Index: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c =================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c (revision 278141) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c (revision 278142) @@ -1,3429 +1,3429 @@ /* * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Portions Copyright (c) 2011 Martin Matuska * Copyright (c) 2011, 2014 by Delphix. All rights reserved. * Copyright (c) 2014, Joyent, Inc. All rights reserved. * Copyright (c) 2014 RackTop Systems. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include SYSCTL_DECL(_vfs_zfs); /* * The SPA supports block sizes up to 16MB. However, very large blocks * can have an impact on i/o latency (e.g. tying up a spinning disk for * ~300ms), and also potentially on the memory allocator. Therefore, * we do not allow the recordsize to be set larger than zfs_max_recordsize * (default 1MB). Larger blocks can be created by changing this tunable, * and pools with larger blocks can always be imported and used, regardless * of this setting. */ int zfs_max_recordsize = 1 * 1024 * 1024; SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, &zfs_max_recordsize, 0, "Maximum block size. Expect dragons when tuning this."); #define SWITCH64(x, y) \ { \ uint64_t __tmp = (x); \ (x) = (y); \ (y) = __tmp; \ } #define DS_REF_MAX (1ULL << 62) extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); extern inline boolean_t dsl_dataset_is_snapshot(dsl_dataset_t *ds); /* * 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) { dsl_dataset_phys_t *ds_phys; uint64_t old_bytes, new_bytes; if (ds->ds_reserved == 0) return (delta); ds_phys = dsl_dataset_phys(ds); old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); new_bytes = MAX(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, const blkptr_t *bp, dmu_tx_t *tx) { int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); int compressed = BP_GET_PSIZE(bp); int uncompressed = BP_GET_UCSIZE(bp); int64_t delta; dprintf_bp(bp, "ds=%p", 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); ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); if (ds == NULL) { dsl_pool_mos_diduse_space(tx->tx_pool, used, compressed, uncompressed); return; } dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); delta = parent_delta(ds, used); dsl_dataset_phys(ds)->ds_referenced_bytes += used; dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; dsl_dataset_phys(ds)->ds_unique_bytes += used; if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) ds->ds_need_large_blocks = B_TRUE; mutex_exit(&ds->ds_lock); dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, compressed, uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, used - delta, - DD_USED_REFRSRV, DD_USED_HEAD, tx); + DD_USED_REFRSRV, DD_USED_HEAD, NULL); } int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, boolean_t async) { int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); int compressed = BP_GET_PSIZE(bp); int uncompressed = BP_GET_UCSIZE(bp); if (BP_IS_HOLE(bp)) return (0); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(bp->blk_birth <= tx->tx_txg); if (ds == NULL) { dsl_free(tx->tx_pool, tx->tx_txg, bp); dsl_pool_mos_diduse_space(tx->tx_pool, -used, -compressed, -uncompressed); return (used); } ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); ASSERT(!dsl_dataset_is_snapshot(ds)); dmu_buf_will_dirty(ds->ds_dbuf, tx); if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { int64_t delta; dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); dsl_free(tx->tx_pool, tx->tx_txg, bp); mutex_enter(&ds->ds_lock); ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || !DS_UNIQUE_IS_ACCURATE(ds)); delta = parent_delta(ds, -used); dsl_dataset_phys(ds)->ds_unique_bytes -= used; mutex_exit(&ds->ds_lock); dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, -compressed, -uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, -used - delta, - DD_USED_REFRSRV, DD_USED_HEAD, tx); + DD_USED_REFRSRV, DD_USED_HEAD, NULL); } else { dprintf_bp(bp, "putting on dead list: %s", ""); if (async) { /* * We are here as part of zio's write done callback, * which means we're a zio interrupt thread. We can't * call dsl_deadlist_insert() now because it may block * waiting for I/O. Instead, put bp on the deferred * queue and let dsl_pool_sync() finish the job. */ bplist_append(&ds->ds_pending_deadlist, bp); } else { dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); } ASSERT3U(ds->ds_prev->ds_object, ==, dsl_dataset_phys(ds)->ds_prev_snap_obj); ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == ds->ds_object && bp->blk_birth > dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); mutex_enter(&ds->ds_prev->ds_lock); dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; mutex_exit(&ds->ds_prev->ds_lock); } if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { dsl_dir_transfer_space(ds->ds_dir, used, DD_USED_HEAD, DD_USED_SNAP, tx); } } mutex_enter(&ds->ds_lock); ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); dsl_dataset_phys(ds)->ds_referenced_bytes -= used; ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; mutex_exit(&ds->ds_lock); return (used); } 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(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); } boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, uint64_t blk_birth) { if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || (bp != NULL && BP_IS_HOLE(bp))) return (B_FALSE); ddt_prefetch(dsl_dataset_get_spa(ds), bp); return (B_TRUE); } /* ARGSUSED */ static void dsl_dataset_evict(dmu_buf_t *db, void *dsv) { dsl_dataset_t *ds = dsv; ASSERT(ds->ds_owner == NULL); unique_remove(ds->ds_fsid_guid); if (ds->ds_objset != NULL) dmu_objset_evict(ds->ds_objset); if (ds->ds_prev) { dsl_dataset_rele(ds->ds_prev, ds); ds->ds_prev = NULL; } bplist_destroy(&ds->ds_pending_deadlist); if (dsl_dataset_phys(ds)->ds_deadlist_obj != 0) dsl_deadlist_close(&ds->ds_deadlist); if (ds->ds_dir) dsl_dir_rele(ds->ds_dir, ds); ASSERT(!list_link_active(&ds->ds_synced_link)); if (mutex_owned(&ds->ds_lock)) mutex_exit(&ds->ds_lock); mutex_destroy(&ds->ds_lock); if (mutex_owned(&ds->ds_opening_lock)) mutex_exit(&ds->ds_opening_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_sendstream_lock); refcount_destroy(&ds->ds_longholds); kmem_free(ds, sizeof (dsl_dataset_t)); } 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 (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) return (0); err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &headdbuf); if (err != 0) 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); } int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) { objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; matchtype_t mt; int err; if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) mt = MT_FIRST; else mt = MT_EXACT; err = zap_lookup_norm(mos, snapobj, name, 8, 1, value, mt, NULL, 0, NULL); if (err == ENOTSUP && mt == MT_FIRST) err = zap_lookup(mos, snapobj, name, 8, 1, value); return (err); } int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, boolean_t adj_cnt) { objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; matchtype_t mt; int err; dsl_dir_snap_cmtime_update(ds->ds_dir); if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) mt = MT_FIRST; else mt = MT_EXACT; err = zap_remove_norm(mos, snapobj, name, mt, tx); if (err == ENOTSUP && mt == MT_FIRST) err = zap_remove(mos, snapobj, name, tx); if (err == 0 && adj_cnt) dsl_fs_ss_count_adjust(ds->ds_dir, -1, DD_FIELD_SNAPSHOT_COUNT, tx); return (err); } int dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, dsl_dataset_t **dsp) { objset_t *mos = dp->dp_meta_objset; dmu_buf_t *dbuf; dsl_dataset_t *ds; int err; dmu_object_info_t doi; ASSERT(dsl_pool_config_held(dp)); err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); if (err != 0) return (err); /* Make sure dsobj has the correct object type. */ dmu_object_info_from_db(dbuf, &doi); if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { dmu_buf_rele(dbuf, tag); return (SET_ERROR(EINVAL)); } ds = dmu_buf_get_user(dbuf); if (ds == NULL) { dsl_dataset_t *winner = NULL; ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); ds->ds_dbuf = dbuf; ds->ds_object = dsobj; mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); refcount_create(&ds->ds_longholds); bplist_create(&ds->ds_pending_deadlist); dsl_deadlist_open(&ds->ds_deadlist, mos, dsl_dataset_phys(ds)->ds_deadlist_obj); list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), offsetof(dmu_sendarg_t, dsa_link)); if (doi.doi_type == DMU_OTN_ZAP_METADATA) { int zaperr = zap_contains(mos, dsobj, DS_FIELD_LARGE_BLOCKS); if (zaperr != ENOENT) { VERIFY0(zaperr); ds->ds_large_blocks = B_TRUE; } } if (err == 0) { err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); } if (err != 0) { mutex_destroy(&ds->ds_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_sendstream_lock); refcount_destroy(&ds->ds_longholds); bplist_destroy(&ds->ds_pending_deadlist); dsl_deadlist_close(&ds->ds_deadlist); kmem_free(ds, sizeof (dsl_dataset_t)); dmu_buf_rele(dbuf, tag); return (err); } if (!dsl_dataset_is_snapshot(ds)) { ds->ds_snapname[0] = '\0'; if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { err = dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev); } if (doi.doi_type == DMU_OTN_ZAP_METADATA) { int zaperr = zap_lookup(mos, ds->ds_object, DS_FIELD_BOOKMARK_NAMES, sizeof (ds->ds_bookmarks), 1, &ds->ds_bookmarks); if (zaperr != ENOENT) VERIFY0(zaperr); } } else { if (zfs_flags & ZFS_DEBUG_SNAPNAMES) err = dsl_dataset_get_snapname(ds); if (err == 0 && dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { err = zap_count( ds->ds_dir->dd_pool->dp_meta_objset, dsl_dataset_phys(ds)->ds_userrefs_obj, &ds->ds_userrefs); } } if (err == 0 && !dsl_dataset_is_snapshot(ds)) { err = dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &ds->ds_reserved); if (err == 0) { err = dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_REFQUOTA), &ds->ds_quota); } } else { ds->ds_reserved = ds->ds_quota = 0; } if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, dsl_dataset_evict)) != NULL) { bplist_destroy(&ds->ds_pending_deadlist); dsl_deadlist_close(&ds->ds_deadlist); if (ds->ds_prev) dsl_dataset_rele(ds->ds_prev, ds); dsl_dir_rele(ds->ds_dir, ds); mutex_destroy(&ds->ds_lock); mutex_destroy(&ds->ds_opening_lock); mutex_destroy(&ds->ds_sendstream_lock); refcount_destroy(&ds->ds_longholds); kmem_free(ds, sizeof (dsl_dataset_t)); if (err != 0) { dmu_buf_rele(dbuf, tag); return (err); } ds = winner; } else { ds->ds_fsid_guid = unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); } } ASSERT3P(ds->ds_dbuf, ==, dbuf); ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); *dsp = ds; return (0); } int dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, dsl_dataset_t **dsp) { dsl_dir_t *dd; const char *snapname; uint64_t obj; int err = 0; err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); if (err != 0) return (err); ASSERT(dsl_pool_config_held(dp)); obj = dsl_dir_phys(dd)->dd_head_dataset_obj; if (obj != 0) err = dsl_dataset_hold_obj(dp, obj, tag, dsp); else err = SET_ERROR(ENOENT); /* we may be looking for a snapshot */ if (err == 0 && snapname != NULL) { dsl_dataset_t *ds; if (*snapname++ != '@') { dsl_dataset_rele(*dsp, tag); dsl_dir_rele(dd, FTAG); return (SET_ERROR(ENOENT)); } dprintf("looking for snapshot '%s'\n", snapname); err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); if (err == 0) err = dsl_dataset_hold_obj(dp, obj, tag, &ds); dsl_dataset_rele(*dsp, tag); if (err == 0) { mutex_enter(&ds->ds_lock); if (ds->ds_snapname[0] == 0) (void) strlcpy(ds->ds_snapname, snapname, sizeof (ds->ds_snapname)); mutex_exit(&ds->ds_lock); *dsp = ds; } } dsl_dir_rele(dd, FTAG); return (err); } int dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, dsl_dataset_t **dsp) { int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); if (err != 0) return (err); if (!dsl_dataset_tryown(*dsp, tag)) { dsl_dataset_rele(*dsp, tag); *dsp = NULL; return (SET_ERROR(EBUSY)); } return (0); } int dsl_dataset_own(dsl_pool_t *dp, const char *name, void *tag, dsl_dataset_t **dsp) { int err = dsl_dataset_hold(dp, name, tag, dsp); if (err != 0) return (err); if (!dsl_dataset_tryown(*dsp, tag)) { dsl_dataset_rele(*dsp, tag); return (SET_ERROR(EBUSY)); } return (0); } /* * See the comment above dsl_pool_hold() for details. In summary, a long * hold is used to prevent destruction of a dataset while the pool hold * is dropped, allowing other concurrent operations (e.g. spa_sync()). * * The dataset and pool must be held when this function is called. After it * is called, the pool hold may be released while the dataset is still held * and accessed. */ void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) { ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); (void) refcount_add(&ds->ds_longholds, tag); } void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) { (void) refcount_remove(&ds->ds_longholds, tag); } /* Return B_TRUE if there are any long holds on this dataset. */ boolean_t dsl_dataset_long_held(dsl_dataset_t *ds) { return (!refcount_is_zero(&ds->ds_longholds)); } 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); VERIFY0(dsl_dataset_get_snapname(ds)); if (ds->ds_snapname[0]) { (void) strcat(name, "@"); /* * We use a "recursive" mutex so that we * can call dprintf_ds() with ds_lock held. */ if (!MUTEX_HELD(&ds->ds_lock)) { mutex_enter(&ds->ds_lock); (void) strcat(name, ds->ds_snapname); mutex_exit(&ds->ds_lock); } else { (void) strcat(name, ds->ds_snapname); } } } } void dsl_dataset_rele(dsl_dataset_t *ds, void *tag) { dmu_buf_rele(ds->ds_dbuf, tag); } void dsl_dataset_disown(dsl_dataset_t *ds, void *tag) { ASSERT3P(ds->ds_owner, ==, tag); ASSERT(ds->ds_dbuf != NULL); mutex_enter(&ds->ds_lock); ds->ds_owner = NULL; mutex_exit(&ds->ds_lock); dsl_dataset_long_rele(ds, tag); dsl_dataset_rele(ds, tag); } boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) { boolean_t gotit = FALSE; mutex_enter(&ds->ds_lock); if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { ds->ds_owner = tag; dsl_dataset_long_hold(ds, tag); gotit = TRUE; } mutex_exit(&ds->ds_lock); return (gotit); } uint64_t dsl_dataset_create_sync_dd(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; if (origin == NULL) origin = dp->dp_origin_snap; ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(dsl_dir_phys(dd)->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); VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); dsphys = dbuf->db_data; bzero(dsphys, sizeof (dsl_dataset_phys_t)); dsphys->ds_dir_obj = dd->dd_object; dsphys->ds_flags = flags; dsphys->ds_fsid_guid = unique_create(); do { (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, sizeof (dsphys->ds_guid)); } while (dsphys->ds_guid == 0); 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 == TXG_INITIAL ? 1 : tx->tx_txg; if (origin == NULL) { dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); } else { dsl_dataset_t *ohds; /* head of the origin snapshot */ dsphys->ds_prev_snap_obj = origin->ds_object; dsphys->ds_prev_snap_txg = dsl_dataset_phys(origin)->ds_creation_txg; dsphys->ds_referenced_bytes = dsl_dataset_phys(origin)->ds_referenced_bytes; dsphys->ds_compressed_bytes = dsl_dataset_phys(origin)->ds_compressed_bytes; dsphys->ds_uncompressed_bytes = dsl_dataset_phys(origin)->ds_uncompressed_bytes; dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; /* * Inherit flags that describe the dataset's contents * (INCONSISTENT) or properties (Case Insensitive). */ dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); if (origin->ds_large_blocks) dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); dmu_buf_will_dirty(origin->ds_dbuf, tx); dsl_dataset_phys(origin)->ds_num_children++; VERIFY0(dsl_dataset_hold_obj(dp, dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, FTAG, &ohds)); dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); dsl_dataset_rele(ohds, FTAG); if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { dsl_dataset_phys(origin)->ds_next_clones_obj = zap_create(mos, DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); } VERIFY0(zap_add_int(mos, dsl_dataset_phys(origin)->ds_next_clones_obj, dsobj, tx)); } dmu_buf_will_dirty(dd->dd_dbuf, tx); dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); dsl_dir_phys(origin->ds_dir)->dd_clones = zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); } VERIFY0(zap_add_int(mos, dsl_dir_phys(origin->ds_dir)->dd_clones, dsobj, 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); dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; return (dsobj); } static void dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) { objset_t *os; VERIFY0(dmu_objset_from_ds(ds, &os)); bzero(&os->os_zil_header, sizeof (os->os_zil_header)); dsl_dataset_dirty(ds, tx); } 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(dmu_tx_is_syncing(tx)); ASSERT(lastname[0] != '@'); ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); dsobj = dsl_dataset_create_sync_dd(dd, origin, flags & ~DS_CREATE_FLAG_NODIRTY, tx); dsl_deleg_set_create_perms(dd, tx, cr); /* * Since we're creating a new node we know it's a leaf, so we can * initialize the counts if the limit feature is active. */ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { uint64_t cnt = 0; objset_t *os = dd->dd_pool->dp_meta_objset; dsl_dir_zapify(dd, tx); VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (cnt), 1, &cnt, tx)); VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (cnt), 1, &cnt, tx)); } dsl_dir_rele(dd, FTAG); /* * If we are creating a clone, make sure we zero out any stale * data from the origin snapshots zil header. */ if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { dsl_dataset_t *ds; VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); dsl_dataset_zero_zil(ds, tx); dsl_dataset_rele(ds, FTAG); } return (dsobj); } #ifdef __FreeBSD__ /* FreeBSD ioctl compat begin */ struct destroyarg { nvlist_t *nvl; const char *snapname; }; static int dsl_check_snap_cb(const char *name, void *arg) { struct destroyarg *da = arg; dsl_dataset_t *ds; char *dsname; dsname = kmem_asprintf("%s@%s", name, da->snapname); fnvlist_add_boolean(da->nvl, dsname); kmem_free(dsname, strlen(dsname) + 1); return (0); } int dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, nvlist_t *snaps) { struct destroyarg *da; int err; da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); da->nvl = snaps; da->snapname = snapname; err = dmu_objset_find(fsname, dsl_check_snap_cb, da, DS_FIND_CHILDREN); kmem_free(da, sizeof (struct destroyarg)); return (err); } /* FreeBSD ioctl compat end */ #endif /* __FreeBSD__ */ /* * 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. */ void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) { uint64_t mrs_used; uint64_t dlused, dlcomp, dluncomp; ASSERT(!dsl_dataset_is_snapshot(ds)); if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; else mrs_used = 0; dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); ASSERT3U(dlused, <=, mrs_used); dsl_dataset_phys(ds)->ds_unique_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; } void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, dmu_tx_t *tx) { objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; uint64_t count; int err; ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, obj, tx); /* * The err should not be ENOENT, but a bug in a previous version * of the code could cause upgrade_clones_cb() to not set * ds_next_snap_obj when it should, leading to a missing entry. * If we knew that the pool was created after * SPA_VERSION_NEXT_CLONES, we could assert that it isn't * ENOENT. However, at least we can check that we don't have * too many entries in the next_clones_obj even after failing to * remove this one. */ if (err != ENOENT) VERIFY0(err); ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, &count)); ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); } blkptr_t * dsl_dataset_get_blkptr(dsl_dataset_t *ds) { return (&dsl_dataset_phys(ds)->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); dsl_dataset_phys(ds)->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_objset != NULL); if (dsl_dataset_phys(ds)->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)) { /* up the hold count until we can be written out */ dmu_buf_add_ref(ds->ds_dbuf, ds); } } boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds) { for (int t = 0; t < TXG_SIZE; t++) { if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, ds, t)) return (B_TRUE); } return (B_FALSE); } 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. */ ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) return (SET_ERROR(ENOSPC)); /* * Propagate 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); } typedef struct dsl_dataset_snapshot_arg { nvlist_t *ddsa_snaps; nvlist_t *ddsa_props; nvlist_t *ddsa_errors; cred_t *ddsa_cr; } dsl_dataset_snapshot_arg_t; int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) { int error; uint64_t value; ds->ds_trysnap_txg = tx->tx_txg; if (!dmu_tx_is_syncing(tx)) return (0); /* * We don't allow multiple snapshots of the same txg. If there * is already one, try again. */ if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) return (SET_ERROR(EAGAIN)); /* * Check for conflicting snapshot name. */ error = dsl_dataset_snap_lookup(ds, snapname, &value); if (error == 0) return (SET_ERROR(EEXIST)); if (error != ENOENT) return (error); /* * We don't allow taking snapshots of inconsistent datasets, such as * those into which we are currently receiving. However, if we are * creating this snapshot as part of a receive, this check will be * executed atomically with respect to the completion of the receive * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this * case we ignore this, knowing it will be fixed up for us shortly in * dmu_recv_end_sync(). */ if (!recv && DS_IS_INCONSISTENT(ds)) return (SET_ERROR(EBUSY)); /* * Skip the check for temporary snapshots or if we have already checked * the counts in dsl_dataset_snapshot_check. This means we really only * check the count here when we're receiving a stream. */ if (cnt != 0 && cr != NULL) { error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); if (error != 0) return (error); } error = dsl_dataset_snapshot_reserve_space(ds, tx); if (error != 0) return (error); return (0); } static int dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) { dsl_dataset_snapshot_arg_t *ddsa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); nvpair_t *pair; int rv = 0; /* * Pre-compute how many total new snapshots will be created for each * level in the tree and below. This is needed for validating the * snapshot limit when either taking a recursive snapshot or when * taking multiple snapshots. * * The problem is that the counts are not actually adjusted when * we are checking, only when we finally sync. For a single snapshot, * this is easy, the count will increase by 1 at each node up the tree, * but its more complicated for the recursive/multiple snapshot case. * * The dsl_fs_ss_limit_check function does recursively check the count * at each level up the tree but since it is validating each snapshot * independently we need to be sure that we are validating the complete * count for the entire set of snapshots. We do this by rolling up the * counts for each component of the name into an nvlist and then * checking each of those cases with the aggregated count. * * This approach properly handles not only the recursive snapshot * case (where we get all of those on the ddsa_snaps list) but also * the sibling case (e.g. snapshot a/b and a/c so that we will also * validate the limit on 'a' using a count of 2). * * We validate the snapshot names in the third loop and only report * name errors once. */ if (dmu_tx_is_syncing(tx)) { nvlist_t *cnt_track = NULL; cnt_track = fnvlist_alloc(); /* Rollup aggregated counts into the cnt_track list */ for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { char *pdelim; uint64_t val; char nm[MAXPATHLEN]; (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); pdelim = strchr(nm, '@'); if (pdelim == NULL) continue; *pdelim = '\0'; do { if (nvlist_lookup_uint64(cnt_track, nm, &val) == 0) { /* update existing entry */ fnvlist_add_uint64(cnt_track, nm, val + 1); } else { /* add to list */ fnvlist_add_uint64(cnt_track, nm, 1); } pdelim = strrchr(nm, '/'); if (pdelim != NULL) *pdelim = '\0'; } while (pdelim != NULL); } /* Check aggregated counts at each level */ for (pair = nvlist_next_nvpair(cnt_track, NULL); pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { int error = 0; char *name; uint64_t cnt = 0; dsl_dataset_t *ds; name = nvpair_name(pair); cnt = fnvpair_value_uint64(pair); ASSERT(cnt > 0); error = dsl_dataset_hold(dp, name, FTAG, &ds); if (error == 0) { error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, ZFS_PROP_SNAPSHOT_LIMIT, NULL, ddsa->ddsa_cr); dsl_dataset_rele(ds, FTAG); } if (error != 0) { if (ddsa->ddsa_errors != NULL) fnvlist_add_int32(ddsa->ddsa_errors, name, error); rv = error; /* only report one error for this check */ break; } } nvlist_free(cnt_track); } for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { int error = 0; dsl_dataset_t *ds; char *name, *atp; char dsname[MAXNAMELEN]; name = nvpair_name(pair); if (strlen(name) >= MAXNAMELEN) error = SET_ERROR(ENAMETOOLONG); if (error == 0) { atp = strchr(name, '@'); if (atp == NULL) error = SET_ERROR(EINVAL); if (error == 0) (void) strlcpy(dsname, name, atp - name + 1); } if (error == 0) error = dsl_dataset_hold(dp, dsname, FTAG, &ds); if (error == 0) { /* passing 0/NULL skips dsl_fs_ss_limit_check */ error = dsl_dataset_snapshot_check_impl(ds, atp + 1, tx, B_FALSE, 0, NULL); dsl_dataset_rele(ds, FTAG); } if (error != 0) { if (ddsa->ddsa_errors != NULL) { fnvlist_add_int32(ddsa->ddsa_errors, name, error); } rv = error; } } return (rv); } void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, dmu_tx_t *tx) { static zil_header_t zero_zil; dsl_pool_t *dp = ds->ds_dir->dd_pool; dmu_buf_t *dbuf; dsl_dataset_phys_t *dsphys; uint64_t dsobj, crtxg; objset_t *mos = dp->dp_meta_objset; objset_t *os; ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); /* * If we are on an old pool, the zil must not be active, in which * case it will be zeroed. Usually zil_suspend() accomplishes this. */ ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || dmu_objset_from_ds(ds, &os) != 0 || bcmp(&os->os_phys->os_zil_header, &zero_zil, sizeof (zero_zil)) == 0); dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); /* * The origin's ds_creation_txg has to be < TXG_INITIAL */ if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) crtxg = 1; else crtxg = tx->tx_txg; dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); dsphys = dbuf->db_data; bzero(dsphys, sizeof (dsl_dataset_phys_t)); dsphys->ds_dir_obj = ds->ds_dir->dd_object; dsphys->ds_fsid_guid = unique_create(); do { (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, sizeof (dsphys->ds_guid)); } while (dsphys->ds_guid == 0); dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->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 = crtxg; dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; dsphys->ds_uncompressed_bytes = dsl_dataset_phys(ds)->ds_uncompressed_bytes; dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; dmu_buf_rele(dbuf, FTAG); if (ds->ds_large_blocks) dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); ASSERT3U(ds->ds_prev != 0, ==, dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); if (ds->ds_prev) { uint64_t next_clones_obj = dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == ds->ds_object || dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == ds->ds_object) { dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; } else if (next_clones_obj != 0) { dsl_dataset_remove_from_next_clones(ds->ds_prev, dsphys->ds_next_snap_obj, tx); VERIFY0(zap_add_int(mos, next_clones_obj, dsobj, tx)); } } /* * 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 delta; ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); } dmu_buf_will_dirty(ds->ds_dbuf, tx); dsl_dataset_phys(ds)->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); dsl_deadlist_close(&ds->ds_deadlist); dsl_deadlist_open(&ds->ds_deadlist, mos, dsl_dataset_phys(ds)->ds_deadlist_obj); dsl_deadlist_add_key(&ds->ds_deadlist, dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; dsl_dataset_phys(ds)->ds_unique_bytes = 0; if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, snapname, 8, 1, &dsobj, tx)); if (ds->ds_prev) dsl_dataset_rele(ds->ds_prev, ds); VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); dsl_scan_ds_snapshotted(ds, tx); dsl_dir_snap_cmtime_update(ds->ds_dir); spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); } static void dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_snapshot_arg_t *ddsa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); nvpair_t *pair; for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { dsl_dataset_t *ds; char *name, *atp; char dsname[MAXNAMELEN]; name = nvpair_name(pair); atp = strchr(name, '@'); (void) strlcpy(dsname, name, atp - name + 1); VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); if (ddsa->ddsa_props != NULL) { dsl_props_set_sync_impl(ds->ds_prev, ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); } dsl_dataset_rele(ds, FTAG); } } /* * The snapshots must all be in the same pool. * All-or-nothing: if there are any failures, nothing will be modified. */ int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) { dsl_dataset_snapshot_arg_t ddsa; nvpair_t *pair; boolean_t needsuspend; int error; spa_t *spa; char *firstname; nvlist_t *suspended = NULL; pair = nvlist_next_nvpair(snaps, NULL); if (pair == NULL) return (0); firstname = nvpair_name(pair); error = spa_open(firstname, &spa, FTAG); if (error != 0) return (error); needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); spa_close(spa, FTAG); if (needsuspend) { suspended = fnvlist_alloc(); for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; pair = nvlist_next_nvpair(snaps, pair)) { char fsname[MAXNAMELEN]; char *snapname = nvpair_name(pair); char *atp; void *cookie; atp = strchr(snapname, '@'); if (atp == NULL) { error = SET_ERROR(EINVAL); break; } (void) strlcpy(fsname, snapname, atp - snapname + 1); error = zil_suspend(fsname, &cookie); if (error != 0) break; fnvlist_add_uint64(suspended, fsname, (uintptr_t)cookie); } } ddsa.ddsa_snaps = snaps; ddsa.ddsa_props = props; ddsa.ddsa_errors = errors; ddsa.ddsa_cr = CRED(); if (error == 0) { error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, dsl_dataset_snapshot_sync, &ddsa, fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); } if (suspended != NULL) { for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; pair = nvlist_next_nvpair(suspended, pair)) { zil_resume((void *)(uintptr_t) fnvpair_value_uint64(pair)); } fnvlist_free(suspended); } #ifdef __FreeBSD__ #ifdef _KERNEL if (error == 0) { for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; pair = nvlist_next_nvpair(snaps, pair)) { char *snapname = nvpair_name(pair); zvol_create_minors(snapname); } } #endif #endif return (error); } typedef struct dsl_dataset_snapshot_tmp_arg { const char *ddsta_fsname; const char *ddsta_snapname; minor_t ddsta_cleanup_minor; const char *ddsta_htag; } dsl_dataset_snapshot_tmp_arg_t; static int dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) { dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; int error; error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); if (error != 0) return (error); /* NULL cred means no limit check for tmp snapshot */ error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, tx, B_FALSE, 0, NULL); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(ENOTSUP)); } error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, B_TRUE, tx); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } dsl_dataset_rele(ds, FTAG); return (0); } static void dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); dsl_dataset_rele(ds, FTAG); } int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, minor_t cleanup_minor, const char *htag) { dsl_dataset_snapshot_tmp_arg_t ddsta; int error; spa_t *spa; boolean_t needsuspend; void *cookie; ddsta.ddsta_fsname = fsname; ddsta.ddsta_snapname = snapname; ddsta.ddsta_cleanup_minor = cleanup_minor; ddsta.ddsta_htag = htag; error = spa_open(fsname, &spa, FTAG); if (error != 0) return (error); needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); spa_close(spa, FTAG); if (needsuspend) { error = zil_suspend(fsname, &cookie); if (error != 0) return (error); } error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); if (needsuspend) zil_resume(cookie); return (error); } void dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) { ASSERT(dmu_tx_is_syncing(tx)); ASSERT(ds->ds_objset != NULL); ASSERT(dsl_dataset_phys(ds)->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); dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; dmu_objset_sync(ds->ds_objset, zio, tx); if (ds->ds_need_large_blocks && !ds->ds_large_blocks) { dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); ds->ds_large_blocks = B_TRUE; } } static void get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) { uint64_t count = 0; objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; zap_cursor_t zc; zap_attribute_t za; nvlist_t *propval = fnvlist_alloc(); nvlist_t *val = fnvlist_alloc(); ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); /* * There may be missing entries in ds_next_clones_obj * due to a bug in a previous version of the code. * Only trust it if it has the right number of entries. */ if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, &count)); } if (count != dsl_dataset_phys(ds)->ds_num_children - 1) goto fail; for (zap_cursor_init(&zc, mos, dsl_dataset_phys(ds)->ds_next_clones_obj); zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { dsl_dataset_t *clone; char buf[ZFS_MAXNAMELEN]; VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, za.za_first_integer, FTAG, &clone)); dsl_dir_name(clone->ds_dir, buf); fnvlist_add_boolean(val, buf); dsl_dataset_rele(clone, FTAG); } zap_cursor_fini(&zc); fnvlist_add_nvlist(propval, ZPROP_VALUE, val); fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); fail: nvlist_free(val); nvlist_free(propval); } void dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) { dsl_pool_t *dp = ds->ds_dir->dd_pool; uint64_t refd, avail, uobjs, aobjs, ratio; ASSERT(dsl_pool_config_held(dp)); ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / dsl_dataset_phys(ds)->ds_compressed_bytes); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, dsl_dataset_phys(ds)->ds_uncompressed_bytes); if (dsl_dataset_is_snapshot(ds)) { dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, dsl_dataset_phys(ds)->ds_unique_bytes); get_clones_stat(ds, nv); } else { if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { char buf[MAXNAMELEN]; dsl_dataset_name(ds->ds_prev, buf); dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); } 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, dsl_dataset_phys(ds)->ds_creation_time); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, dsl_dataset_phys(ds)->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, dsl_dataset_phys(ds)->ds_guid); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, dsl_dataset_phys(ds)->ds_unique_bytes); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, ds->ds_object); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, ds->ds_userrefs); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, DS_IS_DEFER_DESTROY(ds) ? 1 : 0); if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { uint64_t written, comp, uncomp; dsl_pool_t *dp = ds->ds_dir->dd_pool; dsl_dataset_t *prev; int err = dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); if (err == 0) { err = dsl_dataset_space_written(prev, ds, &written, &comp, &uncomp); dsl_dataset_rele(prev, FTAG); if (err == 0) { dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, written); } } } } void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) { dsl_pool_t *dp = ds->ds_dir->dd_pool; ASSERT(dsl_pool_config_held(dp)); stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; stat->dds_inconsistent = dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; stat->dds_origin[0] = '\0'; if (dsl_dataset_is_snapshot(ds)) { stat->dds_is_snapshot = B_TRUE; stat->dds_num_clones = dsl_dataset_phys(ds)->ds_num_children - 1; } else { stat->dds_is_snapshot = B_FALSE; stat->dds_num_clones = 0; if (dsl_dir_is_clone(ds->ds_dir)) { dsl_dataset_t *ods; VERIFY0(dsl_dataset_hold_obj(dp, dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &ods)); dsl_dataset_name(ods, stat->dds_origin); dsl_dataset_rele(ods, FTAG); } } } 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 = dsl_dataset_phys(ds)->ds_referenced_bytes; *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) *availbytesp += ds->ds_reserved - dsl_dataset_phys(ds)->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 = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); *availobjsp = DN_MAX_OBJECT - *usedobjsp; } boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) { dsl_pool_t *dp = ds->ds_dir->dd_pool; ASSERT(dsl_pool_config_held(dp)); if (snap == NULL) return (B_FALSE); if (dsl_dataset_phys(ds)->ds_bp.blk_birth > dsl_dataset_phys(snap)->ds_creation_txg) { objset_t *os, *os_snap; /* * It may be that only the ZIL differs, because it was * reset in the head. Don't count that as being * modified. */ if (dmu_objset_from_ds(ds, &os) != 0) return (B_TRUE); if (dmu_objset_from_ds(snap, &os_snap) != 0) return (B_TRUE); return (bcmp(&os->os_phys->os_meta_dnode, &os_snap->os_phys->os_meta_dnode, sizeof (os->os_phys->os_meta_dnode)) != 0); } return (B_FALSE); } typedef struct dsl_dataset_rename_snapshot_arg { const char *ddrsa_fsname; const char *ddrsa_oldsnapname; const char *ddrsa_newsnapname; boolean_t ddrsa_recursive; dmu_tx_t *ddrsa_tx; } dsl_dataset_rename_snapshot_arg_t; /* ARGSUSED */ static int dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) { dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; int error; uint64_t val; error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); if (error != 0) { /* ignore nonexistent snapshots */ return (error == ENOENT ? 0 : error); } /* new name should not exist */ error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); if (error == 0) error = SET_ERROR(EEXIST); else if (error == ENOENT) error = 0; /* dataset name + 1 for the "@" + the new snapshot name must fit */ if (dsl_dir_namelen(hds->ds_dir) + 1 + strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) error = SET_ERROR(ENAMETOOLONG); return (error); } static int dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) { dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *hds; int error; error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); if (error != 0) return (error); if (ddrsa->ddrsa_recursive) { error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, dsl_dataset_rename_snapshot_check_impl, ddrsa, DS_FIND_CHILDREN); } else { error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); } dsl_dataset_rele(hds, FTAG); return (error); } static int dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) { #ifdef __FreeBSD__ #ifdef _KERNEL char *oldname, *newname; #endif #endif dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; dsl_dataset_t *ds; uint64_t val; dmu_tx_t *tx = ddrsa->ddrsa_tx; int error; error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); ASSERT(error == 0 || error == ENOENT); if (error == ENOENT) { /* ignore nonexistent snapshots */ return (0); } VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); /* log before we change the name */ spa_history_log_internal_ds(ds, "rename", tx, "-> @%s", ddrsa->ddrsa_newsnapname); VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, B_FALSE)); mutex_enter(&ds->ds_lock); (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); mutex_exit(&ds->ds_lock); VERIFY0(zap_add(dp->dp_meta_objset, dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 8, 1, &ds->ds_object, tx)); #ifdef __FreeBSD__ #ifdef _KERNEL oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, ddrsa->ddrsa_oldsnapname); snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, ddrsa->ddrsa_newsnapname); zfsvfs_update_fromname(oldname, newname); zvol_rename_minors(oldname, newname); kmem_free(newname, MAXPATHLEN); kmem_free(oldname, MAXPATHLEN); #endif #endif dsl_dataset_rele(ds, FTAG); return (0); } static void dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *hds; VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); ddrsa->ddrsa_tx = tx; if (ddrsa->ddrsa_recursive) { VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, dsl_dataset_rename_snapshot_sync_impl, ddrsa, DS_FIND_CHILDREN)); } else { VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); } dsl_dataset_rele(hds, FTAG); } int dsl_dataset_rename_snapshot(const char *fsname, const char *oldsnapname, const char *newsnapname, boolean_t recursive) { dsl_dataset_rename_snapshot_arg_t ddrsa; ddrsa.ddrsa_fsname = fsname; ddrsa.ddrsa_oldsnapname = oldsnapname; ddrsa.ddrsa_newsnapname = newsnapname; ddrsa.ddrsa_recursive = recursive; return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, dsl_dataset_rename_snapshot_sync, &ddrsa, 1, ZFS_SPACE_CHECK_RESERVED)); } /* * If we're doing an ownership handoff, we need to make sure that there is * only one long hold on the dataset. We're not allowed to change anything here * so we don't permanently release the long hold or regular hold here. We want * to do this only when syncing to avoid the dataset unexpectedly going away * when we release the long hold. */ static int dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) { boolean_t held; if (!dmu_tx_is_syncing(tx)) return (0); if (owner != NULL) { VERIFY3P(ds->ds_owner, ==, owner); dsl_dataset_long_rele(ds, owner); } held = dsl_dataset_long_held(ds); if (owner != NULL) dsl_dataset_long_hold(ds, owner); if (held) return (SET_ERROR(EBUSY)); return (0); } typedef struct dsl_dataset_rollback_arg { const char *ddra_fsname; void *ddra_owner; nvlist_t *ddra_result; } dsl_dataset_rollback_arg_t; static int dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) { dsl_dataset_rollback_arg_t *ddra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; int64_t unused_refres_delta; int error; error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); if (error != 0) return (error); /* must not be a snapshot */ if (dsl_dataset_is_snapshot(ds)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EINVAL)); } /* must have a most recent snapshot */ if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EINVAL)); } /* must not have any bookmarks after the most recent snapshot */ nvlist_t *proprequest = fnvlist_alloc(); fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); nvlist_t *bookmarks = fnvlist_alloc(); error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); fnvlist_free(proprequest); if (error != 0) return (error); for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { nvlist_t *valuenv = fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), zfs_prop_to_name(ZFS_PROP_CREATETXG)); uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { fnvlist_free(bookmarks); dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EEXIST)); } } fnvlist_free(bookmarks); error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } /* * Check if the snap we are rolling back to uses more than * the refquota. */ if (ds->ds_quota != 0 && dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EDQUOT)); } /* * When we do the clone swap, we will temporarily use more space * due to the refreservation (the head will no longer have any * unique space, so the entire amount of the refreservation will need * to be free). We will immediately destroy the clone, freeing * this space, but the freeing happens over many txg's. */ unused_refres_delta = (int64_t)MIN(ds->ds_reserved, dsl_dataset_phys(ds)->ds_unique_bytes); if (unused_refres_delta > 0 && unused_refres_delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(ENOSPC)); } dsl_dataset_rele(ds, FTAG); return (0); } static void dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_rollback_arg_t *ddra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds, *clone; uint64_t cloneobj; char namebuf[ZFS_MAXNAMELEN]; VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); dsl_dataset_name(ds->ds_prev, namebuf); fnvlist_add_string(ddra->ddra_result, "target", namebuf); cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); dsl_dataset_clone_swap_sync_impl(clone, ds, tx); dsl_dataset_zero_zil(ds, tx); dsl_destroy_head_sync_impl(clone, tx); dsl_dataset_rele(clone, FTAG); dsl_dataset_rele(ds, FTAG); } /* * Rolls back the given filesystem or volume to the most recent snapshot. * The name of the most recent snapshot will be returned under key "target" * in the result nvlist. * * If owner != NULL: * - The existing dataset MUST be owned by the specified owner at entry * - Upon return, dataset will still be held by the same owner, whether we * succeed or not. * * This mode is required any time the existing filesystem is mounted. See * notes above zfs_suspend_fs() for further details. */ int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) { dsl_dataset_rollback_arg_t ddra; ddra.ddra_fsname = fsname; ddra.ddra_owner = owner; ddra.ddra_result = result; return (dsl_sync_task(fsname, dsl_dataset_rollback_check, dsl_dataset_rollback_sync, &ddra, 1, ZFS_SPACE_CHECK_RESERVED)); } struct promotenode { list_node_t link; dsl_dataset_t *ds; }; typedef struct dsl_dataset_promote_arg { const char *ddpa_clonename; dsl_dataset_t *ddpa_clone; list_t shared_snaps, origin_snaps, clone_snaps; dsl_dataset_t *origin_origin; /* origin of the origin */ uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; char *err_ds; cred_t *cr; } dsl_dataset_promote_arg_t; static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag); static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); static int dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) { dsl_dataset_promote_arg_t *ddpa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *hds; struct promotenode *snap; dsl_dataset_t *origin_ds; int err; uint64_t unused; uint64_t ss_mv_cnt; err = promote_hold(ddpa, dp, FTAG); if (err != 0) return (err); hds = ddpa->ddpa_clone; if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { promote_rele(ddpa, FTAG); return (SET_ERROR(EXDEV)); } /* * Compute and check the amount of space to transfer. Since this is * so expensive, don't do the preliminary check. */ if (!dmu_tx_is_syncing(tx)) { promote_rele(ddpa, FTAG); return (0); } snap = list_head(&ddpa->shared_snaps); origin_ds = snap->ds; /* compute origin's new unique space */ snap = list_tail(&ddpa->clone_snaps); ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, origin_ds->ds_object); dsl_deadlist_space_range(&snap->ds->ds_deadlist, dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, &ddpa->unique, &unused, &unused); /* * Walk the snapshots that we are moving * * Compute space to transfer. Consider the incremental changes * to used by each snapshot: * (my used) = (prev's used) + (blocks born) - (blocks killed) * So each snapshot gave birth to: * (blocks born) = (my used) - (prev's used) + (blocks killed) * So a sequence would look like: * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) * Which simplifies to: * uN + kN + kN-1 + ... + k1 + k0 * Note however, if we stop before we reach the ORIGIN we get: * uN + kN + kN-1 + ... + kM - uM-1 */ ss_mv_cnt = 0; ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; for (snap = list_head(&ddpa->shared_snaps); snap; snap = list_next(&ddpa->shared_snaps, snap)) { uint64_t val, dlused, dlcomp, dluncomp; dsl_dataset_t *ds = snap->ds; ss_mv_cnt++; /* * If there are long holds, we won't be able to evict * the objset. */ if (dsl_dataset_long_held(ds)) { err = SET_ERROR(EBUSY); goto out; } /* Check that the snapshot name does not conflict */ VERIFY0(dsl_dataset_get_snapname(ds)); err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); if (err == 0) { (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); err = SET_ERROR(EEXIST); goto out; } if (err != ENOENT) goto out; /* The very first snapshot does not have a deadlist */ if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) continue; dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); ddpa->used += dlused; ddpa->comp += dlcomp; ddpa->uncomp += dluncomp; } /* * If we are a clone of a clone then we never reached ORIGIN, * so we need to subtract out the clone origin's used space. */ if (ddpa->origin_origin) { ddpa->used -= dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; ddpa->comp -= dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; ddpa->uncomp -= dsl_dataset_phys(ddpa->origin_origin)-> ds_uncompressed_bytes; } /* Check that there is enough space and limit headroom here */ err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 0, ss_mv_cnt, ddpa->used, ddpa->cr); if (err != 0) goto out; /* * Compute the amounts of space that will be used by snapshots * after the promotion (for both origin and clone). For each, * it is the amount of space that will be on all of their * deadlists (that was not born before their new origin). */ if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { uint64_t space; /* * Note, typically this will not be a clone of a clone, * so dd_origin_txg will be < TXG_INITIAL, so * these snaplist_space() -> dsl_deadlist_space_range() * calls will be fast because they do not have to * iterate over all bps. */ snap = list_head(&ddpa->origin_snaps); err = snaplist_space(&ddpa->shared_snaps, snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); if (err != 0) goto out; err = snaplist_space(&ddpa->clone_snaps, snap->ds->ds_dir->dd_origin_txg, &space); if (err != 0) goto out; ddpa->cloneusedsnap += space; } if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { err = snaplist_space(&ddpa->origin_snaps, dsl_dataset_phys(origin_ds)->ds_creation_txg, &ddpa->originusedsnap); if (err != 0) goto out; } out: promote_rele(ddpa, FTAG); return (err); } static void dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_promote_arg_t *ddpa = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *hds; struct promotenode *snap; dsl_dataset_t *origin_ds; dsl_dataset_t *origin_head; dsl_dir_t *dd; dsl_dir_t *odd = NULL; uint64_t oldnext_obj; int64_t delta; #if defined(__FreeBSD__) && defined(_KERNEL) char *oldname, *newname; #endif VERIFY0(promote_hold(ddpa, dp, FTAG)); hds = ddpa->ddpa_clone; ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); snap = list_head(&ddpa->shared_snaps); origin_ds = snap->ds; dd = hds->ds_dir; snap = list_head(&ddpa->origin_snaps); origin_head = snap->ds; /* * We need to explicitly open odd, since origin_ds's dd will be * changing. */ VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, NULL, FTAG, &odd)); /* change origin's next snap */ dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; snap = list_tail(&ddpa->clone_snaps); ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, origin_ds->ds_object); dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; /* change the origin's next clone */ if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { dsl_dataset_remove_from_next_clones(origin_ds, snap->ds->ds_object, tx); VERIFY0(zap_add_int(dp->dp_meta_objset, dsl_dataset_phys(origin_ds)->ds_next_clones_obj, oldnext_obj, tx)); } /* change origin */ dmu_buf_will_dirty(dd->dd_dbuf, tx); ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; dmu_buf_will_dirty(odd->dd_dbuf, tx); dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; origin_head->ds_dir->dd_origin_txg = dsl_dataset_phys(origin_ds)->ds_creation_txg; /* change dd_clone entries */ if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { VERIFY0(zap_remove_int(dp->dp_meta_objset, dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); VERIFY0(zap_add_int(dp->dp_meta_objset, dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, hds->ds_object, tx)); VERIFY0(zap_remove_int(dp->dp_meta_objset, dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, origin_head->ds_object, tx)); if (dsl_dir_phys(dd)->dd_clones == 0) { dsl_dir_phys(dd)->dd_clones = zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); } VERIFY0(zap_add_int(dp->dp_meta_objset, dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); } #if defined(__FreeBSD__) && defined(_KERNEL) /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ mutex_enter(&spa_namespace_lock); oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); #endif /* move snapshots to this dir */ for (snap = list_head(&ddpa->shared_snaps); snap; snap = list_next(&ddpa->shared_snaps, snap)) { dsl_dataset_t *ds = snap->ds; /* * Property callbacks are registered to a particular * dsl_dir. Since ours is changing, evict the objset * so that they will be unregistered from the old dsl_dir. */ if (ds->ds_objset) { dmu_objset_evict(ds->ds_objset); ds->ds_objset = NULL; } /* move snap name entry */ VERIFY0(dsl_dataset_get_snapname(ds)); VERIFY0(dsl_dataset_snap_remove(origin_head, ds->ds_snapname, tx, B_TRUE)); VERIFY0(zap_add(dp->dp_meta_objset, dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 8, 1, &ds->ds_object, tx)); dsl_fs_ss_count_adjust(hds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); /* change containing dsl_dir */ dmu_buf_will_dirty(ds->ds_dbuf, tx); ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; ASSERT3P(ds->ds_dir, ==, odd); dsl_dir_rele(ds->ds_dir, ds); VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, NULL, ds, &ds->ds_dir)); #if defined(__FreeBSD__) && defined(_KERNEL) dsl_dataset_name(ds, newname); zfsvfs_update_fromname(oldname, newname); zvol_rename_minors(oldname, newname); #endif /* move any clone references */ if (dsl_dataset_phys(ds)->ds_next_clones_obj && spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { zap_cursor_t zc; zap_attribute_t za; for (zap_cursor_init(&zc, dp->dp_meta_objset, dsl_dataset_phys(ds)->ds_next_clones_obj); zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { dsl_dataset_t *cnds; uint64_t o; if (za.za_first_integer == oldnext_obj) { /* * We've already moved the * origin's reference. */ continue; } VERIFY0(dsl_dataset_hold_obj(dp, za.za_first_integer, FTAG, &cnds)); o = dsl_dir_phys(cnds->ds_dir)-> dd_head_dataset_obj; VERIFY0(zap_remove_int(dp->dp_meta_objset, dsl_dir_phys(odd)->dd_clones, o, tx)); VERIFY0(zap_add_int(dp->dp_meta_objset, dsl_dir_phys(dd)->dd_clones, o, tx)); dsl_dataset_rele(cnds, FTAG); } zap_cursor_fini(&zc); } ASSERT(!dsl_prop_hascb(ds)); } #if defined(__FreeBSD__) && defined(_KERNEL) mutex_exit(&spa_namespace_lock); kmem_free(newname, MAXPATHLEN); kmem_free(oldname, MAXPATHLEN); #endif /* * Change space accounting. * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either * both be valid, or both be 0 (resulting in delta == 0). This * is true for each of {clone,origin} independently. */ delta = ddpa->cloneusedsnap - dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; ASSERT3S(delta, >=, 0); ASSERT3U(ddpa->used, >=, delta); dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); dsl_dir_diduse_space(dd, DD_USED_HEAD, ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); delta = ddpa->originusedsnap - dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; ASSERT3S(delta, <=, 0); ASSERT3U(ddpa->used, >=, -delta); dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); dsl_dir_diduse_space(odd, DD_USED_HEAD, -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; /* log history record */ spa_history_log_internal_ds(hds, "promote", tx, ""); dsl_dir_rele(odd, FTAG); promote_rele(ddpa, FTAG); } /* * Make a list of dsl_dataset_t's for the snapshots between first_obj * (exclusive) and last_obj (inclusive). The list will be in reverse * order (last_obj will be the list_head()). If first_obj == 0, do all * snapshots back to this dataset's origin. */ static int snaplist_make(dsl_pool_t *dp, uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) { uint64_t obj = last_obj; list_create(l, sizeof (struct promotenode), offsetof(struct promotenode, link)); while (obj != first_obj) { dsl_dataset_t *ds; struct promotenode *snap; int err; err = dsl_dataset_hold_obj(dp, obj, tag, &ds); ASSERT(err != ENOENT); if (err != 0) return (err); if (first_obj == 0) first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; snap = kmem_alloc(sizeof (*snap), KM_SLEEP); snap->ds = ds; list_insert_tail(l, snap); obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; } return (0); } static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) { struct promotenode *snap; *spacep = 0; for (snap = list_head(l); snap; snap = list_next(l, snap)) { uint64_t used, comp, uncomp; dsl_deadlist_space_range(&snap->ds->ds_deadlist, mintxg, UINT64_MAX, &used, &comp, &uncomp); *spacep += used; } return (0); } static void snaplist_destroy(list_t *l, void *tag) { struct promotenode *snap; if (l == NULL || !list_link_active(&l->list_head)) return; while ((snap = list_tail(l)) != NULL) { list_remove(l, snap); dsl_dataset_rele(snap->ds, tag); kmem_free(snap, sizeof (*snap)); } list_destroy(l); } static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) { int error; dsl_dir_t *dd; struct promotenode *snap; error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, &ddpa->ddpa_clone); if (error != 0) return (error); dd = ddpa->ddpa_clone->ds_dir; if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || !dsl_dir_is_clone(dd)) { dsl_dataset_rele(ddpa->ddpa_clone, tag); return (SET_ERROR(EINVAL)); } error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, &ddpa->shared_snaps, tag); if (error != 0) goto out; error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, &ddpa->clone_snaps, tag); if (error != 0) goto out; snap = list_head(&ddpa->shared_snaps); ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, &ddpa->origin_snaps, tag); if (error != 0) goto out; if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { error = dsl_dataset_hold_obj(dp, dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, tag, &ddpa->origin_origin); if (error != 0) goto out; } out: if (error != 0) promote_rele(ddpa, tag); return (error); } static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) { snaplist_destroy(&ddpa->shared_snaps, tag); snaplist_destroy(&ddpa->clone_snaps, tag); snaplist_destroy(&ddpa->origin_snaps, tag); if (ddpa->origin_origin != NULL) dsl_dataset_rele(ddpa->origin_origin, tag); dsl_dataset_rele(ddpa->ddpa_clone, tag); } /* * Promote a clone. * * If it fails due to a conflicting snapshot name, "conflsnap" will be filled * in with the name. (It must be at least MAXNAMELEN bytes long.) */ int dsl_dataset_promote(const char *name, char *conflsnap) { dsl_dataset_promote_arg_t ddpa = { 0 }; uint64_t numsnaps; int error; objset_t *os; /* * We will modify space proportional to the number of * snapshots. Compute numsnaps. */ error = dmu_objset_hold(name, FTAG, &os); if (error != 0) return (error); error = zap_count(dmu_objset_pool(os)->dp_meta_objset, dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, &numsnaps); dmu_objset_rele(os, FTAG); if (error != 0) return (error); ddpa.ddpa_clonename = name; ddpa.err_ds = conflsnap; ddpa.cr = CRED(); return (dsl_sync_task(name, dsl_dataset_promote_check, dsl_dataset_promote_sync, &ddpa, 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); } int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) { int64_t unused_refres_delta; /* they should both be heads */ if (dsl_dataset_is_snapshot(clone) || dsl_dataset_is_snapshot(origin_head)) return (SET_ERROR(EINVAL)); /* if we are not forcing, the branch point should be just before them */ if (!force && clone->ds_prev != origin_head->ds_prev) return (SET_ERROR(EINVAL)); /* clone should be the clone (unless they are unrelated) */ if (clone->ds_prev != NULL && clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && origin_head->ds_dir != clone->ds_prev->ds_dir) return (SET_ERROR(EINVAL)); /* the clone should be a child of the origin */ if (clone->ds_dir->dd_parent != origin_head->ds_dir) return (SET_ERROR(EINVAL)); /* origin_head shouldn't be modified unless 'force' */ if (!force && dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) return (SET_ERROR(ETXTBSY)); /* origin_head should have no long holds (e.g. is not mounted) */ if (dsl_dataset_handoff_check(origin_head, owner, tx)) return (SET_ERROR(EBUSY)); /* check amount of any unconsumed refreservation */ unused_refres_delta = (int64_t)MIN(origin_head->ds_reserved, dsl_dataset_phys(origin_head)->ds_unique_bytes) - (int64_t)MIN(origin_head->ds_reserved, dsl_dataset_phys(clone)->ds_unique_bytes); if (unused_refres_delta > 0 && unused_refres_delta > dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) return (SET_ERROR(ENOSPC)); /* clone can't be over the head's refquota */ if (origin_head->ds_quota != 0 && dsl_dataset_phys(clone)->ds_referenced_bytes > origin_head->ds_quota) return (SET_ERROR(EDQUOT)); return (0); } void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, dsl_dataset_t *origin_head, dmu_tx_t *tx) { dsl_pool_t *dp = dmu_tx_pool(tx); int64_t unused_refres_delta; ASSERT(clone->ds_reserved == 0); ASSERT(origin_head->ds_quota == 0 || dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); dmu_buf_will_dirty(clone->ds_dbuf, tx); dmu_buf_will_dirty(origin_head->ds_dbuf, tx); if (clone->ds_objset != NULL) { dmu_objset_evict(clone->ds_objset); clone->ds_objset = NULL; } if (origin_head->ds_objset != NULL) { dmu_objset_evict(origin_head->ds_objset); origin_head->ds_objset = NULL; } unused_refres_delta = (int64_t)MIN(origin_head->ds_reserved, dsl_dataset_phys(origin_head)->ds_unique_bytes) - (int64_t)MIN(origin_head->ds_reserved, dsl_dataset_phys(clone)->ds_unique_bytes); /* * Reset origin's unique bytes, if it exists. */ if (clone->ds_prev) { dsl_dataset_t *origin = clone->ds_prev; uint64_t comp, uncomp; dmu_buf_will_dirty(origin->ds_dbuf, tx); dsl_deadlist_space_range(&clone->ds_deadlist, dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); } /* swap blkptrs */ { blkptr_t tmp; tmp = dsl_dataset_phys(origin_head)->ds_bp; dsl_dataset_phys(origin_head)->ds_bp = dsl_dataset_phys(clone)->ds_bp; dsl_dataset_phys(clone)->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; ASSERT3U(dsl_dir_phys(clone->ds_dir)-> dd_used_breakdown[DD_USED_SNAP], ==, 0); dsl_deadlist_space(&clone->ds_deadlist, &cdl_used, &cdl_comp, &cdl_uncomp); dsl_deadlist_space(&origin_head->ds_deadlist, &odl_used, &odl_comp, &odl_uncomp); dused = dsl_dataset_phys(clone)->ds_referenced_bytes + cdl_used - (dsl_dataset_phys(origin_head)->ds_referenced_bytes + odl_used); dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + cdl_comp - (dsl_dataset_phys(origin_head)->ds_compressed_bytes + odl_comp); duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + cdl_uncomp - (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + odl_uncomp); dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, dused, dcomp, duncomp, tx); dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, -dused, -dcomp, -duncomp, tx); /* * The difference in the space used by snapshots is the * difference in snapshot space due to the head's * deadlist (since that's the only thing that's * changing that affects the snapused). */ dsl_deadlist_space_range(&clone->ds_deadlist, origin_head->ds_dir->dd_origin_txg, UINT64_MAX, &cdl_used, &cdl_comp, &cdl_uncomp); dsl_deadlist_space_range(&origin_head->ds_deadlist, origin_head->ds_dir->dd_origin_txg, UINT64_MAX, &odl_used, &odl_comp, &odl_uncomp); dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, - DD_USED_HEAD, DD_USED_SNAP, tx); + DD_USED_HEAD, DD_USED_SNAP, NULL); } /* swap ds_*_bytes */ SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, dsl_dataset_phys(clone)->ds_referenced_bytes); SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, dsl_dataset_phys(clone)->ds_compressed_bytes); SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, dsl_dataset_phys(clone)->ds_uncompressed_bytes); SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, dsl_dataset_phys(clone)->ds_unique_bytes); /* apply any parent delta for change in unconsumed refreservation */ dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, unused_refres_delta, 0, 0, tx); /* * Swap deadlists. */ dsl_deadlist_close(&clone->ds_deadlist); dsl_deadlist_close(&origin_head->ds_deadlist); SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, dsl_dataset_phys(clone)->ds_deadlist_obj); dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, dsl_dataset_phys(clone)->ds_deadlist_obj); dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, dsl_dataset_phys(origin_head)->ds_deadlist_obj); dsl_scan_ds_clone_swapped(origin_head, clone, tx); spa_history_log_internal_ds(clone, "clone swap", tx, "parent=%s", origin_head->ds_dir->dd_myname); } /* * 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) { dsl_pool_t *dp; dsl_dataset_t *ds; int error; error = dsl_pool_hold(pname, FTAG, &dp); if (error != 0) return (error); error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); if (error == 0) { dsl_dataset_name(ds, buf); dsl_dataset_rele(ds, FTAG); } dsl_pool_rele(dp, FTAG); return (error); } 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 > dsl_dataset_phys(ds)->ds_unique_bytes) { ASSERT3U(*used, >=, ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); *used -= (ds->ds_reserved - dsl_dataset_phys(ds)->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 (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= ds->ds_quota) { if (inflight > 0 || dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) error = SET_ERROR(ERESTART); else error = SET_ERROR(EDQUOT); } mutex_exit(&ds->ds_lock); return (error); } typedef struct dsl_dataset_set_qr_arg { const char *ddsqra_name; zprop_source_t ddsqra_source; uint64_t ddsqra_value; } dsl_dataset_set_qr_arg_t; /* ARGSUSED */ static int dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) { dsl_dataset_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; int error; uint64_t newval; if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) return (SET_ERROR(ENOTSUP)); error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); if (error != 0) return (error); if (dsl_dataset_is_snapshot(ds)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EINVAL)); } error = dsl_prop_predict(ds->ds_dir, zfs_prop_to_name(ZFS_PROP_REFQUOTA), ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } if (newval == 0) { dsl_dataset_rele(ds, FTAG); return (0); } if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || newval < ds->ds_reserved) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(ENOSPC)); } dsl_dataset_rele(ds, FTAG); return (0); } static void dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; uint64_t newval; VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFQUOTA), ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, &ddsqra->ddsqra_value, tx); VERIFY0(dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); if (ds->ds_quota != newval) { dmu_buf_will_dirty(ds->ds_dbuf, tx); ds->ds_quota = newval; } dsl_dataset_rele(ds, FTAG); } int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, uint64_t refquota) { dsl_dataset_set_qr_arg_t ddsqra; ddsqra.ddsqra_name = dsname; ddsqra.ddsqra_source = source; ddsqra.ddsqra_value = refquota; return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); } static int dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) { dsl_dataset_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; int error; uint64_t newval, unique; if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) return (SET_ERROR(ENOTSUP)); error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); if (error != 0) return (error); if (dsl_dataset_is_snapshot(ds)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EINVAL)); } error = dsl_prop_predict(ds->ds_dir, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } /* * If we are doing the preliminary check in open context, the * space estimates may be inaccurate. */ if (!dmu_tx_is_syncing(tx)) { dsl_dataset_rele(ds, FTAG); return (0); } mutex_enter(&ds->ds_lock); if (!DS_UNIQUE_IS_ACCURATE(ds)) dsl_dataset_recalc_head_uniq(ds); unique = dsl_dataset_phys(ds)->ds_unique_bytes; mutex_exit(&ds->ds_lock); if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { uint64_t delta = MAX(unique, newval) - MAX(unique, ds->ds_reserved); if (delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || (ds->ds_quota > 0 && newval > ds->ds_quota)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(ENOSPC)); } } dsl_dataset_rele(ds, FTAG); return (0); } void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, zprop_source_t source, uint64_t value, dmu_tx_t *tx) { uint64_t newval; uint64_t unique; int64_t delta; dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), source, sizeof (value), 1, &value, tx); VERIFY0(dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_dir->dd_lock); mutex_enter(&ds->ds_lock); ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); unique = dsl_dataset_phys(ds)->ds_unique_bytes; delta = MAX(0, (int64_t)(newval - unique)) - MAX(0, (int64_t)(ds->ds_reserved - unique)); ds->ds_reserved = newval; mutex_exit(&ds->ds_lock); dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); mutex_exit(&ds->ds_dir->dd_lock); } static void dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) { dsl_dataset_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); dsl_dataset_set_refreservation_sync_impl(ds, ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); dsl_dataset_rele(ds, FTAG); } int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, uint64_t refreservation) { dsl_dataset_set_qr_arg_t ddsqra; ddsqra.ddsqra_name = dsname; ddsqra.ddsqra_source = source; ddsqra.ddsqra_value = refreservation; return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, dsl_dataset_set_refreservation_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); } /* * Return (in *usedp) the amount of space written in new that is not * present in oldsnap. New may be a snapshot or the head. Old must be * a snapshot before new, in new's filesystem (or its origin). If not then * fail and return EINVAL. * * The written space is calculated by considering two components: First, we * ignore any freed space, and calculate the written as new's used space * minus old's used space. Next, we add in the amount of space that was freed * between the two snapshots, thus reducing new's used space relative to old's. * Specifically, this is the space that was born before old->ds_creation_txg, * and freed before new (ie. on new's deadlist or a previous deadlist). * * space freed [---------------------] * snapshots ---O-------O--------O-------O------ * oldsnap new */ int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) { int err = 0; uint64_t snapobj; dsl_pool_t *dp = new->ds_dir->dd_pool; ASSERT(dsl_pool_config_held(dp)); *usedp = 0; *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; *compp = 0; *compp += dsl_dataset_phys(new)->ds_compressed_bytes; *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; *uncompp = 0; *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; snapobj = new->ds_object; while (snapobj != oldsnap->ds_object) { dsl_dataset_t *snap; uint64_t used, comp, uncomp; if (snapobj == new->ds_object) { snap = new; } else { err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); if (err != 0) break; } if (dsl_dataset_phys(snap)->ds_prev_snap_txg == dsl_dataset_phys(oldsnap)->ds_creation_txg) { /* * The blocks in the deadlist can not be born after * ds_prev_snap_txg, so get the whole deadlist space, * which is more efficient (especially for old-format * deadlists). Unfortunately the deadlist code * doesn't have enough information to make this * optimization itself. */ dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); } else { dsl_deadlist_space_range(&snap->ds_deadlist, 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, &used, &comp, &uncomp); } *usedp += used; *compp += comp; *uncompp += uncomp; /* * If we get to the beginning of the chain of snapshots * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap * was not a snapshot of/before new. */ snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; if (snap != new) dsl_dataset_rele(snap, FTAG); if (snapobj == 0) { err = SET_ERROR(EINVAL); break; } } return (err); } /* * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, * lastsnap, and all snapshots in between are deleted. * * blocks that would be freed [---------------------------] * snapshots ---O-------O--------O-------O--------O * firstsnap lastsnap * * This is the set of blocks that were born after the snap before firstsnap, * (birth > firstsnap->prev_snap_txg) and died before the snap after the * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). * We calculate this by iterating over the relevant deadlists (from the snap * after lastsnap, backward to the snap after firstsnap), summing up the * space on the deadlist that was born after the snap before firstsnap. */ int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *lastsnap, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) { int err = 0; uint64_t snapobj; dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; ASSERT(dsl_dataset_is_snapshot(firstsnap)); ASSERT(dsl_dataset_is_snapshot(lastsnap)); /* * Check that the snapshots are in the same dsl_dir, and firstsnap * is before lastsnap. */ if (firstsnap->ds_dir != lastsnap->ds_dir || dsl_dataset_phys(firstsnap)->ds_creation_txg > dsl_dataset_phys(lastsnap)->ds_creation_txg) return (SET_ERROR(EINVAL)); *usedp = *compp = *uncompp = 0; snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; while (snapobj != firstsnap->ds_object) { dsl_dataset_t *ds; uint64_t used, comp, uncomp; err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); if (err != 0) break; dsl_deadlist_space_range(&ds->ds_deadlist, dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, &used, &comp, &uncomp); *usedp += used; *compp += comp; *uncompp += uncomp; snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; ASSERT3U(snapobj, !=, 0); dsl_dataset_rele(ds, FTAG); } return (err); } static int dsl_dataset_activate_large_blocks_check(void *arg, dmu_tx_t *tx) { const char *dsname = arg; dsl_dataset_t *ds; dsl_pool_t *dp = dmu_tx_pool(tx); int error = 0; if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) return (SET_ERROR(ENOTSUP)); ASSERT(spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EXTENSIBLE_DATASET)); error = dsl_dataset_hold(dp, dsname, FTAG, &ds); if (error != 0) return (error); if (ds->ds_large_blocks) error = EALREADY; dsl_dataset_rele(ds, FTAG); return (error); } void dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx) { spa_t *spa = dmu_tx_pool(tx)->dp_spa; objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; uint64_t zero = 0; spa_feature_incr(spa, SPA_FEATURE_LARGE_BLOCKS, tx); dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); VERIFY0(zap_add(mos, dsobj, DS_FIELD_LARGE_BLOCKS, sizeof (zero), 1, &zero, tx)); } static void dsl_dataset_activate_large_blocks_sync(void *arg, dmu_tx_t *tx) { const char *dsname = arg; dsl_dataset_t *ds; VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx), dsname, FTAG, &ds)); dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); ASSERT(!ds->ds_large_blocks); ds->ds_large_blocks = B_TRUE; dsl_dataset_rele(ds, FTAG); } int dsl_dataset_activate_large_blocks(const char *dsname) { int error; error = dsl_sync_task(dsname, dsl_dataset_activate_large_blocks_check, dsl_dataset_activate_large_blocks_sync, (void *)dsname, 1, ZFS_SPACE_CHECK_RESERVED); /* * EALREADY indicates that this dataset already supports large blocks. */ if (error == EALREADY) error = 0; return (error); } /* * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. * For example, they could both be snapshots of the same filesystem, and * 'earlier' is before 'later'. Or 'earlier' could be the origin of * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's * filesystem. Or 'earlier' could be the origin's origin. * * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. */ boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, uint64_t earlier_txg) { dsl_pool_t *dp = later->ds_dir->dd_pool; int error; boolean_t ret; ASSERT(dsl_pool_config_held(dp)); ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0); if (earlier_txg == 0) earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; if (dsl_dataset_is_snapshot(later) && earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) return (B_FALSE); if (later->ds_dir == earlier->ds_dir) return (B_TRUE); if (!dsl_dir_is_clone(later->ds_dir)) return (B_FALSE); if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) return (B_TRUE); dsl_dataset_t *origin; error = dsl_dataset_hold_obj(dp, dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); if (error != 0) return (B_FALSE); ret = dsl_dataset_is_before(origin, earlier, earlier_txg); dsl_dataset_rele(origin, FTAG); return (ret); } void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) { objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); } Index: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c =================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c (revision 278141) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c (revision 278142) @@ -1,1982 +1,1983 @@ /* * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2011 Pawel Jakub Dawidek . * All rights reserved. * Copyright (c) 2012, 2014 by Delphix. All rights reserved. * Copyright (c) 2014 Joyent, Inc. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef _KERNEL #include #endif #include #include #include #include "zfs_namecheck.h" #include "zfs_prop.h" /* * Filesystem and Snapshot Limits * ------------------------------ * * These limits are used to restrict the number of filesystems and/or snapshots * that can be created at a given level in the tree or below. A typical * use-case is with a delegated dataset where the administrator wants to ensure * that a user within the zone is not creating too many additional filesystems * or snapshots, even though they're not exceeding their space quota. * * The filesystem and snapshot counts are stored as extensible properties. This * capability is controlled by a feature flag and must be enabled to be used. * Once enabled, the feature is not active until the first limit is set. At * that point, future operations to create/destroy filesystems or snapshots * will validate and update the counts. * * Because the count properties will not exist before the feature is active, * the counts are updated when a limit is first set on an uninitialized * dsl_dir node in the tree (The filesystem/snapshot count on a node includes * all of the nested filesystems/snapshots. Thus, a new leaf node has a * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and * snapshot count properties on a node indicate uninitialized counts on that * node.) When first setting a limit on an uninitialized node, the code starts * at the filesystem with the new limit and descends into all sub-filesystems * to add the count properties. * * In practice this is lightweight since a limit is typically set when the * filesystem is created and thus has no children. Once valid, changing the * limit value won't require a re-traversal since the counts are already valid. * When recursively fixing the counts, if a node with a limit is encountered * during the descent, the counts are known to be valid and there is no need to * descend into that filesystem's children. The counts on filesystems above the * one with the new limit will still be uninitialized, unless a limit is * eventually set on one of those filesystems. The counts are always recursively * updated when a limit is set on a dataset, unless there is already a limit. * When a new limit value is set on a filesystem with an existing limit, it is * possible for the new limit to be less than the current count at that level * since a user who can change the limit is also allowed to exceed the limit. * * Once the feature is active, then whenever a filesystem or snapshot is * created, the code recurses up the tree, validating the new count against the * limit at each initialized level. In practice, most levels will not have a * limit set. If there is a limit at any initialized level up the tree, the * check must pass or the creation will fail. Likewise, when a filesystem or * snapshot is destroyed, the counts are recursively adjusted all the way up * the initizized nodes in the tree. Renaming a filesystem into different point * in the tree will first validate, then update the counts on each branch up to * the common ancestor. A receive will also validate the counts and then update * them. * * An exception to the above behavior is that the limit is not enforced if the * user has permission to modify the limit. This is primarily so that * recursive snapshots in the global zone always work. We want to prevent a * denial-of-service in which a lower level delegated dataset could max out its * limit and thus block recursive snapshots from being taken in the global zone. * Because of this, it is possible for the snapshot count to be over the limit * and snapshots taken in the global zone could cause a lower level dataset to * hit or exceed its limit. The administrator taking the global zone recursive * snapshot should be aware of this side-effect and behave accordingly. * For consistency, the filesystem limit is also not enforced if the user can * modify the limit. * * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check() * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by * dsl_dir_init_fs_ss_count(). * * There is a special case when we receive a filesystem that already exists. In * this case a temporary clone name of %X is created (see dmu_recv_begin). We * never update the filesystem counts for temporary clones. * * Likewise, we do not update the snapshot counts for temporary snapshots, * such as those created by zfs diff. */ extern inline dsl_dir_phys_t *dsl_dir_phys(dsl_dir_t *dd); static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd); /* ARGSUSED */ static void dsl_dir_evict(dmu_buf_t *db, void *arg) { dsl_dir_t *dd = arg; dsl_pool_t *dp = dd->dd_pool; int t; for (t = 0; t < TXG_SIZE; t++) { ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t)); ASSERT(dd->dd_tempreserved[t] == 0); ASSERT(dd->dd_space_towrite[t] == 0); } if (dd->dd_parent) dsl_dir_rele(dd->dd_parent, dd); spa_close(dd->dd_pool->dp_spa, dd); /* * The props callback list should have been cleaned up by * objset_evict(). */ list_destroy(&dd->dd_prop_cbs); mutex_destroy(&dd->dd_lock); kmem_free(dd, sizeof (dsl_dir_t)); } int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj, const char *tail, void *tag, dsl_dir_t **ddp) { dmu_buf_t *dbuf; dsl_dir_t *dd; int err; ASSERT(dsl_pool_config_held(dp)); err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf); if (err != 0) return (err); dd = dmu_buf_get_user(dbuf); #ifdef ZFS_DEBUG { dmu_object_info_t doi; dmu_object_info_from_db(dbuf, &doi); ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR); ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t)); } #endif if (dd == NULL) { dsl_dir_t *winner; dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP); dd->dd_object = ddobj; dd->dd_dbuf = dbuf; dd->dd_pool = dp; mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL); list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t), offsetof(dsl_prop_cb_record_t, cbr_node)); dsl_dir_snap_cmtime_update(dd); if (dsl_dir_phys(dd)->dd_parent_obj) { err = dsl_dir_hold_obj(dp, dsl_dir_phys(dd)->dd_parent_obj, NULL, dd, &dd->dd_parent); if (err != 0) goto errout; if (tail) { #ifdef ZFS_DEBUG uint64_t foundobj; err = zap_lookup(dp->dp_meta_objset, dsl_dir_phys(dd->dd_parent)-> dd_child_dir_zapobj, tail, sizeof (foundobj), 1, &foundobj); ASSERT(err || foundobj == ddobj); #endif (void) strcpy(dd->dd_myname, tail); } else { err = zap_value_search(dp->dp_meta_objset, dsl_dir_phys(dd->dd_parent)-> dd_child_dir_zapobj, ddobj, 0, dd->dd_myname); } if (err != 0) goto errout; } else { (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa)); } if (dsl_dir_is_clone(dd)) { dmu_buf_t *origin_bonus; dsl_dataset_phys_t *origin_phys; /* * We can't open the origin dataset, because * that would require opening this dsl_dir. * Just look at its phys directly instead. */ err = dmu_bonus_hold(dp->dp_meta_objset, dsl_dir_phys(dd)->dd_origin_obj, FTAG, &origin_bonus); if (err != 0) goto errout; origin_phys = origin_bonus->db_data; dd->dd_origin_txg = origin_phys->ds_creation_txg; dmu_buf_rele(origin_bonus, FTAG); } winner = dmu_buf_set_user_ie(dbuf, dd, dsl_dir_evict); if (winner) { if (dd->dd_parent) dsl_dir_rele(dd->dd_parent, dd); mutex_destroy(&dd->dd_lock); kmem_free(dd, sizeof (dsl_dir_t)); dd = winner; } else { spa_open_ref(dp->dp_spa, dd); } } /* * The dsl_dir_t has both open-to-close and instantiate-to-evict * holds on the spa. We need the open-to-close holds because * otherwise the spa_refcnt wouldn't change when we open a * dir which the spa also has open, so we could incorrectly * think it was OK to unload/export/destroy the pool. We need * the instantiate-to-evict hold because the dsl_dir_t has a * pointer to the dd_pool, which has a pointer to the spa_t. */ spa_open_ref(dp->dp_spa, tag); ASSERT3P(dd->dd_pool, ==, dp); ASSERT3U(dd->dd_object, ==, ddobj); ASSERT3P(dd->dd_dbuf, ==, dbuf); *ddp = dd; return (0); errout: if (dd->dd_parent) dsl_dir_rele(dd->dd_parent, dd); mutex_destroy(&dd->dd_lock); kmem_free(dd, sizeof (dsl_dir_t)); dmu_buf_rele(dbuf, tag); return (err); } void dsl_dir_rele(dsl_dir_t *dd, void *tag) { dprintf_dd(dd, "%s\n", ""); spa_close(dd->dd_pool->dp_spa, tag); dmu_buf_rele(dd->dd_dbuf, tag); } /* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */ void dsl_dir_name(dsl_dir_t *dd, char *buf) { if (dd->dd_parent) { dsl_dir_name(dd->dd_parent, buf); (void) strcat(buf, "/"); } else { buf[0] = '\0'; } if (!MUTEX_HELD(&dd->dd_lock)) { /* * recursive mutex so that we can use * dprintf_dd() with dd_lock held */ mutex_enter(&dd->dd_lock); (void) strcat(buf, dd->dd_myname); mutex_exit(&dd->dd_lock); } else { (void) strcat(buf, dd->dd_myname); } } /* Calculate name length, avoiding all the strcat calls of dsl_dir_name */ int dsl_dir_namelen(dsl_dir_t *dd) { int result = 0; if (dd->dd_parent) { /* parent's name + 1 for the "/" */ result = dsl_dir_namelen(dd->dd_parent) + 1; } if (!MUTEX_HELD(&dd->dd_lock)) { /* see dsl_dir_name */ mutex_enter(&dd->dd_lock); result += strlen(dd->dd_myname); mutex_exit(&dd->dd_lock); } else { result += strlen(dd->dd_myname); } return (result); } static int getcomponent(const char *path, char *component, const char **nextp) { char *p; if ((path == NULL) || (path[0] == '\0')) return (SET_ERROR(ENOENT)); /* This would be a good place to reserve some namespace... */ p = strpbrk(path, "/@"); if (p && (p[1] == '/' || p[1] == '@')) { /* two separators in a row */ return (SET_ERROR(EINVAL)); } if (p == NULL || p == path) { /* * if the first thing is an @ or /, it had better be an * @ and it had better not have any more ats or slashes, * and it had better have something after the @. */ if (p != NULL && (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0')) return (SET_ERROR(EINVAL)); if (strlen(path) >= MAXNAMELEN) return (SET_ERROR(ENAMETOOLONG)); (void) strcpy(component, path); p = NULL; } else if (p[0] == '/') { if (p - path >= MAXNAMELEN) return (SET_ERROR(ENAMETOOLONG)); (void) strncpy(component, path, p - path); component[p - path] = '\0'; p++; } else if (p[0] == '@') { /* * if the next separator is an @, there better not be * any more slashes. */ if (strchr(path, '/')) return (SET_ERROR(EINVAL)); if (p - path >= MAXNAMELEN) return (SET_ERROR(ENAMETOOLONG)); (void) strncpy(component, path, p - path); component[p - path] = '\0'; } else { panic("invalid p=%p", (void *)p); } *nextp = p; return (0); } /* * Return the dsl_dir_t, and possibly the last component which couldn't * be found in *tail. The name must be in the specified dsl_pool_t. This * thread must hold the dp_config_rwlock for the pool. Returns NULL if the * path is bogus, or if tail==NULL and we couldn't parse the whole name. * (*tail)[0] == '@' means that the last component is a snapshot. */ int dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag, dsl_dir_t **ddp, const char **tailp) { char buf[MAXNAMELEN]; const char *spaname, *next, *nextnext = NULL; int err; dsl_dir_t *dd; uint64_t ddobj; err = getcomponent(name, buf, &next); if (err != 0) return (err); /* Make sure the name is in the specified pool. */ spaname = spa_name(dp->dp_spa); if (strcmp(buf, spaname) != 0) return (SET_ERROR(EINVAL)); ASSERT(dsl_pool_config_held(dp)); err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd); if (err != 0) { return (err); } while (next != NULL) { dsl_dir_t *child_ds; err = getcomponent(next, buf, &nextnext); if (err != 0) break; ASSERT(next[0] != '\0'); if (next[0] == '@') break; dprintf("looking up %s in obj%lld\n", buf, dsl_dir_phys(dd)->dd_child_dir_zapobj); err = zap_lookup(dp->dp_meta_objset, dsl_dir_phys(dd)->dd_child_dir_zapobj, buf, sizeof (ddobj), 1, &ddobj); if (err != 0) { if (err == ENOENT) err = 0; break; } err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_ds); if (err != 0) break; dsl_dir_rele(dd, tag); dd = child_ds; next = nextnext; } if (err != 0) { dsl_dir_rele(dd, tag); return (err); } /* * It's an error if there's more than one component left, or * tailp==NULL and there's any component left. */ if (next != NULL && (tailp == NULL || (nextnext && nextnext[0] != '\0'))) { /* bad path name */ dsl_dir_rele(dd, tag); dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp); err = SET_ERROR(ENOENT); } if (tailp != NULL) *tailp = next; *ddp = dd; return (err); } /* * If the counts are already initialized for this filesystem and its * descendants then do nothing, otherwise initialize the counts. * * The counts on this filesystem, and those below, may be uninitialized due to * either the use of a pre-existing pool which did not support the * filesystem/snapshot limit feature, or one in which the feature had not yet * been enabled. * * Recursively descend the filesystem tree and update the filesystem/snapshot * counts on each filesystem below, then update the cumulative count on the * current filesystem. If the filesystem already has a count set on it, * then we know that its counts, and the counts on the filesystems below it, * are already correct, so we don't have to update this filesystem. */ static void dsl_dir_init_fs_ss_count(dsl_dir_t *dd, dmu_tx_t *tx) { uint64_t my_fs_cnt = 0; uint64_t my_ss_cnt = 0; dsl_pool_t *dp = dd->dd_pool; objset_t *os = dp->dp_meta_objset; zap_cursor_t *zc; zap_attribute_t *za; dsl_dataset_t *ds; ASSERT(spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)); ASSERT(dsl_pool_config_held(dp)); ASSERT(dmu_tx_is_syncing(tx)); dsl_dir_zapify(dd, tx); /* * If the filesystem count has already been initialized then we * don't need to recurse down any further. */ if (zap_contains(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0) return; zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP); za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); /* Iterate my child dirs */ for (zap_cursor_init(zc, os, dsl_dir_phys(dd)->dd_child_dir_zapobj); zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) { dsl_dir_t *chld_dd; uint64_t count; VERIFY0(dsl_dir_hold_obj(dp, za->za_first_integer, NULL, FTAG, &chld_dd)); /* * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and * temporary datasets. */ if (chld_dd->dd_myname[0] == '$' || chld_dd->dd_myname[0] == '%') { dsl_dir_rele(chld_dd, FTAG); continue; } my_fs_cnt++; /* count this child */ dsl_dir_init_fs_ss_count(chld_dd, tx); VERIFY0(zap_lookup(os, chld_dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count)); my_fs_cnt += count; VERIFY0(zap_lookup(os, chld_dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count)); my_ss_cnt += count; dsl_dir_rele(chld_dd, FTAG); } zap_cursor_fini(zc); /* Count my snapshots (we counted children's snapshots above) */ VERIFY0(dsl_dataset_hold_obj(dd->dd_pool, dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds)); for (zap_cursor_init(zc, os, dsl_dataset_phys(ds)->ds_snapnames_zapobj); zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) { /* Don't count temporary snapshots */ if (za->za_name[0] != '%') my_ss_cnt++; } zap_cursor_fini(zc); dsl_dataset_rele(ds, FTAG); kmem_free(zc, sizeof (zap_cursor_t)); kmem_free(za, sizeof (zap_attribute_t)); /* we're in a sync task, update counts */ dmu_buf_will_dirty(dd->dd_dbuf, tx); VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (my_fs_cnt), 1, &my_fs_cnt, tx)); VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (my_ss_cnt), 1, &my_ss_cnt, tx)); } static int dsl_dir_actv_fs_ss_limit_check(void *arg, dmu_tx_t *tx) { char *ddname = (char *)arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; dsl_dir_t *dd; int error; error = dsl_dataset_hold(dp, ddname, FTAG, &ds); if (error != 0) return (error); if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(ENOTSUP)); } dd = ds->ds_dir; if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT) && dsl_dir_is_zapified(dd) && zap_contains(dp->dp_meta_objset, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0) { dsl_dataset_rele(ds, FTAG); return (SET_ERROR(EALREADY)); } dsl_dataset_rele(ds, FTAG); return (0); } static void dsl_dir_actv_fs_ss_limit_sync(void *arg, dmu_tx_t *tx) { char *ddname = (char *)arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; spa_t *spa; VERIFY0(dsl_dataset_hold(dp, ddname, FTAG, &ds)); spa = dsl_dataset_get_spa(ds); if (!spa_feature_is_active(spa, SPA_FEATURE_FS_SS_LIMIT)) { /* * Since the feature was not active and we're now setting a * limit, increment the feature-active counter so that the * feature becomes active for the first time. * * We are already in a sync task so we can update the MOS. */ spa_feature_incr(spa, SPA_FEATURE_FS_SS_LIMIT, tx); } /* * Since we are now setting a non-UINT64_MAX limit on the filesystem, * we need to ensure the counts are correct. Descend down the tree from * this point and update all of the counts to be accurate. */ dsl_dir_init_fs_ss_count(ds->ds_dir, tx); dsl_dataset_rele(ds, FTAG); } /* * Make sure the feature is enabled and activate it if necessary. * Since we're setting a limit, ensure the on-disk counts are valid. * This is only called by the ioctl path when setting a limit value. * * We do not need to validate the new limit, since users who can change the * limit are also allowed to exceed the limit. */ int dsl_dir_activate_fs_ss_limit(const char *ddname) { int error; error = dsl_sync_task(ddname, dsl_dir_actv_fs_ss_limit_check, dsl_dir_actv_fs_ss_limit_sync, (void *)ddname, 0, ZFS_SPACE_CHECK_RESERVED); if (error == EALREADY) error = 0; return (error); } /* * Used to determine if the filesystem_limit or snapshot_limit should be * enforced. We allow the limit to be exceeded if the user has permission to * write the property value. We pass in the creds that we got in the open * context since we will always be the GZ root in syncing context. We also have * to handle the case where we are allowed to change the limit on the current * dataset, but there may be another limit in the tree above. * * We can never modify these two properties within a non-global zone. In * addition, the other checks are modeled on zfs_secpolicy_write_perms. We * can't use that function since we are already holding the dp_config_rwlock. * In addition, we already have the dd and dealing with snapshots is simplified * in this code. */ typedef enum { ENFORCE_ALWAYS, ENFORCE_NEVER, ENFORCE_ABOVE } enforce_res_t; static enforce_res_t dsl_enforce_ds_ss_limits(dsl_dir_t *dd, zfs_prop_t prop, cred_t *cr) { enforce_res_t enforce = ENFORCE_ALWAYS; uint64_t obj; dsl_dataset_t *ds; uint64_t zoned; ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT || prop == ZFS_PROP_SNAPSHOT_LIMIT); #ifdef _KERNEL #ifdef __FreeBSD__ if (jailed(cr)) #else if (crgetzoneid(cr) != GLOBAL_ZONEID) #endif return (ENFORCE_ALWAYS); if (secpolicy_zfs(cr) == 0) return (ENFORCE_NEVER); #endif if ((obj = dsl_dir_phys(dd)->dd_head_dataset_obj) == 0) return (ENFORCE_ALWAYS); ASSERT(dsl_pool_config_held(dd->dd_pool)); if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0) return (ENFORCE_ALWAYS); if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL) || zoned) { /* Only root can access zoned fs's from the GZ */ enforce = ENFORCE_ALWAYS; } else { if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0) enforce = ENFORCE_ABOVE; } dsl_dataset_rele(ds, FTAG); return (enforce); } /* * Check if adding additional child filesystem(s) would exceed any filesystem * limits or adding additional snapshot(s) would exceed any snapshot limits. * The prop argument indicates which limit to check. * * Note that all filesystem limits up to the root (or the highest * initialized) filesystem or the given ancestor must be satisfied. */ int dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop, dsl_dir_t *ancestor, cred_t *cr) { objset_t *os = dd->dd_pool->dp_meta_objset; uint64_t limit, count; char *count_prop; enforce_res_t enforce; int err = 0; ASSERT(dsl_pool_config_held(dd->dd_pool)); ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT || prop == ZFS_PROP_SNAPSHOT_LIMIT); /* * If we're allowed to change the limit, don't enforce the limit * e.g. this can happen if a snapshot is taken by an administrative * user in the global zone (i.e. a recursive snapshot by root). * However, we must handle the case of delegated permissions where we * are allowed to change the limit on the current dataset, but there * is another limit in the tree above. */ enforce = dsl_enforce_ds_ss_limits(dd, prop, cr); if (enforce == ENFORCE_NEVER) return (0); /* * e.g. if renaming a dataset with no snapshots, count adjustment * is 0. */ if (delta == 0) return (0); if (prop == ZFS_PROP_SNAPSHOT_LIMIT) { /* * We don't enforce the limit for temporary snapshots. This is * indicated by a NULL cred_t argument. */ if (cr == NULL) return (0); count_prop = DD_FIELD_SNAPSHOT_COUNT; } else { count_prop = DD_FIELD_FILESYSTEM_COUNT; } /* * If an ancestor has been provided, stop checking the limit once we * hit that dir. We need this during rename so that we don't overcount * the check once we recurse up to the common ancestor. */ if (ancestor == dd) return (0); /* * If we hit an uninitialized node while recursing up the tree, we can * stop since we know there is no limit here (or above). The counts are * not valid on this node and we know we won't touch this node's counts. */ if (!dsl_dir_is_zapified(dd) || zap_lookup(os, dd->dd_object, count_prop, sizeof (count), 1, &count) == ENOENT) return (0); err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL, B_FALSE); if (err != 0) return (err); /* Is there a limit which we've hit? */ if (enforce == ENFORCE_ALWAYS && (count + delta) > limit) return (SET_ERROR(EDQUOT)); if (dd->dd_parent != NULL) err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop, ancestor, cr); return (err); } /* * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all * parents. When a new filesystem/snapshot is created, increment the count on * all parents, and when a filesystem/snapshot is destroyed, decrement the * count. */ void dsl_fs_ss_count_adjust(dsl_dir_t *dd, int64_t delta, const char *prop, dmu_tx_t *tx) { int err; objset_t *os = dd->dd_pool->dp_meta_objset; uint64_t count; ASSERT(dsl_pool_config_held(dd->dd_pool)); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 || strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0); /* * When we receive an incremental stream into a filesystem that already * exists, a temporary clone is created. We don't count this temporary * clone, whose name begins with a '%'. We also ignore hidden ($FREE, * $MOS & $ORIGIN) objsets. */ if ((dd->dd_myname[0] == '%' || dd->dd_myname[0] == '$') && strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0) return; /* * e.g. if renaming a dataset with no snapshots, count adjustment is 0 */ if (delta == 0) return; /* * If we hit an uninitialized node while recursing up the tree, we can * stop since we know the counts are not valid on this node and we * know we shouldn't touch this node's counts. An uninitialized count * on the node indicates that either the feature has not yet been * activated or there are no limits on this part of the tree. */ if (!dsl_dir_is_zapified(dd) || (err = zap_lookup(os, dd->dd_object, prop, sizeof (count), 1, &count)) == ENOENT) return; VERIFY0(err); count += delta; /* Use a signed verify to make sure we're not neg. */ VERIFY3S(count, >=, 0); VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count, tx)); /* Roll up this additional count into our ancestors */ if (dd->dd_parent != NULL) dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx); } uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name, dmu_tx_t *tx) { objset_t *mos = dp->dp_meta_objset; uint64_t ddobj; dsl_dir_phys_t *ddphys; dmu_buf_t *dbuf; ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0, DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx); if (pds) { VERIFY(0 == zap_add(mos, dsl_dir_phys(pds)->dd_child_dir_zapobj, name, sizeof (uint64_t), 1, &ddobj, tx)); } else { /* it's the root dir */ VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx)); } VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf)); dmu_buf_will_dirty(dbuf, tx); ddphys = dbuf->db_data; ddphys->dd_creation_time = gethrestime_sec(); if (pds) { ddphys->dd_parent_obj = pds->dd_object; /* update the filesystem counts */ dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx); } ddphys->dd_props_zapobj = zap_create(mos, DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx); ddphys->dd_child_dir_zapobj = zap_create(mos, DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx); if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN) ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN; dmu_buf_rele(dbuf, FTAG); return (ddobj); } boolean_t dsl_dir_is_clone(dsl_dir_t *dd) { return (dsl_dir_phys(dd)->dd_origin_obj && (dd->dd_pool->dp_origin_snap == NULL || dsl_dir_phys(dd)->dd_origin_obj != dd->dd_pool->dp_origin_snap->ds_object)); } void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv) { mutex_enter(&dd->dd_lock); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, dsl_dir_phys(dd)->dd_used_bytes); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dsl_dir_phys(dd)->dd_quota); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION, dsl_dir_phys(dd)->dd_reserved); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, dsl_dir_phys(dd)->dd_compressed_bytes == 0 ? 100 : (dsl_dir_phys(dd)->dd_uncompressed_bytes * 100 / dsl_dir_phys(dd)->dd_compressed_bytes)); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED, dsl_dir_phys(dd)->dd_uncompressed_bytes); if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) { dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP, dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS, dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_HEAD]); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV, dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_REFRSRV]); dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD, dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD] + dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD_RSRV]); } mutex_exit(&dd->dd_lock); if (dsl_dir_is_zapified(dd)) { uint64_t count; objset_t *os = dd->dd_pool->dp_meta_objset; if (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count) == 0) { dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_FILESYSTEM_COUNT, count); } if (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count) == 0) { dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOT_COUNT, count); } } if (dsl_dir_is_clone(dd)) { dsl_dataset_t *ds; char buf[MAXNAMELEN]; VERIFY0(dsl_dataset_hold_obj(dd->dd_pool, dsl_dir_phys(dd)->dd_origin_obj, FTAG, &ds)); dsl_dataset_name(ds, buf); dsl_dataset_rele(ds, FTAG); dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf); } } void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx) { dsl_pool_t *dp = dd->dd_pool; ASSERT(dsl_dir_phys(dd)); if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) { /* up the hold count until we can be written out */ dmu_buf_add_ref(dd->dd_dbuf, dd); } } static int64_t parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta) { uint64_t old_accounted = MAX(used, dsl_dir_phys(dd)->dd_reserved); uint64_t new_accounted = MAX(used + delta, dsl_dir_phys(dd)->dd_reserved); return (new_accounted - old_accounted); } void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx) { ASSERT(dmu_tx_is_syncing(tx)); mutex_enter(&dd->dd_lock); ASSERT0(dd->dd_tempreserved[tx->tx_txg&TXG_MASK]); dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg, dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024); dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0; mutex_exit(&dd->dd_lock); /* release the hold from dsl_dir_dirty */ dmu_buf_rele(dd->dd_dbuf, dd); } static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd) { uint64_t space = 0; int i; ASSERT(MUTEX_HELD(&dd->dd_lock)); for (i = 0; i < TXG_SIZE; i++) { space += dd->dd_space_towrite[i&TXG_MASK]; ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0); } return (space); } /* * How much space would dd have available if ancestor had delta applied * to it? If ondiskonly is set, we're only interested in what's * on-disk, not estimated pending changes. */ uint64_t dsl_dir_space_available(dsl_dir_t *dd, dsl_dir_t *ancestor, int64_t delta, int ondiskonly) { uint64_t parentspace, myspace, quota, used; /* * If there are no restrictions otherwise, assume we have * unlimited space available. */ quota = UINT64_MAX; parentspace = UINT64_MAX; if (dd->dd_parent != NULL) { parentspace = dsl_dir_space_available(dd->dd_parent, ancestor, delta, ondiskonly); } mutex_enter(&dd->dd_lock); if (dsl_dir_phys(dd)->dd_quota != 0) quota = dsl_dir_phys(dd)->dd_quota; used = dsl_dir_phys(dd)->dd_used_bytes; if (!ondiskonly) used += dsl_dir_space_towrite(dd); if (dd->dd_parent == NULL) { uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE); quota = MIN(quota, poolsize); } if (dsl_dir_phys(dd)->dd_reserved > used && parentspace != UINT64_MAX) { /* * We have some space reserved, in addition to what our * parent gave us. */ parentspace += dsl_dir_phys(dd)->dd_reserved - used; } if (dd == ancestor) { ASSERT(delta <= 0); ASSERT(used >= -delta); used += delta; if (parentspace != UINT64_MAX) parentspace -= delta; } if (used > quota) { /* over quota */ myspace = 0; } else { /* * the lesser of the space provided by our parent and * the space left in our quota */ myspace = MIN(parentspace, quota - used); } mutex_exit(&dd->dd_lock); return (myspace); } struct tempreserve { list_node_t tr_node; dsl_dir_t *tr_ds; uint64_t tr_size; }; static int dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree, boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list, dmu_tx_t *tx, boolean_t first) { uint64_t txg = tx->tx_txg; uint64_t est_inflight, used_on_disk, quota, parent_rsrv; uint64_t deferred = 0; struct tempreserve *tr; int retval = EDQUOT; int txgidx = txg & TXG_MASK; int i; uint64_t ref_rsrv = 0; ASSERT3U(txg, !=, 0); ASSERT3S(asize, >, 0); mutex_enter(&dd->dd_lock); /* * Check against the dsl_dir's quota. We don't add in the delta * when checking for over-quota because they get one free hit. */ est_inflight = dsl_dir_space_towrite(dd); for (i = 0; i < TXG_SIZE; i++) est_inflight += dd->dd_tempreserved[i]; used_on_disk = dsl_dir_phys(dd)->dd_used_bytes; /* * On the first iteration, fetch the dataset's used-on-disk and * refreservation values. Also, if checkrefquota is set, test if * allocating this space would exceed the dataset's refquota. */ if (first && tx->tx_objset) { int error; dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset; error = dsl_dataset_check_quota(ds, checkrefquota, asize, est_inflight, &used_on_disk, &ref_rsrv); if (error) { mutex_exit(&dd->dd_lock); return (error); } } /* * If this transaction will result in a net free of space, * we want to let it through. */ if (ignorequota || netfree || dsl_dir_phys(dd)->dd_quota == 0) quota = UINT64_MAX; else quota = dsl_dir_phys(dd)->dd_quota; /* * Adjust the quota against the actual pool size at the root * minus any outstanding deferred frees. * To ensure that it's possible to remove files from a full * pool without inducing transient overcommits, we throttle * netfree transactions against a quota that is slightly larger, * but still within the pool's allocation slop. In cases where * we're very close to full, this will allow a steady trickle of * removes to get through. */ if (dd->dd_parent == NULL) { spa_t *spa = dd->dd_pool->dp_spa; uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree); deferred = metaslab_class_get_deferred(spa_normal_class(spa)); if (poolsize - deferred < quota) { quota = poolsize - deferred; retval = ENOSPC; } } /* * 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 (used_on_disk + est_inflight >= quota) { if (est_inflight > 0 || used_on_disk < quota || (retval == ENOSPC && used_on_disk < quota + deferred)) retval = ERESTART; dprintf_dd(dd, "failing: used=%lluK inflight = %lluK " "quota=%lluK tr=%lluK err=%d\n", used_on_disk>>10, est_inflight>>10, quota>>10, asize>>10, retval); mutex_exit(&dd->dd_lock); return (SET_ERROR(retval)); } /* We need to up our estimated delta before dropping dd_lock */ dd->dd_tempreserved[txgidx] += asize; parent_rsrv = parent_delta(dd, used_on_disk + est_inflight, asize - ref_rsrv); mutex_exit(&dd->dd_lock); tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); tr->tr_ds = dd; tr->tr_size = asize; list_insert_tail(tr_list, tr); /* see if it's OK with our parent */ if (dd->dd_parent && parent_rsrv) { boolean_t ismos = (dsl_dir_phys(dd)->dd_head_dataset_obj == 0); return (dsl_dir_tempreserve_impl(dd->dd_parent, parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE)); } else { return (0); } } /* * Reserve space in this dsl_dir, to be used in this tx's txg. * After the space has been dirtied (and dsl_dir_willuse_space() * has been called), the reservation should be canceled, using * dsl_dir_tempreserve_clear(). */ int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize, uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx) { int err; list_t *tr_list; if (asize == 0) { *tr_cookiep = NULL; return (0); } tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP); list_create(tr_list, sizeof (struct tempreserve), offsetof(struct tempreserve, tr_node)); ASSERT3S(asize, >, 0); ASSERT3S(fsize, >=, 0); err = arc_tempreserve_space(lsize, tx->tx_txg); if (err == 0) { struct tempreserve *tr; tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); tr->tr_size = lsize; list_insert_tail(tr_list, tr); } else { if (err == EAGAIN) { /* * If arc_memory_throttle() detected that pageout * is running and we are low on memory, we delay new * non-pageout transactions to give pageout an * advantage. * * It is unfortunate to be delaying while the caller's * locks are held. */ txg_delay(dd->dd_pool, tx->tx_txg, MSEC2NSEC(10), MSEC2NSEC(10)); err = SET_ERROR(ERESTART); } } if (err == 0) { err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize, FALSE, asize > usize, tr_list, tx, TRUE); } if (err != 0) dsl_dir_tempreserve_clear(tr_list, tx); else *tr_cookiep = tr_list; return (err); } /* * Clear a temporary reservation that we previously made with * dsl_dir_tempreserve_space(). */ void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx) { int txgidx = tx->tx_txg & TXG_MASK; list_t *tr_list = tr_cookie; struct tempreserve *tr; ASSERT3U(tx->tx_txg, !=, 0); if (tr_cookie == NULL) return; while ((tr = list_head(tr_list)) != NULL) { if (tr->tr_ds) { mutex_enter(&tr->tr_ds->dd_lock); ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=, tr->tr_size); tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size; mutex_exit(&tr->tr_ds->dd_lock); } else { arc_tempreserve_clear(tr->tr_size); } list_remove(tr_list, tr); kmem_free(tr, sizeof (struct tempreserve)); } kmem_free(tr_list, sizeof (list_t)); } /* * This should be called from open context when we think we're going to write * or free space, for example when dirtying data. Be conservative; it's okay * to write less space or free more, but we don't want to write more or free * less than the amount specified. */ void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx) { int64_t parent_space; uint64_t est_used; mutex_enter(&dd->dd_lock); if (space > 0) dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space; est_used = dsl_dir_space_towrite(dd) + dsl_dir_phys(dd)->dd_used_bytes; parent_space = parent_delta(dd, est_used, space); mutex_exit(&dd->dd_lock); /* Make sure that we clean up dd_space_to* */ dsl_dir_dirty(dd, tx); /* XXX this is potentially expensive and unnecessary... */ if (parent_space && dd->dd_parent) dsl_dir_willuse_space(dd->dd_parent, parent_space, tx); } /* call from syncing context when we actually write/free space for this dd */ void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type, int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx) { int64_t accounted_delta; /* * dsl_dataset_set_refreservation_sync_impl() calls this with * dd_lock held, so that it can atomically update * ds->ds_reserved and the dsl_dir accounting, so that * dsl_dataset_check_quota() can see dataset and dir accounting * consistently. */ boolean_t needlock = !MUTEX_HELD(&dd->dd_lock); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(type < DD_USED_NUM); dmu_buf_will_dirty(dd->dd_dbuf, tx); if (needlock) mutex_enter(&dd->dd_lock); accounted_delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, used); ASSERT(used >= 0 || dsl_dir_phys(dd)->dd_used_bytes >= -used); ASSERT(compressed >= 0 || dsl_dir_phys(dd)->dd_compressed_bytes >= -compressed); ASSERT(uncompressed >= 0 || dsl_dir_phys(dd)->dd_uncompressed_bytes >= -uncompressed); dsl_dir_phys(dd)->dd_used_bytes += used; dsl_dir_phys(dd)->dd_uncompressed_bytes += uncompressed; dsl_dir_phys(dd)->dd_compressed_bytes += compressed; if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) { ASSERT(used > 0 || dsl_dir_phys(dd)->dd_used_breakdown[type] >= -used); dsl_dir_phys(dd)->dd_used_breakdown[type] += used; #ifdef DEBUG dd_used_t t; uint64_t u = 0; for (t = 0; t < DD_USED_NUM; t++) u += dsl_dir_phys(dd)->dd_used_breakdown[t]; ASSERT3U(u, ==, dsl_dir_phys(dd)->dd_used_bytes); #endif } if (needlock) mutex_exit(&dd->dd_lock); if (dd->dd_parent != NULL) { dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, accounted_delta, compressed, uncompressed, tx); dsl_dir_transfer_space(dd->dd_parent, used - accounted_delta, - DD_USED_CHILD_RSRV, DD_USED_CHILD, tx); + DD_USED_CHILD_RSRV, DD_USED_CHILD, NULL); } } void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx) { - ASSERT(dmu_tx_is_syncing(tx)); + ASSERT(tx == NULL || dmu_tx_is_syncing(tx)); ASSERT(oldtype < DD_USED_NUM); ASSERT(newtype < DD_USED_NUM); if (delta == 0 || !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN)) return; - dmu_buf_will_dirty(dd->dd_dbuf, tx); + if (tx != NULL) + dmu_buf_will_dirty(dd->dd_dbuf, tx); mutex_enter(&dd->dd_lock); ASSERT(delta > 0 ? dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta : dsl_dir_phys(dd)->dd_used_breakdown[newtype] >= -delta); ASSERT(dsl_dir_phys(dd)->dd_used_bytes >= ABS(delta)); dsl_dir_phys(dd)->dd_used_breakdown[oldtype] -= delta; dsl_dir_phys(dd)->dd_used_breakdown[newtype] += delta; mutex_exit(&dd->dd_lock); } typedef struct dsl_dir_set_qr_arg { const char *ddsqra_name; zprop_source_t ddsqra_source; uint64_t ddsqra_value; } dsl_dir_set_qr_arg_t; static int dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx) { dsl_dir_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; int error; uint64_t towrite, newval; error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); if (error != 0) return (error); error = dsl_prop_predict(ds->ds_dir, "quota", ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } if (newval == 0) { dsl_dataset_rele(ds, FTAG); return (0); } mutex_enter(&ds->ds_dir->dd_lock); /* * If we are doing the preliminary check in open context, and * there are pending changes, then don't fail it, since the * pending changes could under-estimate the amount of space to be * freed up. */ towrite = dsl_dir_space_towrite(ds->ds_dir); if ((dmu_tx_is_syncing(tx) || towrite == 0) && (newval < dsl_dir_phys(ds->ds_dir)->dd_reserved || newval < dsl_dir_phys(ds->ds_dir)->dd_used_bytes + towrite)) { error = SET_ERROR(ENOSPC); } mutex_exit(&ds->ds_dir->dd_lock); dsl_dataset_rele(ds, FTAG); return (error); } static void dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx) { dsl_dir_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; uint64_t newval; VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) { dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA), ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, &ddsqra->ddsqra_value, tx); VERIFY0(dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_QUOTA), &newval)); } else { newval = ddsqra->ddsqra_value; spa_history_log_internal_ds(ds, "set", tx, "%s=%lld", zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval); } dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); mutex_enter(&ds->ds_dir->dd_lock); dsl_dir_phys(ds->ds_dir)->dd_quota = newval; mutex_exit(&ds->ds_dir->dd_lock); dsl_dataset_rele(ds, FTAG); } int dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota) { dsl_dir_set_qr_arg_t ddsqra; ddsqra.ddsqra_name = ddname; ddsqra.ddsqra_source = source; ddsqra.ddsqra_value = quota; return (dsl_sync_task(ddname, dsl_dir_set_quota_check, dsl_dir_set_quota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); } int dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx) { dsl_dir_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; dsl_dir_t *dd; uint64_t newval, used, avail; int error; error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); if (error != 0) return (error); dd = ds->ds_dir; /* * If we are doing the preliminary check in open context, the * space estimates may be inaccurate. */ if (!dmu_tx_is_syncing(tx)) { dsl_dataset_rele(ds, FTAG); return (0); } error = dsl_prop_predict(ds->ds_dir, zfs_prop_to_name(ZFS_PROP_RESERVATION), ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); if (error != 0) { dsl_dataset_rele(ds, FTAG); return (error); } mutex_enter(&dd->dd_lock); used = dsl_dir_phys(dd)->dd_used_bytes; mutex_exit(&dd->dd_lock); if (dd->dd_parent) { avail = dsl_dir_space_available(dd->dd_parent, NULL, 0, FALSE); } else { avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used; } if (MAX(used, newval) > MAX(used, dsl_dir_phys(dd)->dd_reserved)) { uint64_t delta = MAX(used, newval) - MAX(used, dsl_dir_phys(dd)->dd_reserved); if (delta > avail || (dsl_dir_phys(dd)->dd_quota > 0 && newval > dsl_dir_phys(dd)->dd_quota)) error = SET_ERROR(ENOSPC); } dsl_dataset_rele(ds, FTAG); return (error); } void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx) { uint64_t used; int64_t delta; dmu_buf_will_dirty(dd->dd_dbuf, tx); mutex_enter(&dd->dd_lock); used = dsl_dir_phys(dd)->dd_used_bytes; delta = MAX(used, value) - MAX(used, dsl_dir_phys(dd)->dd_reserved); dsl_dir_phys(dd)->dd_reserved = value; if (dd->dd_parent != NULL) { /* Roll up this additional usage into our ancestors */ dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, delta, 0, 0, tx); } mutex_exit(&dd->dd_lock); } static void dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx) { dsl_dir_set_qr_arg_t *ddsqra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dataset_t *ds; uint64_t newval; VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) { dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_RESERVATION), ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, &ddsqra->ddsqra_value, tx); VERIFY0(dsl_prop_get_int_ds(ds, zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval)); } else { newval = ddsqra->ddsqra_value; spa_history_log_internal_ds(ds, "set", tx, "%s=%lld", zfs_prop_to_name(ZFS_PROP_RESERVATION), (longlong_t)newval); } dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx); dsl_dataset_rele(ds, FTAG); } int dsl_dir_set_reservation(const char *ddname, zprop_source_t source, uint64_t reservation) { dsl_dir_set_qr_arg_t ddsqra; ddsqra.ddsqra_name = ddname; ddsqra.ddsqra_source = source; ddsqra.ddsqra_value = reservation; return (dsl_sync_task(ddname, dsl_dir_set_reservation_check, dsl_dir_set_reservation_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); } static dsl_dir_t * closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2) { for (; ds1; ds1 = ds1->dd_parent) { dsl_dir_t *dd; for (dd = ds2; dd; dd = dd->dd_parent) { if (ds1 == dd) return (dd); } } return (NULL); } /* * If delta is applied to dd, how much of that delta would be applied to * ancestor? Syncing context only. */ static int64_t would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor) { if (dd == ancestor) return (delta); mutex_enter(&dd->dd_lock); delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, delta); mutex_exit(&dd->dd_lock); return (would_change(dd->dd_parent, delta, ancestor)); } typedef struct dsl_dir_rename_arg { const char *ddra_oldname; const char *ddra_newname; cred_t *ddra_cred; } dsl_dir_rename_arg_t; /* ARGSUSED */ static int dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) { int *deltap = arg; char namebuf[MAXNAMELEN]; dsl_dataset_name(ds, namebuf); if (strlen(namebuf) + *deltap >= MAXNAMELEN) return (SET_ERROR(ENAMETOOLONG)); return (0); } static int dsl_dir_rename_check(void *arg, dmu_tx_t *tx) { dsl_dir_rename_arg_t *ddra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dir_t *dd, *newparent; const char *mynewname; int error; int delta = strlen(ddra->ddra_newname) - strlen(ddra->ddra_oldname); /* target dir should exist */ error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL); if (error != 0) return (error); /* new parent should exist */ error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent, &mynewname); if (error != 0) { dsl_dir_rele(dd, FTAG); return (error); } /* can't rename to different pool */ if (dd->dd_pool != newparent->dd_pool) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (SET_ERROR(ENXIO)); } /* new name should not already exist */ if (mynewname == NULL) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (SET_ERROR(EEXIST)); } /* if the name length is growing, validate child name lengths */ if (delta > 0) { error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename, &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); if (error != 0) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (error); } } if (dmu_tx_is_syncing(tx)) { if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { /* * Although this is the check function and we don't * normally make on-disk changes in check functions, * we need to do that here. * * Ensure this portion of the tree's counts have been * initialized in case the new parent has limits set. */ dsl_dir_init_fs_ss_count(dd, tx); } } if (newparent != dd->dd_parent) { /* is there enough space? */ uint64_t myspace = MAX(dsl_dir_phys(dd)->dd_used_bytes, dsl_dir_phys(dd)->dd_reserved); objset_t *os = dd->dd_pool->dp_meta_objset; uint64_t fs_cnt = 0; uint64_t ss_cnt = 0; if (dsl_dir_is_zapified(dd)) { int err; err = zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1, &fs_cnt); if (err != ENOENT && err != 0) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (err); } /* * have to add 1 for the filesystem itself that we're * moving */ fs_cnt++; err = zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1, &ss_cnt); if (err != ENOENT && err != 0) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (err); } } /* no rename into our descendant */ if (closest_common_ancestor(dd, newparent) == dd) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (SET_ERROR(EINVAL)); } error = dsl_dir_transfer_possible(dd->dd_parent, newparent, fs_cnt, ss_cnt, myspace, ddra->ddra_cred); if (error != 0) { dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (error); } } dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); return (0); } static void dsl_dir_rename_sync(void *arg, dmu_tx_t *tx) { dsl_dir_rename_arg_t *ddra = arg; dsl_pool_t *dp = dmu_tx_pool(tx); dsl_dir_t *dd, *newparent; const char *mynewname; int error; objset_t *mos = dp->dp_meta_objset; VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL)); VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent, &mynewname)); /* Log this before we change the name. */ spa_history_log_internal_dd(dd, "rename", tx, "-> %s", ddra->ddra_newname); if (newparent != dd->dd_parent) { objset_t *os = dd->dd_pool->dp_meta_objset; uint64_t fs_cnt = 0; uint64_t ss_cnt = 0; /* * We already made sure the dd counts were initialized in the * check function. */ if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { VERIFY0(zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1, &fs_cnt)); /* add 1 for the filesystem itself that we're moving */ fs_cnt++; VERIFY0(zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1, &ss_cnt)); } dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt, DD_FIELD_FILESYSTEM_COUNT, tx); dsl_fs_ss_count_adjust(newparent, fs_cnt, DD_FIELD_FILESYSTEM_COUNT, tx); dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt, DD_FIELD_SNAPSHOT_COUNT, tx); dsl_fs_ss_count_adjust(newparent, ss_cnt, DD_FIELD_SNAPSHOT_COUNT, tx); dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, -dsl_dir_phys(dd)->dd_used_bytes, -dsl_dir_phys(dd)->dd_compressed_bytes, -dsl_dir_phys(dd)->dd_uncompressed_bytes, tx); dsl_dir_diduse_space(newparent, DD_USED_CHILD, dsl_dir_phys(dd)->dd_used_bytes, dsl_dir_phys(dd)->dd_compressed_bytes, dsl_dir_phys(dd)->dd_uncompressed_bytes, tx); if (dsl_dir_phys(dd)->dd_reserved > dsl_dir_phys(dd)->dd_used_bytes) { uint64_t unused_rsrv = dsl_dir_phys(dd)->dd_reserved - dsl_dir_phys(dd)->dd_used_bytes; dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, -unused_rsrv, 0, 0, tx); dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV, unused_rsrv, 0, 0, tx); } } dmu_buf_will_dirty(dd->dd_dbuf, tx); /* remove from old parent zapobj */ error = zap_remove(mos, dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj, dd->dd_myname, tx); ASSERT0(error); (void) strcpy(dd->dd_myname, mynewname); dsl_dir_rele(dd->dd_parent, dd); dsl_dir_phys(dd)->dd_parent_obj = newparent->dd_object; VERIFY0(dsl_dir_hold_obj(dp, newparent->dd_object, NULL, dd, &dd->dd_parent)); /* add to new parent zapobj */ VERIFY0(zap_add(mos, dsl_dir_phys(newparent)->dd_child_dir_zapobj, dd->dd_myname, 8, 1, &dd->dd_object, tx)); #ifdef __FreeBSD__ #ifdef _KERNEL zfsvfs_update_fromname(ddra->ddra_oldname, ddra->ddra_newname); zvol_rename_minors(ddra->ddra_oldname, ddra->ddra_newname); #endif #endif dsl_prop_notify_all(dd); dsl_dir_rele(newparent, FTAG); dsl_dir_rele(dd, FTAG); } int dsl_dir_rename(const char *oldname, const char *newname) { dsl_dir_rename_arg_t ddra; ddra.ddra_oldname = oldname; ddra.ddra_newname = newname; ddra.ddra_cred = CRED(); return (dsl_sync_task(oldname, dsl_dir_rename_check, dsl_dir_rename_sync, &ddra, 3, ZFS_SPACE_CHECK_RESERVED)); } int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *cr) { dsl_dir_t *ancestor; int64_t adelta; uint64_t avail; int err; ancestor = closest_common_ancestor(sdd, tdd); adelta = would_change(sdd, -space, ancestor); avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE); if (avail < space) return (SET_ERROR(ENOSPC)); err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT, ancestor, cr); if (err != 0) return (err); err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT, ancestor, cr); if (err != 0) return (err); return (0); } timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd) { timestruc_t t; mutex_enter(&dd->dd_lock); t = dd->dd_snap_cmtime; mutex_exit(&dd->dd_lock); return (t); } void dsl_dir_snap_cmtime_update(dsl_dir_t *dd) { timestruc_t t; gethrestime(&t); mutex_enter(&dd->dd_lock); dd->dd_snap_cmtime = t; mutex_exit(&dd->dd_lock); } void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx) { objset_t *mos = dd->dd_pool->dp_meta_objset; dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx); } boolean_t dsl_dir_is_zapified(dsl_dir_t *dd) { dmu_object_info_t doi; dmu_object_info_from_db(dd->dd_dbuf, &doi); return (doi.doi_type == DMU_OTN_ZAP_METADATA); } Index: stable/10 =================================================================== --- stable/10 (revision 278141) +++ stable/10 (revision 278142) Property changes on: stable/10 ___________________________________________________________________ Modified: svn:mergeinfo ## -0,0 +0,1 ## Merged /head:r277419