| /* |
| * 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, 2018 by Delphix. All rights reserved. |
| * Copyright (c) 2014, Joyent, Inc. All rights reserved. |
| * Copyright (c) 2014 RackTop Systems. |
| * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
| * Copyright (c) 2016 Actifio, Inc. All rights reserved. |
| * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. |
| * Copyright 2017 Nexenta Systems, Inc. |
| */ |
| |
| #include <sys/dmu_objset.h> |
| #include <sys/dsl_dataset.h> |
| #include <sys/dsl_dir.h> |
| #include <sys/dsl_prop.h> |
| #include <sys/dsl_synctask.h> |
| #include <sys/dmu_traverse.h> |
| #include <sys/dmu_impl.h> |
| #include <sys/dmu_tx.h> |
| #include <sys/arc.h> |
| #include <sys/zio.h> |
| #include <sys/zap.h> |
| #include <sys/zfeature.h> |
| #include <sys/unique.h> |
| #include <sys/zfs_context.h> |
| #include <sys/zfs_ioctl.h> |
| #include <sys/spa.h> |
| #include <sys/spa_impl.h> |
| #include <sys/vdev.h> |
| #include <sys/zfs_znode.h> |
| #include <sys/zfs_onexit.h> |
| #include <sys/zvol.h> |
| #include <sys/dsl_scan.h> |
| #include <sys/dsl_deadlist.h> |
| #include <sys/dsl_destroy.h> |
| #include <sys/dsl_userhold.h> |
| #include <sys/dsl_bookmark.h> |
| #include <sys/policy.h> |
| #include <sys/dmu_recv.h> |
| #include <sys/zio_compress.h> |
| #include <zfs_fletcher.h> |
| #include <sys/zio_checksum.h> |
| |
| /* |
| * 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; |
| |
| #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); |
| |
| static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, |
| uint64_t obj, dmu_tx_t *tx); |
| static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, |
| dmu_tx_t *tx); |
| |
| static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); |
| |
| extern int spa_asize_inflation; |
| |
| static zil_header_t zero_zil; |
| |
| /* |
| * Figure out how much of this delta should be propagated 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, compressed, uncompressed; |
| int64_t delta; |
| |
| used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); |
| compressed = BP_GET_PSIZE(bp); |
| uncompressed = BP_GET_UCSIZE(bp); |
| |
| 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; |
| } |
| |
| ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); |
| 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_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = |
| (void *)B_TRUE; |
| } |
| |
| spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); |
| if (f != SPA_FEATURE_NONE) { |
| ASSERT3S(spa_feature_table[f].fi_type, ==, |
| ZFEATURE_TYPE_BOOLEAN); |
| ds->ds_feature_activation[f] = (void *)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); |
| } |
| |
| /* |
| * Called when the specified segment has been remapped, and is thus no |
| * longer referenced in the head dataset. The vdev must be indirect. |
| * |
| * If the segment is referenced by a snapshot, put it on the remap deadlist. |
| * Otherwise, add this segment to the obsolete spacemap. |
| */ |
| void |
| dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, |
| uint64_t size, uint64_t birth, dmu_tx_t *tx) |
| { |
| spa_t *spa = ds->ds_dir->dd_pool->dp_spa; |
| |
| ASSERT(dmu_tx_is_syncing(tx)); |
| ASSERT(birth <= tx->tx_txg); |
| ASSERT(!ds->ds_is_snapshot); |
| |
| if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { |
| spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); |
| } else { |
| blkptr_t fakebp; |
| dva_t *dva = &fakebp.blk_dva[0]; |
| |
| ASSERT(ds != NULL); |
| |
| mutex_enter(&ds->ds_remap_deadlist_lock); |
| if (!dsl_dataset_remap_deadlist_exists(ds)) { |
| dsl_dataset_create_remap_deadlist(ds, tx); |
| } |
| mutex_exit(&ds->ds_remap_deadlist_lock); |
| |
| BP_ZERO(&fakebp); |
| fakebp.blk_birth = birth; |
| DVA_SET_VDEV(dva, vdev); |
| DVA_SET_OFFSET(dva, offset); |
| DVA_SET_ASIZE(dva, size); |
| |
| dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, tx); |
| } |
| } |
| |
| int |
| dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, |
| boolean_t async) |
| { |
| spa_t *spa = dmu_tx_pool(tx)->dp_spa; |
| |
| int used = bp_get_dsize_sync(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(!ds->ds_is_snapshot); |
| 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); |
| } 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); |
| } |
| |
| struct feature_type_uint64_array_arg { |
| uint64_t length; |
| uint64_t *array; |
| }; |
| |
| static void |
| unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) |
| { |
| switch (spa_feature_table[f].fi_type) { |
| case ZFEATURE_TYPE_BOOLEAN: |
| break; |
| case ZFEATURE_TYPE_UINT64_ARRAY: |
| { |
| struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; |
| kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); |
| kmem_free(ftuaa, sizeof (*ftuaa)); |
| break; |
| } |
| default: |
| panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); |
| } |
| } |
| |
| static int |
| load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) |
| { |
| int err = 0; |
| switch (spa_feature_table[f].fi_type) { |
| case ZFEATURE_TYPE_BOOLEAN: |
| err = zap_contains(mos, ds->ds_object, |
| spa_feature_table[f].fi_guid); |
| if (err == 0) { |
| ds->ds_feature[f] = (void *)B_TRUE; |
| } else { |
| ASSERT3U(err, ==, ENOENT); |
| err = 0; |
| } |
| break; |
| case ZFEATURE_TYPE_UINT64_ARRAY: |
| { |
| uint64_t int_size, num_int; |
| uint64_t *data; |
| err = zap_length(mos, ds->ds_object, |
| spa_feature_table[f].fi_guid, &int_size, &num_int); |
| if (err != 0) { |
| ASSERT3U(err, ==, ENOENT); |
| err = 0; |
| break; |
| } |
| ASSERT3U(int_size, ==, sizeof (uint64_t)); |
| data = kmem_alloc(int_size * num_int, KM_SLEEP); |
| VERIFY0(zap_lookup(mos, ds->ds_object, |
| spa_feature_table[f].fi_guid, int_size, num_int, data)); |
| struct feature_type_uint64_array_arg *ftuaa = |
| kmem_alloc(sizeof (*ftuaa), KM_SLEEP); |
| ftuaa->length = num_int; |
| ftuaa->array = data; |
| ds->ds_feature[f] = ftuaa; |
| break; |
| } |
| default: |
| panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); |
| } |
| return (err); |
| } |
| |
| /* |
| * We have to release the fsid synchronously or we risk that a subsequent |
| * mount of the same dataset will fail to unique_insert the fsid. This |
| * failure would manifest itself as the fsid of this dataset changing |
| * between mounts which makes NFS clients quite unhappy. |
| */ |
| static void |
| dsl_dataset_evict_sync(void *dbu) |
| { |
| dsl_dataset_t *ds = dbu; |
| |
| ASSERT(ds->ds_owner == NULL); |
| |
| unique_remove(ds->ds_fsid_guid); |
| } |
| |
| static void |
| dsl_dataset_evict_async(void *dbu) |
| { |
| dsl_dataset_t *ds = dbu; |
| |
| ASSERT(ds->ds_owner == NULL); |
| |
| ds->ds_dbuf = NULL; |
| |
| 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_deadlist_is_open(&ds->ds_deadlist)) |
| dsl_deadlist_close(&ds->ds_deadlist); |
| if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) |
| dsl_deadlist_close(&ds->ds_remap_deadlist); |
| if (ds->ds_dir) |
| dsl_dir_async_rele(ds->ds_dir, ds); |
| |
| ASSERT(!list_link_active(&ds->ds_synced_link)); |
| |
| for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { |
| if (dsl_dataset_feature_is_active(ds, f)) |
| unload_zfeature(ds, f); |
| } |
| |
| list_destroy(&ds->ds_prop_cbs); |
| mutex_destroy(&ds->ds_lock); |
| mutex_destroy(&ds->ds_opening_lock); |
| mutex_destroy(&ds->ds_sendstream_lock); |
| mutex_destroy(&ds->ds_remap_deadlist_lock); |
| zfs_refcount_destroy(&ds->ds_longholds); |
| rrw_destroy(&ds->ds_bp_rwlock); |
| |
| 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); |
| if (err != 0 && zfs_recover == B_TRUE) { |
| err = 0; |
| (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), |
| "SNAPOBJ=%llu-ERR=%d", |
| (unsigned long long)ds->ds_object, err); |
| } |
| 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 = 0; |
| int err; |
| |
| if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) |
| mt = MT_NORMALIZE; |
| |
| err = zap_lookup_norm(mos, snapobj, name, 8, 1, |
| value, mt, NULL, 0, NULL); |
| if (err == ENOTSUP && (mt & MT_NORMALIZE)) |
| 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 = 0; |
| int err; |
| |
| dsl_dir_snap_cmtime_update(ds->ds_dir); |
| |
| if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) |
| mt = MT_NORMALIZE; |
| |
| err = zap_remove_norm(mos, snapobj, name, mt, tx); |
| if (err == ENOTSUP && (mt & MT_NORMALIZE)) |
| 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); |
| } |
| |
| boolean_t |
| dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) |
| { |
| dmu_buf_t *dbuf = ds->ds_dbuf; |
| boolean_t result = B_FALSE; |
| |
| if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, |
| ds->ds_object, DMU_BONUS_BLKID, tag)) { |
| |
| if (ds == dmu_buf_get_user(dbuf)) |
| result = B_TRUE; |
| else |
| dmu_buf_rele(dbuf, tag); |
| } |
| |
| return (result); |
| } |
| |
| 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; |
| ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; |
| list_link_init(&ds->ds_synced_link); |
| |
| err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, |
| NULL, ds, &ds->ds_dir); |
| if (err != 0) { |
| kmem_free(ds, sizeof (dsl_dataset_t)); |
| dmu_buf_rele(dbuf, tag); |
| return (err); |
| } |
| |
| 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); |
| mutex_init(&ds->ds_remap_deadlist_lock, |
| NULL, MUTEX_DEFAULT, NULL); |
| rrw_init(&ds->ds_bp_rwlock, B_FALSE); |
| zfs_refcount_create(&ds->ds_longholds); |
| |
| bplist_create(&ds->ds_pending_deadlist); |
| |
| list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), |
| offsetof(dmu_sendarg_t, dsa_link)); |
| |
| list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), |
| offsetof(dsl_prop_cb_record_t, cbr_ds_node)); |
| |
| if (doi.doi_type == DMU_OTN_ZAP_METADATA) { |
| spa_feature_t f; |
| |
| for (f = 0; f < SPA_FEATURES; f++) { |
| if (!(spa_feature_table[f].fi_flags & |
| ZFEATURE_FLAG_PER_DATASET)) |
| continue; |
| err = load_zfeature(mos, ds, f); |
| } |
| } |
| |
| if (!ds->ds_is_snapshot) { |
| 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 && !ds->ds_is_snapshot) { |
| 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 && ds->ds_dir->dd_crypto_obj != 0 && |
| ds->ds_is_snapshot && |
| zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { |
| dp->dp_spa->spa_errata = |
| ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; |
| } |
| |
| dsl_deadlist_open(&ds->ds_deadlist, |
| mos, dsl_dataset_phys(ds)->ds_deadlist_obj); |
| uint64_t remap_deadlist_obj = |
| dsl_dataset_get_remap_deadlist_object(ds); |
| if (remap_deadlist_obj != 0) { |
| dsl_deadlist_open(&ds->ds_remap_deadlist, mos, |
| remap_deadlist_obj); |
| } |
| |
| dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, |
| dsl_dataset_evict_async, &ds->ds_dbuf); |
| if (err == 0) |
| winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); |
| |
| if (err != 0 || winner != NULL) { |
| bplist_destroy(&ds->ds_pending_deadlist); |
| dsl_deadlist_close(&ds->ds_deadlist); |
| if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) |
| dsl_deadlist_close(&ds->ds_remap_deadlist); |
| if (ds->ds_prev) |
| dsl_dataset_rele(ds->ds_prev, ds); |
| dsl_dir_rele(ds->ds_dir, ds); |
| list_destroy(&ds->ds_prop_cbs); |
| list_destroy(&ds->ds_sendstreams); |
| mutex_destroy(&ds->ds_lock); |
| mutex_destroy(&ds->ds_opening_lock); |
| mutex_destroy(&ds->ds_sendstream_lock); |
| mutex_destroy(&ds->ds_remap_deadlist_lock); |
| zfs_refcount_destroy(&ds->ds_longholds); |
| rrw_destroy(&ds->ds_bp_rwlock); |
| 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); |
| if (ds->ds_fsid_guid != |
| dsl_dataset_phys(ds)->ds_fsid_guid) { |
| zfs_dbgmsg("ds_fsid_guid changed from " |
| "%llx to %llx for pool %s dataset id %llu", |
| (long long) |
| dsl_dataset_phys(ds)->ds_fsid_guid, |
| (long long)ds->ds_fsid_guid, |
| spa_name(dp->dp_spa), |
| dsobj); |
| } |
| } |
| } |
| |
| 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_create_key_mapping(dsl_dataset_t *ds) |
| { |
| dsl_dir_t *dd = ds->ds_dir; |
| |
| if (dd->dd_crypto_obj == 0) |
| return (0); |
| |
| return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, |
| ds, ds, &ds->ds_key_mapping)); |
| } |
| |
| int |
| dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, |
| ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) |
| { |
| int err; |
| |
| err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); |
| if (err != 0) |
| return (err); |
| |
| ASSERT3P(*dsp, !=, NULL); |
| |
| if (flags & DS_HOLD_FLAG_DECRYPT) { |
| err = dsl_dataset_create_key_mapping(*dsp); |
| if (err != 0) |
| dsl_dataset_rele(*dsp, tag); |
| } |
| |
| return (err); |
| } |
| |
| int |
| dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, |
| void *tag, dsl_dataset_t **dsp) |
| { |
| dsl_dir_t *dd; |
| const char *snapname; |
| uint64_t obj; |
| int err = 0; |
| dsl_dataset_t *ds; |
| |
| 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_flags(dp, obj, flags, tag, &ds); |
| else |
| err = SET_ERROR(ENOENT); |
| |
| /* we may be looking for a snapshot */ |
| if (err == 0 && snapname != NULL) { |
| dsl_dataset_t *snap_ds; |
| |
| if (*snapname++ != '@') { |
| dsl_dataset_rele_flags(ds, flags, tag); |
| dsl_dir_rele(dd, FTAG); |
| return (SET_ERROR(ENOENT)); |
| } |
| |
| dprintf("looking for snapshot '%s'\n", snapname); |
| err = dsl_dataset_snap_lookup(ds, snapname, &obj); |
| if (err == 0) { |
| err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, |
| &snap_ds); |
| } |
| dsl_dataset_rele_flags(ds, flags, tag); |
| |
| if (err == 0) { |
| mutex_enter(&snap_ds->ds_lock); |
| if (snap_ds->ds_snapname[0] == 0) |
| (void) strlcpy(snap_ds->ds_snapname, snapname, |
| sizeof (snap_ds->ds_snapname)); |
| mutex_exit(&snap_ds->ds_lock); |
| ds = snap_ds; |
| } |
| } |
| if (err == 0) |
| *dsp = ds; |
| dsl_dir_rele(dd, FTAG); |
| return (err); |
| } |
| |
| int |
| dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, |
| dsl_dataset_t **dsp) |
| { |
| return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); |
| } |
| |
| int |
| dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, |
| void *tag, dsl_dataset_t **dsp) |
| { |
| int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); |
| if (err != 0) |
| return (err); |
| if (!dsl_dataset_tryown(*dsp, tag)) { |
| dsl_dataset_rele_flags(*dsp, flags, tag); |
| *dsp = NULL; |
| return (SET_ERROR(EBUSY)); |
| } |
| return (0); |
| } |
| |
| int |
| dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, |
| void *tag, dsl_dataset_t **dsp) |
| { |
| int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); |
| if (err != 0) |
| return (err); |
| if (!dsl_dataset_tryown(*dsp, tag)) { |
| dsl_dataset_rele_flags(*dsp, flags, 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) zfs_refcount_add(&ds->ds_longholds, tag); |
| } |
| |
| void |
| dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) |
| { |
| (void) zfs_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 (!zfs_refcount_is_zero(&ds->ds_longholds)); |
| } |
| |
| void |
| dsl_dataset_name(dsl_dataset_t *ds, char *name) |
| { |
| if (ds == NULL) { |
| (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); |
| } else { |
| dsl_dir_name(ds->ds_dir, name); |
| VERIFY0(dsl_dataset_get_snapname(ds)); |
| if (ds->ds_snapname[0]) { |
| VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), |
| <, ZFS_MAX_DATASET_NAME_LEN); |
| /* |
| * 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); |
| VERIFY3U(strlcat(name, ds->ds_snapname, |
| ZFS_MAX_DATASET_NAME_LEN), <, |
| ZFS_MAX_DATASET_NAME_LEN); |
| mutex_exit(&ds->ds_lock); |
| } else { |
| VERIFY3U(strlcat(name, ds->ds_snapname, |
| ZFS_MAX_DATASET_NAME_LEN), <, |
| ZFS_MAX_DATASET_NAME_LEN); |
| } |
| } |
| } |
| } |
| |
| int |
| dsl_dataset_namelen(dsl_dataset_t *ds) |
| { |
| VERIFY0(dsl_dataset_get_snapname(ds)); |
| mutex_enter(&ds->ds_lock); |
| int len = strlen(ds->ds_snapname); |
| mutex_exit(&ds->ds_lock); |
| /* add '@' if ds is a snap */ |
| if (len > 0) |
| len++; |
| len += dsl_dir_namelen(ds->ds_dir); |
| return (len); |
| } |
| |
| void |
| dsl_dataset_rele(dsl_dataset_t *ds, void *tag) |
| { |
| dmu_buf_rele(ds->ds_dbuf, tag); |
| } |
| |
| void |
| dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) |
| { |
| dsl_dir_t *dd = ds->ds_dir; |
| |
| if (dd == NULL || dd->dd_crypto_obj == 0) |
| return; |
| |
| (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, |
| ds->ds_object, ds); |
| } |
| |
| void |
| dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) |
| { |
| if (flags & DS_HOLD_FLAG_DECRYPT) |
| dsl_dataset_remove_key_mapping(ds); |
| |
| dsl_dataset_rele(ds, tag); |
| } |
| |
| void |
| dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, 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_flags(ds, flags, tag); |
| } |
| |
| boolean_t |
| dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) |
| { |
| boolean_t gotit = FALSE; |
| |
| ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); |
| 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); |
| } |
| |
| boolean_t |
| dsl_dataset_has_owner(dsl_dataset_t *ds) |
| { |
| boolean_t rv; |
| mutex_enter(&ds->ds_lock); |
| rv = (ds->ds_owner != NULL); |
| mutex_exit(&ds->ds_lock); |
| return (rv); |
| } |
| |
| static boolean_t |
| zfeature_active(spa_feature_t f, void *arg) |
| { |
| switch (spa_feature_table[f].fi_type) { |
| case ZFEATURE_TYPE_BOOLEAN: { |
| boolean_t val = (boolean_t)arg; |
| ASSERT(val == B_FALSE || val == B_TRUE); |
| return (val); |
| } |
| case ZFEATURE_TYPE_UINT64_ARRAY: |
| /* |
| * In this case, arg is a uint64_t array. The feature is active |
| * if the array is non-null. |
| */ |
| return (arg != NULL); |
| default: |
| panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); |
| return (B_FALSE); |
| } |
| } |
| |
| boolean_t |
| dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) |
| { |
| return (zfeature_active(f, ds->ds_feature[f])); |
| } |
| |
| /* |
| * The buffers passed out by this function are references to internal buffers; |
| * they should not be freed by callers of this function, and they should not be |
| * used after the dataset has been released. |
| */ |
| boolean_t |
| dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, |
| uint64_t *outlength, uint64_t **outp) |
| { |
| VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); |
| if (!dsl_dataset_feature_is_active(ds, f)) { |
| return (B_FALSE); |
| } |
| struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; |
| *outp = ftuaa->array; |
| *outlength = ftuaa->length; |
| return (B_TRUE); |
| } |
| |
| void |
| dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, |
| 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; |
| |
| VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); |
| |
| spa_feature_incr(spa, f, tx); |
| dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); |
| |
| switch (spa_feature_table[f].fi_type) { |
| case ZFEATURE_TYPE_BOOLEAN: |
| ASSERT3S((boolean_t)arg, ==, B_TRUE); |
| VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, |
| sizeof (zero), 1, &zero, tx)); |
| break; |
| case ZFEATURE_TYPE_UINT64_ARRAY: |
| { |
| struct feature_type_uint64_array_arg *ftuaa = arg; |
| VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, |
| sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); |
| break; |
| } |
| default: |
| panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); |
| } |
| } |
| |
| void |
| dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, |
| 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 dsobj = ds->ds_object; |
| |
| VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); |
| |
| VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); |
| spa_feature_decr(spa, f, tx); |
| ds->ds_feature[f] = NULL; |
| } |
| |
| void |
| dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) |
| { |
| unload_zfeature(ds, f); |
| dsl_dataset_deactivate_feature_impl(ds, f, tx); |
| } |
| |
| uint64_t |
| dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, |
| dsl_crypto_params_t *dcp, 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(); |
| (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, |
| sizeof (dsphys->ds_guid)); |
| dsphys->ds_snapnames_zapobj = |
| zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, |
| DMU_OT_NONE, 0, tx); |
| dsphys->ds_creation_time = gethrestime_sec(); |
| dsphys->ds_creation_txg = tx->tx_txg == 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; |
| rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); |
| dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; |
| rrw_exit(&origin->ds_bp_rwlock, FTAG); |
| |
| /* |
| * 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); |
| |
| for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { |
| if (zfeature_active(f, origin->ds_feature[f])) { |
| dsl_dataset_activate_feature(dsobj, f, |
| origin->ds_feature[f], 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)); |
| } |
| } |
| |
| /* handle encryption */ |
| dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, 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)); |
| if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { |
| dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| zio_t *zio; |
| |
| bzero(&os->os_zil_header, sizeof (os->os_zil_header)); |
| if (os->os_encrypted) |
| os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; |
| |
| zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); |
| dsl_dataset_sync(ds, zio, tx); |
| VERIFY0(zio_wait(zio)); |
| |
| /* dsl_dataset_sync_done will drop this reference. */ |
| dmu_buf_add_ref(ds->ds_dbuf, ds); |
| dsl_dataset_sync_done(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, |
| dsl_crypto_params_t *dcp, 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, dcp, |
| 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); |
| } |
| |
| /* |
| * 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(!ds->ds_is_snapshot); |
| |
| 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; |
| ASSERTV(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); |
| } |
| |
| 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!"); |
| |
| /* Must not dirty a dataset in the same txg where it got snapshotted. */ |
| ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); |
| |
| dp = ds->ds_dir->dd_pool; |
| if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { |
| objset_t *os = ds->ds_objset; |
| |
| /* up the hold count until we can be written out */ |
| dmu_buf_add_ref(ds->ds_dbuf, ds); |
| |
| /* if this dataset is encrypted, grab a reference to the DCK */ |
| if (ds->ds_dir->dd_crypto_obj != 0 && |
| !os->os_raw_receive && |
| !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { |
| ASSERT3P(ds->ds_key_mapping, !=, NULL); |
| key_mapping_add_ref(ds->ds_key_mapping, ds); |
| } |
| } |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| 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)) { |
| char *nm; |
| nvlist_t *cnt_track = NULL; |
| cnt_track = fnvlist_alloc(); |
| |
| nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); |
| |
| /* 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; |
| |
| (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); |
| 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); |
| } |
| |
| kmem_free(nm, MAXPATHLEN); |
| |
| /* 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 = NULL; |
| char dsname[ZFS_MAX_DATASET_NAME_LEN]; |
| |
| name = nvpair_name(pair); |
| if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) |
| 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) |
| { |
| 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; |
| ASSERTV(static zil_header_t zero_zil); |
| ASSERTV(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); |
| |
| /* Should not snapshot a dirty dataset. */ |
| ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, |
| ds, tx->tx_txg)); |
| |
| 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(); |
| (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, |
| sizeof (dsphys->ds_guid)); |
| 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; |
| rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
| dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; |
| rrw_exit(&ds->ds_bp_rwlock, FTAG); |
| dmu_buf_rele(dbuf, FTAG); |
| |
| for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { |
| if (zfeature_active(f, ds->ds_feature[f])) { |
| dsl_dataset_activate_feature(dsobj, f, |
| ds->ds_feature[f], 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); |
| |
| if (dsl_dataset_remap_deadlist_exists(ds)) { |
| uint64_t remap_deadlist_obj = |
| dsl_dataset_get_remap_deadlist_object(ds); |
| /* |
| * Move the remap_deadlist to the snapshot. The head |
| * will create a new remap deadlist on demand, from |
| * dsl_dataset_block_remapped(). |
| */ |
| dsl_dataset_unset_remap_deadlist_object(ds, tx); |
| dsl_deadlist_close(&ds->ds_remap_deadlist); |
| |
| dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); |
| VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, |
| sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); |
| } |
| |
| /* |
| * Create a ivset guid for this snapshot if the dataset is |
| * encrypted. This may be overridden by a raw receive. A |
| * previous implementation of this code did not have this |
| * field as part of the on-disk format for ZFS encryption |
| * (see errata #4). As part of the remediation for this |
| * issue, we ask the user to enable the bookmark_v2 feature |
| * which is now a dependency of the encryption feature. We |
| * use this as a heuristic to determine when the user has |
| * elected to correct any datasets created with the old code. |
| * As a result, we only do this step if the bookmark_v2 |
| * feature is enabled, which limits the number of states a |
| * given pool / dataset can be in with regards to terms of |
| * correcting the issue. |
| */ |
| if (ds->ds_dir->dd_crypto_obj != 0 && |
| spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { |
| uint64_t ivset_guid = unique_create(); |
| |
| dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); |
| VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, |
| sizeof (ivset_guid), 1, &ivset_guid, 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, ""); |
| } |
| |
| 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[ZFS_MAX_DATASET_NAME_LEN]; |
| |
| 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); |
| } |
| zvol_create_minors(dp->dp_spa, nvpair_name(pair), B_TRUE); |
| 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[ZFS_MAX_DATASET_NAME_LEN]; |
| 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); |
| } |
| |
| 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 = NULL; |
| |
| 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; |
| |
| if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { |
| VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, |
| ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, |
| &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); |
| VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, |
| ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, |
| &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); |
| VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, |
| ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, |
| &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); |
| ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; |
| ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; |
| ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; |
| } |
| |
| dmu_objset_sync(ds->ds_objset, zio, tx); |
| |
| for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { |
| if (zfeature_active(f, ds->ds_feature_activation[f])) { |
| if (zfeature_active(f, ds->ds_feature[f])) |
| continue; |
| dsl_dataset_activate_feature(ds->ds_object, f, |
| ds->ds_feature_activation[f], tx); |
| ds->ds_feature[f] = ds->ds_feature_activation[f]; |
| } |
| } |
| } |
| |
| static int |
| deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) |
| { |
| dsl_deadlist_t *dl = arg; |
| dsl_deadlist_insert(dl, bp, tx); |
| return (0); |
| } |
| |
| void |
| dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) |
| { |
| objset_t *os = ds->ds_objset; |
| |
| bplist_iterate(&ds->ds_pending_deadlist, |
| deadlist_enqueue_cb, &ds->ds_deadlist, tx); |
| |
| if (os->os_synced_dnodes != NULL) { |
| multilist_destroy(os->os_synced_dnodes); |
| os->os_synced_dnodes = NULL; |
| } |
| |
| if (os->os_encrypted) |
| os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; |
| else |
| ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); |
| |
| ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); |
| |
| dmu_buf_rele(ds->ds_dbuf, ds); |
| } |
| |
| int |
| get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) |
| { |
| uint64_t count = 0; |
| objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; |
| zap_cursor_t zc; |
| zap_attribute_t za; |
| |
| 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) { |
| return (ENOENT); |
| } |
| 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_MAX_DATASET_NAME_LEN]; |
| 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); |
| return (0); |
| } |
| |
| void |
| get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) |
| { |
| nvlist_t *propval = fnvlist_alloc(); |
| nvlist_t *val; |
| |
| /* |
| * We use nvlist_alloc() instead of fnvlist_alloc() because the |
| * latter would allocate the list with NV_UNIQUE_NAME flag. |
| * As a result, every time a clone name is appended to the list |
| * it would be (linearly) searched for a duplicate name. |
| * We already know that all clone names must be unique and we |
| * want avoid the quadratic complexity of double-checking that |
| * because we can have a large number of clones. |
| */ |
| VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP)); |
| |
| if (get_clones_stat_impl(ds, val) == 0) { |
| fnvlist_add_nvlist(propval, ZPROP_VALUE, val); |
| fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), |
| propval); |
| } |
| |
| nvlist_free(val); |
| nvlist_free(propval); |
| } |
| |
| /* |
| * Returns a string that represents the receive resume stats token. It should |
| * be freed with strfree(). |
| */ |
| char * |
| get_receive_resume_stats_impl(dsl_dataset_t *ds) |
| { |
| dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| |
| if (dsl_dataset_has_resume_receive_state(ds)) { |
| char *str; |
| void *packed; |
| uint8_t *compressed; |
| uint64_t val; |
| nvlist_t *token_nv = fnvlist_alloc(); |
| size_t packed_size, compressed_size; |
| |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { |
| fnvlist_add_uint64(token_nv, "fromguid", val); |
| } |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { |
| fnvlist_add_uint64(token_nv, "object", val); |
| } |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { |
| fnvlist_add_uint64(token_nv, "offset", val); |
| } |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { |
| fnvlist_add_uint64(token_nv, "bytes", val); |
| } |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { |
| fnvlist_add_uint64(token_nv, "toguid", val); |
| } |
| char buf[MAXNAMELEN]; |
| if (zap_lookup(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { |
| fnvlist_add_string(token_nv, "toname", buf); |
| } |
| if (zap_contains(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_LARGEBLOCK) == 0) { |
| fnvlist_add_boolean(token_nv, "largeblockok"); |
| } |
| if (zap_contains(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_EMBEDOK) == 0) { |
| fnvlist_add_boolean(token_nv, "embedok"); |
| } |
| if (zap_contains(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_COMPRESSOK) == 0) { |
| fnvlist_add_boolean(token_nv, "compressok"); |
| } |
| if (zap_contains(dp->dp_meta_objset, ds->ds_object, |
| DS_FIELD_RESUME_RAWOK) == 0) { |
| fnvlist_add_boolean(token_nv, "rawok"); |
| } |
| packed = fnvlist_pack(token_nv, &packed_size); |
| fnvlist_free(token_nv); |
| compressed = kmem_alloc(packed_size, KM_SLEEP); |
| |
| compressed_size = gzip_compress(packed, compressed, |
| packed_size, packed_size, 6); |
| |
| zio_cksum_t cksum; |
| fletcher_4_native_varsize(compressed, compressed_size, &cksum); |
| |
| size_t alloc_size = compressed_size * 2 + 1; |
| str = kmem_alloc(alloc_size, KM_SLEEP); |
| for (int i = 0; i < compressed_size; i++) { |
| size_t offset = i * 2; |
| (void) snprintf(str + offset, alloc_size - offset, |
| "%02x", compressed[i]); |
| } |
| str[compressed_size * 2] = '\0'; |
| char *propval = kmem_asprintf("%u-%llx-%llx-%s", |
| ZFS_SEND_RESUME_TOKEN_VERSION, |
| (longlong_t)cksum.zc_word[0], |
| (longlong_t)packed_size, str); |
| kmem_free(packed, packed_size); |
| kmem_free(str, alloc_size); |
| kmem_free(compressed, packed_size); |
| return (propval); |
| } |
| return (strdup("")); |
| } |
| |
| /* |
| * Returns a string that represents the receive resume stats token of the |
| * dataset's child. It should be freed with strfree(). |
| */ |
| char * |
| get_child_receive_stats(dsl_dataset_t *ds) |
| { |
| char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; |
| dsl_dataset_t *recv_ds; |
| dsl_dataset_name(ds, recvname); |
| if (strlcat(recvname, "/", sizeof (recvname)) < |
| sizeof (recvname) && |
| strlcat(recvname, recv_clone_name, sizeof (recvname)) < |
| sizeof (recvname) && |
| dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG, |
| &recv_ds) == 0) { |
| char *propval = get_receive_resume_stats_impl(recv_ds); |
| dsl_dataset_rele(recv_ds, FTAG); |
| return (propval); |
| } |
| return (strdup("")); |
| } |
| |
| static void |
| get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) |
| { |
| char *propval = get_receive_resume_stats_impl(ds); |
| if (strcmp(propval, "") != 0) { |
| dsl_prop_nvlist_add_string(nv, |
| ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); |
| } else { |
| char *childval = get_child_receive_stats(ds); |
| if (strcmp(childval, "") != 0) { |
| dsl_prop_nvlist_add_string(nv, |
| ZFS_PROP_RECEIVE_RESUME_TOKEN, childval); |
| } |
| strfree(childval); |
| } |
| strfree(propval); |
| } |
| |
| uint64_t |
| dsl_get_refratio(dsl_dataset_t *ds) |
| { |
| uint64_t 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); |
| return (ratio); |
| } |
| |
| uint64_t |
| dsl_get_logicalreferenced(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); |
| } |
| |
| uint64_t |
| dsl_get_compressratio(dsl_dataset_t *ds) |
| { |
| if (ds->ds_is_snapshot) { |
| return (dsl_get_refratio(ds)); |
| } else { |
| dsl_dir_t *dd = ds->ds_dir; |
| mutex_enter(&dd->dd_lock); |
| uint64_t val = dsl_dir_get_compressratio(dd); |
| mutex_exit(&dd->dd_lock); |
| return (val); |
| } |
| } |
| |
| uint64_t |
| dsl_get_used(dsl_dataset_t *ds) |
| { |
| if (ds->ds_is_snapshot) { |
| return (dsl_dataset_phys(ds)->ds_unique_bytes); |
| } else { |
| dsl_dir_t *dd = ds->ds_dir; |
| mutex_enter(&dd->dd_lock); |
| uint64_t val = dsl_dir_get_used(dd); |
| mutex_exit(&dd->dd_lock); |
| return (val); |
| } |
| } |
| |
| uint64_t |
| dsl_get_creation(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_creation_time); |
| } |
| |
| uint64_t |
| dsl_get_creationtxg(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_creation_txg); |
| } |
| |
| uint64_t |
| dsl_get_refquota(dsl_dataset_t *ds) |
| { |
| return (ds->ds_quota); |
| } |
| |
| uint64_t |
| dsl_get_refreservation(dsl_dataset_t *ds) |
| { |
| return (ds->ds_reserved); |
| } |
| |
| uint64_t |
| dsl_get_guid(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_guid); |
| } |
| |
| uint64_t |
| dsl_get_unique(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_unique_bytes); |
| } |
| |
| uint64_t |
| dsl_get_objsetid(dsl_dataset_t *ds) |
| { |
| return (ds->ds_object); |
| } |
| |
| uint64_t |
| dsl_get_userrefs(dsl_dataset_t *ds) |
| { |
| return (ds->ds_userrefs); |
| } |
| |
| uint64_t |
| dsl_get_defer_destroy(dsl_dataset_t *ds) |
| { |
| return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); |
| } |
| |
| uint64_t |
| dsl_get_referenced(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_phys(ds)->ds_referenced_bytes); |
| } |
| |
| uint64_t |
| dsl_get_numclones(dsl_dataset_t *ds) |
| { |
| ASSERT(ds->ds_is_snapshot); |
| return (dsl_dataset_phys(ds)->ds_num_children - 1); |
| } |
| |
| uint64_t |
| dsl_get_inconsistent(dsl_dataset_t *ds) |
| { |
| return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? |
| 1 : 0); |
| } |
| |
| uint64_t |
| dsl_get_available(dsl_dataset_t *ds) |
| { |
| uint64_t refdbytes = dsl_get_referenced(ds); |
| uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, |
| NULL, 0, TRUE); |
| if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { |
| availbytes += |
| ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; |
| } |
| if (ds->ds_quota != 0) { |
| /* |
| * Adjust available bytes according to refquota |
| */ |
| if (refdbytes < ds->ds_quota) { |
| availbytes = MIN(availbytes, |
| ds->ds_quota - refdbytes); |
| } else { |
| availbytes = 0; |
| } |
| } |
| return (availbytes); |
| } |
| |
| int |
| dsl_get_written(dsl_dataset_t *ds, uint64_t *written) |
| { |
| 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) { |
| uint64_t comp, uncomp; |
| err = dsl_dataset_space_written(prev, ds, written, |
| &comp, &uncomp); |
| dsl_dataset_rele(prev, FTAG); |
| } |
| return (err); |
| } |
| |
| /* |
| * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. |
| */ |
| int |
| dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) |
| { |
| dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { |
| dsl_dataset_name(ds->ds_prev, snap); |
| return (0); |
| } else { |
| return (ENOENT); |
| } |
| } |
| |
| /* |
| * Returns the mountpoint property and source for the given dataset in the value |
| * and source buffers. The value buffer must be at least as large as MAXPATHLEN |
| * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. |
| * Returns 0 on success and an error on failure. |
| */ |
| int |
| dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, |
| char *source) |
| { |
| int error; |
| dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| |
| /* Retrieve the mountpoint value stored in the zap object */ |
| error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, |
| ZAP_MAXVALUELEN, value, source); |
| if (error != 0) { |
| return (error); |
| } |
| |
| /* |
| * Process the dsname and source to find the full mountpoint string. |
| * Can be skipped for 'legacy' or 'none'. |
| */ |
| if (value[0] == '/') { |
| char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); |
| char *root = buf; |
| const char *relpath; |
| |
| /* |
| * If we inherit the mountpoint, even from a dataset |
| * with a received value, the source will be the path of |
| * the dataset we inherit from. If source is |
| * ZPROP_SOURCE_VAL_RECVD, the received value is not |
| * inherited. |
| */ |
| if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { |
| relpath = ""; |
| } else { |
| ASSERT0(strncmp(dsname, source, strlen(source))); |
| relpath = dsname + strlen(source); |
| if (relpath[0] == '/') |
| relpath++; |
| } |
| |
| spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); |
| |
| /* |
| * Special case an alternate root of '/'. This will |
| * avoid having multiple leading slashes in the |
| * mountpoint path. |
| */ |
| if (strcmp(root, "/") == 0) |
| root++; |
| |
| /* |
| * If the mountpoint is '/' then skip over this |
| * if we are obtaining either an alternate root or |
| * an inherited mountpoint. |
| */ |
| char *mnt = value; |
| if (value[1] == '\0' && (root[0] != '\0' || |
| relpath[0] != '\0')) |
| mnt = value + 1; |
| |
| if (relpath[0] == '\0') { |
| (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", |
| root, mnt); |
| } else { |
| (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", |
| root, mnt, relpath[0] == '@' ? "" : "/", |
| relpath); |
| } |
| kmem_free(buf, ZAP_MAXVALUELEN); |
| } |
| |
| return (0); |
| } |
| |
| void |
| dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) |
| { |
| dsl_pool_t *dp = ds->ds_dir->dd_pool; |
| |
| ASSERT(dsl_pool_config_held(dp)); |
| |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, |
| dsl_get_refratio(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, |
| dsl_get_logicalreferenced(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, |
| dsl_get_compressratio(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, |
| dsl_get_used(ds)); |
| |
| if (ds->ds_is_snapshot) { |
| get_clones_stat(ds, nv); |
| } else { |
| char buf[ZFS_MAX_DATASET_NAME_LEN]; |
| if (dsl_get_prev_snap(ds, buf) == 0) |
| dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, |
| buf); |
| dsl_dir_stats(ds->ds_dir, nv); |
| } |
| |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, |
| dsl_get_available(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, |
| dsl_get_referenced(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, |
| dsl_get_creation(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, |
| dsl_get_creationtxg(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, |
| dsl_get_refquota(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, |
| dsl_get_refreservation(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, |
| dsl_get_guid(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, |
| dsl_get_unique(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, |
| dsl_get_objsetid(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, |
| dsl_get_userrefs(ds)); |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, |
| dsl_get_defer_destroy(ds)); |
| dsl_dataset_crypt_stats(ds, nv); |
| |
| if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
| uint64_t written; |
| if (dsl_get_written(ds, &written) == 0) { |
| dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, |
| written); |
| } |
| } |
| |
| if (!dsl_dataset_is_snapshot(ds)) { |
| /* |
| * A failed "newfs" (e.g. full) resumable receive leaves |
| * the stats set on this dataset. Check here for the prop. |
| */ |
| get_receive_resume_stats(ds, nv); |
| |
| /* |
| * A failed incremental resumable receive leaves the |
| * stats set on our child named "%recv". Check the child |
| * for the prop. |
| */ |
| /* 6 extra bytes for /%recv */ |
| char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; |
| dsl_dataset_t *recv_ds; |
| dsl_dataset_name(ds, recvname); |
| if (strlcat(recvname, "/", sizeof (recvname)) < |
| sizeof (recvname) && |
| strlcat(recvname, recv_clone_name, sizeof (recvname)) < |
| sizeof (recvname) && |
| dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { |
| get_receive_resume_stats(recv_ds, nv); |
| dsl_dataset_rele(recv_ds, FTAG); |
| } |
| } |
| } |
| |
| void |
| dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) |
| { |
| ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool); |
| ASSERT(dsl_pool_config_held(dp)); |
| |
| stat->dds_creation_txg = dsl_get_creationtxg(ds); |
| stat->dds_inconsistent = dsl_get_inconsistent(ds); |
| stat->dds_guid = dsl_get_guid(ds); |
| stat->dds_origin[0] = '\0'; |
| if (ds->ds_is_snapshot) { |
| stat->dds_is_snapshot = B_TRUE; |
| stat->dds_num_clones = dsl_get_numclones(ds); |
| } else { |
| stat->dds_is_snapshot = B_FALSE; |
| stat->dds_num_clones = 0; |
| |
| if (dsl_dir_is_clone(ds->ds_dir)) { |
| dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); |
| } |
| } |
| } |
| |
| 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; |
| } |
| rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
| *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); |
| rrw_exit(&ds->ds_bp_rwlock, FTAG); |
| *availobjsp = DN_MAX_OBJECT - *usedobjsp; |
| } |
| |
| boolean_t |
| dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) |
| { |
| ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool); |
| uint64_t birth; |
| |
| ASSERT(dsl_pool_config_held(dp)); |
| if (snap == NULL) |
| return (B_FALSE); |
| rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
| birth = dsl_dataset_get_blkptr(ds)->blk_birth; |
| rrw_exit(&ds->ds_bp_rwlock, FTAG); |
| if (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) >= ZFS_MAX_DATASET_NAME_LEN) |
| 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) |
| { |
| 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) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, |
| sizeof (ds->ds_snapname)); |
| 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)); |
| zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, |
| ddrsa->ddrsa_newsnapname, B_TRUE); |
| |
| 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 = NULL; |
| |
| 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); |
| } |
| |
| 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 (ds->ds_is_snapshot) { |
| 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(ESRCH)); |
| } |
| |
| /* |
| * No rollback to a snapshot created in the current txg, because |
| * the rollback may dirty the dataset and create blocks that are |
| * not reachable from the rootbp while having a birth txg that |
| * falls into the snapshot's range. |
| */ |
| if (dmu_tx_is_syncing(tx) && |
| dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { |
| dsl_dataset_rele(ds, FTAG); |
| return (SET_ERROR(EAGAIN)); |
| } |
| |
| /* |
| * If the expected target snapshot is specified, then check that |
| * the latest snapshot is it. |
| */ |
| if (ddra->ddra_tosnap != NULL) { |
| dsl_dataset_t *snapds; |
| |
| /* Check if the target snapshot exists at all. */ |
| error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); |
| if (error != 0) { |
| /* |
| * ESRCH is used to signal that the target snapshot does |
| * not exist, while ENOENT is used to report that |
| * the rolled back dataset does not exist. |
| * ESRCH is also used to cover other cases where the |
| * target snapshot is not related to the dataset being |
| * rolled back such as being in a different pool. |
| */ |
| if (error == ENOENT || error == EXDEV) |
| error = SET_ERROR(ESRCH); |
| dsl_dataset_rele(ds, FTAG); |
| return (error); |
| } |
| ASSERT(snapds->ds_is_snapshot); |
| |
| /* Check if the snapshot is the latest snapshot indeed. */ |
| if (snapds != ds->ds_prev) { |
| /* |
| * Distinguish between the case where the only problem |
| * is intervening snapshots (EEXIST) vs the snapshot |
| * not being a valid target for rollback (ESRCH). |
| */ |
| if (snapds->ds_dir == ds->ds_dir || |
| (dsl_dir_is_clone(ds->ds_dir) && |
| dsl_dir_phys(ds->ds_dir)->dd_origin_obj == |
| snapds->ds_object)) { |
| error = SET_ERROR(EEXIST); |
| } else { |
| error = SET_ERROR(ESRCH); |
| } |
| dsl_dataset_rele(snapds, FTAG); |
| dsl_dataset_rele(ds, FTAG); |
| return (error); |
| } |
| dsl_dataset_rele(snapds, FTAG); |
| } |
| |
| /* 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) { |
| dsl_dataset_rele(ds, FTAG); |
| 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); |
| } |
| |
| 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_MAX_DATASET_NAME_LEN]; |
| |
| 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, NULL, 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, const char *tosnap, void *owner, |
| nvlist_t *result) |
| { |
| dsl_dataset_rollback_arg_t ddra; |
| |
| ddra.ddra_fsname = fsname; |
| ddra.ddra_tosnap = tosnap; |
| 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; |
| }; |
| |
| 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); |
| |
| 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; |
| size_t max_snap_len; |
| boolean_t conflicting_snaps; |
| |
| err = promote_hold(ddpa, dp, FTAG); |
| if (err != 0) |
| return (err); |
| |
| hds = ddpa->ddpa_clone; |
| max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; |
| |
| if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { |
| promote_rele(ddpa, FTAG); |
| return (SET_ERROR(EXDEV)); |
| } |
| |
| snap = list_head(&ddpa->shared_snaps); |
| if (snap == NULL) { |
| err = SET_ERROR(ENOENT); |
| goto out; |
| } |
| origin_ds = snap->ds; |
| |
| /* |
| * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. |
| * When doing a promote we must make sure the encryption root for |
| * both the target and the target's origin does not change to avoid |
| * needing to rewrap encryption keys |
| */ |
| err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); |
| if (err != 0) |
| goto out; |
| |
| /* |
| * 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); |
| } |
| |
| /* compute origin's new unique space */ |
| snap = list_tail(&ddpa->clone_snaps); |
| ASSERT(snap != NULL); |
| 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 |
| */ |
| conflicting_snaps = B_FALSE; |
| 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)); |
| if (strlen(ds->ds_snapname) >= max_snap_len) { |
| err = SET_ERROR(ENAMETOOLONG); |
| goto out; |
| } |
| err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); |
| if (err == 0) { |
| fnvlist_add_boolean(ddpa->err_ds, |
| snap->ds->ds_snapname); |
| conflicting_snaps = B_TRUE; |
| } else 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; |
| } |
| |
| /* |
| * In order to return the full list of conflicting snapshots, we check |
| * whether there was a conflict after traversing all of them. |
| */ |
| if (conflicting_snaps) { |
| err = SET_ERROR(EEXIST); |
| goto out; |
| } |
| |
| /* |
| * 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); |
| if (snap == NULL) { |
| err = SET_ERROR(ENOENT); |
| goto out; |
| } |
| 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); |
| } |
| |
| 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; |
| |
| 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)); |
| |
| dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); |
| |
| /* 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)); |
| } |
| |
| /* 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)); |
| |
| /* 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)); |
| } |
| |
| /* |
| * 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 (ddpa->ddpa_clone->ds_is_snapshot || |
| !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 ZFS_MAX_DATASET_NAME_LEN bytes long.) |
| */ |
| int |
| dsl_dataset_promote(const char *name, char *conflsnap) |
| { |
| dsl_dataset_promote_arg_t ddpa = { 0 }; |
| uint64_t numsnaps; |
| int error; |
| nvpair_t *snap_pair; |
| 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 = fnvlist_alloc(); |
| ddpa.cr = CRED(); |
| |
| error = dsl_sync_task(name, dsl_dataset_promote_check, |
| dsl_dataset_promote_sync, &ddpa, |
| 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); |
| |
| /* |
| * Return the first conflicting snapshot found. |
| */ |
| snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); |
| if (snap_pair != NULL && conflsnap != NULL) |
| (void) strlcpy(conflsnap, nvpair_name(snap_pair), |
| ZFS_MAX_DATASET_NAME_LEN); |
| |
| fnvlist_free(ddpa.err_ds); |
| return (error); |
| } |
| |
| 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) |
| { |
| /* |
| * "slack" factor for received datasets with refquota set on them. |
| * See the bottom of this function for details on its use. |
| */ |
| uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * |
| spa_asize_inflation; |
| int64_t unused_refres_delta; |
| |
| /* they should both be heads */ |
| if (clone->ds_is_snapshot || |
| origin_head->ds_is_snapshot) |
| 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)); |
| |
| /* |
| * The clone can't be too much over the head's refquota. |
| * |
| * To ensure that the entire refquota can be used, we allow one |
| * transaction to exceed the refquota. Therefore, this check |
| * needs to also allow for the space referenced to be more than the |
| * refquota. The maximum amount of space that one transaction can use |
| * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this |
| * overage ensures that we are able to receive a filesystem that |
| * exceeds the refquota on the source system. |
| * |
| * So that overage is the refquota_slack we use below. |
| */ |
| if (origin_head->ds_quota != 0 && |
| dsl_dataset_phys(clone)->ds_referenced_bytes > |
| origin_head->ds_quota + refquota_slack) |
| return (SET_ERROR(EDQUOT)); |
| |
| return (0); |
| } |
| |
| static void |
| dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, |
| dsl_dataset_t *origin, dmu_tx_t *tx) |
| { |
| uint64_t clone_remap_dl_obj, origin_remap_dl_obj; |
| dsl_pool_t *dp = dmu_tx_pool(tx); |
| |
| ASSERT(dsl_pool_sync_context(dp)); |
| |
| clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); |
| origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); |
| |
| if (clone_remap_dl_obj != 0) { |
| dsl_deadlist_close(&clone->ds_remap_deadlist); |
| dsl_dataset_unset_remap_deadlist_object(clone, tx); |
| } |
| if (origin_remap_dl_obj != 0) { |
| dsl_deadlist_close(&origin->ds_remap_deadlist); |
| dsl_dataset_unset_remap_deadlist_object(origin, tx); |
| } |
| |
| if (clone_remap_dl_obj != 0) { |
| dsl_dataset_set_remap_deadlist_object(origin, |
| clone_remap_dl_obj, tx); |
| dsl_deadlist_open(&origin->ds_remap_deadlist, |
| dp->dp_meta_objset, clone_remap_dl_obj); |
| } |
| if (origin_remap_dl_obj != 0) { |
| dsl_dataset_set_remap_deadlist_object(clone, |
| origin_remap_dl_obj, tx); |
| dsl_deadlist_open(&clone->ds_remap_deadlist, |
| dp->dp_meta_objset, origin_remap_dl_obj); |
| } |
| } |
| |
| 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); |
| /* |
| * NOTE: On DEBUG kernels there could be a race between this and |
| * the check function if spa_asize_inflation is adjusted... |
| */ |
| ASSERT(origin_head->ds_quota == 0 || |
| dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + |
| DMU_MAX_ACCESS * spa_asize_inflation); |
| ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); |
| |
| /* |
| * Swap per-dataset feature flags. |
| */ |
| for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { |
| if (!(spa_feature_table[f].fi_flags & |
| ZFEATURE_FLAG_PER_DATASET)) { |
| ASSERT(!dsl_dataset_feature_is_active(clone, f)); |
| ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); |
| continue; |
| } |
| |
| boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); |
| void *clone_feature = clone->ds_feature[f]; |
| boolean_t origin_head_inuse = |
| dsl_dataset_feature_is_active(origin_head, f); |
| void *origin_head_feature = origin_head->ds_feature[f]; |
| |
| if (clone_inuse) |
| dsl_dataset_deactivate_feature_impl(clone, f, tx); |
| if (origin_head_inuse) |
| dsl_dataset_deactivate_feature_impl(origin_head, f, tx); |
| |
| if (clone_inuse) { |
| dsl_dataset_activate_feature(origin_head->ds_object, f, |
| clone_feature, tx); |
| origin_head->ds_feature[f] = clone_feature; |
| } |
| if (origin_head_inuse) { |
| dsl_dataset_activate_feature(clone->ds_object, f, |
| origin_head_feature, tx); |
| clone->ds_feature[f] = origin_head_feature; |
| } |
| } |
| |
| 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 */ |
| { |
| rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); |
| rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); |
| 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; |
| rrw_exit(&origin_head->ds_bp_rwlock, FTAG); |
| rrw_exit(&clone->ds_bp_rwlock, FTAG); |
| } |
| |
| /* 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); |
| } |
| |
| /* 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_dataset_swap_remap_deadlists(clone, origin_head, tx); |
| |
| 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 (ds->ds_is_snapshot) { |
| 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 = NULL; |
| 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_EXTRA_RESERVED)); |
| } |
| |
| 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 (ds->ds_is_snapshot) { |
| 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 = NULL; |
| |
| 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_EXTRA_RESERVED)); |
| } |
| |
| /* |
| * 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(firstsnap->ds_is_snapshot); |
| ASSERT(lastsnap->ds_is_snapshot); |
| |
| /* |
| * 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); |
| } |
| |
| /* |
| * 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(earlier->ds_is_snapshot || earlier_txg != 0); |
| |
| if (earlier_txg == 0) |
| earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; |
| |
| if (later->ds_is_snapshot && |
| 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); |
| } |
| |
| boolean_t |
| dsl_dataset_is_zapified(dsl_dataset_t *ds) |
| { |
| dmu_object_info_t doi; |
| |
| dmu_object_info_from_db(ds->ds_dbuf, &doi); |
| return (doi.doi_type == DMU_OTN_ZAP_METADATA); |
| } |
| |
| boolean_t |
| dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) |
| { |
| return (dsl_dataset_is_zapified(ds) && |
| zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, |
| ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); |
| } |
| |
| uint64_t |
| dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) |
| { |
| uint64_t remap_deadlist_obj; |
| int err; |
| |
| if (!dsl_dataset_is_zapified(ds)) |
| return (0); |
| |
| err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, |
| DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, |
| &remap_deadlist_obj); |
| |
| if (err != 0) { |
| VERIFY3S(err, ==, ENOENT); |
| return (0); |
| } |
| |
| ASSERT(remap_deadlist_obj != 0); |
| return (remap_deadlist_obj); |
| } |
| |
| boolean_t |
| dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) |
| { |
| EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), |
| dsl_dataset_get_remap_deadlist_object(ds) != 0); |
| return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); |
| } |
| |
| static void |
| dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, |
| dmu_tx_t *tx) |
| { |
| ASSERT(obj != 0); |
| dsl_dataset_zapify(ds, tx); |
| VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, |
| DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); |
| } |
| |
| static void |
| dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) |
| { |
| VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, |
| ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); |
| } |
| |
| void |
| dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) |
| { |
| uint64_t remap_deadlist_object; |
| spa_t *spa = ds->ds_dir->dd_pool->dp_spa; |
| |
| ASSERT(dmu_tx_is_syncing(tx)); |
| ASSERT(dsl_dataset_remap_deadlist_exists(ds)); |
| |
| remap_deadlist_object = ds->ds_remap_deadlist.dl_object; |
| dsl_deadlist_close(&ds->ds_remap_deadlist); |
| dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); |
| dsl_dataset_unset_remap_deadlist_object(ds, tx); |
| spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); |
| } |
| |
| void |
| dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) |
| { |
| uint64_t remap_deadlist_obj; |
| spa_t *spa = ds->ds_dir->dd_pool->dp_spa; |
| |
| ASSERT(dmu_tx_is_syncing(tx)); |
| ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); |
| /* |
| * Currently we only create remap deadlists when there are indirect |
| * vdevs with referenced mappings. |
| */ |
| ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); |
| |
| remap_deadlist_obj = dsl_deadlist_clone( |
| &ds->ds_deadlist, UINT64_MAX, |
| dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); |
| dsl_dataset_set_remap_deadlist_object(ds, |
| remap_deadlist_obj, tx); |
| dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), |
| remap_deadlist_obj); |
| spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); |
| } |
| |
| #if defined(_KERNEL) |
| #if defined(_LP64) |
| module_param(zfs_max_recordsize, int, 0644); |
| MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size"); |
| #else |
| /* Limited to 1M on 32-bit platforms due to lack of virtual address space */ |
| module_param(zfs_max_recordsize, int, 0444); |
| MODULE_PARM_DESC(zfs_max_recordsize, "Max allowed record size"); |
| #endif |
| |
| EXPORT_SYMBOL(dsl_dataset_hold); |
| EXPORT_SYMBOL(dsl_dataset_hold_flags); |
| EXPORT_SYMBOL(dsl_dataset_hold_obj); |
| EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); |
| EXPORT_SYMBOL(dsl_dataset_own); |
| EXPORT_SYMBOL(dsl_dataset_own_obj); |
| EXPORT_SYMBOL(dsl_dataset_name); |
| EXPORT_SYMBOL(dsl_dataset_rele); |
| EXPORT_SYMBOL(dsl_dataset_rele_flags); |
| EXPORT_SYMBOL(dsl_dataset_disown); |
| EXPORT_SYMBOL(dsl_dataset_tryown); |
| EXPORT_SYMBOL(dsl_dataset_create_sync); |
| EXPORT_SYMBOL(dsl_dataset_create_sync_dd); |
| EXPORT_SYMBOL(dsl_dataset_snapshot_check); |
| EXPORT_SYMBOL(dsl_dataset_snapshot_sync); |
| EXPORT_SYMBOL(dsl_dataset_promote); |
| EXPORT_SYMBOL(dsl_dataset_user_hold); |
| EXPORT_SYMBOL(dsl_dataset_user_release); |
| EXPORT_SYMBOL(dsl_dataset_get_holds); |
| EXPORT_SYMBOL(dsl_dataset_get_blkptr); |
| EXPORT_SYMBOL(dsl_dataset_get_spa); |
| EXPORT_SYMBOL(dsl_dataset_modified_since_snap); |
| EXPORT_SYMBOL(dsl_dataset_space_written); |
| EXPORT_SYMBOL(dsl_dataset_space_wouldfree); |
| EXPORT_SYMBOL(dsl_dataset_sync); |
| EXPORT_SYMBOL(dsl_dataset_block_born); |
| EXPORT_SYMBOL(dsl_dataset_block_kill); |
| EXPORT_SYMBOL(dsl_dataset_dirty); |
| EXPORT_SYMBOL(dsl_dataset_stats); |
| EXPORT_SYMBOL(dsl_dataset_fast_stat); |
| EXPORT_SYMBOL(dsl_dataset_space); |
| EXPORT_SYMBOL(dsl_dataset_fsid_guid); |
| EXPORT_SYMBOL(dsl_dsobj_to_dsname); |
| EXPORT_SYMBOL(dsl_dataset_check_quota); |
| EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); |
| EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); |
| #endif |