) even if it hasn't been claimed (even though for - * plain scrub there's nothing to do to it). - */ - if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(dp->dp_spa)) - return; - - zb.zb_objset = zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET]; - zb.zb_object = 0; - zb.zb_level = -1; - zb.zb_blkid = bp->blk_cksum.zc_word[ZIL_ZC_SEQ]; - VERIFY(0 == scrub_funcs[dp->dp_scrub_func](dp, bp, &zb)); -} - -/* ARGSUSED */ -static void -traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) -{ - if (lrc->lrc_txtype == TX_WRITE) { - zil_traverse_arg_t *zta = arg; - dsl_pool_t *dp = zta->zta_dp; - zil_header_t *zh = zta->zta_zh; - lr_write_t *lr = (lr_write_t *)lrc; - blkptr_t *bp = &lr->lr_blkptr; - zbookmark_t zb; - - if (bp->blk_birth <= dp->dp_scrub_min_txg) - return; - - /* - * birth can be < claim_txg if this record's txg is - * already txg sync'ed (but this log block contains - * other records that are not synced) - */ - if (claim_txg == 0 || bp->blk_birth < claim_txg) - return; - - zb.zb_objset = zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET]; - zb.zb_object = lr->lr_foid; - zb.zb_level = BP_GET_LEVEL(bp); - zb.zb_blkid = lr->lr_offset / BP_GET_LSIZE(bp); - VERIFY(0 == scrub_funcs[dp->dp_scrub_func](dp, bp, &zb)); - } -} - -static void -traverse_zil(dsl_pool_t *dp, zil_header_t *zh) -{ - uint64_t claim_txg = zh->zh_claim_txg; - zil_traverse_arg_t zta = { dp, zh }; - zilog_t *zilog; - - /* - * We only want to visit blocks that have been claimed but not yet - * replayed (or, in read-only mode, blocks that *would* be claimed). - */ - if (claim_txg == 0 && spa_writeable(dp->dp_spa)) - return; - - zilog = zil_alloc(dp->dp_meta_objset, zh); - - (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, &zta, - claim_txg); - - zil_free(zilog); -} - -static void -scrub_visitbp(dsl_pool_t *dp, dnode_phys_t *dnp, - arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb) -{ - int err; - arc_buf_t *buf = NULL; - - if (bp->blk_birth <= dp->dp_scrub_min_txg) - return; - - if (scrub_pause(dp, zb)) - return; - - if (!bookmark_is_zero(&dp->dp_scrub_bookmark)) { - /* - * If we already visited this bp & everything below (in - * a prior txg), don't bother doing it again. - */ - if (bookmark_is_before(dnp, zb, &dp->dp_scrub_bookmark)) - return; - - /* - * If we found the block we're trying to resume from, or - * we went past it to a different object, zero it out to - * indicate that it's OK to start checking for pausing - * again. - */ - if (bcmp(zb, &dp->dp_scrub_bookmark, sizeof (*zb)) == 0 || - zb->zb_object > dp->dp_scrub_bookmark.zb_object) { - dprintf("resuming at %llx/%llx/%llx/%llx\n", - (longlong_t)zb->zb_objset, - (longlong_t)zb->zb_object, - (longlong_t)zb->zb_level, - (longlong_t)zb->zb_blkid); - bzero(&dp->dp_scrub_bookmark, sizeof (*zb)); - } - } - - if (BP_GET_LEVEL(bp) > 0) { - uint32_t flags = ARC_WAIT; - int i; - blkptr_t *cbp; - int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; - - err = arc_read(NULL, dp->dp_spa, bp, pbuf, - arc_getbuf_func, &buf, - ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) { - mutex_enter(&dp->dp_spa->spa_scrub_lock); - dp->dp_spa->spa_scrub_errors++; - mutex_exit(&dp->dp_spa->spa_scrub_lock); - return; - } - cbp = buf->b_data; - - for (i = 0; i < epb; i++, cbp++) { - zbookmark_t czb; - - SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, - zb->zb_level - 1, - zb->zb_blkid * epb + i); - scrub_visitbp(dp, dnp, buf, cbp, &czb); - } - } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { - uint32_t flags = ARC_WAIT; - dnode_phys_t *child_dnp; - int i; - int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; - - err = arc_read(NULL, dp->dp_spa, bp, pbuf, - arc_getbuf_func, &buf, - ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) { - mutex_enter(&dp->dp_spa->spa_scrub_lock); - dp->dp_spa->spa_scrub_errors++; - mutex_exit(&dp->dp_spa->spa_scrub_lock); - return; - } - child_dnp = buf->b_data; - - for (i = 0; i < epb; i++, child_dnp++) { - scrub_visitdnode(dp, child_dnp, buf, zb->zb_objset, - zb->zb_blkid * epb + i); - } - } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { - uint32_t flags = ARC_WAIT; - objset_phys_t *osp; - - err = arc_read_nolock(NULL, dp->dp_spa, bp, - arc_getbuf_func, &buf, - ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); - if (err) { - mutex_enter(&dp->dp_spa->spa_scrub_lock); - dp->dp_spa->spa_scrub_errors++; - mutex_exit(&dp->dp_spa->spa_scrub_lock); - return; - } - - osp = buf->b_data; - - traverse_zil(dp, &osp->os_zil_header); - - scrub_visitdnode(dp, &osp->os_meta_dnode, - buf, zb->zb_objset, 0); - if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { - scrub_visitdnode(dp, &osp->os_userused_dnode, - buf, zb->zb_objset, 0); - scrub_visitdnode(dp, &osp->os_groupused_dnode, - buf, zb->zb_objset, 0); - } - } - - (void) scrub_funcs[dp->dp_scrub_func](dp, bp, zb); - if (buf) - (void) arc_buf_remove_ref(buf, &buf); -} - -static void -scrub_visitdnode(dsl_pool_t *dp, dnode_phys_t *dnp, arc_buf_t *buf, - uint64_t objset, uint64_t object) -{ - int j; - - for (j = 0; j < dnp->dn_nblkptr; j++) { - zbookmark_t czb; - - SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); - scrub_visitbp(dp, dnp, buf, &dnp->dn_blkptr[j], &czb); - } - -} - -static void -scrub_visit_rootbp(dsl_pool_t *dp, dsl_dataset_t *ds, blkptr_t *bp) -{ - zbookmark_t zb; - - SET_BOOKMARK(&zb, ds ? ds->ds_object : 0, 0, -1, 0); - scrub_visitbp(dp, NULL, NULL, bp, &zb); -} - -void -dsl_pool_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) -{ - dsl_pool_t *dp = ds->ds_dir->dd_pool; - - if (dp->dp_scrub_func == SCRUB_FUNC_NONE) - return; - - if (dp->dp_scrub_bookmark.zb_objset == ds->ds_object) { - SET_BOOKMARK(&dp->dp_scrub_bookmark, -1, 0, 0, 0); - } else if (zap_remove_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_object, tx) != 0) { - return; - } - - if (ds->ds_phys->ds_next_snap_obj != 0) { - VERIFY(zap_add_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_phys->ds_next_snap_obj, tx) == 0); - } - ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); -} - -void -dsl_pool_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) -{ - dsl_pool_t *dp = ds->ds_dir->dd_pool; - - if (dp->dp_scrub_func == SCRUB_FUNC_NONE) - return; - - ASSERT(ds->ds_phys->ds_prev_snap_obj != 0); - - if (dp->dp_scrub_bookmark.zb_objset == ds->ds_object) { - dp->dp_scrub_bookmark.zb_objset = - ds->ds_phys->ds_prev_snap_obj; - } else if (zap_remove_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_object, tx) == 0) { - VERIFY(zap_add_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_phys->ds_prev_snap_obj, tx) == 0); - } -} - -void -dsl_pool_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) -{ - dsl_pool_t *dp = ds1->ds_dir->dd_pool; - - if (dp->dp_scrub_func == SCRUB_FUNC_NONE) - return; - - if (dp->dp_scrub_bookmark.zb_objset == ds1->ds_object) { - dp->dp_scrub_bookmark.zb_objset = ds2->ds_object; - } else if (dp->dp_scrub_bookmark.zb_objset == ds2->ds_object) { - dp->dp_scrub_bookmark.zb_objset = ds1->ds_object; - } - - if (zap_remove_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds1->ds_object, tx) == 0) { - int err = zap_add_int(dp->dp_meta_objset, - dp->dp_scrub_queue_obj, ds2->ds_object, tx); - VERIFY(err == 0 || err == EEXIST); - if (err == EEXIST) { - /* Both were there to begin with */ - VERIFY(0 == zap_add_int(dp->dp_meta_objset, - dp->dp_scrub_queue_obj, ds1->ds_object, tx)); - } - } else if (zap_remove_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds2->ds_object, tx) == 0) { - VERIFY(0 == zap_add_int(dp->dp_meta_objset, - dp->dp_scrub_queue_obj, ds1->ds_object, tx)); - } -} - -struct enqueue_clones_arg { - dmu_tx_t *tx; - uint64_t originobj; -}; - -/* ARGSUSED */ -static int -enqueue_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) -{ - struct enqueue_clones_arg *eca = arg; - dsl_dataset_t *ds; - int err; - dsl_pool_t *dp; - - err = dsl_dataset_hold_obj(spa->spa_dsl_pool, dsobj, FTAG, &ds); - if (err) - return (err); - dp = ds->ds_dir->dd_pool; - - if (ds->ds_dir->dd_phys->dd_origin_obj == eca->originobj) { - while (ds->ds_phys->ds_prev_snap_obj != eca->originobj) { - dsl_dataset_t *prev; - err = dsl_dataset_hold_obj(dp, - ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); - - dsl_dataset_rele(ds, FTAG); - if (err) - return (err); - ds = prev; - } - VERIFY(zap_add_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_object, eca->tx) == 0); - } - dsl_dataset_rele(ds, FTAG); - return (0); -} - -static void -scrub_visitds(dsl_pool_t *dp, uint64_t dsobj, dmu_tx_t *tx) -{ - dsl_dataset_t *ds; - uint64_t min_txg_save; - - VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); - - /* - * Iterate over the bps in this ds. - */ - min_txg_save = dp->dp_scrub_min_txg; - dp->dp_scrub_min_txg = - MAX(dp->dp_scrub_min_txg, ds->ds_phys->ds_prev_snap_txg); - scrub_visit_rootbp(dp, ds, &ds->ds_phys->ds_bp); - dp->dp_scrub_min_txg = min_txg_save; - - if (dp->dp_scrub_pausing) - goto out; - - /* - * Add descendent datasets to work queue. - */ - if (ds->ds_phys->ds_next_snap_obj != 0) { - VERIFY(zap_add_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_phys->ds_next_snap_obj, tx) == 0); - } - if (ds->ds_phys->ds_num_children > 1) { - if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { - struct enqueue_clones_arg eca; - eca.tx = tx; - eca.originobj = ds->ds_object; - - (void) dmu_objset_find_spa(ds->ds_dir->dd_pool->dp_spa, - NULL, enqueue_clones_cb, &eca, DS_FIND_CHILDREN); - } else { - VERIFY(zap_join(dp->dp_meta_objset, - ds->ds_phys->ds_next_clones_obj, - dp->dp_scrub_queue_obj, tx) == 0); - } - } - -out: - dsl_dataset_rele(ds, FTAG); -} - -/* ARGSUSED */ -static int -enqueue_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) -{ - dmu_tx_t *tx = arg; - dsl_dataset_t *ds; - int err; - dsl_pool_t *dp; - - err = dsl_dataset_hold_obj(spa->spa_dsl_pool, dsobj, FTAG, &ds); - if (err) - return (err); - - dp = ds->ds_dir->dd_pool; - - while (ds->ds_phys->ds_prev_snap_obj != 0) { - dsl_dataset_t *prev; - err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, - FTAG, &prev); - if (err) { - dsl_dataset_rele(ds, FTAG); - return (err); - } - - /* - * If this is a clone, we don't need to worry about it for now. - */ - if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { - dsl_dataset_rele(ds, FTAG); - dsl_dataset_rele(prev, FTAG); - return (0); - } - dsl_dataset_rele(ds, FTAG); - ds = prev; - } - - VERIFY(zap_add_int(dp->dp_meta_objset, dp->dp_scrub_queue_obj, - ds->ds_object, tx) == 0); - dsl_dataset_rele(ds, FTAG); - return (0); -} - -void -dsl_pool_scrub_sync(dsl_pool_t *dp, dmu_tx_t *tx) -{ - spa_t *spa = dp->dp_spa; - zap_cursor_t zc; - zap_attribute_t za; - boolean_t complete = B_TRUE; - - if (dp->dp_scrub_func == SCRUB_FUNC_NONE) - return; - - /* - * If the pool is not loaded, or is trying to unload, leave it alone. - */ - if (spa->spa_load_state != SPA_LOAD_NONE || spa_shutting_down(spa)) - return; - - if (dp->dp_scrub_restart) { - enum scrub_func func = dp->dp_scrub_func; - dp->dp_scrub_restart = B_FALSE; - dsl_pool_scrub_setup_sync(dp, &func, kcred, tx); - } - - if (spa->spa_root_vdev->vdev_stat.vs_scrub_type == 0) { - /* - * We must have resumed after rebooting; reset the vdev - * stats to know that we're doing a scrub (although it - * will think we're just starting now). - */ - vdev_scrub_stat_update(spa->spa_root_vdev, - dp->dp_scrub_min_txg ? POOL_SCRUB_RESILVER : - POOL_SCRUB_EVERYTHING, B_FALSE); - } - - dp->dp_scrub_pausing = B_FALSE; - dp->dp_scrub_start_time = lbolt64; - dp->dp_scrub_isresilver = (dp->dp_scrub_min_txg != 0); - spa->spa_scrub_active = B_TRUE; - - if (dp->dp_scrub_bookmark.zb_objset == 0) { - /* First do the MOS & ORIGIN */ - scrub_visit_rootbp(dp, NULL, &dp->dp_meta_rootbp); - if (dp->dp_scrub_pausing) - goto out; - - if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) { - VERIFY(0 == dmu_objset_find_spa(spa, - NULL, enqueue_cb, tx, DS_FIND_CHILDREN)); - } else { - scrub_visitds(dp, dp->dp_origin_snap->ds_object, tx); - } - ASSERT(!dp->dp_scrub_pausing); - } else if (dp->dp_scrub_bookmark.zb_objset != -1ULL) { - /* - * If we were paused, continue from here. Note if the - * ds we were paused on was deleted, the zb_objset will - * be -1, so we will skip this and find a new objset - * below. - */ - scrub_visitds(dp, dp->dp_scrub_bookmark.zb_objset, tx); - if (dp->dp_scrub_pausing) - goto out; - } - - /* - * In case we were paused right at the end of the ds, zero the - * bookmark so we don't think that we're still trying to resume. - */ - bzero(&dp->dp_scrub_bookmark, sizeof (zbookmark_t)); - - /* keep pulling things out of the zap-object-as-queue */ - while (zap_cursor_init(&zc, dp->dp_meta_objset, dp->dp_scrub_queue_obj), - zap_cursor_retrieve(&zc, &za) == 0) { - VERIFY(0 == zap_remove(dp->dp_meta_objset, - dp->dp_scrub_queue_obj, za.za_name, tx)); - scrub_visitds(dp, za.za_first_integer, tx); - if (dp->dp_scrub_pausing) - break; - zap_cursor_fini(&zc); - } - zap_cursor_fini(&zc); - if (dp->dp_scrub_pausing) - goto out; - - /* done. */ - - dsl_pool_scrub_cancel_sync(dp, &complete, kcred, tx); - return; -out: - VERIFY(0 == zap_update(dp->dp_meta_objset, - DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_BOOKMARK, sizeof (uint64_t), 4, - &dp->dp_scrub_bookmark, tx)); - VERIFY(0 == zap_update(dp->dp_meta_objset, - DMU_POOL_DIRECTORY_OBJECT, - DMU_POOL_SCRUB_ERRORS, sizeof (uint64_t), 1, - &spa->spa_scrub_errors, tx)); - - /* XXX this is scrub-clean specific */ - mutex_enter(&spa->spa_scrub_lock); - while (spa->spa_scrub_inflight > 0) - cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); - mutex_exit(&spa->spa_scrub_lock); -} - -void -dsl_pool_scrub_restart(dsl_pool_t *dp) -{ - mutex_enter(&dp->dp_scrub_cancel_lock); - dp->dp_scrub_restart = B_TRUE; - mutex_exit(&dp->dp_scrub_cancel_lock); -} - -/* - * scrub consumers - */ - -static void -count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp) -{ - int i; - - /* - * If we resume after a reboot, zab will be NULL; don't record - * incomplete stats in that case. - */ - if (zab == NULL) - return; - - for (i = 0; i < 4; i++) { - int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; - int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; - zfs_blkstat_t *zb = &zab->zab_type[l][t]; - int equal; - - zb->zb_count++; - zb->zb_asize += BP_GET_ASIZE(bp); - zb->zb_lsize += BP_GET_LSIZE(bp); - zb->zb_psize += BP_GET_PSIZE(bp); - zb->zb_gangs += BP_COUNT_GANG(bp); - - switch (BP_GET_NDVAS(bp)) { - case 2: - if (DVA_GET_VDEV(&bp->blk_dva[0]) == - DVA_GET_VDEV(&bp->blk_dva[1])) - zb->zb_ditto_2_of_2_samevdev++; - break; - case 3: - equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == - DVA_GET_VDEV(&bp->blk_dva[1])) + - (DVA_GET_VDEV(&bp->blk_dva[0]) == - DVA_GET_VDEV(&bp->blk_dva[2])) + - (DVA_GET_VDEV(&bp->blk_dva[1]) == - DVA_GET_VDEV(&bp->blk_dva[2])); - if (equal == 1) - zb->zb_ditto_2_of_3_samevdev++; - else if (equal == 3) - zb->zb_ditto_3_of_3_samevdev++; - break; - } - } -} - -static void -dsl_pool_scrub_clean_done(zio_t *zio) -{ - spa_t *spa = zio->io_spa; - - zio_data_buf_free(zio->io_data, zio->io_size); - - mutex_enter(&spa->spa_scrub_lock); - spa->spa_scrub_inflight--; - cv_broadcast(&spa->spa_scrub_io_cv); - - if (zio->io_error && (zio->io_error != ECKSUM || - !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) - spa->spa_scrub_errors++; - mutex_exit(&spa->spa_scrub_lock); -} - -static int -dsl_pool_scrub_clean_cb(dsl_pool_t *dp, - const blkptr_t *bp, const zbookmark_t *zb) -{ - size_t size = BP_GET_PSIZE(bp); - spa_t *spa = dp->dp_spa; - boolean_t needs_io; - int zio_flags = ZIO_FLAG_SCRUB_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; - int zio_priority; - - ASSERT(bp->blk_birth > dp->dp_scrub_min_txg); - - if (bp->blk_birth >= dp->dp_scrub_max_txg) - return (0); - - count_block(dp->dp_blkstats, bp); - - if (dp->dp_scrub_isresilver == 0) { - /* It's a scrub */ - zio_flags |= ZIO_FLAG_SCRUB; - zio_priority = ZIO_PRIORITY_SCRUB; - needs_io = B_TRUE; - } else { - /* It's a resilver */ - zio_flags |= ZIO_FLAG_RESILVER; - zio_priority = ZIO_PRIORITY_RESILVER; - needs_io = B_FALSE; - } - - /* If it's an intent log block, failure is expected. */ - if (zb->zb_level == -1 && BP_GET_TYPE(bp) != DMU_OT_OBJSET) - zio_flags |= ZIO_FLAG_SPECULATIVE; - - for (int d = 0; d < BP_GET_NDVAS(bp); d++) { - vdev_t *vd = vdev_lookup_top(spa, - DVA_GET_VDEV(&bp->blk_dva[d])); - - /* - * Keep track of how much data we've examined so that - * zpool(1M) status can make useful progress reports. - */ - mutex_enter(&vd->vdev_stat_lock); - vd->vdev_stat.vs_scrub_examined += - DVA_GET_ASIZE(&bp->blk_dva[d]); - mutex_exit(&vd->vdev_stat_lock); - - /* if it's a resilver, this may not be in the target range */ - if (!needs_io) { - if (DVA_GET_GANG(&bp->blk_dva[d])) { - /* - * Gang members may be spread across multiple - * vdevs, so the best estimate we have is the - * scrub range, which has already been checked. - * XXX -- it would be better to change our - * allocation policy to ensure that all - * gang members reside on the same vdev. - */ - needs_io = B_TRUE; - } else { - needs_io = vdev_dtl_contains(vd, DTL_PARTIAL, - bp->blk_birth, 1); - } - } - } - - if (needs_io && !zfs_no_scrub_io) { - void *data = zio_data_buf_alloc(size); - - mutex_enter(&spa->spa_scrub_lock); - while (spa->spa_scrub_inflight >= spa->spa_scrub_maxinflight) - cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); - spa->spa_scrub_inflight++; - mutex_exit(&spa->spa_scrub_lock); - - zio_nowait(zio_read(NULL, spa, bp, data, size, - dsl_pool_scrub_clean_done, NULL, zio_priority, - zio_flags, zb)); - } - - /* do not relocate this block */ - return (0); -} - -int -dsl_pool_scrub_clean(dsl_pool_t *dp) -{ - spa_t *spa = dp->dp_spa; - - /* - * Purge all vdev caches. We do this here rather than in sync - * context because this requires a writer lock on the spa_config - * lock, which we can't do from sync context. The - * spa_scrub_reopen flag indicates that vdev_open() should not - * attempt to start another scrub. - */ - spa_vdev_state_enter(spa); - spa->spa_scrub_reopen = B_TRUE; - vdev_reopen(spa->spa_root_vdev); - spa->spa_scrub_reopen = B_FALSE; - (void) spa_vdev_state_exit(spa, NULL, 0); - - return (dsl_pool_scrub_setup(dp, SCRUB_FUNC_CLEAN)); -} |