/* * 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 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static dsl_checkfunc_t dsl_dataset_destroy_begin_check; static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; static dsl_checkfunc_t dsl_dataset_rollback_check; static dsl_syncfunc_t dsl_dataset_rollback_sync; static dsl_syncfunc_t dsl_dataset_set_reservation_sync; #define DS_REF_MAX (1ULL << 62) #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE /* * We use weighted reference counts to express the various forms of exclusion * between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open * is DS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE. * This makes the exclusion logic simple: the total refcnt for all opens cannot * exceed DS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their * weight (DS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume * just over half of the refcnt space, so there can't be more than one, but it * can peacefully coexist with any number of STANDARD opens. */ static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = { 0, /* DS_MODE_NONE - invalid */ 1, /* DS_MODE_STANDARD - unlimited number */ (DS_REF_MAX >> 1) + 1, /* DS_MODE_PRIMARY - only one of these */ DS_REF_MAX /* DS_MODE_EXCLUSIVE - no other opens */ }; /* * Figure out how much of this delta should be propogated to the dsl_dir * layer. If there's a refreservation, that space has already been * partially accounted for in our ancestors. */ static int64_t parent_delta(dsl_dataset_t *ds, int64_t delta) { uint64_t old_bytes, new_bytes; if (ds->ds_reserved == 0) return (delta); old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); return (new_bytes - old_bytes); } void dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) { int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); int compressed = BP_GET_PSIZE(bp); int uncompressed = BP_GET_UCSIZE(bp); int64_t delta; dprintf_bp(bp, "born, ds=%p\n", ds); ASSERT(dmu_tx_is_syncing(tx)); /* It could have been compressed away to nothing */ if (BP_IS_HOLE(bp)) return; ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); if (ds == NULL) { /* * Account for the meta-objset space in its placeholder * dsl_dir. */ ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, used, compressed, uncompressed, tx); dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); return; } dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); delta = parent_delta(ds, used); ds->ds_phys->ds_used_bytes += used; ds->ds_phys->ds_compressed_bytes += compressed; ds->ds_phys->ds_uncompressed_bytes += uncompressed; ds->ds_phys->ds_unique_bytes += used; mutex_exit(&ds->ds_lock); dsl_dir_diduse_space(ds->ds_dir, delta, compressed, uncompressed, tx); } void dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, dmu_tx_t *tx) { int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); int compressed = BP_GET_PSIZE(bp); int uncompressed = BP_GET_UCSIZE(bp); ASSERT(dmu_tx_is_syncing(tx)); /* No block pointer => nothing to free */ if (BP_IS_HOLE(bp)) return; ASSERT(used > 0); if (ds == NULL) { int err; /* * Account for the meta-objset space in its placeholder * dataset. */ err = arc_free(pio, tx->tx_pool->dp_spa, tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); ASSERT(err == 0); dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, -used, -compressed, -uncompressed, tx); dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); return; } ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); dmu_buf_will_dirty(ds->ds_dbuf, tx); if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { int err; int64_t delta; dprintf_bp(bp, "freeing: %s", ""); err = arc_free(pio, tx->tx_pool->dp_spa, tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); ASSERT(err == 0); mutex_enter(&ds->ds_lock); ASSERT(ds->ds_phys->ds_unique_bytes >= used || !DS_UNIQUE_IS_ACCURATE(ds)); delta = parent_delta(ds, -used); ds->ds_phys->ds_unique_bytes -= used; mutex_exit(&ds->ds_lock); dsl_dir_diduse_space(ds->ds_dir, delta, -compressed, -uncompressed, tx); } else { dprintf_bp(bp, "putting on dead list: %s", ""); VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object && bp->blk_birth > ds->ds_prev->ds_phys->ds_prev_snap_txg) { dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); mutex_enter(&ds->ds_prev->ds_lock); ds->ds_prev->ds_phys->ds_unique_bytes += used; mutex_exit(&ds->ds_prev->ds_lock); } } mutex_enter(&ds->ds_lock); ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); ds->ds_phys->ds_used_bytes -= used; ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); ds->ds_phys->ds_compressed_bytes -= compressed; ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); ds->ds_phys->ds_uncompressed_bytes -= uncompressed; mutex_exit(&ds->ds_lock); } uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) { uint64_t trysnap = 0; if (ds == NULL) return (0); /* * The snapshot creation could fail, but that would cause an * incorrect FALSE return, which would only result in an * overestimation of the amount of space that an operation would * consume, which is OK. * * There's also a small window where we could miss a pending * snapshot, because we could set the sync task in the quiescing * phase. So this should only be used as a guess. */ if (ds->ds_trysnap_txg > spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) trysnap = ds->ds_trysnap_txg; return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); } int dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) { return (blk_birth > dsl_dataset_prev_snap_txg(ds)); } /* ARGSUSED */ static void dsl_dataset_evict(dmu_buf_t *db, void *dsv) { dsl_dataset_t *ds = dsv; /* open_refcount == DS_REF_MAX when deleting */ ASSERT(ds->ds_open_refcount == 0 || ds->ds_open_refcount == DS_REF_MAX); dprintf_ds(ds, "evicting %s\n", ""); unique_remove(ds->ds_fsid_guid); if (ds->ds_user_ptr != NULL) ds->ds_user_evict_func(ds, ds->ds_user_ptr); if (ds->ds_prev) { dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); ds->ds_prev = NULL; } bplist_close(&ds->ds_deadlist); dsl_dir_close(ds->ds_dir, ds); ASSERT(!list_link_active(&ds->ds_synced_link)); mutex_destroy(&ds->ds_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_deadlist.bpl_lock); kmem_free(ds, sizeof (dsl_dataset_t)); } static int dsl_dataset_get_snapname(dsl_dataset_t *ds) { dsl_dataset_phys_t *headphys; int err; dmu_buf_t *headdbuf; dsl_pool_t *dp = ds->ds_dir->dd_pool; objset_t *mos = dp->dp_meta_objset; if (ds->ds_snapname[0]) return (0); if (ds->ds_phys->ds_next_snap_obj == 0) return (0); err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &headdbuf); if (err) return (err); headphys = headdbuf->db_data; err = zap_value_search(dp->dp_meta_objset, headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); dmu_buf_rele(headdbuf, FTAG); return (err); } static int dsl_dataset_snap_lookup(objset_t *os, uint64_t flags, uint64_t snapnames_zapobj, const char *name, uint64_t *value) { matchtype_t mt; int err; if (flags & DS_FLAG_CI_DATASET) mt = MT_FIRST; else mt = MT_EXACT; err = zap_lookup_norm(os, snapnames_zapobj, name, 8, 1, value, mt, NULL, 0, NULL); if (err == ENOTSUP && mt == MT_FIRST) err = zap_lookup(os, snapnames_zapobj, name, 8, 1, value); return (err); } static int dsl_dataset_snap_remove(objset_t *os, uint64_t flags, uint64_t snapnames_zapobj, char *name, dmu_tx_t *tx) { matchtype_t mt; int err; if (flags & DS_FLAG_CI_DATASET) mt = MT_FIRST; else mt = MT_EXACT; err = zap_remove_norm(os, snapnames_zapobj, name, mt, tx); if (err == ENOTSUP && mt == MT_FIRST) err = zap_remove(os, snapnames_zapobj, name, tx); return (err); } int dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, int mode, void *tag, dsl_dataset_t **dsp) { uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; objset_t *mos = dp->dp_meta_objset; dmu_buf_t *dbuf; dsl_dataset_t *ds; int err; ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || dsl_pool_sync_context(dp)); err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); if (err) return (err); ds = dmu_buf_get_user(dbuf); if (ds == NULL) { dsl_dataset_t *winner; ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); ds->ds_dbuf = dbuf; ds->ds_object = dsobj; ds->ds_phys = dbuf->db_data; mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, NULL); err = bplist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj); if (err == 0) { err = dsl_dir_open_obj(dp, ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); } if (err) { /* * we don't really need to close the blist if we * just opened it. */ mutex_destroy(&ds->ds_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_deadlist.bpl_lock); kmem_free(ds, sizeof (dsl_dataset_t)); dmu_buf_rele(dbuf, tag); return (err); } if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { ds->ds_snapname[0] = '\0'; if (ds->ds_phys->ds_prev_snap_obj) { err = dsl_dataset_open_obj(dp, ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_NONE, ds, &ds->ds_prev); } } else { if (snapname) { #ifdef ZFS_DEBUG dsl_dataset_phys_t *headphys; dmu_buf_t *headdbuf; err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &headdbuf); if (err == 0) { uint64_t foundobj; headphys = headdbuf->db_data; err = dsl_dataset_snap_lookup( dp->dp_meta_objset, headphys->ds_flags, headphys->ds_snapnames_zapobj, snapname, &foundobj); ASSERT3U(foundobj, ==, dsobj); dmu_buf_rele(headdbuf, FTAG); } #endif (void) strcat(ds->ds_snapname, snapname); } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { err = dsl_dataset_get_snapname(ds); } } if (!dsl_dataset_is_snapshot(ds)) { /* * In sync context, we're called with either no lock * or with the write lock. If we're not syncing, * we're always called with the read lock held. */ boolean_t need_lock = !RW_WRITE_HELD(&dp->dp_config_rwlock) && dsl_pool_sync_context(dp); if (need_lock) rw_enter(&dp->dp_config_rwlock, RW_READER); err = dsl_prop_get_ds_locked(ds->ds_dir, "refreservation", sizeof (uint64_t), 1, &ds->ds_reserved, NULL); if (err == 0) { err = dsl_prop_get_ds_locked(ds->ds_dir, "refquota", sizeof (uint64_t), 1, &ds->ds_quota, NULL); } if (need_lock) rw_exit(&dp->dp_config_rwlock); } else { ds->ds_reserved = ds->ds_quota = 0; } if (err == 0) { winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, dsl_dataset_evict); } if (err || winner) { bplist_close(&ds->ds_deadlist); if (ds->ds_prev) { dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); } dsl_dir_close(ds->ds_dir, ds); mutex_destroy(&ds->ds_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_deadlist.bpl_lock); kmem_free(ds, sizeof (dsl_dataset_t)); if (err) { dmu_buf_rele(dbuf, tag); return (err); } ds = winner; } else { ds->ds_fsid_guid = unique_insert(ds->ds_phys->ds_fsid_guid); } } ASSERT3P(ds->ds_dbuf, ==, dbuf); ASSERT3P(ds->ds_phys, ==, dbuf->db_data); mutex_enter(&ds->ds_lock); if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && !DS_MODE_IS_INCONSISTENT(mode)) || (ds->ds_open_refcount + weight > DS_REF_MAX)) { mutex_exit(&ds->ds_lock); dsl_dataset_close(ds, DS_MODE_NONE, tag); return (EBUSY); } ds->ds_open_refcount += weight; mutex_exit(&ds->ds_lock); *dsp = ds; return (0); } int dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, void *tag, dsl_dataset_t **dsp) { dsl_dir_t *dd; dsl_pool_t *dp; const char *tail; uint64_t obj; dsl_dataset_t *ds = NULL; int err = 0; err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); if (err) return (err); dp = dd->dd_pool; obj = dd->dd_phys->dd_head_dataset_obj; rw_enter(&dp->dp_config_rwlock, RW_READER); if (obj == 0) { /* A dataset with no associated objset */ err = ENOENT; goto out; } if (tail != NULL) { objset_t *mos = dp->dp_meta_objset; uint64_t flags; err = dsl_dataset_open_obj(dp, obj, NULL, DS_MODE_NONE, tag, &ds); if (err) goto out; flags = ds->ds_phys->ds_flags; obj = ds->ds_phys->ds_snapnames_zapobj; dsl_dataset_close(ds, DS_MODE_NONE, tag); ds = NULL; if (tail[0] != '@') { err = ENOENT; goto out; } tail++; /* Look for a snapshot */ if (!DS_MODE_IS_READONLY(mode)) { err = EROFS; goto out; } dprintf("looking for snapshot '%s'\n", tail); err = dsl_dataset_snap_lookup(mos, flags, obj, tail, &obj); if (err) goto out; } err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); out: rw_exit(&dp->dp_config_rwlock); dsl_dir_close(dd, FTAG); ASSERT3U((err == 0), ==, (ds != NULL)); /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ *dsp = ds; return (err); } int dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) { return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); } void dsl_dataset_name(dsl_dataset_t *ds, char *name) { if (ds == NULL) { (void) strcpy(name, "mos"); } else { dsl_dir_name(ds->ds_dir, name); VERIFY(0 == dsl_dataset_get_snapname(ds)); if (ds->ds_snapname[0]) { (void) strcat(name, "@"); if (!MUTEX_HELD(&ds->ds_lock)) { /* * We use a "recursive" mutex so that we * can call dprintf_ds() with ds_lock held. */ mutex_enter(&ds->ds_lock); (void) strcat(name, ds->ds_snapname); mutex_exit(&ds->ds_lock); } else { (void) strcat(name, ds->ds_snapname); } } } } static int dsl_dataset_namelen(dsl_dataset_t *ds) { int result; if (ds == NULL) { result = 3; /* "mos" */ } else { result = dsl_dir_namelen(ds->ds_dir); VERIFY(0 == dsl_dataset_get_snapname(ds)); if (ds->ds_snapname[0]) { ++result; /* adding one for the @-sign */ if (!MUTEX_HELD(&ds->ds_lock)) { /* see dsl_datset_name */ mutex_enter(&ds->ds_lock); result += strlen(ds->ds_snapname); mutex_exit(&ds->ds_lock); } else { result += strlen(ds->ds_snapname); } } } return (result); } void dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) { uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; mutex_enter(&ds->ds_lock); ASSERT3U(ds->ds_open_refcount, >=, weight); ds->ds_open_refcount -= weight; mutex_exit(&ds->ds_lock); dmu_buf_rele(ds->ds_dbuf, tag); } void dsl_dataset_downgrade(dsl_dataset_t *ds, int oldmode, int newmode) { uint64_t oldweight = ds_refcnt_weight[DS_MODE_LEVEL(oldmode)]; uint64_t newweight = ds_refcnt_weight[DS_MODE_LEVEL(newmode)]; mutex_enter(&ds->ds_lock); ASSERT3U(ds->ds_open_refcount, >=, oldweight); ASSERT3U(oldweight, >=, newweight); ds->ds_open_refcount -= oldweight; ds->ds_open_refcount += newweight; mutex_exit(&ds->ds_lock); } boolean_t dsl_dataset_tryupgrade(dsl_dataset_t *ds, int oldmode, int newmode) { boolean_t rv; uint64_t oldweight = ds_refcnt_weight[DS_MODE_LEVEL(oldmode)]; uint64_t newweight = ds_refcnt_weight[DS_MODE_LEVEL(newmode)]; mutex_enter(&ds->ds_lock); ASSERT3U(ds->ds_open_refcount, >=, oldweight); ASSERT3U(newweight, >=, oldweight); if (ds->ds_open_refcount - oldweight + newweight > DS_REF_MAX) { rv = B_FALSE; } else { ds->ds_open_refcount -= oldweight; ds->ds_open_refcount += newweight; rv = B_TRUE; } mutex_exit(&ds->ds_lock); return (rv); } void dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) { objset_t *mos = dp->dp_meta_objset; dmu_buf_t *dbuf; dsl_dataset_phys_t *dsphys; dsl_dataset_t *ds; uint64_t dsobj; dsl_dir_t *dd; dsl_dir_create_root(mos, ddobjp, tx); VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); dsphys = dbuf->db_data; dsphys->ds_dir_obj = dd->dd_object; dsphys->ds_fsid_guid = unique_create(); (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, sizeof (dsphys->ds_guid)); dsphys->ds_snapnames_zapobj = zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); dsphys->ds_creation_time = gethrestime_sec(); dsphys->ds_creation_txg = tx->tx_txg; dsphys->ds_deadlist_obj = bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; dmu_buf_rele(dbuf, FTAG); dmu_buf_will_dirty(dd->dd_dbuf, tx); dd->dd_phys->dd_head_dataset_obj = dsobj; dsl_dir_close(dd, FTAG); VERIFY(0 == dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); (void) dmu_objset_create_impl(dp->dp_spa, ds, &ds->ds_phys->ds_bp, DMU_OST_ZFS, tx); dsl_dataset_close(ds, DS_MODE_NONE, FTAG); } uint64_t dsl_dataset_create_sync_impl(dsl_dir_t *dd, dsl_dataset_t *origin, uint64_t flags, dmu_tx_t *tx) { dsl_pool_t *dp = dd->dd_pool; dmu_buf_t *dbuf; dsl_dataset_phys_t *dsphys; uint64_t dsobj; objset_t *mos = dp->dp_meta_objset; ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); dsphys = dbuf->db_data; dsphys->ds_dir_obj = dd->dd_object; dsphys->ds_flags = flags; dsphys->ds_fsid_guid = unique_create(); (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, sizeof (dsphys->ds_guid)); dsphys->ds_snapnames_zapobj = zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); dsphys->ds_creation_time = gethrestime_sec(); dsphys->ds_creation_txg = tx->tx_txg; dsphys->ds_deadlist_obj = bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); if (origin) { dsphys->ds_prev_snap_obj = origin->ds_object; dsphys->ds_prev_snap_txg = origin->ds_phys->ds_creation_txg; dsphys->ds_used_bytes = origin->ds_phys->ds_used_bytes; dsphys->ds_compressed_bytes = origin->ds_phys->ds_compressed_bytes; dsphys->ds_uncompressed_bytes = origin->ds_phys->ds_uncompressed_bytes; dsphys->ds_bp = origin->ds_phys->ds_bp; dsphys->ds_flags |= origin->ds_phys->ds_flags; dmu_buf_will_dirty(origin->ds_dbuf, tx); origin->ds_phys->ds_num_children++; dmu_buf_will_dirty(dd->dd_dbuf, tx); dd->dd_phys->dd_origin_obj = origin->ds_object; } if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; dmu_buf_rele(dbuf, FTAG); dmu_buf_will_dirty(dd->dd_dbuf, tx); dd->dd_phys->dd_head_dataset_obj = dsobj; return (dsobj); } uint64_t dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) { dsl_pool_t *dp = pdd->dd_pool; uint64_t dsobj, ddobj; dsl_dir_t *dd; ASSERT(lastname[0] != '@'); ddobj = dsl_dir_create_sync(pdd, lastname, tx); VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); dsobj = dsl_dataset_create_sync_impl(dd, origin, flags, tx); dsl_deleg_set_create_perms(dd, tx, cr); dsl_dir_close(dd, FTAG); return (dsobj); } struct destroyarg { dsl_sync_task_group_t *dstg; char *snapname; char *failed; }; static int dsl_snapshot_destroy_one(char *name, void *arg) { struct destroyarg *da = arg; dsl_dataset_t *ds; char *cp; int err; (void) strcat(name, "@"); (void) strcat(name, da->snapname); err = dsl_dataset_open(name, DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, da->dstg, &ds); cp = strchr(name, '@'); *cp = '\0'; if (err == ENOENT) return (0); if (err) { (void) strcpy(da->failed, name); return (err); } dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, dsl_dataset_destroy_sync, ds, da->dstg, 0); return (0); } /* * Destroy 'snapname' in all descendants of 'fsname'. */ #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy int dsl_snapshots_destroy(char *fsname, char *snapname) { int err; struct destroyarg da; dsl_sync_task_t *dst; spa_t *spa; err = spa_open(fsname, &spa, FTAG); if (err) return (err); da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); da.snapname = snapname; da.failed = fsname; err = dmu_objset_find(fsname, dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); if (err == 0) err = dsl_sync_task_group_wait(da.dstg); for (dst = list_head(&da.dstg->dstg_tasks); dst; dst = list_next(&da.dstg->dstg_tasks, dst)) { dsl_dataset_t *ds = dst->dst_arg1; if (dst->dst_err) { dsl_dataset_name(ds, fsname); *strchr(fsname, '@') = '\0'; } /* * If it was successful, destroy_sync would have * closed the ds */ if (err) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, da.dstg); } dsl_sync_task_group_destroy(da.dstg); spa_close(spa, FTAG); return (err); } /* * ds must be opened EXCLUSIVE or PRIMARY. on return (whether * successful or not), ds will be closed and caller can no longer * dereference it. */ int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) { int err; dsl_sync_task_group_t *dstg; objset_t *os; dsl_dir_t *dd; uint64_t obj; if (ds->ds_open_refcount != DS_REF_MAX) { if (dsl_dataset_tryupgrade(ds, DS_MODE_PRIMARY, DS_MODE_EXCLUSIVE) == 0) { dsl_dataset_close(ds, DS_MODE_PRIMARY, tag); return (EBUSY); } } if (dsl_dataset_is_snapshot(ds)) { /* Destroying a snapshot is simpler */ err = dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_destroy_check, dsl_dataset_destroy_sync, ds, tag, 0); goto out; } dd = ds->ds_dir; /* * Check for errors and mark this ds as inconsistent, in * case we crash while freeing the objects. */ err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, dsl_dataset_destroy_begin_sync, ds, NULL, 0); if (err) goto out; err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); if (err) goto out; /* * remove the objects in open context, so that we won't * have too much to do in syncing context. */ for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, ds->ds_phys->ds_prev_snap_txg)) { dmu_tx_t *tx = dmu_tx_create(os); dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); dmu_tx_hold_bonus(tx, obj); err = dmu_tx_assign(tx, TXG_WAIT); if (err) { /* * Perhaps there is not enough disk * space. Just deal with it from * dsl_dataset_destroy_sync(). */ dmu_tx_abort(tx); continue; } VERIFY(0 == dmu_object_free(os, obj, tx)); dmu_tx_commit(tx); } /* Make sure it's not dirty before we finish destroying it. */ txg_wait_synced(dd->dd_pool, 0); dmu_objset_close(os); if (err != ESRCH) goto out; if (ds->ds_user_ptr) { ds->ds_user_evict_func(ds, ds->ds_user_ptr); ds->ds_user_ptr = NULL; } rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); rw_exit(&dd->dd_pool->dp_config_rwlock); if (err) goto out; /* * Blow away the dsl_dir + head dataset. */ dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); dsl_sync_task_create(dstg, dsl_dataset_destroy_check, dsl_dataset_destroy_sync, ds, tag, 0); dsl_sync_task_create(dstg, dsl_dir_destroy_check, dsl_dir_destroy_sync, dd, FTAG, 0); err = dsl_sync_task_group_wait(dstg); dsl_sync_task_group_destroy(dstg); /* if it is successful, *destroy_sync will close the ds+dd */ if (err) dsl_dir_close(dd, FTAG); out: if (err) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); return (err); } int dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) { ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); return (dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_rollback_check, dsl_dataset_rollback_sync, ds, &ost, 0)); } void * dsl_dataset_set_user_ptr(dsl_dataset_t *ds, void *p, dsl_dataset_evict_func_t func) { void *old; mutex_enter(&ds->ds_lock); old = ds->ds_user_ptr; if (old == NULL) { ds->ds_user_ptr = p; ds->ds_user_evict_func = func; } mutex_exit(&ds->ds_lock); return (old); } void * dsl_dataset_get_user_ptr(dsl_dataset_t *ds) { return (ds->ds_user_ptr); } blkptr_t * dsl_dataset_get_blkptr(dsl_dataset_t *ds) { return (&ds->ds_phys->ds_bp); } void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) { ASSERT(dmu_tx_is_syncing(tx)); /* If it's the meta-objset, set dp_meta_rootbp */ if (ds == NULL) { tx->tx_pool->dp_meta_rootbp = *bp; } else { dmu_buf_will_dirty(ds->ds_dbuf, tx); ds->ds_phys->ds_bp = *bp; } } spa_t * dsl_dataset_get_spa(dsl_dataset_t *ds) { return (ds->ds_dir->dd_pool->dp_spa); } void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) { dsl_pool_t *dp; if (ds == NULL) /* this is the meta-objset */ return; ASSERT(ds->ds_user_ptr != NULL); if (ds->ds_phys->ds_next_snap_obj != 0) panic("dirtying snapshot!"); dp = ds->ds_dir->dd_pool; if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { /* up the hold count until we can be written out */ dmu_buf_add_ref(ds->ds_dbuf, ds); } } /* * The unique space in the head dataset can be calculated by subtracting * the space used in the most recent snapshot, that is still being used * in this file system, from the space currently in use. To figure out * the space in the most recent snapshot still in use, we need to take * the total space used in the snapshot and subtract out the space that * has been freed up since the snapshot was taken. */ static void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) { uint64_t mrs_used; uint64_t dlused, dlcomp, dluncomp; ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); if (ds->ds_phys->ds_prev_snap_obj != 0) mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; else mrs_used = 0; VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp)); ASSERT3U(dlused, <=, mrs_used); ds->ds_phys->ds_unique_bytes = ds->ds_phys->ds_used_bytes - (mrs_used - dlused); if (!DS_UNIQUE_IS_ACCURATE(ds) && spa_version(ds->ds_dir->dd_pool->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; } static uint64_t dsl_dataset_unique(dsl_dataset_t *ds) { if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) dsl_dataset_recalc_head_uniq(ds); return (ds->ds_phys->ds_unique_bytes); } struct killarg { int64_t *usedp; int64_t *compressedp; int64_t *uncompressedp; zio_t *zio; dmu_tx_t *tx; }; static int kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) { struct killarg *ka = arg; blkptr_t *bp = &bc->bc_blkptr; ASSERT3U(bc->bc_errno, ==, 0); /* * Since this callback is not called concurrently, no lock is * needed on the accounting values. */ *ka->usedp += bp_get_dasize(spa, bp); *ka->compressedp += BP_GET_PSIZE(bp); *ka->uncompressedp += BP_GET_UCSIZE(bp); /* XXX check for EIO? */ (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); return (0); } /* ARGSUSED */ static int dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; dmu_objset_type_t *ost = arg2; /* * We can only roll back to emptyness if it is a ZPL objset. */ if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) return (EINVAL); /* * This must not be a snapshot. */ if (ds->ds_phys->ds_next_snap_obj != 0) return (EINVAL); /* * If we made changes this txg, traverse_dsl_dataset won't find * them. Try again. */ if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) return (EAGAIN); return (0); } /* ARGSUSED */ static void dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; dmu_objset_type_t *ost = arg2; objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; dmu_buf_will_dirty(ds->ds_dbuf, tx); /* * Before the roll back destroy the zil. */ if (ds->ds_user_ptr != NULL) { zil_rollback_destroy( ((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); /* * We need to make sure that the objset_impl_t is reopened after * we do the rollback, otherwise it will have the wrong * objset_phys_t. Normally this would happen when this * DS_MODE_EXCLUSIVE dataset-open is closed, thus causing the * dataset to be immediately evicted. But when doing "zfs recv * -F", we reopen the objset before that, so that there is no * window where the dataset is closed and inconsistent. */ ds->ds_user_evict_func(ds, ds->ds_user_ptr); ds->ds_user_ptr = NULL; } /* Zero out the deadlist. */ bplist_close(&ds->ds_deadlist); bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); ds->ds_phys->ds_deadlist_obj = bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj)); { /* Free blkptrs that we gave birth to */ zio_t *zio; int64_t used = 0, compressed = 0, uncompressed = 0; struct killarg ka; int64_t delta; zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); ka.usedp = &used; ka.compressedp = &compressed; ka.uncompressedp = &uncompressed; ka.zio = zio; ka.tx = tx; (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, ADVANCE_POST, kill_blkptr, &ka); (void) zio_wait(zio); /* only deduct space beyond any refreservation */ delta = parent_delta(ds, -used); dsl_dir_diduse_space(ds->ds_dir, delta, -compressed, -uncompressed, tx); } if (ds->ds_prev) { /* Change our contents to that of the prev snapshot */ ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; ds->ds_phys->ds_compressed_bytes = ds->ds_prev->ds_phys->ds_compressed_bytes; ds->ds_phys->ds_uncompressed_bytes = ds->ds_prev->ds_phys->ds_uncompressed_bytes; ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; ds->ds_phys->ds_unique_bytes = 0; if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); ds->ds_prev->ds_phys->ds_unique_bytes = 0; } } else { /* Zero out our contents, recreate objset */ bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); ds->ds_phys->ds_used_bytes = 0; ds->ds_phys->ds_compressed_bytes = 0; ds->ds_phys->ds_uncompressed_bytes = 0; ds->ds_phys->ds_flags = 0; ds->ds_phys->ds_unique_bytes = 0; (void) dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, &ds->ds_phys->ds_bp, *ost, tx); } spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %llu", ds->ds_object); } /* ARGSUSED */ static int dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; uint64_t count; int err; /* * Can't delete a head dataset if there are snapshots of it. * (Except if the only snapshots are from the branch we cloned * from.) */ if (ds->ds_prev != NULL && ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) return (EINVAL); /* * This is really a dsl_dir thing, but check it here so that * we'll be less likely to leave this dataset inconsistent & * nearly destroyed. */ err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); if (err) return (err); if (count != 0) return (EEXIST); return (0); } /* ARGSUSED */ static void dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; dsl_pool_t *dp = ds->ds_dir->dd_pool; /* Mark it as inconsistent on-disk, in case we crash */ dmu_buf_will_dirty(ds->ds_dbuf, tx); ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, cr, "dataset = %llu", ds->ds_object); } /* ARGSUSED */ int dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; /* Can't delete a branch point. */ if (ds->ds_phys->ds_num_children > 1) return (EEXIST); /* * Can't delete a head dataset if there are snapshots of it. * (Except if the only snapshots are from the branch we cloned * from.) */ if (ds->ds_prev != NULL && ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) return (EINVAL); /* * If we made changes this txg, traverse_dsl_dataset won't find * them. Try again. */ if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) return (EAGAIN); /* XXX we should do some i/o error checking... */ return (0); } void dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; int64_t used = 0, compressed = 0, uncompressed = 0; zio_t *zio; int err; int after_branch_point = FALSE; dsl_pool_t *dp = ds->ds_dir->dd_pool; objset_t *mos = dp->dp_meta_objset; dsl_dataset_t *ds_prev = NULL; uint64_t obj; ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); ASSERT(ds->ds_prev == NULL || ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); /* Remove our reservation */ if (ds->ds_reserved != 0) { uint64_t val = 0; dsl_dataset_set_reservation_sync(ds, &val, cr, tx); ASSERT3U(ds->ds_reserved, ==, 0); } ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); obj = ds->ds_object; if (ds->ds_phys->ds_prev_snap_obj != 0) { if (ds->ds_prev) { ds_prev = ds->ds_prev; } else { VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_NONE, FTAG, &ds_prev)); } after_branch_point = (ds_prev->ds_phys->ds_next_snap_obj != obj); dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); if (after_branch_point && ds->ds_phys->ds_next_snap_obj == 0) { /* This clone is toast. */ ASSERT(ds_prev->ds_phys->ds_num_children > 1); ds_prev->ds_phys->ds_num_children--; } else if (!after_branch_point) { ds_prev->ds_phys->ds_next_snap_obj = ds->ds_phys->ds_next_snap_obj; } } zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); if (ds->ds_phys->ds_next_snap_obj != 0) { blkptr_t bp; dsl_dataset_t *ds_next; uint64_t itor = 0; uint64_t old_unique; spa_scrub_restart(dp->dp_spa, tx->tx_txg); VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_phys->ds_next_snap_obj, NULL, DS_MODE_NONE, FTAG, &ds_next)); ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); old_unique = dsl_dataset_unique(ds_next); dmu_buf_will_dirty(ds_next->ds_dbuf, tx); ds_next->ds_phys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; ds_next->ds_phys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); /* * Transfer to our deadlist (which will become next's * new deadlist) any entries from next's current * deadlist which were born before prev, and free the * other entries. * * XXX we're doing this long task with the config lock held */ while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, &bp, tx)); if (ds_prev && !after_branch_point && bp.blk_birth > ds_prev->ds_phys->ds_prev_snap_txg) { ds_prev->ds_phys->ds_unique_bytes += bp_get_dasize(dp->dp_spa, &bp); } } else { used += bp_get_dasize(dp->dp_spa, &bp); compressed += BP_GET_PSIZE(&bp); uncompressed += BP_GET_UCSIZE(&bp); /* XXX check return value? */ (void) arc_free(zio, dp->dp_spa, tx->tx_txg, &bp, NULL, NULL, ARC_NOWAIT); } } /* free next's deadlist */ bplist_close(&ds_next->ds_deadlist); bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); /* set next's deadlist to our deadlist */ ds_next->ds_phys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, ds_next->ds_phys->ds_deadlist_obj)); ds->ds_phys->ds_deadlist_obj = 0; if (ds_next->ds_phys->ds_next_snap_obj != 0) { /* * Update next's unique to include blocks which * were previously shared by only this snapshot * and it. Those blocks will be born after the * prev snap and before this snap, and will have * died after the next snap and before the one * after that (ie. be on the snap after next's * deadlist). * * XXX we're doing this long task with the * config lock held */ dsl_dataset_t *ds_after_next; VERIFY(0 == dsl_dataset_open_obj(dp, ds_next->ds_phys->ds_next_snap_obj, NULL, DS_MODE_NONE, FTAG, &ds_after_next)); itor = 0; while (bplist_iterate(&ds_after_next->ds_deadlist, &itor, &bp) == 0) { if (bp.blk_birth > ds->ds_phys->ds_prev_snap_txg && bp.blk_birth <= ds->ds_phys->ds_creation_txg) { ds_next->ds_phys->ds_unique_bytes += bp_get_dasize(dp->dp_spa, &bp); } } dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); ASSERT3P(ds_next->ds_prev, ==, NULL); } else { ASSERT3P(ds_next->ds_prev, ==, ds); dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, ds_next); if (ds_prev) { VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_NONE, ds_next, &ds_next->ds_prev)); } else { ds_next->ds_prev = NULL; } dsl_dataset_recalc_head_uniq(ds_next); /* * Reduce the amount of our unconsmed refreservation * being charged to our parent by the amount of * new unique data we have gained. */ if (old_unique < ds_next->ds_reserved) { int64_t mrsdelta; uint64_t new_unique = ds_next->ds_phys->ds_unique_bytes; ASSERT(old_unique <= new_unique); mrsdelta = MIN(new_unique - old_unique, ds_next->ds_reserved - old_unique); dsl_dir_diduse_space(ds->ds_dir, -mrsdelta, 0, 0, tx); } } dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); /* * NB: unique_bytes might not be accurate for the head objset. * Before SPA_VERSION 9, we didn't update its value when we * deleted the most recent snapshot. */ ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); } else { /* * There's no next snapshot, so this is a head dataset. * Destroy the deadlist. Unless it's a clone, the * deadlist should be empty. (If it's a clone, it's * safe to ignore the deadlist contents.) */ struct killarg ka; ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); bplist_close(&ds->ds_deadlist); bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); ds->ds_phys->ds_deadlist_obj = 0; /* * Free everything that we point to (that's born after * the previous snapshot, if we are a clone) * * XXX we're doing this long task with the config lock held */ ka.usedp = &used; ka.compressedp = &compressed; ka.uncompressedp = &uncompressed; ka.zio = zio; ka.tx = tx; err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, ADVANCE_POST, kill_blkptr, &ka); ASSERT3U(err, ==, 0); ASSERT(spa_version(dp->dp_spa) < SPA_VERSION_UNIQUE_ACCURATE || used == ds->ds_phys->ds_unique_bytes); } err = zio_wait(zio); ASSERT3U(err, ==, 0); dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); if (ds->ds_phys->ds_snapnames_zapobj) { err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); ASSERT(err == 0); } if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { /* Erase the link in the dataset */ dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; /* * dsl_dir_sync_destroy() called us, they'll destroy * the dataset. */ } else { /* remove from snapshot namespace */ dsl_dataset_t *ds_head; VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &ds_head)); VERIFY(0 == dsl_dataset_get_snapname(ds)); #ifdef ZFS_DEBUG { uint64_t val; err = dsl_dataset_snap_lookup(mos, ds_head->ds_phys->ds_flags, ds_head->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, &val); ASSERT3U(err, ==, 0); ASSERT3U(val, ==, obj); } #endif err = dsl_dataset_snap_remove(mos, ds_head->ds_phys->ds_flags, ds_head->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, tx); ASSERT(err == 0); dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); } if (ds_prev && ds->ds_prev != ds_prev) dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, cr, "dataset = %llu", ds->ds_object); dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); VERIFY(0 == dmu_object_free(mos, obj, tx)); } static int dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) { uint64_t asize; if (!dmu_tx_is_syncing(tx)) return (0); /* * If there's an fs-only reservation, any blocks that might become * owned by the snapshot dataset must be accommodated by space * outside of the reservation. */ asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) return (ENOSPC); /* * Propogate any reserved space for this snapshot to other * snapshot checks in this sync group. */ if (asize > 0) dsl_dir_willuse_space(ds->ds_dir, asize, tx); return (0); } /* ARGSUSED */ int dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; const char *snapname = arg2; objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; int err; uint64_t value; /* * We don't allow multiple snapshots of the same txg. If there * is already one, try again. */ if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) return (EAGAIN); /* * Check for conflicting name snapshot name. */ err = dsl_dataset_snap_lookup(mos, ds->ds_phys->ds_flags, ds->ds_phys->ds_snapnames_zapobj, snapname, &value); if (err == 0) return (EEXIST); if (err != ENOENT) return (err); /* * Check that the dataset's name is not too long. Name consists * of the dataset's length + 1 for the @-sign + snapshot name's length */ if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) return (ENAMETOOLONG); err = dsl_dataset_snapshot_reserve_space(ds, tx); if (err) return (err); ds->ds_trysnap_txg = tx->tx_txg; return (0); } void dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; const char *snapname = arg2; dsl_pool_t *dp = ds->ds_dir->dd_pool; dmu_buf_t *dbuf; dsl_dataset_phys_t *dsphys; uint64_t dsobj; objset_t *mos = dp->dp_meta_objset; int err; spa_scrub_restart(dp->dp_spa, tx->tx_txg); ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); dsphys = dbuf->db_data; dsphys->ds_dir_obj = ds->ds_dir->dd_object; dsphys->ds_fsid_guid = unique_create(); (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, sizeof (dsphys->ds_guid)); dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; dsphys->ds_next_snap_obj = ds->ds_object; dsphys->ds_num_children = 1; dsphys->ds_creation_time = gethrestime_sec(); dsphys->ds_creation_txg = tx->tx_txg; dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; dsphys->ds_flags = ds->ds_phys->ds_flags; dsphys->ds_bp = ds->ds_phys->ds_bp; dmu_buf_rele(dbuf, FTAG); ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); if (ds->ds_prev) { ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object || ds->ds_prev->ds_phys->ds_num_children > 1); if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, ds->ds_prev->ds_phys->ds_creation_txg); ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; } } /* * If we have a reference-reservation on this dataset, we will * need to increase the amount of refreservation being charged * since our unique space is going to zero. */ if (ds->ds_reserved) { int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); dsl_dir_diduse_space(ds->ds_dir, add, 0, 0, tx); } bplist_close(&ds->ds_deadlist); dmu_buf_will_dirty(ds->ds_dbuf, tx); ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); ds->ds_phys->ds_prev_snap_obj = dsobj; ds->ds_phys->ds_prev_snap_txg = tx->tx_txg; ds->ds_phys->ds_unique_bytes = 0; if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; ds->ds_phys->ds_deadlist_obj = bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj)); dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, snapname, 8, 1, &dsobj, tx); ASSERT(err == 0); if (ds->ds_prev) dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_phys->ds_prev_snap_obj, snapname, DS_MODE_NONE, ds, &ds->ds_prev)); spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, "dataset = %llu", dsobj); } void dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) { ASSERT(dmu_tx_is_syncing(tx)); ASSERT(ds->ds_user_ptr != NULL); ASSERT(ds->ds_phys->ds_next_snap_obj == 0); /* * in case we had to change ds_fsid_guid when we opened it, * sync it out now. */ dmu_buf_will_dirty(ds->ds_dbuf, tx); ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; dsl_dir_dirty(ds->ds_dir, tx); dmu_objset_sync(ds->ds_user_ptr, zio, tx); } void dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) { uint64_t refd, avail, uobjs, aobjs; dsl_dir_stats(ds->ds_dir, nv); dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, ds->ds_phys->ds_creation_time); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, ds->ds_phys->ds_creation_txg); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, ds->ds_quota); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, ds->ds_reserved); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, ds->ds_phys->ds_guid); if (ds->ds_phys->ds_next_snap_obj) { /* * This is a snapshot; override the dd's space used with * our unique space and compression ratio. */ dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, ds->ds_phys->ds_unique_bytes); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ds->ds_phys->ds_compressed_bytes == 0 ? 100 : (ds->ds_phys->ds_uncompressed_bytes * 100 / ds->ds_phys->ds_compressed_bytes)); } } void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) { stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; stat->dds_guid = ds->ds_phys->ds_guid; if (ds->ds_phys->ds_next_snap_obj) { stat->dds_is_snapshot = B_TRUE; stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; } /* clone origin is really a dsl_dir thing... */ rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); if (ds->ds_dir->dd_phys->dd_origin_obj) { dsl_dataset_t *ods; VERIFY(0 == dsl_dataset_open_obj(ds->ds_dir->dd_pool, ds->ds_dir->dd_phys->dd_origin_obj, NULL, DS_MODE_NONE, FTAG, &ods)); dsl_dataset_name(ods, stat->dds_origin); dsl_dataset_close(ods, DS_MODE_NONE, FTAG); } rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); } uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds) { return (ds->ds_fsid_guid); } void dsl_dataset_space(dsl_dataset_t *ds, uint64_t *refdbytesp, uint64_t *availbytesp, uint64_t *usedobjsp, uint64_t *availobjsp) { *refdbytesp = ds->ds_phys->ds_used_bytes; *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; if (ds->ds_quota != 0) { /* * Adjust available bytes according to refquota */ if (*refdbytesp < ds->ds_quota) *availbytesp = MIN(*availbytesp, ds->ds_quota - *refdbytesp); else *availbytesp = 0; } *usedobjsp = ds->ds_phys->ds_bp.blk_fill; *availobjsp = DN_MAX_OBJECT - *usedobjsp; } boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) { dsl_pool_t *dp = ds->ds_dir->dd_pool; ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || dsl_pool_sync_context(dp)); if (ds->ds_prev == NULL) return (B_FALSE); if (ds->ds_phys->ds_bp.blk_birth > ds->ds_prev->ds_phys->ds_creation_txg) return (B_TRUE); return (B_FALSE); } /* ARGSUSED */ static int dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; char *newsnapname = arg2; dsl_dir_t *dd = ds->ds_dir; objset_t *mos = dd->dd_pool->dp_meta_objset; dsl_dataset_t *hds; uint64_t val; int err; err = dsl_dataset_open_obj(dd->dd_pool, dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); if (err) return (err); /* new name better not be in use */ err = dsl_dataset_snap_lookup(mos, hds->ds_phys->ds_flags, hds->ds_phys->ds_snapnames_zapobj, newsnapname, &val); dsl_dataset_close(hds, DS_MODE_NONE, FTAG); if (err == 0) err = EEXIST; else if (err == ENOENT) err = 0; /* dataset name + 1 for the "@" + the new snapshot name must fit */ if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) err = ENAMETOOLONG; return (err); } static void dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; const char *newsnapname = arg2; dsl_dir_t *dd = ds->ds_dir; objset_t *mos = dd->dd_pool->dp_meta_objset; dsl_dataset_t *hds; int err; ASSERT(ds->ds_phys->ds_next_snap_obj != 0); VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); VERIFY(0 == dsl_dataset_get_snapname(ds)); err = dsl_dataset_snap_remove(mos, hds->ds_phys->ds_flags, hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, tx); ASSERT3U(err, ==, 0); mutex_enter(&ds->ds_lock); (void) strcpy(ds->ds_snapname, newsnapname); mutex_exit(&ds->ds_lock); err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 8, 1, &ds->ds_object, tx); ASSERT3U(err, ==, 0); spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, cr, "dataset = %llu", ds->ds_object); dsl_dataset_close(hds, DS_MODE_NONE, FTAG); } struct renamesnaparg { dsl_sync_task_group_t *dstg; char failed[MAXPATHLEN]; char *oldsnap; char *newsnap; }; static int dsl_snapshot_rename_one(char *name, void *arg) { struct renamesnaparg *ra = arg; dsl_dataset_t *ds = NULL; char *cp; int err; cp = name + strlen(name); *cp = '@'; (void) strcpy(cp + 1, ra->oldsnap); /* * For recursive snapshot renames the parent won't be changing * so we just pass name for both the to/from argument. */ if (err = zfs_secpolicy_rename_perms(name, name, CRED())) { (void) strcpy(ra->failed, name); return (err); } err = dsl_dataset_open(name, DS_MODE_READONLY | DS_MODE_STANDARD, ra->dstg, &ds); if (err == ENOENT) { *cp = '\0'; return (0); } if (err) { (void) strcpy(ra->failed, name); *cp = '\0'; dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); return (err); } #ifdef _KERNEL /* for all filesystems undergoing rename, we'll need to unmount it */ (void) zfs_unmount_snap(name, NULL); #endif *cp = '\0'; dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); return (0); } static int dsl_recursive_rename(char *oldname, const char *newname) { int err; struct renamesnaparg *ra; dsl_sync_task_t *dst; spa_t *spa; char *cp, *fsname = spa_strdup(oldname); int len = strlen(oldname); /* truncate the snapshot name to get the fsname */ cp = strchr(fsname, '@'); *cp = '\0'; err = spa_open(fsname, &spa, FTAG); if (err) { kmem_free(fsname, len + 1); return (err); } ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); ra->oldsnap = strchr(oldname, '@') + 1; ra->newsnap = strchr(newname, '@') + 1; *ra->failed = '\0'; err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, DS_FIND_CHILDREN); kmem_free(fsname, len + 1); if (err == 0) { err = dsl_sync_task_group_wait(ra->dstg); } for (dst = list_head(&ra->dstg->dstg_tasks); dst; dst = list_next(&ra->dstg->dstg_tasks, dst)) { dsl_dataset_t *ds = dst->dst_arg1; if (dst->dst_err) { dsl_dir_name(ds->ds_dir, ra->failed); (void) strcat(ra->failed, "@"); (void) strcat(ra->failed, ra->newsnap); } dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); } if (err) (void) strcpy(oldname, ra->failed); dsl_sync_task_group_destroy(ra->dstg); kmem_free(ra, sizeof (struct renamesnaparg)); spa_close(spa, FTAG); return (err); } static int dsl_valid_rename(char *oldname, void *arg) { int delta = *(int *)arg; if (strlen(oldname) + delta >= MAXNAMELEN) return (ENAMETOOLONG); return (0); } #pragma weak dmu_objset_rename = dsl_dataset_rename int dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) { dsl_dir_t *dd; dsl_dataset_t *ds; const char *tail; int err; err = dsl_dir_open(oldname, FTAG, &dd, &tail); if (err) return (err); if (tail == NULL) { int delta = strlen(newname) - strlen(oldname); /* if we're growing, validate child size lengths */ if (delta > 0) err = dmu_objset_find(oldname, dsl_valid_rename, &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); if (!err) err = dsl_dir_rename(dd, newname); dsl_dir_close(dd, FTAG); return (err); } if (tail[0] != '@') { /* the name ended in a nonexistant component */ dsl_dir_close(dd, FTAG); return (ENOENT); } dsl_dir_close(dd, FTAG); /* new name must be snapshot in same filesystem */ tail = strchr(newname, '@'); if (tail == NULL) return (EINVAL); tail++; if (strncmp(oldname, newname, tail - newname) != 0) return (EXDEV); if (recursive) { err = dsl_recursive_rename(oldname, newname); } else { err = dsl_dataset_open(oldname, DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); if (err) return (err); err = dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_snapshot_rename_check, dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); } return (err); } struct promotearg { uint64_t used, comp, uncomp, unique; uint64_t ds_flags, newnext_obj, snapnames_obj; }; /* ARGSUSED */ static int dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *hds = arg1; struct promotearg *pa = arg2; dsl_dir_t *dd = hds->ds_dir; dsl_pool_t *dp = hds->ds_dir->dd_pool; dsl_dir_t *odd = NULL; dsl_dataset_t *ds = NULL; dsl_dataset_t *origin_ds = NULL; dsl_dataset_t *newnext_ds = NULL; int err; char *name = NULL; uint64_t itor = 0; blkptr_t bp; bzero(pa, sizeof (*pa)); /* Check that it is a clone */ if (dd->dd_phys->dd_origin_obj == 0) return (EINVAL); /* Since this is so expensive, don't do the preliminary check */ if (!dmu_tx_is_syncing(tx)) return (0); if (err = dsl_dataset_open_obj(dp, dd->dd_phys->dd_origin_obj, NULL, DS_MODE_EXCLUSIVE, FTAG, &origin_ds)) goto out; odd = origin_ds->ds_dir; { dsl_dataset_t *phds; if (err = dsl_dataset_open_obj(dd->dd_pool, odd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &phds)) goto out; pa->ds_flags = phds->ds_phys->ds_flags; pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; dsl_dataset_close(phds, DS_MODE_NONE, FTAG); } if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { err = EXDEV; goto out; } /* find origin's new next ds */ VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, NULL, DS_MODE_NONE, FTAG, &newnext_ds)); while (newnext_ds->ds_phys->ds_prev_snap_obj != origin_ds->ds_object) { dsl_dataset_t *prev; if (err = dsl_dataset_open_obj(dd->dd_pool, newnext_ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_NONE, FTAG, &prev)) goto out; dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); newnext_ds = prev; } pa->newnext_obj = newnext_ds->ds_object; /* compute origin's new unique space */ while ((err = bplist_iterate(&newnext_ds->ds_deadlist, &itor, &bp)) == 0) { if (bp.blk_birth > origin_ds->ds_phys->ds_prev_snap_txg) pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); } if (err != ENOENT) goto out; /* Walk the snapshots that we are moving */ name = kmem_alloc(MAXPATHLEN, KM_SLEEP); ds = origin_ds; /* CONSTCOND */ while (TRUE) { uint64_t val, dlused, dlcomp, dluncomp; dsl_dataset_t *prev; /* Check that the snapshot name does not conflict */ dsl_dataset_name(ds, name); err = dsl_dataset_snap_lookup(dd->dd_pool->dp_meta_objset, hds->ds_phys->ds_flags, hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, &val); if (err != ENOENT) { if (err == 0) err = EEXIST; goto out; } /* * compute space to transfer. Each snapshot gave birth to: * (my used) - (prev's used) + (deadlist's used) */ pa->used += ds->ds_phys->ds_used_bytes; pa->comp += ds->ds_phys->ds_compressed_bytes; pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; /* If we reach the first snapshot, we're done. */ if (ds->ds_phys->ds_prev_snap_obj == 0) break; if (err = bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp)) goto out; if (err = dsl_dataset_open_obj(dd->dd_pool, ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, FTAG, &prev)) goto out; pa->used += dlused - prev->ds_phys->ds_used_bytes; pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; /* * We could be a clone of a clone. If we reach our * parent's branch point, we're done. */ if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); break; } if (ds != origin_ds) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); ds = prev; } /* Check that there is enough space here */ err = dsl_dir_transfer_possible(odd, dd, pa->used); out: if (ds && ds != origin_ds) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); if (origin_ds) dsl_dataset_close(origin_ds, DS_MODE_EXCLUSIVE, FTAG); if (newnext_ds) dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); if (name) kmem_free(name, MAXPATHLEN); return (err); } static void dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *hds = arg1; struct promotearg *pa = arg2; dsl_dir_t *dd = hds->ds_dir; dsl_pool_t *dp = hds->ds_dir->dd_pool; dsl_dir_t *odd = NULL; dsl_dataset_t *ds, *origin_ds; char *name; ASSERT(dd->dd_phys->dd_origin_obj != 0); ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); VERIFY(0 == dsl_dataset_open_obj(dp, dd->dd_phys->dd_origin_obj, NULL, DS_MODE_EXCLUSIVE, FTAG, &origin_ds)); /* * We need to explicitly open odd, since origin_ds's dd will be * changing. */ VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, NULL, FTAG, &odd)); /* move snapshots to this dir */ name = kmem_alloc(MAXPATHLEN, KM_SLEEP); ds = origin_ds; /* CONSTCOND */ while (TRUE) { dsl_dataset_t *prev; /* move snap name entry */ dsl_dataset_name(ds, name); VERIFY(0 == dsl_dataset_snap_remove(dp->dp_meta_objset, pa->ds_flags, pa->snapnames_obj, ds->ds_snapname, tx)); VERIFY(0 == zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 8, 1, &ds->ds_object, tx)); /* change containing dsl_dir */ dmu_buf_will_dirty(ds->ds_dbuf, tx); ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); ds->ds_phys->ds_dir_obj = dd->dd_object; ASSERT3P(ds->ds_dir, ==, odd); dsl_dir_close(ds->ds_dir, ds); VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, NULL, ds, &ds->ds_dir)); ASSERT3U(dsl_prop_numcb(ds), ==, 0); if (ds->ds_phys->ds_prev_snap_obj == 0) break; VERIFY(0 == dsl_dataset_open_obj(dp, ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, FTAG, &prev)); if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); break; } if (ds != origin_ds) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); ds = prev; } if (ds != origin_ds) dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); /* change origin's next snap */ dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); origin_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; /* change origin */ dmu_buf_will_dirty(dd->dd_dbuf, tx); ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; dmu_buf_will_dirty(odd->dd_dbuf, tx); odd->dd_phys->dd_origin_obj = origin_ds->ds_object; /* change space accounting */ dsl_dir_diduse_space(odd, -pa->used, -pa->comp, -pa->uncomp, tx); dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); origin_ds->ds_phys->ds_unique_bytes = pa->unique; /* log history record */ spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, cr, "dataset = %llu", ds->ds_object); dsl_dir_close(odd, FTAG); dsl_dataset_close(origin_ds, DS_MODE_EXCLUSIVE, FTAG); kmem_free(name, MAXPATHLEN); } int dsl_dataset_promote(const char *name) { dsl_dataset_t *ds; int err; dmu_object_info_t doi; struct promotearg pa; err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); if (err) return (err); err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_phys->ds_snapnames_zapobj, &doi); if (err) { dsl_dataset_close(ds, DS_MODE_NONE, FTAG); return (err); } /* * Add in 128x the snapnames zapobj size, since we will be moving * a bunch of snapnames to the promoted ds, and dirtying their * bonus buffers. */ err = dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_promote_check, dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); dsl_dataset_close(ds, DS_MODE_NONE, FTAG); return (err); } struct cloneswaparg { dsl_dataset_t *cds; /* clone dataset */ dsl_dataset_t *ohds; /* origin's head dataset */ boolean_t force; int64_t unused_refres_delta; /* change in unconsumed refreservation */ }; /* ARGSUSED */ static int dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) { struct cloneswaparg *csa = arg1; /* they should both be heads */ if (dsl_dataset_is_snapshot(csa->cds) || dsl_dataset_is_snapshot(csa->ohds)) return (EINVAL); /* the branch point should be just before them */ if (csa->cds->ds_prev != csa->ohds->ds_prev) return (EINVAL); /* cds should be the clone */ if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != csa->ohds->ds_object) return (EINVAL); /* the clone should be a child of the origin */ if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) return (EINVAL); /* ohds shouldn't be modified unless 'force' */ if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) return (ETXTBSY); /* adjust amount of any unconsumed refreservation */ csa->unused_refres_delta = (int64_t)MIN(csa->ohds->ds_reserved, csa->ohds->ds_phys->ds_unique_bytes) - (int64_t)MIN(csa->ohds->ds_reserved, csa->cds->ds_phys->ds_unique_bytes); if (csa->unused_refres_delta > 0 && csa->unused_refres_delta > dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) return (ENOSPC); return (0); } /* ARGSUSED */ static void dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { struct cloneswaparg *csa = arg1; dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; uint64_t itor = 0; blkptr_t bp; uint64_t unique = 0; int err; ASSERT(csa->cds->ds_reserved == 0); ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); if (csa->cds->ds_user_ptr != NULL) { csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); csa->cds->ds_user_ptr = NULL; } if (csa->ohds->ds_user_ptr != NULL) { csa->ohds->ds_user_evict_func(csa->ohds, csa->ohds->ds_user_ptr); csa->ohds->ds_user_ptr = NULL; } /* compute unique space */ while ((err = bplist_iterate(&csa->cds->ds_deadlist, &itor, &bp)) == 0) { if (bp.blk_birth > csa->cds->ds_prev->ds_phys->ds_prev_snap_txg) unique += bp_get_dasize(dp->dp_spa, &bp); } VERIFY(err == ENOENT); /* reset origin's unique bytes */ csa->cds->ds_prev->ds_phys->ds_unique_bytes = unique; /* swap blkptrs */ { blkptr_t tmp; tmp = csa->ohds->ds_phys->ds_bp; csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; csa->cds->ds_phys->ds_bp = tmp; } /* set dd_*_bytes */ { int64_t dused, dcomp, duncomp; uint64_t cdl_used, cdl_comp, cdl_uncomp; uint64_t odl_used, odl_comp, odl_uncomp; VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, &cdl_comp, &cdl_uncomp)); VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, &odl_comp, &odl_uncomp)); dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - (csa->ohds->ds_phys->ds_used_bytes + odl_used); dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + cdl_uncomp - (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); dsl_dir_diduse_space(csa->ohds->ds_dir, dused, dcomp, duncomp, tx); dsl_dir_diduse_space(csa->cds->ds_dir, -dused, -dcomp, -duncomp, tx); } #define SWITCH64(x, y) \ { \ uint64_t __tmp = (x); \ (x) = (y); \ (y) = __tmp; \ } /* swap ds_*_bytes */ SWITCH64(csa->ohds->ds_phys->ds_used_bytes, csa->cds->ds_phys->ds_used_bytes); SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, csa->cds->ds_phys->ds_compressed_bytes); SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, csa->cds->ds_phys->ds_uncompressed_bytes); SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, csa->cds->ds_phys->ds_unique_bytes); /* apply any parent delta for change in unconsumed refreservation */ dsl_dir_diduse_space(csa->ohds->ds_dir, csa->unused_refres_delta, 0, 0, tx); /* swap deadlists */ bplist_close(&csa->cds->ds_deadlist); bplist_close(&csa->ohds->ds_deadlist); SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, csa->cds->ds_phys->ds_deadlist_obj); VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, csa->cds->ds_phys->ds_deadlist_obj)); VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, csa->ohds->ds_phys->ds_deadlist_obj)); } /* * Swap 'clone' with its origin head file system. */ int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, boolean_t force) { struct cloneswaparg csa; ASSERT(clone->ds_open_refcount == DS_REF_MAX); ASSERT(origin_head->ds_open_refcount == DS_REF_MAX); csa.cds = clone; csa.ohds = origin_head; csa.force = force; return (dsl_sync_task_do(clone->ds_dir->dd_pool, dsl_dataset_clone_swap_check, dsl_dataset_clone_swap_sync, &csa, NULL, 9)); } /* * Given a pool name and a dataset object number in that pool, * return the name of that dataset. */ int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) { spa_t *spa; dsl_pool_t *dp; dsl_dataset_t *ds = NULL; int error; if ((error = spa_open(pname, &spa, FTAG)) != 0) return (error); dp = spa_get_dsl(spa); rw_enter(&dp->dp_config_rwlock, RW_READER); if ((error = dsl_dataset_open_obj(dp, obj, NULL, DS_MODE_NONE, FTAG, &ds)) != 0) { rw_exit(&dp->dp_config_rwlock); spa_close(spa, FTAG); return (error); } dsl_dataset_name(ds, buf); dsl_dataset_close(ds, DS_MODE_NONE, FTAG); rw_exit(&dp->dp_config_rwlock); spa_close(spa, FTAG); return (0); } int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) { int error = 0; ASSERT3S(asize, >, 0); /* * *ref_rsrv is the portion of asize that will come from any * unconsumed refreservation space. */ *ref_rsrv = 0; mutex_enter(&ds->ds_lock); /* * Make a space adjustment for reserved bytes. */ if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { ASSERT3U(*used, >=, ds->ds_reserved - ds->ds_phys->ds_unique_bytes); *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); *ref_rsrv = asize - MIN(asize, parent_delta(ds, asize + inflight)); } if (!check_quota || ds->ds_quota == 0) { mutex_exit(&ds->ds_lock); return (0); } /* * If they are requesting more space, and our current estimate * is over quota, they get to try again unless the actual * on-disk is over quota and there are no pending changes (which * may free up space for us). */ if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) error = ERESTART; else error = EDQUOT; } mutex_exit(&ds->ds_lock); return (error); } /* ARGSUSED */ static int dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; uint64_t *quotap = arg2; uint64_t new_quota = *quotap; if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) return (ENOTSUP); if (new_quota == 0) return (0); if (new_quota < ds->ds_phys->ds_used_bytes || new_quota < ds->ds_reserved) return (ENOSPC); return (0); } /* ARGSUSED */ void dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; uint64_t *quotap = arg2; uint64_t new_quota = *quotap; dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); ds->ds_quota = new_quota; mutex_exit(&ds->ds_lock); dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu ", (longlong_t)new_quota, ds->ds_dir->dd_phys->dd_head_dataset_obj); } int dsl_dataset_set_quota(const char *dsname, uint64_t quota) { dsl_dataset_t *ds; int err; err = dsl_dataset_open(dsname, DS_MODE_STANDARD, FTAG, &ds); if (err) return (err); if (quota != ds->ds_quota) { /* * If someone removes a file, then tries to set the quota, we * want to make sure the file freeing takes effect. */ txg_wait_open(ds->ds_dir->dd_pool, 0); err = dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, ds, "a, 0); } dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); return (err); } static int dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; uint64_t *reservationp = arg2; uint64_t new_reservation = *reservationp; int64_t delta; uint64_t unique; if (new_reservation > INT64_MAX) return (EOVERFLOW); if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFRESERVATION) return (ENOTSUP); if (dsl_dataset_is_snapshot(ds)) return (EINVAL); /* * If we are doing the preliminary check in open context, the * space estimates may be inaccurate. */ if (!dmu_tx_is_syncing(tx)) return (0); mutex_enter(&ds->ds_lock); unique = dsl_dataset_unique(ds); delta = MAX(unique, new_reservation) - MAX(unique, ds->ds_reserved); mutex_exit(&ds->ds_lock); if (delta > 0 && delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) return (ENOSPC); if (delta > 0 && ds->ds_quota > 0 && new_reservation > ds->ds_quota) return (ENOSPC); return (0); } /* ARGSUSED */ static void dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) { dsl_dataset_t *ds = arg1; uint64_t *reservationp = arg2; uint64_t new_reservation = *reservationp; uint64_t unique; int64_t delta; dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); unique = dsl_dataset_unique(ds); delta = MAX(0, (int64_t)(new_reservation - unique)) - MAX(0, (int64_t)(ds->ds_reserved - unique)); ds->ds_reserved = new_reservation; mutex_exit(&ds->ds_lock); dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", new_reservation, cr, tx); dsl_dir_diduse_space(ds->ds_dir, delta, 0, 0, tx); spa_history_internal_log(LOG_DS_REFRESERV, ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", (longlong_t)new_reservation, ds->ds_dir->dd_phys->dd_head_dataset_obj); } int dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) { dsl_dataset_t *ds; int err; err = dsl_dataset_open(dsname, DS_MODE_STANDARD, FTAG, &ds); if (err) return (err); err = dsl_sync_task_do(ds->ds_dir->dd_pool, dsl_dataset_set_reservation_check, dsl_dataset_set_reservation_sync, ds, &reservation, 0); dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); return (err); }