4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2020 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 RackTop Systems.
27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 * Copyright (c) 2016 Actifio, Inc. All rights reserved.
29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
30 * Copyright 2017 Nexenta Systems, Inc.
31 * Copyright (c) 2019, Klara Inc.
32 * Copyright (c) 2019, Allan Jude
33 * Copyright (c) 2020 The FreeBSD Foundation [1]
35 * [1] Portions of this software were developed by Allan Jude
36 * under sponsorship from the FreeBSD Foundation.
39 #include <sys/dmu_objset.h>
40 #include <sys/dsl_dataset.h>
41 #include <sys/dsl_dir.h>
42 #include <sys/dsl_prop.h>
43 #include <sys/dsl_synctask.h>
44 #include <sys/dmu_traverse.h>
45 #include <sys/dmu_impl.h>
46 #include <sys/dmu_tx.h>
50 #include <sys/zfeature.h>
51 #include <sys/unique.h>
52 #include <sys/zfs_context.h>
53 #include <sys/zfs_ioctl.h>
55 #include <sys/spa_impl.h>
57 #include <sys/zfs_znode.h>
58 #include <sys/zfs_onexit.h>
60 #include <sys/dsl_scan.h>
61 #include <sys/dsl_deadlist.h>
62 #include <sys/dsl_destroy.h>
63 #include <sys/dsl_userhold.h>
64 #include <sys/dsl_bookmark.h>
65 #include <sys/policy.h>
66 #include <sys/dmu_send.h>
67 #include <sys/dmu_recv.h>
68 #include <sys/zio_compress.h>
69 #include <zfs_fletcher.h>
70 #include <sys/zio_checksum.h>
73 * The SPA supports block sizes up to 16MB. However, very large blocks
74 * can have an impact on i/o latency (e.g. tying up a spinning disk for
75 * ~300ms), and also potentially on the memory allocator. Therefore,
76 * we do not allow the recordsize to be set larger than zfs_max_recordsize
77 * (default 1MB). Larger blocks can be created by changing this tunable,
78 * and pools with larger blocks can always be imported and used, regardless
81 int zfs_max_recordsize = 1 * 1024 * 1024;
82 static int zfs_allow_redacted_dataset_mount = 0;
84 #define SWITCH64(x, y) \
86 uint64_t __tmp = (x); \
91 #define DS_REF_MAX (1ULL << 62)
93 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds,
94 uint64_t obj, dmu_tx_t *tx);
95 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds,
98 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f);
100 extern int spa_asize_inflation;
102 static zil_header_t zero_zil;
105 * Figure out how much of this delta should be propagated to the dsl_dir
106 * layer. If there's a refreservation, that space has already been
107 * partially accounted for in our ancestors.
110 parent_delta(dsl_dataset_t *ds, int64_t delta)
112 dsl_dataset_phys_t *ds_phys;
113 uint64_t old_bytes, new_bytes;
115 if (ds->ds_reserved == 0)
118 ds_phys = dsl_dataset_phys(ds);
119 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
120 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
122 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
123 return (new_bytes - old_bytes);
127 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
129 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
130 int used = bp_get_dsize_sync(spa, bp);
131 int compressed = BP_GET_PSIZE(bp);
132 int uncompressed = BP_GET_UCSIZE(bp);
136 dprintf_bp(bp, "ds=%p", ds);
138 ASSERT(dmu_tx_is_syncing(tx));
139 /* It could have been compressed away to nothing */
140 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp))
142 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
143 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
145 dsl_pool_mos_diduse_space(tx->tx_pool,
146 used, compressed, uncompressed);
150 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
151 dmu_buf_will_dirty(ds->ds_dbuf, tx);
152 mutex_enter(&ds->ds_lock);
153 delta = parent_delta(ds, used);
154 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
155 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
156 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
157 dsl_dataset_phys(ds)->ds_unique_bytes += used;
159 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
160 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] =
165 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
166 if (f != SPA_FEATURE_NONE) {
167 ASSERT3S(spa_feature_table[f].fi_type, ==,
168 ZFEATURE_TYPE_BOOLEAN);
169 ds->ds_feature_activation[f] = (void *)B_TRUE;
172 f = zio_compress_to_feature(BP_GET_COMPRESS(bp));
173 if (f != SPA_FEATURE_NONE) {
174 ASSERT3S(spa_feature_table[f].fi_type, ==,
175 ZFEATURE_TYPE_BOOLEAN);
176 ds->ds_feature_activation[f] = (void *)B_TRUE;
180 * Track block for livelist, but ignore embedded blocks because
181 * they do not need to be freed.
183 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
184 bp->blk_birth > ds->ds_dir->dd_origin_txg &&
185 !(BP_IS_EMBEDDED(bp))) {
186 ASSERT(dsl_dir_is_clone(ds->ds_dir));
187 ASSERT(spa_feature_is_enabled(spa,
188 SPA_FEATURE_LIVELIST));
189 bplist_append(&ds->ds_dir->dd_pending_allocs, bp);
192 mutex_exit(&ds->ds_lock);
193 dsl_dir_diduse_transfer_space(ds->ds_dir, delta,
194 compressed, uncompressed, used,
195 DD_USED_REFRSRV, DD_USED_HEAD, tx);
199 * Called when the specified segment has been remapped, and is thus no
200 * longer referenced in the head dataset. The vdev must be indirect.
202 * If the segment is referenced by a snapshot, put it on the remap deadlist.
203 * Otherwise, add this segment to the obsolete spacemap.
206 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset,
207 uint64_t size, uint64_t birth, dmu_tx_t *tx)
209 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
211 ASSERT(dmu_tx_is_syncing(tx));
212 ASSERT(birth <= tx->tx_txg);
213 ASSERT(!ds->ds_is_snapshot);
215 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
216 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
219 dva_t *dva = &fakebp.blk_dva[0];
223 mutex_enter(&ds->ds_remap_deadlist_lock);
224 if (!dsl_dataset_remap_deadlist_exists(ds)) {
225 dsl_dataset_create_remap_deadlist(ds, tx);
227 mutex_exit(&ds->ds_remap_deadlist_lock);
230 fakebp.blk_birth = birth;
231 DVA_SET_VDEV(dva, vdev);
232 DVA_SET_OFFSET(dva, offset);
233 DVA_SET_ASIZE(dva, size);
234 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE,
240 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
243 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
245 int used = bp_get_dsize_sync(spa, bp);
246 int compressed = BP_GET_PSIZE(bp);
247 int uncompressed = BP_GET_UCSIZE(bp);
249 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp))
252 ASSERT(dmu_tx_is_syncing(tx));
253 ASSERT(bp->blk_birth <= tx->tx_txg);
256 dsl_free(tx->tx_pool, tx->tx_txg, bp);
257 dsl_pool_mos_diduse_space(tx->tx_pool,
258 -used, -compressed, -uncompressed);
261 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
263 ASSERT(!ds->ds_is_snapshot);
264 dmu_buf_will_dirty(ds->ds_dbuf, tx);
267 * Track block for livelist, but ignore embedded blocks because
268 * they do not need to be freed.
270 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
271 bp->blk_birth > ds->ds_dir->dd_origin_txg &&
272 !(BP_IS_EMBEDDED(bp))) {
273 ASSERT(dsl_dir_is_clone(ds->ds_dir));
274 ASSERT(spa_feature_is_enabled(spa,
275 SPA_FEATURE_LIVELIST));
276 bplist_append(&ds->ds_dir->dd_pending_frees, bp);
279 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
282 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object);
283 dsl_free(tx->tx_pool, tx->tx_txg, bp);
285 mutex_enter(&ds->ds_lock);
286 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
287 !DS_UNIQUE_IS_ACCURATE(ds));
288 delta = parent_delta(ds, -used);
289 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
290 mutex_exit(&ds->ds_lock);
291 dsl_dir_diduse_transfer_space(ds->ds_dir,
292 delta, -compressed, -uncompressed, -used,
293 DD_USED_REFRSRV, DD_USED_HEAD, tx);
295 dprintf_bp(bp, "putting on dead list: %s", "");
298 * We are here as part of zio's write done callback,
299 * which means we're a zio interrupt thread. We can't
300 * call dsl_deadlist_insert() now because it may block
301 * waiting for I/O. Instead, put bp on the deferred
302 * queue and let dsl_pool_sync() finish the job.
304 bplist_append(&ds->ds_pending_deadlist, bp);
306 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx);
308 ASSERT3U(ds->ds_prev->ds_object, ==,
309 dsl_dataset_phys(ds)->ds_prev_snap_obj);
310 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
311 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
312 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
313 ds->ds_object && bp->blk_birth >
314 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
315 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
316 mutex_enter(&ds->ds_prev->ds_lock);
317 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
318 mutex_exit(&ds->ds_prev->ds_lock);
320 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
321 dsl_dir_transfer_space(ds->ds_dir, used,
322 DD_USED_HEAD, DD_USED_SNAP, tx);
326 dsl_bookmark_block_killed(ds, bp, tx);
328 mutex_enter(&ds->ds_lock);
329 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
330 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
331 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
332 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
333 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
334 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
335 mutex_exit(&ds->ds_lock);
340 struct feature_type_uint64_array_arg {
346 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f)
348 switch (spa_feature_table[f].fi_type) {
349 case ZFEATURE_TYPE_BOOLEAN:
351 case ZFEATURE_TYPE_UINT64_ARRAY:
353 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
354 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t));
355 kmem_free(ftuaa, sizeof (*ftuaa));
359 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
364 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f)
367 switch (spa_feature_table[f].fi_type) {
368 case ZFEATURE_TYPE_BOOLEAN:
369 err = zap_contains(mos, ds->ds_object,
370 spa_feature_table[f].fi_guid);
372 ds->ds_feature[f] = (void *)B_TRUE;
374 ASSERT3U(err, ==, ENOENT);
378 case ZFEATURE_TYPE_UINT64_ARRAY:
380 uint64_t int_size, num_int;
382 err = zap_length(mos, ds->ds_object,
383 spa_feature_table[f].fi_guid, &int_size, &num_int);
385 ASSERT3U(err, ==, ENOENT);
389 ASSERT3U(int_size, ==, sizeof (uint64_t));
390 data = kmem_alloc(int_size * num_int, KM_SLEEP);
391 VERIFY0(zap_lookup(mos, ds->ds_object,
392 spa_feature_table[f].fi_guid, int_size, num_int, data));
393 struct feature_type_uint64_array_arg *ftuaa =
394 kmem_alloc(sizeof (*ftuaa), KM_SLEEP);
395 ftuaa->length = num_int;
397 ds->ds_feature[f] = ftuaa;
401 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
407 * We have to release the fsid synchronously or we risk that a subsequent
408 * mount of the same dataset will fail to unique_insert the fsid. This
409 * failure would manifest itself as the fsid of this dataset changing
410 * between mounts which makes NFS clients quite unhappy.
413 dsl_dataset_evict_sync(void *dbu)
415 dsl_dataset_t *ds = dbu;
417 ASSERT(ds->ds_owner == NULL);
419 unique_remove(ds->ds_fsid_guid);
423 dsl_dataset_evict_async(void *dbu)
425 dsl_dataset_t *ds = dbu;
427 ASSERT(ds->ds_owner == NULL);
431 if (ds->ds_objset != NULL)
432 dmu_objset_evict(ds->ds_objset);
435 dsl_dataset_rele(ds->ds_prev, ds);
439 dsl_bookmark_fini_ds(ds);
441 bplist_destroy(&ds->ds_pending_deadlist);
442 if (dsl_deadlist_is_open(&ds->ds_deadlist))
443 dsl_deadlist_close(&ds->ds_deadlist);
444 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
445 dsl_deadlist_close(&ds->ds_remap_deadlist);
447 dsl_dir_async_rele(ds->ds_dir, ds);
449 ASSERT(!list_link_active(&ds->ds_synced_link));
451 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
452 if (dsl_dataset_feature_is_active(ds, f))
453 unload_zfeature(ds, f);
456 list_destroy(&ds->ds_prop_cbs);
457 mutex_destroy(&ds->ds_lock);
458 mutex_destroy(&ds->ds_opening_lock);
459 mutex_destroy(&ds->ds_sendstream_lock);
460 mutex_destroy(&ds->ds_remap_deadlist_lock);
461 zfs_refcount_destroy(&ds->ds_longholds);
462 rrw_destroy(&ds->ds_bp_rwlock);
464 kmem_free(ds, sizeof (dsl_dataset_t));
468 dsl_dataset_get_snapname(dsl_dataset_t *ds)
470 dsl_dataset_phys_t *headphys;
473 dsl_pool_t *dp = ds->ds_dir->dd_pool;
474 objset_t *mos = dp->dp_meta_objset;
476 if (ds->ds_snapname[0])
478 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
481 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
485 headphys = headdbuf->db_data;
486 err = zap_value_search(dp->dp_meta_objset,
487 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
488 if (err != 0 && zfs_recover == B_TRUE) {
490 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname),
491 "SNAPOBJ=%llu-ERR=%d",
492 (unsigned long long)ds->ds_object, err);
494 dmu_buf_rele(headdbuf, FTAG);
499 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
501 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
502 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
506 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
509 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
510 value, mt, NULL, 0, NULL);
511 if (err == ENOTSUP && (mt & MT_NORMALIZE))
512 err = zap_lookup(mos, snapobj, name, 8, 1, value);
517 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
520 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
521 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
525 dsl_dir_snap_cmtime_update(ds->ds_dir);
527 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
530 err = zap_remove_norm(mos, snapobj, name, mt, tx);
531 if (err == ENOTSUP && (mt & MT_NORMALIZE))
532 err = zap_remove(mos, snapobj, name, tx);
534 if (err == 0 && adj_cnt)
535 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
536 DD_FIELD_SNAPSHOT_COUNT, tx);
542 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
544 dmu_buf_t *dbuf = ds->ds_dbuf;
545 boolean_t result = B_FALSE;
547 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
548 ds->ds_object, DMU_BONUS_BLKID, tag)) {
550 if (ds == dmu_buf_get_user(dbuf))
553 dmu_buf_rele(dbuf, tag);
560 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
563 objset_t *mos = dp->dp_meta_objset;
567 dmu_object_info_t doi;
569 ASSERT(dsl_pool_config_held(dp));
571 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
575 /* Make sure dsobj has the correct object type. */
576 dmu_object_info_from_db(dbuf, &doi);
577 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
578 dmu_buf_rele(dbuf, tag);
579 return (SET_ERROR(EINVAL));
582 ds = dmu_buf_get_user(dbuf);
584 dsl_dataset_t *winner = NULL;
586 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
588 ds->ds_object = dsobj;
589 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
590 list_link_init(&ds->ds_synced_link);
592 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj,
593 NULL, ds, &ds->ds_dir);
595 kmem_free(ds, sizeof (dsl_dataset_t));
596 dmu_buf_rele(dbuf, tag);
600 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
601 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
602 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
603 mutex_init(&ds->ds_remap_deadlist_lock,
604 NULL, MUTEX_DEFAULT, NULL);
605 rrw_init(&ds->ds_bp_rwlock, B_FALSE);
606 zfs_refcount_create(&ds->ds_longholds);
608 bplist_create(&ds->ds_pending_deadlist);
610 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t),
611 offsetof(dmu_sendstatus_t, dss_link));
613 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
614 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
616 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
619 for (f = 0; f < SPA_FEATURES; f++) {
620 if (!(spa_feature_table[f].fi_flags &
621 ZFEATURE_FLAG_PER_DATASET))
623 err = load_zfeature(mos, ds, f);
627 if (!ds->ds_is_snapshot) {
628 ds->ds_snapname[0] = '\0';
629 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
630 err = dsl_dataset_hold_obj(dp,
631 dsl_dataset_phys(ds)->ds_prev_snap_obj,
634 err = dsl_bookmark_init_ds(ds);
636 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
637 err = dsl_dataset_get_snapname(ds);
639 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
641 ds->ds_dir->dd_pool->dp_meta_objset,
642 dsl_dataset_phys(ds)->ds_userrefs_obj,
647 if (err == 0 && !ds->ds_is_snapshot) {
648 err = dsl_prop_get_int_ds(ds,
649 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
652 err = dsl_prop_get_int_ds(ds,
653 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
657 ds->ds_reserved = ds->ds_quota = 0;
660 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 &&
661 ds->ds_is_snapshot &&
662 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) {
663 dp->dp_spa->spa_errata =
664 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION;
667 dsl_deadlist_open(&ds->ds_deadlist,
668 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
669 uint64_t remap_deadlist_obj =
670 dsl_dataset_get_remap_deadlist_object(ds);
671 if (remap_deadlist_obj != 0) {
672 dsl_deadlist_open(&ds->ds_remap_deadlist, mos,
676 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
677 dsl_dataset_evict_async, &ds->ds_dbuf);
679 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
681 if (err != 0 || winner != NULL) {
682 bplist_destroy(&ds->ds_pending_deadlist);
683 dsl_deadlist_close(&ds->ds_deadlist);
684 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
685 dsl_deadlist_close(&ds->ds_remap_deadlist);
686 dsl_bookmark_fini_ds(ds);
688 dsl_dataset_rele(ds->ds_prev, ds);
689 dsl_dir_rele(ds->ds_dir, ds);
690 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
691 if (dsl_dataset_feature_is_active(ds, f))
692 unload_zfeature(ds, f);
695 list_destroy(&ds->ds_prop_cbs);
696 list_destroy(&ds->ds_sendstreams);
697 mutex_destroy(&ds->ds_lock);
698 mutex_destroy(&ds->ds_opening_lock);
699 mutex_destroy(&ds->ds_sendstream_lock);
700 mutex_destroy(&ds->ds_remap_deadlist_lock);
701 zfs_refcount_destroy(&ds->ds_longholds);
702 rrw_destroy(&ds->ds_bp_rwlock);
703 kmem_free(ds, sizeof (dsl_dataset_t));
705 dmu_buf_rele(dbuf, tag);
711 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
712 if (ds->ds_fsid_guid !=
713 dsl_dataset_phys(ds)->ds_fsid_guid) {
714 zfs_dbgmsg("ds_fsid_guid changed from "
715 "%llx to %llx for pool %s dataset id %llu",
717 dsl_dataset_phys(ds)->ds_fsid_guid,
718 (long long)ds->ds_fsid_guid,
719 spa_name(dp->dp_spa),
720 (u_longlong_t)dsobj);
725 ASSERT3P(ds->ds_dbuf, ==, dbuf);
726 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
727 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
728 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
729 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
736 dsl_dataset_create_key_mapping(dsl_dataset_t *ds)
738 dsl_dir_t *dd = ds->ds_dir;
740 if (dd->dd_crypto_obj == 0)
743 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa,
744 ds, ds, &ds->ds_key_mapping));
748 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj,
749 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp)
753 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
757 ASSERT3P(*dsp, !=, NULL);
759 if (flags & DS_HOLD_FLAG_DECRYPT) {
760 err = dsl_dataset_create_key_mapping(*dsp);
762 dsl_dataset_rele(*dsp, tag);
769 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
770 void *tag, dsl_dataset_t **dsp)
773 const char *snapname;
778 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
782 ASSERT(dsl_pool_config_held(dp));
783 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
785 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds);
787 err = SET_ERROR(ENOENT);
789 /* we may be looking for a snapshot */
790 if (err == 0 && snapname != NULL) {
791 dsl_dataset_t *snap_ds;
793 if (*snapname++ != '@') {
794 dsl_dataset_rele_flags(ds, flags, tag);
795 dsl_dir_rele(dd, FTAG);
796 return (SET_ERROR(ENOENT));
799 dprintf("looking for snapshot '%s'\n", snapname);
800 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
802 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag,
805 dsl_dataset_rele_flags(ds, flags, tag);
808 mutex_enter(&snap_ds->ds_lock);
809 if (snap_ds->ds_snapname[0] == 0)
810 (void) strlcpy(snap_ds->ds_snapname, snapname,
811 sizeof (snap_ds->ds_snapname));
812 mutex_exit(&snap_ds->ds_lock);
818 dsl_dir_rele(dd, FTAG);
823 dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag,
826 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp));
830 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
831 void *tag, boolean_t override, dsl_dataset_t **dsp)
833 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp);
836 if (!dsl_dataset_tryown(*dsp, tag, override)) {
837 dsl_dataset_rele_flags(*dsp, flags, tag);
839 return (SET_ERROR(EBUSY));
846 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags,
847 void *tag, dsl_dataset_t **dsp)
849 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp));
853 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj,
854 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp)
856 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp));
860 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
861 void *tag, boolean_t override, dsl_dataset_t **dsp)
863 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp);
866 if (!dsl_dataset_tryown(*dsp, tag, override)) {
867 dsl_dataset_rele_flags(*dsp, flags, tag);
868 return (SET_ERROR(EBUSY));
874 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
875 void *tag, dsl_dataset_t **dsp)
877 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp));
881 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags,
882 void *tag, dsl_dataset_t **dsp)
884 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp));
888 * See the comment above dsl_pool_hold() for details. In summary, a long
889 * hold is used to prevent destruction of a dataset while the pool hold
890 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
892 * The dataset and pool must be held when this function is called. After it
893 * is called, the pool hold may be released while the dataset is still held
897 dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag)
899 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
900 (void) zfs_refcount_add(&ds->ds_longholds, tag);
904 dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag)
906 (void) zfs_refcount_remove(&ds->ds_longholds, tag);
909 /* Return B_TRUE if there are any long holds on this dataset. */
911 dsl_dataset_long_held(dsl_dataset_t *ds)
913 return (!zfs_refcount_is_zero(&ds->ds_longholds));
917 dsl_dataset_name(dsl_dataset_t *ds, char *name)
920 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN);
922 dsl_dir_name(ds->ds_dir, name);
923 VERIFY0(dsl_dataset_get_snapname(ds));
924 if (ds->ds_snapname[0]) {
925 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
926 <, ZFS_MAX_DATASET_NAME_LEN);
928 * We use a "recursive" mutex so that we
929 * can call dprintf_ds() with ds_lock held.
931 if (!MUTEX_HELD(&ds->ds_lock)) {
932 mutex_enter(&ds->ds_lock);
933 VERIFY3U(strlcat(name, ds->ds_snapname,
934 ZFS_MAX_DATASET_NAME_LEN), <,
935 ZFS_MAX_DATASET_NAME_LEN);
936 mutex_exit(&ds->ds_lock);
938 VERIFY3U(strlcat(name, ds->ds_snapname,
939 ZFS_MAX_DATASET_NAME_LEN), <,
940 ZFS_MAX_DATASET_NAME_LEN);
947 dsl_dataset_namelen(dsl_dataset_t *ds)
949 VERIFY0(dsl_dataset_get_snapname(ds));
950 mutex_enter(&ds->ds_lock);
951 int len = strlen(ds->ds_snapname);
952 mutex_exit(&ds->ds_lock);
953 /* add '@' if ds is a snap */
956 len += dsl_dir_namelen(ds->ds_dir);
961 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
963 dmu_buf_rele(ds->ds_dbuf, tag);
967 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds)
969 dsl_dir_t *dd = ds->ds_dir;
971 if (dd == NULL || dd->dd_crypto_obj == 0)
974 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa,
979 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag)
981 if (flags & DS_HOLD_FLAG_DECRYPT)
982 dsl_dataset_remove_key_mapping(ds);
984 dsl_dataset_rele(ds, tag);
988 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag)
990 ASSERT3P(ds->ds_owner, ==, tag);
991 ASSERT(ds->ds_dbuf != NULL);
993 mutex_enter(&ds->ds_lock);
995 mutex_exit(&ds->ds_lock);
996 dsl_dataset_long_rele(ds, tag);
997 dsl_dataset_rele_flags(ds, flags, tag);
1001 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag, boolean_t override)
1003 boolean_t gotit = FALSE;
1005 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1006 mutex_enter(&ds->ds_lock);
1007 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) ||
1008 (dsl_dataset_feature_is_active(ds,
1009 SPA_FEATURE_REDACTED_DATASETS) &&
1010 !zfs_allow_redacted_dataset_mount)))) {
1012 dsl_dataset_long_hold(ds, tag);
1015 mutex_exit(&ds->ds_lock);
1020 dsl_dataset_has_owner(dsl_dataset_t *ds)
1023 mutex_enter(&ds->ds_lock);
1024 rv = (ds->ds_owner != NULL);
1025 mutex_exit(&ds->ds_lock);
1030 zfeature_active(spa_feature_t f, void *arg)
1032 switch (spa_feature_table[f].fi_type) {
1033 case ZFEATURE_TYPE_BOOLEAN: {
1034 boolean_t val = (boolean_t)(uintptr_t)arg;
1035 ASSERT(val == B_FALSE || val == B_TRUE);
1038 case ZFEATURE_TYPE_UINT64_ARRAY:
1040 * In this case, arg is a uint64_t array. The feature is active
1041 * if the array is non-null.
1043 return (arg != NULL);
1045 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
1051 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f)
1053 return (zfeature_active(f, ds->ds_feature[f]));
1057 * The buffers passed out by this function are references to internal buffers;
1058 * they should not be freed by callers of this function, and they should not be
1059 * used after the dataset has been released.
1062 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f,
1063 uint64_t *outlength, uint64_t **outp)
1065 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY);
1066 if (!dsl_dataset_feature_is_active(ds, f)) {
1069 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f];
1070 *outp = ftuaa->array;
1071 *outlength = ftuaa->length;
1076 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg,
1079 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1080 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
1083 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
1085 spa_feature_incr(spa, f, tx);
1086 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
1088 switch (spa_feature_table[f].fi_type) {
1089 case ZFEATURE_TYPE_BOOLEAN:
1090 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE);
1091 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
1092 sizeof (zero), 1, &zero, tx));
1094 case ZFEATURE_TYPE_UINT64_ARRAY:
1096 struct feature_type_uint64_array_arg *ftuaa = arg;
1097 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
1098 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx));
1102 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type);
1107 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f,
1110 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
1111 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
1112 uint64_t dsobj = ds->ds_object;
1114 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
1116 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
1117 spa_feature_decr(spa, f, tx);
1118 ds->ds_feature[f] = NULL;
1122 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx)
1124 unload_zfeature(ds, f);
1125 dsl_dataset_deactivate_feature_impl(ds, f, tx);
1129 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
1130 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx)
1132 dsl_pool_t *dp = dd->dd_pool;
1134 dsl_dataset_phys_t *dsphys;
1136 objset_t *mos = dp->dp_meta_objset;
1139 origin = dp->dp_origin_snap;
1141 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
1142 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
1143 ASSERT(dmu_tx_is_syncing(tx));
1144 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
1146 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1147 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1148 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1149 dmu_buf_will_dirty(dbuf, tx);
1150 dsphys = dbuf->db_data;
1151 memset(dsphys, 0, sizeof (dsl_dataset_phys_t));
1152 dsphys->ds_dir_obj = dd->dd_object;
1153 dsphys->ds_flags = flags;
1154 dsphys->ds_fsid_guid = unique_create();
1155 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1156 sizeof (dsphys->ds_guid));
1157 dsphys->ds_snapnames_zapobj =
1158 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
1159 DMU_OT_NONE, 0, tx);
1160 dsphys->ds_creation_time = gethrestime_sec();
1161 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
1163 if (origin == NULL) {
1164 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
1166 dsl_dataset_t *ohds; /* head of the origin snapshot */
1168 dsphys->ds_prev_snap_obj = origin->ds_object;
1169 dsphys->ds_prev_snap_txg =
1170 dsl_dataset_phys(origin)->ds_creation_txg;
1171 dsphys->ds_referenced_bytes =
1172 dsl_dataset_phys(origin)->ds_referenced_bytes;
1173 dsphys->ds_compressed_bytes =
1174 dsl_dataset_phys(origin)->ds_compressed_bytes;
1175 dsphys->ds_uncompressed_bytes =
1176 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
1177 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
1178 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
1179 rrw_exit(&origin->ds_bp_rwlock, FTAG);
1182 * Inherit flags that describe the dataset's contents
1183 * (INCONSISTENT) or properties (Case Insensitive).
1185 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
1186 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
1188 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1189 if (zfeature_active(f, origin->ds_feature[f])) {
1190 dsl_dataset_activate_feature(dsobj, f,
1191 origin->ds_feature[f], tx);
1195 dmu_buf_will_dirty(origin->ds_dbuf, tx);
1196 dsl_dataset_phys(origin)->ds_num_children++;
1198 VERIFY0(dsl_dataset_hold_obj(dp,
1199 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
1201 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
1202 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
1203 dsl_dataset_rele(ohds, FTAG);
1205 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
1206 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
1207 dsl_dataset_phys(origin)->ds_next_clones_obj =
1209 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
1211 VERIFY0(zap_add_int(mos,
1212 dsl_dataset_phys(origin)->ds_next_clones_obj,
1216 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1217 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
1218 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
1219 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
1220 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
1221 dsl_dir_phys(origin->ds_dir)->dd_clones =
1223 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
1225 VERIFY0(zap_add_int(mos,
1226 dsl_dir_phys(origin->ds_dir)->dd_clones,
1231 /* handle encryption */
1232 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx);
1234 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1235 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1237 dmu_buf_rele(dbuf, FTAG);
1239 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1240 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
1246 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
1250 VERIFY0(dmu_objset_from_ds(ds, &os));
1251 if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
1252 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1255 memset(&os->os_zil_header, 0, sizeof (os->os_zil_header));
1256 if (os->os_encrypted)
1257 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
1259 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
1260 dsl_dataset_sync(ds, zio, tx);
1261 VERIFY0(zio_wait(zio));
1263 /* dsl_dataset_sync_done will drop this reference. */
1264 dmu_buf_add_ref(ds->ds_dbuf, ds);
1265 dsl_dataset_sync_done(ds, tx);
1270 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
1271 dsl_dataset_t *origin, uint64_t flags, cred_t *cr,
1272 dsl_crypto_params_t *dcp, dmu_tx_t *tx)
1274 dsl_pool_t *dp = pdd->dd_pool;
1275 uint64_t dsobj, ddobj;
1278 ASSERT(dmu_tx_is_syncing(tx));
1279 ASSERT(lastname[0] != '@');
1281 * Filesystems will eventually have their origin set to dp_origin_snap,
1282 * but that's taken care of in dsl_dataset_create_sync_dd. When
1283 * creating a filesystem, this function is called with origin equal to
1287 ASSERT3P(origin, !=, dp->dp_origin_snap);
1289 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
1290 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
1292 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp,
1293 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
1295 dsl_deleg_set_create_perms(dd, tx, cr);
1298 * If we are creating a clone and the livelist feature is enabled,
1299 * add the entry DD_FIELD_LIVELIST to ZAP.
1301 if (origin != NULL &&
1302 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) {
1303 objset_t *mos = dd->dd_pool->dp_meta_objset;
1304 dsl_dir_zapify(dd, tx);
1305 uint64_t obj = dsl_deadlist_alloc(mos, tx);
1306 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST,
1307 sizeof (uint64_t), 1, &obj, tx));
1308 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx);
1312 * Since we're creating a new node we know it's a leaf, so we can
1313 * initialize the counts if the limit feature is active.
1315 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
1317 objset_t *os = dd->dd_pool->dp_meta_objset;
1319 dsl_dir_zapify(dd, tx);
1320 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
1321 sizeof (cnt), 1, &cnt, tx));
1322 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
1323 sizeof (cnt), 1, &cnt, tx));
1326 dsl_dir_rele(dd, FTAG);
1329 * If we are creating a clone, make sure we zero out any stale
1330 * data from the origin snapshots zil header.
1332 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
1335 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1336 dsl_dataset_zero_zil(ds, tx);
1337 dsl_dataset_rele(ds, FTAG);
1344 * The unique space in the head dataset can be calculated by subtracting
1345 * the space used in the most recent snapshot, that is still being used
1346 * in this file system, from the space currently in use. To figure out
1347 * the space in the most recent snapshot still in use, we need to take
1348 * the total space used in the snapshot and subtract out the space that
1349 * has been freed up since the snapshot was taken.
1352 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
1355 uint64_t dlused, dlcomp, dluncomp;
1357 ASSERT(!ds->ds_is_snapshot);
1359 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
1360 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
1364 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
1366 ASSERT3U(dlused, <=, mrs_used);
1367 dsl_dataset_phys(ds)->ds_unique_bytes =
1368 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1370 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1371 SPA_VERSION_UNIQUE_ACCURATE)
1372 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1376 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1379 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1380 uint64_t count __maybe_unused;
1383 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1384 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1387 * The err should not be ENOENT, but a bug in a previous version
1388 * of the code could cause upgrade_clones_cb() to not set
1389 * ds_next_snap_obj when it should, leading to a missing entry.
1390 * If we knew that the pool was created after
1391 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1392 * ENOENT. However, at least we can check that we don't have
1393 * too many entries in the next_clones_obj even after failing to
1398 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1400 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1405 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1407 return (&dsl_dataset_phys(ds)->ds_bp);
1411 dsl_dataset_get_spa(dsl_dataset_t *ds)
1413 return (ds->ds_dir->dd_pool->dp_spa);
1417 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1421 if (ds == NULL) /* this is the meta-objset */
1424 ASSERT(ds->ds_objset != NULL);
1426 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1427 panic("dirtying snapshot!");
1429 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1430 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
1432 dp = ds->ds_dir->dd_pool;
1433 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1434 objset_t *os = ds->ds_objset;
1436 /* up the hold count until we can be written out */
1437 dmu_buf_add_ref(ds->ds_dbuf, ds);
1439 /* if this dataset is encrypted, grab a reference to the DCK */
1440 if (ds->ds_dir->dd_crypto_obj != 0 &&
1441 !os->os_raw_receive &&
1442 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) {
1443 ASSERT3P(ds->ds_key_mapping, !=, NULL);
1444 key_mapping_add_ref(ds->ds_key_mapping, ds);
1450 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1454 if (!dmu_tx_is_syncing(tx))
1458 * If there's an fs-only reservation, any blocks that might become
1459 * owned by the snapshot dataset must be accommodated by space
1460 * outside of the reservation.
1462 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1463 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1464 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1465 return (SET_ERROR(ENOSPC));
1468 * Propagate any reserved space for this snapshot to other
1469 * snapshot checks in this sync group.
1472 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1478 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1479 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc)
1484 ds->ds_trysnap_txg = tx->tx_txg;
1486 if (!dmu_tx_is_syncing(tx))
1490 * We don't allow multiple snapshots of the same txg. If there
1491 * is already one, try again.
1493 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1494 return (SET_ERROR(EAGAIN));
1497 * Check for conflicting snapshot name.
1499 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1501 return (SET_ERROR(EEXIST));
1502 if (error != ENOENT)
1506 * We don't allow taking snapshots of inconsistent datasets, such as
1507 * those into which we are currently receiving. However, if we are
1508 * creating this snapshot as part of a receive, this check will be
1509 * executed atomically with respect to the completion of the receive
1510 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1511 * case we ignore this, knowing it will be fixed up for us shortly in
1512 * dmu_recv_end_sync().
1514 if (!recv && DS_IS_INCONSISTENT(ds))
1515 return (SET_ERROR(EBUSY));
1518 * Skip the check for temporary snapshots or if we have already checked
1519 * the counts in dsl_dataset_snapshot_check. This means we really only
1520 * check the count here when we're receiving a stream.
1522 if (cnt != 0 && cr != NULL) {
1523 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1524 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc);
1529 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1537 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1539 dsl_dataset_snapshot_arg_t *ddsa = arg;
1540 dsl_pool_t *dp = dmu_tx_pool(tx);
1545 * Pre-compute how many total new snapshots will be created for each
1546 * level in the tree and below. This is needed for validating the
1547 * snapshot limit when either taking a recursive snapshot or when
1548 * taking multiple snapshots.
1550 * The problem is that the counts are not actually adjusted when
1551 * we are checking, only when we finally sync. For a single snapshot,
1552 * this is easy, the count will increase by 1 at each node up the tree,
1553 * but its more complicated for the recursive/multiple snapshot case.
1555 * The dsl_fs_ss_limit_check function does recursively check the count
1556 * at each level up the tree but since it is validating each snapshot
1557 * independently we need to be sure that we are validating the complete
1558 * count for the entire set of snapshots. We do this by rolling up the
1559 * counts for each component of the name into an nvlist and then
1560 * checking each of those cases with the aggregated count.
1562 * This approach properly handles not only the recursive snapshot
1563 * case (where we get all of those on the ddsa_snaps list) but also
1564 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1565 * validate the limit on 'a' using a count of 2).
1567 * We validate the snapshot names in the third loop and only report
1570 if (dmu_tx_is_syncing(tx)) {
1572 nvlist_t *cnt_track = NULL;
1573 cnt_track = fnvlist_alloc();
1575 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP);
1577 /* Rollup aggregated counts into the cnt_track list */
1578 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1580 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1584 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN);
1585 pdelim = strchr(nm, '@');
1591 if (nvlist_lookup_uint64(cnt_track, nm,
1593 /* update existing entry */
1594 fnvlist_add_uint64(cnt_track, nm,
1598 fnvlist_add_uint64(cnt_track, nm, 1);
1601 pdelim = strrchr(nm, '/');
1604 } while (pdelim != NULL);
1607 kmem_free(nm, MAXPATHLEN);
1609 /* Check aggregated counts at each level */
1610 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1611 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1617 name = nvpair_name(pair);
1618 cnt = fnvpair_value_uint64(pair);
1621 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1623 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1624 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1625 ddsa->ddsa_cr, ddsa->ddsa_proc);
1626 dsl_dataset_rele(ds, FTAG);
1630 if (ddsa->ddsa_errors != NULL)
1631 fnvlist_add_int32(ddsa->ddsa_errors,
1634 /* only report one error for this check */
1638 nvlist_free(cnt_track);
1641 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1642 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1645 char *name, *atp = NULL;
1646 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1648 name = nvpair_name(pair);
1649 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1650 error = SET_ERROR(ENAMETOOLONG);
1652 atp = strchr(name, '@');
1654 error = SET_ERROR(EINVAL);
1656 (void) strlcpy(dsname, name, atp - name + 1);
1659 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1661 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1662 error = dsl_dataset_snapshot_check_impl(ds,
1663 atp + 1, tx, B_FALSE, 0, NULL, NULL);
1664 dsl_dataset_rele(ds, FTAG);
1668 if (ddsa->ddsa_errors != NULL) {
1669 fnvlist_add_int32(ddsa->ddsa_errors,
1680 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1683 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1685 dsl_dataset_phys_t *dsphys;
1686 uint64_t dsobj, crtxg;
1687 objset_t *mos = dp->dp_meta_objset;
1688 static zil_header_t zero_zil __maybe_unused;
1689 objset_t *os __maybe_unused;
1691 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1694 * If we are on an old pool, the zil must not be active, in which
1695 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1697 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1698 dmu_objset_from_ds(ds, &os) != 0 ||
1699 memcmp(&os->os_phys->os_zil_header, &zero_zil,
1700 sizeof (zero_zil)) == 0);
1702 /* Should not snapshot a dirty dataset. */
1703 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1706 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1709 * The origin's ds_creation_txg has to be < TXG_INITIAL
1711 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1716 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1717 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1718 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1719 dmu_buf_will_dirty(dbuf, tx);
1720 dsphys = dbuf->db_data;
1721 memset(dsphys, 0, sizeof (dsl_dataset_phys_t));
1722 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1723 dsphys->ds_fsid_guid = unique_create();
1724 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1725 sizeof (dsphys->ds_guid));
1726 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1727 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1728 dsphys->ds_next_snap_obj = ds->ds_object;
1729 dsphys->ds_num_children = 1;
1730 dsphys->ds_creation_time = gethrestime_sec();
1731 dsphys->ds_creation_txg = crtxg;
1732 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1733 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1734 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1735 dsphys->ds_uncompressed_bytes =
1736 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1737 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1738 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
1739 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1740 rrw_exit(&ds->ds_bp_rwlock, FTAG);
1741 dmu_buf_rele(dbuf, FTAG);
1743 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1744 if (zfeature_active(f, ds->ds_feature[f])) {
1745 dsl_dataset_activate_feature(dsobj, f,
1746 ds->ds_feature[f], tx);
1750 ASSERT3U(ds->ds_prev != 0, ==,
1751 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1753 uint64_t next_clones_obj =
1754 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1755 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1757 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1758 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1760 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1761 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1762 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1763 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1764 } else if (next_clones_obj != 0) {
1765 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1766 dsphys->ds_next_snap_obj, tx);
1767 VERIFY0(zap_add_int(mos,
1768 next_clones_obj, dsobj, tx));
1773 * If we have a reference-reservation on this dataset, we will
1774 * need to increase the amount of refreservation being charged
1775 * since our unique space is going to zero.
1777 if (ds->ds_reserved) {
1779 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1780 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1782 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1786 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1787 dsl_dataset_phys(ds)->ds_deadlist_obj =
1788 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1789 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1790 dsl_deadlist_close(&ds->ds_deadlist);
1791 dsl_deadlist_open(&ds->ds_deadlist, mos,
1792 dsl_dataset_phys(ds)->ds_deadlist_obj);
1793 dsl_deadlist_add_key(&ds->ds_deadlist,
1794 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1795 dsl_bookmark_snapshotted(ds, tx);
1797 if (dsl_dataset_remap_deadlist_exists(ds)) {
1798 uint64_t remap_deadlist_obj =
1799 dsl_dataset_get_remap_deadlist_object(ds);
1801 * Move the remap_deadlist to the snapshot. The head
1802 * will create a new remap deadlist on demand, from
1803 * dsl_dataset_block_remapped().
1805 dsl_dataset_unset_remap_deadlist_object(ds, tx);
1806 dsl_deadlist_close(&ds->ds_remap_deadlist);
1808 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
1809 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST,
1810 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx));
1814 * Create a ivset guid for this snapshot if the dataset is
1815 * encrypted. This may be overridden by a raw receive. A
1816 * previous implementation of this code did not have this
1817 * field as part of the on-disk format for ZFS encryption
1818 * (see errata #4). As part of the remediation for this
1819 * issue, we ask the user to enable the bookmark_v2 feature
1820 * which is now a dependency of the encryption feature. We
1821 * use this as a heuristic to determine when the user has
1822 * elected to correct any datasets created with the old code.
1823 * As a result, we only do this step if the bookmark_v2
1824 * feature is enabled, which limits the number of states a
1825 * given pool / dataset can be in with regards to terms of
1826 * correcting the issue.
1828 if (ds->ds_dir->dd_crypto_obj != 0 &&
1829 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) {
1830 uint64_t ivset_guid = unique_create();
1832 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
1833 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID,
1834 sizeof (ivset_guid), 1, &ivset_guid, tx));
1837 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1838 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1839 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1840 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1842 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1843 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1845 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1846 snapname, 8, 1, &dsobj, tx));
1849 dsl_dataset_rele(ds->ds_prev, ds);
1850 VERIFY0(dsl_dataset_hold_obj(dp,
1851 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1853 dsl_scan_ds_snapshotted(ds, tx);
1855 dsl_dir_snap_cmtime_update(ds->ds_dir);
1857 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " ");
1861 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1863 dsl_dataset_snapshot_arg_t *ddsa = arg;
1864 dsl_pool_t *dp = dmu_tx_pool(tx);
1867 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1868 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1871 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1873 name = nvpair_name(pair);
1874 atp = strchr(name, '@');
1875 (void) strlcpy(dsname, name, atp - name + 1);
1876 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1878 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1879 if (ddsa->ddsa_props != NULL) {
1880 dsl_props_set_sync_impl(ds->ds_prev,
1881 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1883 dsl_dataset_rele(ds, FTAG);
1888 * The snapshots must all be in the same pool.
1889 * All-or-nothing: if there are any failures, nothing will be modified.
1892 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1894 dsl_dataset_snapshot_arg_t ddsa;
1896 boolean_t needsuspend;
1900 nvlist_t *suspended = NULL;
1902 pair = nvlist_next_nvpair(snaps, NULL);
1905 firstname = nvpair_name(pair);
1907 error = spa_open(firstname, &spa, FTAG);
1910 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1911 spa_close(spa, FTAG);
1914 suspended = fnvlist_alloc();
1915 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1916 pair = nvlist_next_nvpair(snaps, pair)) {
1917 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1918 char *snapname = nvpair_name(pair);
1922 atp = strchr(snapname, '@');
1924 error = SET_ERROR(EINVAL);
1927 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1929 error = zil_suspend(fsname, &cookie);
1932 fnvlist_add_uint64(suspended, fsname,
1937 ddsa.ddsa_snaps = snaps;
1938 ddsa.ddsa_props = props;
1939 ddsa.ddsa_errors = errors;
1940 ddsa.ddsa_cr = CRED();
1941 ddsa.ddsa_proc = curproc;
1944 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1945 dsl_dataset_snapshot_sync, &ddsa,
1946 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1949 if (suspended != NULL) {
1950 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1951 pair = nvlist_next_nvpair(suspended, pair)) {
1952 zil_resume((void *)(uintptr_t)
1953 fnvpair_value_uint64(pair));
1955 fnvlist_free(suspended);
1959 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1960 pair = nvlist_next_nvpair(snaps, pair)) {
1961 zvol_create_minor(nvpair_name(pair));
1968 typedef struct dsl_dataset_snapshot_tmp_arg {
1969 const char *ddsta_fsname;
1970 const char *ddsta_snapname;
1971 minor_t ddsta_cleanup_minor;
1972 const char *ddsta_htag;
1973 } dsl_dataset_snapshot_tmp_arg_t;
1976 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1978 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1979 dsl_pool_t *dp = dmu_tx_pool(tx);
1983 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1987 /* NULL cred means no limit check for tmp snapshot */
1988 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1989 tx, B_FALSE, 0, NULL, NULL);
1991 dsl_dataset_rele(ds, FTAG);
1995 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1996 dsl_dataset_rele(ds, FTAG);
1997 return (SET_ERROR(ENOTSUP));
1999 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
2002 dsl_dataset_rele(ds, FTAG);
2006 dsl_dataset_rele(ds, FTAG);
2011 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
2013 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
2014 dsl_pool_t *dp = dmu_tx_pool(tx);
2015 dsl_dataset_t *ds = NULL;
2017 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
2019 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
2020 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
2021 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
2022 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
2024 dsl_dataset_rele(ds, FTAG);
2028 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
2029 minor_t cleanup_minor, const char *htag)
2031 dsl_dataset_snapshot_tmp_arg_t ddsta;
2034 boolean_t needsuspend;
2037 ddsta.ddsta_fsname = fsname;
2038 ddsta.ddsta_snapname = snapname;
2039 ddsta.ddsta_cleanup_minor = cleanup_minor;
2040 ddsta.ddsta_htag = htag;
2042 error = spa_open(fsname, &spa, FTAG);
2045 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
2046 spa_close(spa, FTAG);
2049 error = zil_suspend(fsname, &cookie);
2054 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
2055 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
2063 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
2065 ASSERT(dmu_tx_is_syncing(tx));
2066 ASSERT(ds->ds_objset != NULL);
2067 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
2070 * in case we had to change ds_fsid_guid when we opened it,
2073 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2074 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
2076 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
2077 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
2078 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
2079 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
2080 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
2081 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
2082 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
2083 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
2084 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
2085 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
2086 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
2087 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
2088 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
2091 dmu_objset_sync(ds->ds_objset, zio, tx);
2093 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
2094 if (zfeature_active(f, ds->ds_feature_activation[f])) {
2095 if (zfeature_active(f, ds->ds_feature[f]))
2097 dsl_dataset_activate_feature(ds->ds_object, f,
2098 ds->ds_feature_activation[f], tx);
2099 ds->ds_feature[f] = ds->ds_feature_activation[f];
2105 * Check if the percentage of blocks shared between the clone and the
2106 * snapshot (as opposed to those that are clone only) is below a certain
2110 dsl_livelist_should_disable(dsl_dataset_t *ds)
2112 uint64_t used, referenced;
2115 used = dsl_dir_get_usedds(ds->ds_dir);
2116 referenced = dsl_get_referenced(ds);
2117 ASSERT3U(referenced, >=, 0);
2118 ASSERT3U(used, >=, 0);
2119 if (referenced == 0)
2121 percent_shared = (100 * (referenced - used)) / referenced;
2122 if (percent_shared <= zfs_livelist_min_percent_shared)
2128 * Check if it is possible to combine two livelist entries into one.
2129 * This is the case if the combined number of 'live' blkptrs (ALLOCs that
2130 * don't have a matching FREE) is under the maximum sublist size.
2131 * We check this by subtracting twice the total number of frees from the total
2132 * number of blkptrs. FREEs are counted twice because each FREE blkptr
2133 * will cancel out an ALLOC blkptr when the livelist is processed.
2136 dsl_livelist_should_condense(dsl_deadlist_entry_t *first,
2137 dsl_deadlist_entry_t *next)
2139 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed +
2140 next->dle_bpobj.bpo_phys->bpo_num_freed;
2141 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs +
2142 next->dle_bpobj.bpo_phys->bpo_num_blkptrs;
2143 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries)
2148 typedef struct try_condense_arg {
2151 } try_condense_arg_t;
2154 * Iterate over the livelist entries, searching for a pair to condense.
2155 * A nonzero return value means stop, 0 means keep looking.
2158 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first)
2160 try_condense_arg_t *tca = arg;
2161 spa_t *spa = tca->spa;
2162 dsl_dataset_t *ds = tca->ds;
2163 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist;
2164 dsl_deadlist_entry_t *next;
2166 /* The condense thread has not yet been created at import */
2167 if (spa->spa_livelist_condense_zthr == NULL)
2170 /* A condense is already in progress */
2171 if (spa->spa_to_condense.ds != NULL)
2174 next = AVL_NEXT(&ll->dl_tree, &first->dle_node);
2175 /* The livelist has only one entry - don't condense it */
2179 /* Next is the newest entry - don't condense it */
2180 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL)
2183 /* This pair is not ready to condense but keep looking */
2184 if (!dsl_livelist_should_condense(first, next))
2188 * Add a ref to prevent the dataset from being evicted while
2189 * the condense zthr or synctask are running. Ref will be
2190 * released at the end of the condense synctask
2192 dmu_buf_add_ref(ds->ds_dbuf, spa);
2194 spa->spa_to_condense.ds = ds;
2195 spa->spa_to_condense.first = first;
2196 spa->spa_to_condense.next = next;
2197 spa->spa_to_condense.syncing = B_FALSE;
2198 spa->spa_to_condense.cancelled = B_FALSE;
2200 zthr_wakeup(spa->spa_livelist_condense_zthr);
2205 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx)
2207 dsl_dir_t *dd = ds->ds_dir;
2208 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
2209 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist);
2211 /* Check if we need to add a new sub-livelist */
2213 /* The livelist is empty */
2214 dsl_deadlist_add_key(&dd->dd_livelist,
2215 tx->tx_txg - 1, tx);
2216 } else if (spa_sync_pass(spa) == 1) {
2218 * Check if the newest entry is full. If it is, make a new one.
2219 * We only do this once per sync because we could overfill a
2220 * sublist in one sync pass and don't want to add another entry
2221 * for a txg that is already represented. This ensures that
2222 * blkptrs born in the same txg are stored in the same sublist.
2224 bpobj_t bpobj = last->dle_bpobj;
2225 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs;
2226 uint64_t free = bpobj.bpo_phys->bpo_num_freed;
2227 uint64_t alloc = all - free;
2228 if (alloc > zfs_livelist_max_entries) {
2229 dsl_deadlist_add_key(&dd->dd_livelist,
2230 tx->tx_txg - 1, tx);
2234 /* Insert each entry into the on-disk livelist */
2235 bplist_iterate(&dd->dd_pending_allocs,
2236 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx);
2237 bplist_iterate(&dd->dd_pending_frees,
2238 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx);
2240 /* Attempt to condense every pair of adjacent entries */
2241 try_condense_arg_t arg = {
2245 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense,
2250 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
2252 objset_t *os = ds->ds_objset;
2254 bplist_iterate(&ds->ds_pending_deadlist,
2255 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx);
2257 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) {
2258 dsl_flush_pending_livelist(ds, tx);
2259 if (dsl_livelist_should_disable(ds)) {
2260 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE);
2264 dsl_bookmark_sync_done(ds, tx);
2266 multilist_destroy(&os->os_synced_dnodes);
2268 if (os->os_encrypted)
2269 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE;
2271 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]);
2273 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));
2275 dmu_buf_rele(ds->ds_dbuf, ds);
2279 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val)
2282 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
2286 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
2289 * There may be missing entries in ds_next_clones_obj
2290 * due to a bug in a previous version of the code.
2291 * Only trust it if it has the right number of entries.
2293 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
2294 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
2297 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) {
2298 return (SET_ERROR(ENOENT));
2300 for (zap_cursor_init(&zc, mos,
2301 dsl_dataset_phys(ds)->ds_next_clones_obj);
2302 zap_cursor_retrieve(&zc, &za) == 0;
2303 zap_cursor_advance(&zc)) {
2304 dsl_dataset_t *clone;
2305 char buf[ZFS_MAX_DATASET_NAME_LEN];
2306 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
2307 za.za_first_integer, FTAG, &clone));
2308 dsl_dir_name(clone->ds_dir, buf);
2309 fnvlist_add_boolean(val, buf);
2310 dsl_dataset_rele(clone, FTAG);
2312 zap_cursor_fini(&zc);
2317 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
2319 nvlist_t *propval = fnvlist_alloc();
2320 nvlist_t *val = fnvlist_alloc();
2322 if (get_clones_stat_impl(ds, val) == 0) {
2323 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
2324 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
2329 nvlist_free(propval);
2333 get_receive_resume_token_impl(dsl_dataset_t *ds)
2335 if (!dsl_dataset_has_resume_receive_state(ds))
2338 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2341 uint8_t *compressed;
2343 nvlist_t *token_nv = fnvlist_alloc();
2344 size_t packed_size, compressed_size;
2346 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2347 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
2348 fnvlist_add_uint64(token_nv, "fromguid", val);
2350 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2351 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
2352 fnvlist_add_uint64(token_nv, "object", val);
2354 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2355 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
2356 fnvlist_add_uint64(token_nv, "offset", val);
2358 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2359 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
2360 fnvlist_add_uint64(token_nv, "bytes", val);
2362 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2363 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
2364 fnvlist_add_uint64(token_nv, "toguid", val);
2366 char buf[MAXNAMELEN];
2367 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
2368 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
2369 fnvlist_add_string(token_nv, "toname", buf);
2371 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
2372 DS_FIELD_RESUME_LARGEBLOCK) == 0) {
2373 fnvlist_add_boolean(token_nv, "largeblockok");
2375 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
2376 DS_FIELD_RESUME_EMBEDOK) == 0) {
2377 fnvlist_add_boolean(token_nv, "embedok");
2379 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
2380 DS_FIELD_RESUME_COMPRESSOK) == 0) {
2381 fnvlist_add_boolean(token_nv, "compressok");
2383 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
2384 DS_FIELD_RESUME_RAWOK) == 0) {
2385 fnvlist_add_boolean(token_nv, "rawok");
2387 if (dsl_dataset_feature_is_active(ds,
2388 SPA_FEATURE_REDACTED_DATASETS)) {
2389 uint64_t num_redact_snaps = 0;
2390 uint64_t *redact_snaps = NULL;
2391 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds,
2392 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps,
2393 &redact_snaps), ==, B_TRUE);
2394 fnvlist_add_uint64_array(token_nv, "redact_snaps",
2395 redact_snaps, num_redact_snaps);
2397 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
2398 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) {
2399 uint64_t num_redact_snaps = 0, int_size = 0;
2400 uint64_t *redact_snaps = NULL;
2401 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object,
2402 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size,
2403 &num_redact_snaps));
2404 ASSERT3U(int_size, ==, sizeof (uint64_t));
2406 redact_snaps = kmem_alloc(int_size * num_redact_snaps,
2408 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object,
2409 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size,
2410 num_redact_snaps, redact_snaps));
2411 fnvlist_add_uint64_array(token_nv, "book_redact_snaps",
2412 redact_snaps, num_redact_snaps);
2413 kmem_free(redact_snaps, int_size * num_redact_snaps);
2415 packed = fnvlist_pack(token_nv, &packed_size);
2416 fnvlist_free(token_nv);
2417 compressed = kmem_alloc(packed_size, KM_SLEEP);
2419 compressed_size = gzip_compress(packed, compressed,
2420 packed_size, packed_size, 6);
2423 fletcher_4_native_varsize(compressed, compressed_size, &cksum);
2425 size_t alloc_size = compressed_size * 2 + 1;
2426 str = kmem_alloc(alloc_size, KM_SLEEP);
2427 for (int i = 0; i < compressed_size; i++) {
2428 size_t offset = i * 2;
2429 (void) snprintf(str + offset, alloc_size - offset,
2430 "%02x", compressed[i]);
2432 str[compressed_size * 2] = '\0';
2433 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
2434 ZFS_SEND_RESUME_TOKEN_VERSION,
2435 (longlong_t)cksum.zc_word[0],
2436 (longlong_t)packed_size, str);
2437 kmem_free(packed, packed_size);
2438 kmem_free(str, alloc_size);
2439 kmem_free(compressed, packed_size);
2444 * Returns a string that represents the receive resume state token. It should
2445 * be freed with strfree(). NULL is returned if no resume state is present.
2448 get_receive_resume_token(dsl_dataset_t *ds)
2451 * A failed "newfs" (e.g. full) resumable receive leaves
2452 * the stats set on this dataset. Check here for the prop.
2454 char *token = get_receive_resume_token_impl(ds);
2458 * A failed incremental resumable receive leaves the
2459 * stats set on our child named "%recv". Check the child
2462 /* 6 extra bytes for /%recv */
2463 char name[ZFS_MAX_DATASET_NAME_LEN + 6];
2464 dsl_dataset_t *recv_ds;
2465 dsl_dataset_name(ds, name);
2466 if (strlcat(name, "/", sizeof (name)) < sizeof (name) &&
2467 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) &&
2468 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) {
2469 token = get_receive_resume_token_impl(recv_ds);
2470 dsl_dataset_rele(recv_ds, FTAG);
2476 dsl_get_refratio(dsl_dataset_t *ds)
2478 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
2479 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
2480 dsl_dataset_phys(ds)->ds_compressed_bytes);
2485 dsl_get_logicalreferenced(dsl_dataset_t *ds)
2487 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes);
2491 dsl_get_compressratio(dsl_dataset_t *ds)
2493 if (ds->ds_is_snapshot) {
2494 return (dsl_get_refratio(ds));
2496 dsl_dir_t *dd = ds->ds_dir;
2497 mutex_enter(&dd->dd_lock);
2498 uint64_t val = dsl_dir_get_compressratio(dd);
2499 mutex_exit(&dd->dd_lock);
2505 dsl_get_used(dsl_dataset_t *ds)
2507 if (ds->ds_is_snapshot) {
2508 return (dsl_dataset_phys(ds)->ds_unique_bytes);
2510 dsl_dir_t *dd = ds->ds_dir;
2511 mutex_enter(&dd->dd_lock);
2512 uint64_t val = dsl_dir_get_used(dd);
2513 mutex_exit(&dd->dd_lock);
2519 dsl_get_creation(dsl_dataset_t *ds)
2521 return (dsl_dataset_phys(ds)->ds_creation_time);
2525 dsl_get_creationtxg(dsl_dataset_t *ds)
2527 return (dsl_dataset_phys(ds)->ds_creation_txg);
2531 dsl_get_refquota(dsl_dataset_t *ds)
2533 return (ds->ds_quota);
2537 dsl_get_refreservation(dsl_dataset_t *ds)
2539 return (ds->ds_reserved);
2543 dsl_get_guid(dsl_dataset_t *ds)
2545 return (dsl_dataset_phys(ds)->ds_guid);
2549 dsl_get_unique(dsl_dataset_t *ds)
2551 return (dsl_dataset_phys(ds)->ds_unique_bytes);
2555 dsl_get_objsetid(dsl_dataset_t *ds)
2557 return (ds->ds_object);
2561 dsl_get_userrefs(dsl_dataset_t *ds)
2563 return (ds->ds_userrefs);
2567 dsl_get_defer_destroy(dsl_dataset_t *ds)
2569 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
2573 dsl_get_referenced(dsl_dataset_t *ds)
2575 return (dsl_dataset_phys(ds)->ds_referenced_bytes);
2579 dsl_get_numclones(dsl_dataset_t *ds)
2581 ASSERT(ds->ds_is_snapshot);
2582 return (dsl_dataset_phys(ds)->ds_num_children - 1);
2586 dsl_get_inconsistent(dsl_dataset_t *ds)
2588 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ?
2593 dsl_get_redacted(dsl_dataset_t *ds)
2595 return (dsl_dataset_feature_is_active(ds,
2596 SPA_FEATURE_REDACTED_DATASETS));
2600 dsl_get_available(dsl_dataset_t *ds)
2602 uint64_t refdbytes = dsl_get_referenced(ds);
2603 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir,
2605 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
2607 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2609 if (ds->ds_quota != 0) {
2611 * Adjust available bytes according to refquota
2613 if (refdbytes < ds->ds_quota) {
2614 availbytes = MIN(availbytes,
2615 ds->ds_quota - refdbytes);
2620 return (availbytes);
2624 dsl_get_written(dsl_dataset_t *ds, uint64_t *written)
2626 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2627 dsl_dataset_t *prev;
2628 int err = dsl_dataset_hold_obj(dp,
2629 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
2631 uint64_t comp, uncomp;
2632 err = dsl_dataset_space_written(prev, ds, written,
2634 dsl_dataset_rele(prev, FTAG);
2640 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2643 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap)
2645 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2646 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
2647 dsl_dataset_name(ds->ds_prev, snap);
2650 return (SET_ERROR(ENOENT));
2655 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval)
2659 if (dsl_dataset_get_uint64_array_feature(ds,
2660 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) {
2661 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps,
2667 * Returns the mountpoint property and source for the given dataset in the value
2668 * and source buffers. The value buffer must be at least as large as MAXPATHLEN
2669 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
2670 * Returns 0 on success and an error on failure.
2673 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
2677 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2679 /* Retrieve the mountpoint value stored in the zap object */
2680 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1,
2681 ZAP_MAXVALUELEN, value, source);
2687 * Process the dsname and source to find the full mountpoint string.
2688 * Can be skipped for 'legacy' or 'none'.
2690 if (value[0] == '/') {
2691 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
2693 const char *relpath;
2696 * If we inherit the mountpoint, even from a dataset
2697 * with a received value, the source will be the path of
2698 * the dataset we inherit from. If source is
2699 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2702 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2705 ASSERT0(strncmp(dsname, source, strlen(source)));
2706 relpath = dsname + strlen(source);
2707 if (relpath[0] == '/')
2711 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN);
2714 * Special case an alternate root of '/'. This will
2715 * avoid having multiple leading slashes in the
2718 if (strcmp(root, "/") == 0)
2722 * If the mountpoint is '/' then skip over this
2723 * if we are obtaining either an alternate root or
2724 * an inherited mountpoint.
2727 if (value[1] == '\0' && (root[0] != '\0' ||
2728 relpath[0] != '\0'))
2731 if (relpath[0] == '\0') {
2732 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s",
2735 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s",
2736 root, mnt, relpath[0] == '@' ? "" : "/",
2739 kmem_free(buf, ZAP_MAXVALUELEN);
2746 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
2748 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
2750 ASSERT(dsl_pool_config_held(dp));
2752 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO,
2753 dsl_get_refratio(ds));
2754 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
2755 dsl_get_logicalreferenced(ds));
2756 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
2757 dsl_get_compressratio(ds));
2758 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
2761 if (ds->ds_is_snapshot) {
2762 get_clones_stat(ds, nv);
2764 char buf[ZFS_MAX_DATASET_NAME_LEN];
2765 if (dsl_get_prev_snap(ds, buf) == 0)
2766 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP,
2768 dsl_dir_stats(ds->ds_dir, nv);
2771 nvlist_t *propval = fnvlist_alloc();
2772 dsl_get_redact_snaps(ds, propval);
2773 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS),
2775 nvlist_free(propval);
2777 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE,
2778 dsl_get_available(ds));
2779 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
2780 dsl_get_referenced(ds));
2781 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
2782 dsl_get_creation(ds));
2783 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
2784 dsl_get_creationtxg(ds));
2785 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
2786 dsl_get_refquota(ds));
2787 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
2788 dsl_get_refreservation(ds));
2789 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
2791 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
2792 dsl_get_unique(ds));
2793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
2794 dsl_get_objsetid(ds));
2795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
2796 dsl_get_userrefs(ds));
2797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
2798 dsl_get_defer_destroy(ds));
2799 dsl_dataset_crypt_stats(ds, nv);
2801 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
2803 if (dsl_get_written(ds, &written) == 0) {
2804 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
2809 if (!dsl_dataset_is_snapshot(ds)) {
2810 char *token = get_receive_resume_token(ds);
2811 if (token != NULL) {
2812 dsl_prop_nvlist_add_string(nv,
2813 ZFS_PROP_RECEIVE_RESUME_TOKEN, token);
2814 kmem_strfree(token);
2820 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
2822 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
2823 ASSERT(dsl_pool_config_held(dp));
2825 stat->dds_creation_txg = dsl_get_creationtxg(ds);
2826 stat->dds_inconsistent = dsl_get_inconsistent(ds);
2827 stat->dds_guid = dsl_get_guid(ds);
2828 stat->dds_redacted = dsl_get_redacted(ds);
2829 stat->dds_origin[0] = '\0';
2830 if (ds->ds_is_snapshot) {
2831 stat->dds_is_snapshot = B_TRUE;
2832 stat->dds_num_clones = dsl_get_numclones(ds);
2834 stat->dds_is_snapshot = B_FALSE;
2835 stat->dds_num_clones = 0;
2837 if (dsl_dir_is_clone(ds->ds_dir)) {
2838 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin);
2844 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
2846 return (ds->ds_fsid_guid);
2850 dsl_dataset_space(dsl_dataset_t *ds,
2851 uint64_t *refdbytesp, uint64_t *availbytesp,
2852 uint64_t *usedobjsp, uint64_t *availobjsp)
2854 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
2855 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
2856 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
2858 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2859 if (ds->ds_quota != 0) {
2861 * Adjust available bytes according to refquota
2863 if (*refdbytesp < ds->ds_quota)
2864 *availbytesp = MIN(*availbytesp,
2865 ds->ds_quota - *refdbytesp);
2869 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2870 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
2871 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2872 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
2876 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
2878 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool;
2881 ASSERT(dsl_pool_config_held(dp));
2884 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2885 birth = dsl_dataset_get_blkptr(ds)->blk_birth;
2886 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2887 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
2888 objset_t *os, *os_snap;
2890 * It may be that only the ZIL differs, because it was
2891 * reset in the head. Don't count that as being
2894 if (dmu_objset_from_ds(ds, &os) != 0)
2896 if (dmu_objset_from_ds(snap, &os_snap) != 0)
2898 return (memcmp(&os->os_phys->os_meta_dnode,
2899 &os_snap->os_phys->os_meta_dnode,
2900 sizeof (os->os_phys->os_meta_dnode)) != 0);
2905 typedef struct dsl_dataset_rename_snapshot_arg {
2906 const char *ddrsa_fsname;
2907 const char *ddrsa_oldsnapname;
2908 const char *ddrsa_newsnapname;
2909 boolean_t ddrsa_recursive;
2911 } dsl_dataset_rename_snapshot_arg_t;
2914 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2915 dsl_dataset_t *hds, void *arg)
2918 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2922 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2924 /* ignore nonexistent snapshots */
2925 return (error == ENOENT ? 0 : error);
2928 /* new name should not exist */
2929 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2931 error = SET_ERROR(EEXIST);
2932 else if (error == ENOENT)
2935 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2936 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2937 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
2938 error = SET_ERROR(ENAMETOOLONG);
2944 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2946 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2947 dsl_pool_t *dp = dmu_tx_pool(tx);
2951 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2955 if (ddrsa->ddrsa_recursive) {
2956 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2957 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2960 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2962 dsl_dataset_rele(hds, FTAG);
2967 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2968 dsl_dataset_t *hds, void *arg)
2970 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2973 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2976 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2977 ASSERT(error == 0 || error == ENOENT);
2978 if (error == ENOENT) {
2979 /* ignore nonexistent snapshots */
2983 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2985 /* log before we change the name */
2986 spa_history_log_internal_ds(ds, "rename", tx,
2987 "-> @%s", ddrsa->ddrsa_newsnapname);
2989 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2991 mutex_enter(&ds->ds_lock);
2992 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname,
2993 sizeof (ds->ds_snapname));
2994 mutex_exit(&ds->ds_lock);
2995 VERIFY0(zap_add(dp->dp_meta_objset,
2996 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2997 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2998 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname,
2999 ddrsa->ddrsa_newsnapname, B_TRUE);
3001 dsl_dataset_rele(ds, FTAG);
3006 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
3008 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
3009 dsl_pool_t *dp = dmu_tx_pool(tx);
3010 dsl_dataset_t *hds = NULL;
3012 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
3013 ddrsa->ddrsa_tx = tx;
3014 if (ddrsa->ddrsa_recursive) {
3015 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
3016 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
3019 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
3021 dsl_dataset_rele(hds, FTAG);
3025 dsl_dataset_rename_snapshot(const char *fsname,
3026 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
3028 dsl_dataset_rename_snapshot_arg_t ddrsa;
3030 ddrsa.ddrsa_fsname = fsname;
3031 ddrsa.ddrsa_oldsnapname = oldsnapname;
3032 ddrsa.ddrsa_newsnapname = newsnapname;
3033 ddrsa.ddrsa_recursive = recursive;
3035 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
3036 dsl_dataset_rename_snapshot_sync, &ddrsa,
3037 1, ZFS_SPACE_CHECK_RESERVED));
3041 * If we're doing an ownership handoff, we need to make sure that there is
3042 * only one long hold on the dataset. We're not allowed to change anything here
3043 * so we don't permanently release the long hold or regular hold here. We want
3044 * to do this only when syncing to avoid the dataset unexpectedly going away
3045 * when we release the long hold.
3048 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
3050 boolean_t held = B_FALSE;
3052 if (!dmu_tx_is_syncing(tx))
3055 dsl_dir_t *dd = ds->ds_dir;
3056 mutex_enter(&dd->dd_activity_lock);
3057 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) -
3058 (owner != NULL ? 1 : 0);
3060 * The value of dd_activity_waiters can chance as soon as we drop the
3061 * lock, but we're fine with that; new waiters coming in or old
3062 * waiters leaving doesn't cause problems, since we're going to cancel
3063 * waiters later anyway. The goal of this check is to verify that no
3064 * non-waiters have long-holds, and all new long-holds will be
3065 * prevented because we're holding the pool config as writer.
3067 if (holds != dd->dd_activity_waiters)
3069 mutex_exit(&dd->dd_activity_lock);
3072 return (SET_ERROR(EBUSY));
3078 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
3080 dsl_dataset_rollback_arg_t *ddra = arg;
3081 dsl_pool_t *dp = dmu_tx_pool(tx);
3083 int64_t unused_refres_delta;
3086 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
3090 /* must not be a snapshot */
3091 if (ds->ds_is_snapshot) {
3092 dsl_dataset_rele(ds, FTAG);
3093 return (SET_ERROR(EINVAL));
3096 /* must have a most recent snapshot */
3097 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
3098 dsl_dataset_rele(ds, FTAG);
3099 return (SET_ERROR(ESRCH));
3103 * No rollback to a snapshot created in the current txg, because
3104 * the rollback may dirty the dataset and create blocks that are
3105 * not reachable from the rootbp while having a birth txg that
3106 * falls into the snapshot's range.
3108 if (dmu_tx_is_syncing(tx) &&
3109 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
3110 dsl_dataset_rele(ds, FTAG);
3111 return (SET_ERROR(EAGAIN));
3115 * If the expected target snapshot is specified, then check that
3116 * the latest snapshot is it.
3118 if (ddra->ddra_tosnap != NULL) {
3119 dsl_dataset_t *snapds;
3121 /* Check if the target snapshot exists at all. */
3122 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds);
3125 * ESRCH is used to signal that the target snapshot does
3126 * not exist, while ENOENT is used to report that
3127 * the rolled back dataset does not exist.
3128 * ESRCH is also used to cover other cases where the
3129 * target snapshot is not related to the dataset being
3130 * rolled back such as being in a different pool.
3132 if (error == ENOENT || error == EXDEV)
3133 error = SET_ERROR(ESRCH);
3134 dsl_dataset_rele(ds, FTAG);
3137 ASSERT(snapds->ds_is_snapshot);
3139 /* Check if the snapshot is the latest snapshot indeed. */
3140 if (snapds != ds->ds_prev) {
3142 * Distinguish between the case where the only problem
3143 * is intervening snapshots (EEXIST) vs the snapshot
3144 * not being a valid target for rollback (ESRCH).
3146 if (snapds->ds_dir == ds->ds_dir ||
3147 (dsl_dir_is_clone(ds->ds_dir) &&
3148 dsl_dir_phys(ds->ds_dir)->dd_origin_obj ==
3149 snapds->ds_object)) {
3150 error = SET_ERROR(EEXIST);
3152 error = SET_ERROR(ESRCH);
3154 dsl_dataset_rele(snapds, FTAG);
3155 dsl_dataset_rele(ds, FTAG);
3158 dsl_dataset_rele(snapds, FTAG);
3161 /* must not have any bookmarks after the most recent snapshot */
3162 if (dsl_bookmark_latest_txg(ds) >
3163 dsl_dataset_phys(ds)->ds_prev_snap_txg) {
3164 dsl_dataset_rele(ds, FTAG);
3165 return (SET_ERROR(EEXIST));
3168 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
3170 dsl_dataset_rele(ds, FTAG);
3175 * Check if the snap we are rolling back to uses more than
3178 if (ds->ds_quota != 0 &&
3179 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
3180 dsl_dataset_rele(ds, FTAG);
3181 return (SET_ERROR(EDQUOT));
3185 * When we do the clone swap, we will temporarily use more space
3186 * due to the refreservation (the head will no longer have any
3187 * unique space, so the entire amount of the refreservation will need
3188 * to be free). We will immediately destroy the clone, freeing
3189 * this space, but the freeing happens over many txg's.
3191 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
3192 dsl_dataset_phys(ds)->ds_unique_bytes);
3194 if (unused_refres_delta > 0 &&
3195 unused_refres_delta >
3196 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
3197 dsl_dataset_rele(ds, FTAG);
3198 return (SET_ERROR(ENOSPC));
3201 dsl_dataset_rele(ds, FTAG);
3206 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
3208 dsl_dataset_rollback_arg_t *ddra = arg;
3209 dsl_pool_t *dp = dmu_tx_pool(tx);
3210 dsl_dataset_t *ds, *clone;
3212 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
3214 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
3216 dsl_dataset_name(ds->ds_prev, namebuf);
3217 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
3219 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
3220 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx);
3222 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
3224 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
3225 dsl_dataset_zero_zil(ds, tx);
3227 dsl_destroy_head_sync_impl(clone, tx);
3229 dsl_dataset_rele(clone, FTAG);
3230 dsl_dataset_rele(ds, FTAG);
3234 * Rolls back the given filesystem or volume to the most recent snapshot.
3235 * The name of the most recent snapshot will be returned under key "target"
3236 * in the result nvlist.
3239 * - The existing dataset MUST be owned by the specified owner at entry
3240 * - Upon return, dataset will still be held by the same owner, whether we
3243 * This mode is required any time the existing filesystem is mounted. See
3244 * notes above zfs_suspend_fs() for further details.
3247 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
3250 dsl_dataset_rollback_arg_t ddra;
3252 ddra.ddra_fsname = fsname;
3253 ddra.ddra_tosnap = tosnap;
3254 ddra.ddra_owner = owner;
3255 ddra.ddra_result = result;
3257 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
3258 dsl_dataset_rollback_sync, &ddra,
3259 1, ZFS_SPACE_CHECK_RESERVED));
3262 struct promotenode {
3267 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
3268 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
3270 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
3273 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
3275 dsl_dataset_promote_arg_t *ddpa = arg;
3276 dsl_pool_t *dp = dmu_tx_pool(tx);
3278 struct promotenode *snap;
3279 dsl_dataset_t *origin_ds, *origin_head;
3283 size_t max_snap_len;
3284 boolean_t conflicting_snaps;
3286 err = promote_hold(ddpa, dp, FTAG);
3290 hds = ddpa->ddpa_clone;
3291 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
3293 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
3294 promote_rele(ddpa, FTAG);
3295 return (SET_ERROR(EXDEV));
3298 snap = list_head(&ddpa->shared_snaps);
3299 origin_head = snap->ds;
3301 err = SET_ERROR(ENOENT);
3304 origin_ds = snap->ds;
3307 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir.
3308 * When doing a promote we must make sure the encryption root for
3309 * both the target and the target's origin does not change to avoid
3310 * needing to rewrap encryption keys
3312 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir);
3317 * Compute and check the amount of space to transfer. Since this is
3318 * so expensive, don't do the preliminary check.
3320 if (!dmu_tx_is_syncing(tx)) {
3321 promote_rele(ddpa, FTAG);
3325 /* compute origin's new unique space */
3326 snap = list_tail(&ddpa->clone_snaps);
3327 ASSERT(snap != NULL);
3328 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
3329 origin_ds->ds_object);
3330 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3331 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
3332 &ddpa->unique, &unused, &unused);
3335 * Walk the snapshots that we are moving
3337 * Compute space to transfer. Consider the incremental changes
3338 * to used by each snapshot:
3339 * (my used) = (prev's used) + (blocks born) - (blocks killed)
3340 * So each snapshot gave birth to:
3341 * (blocks born) = (my used) - (prev's used) + (blocks killed)
3342 * So a sequence would look like:
3343 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
3344 * Which simplifies to:
3345 * uN + kN + kN-1 + ... + k1 + k0
3346 * Note however, if we stop before we reach the ORIGIN we get:
3347 * uN + kN + kN-1 + ... + kM - uM-1
3349 conflicting_snaps = B_FALSE;
3351 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
3352 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
3353 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
3354 for (snap = list_head(&ddpa->shared_snaps); snap;
3355 snap = list_next(&ddpa->shared_snaps, snap)) {
3356 uint64_t val, dlused, dlcomp, dluncomp;
3357 dsl_dataset_t *ds = snap->ds;
3362 * If there are long holds, we won't be able to evict
3365 if (dsl_dataset_long_held(ds)) {
3366 err = SET_ERROR(EBUSY);
3370 /* Check that the snapshot name does not conflict */
3371 VERIFY0(dsl_dataset_get_snapname(ds));
3372 if (strlen(ds->ds_snapname) >= max_snap_len) {
3373 err = SET_ERROR(ENAMETOOLONG);
3376 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
3378 fnvlist_add_boolean(ddpa->err_ds,
3379 snap->ds->ds_snapname);
3380 conflicting_snaps = B_TRUE;
3381 } else if (err != ENOENT) {
3385 /* The very first snapshot does not have a deadlist */
3386 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
3389 dsl_deadlist_space(&ds->ds_deadlist,
3390 &dlused, &dlcomp, &dluncomp);
3391 ddpa->used += dlused;
3392 ddpa->comp += dlcomp;
3393 ddpa->uncomp += dluncomp;
3397 * Check that bookmarks that are being transferred don't have
3400 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks);
3401 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
3402 dsl_dataset_phys(origin_ds)->ds_creation_txg;
3403 dbn = AVL_NEXT(&origin_head->ds_bookmarks, dbn)) {
3404 if (strlen(dbn->dbn_name) >= max_snap_len) {
3405 err = SET_ERROR(ENAMETOOLONG);
3408 zfs_bookmark_phys_t bm;
3409 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone,
3410 dbn->dbn_name, &bm);
3413 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name);
3414 conflicting_snaps = B_TRUE;
3415 } else if (err == ESRCH) {
3417 } else if (err != 0) {
3423 * In order to return the full list of conflicting snapshots, we check
3424 * whether there was a conflict after traversing all of them.
3426 if (conflicting_snaps) {
3427 err = SET_ERROR(EEXIST);
3432 * If we are a clone of a clone then we never reached ORIGIN,
3433 * so we need to subtract out the clone origin's used space.
3435 if (ddpa->origin_origin) {
3437 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
3439 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
3441 dsl_dataset_phys(ddpa->origin_origin)->
3442 ds_uncompressed_bytes;
3445 /* Check that there is enough space and limit headroom here */
3446 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
3447 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc);
3452 * Compute the amounts of space that will be used by snapshots
3453 * after the promotion (for both origin and clone). For each,
3454 * it is the amount of space that will be on all of their
3455 * deadlists (that was not born before their new origin).
3457 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
3461 * Note, typically this will not be a clone of a clone,
3462 * so dd_origin_txg will be < TXG_INITIAL, so
3463 * these snaplist_space() -> dsl_deadlist_space_range()
3464 * calls will be fast because they do not have to
3465 * iterate over all bps.
3467 snap = list_head(&ddpa->origin_snaps);
3469 err = SET_ERROR(ENOENT);
3472 err = snaplist_space(&ddpa->shared_snaps,
3473 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
3477 err = snaplist_space(&ddpa->clone_snaps,
3478 snap->ds->ds_dir->dd_origin_txg, &space);
3481 ddpa->cloneusedsnap += space;
3483 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
3484 DD_FLAG_USED_BREAKDOWN) {
3485 err = snaplist_space(&ddpa->origin_snaps,
3486 dsl_dataset_phys(origin_ds)->ds_creation_txg,
3487 &ddpa->originusedsnap);
3493 promote_rele(ddpa, FTAG);
3498 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
3500 dsl_dataset_promote_arg_t *ddpa = arg;
3501 dsl_pool_t *dp = dmu_tx_pool(tx);
3503 struct promotenode *snap;
3504 dsl_dataset_t *origin_ds;
3505 dsl_dataset_t *origin_head;
3507 dsl_dir_t *odd = NULL;
3508 uint64_t oldnext_obj;
3511 ASSERT(nvlist_empty(ddpa->err_ds));
3513 VERIFY0(promote_hold(ddpa, dp, FTAG));
3514 hds = ddpa->ddpa_clone;
3516 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
3518 snap = list_head(&ddpa->shared_snaps);
3519 origin_ds = snap->ds;
3522 snap = list_head(&ddpa->origin_snaps);
3523 origin_head = snap->ds;
3526 * We need to explicitly open odd, since origin_ds's dd will be
3529 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
3532 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx);
3534 /* change origin's next snap */
3535 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
3536 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
3537 snap = list_tail(&ddpa->clone_snaps);
3538 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
3539 origin_ds->ds_object);
3540 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
3542 /* change the origin's next clone */
3543 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
3544 dsl_dataset_remove_from_next_clones(origin_ds,
3545 snap->ds->ds_object, tx);
3546 VERIFY0(zap_add_int(dp->dp_meta_objset,
3547 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
3552 dmu_buf_will_dirty(dd->dd_dbuf, tx);
3553 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
3554 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
3555 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
3556 dmu_buf_will_dirty(odd->dd_dbuf, tx);
3557 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
3558 origin_head->ds_dir->dd_origin_txg =
3559 dsl_dataset_phys(origin_ds)->ds_creation_txg;
3561 /* change dd_clone entries */
3562 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
3563 VERIFY0(zap_remove_int(dp->dp_meta_objset,
3564 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
3565 VERIFY0(zap_add_int(dp->dp_meta_objset,
3566 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
3567 hds->ds_object, tx));
3569 VERIFY0(zap_remove_int(dp->dp_meta_objset,
3570 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
3571 origin_head->ds_object, tx));
3572 if (dsl_dir_phys(dd)->dd_clones == 0) {
3573 dsl_dir_phys(dd)->dd_clones =
3574 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
3575 DMU_OT_NONE, 0, tx);
3577 VERIFY0(zap_add_int(dp->dp_meta_objset,
3578 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
3582 * Move bookmarks to this dir.
3584 dsl_bookmark_node_t *dbn_next;
3585 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks);
3586 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <=
3587 dsl_dataset_phys(origin_ds)->ds_creation_txg;
3589 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn);
3591 avl_remove(&origin_head->ds_bookmarks, dbn);
3592 VERIFY0(zap_remove(dp->dp_meta_objset,
3593 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx));
3595 dsl_bookmark_node_add(hds, dbn, tx);
3598 dsl_bookmark_next_changed(hds, origin_ds, tx);
3600 /* move snapshots to this dir */
3601 for (snap = list_head(&ddpa->shared_snaps); snap;
3602 snap = list_next(&ddpa->shared_snaps, snap)) {
3603 dsl_dataset_t *ds = snap->ds;
3606 * Property callbacks are registered to a particular
3607 * dsl_dir. Since ours is changing, evict the objset
3608 * so that they will be unregistered from the old dsl_dir.
3610 if (ds->ds_objset) {
3611 dmu_objset_evict(ds->ds_objset);
3612 ds->ds_objset = NULL;
3615 /* move snap name entry */
3616 VERIFY0(dsl_dataset_get_snapname(ds));
3617 VERIFY0(dsl_dataset_snap_remove(origin_head,
3618 ds->ds_snapname, tx, B_TRUE));
3619 VERIFY0(zap_add(dp->dp_meta_objset,
3620 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
3621 8, 1, &ds->ds_object, tx));
3622 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
3623 DD_FIELD_SNAPSHOT_COUNT, tx);
3625 /* change containing dsl_dir */
3626 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3627 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
3628 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
3629 ASSERT3P(ds->ds_dir, ==, odd);
3630 dsl_dir_rele(ds->ds_dir, ds);
3631 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
3632 NULL, ds, &ds->ds_dir));
3634 /* move any clone references */
3635 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
3636 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
3640 for (zap_cursor_init(&zc, dp->dp_meta_objset,
3641 dsl_dataset_phys(ds)->ds_next_clones_obj);
3642 zap_cursor_retrieve(&zc, &za) == 0;
3643 zap_cursor_advance(&zc)) {
3644 dsl_dataset_t *cnds;
3647 if (za.za_first_integer == oldnext_obj) {
3649 * We've already moved the
3650 * origin's reference.
3655 VERIFY0(dsl_dataset_hold_obj(dp,
3656 za.za_first_integer, FTAG, &cnds));
3657 o = dsl_dir_phys(cnds->ds_dir)->
3658 dd_head_dataset_obj;
3660 VERIFY0(zap_remove_int(dp->dp_meta_objset,
3661 dsl_dir_phys(odd)->dd_clones, o, tx));
3662 VERIFY0(zap_add_int(dp->dp_meta_objset,
3663 dsl_dir_phys(dd)->dd_clones, o, tx));
3664 dsl_dataset_rele(cnds, FTAG);
3666 zap_cursor_fini(&zc);
3669 ASSERT(!dsl_prop_hascb(ds));
3673 * Change space accounting.
3674 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
3675 * both be valid, or both be 0 (resulting in delta == 0). This
3676 * is true for each of {clone,origin} independently.
3679 delta = ddpa->cloneusedsnap -
3680 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
3681 ASSERT3S(delta, >=, 0);
3682 ASSERT3U(ddpa->used, >=, delta);
3683 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
3684 dsl_dir_diduse_space(dd, DD_USED_HEAD,
3685 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
3687 delta = ddpa->originusedsnap -
3688 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
3689 ASSERT3S(delta, <=, 0);
3690 ASSERT3U(ddpa->used, >=, -delta);
3691 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
3692 dsl_dir_diduse_space(odd, DD_USED_HEAD,
3693 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
3695 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
3698 * Since livelists are specific to a clone's origin txg, they
3699 * are no longer accurate. Destroy the livelist from the clone being
3700 * promoted. If the origin dataset is a clone, destroy its livelist
3703 dsl_dir_remove_livelist(dd, tx, B_TRUE);
3704 dsl_dir_remove_livelist(odd, tx, B_TRUE);
3706 /* log history record */
3707 spa_history_log_internal_ds(hds, "promote", tx, " ");
3709 dsl_dir_rele(odd, FTAG);
3710 promote_rele(ddpa, FTAG);
3714 * Make a list of dsl_dataset_t's for the snapshots between first_obj
3715 * (exclusive) and last_obj (inclusive). The list will be in reverse
3716 * order (last_obj will be the list_head()). If first_obj == 0, do all
3717 * snapshots back to this dataset's origin.
3720 snaplist_make(dsl_pool_t *dp,
3721 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
3723 uint64_t obj = last_obj;
3725 list_create(l, sizeof (struct promotenode),
3726 offsetof(struct promotenode, link));
3728 while (obj != first_obj) {
3730 struct promotenode *snap;
3733 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
3734 ASSERT(err != ENOENT);
3739 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
3741 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
3743 list_insert_tail(l, snap);
3744 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3751 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
3753 struct promotenode *snap;
3756 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
3757 uint64_t used, comp, uncomp;
3758 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3759 mintxg, UINT64_MAX, &used, &comp, &uncomp);
3766 snaplist_destroy(list_t *l, void *tag)
3768 struct promotenode *snap;
3770 if (l == NULL || !list_link_active(&l->list_head))
3773 while ((snap = list_tail(l)) != NULL) {
3774 list_remove(l, snap);
3775 dsl_dataset_rele(snap->ds, tag);
3776 kmem_free(snap, sizeof (*snap));
3782 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
3786 struct promotenode *snap;
3788 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
3792 dd = ddpa->ddpa_clone->ds_dir;
3794 if (ddpa->ddpa_clone->ds_is_snapshot ||
3795 !dsl_dir_is_clone(dd)) {
3796 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3797 return (SET_ERROR(EINVAL));
3800 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
3801 &ddpa->shared_snaps, tag);
3805 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
3806 &ddpa->clone_snaps, tag);
3810 snap = list_head(&ddpa->shared_snaps);
3811 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
3812 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
3813 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
3814 &ddpa->origin_snaps, tag);
3818 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
3819 error = dsl_dataset_hold_obj(dp,
3820 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
3821 tag, &ddpa->origin_origin);
3827 promote_rele(ddpa, tag);
3832 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
3834 snaplist_destroy(&ddpa->shared_snaps, tag);
3835 snaplist_destroy(&ddpa->clone_snaps, tag);
3836 snaplist_destroy(&ddpa->origin_snaps, tag);
3837 if (ddpa->origin_origin != NULL)
3838 dsl_dataset_rele(ddpa->origin_origin, tag);
3839 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3845 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
3846 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
3849 dsl_dataset_promote(const char *name, char *conflsnap)
3851 dsl_dataset_promote_arg_t ddpa = { 0 };
3854 nvpair_t *snap_pair;
3858 * We will modify space proportional to the number of
3859 * snapshots. Compute numsnaps.
3861 error = dmu_objset_hold(name, FTAG, &os);
3864 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
3865 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
3867 dmu_objset_rele(os, FTAG);
3871 ddpa.ddpa_clonename = name;
3872 ddpa.err_ds = fnvlist_alloc();
3874 ddpa.proc = curproc;
3876 error = dsl_sync_task(name, dsl_dataset_promote_check,
3877 dsl_dataset_promote_sync, &ddpa,
3878 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED);
3881 * Return the first conflicting snapshot found.
3883 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL);
3884 if (snap_pair != NULL && conflsnap != NULL)
3885 (void) strlcpy(conflsnap, nvpair_name(snap_pair),
3886 ZFS_MAX_DATASET_NAME_LEN);
3888 fnvlist_free(ddpa.err_ds);
3893 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
3894 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
3897 * "slack" factor for received datasets with refquota set on them.
3898 * See the bottom of this function for details on its use.
3900 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS *
3901 spa_asize_inflation;
3902 int64_t unused_refres_delta;
3904 /* they should both be heads */
3905 if (clone->ds_is_snapshot ||
3906 origin_head->ds_is_snapshot)
3907 return (SET_ERROR(EINVAL));
3909 /* if we are not forcing, the branch point should be just before them */
3910 if (!force && clone->ds_prev != origin_head->ds_prev)
3911 return (SET_ERROR(EINVAL));
3913 /* clone should be the clone (unless they are unrelated) */
3914 if (clone->ds_prev != NULL &&
3915 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
3916 origin_head->ds_dir != clone->ds_prev->ds_dir)
3917 return (SET_ERROR(EINVAL));
3919 /* the clone should be a child of the origin */
3920 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
3921 return (SET_ERROR(EINVAL));
3923 /* origin_head shouldn't be modified unless 'force' */
3925 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
3926 return (SET_ERROR(ETXTBSY));
3928 /* origin_head should have no long holds (e.g. is not mounted) */
3929 if (dsl_dataset_handoff_check(origin_head, owner, tx))
3930 return (SET_ERROR(EBUSY));
3932 /* check amount of any unconsumed refreservation */
3933 unused_refres_delta =
3934 (int64_t)MIN(origin_head->ds_reserved,
3935 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3936 (int64_t)MIN(origin_head->ds_reserved,
3937 dsl_dataset_phys(clone)->ds_unique_bytes);
3939 if (unused_refres_delta > 0 &&
3940 unused_refres_delta >
3941 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
3942 return (SET_ERROR(ENOSPC));
3945 * The clone can't be too much over the head's refquota.
3947 * To ensure that the entire refquota can be used, we allow one
3948 * transaction to exceed the refquota. Therefore, this check
3949 * needs to also allow for the space referenced to be more than the
3950 * refquota. The maximum amount of space that one transaction can use
3951 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3952 * overage ensures that we are able to receive a filesystem that
3953 * exceeds the refquota on the source system.
3955 * So that overage is the refquota_slack we use below.
3957 if (origin_head->ds_quota != 0 &&
3958 dsl_dataset_phys(clone)->ds_referenced_bytes >
3959 origin_head->ds_quota + refquota_slack)
3960 return (SET_ERROR(EDQUOT));
3966 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone,
3967 dsl_dataset_t *origin, dmu_tx_t *tx)
3969 uint64_t clone_remap_dl_obj, origin_remap_dl_obj;
3970 dsl_pool_t *dp = dmu_tx_pool(tx);
3972 ASSERT(dsl_pool_sync_context(dp));
3974 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone);
3975 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin);
3977 if (clone_remap_dl_obj != 0) {
3978 dsl_deadlist_close(&clone->ds_remap_deadlist);
3979 dsl_dataset_unset_remap_deadlist_object(clone, tx);
3981 if (origin_remap_dl_obj != 0) {
3982 dsl_deadlist_close(&origin->ds_remap_deadlist);
3983 dsl_dataset_unset_remap_deadlist_object(origin, tx);
3986 if (clone_remap_dl_obj != 0) {
3987 dsl_dataset_set_remap_deadlist_object(origin,
3988 clone_remap_dl_obj, tx);
3989 dsl_deadlist_open(&origin->ds_remap_deadlist,
3990 dp->dp_meta_objset, clone_remap_dl_obj);
3992 if (origin_remap_dl_obj != 0) {
3993 dsl_dataset_set_remap_deadlist_object(clone,
3994 origin_remap_dl_obj, tx);
3995 dsl_deadlist_open(&clone->ds_remap_deadlist,
3996 dp->dp_meta_objset, origin_remap_dl_obj);
4001 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
4002 dsl_dataset_t *origin_head, dmu_tx_t *tx)
4004 dsl_pool_t *dp = dmu_tx_pool(tx);
4005 int64_t unused_refres_delta;
4007 ASSERT(clone->ds_reserved == 0);
4009 * NOTE: On DEBUG kernels there could be a race between this and
4010 * the check function if spa_asize_inflation is adjusted...
4012 ASSERT(origin_head->ds_quota == 0 ||
4013 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
4014 DMU_MAX_ACCESS * spa_asize_inflation);
4015 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
4017 dsl_dir_cancel_waiters(origin_head->ds_dir);
4020 * Swap per-dataset feature flags.
4022 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
4023 if (!(spa_feature_table[f].fi_flags &
4024 ZFEATURE_FLAG_PER_DATASET)) {
4025 ASSERT(!dsl_dataset_feature_is_active(clone, f));
4026 ASSERT(!dsl_dataset_feature_is_active(origin_head, f));
4030 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f);
4031 void *clone_feature = clone->ds_feature[f];
4032 boolean_t origin_head_inuse =
4033 dsl_dataset_feature_is_active(origin_head, f);
4034 void *origin_head_feature = origin_head->ds_feature[f];
4037 dsl_dataset_deactivate_feature_impl(clone, f, tx);
4038 if (origin_head_inuse)
4039 dsl_dataset_deactivate_feature_impl(origin_head, f, tx);
4042 dsl_dataset_activate_feature(origin_head->ds_object, f,
4044 origin_head->ds_feature[f] = clone_feature;
4046 if (origin_head_inuse) {
4047 dsl_dataset_activate_feature(clone->ds_object, f,
4048 origin_head_feature, tx);
4049 clone->ds_feature[f] = origin_head_feature;
4053 dmu_buf_will_dirty(clone->ds_dbuf, tx);
4054 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
4056 if (clone->ds_objset != NULL) {
4057 dmu_objset_evict(clone->ds_objset);
4058 clone->ds_objset = NULL;
4061 if (origin_head->ds_objset != NULL) {
4062 dmu_objset_evict(origin_head->ds_objset);
4063 origin_head->ds_objset = NULL;
4066 unused_refres_delta =
4067 (int64_t)MIN(origin_head->ds_reserved,
4068 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
4069 (int64_t)MIN(origin_head->ds_reserved,
4070 dsl_dataset_phys(clone)->ds_unique_bytes);
4073 * Reset origin's unique bytes.
4076 dsl_dataset_t *origin = clone->ds_prev;
4077 uint64_t comp, uncomp;
4079 dmu_buf_will_dirty(origin->ds_dbuf, tx);
4080 dsl_deadlist_space_range(&clone->ds_deadlist,
4081 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
4082 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
4087 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
4088 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
4090 tmp = dsl_dataset_phys(origin_head)->ds_bp;
4091 dsl_dataset_phys(origin_head)->ds_bp =
4092 dsl_dataset_phys(clone)->ds_bp;
4093 dsl_dataset_phys(clone)->ds_bp = tmp;
4094 rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
4095 rrw_exit(&clone->ds_bp_rwlock, FTAG);
4098 /* set dd_*_bytes */
4100 int64_t dused, dcomp, duncomp;
4101 uint64_t cdl_used, cdl_comp, cdl_uncomp;
4102 uint64_t odl_used, odl_comp, odl_uncomp;
4104 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
4105 dd_used_breakdown[DD_USED_SNAP], ==, 0);
4107 dsl_deadlist_space(&clone->ds_deadlist,
4108 &cdl_used, &cdl_comp, &cdl_uncomp);
4109 dsl_deadlist_space(&origin_head->ds_deadlist,
4110 &odl_used, &odl_comp, &odl_uncomp);
4112 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
4114 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
4116 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
4118 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
4120 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
4122 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
4125 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
4126 dused, dcomp, duncomp, tx);
4127 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
4128 -dused, -dcomp, -duncomp, tx);
4131 * The difference in the space used by snapshots is the
4132 * difference in snapshot space due to the head's
4133 * deadlist (since that's the only thing that's
4134 * changing that affects the snapused).
4136 dsl_deadlist_space_range(&clone->ds_deadlist,
4137 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
4138 &cdl_used, &cdl_comp, &cdl_uncomp);
4139 dsl_deadlist_space_range(&origin_head->ds_deadlist,
4140 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
4141 &odl_used, &odl_comp, &odl_uncomp);
4142 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
4143 DD_USED_HEAD, DD_USED_SNAP, tx);
4146 /* swap ds_*_bytes */
4147 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
4148 dsl_dataset_phys(clone)->ds_referenced_bytes);
4149 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
4150 dsl_dataset_phys(clone)->ds_compressed_bytes);
4151 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
4152 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
4153 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
4154 dsl_dataset_phys(clone)->ds_unique_bytes);
4156 /* apply any parent delta for change in unconsumed refreservation */
4157 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
4158 unused_refres_delta, 0, 0, tx);
4163 dsl_deadlist_close(&clone->ds_deadlist);
4164 dsl_deadlist_close(&origin_head->ds_deadlist);
4165 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
4166 dsl_dataset_phys(clone)->ds_deadlist_obj);
4167 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
4168 dsl_dataset_phys(clone)->ds_deadlist_obj);
4169 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
4170 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
4171 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx);
4174 * If there is a bookmark at the origin, its "next dataset" is
4175 * changing, so we need to reset its FBN.
4177 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx);
4179 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
4182 * Destroy any livelists associated with the clone or the origin,
4183 * since after the swap the corresponding livelists are no longer
4186 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE);
4187 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE);
4189 spa_history_log_internal_ds(clone, "clone swap", tx,
4190 "parent=%s", origin_head->ds_dir->dd_myname);
4194 * Given a pool name and a dataset object number in that pool,
4195 * return the name of that dataset.
4198 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
4204 error = dsl_pool_hold(pname, FTAG, &dp);
4208 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
4210 dsl_dataset_name(ds, buf);
4211 dsl_dataset_rele(ds, FTAG);
4213 dsl_pool_rele(dp, FTAG);
4219 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
4220 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
4224 ASSERT3S(asize, >, 0);
4227 * *ref_rsrv is the portion of asize that will come from any
4228 * unconsumed refreservation space.
4232 mutex_enter(&ds->ds_lock);
4234 * Make a space adjustment for reserved bytes.
4236 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
4238 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
4240 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
4242 asize - MIN(asize, parent_delta(ds, asize + inflight));
4245 if (!check_quota || ds->ds_quota == 0) {
4246 mutex_exit(&ds->ds_lock);
4250 * If they are requesting more space, and our current estimate
4251 * is over quota, they get to try again unless the actual
4252 * on-disk is over quota and there are no pending changes (which
4253 * may free up space for us).
4255 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
4258 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
4259 error = SET_ERROR(ERESTART);
4261 error = SET_ERROR(EDQUOT);
4263 mutex_exit(&ds->ds_lock);
4268 typedef struct dsl_dataset_set_qr_arg {
4269 const char *ddsqra_name;
4270 zprop_source_t ddsqra_source;
4271 uint64_t ddsqra_value;
4272 } dsl_dataset_set_qr_arg_t;
4276 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
4278 dsl_dataset_set_qr_arg_t *ddsqra = arg;
4279 dsl_pool_t *dp = dmu_tx_pool(tx);
4284 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
4285 return (SET_ERROR(ENOTSUP));
4287 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
4291 if (ds->ds_is_snapshot) {
4292 dsl_dataset_rele(ds, FTAG);
4293 return (SET_ERROR(EINVAL));
4296 error = dsl_prop_predict(ds->ds_dir,
4297 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
4298 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
4300 dsl_dataset_rele(ds, FTAG);
4305 dsl_dataset_rele(ds, FTAG);
4309 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
4310 newval < ds->ds_reserved) {
4311 dsl_dataset_rele(ds, FTAG);
4312 return (SET_ERROR(ENOSPC));
4315 dsl_dataset_rele(ds, FTAG);
4320 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
4322 dsl_dataset_set_qr_arg_t *ddsqra = arg;
4323 dsl_pool_t *dp = dmu_tx_pool(tx);
4324 dsl_dataset_t *ds = NULL;
4327 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
4329 dsl_prop_set_sync_impl(ds,
4330 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
4331 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
4332 &ddsqra->ddsqra_value, tx);
4334 VERIFY0(dsl_prop_get_int_ds(ds,
4335 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
4337 if (ds->ds_quota != newval) {
4338 dmu_buf_will_dirty(ds->ds_dbuf, tx);
4339 ds->ds_quota = newval;
4341 dsl_dataset_rele(ds, FTAG);
4345 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
4348 dsl_dataset_set_qr_arg_t ddsqra;
4350 ddsqra.ddsqra_name = dsname;
4351 ddsqra.ddsqra_source = source;
4352 ddsqra.ddsqra_value = refquota;
4354 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
4355 dsl_dataset_set_refquota_sync, &ddsqra, 0,
4356 ZFS_SPACE_CHECK_EXTRA_RESERVED));
4360 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
4362 dsl_dataset_set_qr_arg_t *ddsqra = arg;
4363 dsl_pool_t *dp = dmu_tx_pool(tx);
4366 uint64_t newval, unique;
4368 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
4369 return (SET_ERROR(ENOTSUP));
4371 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
4375 if (ds->ds_is_snapshot) {
4376 dsl_dataset_rele(ds, FTAG);
4377 return (SET_ERROR(EINVAL));
4380 error = dsl_prop_predict(ds->ds_dir,
4381 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
4382 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
4384 dsl_dataset_rele(ds, FTAG);
4389 * If we are doing the preliminary check in open context, the
4390 * space estimates may be inaccurate.
4392 if (!dmu_tx_is_syncing(tx)) {
4393 dsl_dataset_rele(ds, FTAG);
4397 mutex_enter(&ds->ds_lock);
4398 if (!DS_UNIQUE_IS_ACCURATE(ds))
4399 dsl_dataset_recalc_head_uniq(ds);
4400 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
4401 mutex_exit(&ds->ds_lock);
4403 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
4404 uint64_t delta = MAX(unique, newval) -
4405 MAX(unique, ds->ds_reserved);
4408 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
4409 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
4410 dsl_dataset_rele(ds, FTAG);
4411 return (SET_ERROR(ENOSPC));
4415 dsl_dataset_rele(ds, FTAG);
4420 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
4421 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
4427 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
4428 source, sizeof (value), 1, &value, tx);
4430 VERIFY0(dsl_prop_get_int_ds(ds,
4431 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
4433 dmu_buf_will_dirty(ds->ds_dbuf, tx);
4434 mutex_enter(&ds->ds_dir->dd_lock);
4435 mutex_enter(&ds->ds_lock);
4436 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
4437 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
4438 delta = MAX(0, (int64_t)(newval - unique)) -
4439 MAX(0, (int64_t)(ds->ds_reserved - unique));
4440 ds->ds_reserved = newval;
4441 mutex_exit(&ds->ds_lock);
4443 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
4444 mutex_exit(&ds->ds_dir->dd_lock);
4448 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
4450 dsl_dataset_set_qr_arg_t *ddsqra = arg;
4451 dsl_pool_t *dp = dmu_tx_pool(tx);
4452 dsl_dataset_t *ds = NULL;
4454 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
4455 dsl_dataset_set_refreservation_sync_impl(ds,
4456 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
4457 dsl_dataset_rele(ds, FTAG);
4461 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
4462 uint64_t refreservation)
4464 dsl_dataset_set_qr_arg_t ddsqra;
4466 ddsqra.ddsqra_name = dsname;
4467 ddsqra.ddsqra_source = source;
4468 ddsqra.ddsqra_value = refreservation;
4470 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
4471 dsl_dataset_set_refreservation_sync, &ddsqra, 0,
4472 ZFS_SPACE_CHECK_EXTRA_RESERVED));
4475 typedef struct dsl_dataset_set_compression_arg {
4476 const char *ddsca_name;
4477 zprop_source_t ddsca_source;
4478 uint64_t ddsca_value;
4479 } dsl_dataset_set_compression_arg_t;
4482 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx)
4484 dsl_dataset_set_compression_arg_t *ddsca = arg;
4485 dsl_pool_t *dp = dmu_tx_pool(tx);
4487 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
4488 spa_feature_t f = zio_compress_to_feature(compval);
4490 if (f == SPA_FEATURE_NONE)
4491 return (SET_ERROR(EINVAL));
4493 if (!spa_feature_is_enabled(dp->dp_spa, f))
4494 return (SET_ERROR(ENOTSUP));
4500 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx)
4502 dsl_dataset_set_compression_arg_t *ddsca = arg;
4503 dsl_pool_t *dp = dmu_tx_pool(tx);
4504 dsl_dataset_t *ds = NULL;
4506 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value);
4507 spa_feature_t f = zio_compress_to_feature(compval);
4508 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN);
4510 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds));
4511 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) {
4512 ds->ds_feature_activation[f] = (void *)B_TRUE;
4513 dsl_dataset_activate_feature(ds->ds_object, f,
4514 ds->ds_feature_activation[f], tx);
4515 ds->ds_feature[f] = ds->ds_feature_activation[f];
4517 dsl_dataset_rele(ds, FTAG);
4521 dsl_dataset_set_compression(const char *dsname, zprop_source_t source,
4522 uint64_t compression)
4524 dsl_dataset_set_compression_arg_t ddsca;
4527 * The sync task is only required for zstd in order to activate
4528 * the feature flag when the property is first set.
4530 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD)
4533 ddsca.ddsca_name = dsname;
4534 ddsca.ddsca_source = source;
4535 ddsca.ddsca_value = compression;
4537 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check,
4538 dsl_dataset_set_compression_sync, &ddsca, 0,
4539 ZFS_SPACE_CHECK_EXTRA_RESERVED));
4543 * Return (in *usedp) the amount of space referenced by "new" that was not
4544 * referenced at the time the bookmark corresponds to. "New" may be a
4545 * snapshot or a head. The bookmark must be before new, in
4546 * new's filesystem (or its origin) -- caller verifies this.
4548 * The written space is calculated by considering two components: First, we
4549 * ignore any freed space, and calculate the written as new's used space
4550 * minus old's used space. Next, we add in the amount of space that was freed
4551 * between the two time points, thus reducing new's used space relative to
4552 * old's. Specifically, this is the space that was born before
4553 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a
4554 * previous deadlist).
4556 * space freed [---------------------]
4557 * snapshots ---O-------O--------O-------O------
4560 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN
4561 * flag is not set, we will calculate the freed_before_next based on the
4562 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap.
4565 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp,
4566 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
4569 dsl_pool_t *dp = new->ds_dir->dd_pool;
4571 ASSERT(dsl_pool_config_held(dp));
4572 if (dsl_dataset_is_snapshot(new)) {
4573 ASSERT3U(bmp->zbm_creation_txg, <,
4574 dsl_dataset_phys(new)->ds_creation_txg);
4578 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
4579 *usedp -= bmp->zbm_referenced_bytes_refd;
4582 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
4583 *compp -= bmp->zbm_compressed_bytes_refd;
4586 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
4587 *uncompp -= bmp->zbm_uncompressed_bytes_refd;
4589 dsl_dataset_t *snap = new;
4591 while (dsl_dataset_phys(snap)->ds_prev_snap_txg >
4592 bmp->zbm_creation_txg) {
4593 uint64_t used, comp, uncomp;
4595 dsl_deadlist_space_range(&snap->ds_deadlist,
4596 0, bmp->zbm_creation_txg,
4597 &used, &comp, &uncomp);
4602 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
4604 dsl_dataset_rele(snap, FTAG);
4605 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
4611 * We might not have the FBN if we are calculating written from
4612 * a snapshot (because we didn't know the correct "next" snapshot
4615 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) {
4616 *usedp += bmp->zbm_referenced_freed_before_next_snap;
4617 *compp += bmp->zbm_compressed_freed_before_next_snap;
4618 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap;
4620 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==,
4621 bmp->zbm_creation_txg);
4622 uint64_t used, comp, uncomp;
4623 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp);
4629 dsl_dataset_rele(snap, FTAG);
4634 * Return (in *usedp) the amount of space written in new that was not
4635 * present at the time the bookmark corresponds to. New may be a
4636 * snapshot or the head. Old must be a bookmark before new, in
4637 * new's filesystem (or its origin) -- caller verifies this.
4640 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp,
4641 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
4643 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN))
4644 return (SET_ERROR(ENOTSUP));
4645 return (dsl_dataset_space_written_impl(bmp, new,
4646 usedp, compp, uncompp));
4650 * Return (in *usedp) the amount of space written in new that is not
4651 * present in oldsnap. New may be a snapshot or the head. Old must be
4652 * a snapshot before new, in new's filesystem (or its origin). If not then
4653 * fail and return EINVAL.
4656 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
4657 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
4659 if (!dsl_dataset_is_before(new, oldsnap, 0))
4660 return (SET_ERROR(EINVAL));
4662 zfs_bookmark_phys_t zbm = { 0 };
4663 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap);
4664 zbm.zbm_guid = dsp->ds_guid;
4665 zbm.zbm_creation_txg = dsp->ds_creation_txg;
4666 zbm.zbm_creation_time = dsp->ds_creation_time;
4667 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes;
4668 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes;
4669 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes;
4672 * If oldsnap is the origin (or origin's origin, ...) of new,
4673 * we can't easily calculate the effective FBN. Therefore,
4674 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate
4675 * it relative to the correct "next": the next snapshot towards "new",
4676 * rather than the next snapshot in oldsnap's dsl_dir.
4678 return (dsl_dataset_space_written_impl(&zbm, new,
4679 usedp, compp, uncompp));
4683 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
4684 * lastsnap, and all snapshots in between are deleted.
4686 * blocks that would be freed [---------------------------]
4687 * snapshots ---O-------O--------O-------O--------O
4688 * firstsnap lastsnap
4690 * This is the set of blocks that were born after the snap before firstsnap,
4691 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
4692 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
4693 * We calculate this by iterating over the relevant deadlists (from the snap
4694 * after lastsnap, backward to the snap after firstsnap), summing up the
4695 * space on the deadlist that was born after the snap before firstsnap.
4698 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
4699 dsl_dataset_t *lastsnap,
4700 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
4704 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
4706 ASSERT(firstsnap->ds_is_snapshot);
4707 ASSERT(lastsnap->ds_is_snapshot);
4710 * Check that the snapshots are in the same dsl_dir, and firstsnap
4711 * is before lastsnap.
4713 if (firstsnap->ds_dir != lastsnap->ds_dir ||
4714 dsl_dataset_phys(firstsnap)->ds_creation_txg >
4715 dsl_dataset_phys(lastsnap)->ds_creation_txg)
4716 return (SET_ERROR(EINVAL));
4718 *usedp = *compp = *uncompp = 0;
4720 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
4721 while (snapobj != firstsnap->ds_object) {
4723 uint64_t used, comp, uncomp;
4725 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
4729 dsl_deadlist_space_range(&ds->ds_deadlist,
4730 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
4731 &used, &comp, &uncomp);
4736 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
4737 ASSERT3U(snapobj, !=, 0);
4738 dsl_dataset_rele(ds, FTAG);
4744 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
4745 * For example, they could both be snapshots of the same filesystem, and
4746 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
4747 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
4748 * filesystem. Or 'earlier' could be the origin's origin.
4750 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
4753 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
4754 uint64_t earlier_txg)
4756 dsl_pool_t *dp = later->ds_dir->dd_pool;
4760 ASSERT(dsl_pool_config_held(dp));
4761 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
4763 if (earlier_txg == 0)
4764 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
4766 if (later->ds_is_snapshot &&
4767 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
4770 if (later->ds_dir == earlier->ds_dir)
4774 * We check dd_origin_obj explicitly here rather than using
4775 * dsl_dir_is_clone() so that we will return TRUE if "earlier"
4776 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on
4779 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0)
4782 dsl_dataset_t *origin;
4783 error = dsl_dataset_hold_obj(dp,
4784 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
4787 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg &&
4788 origin->ds_dir == earlier->ds_dir) {
4789 dsl_dataset_rele(origin, FTAG);
4792 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
4793 dsl_dataset_rele(origin, FTAG);
4798 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
4800 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
4801 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
4805 dsl_dataset_is_zapified(dsl_dataset_t *ds)
4807 dmu_object_info_t doi;
4809 dmu_object_info_from_db(ds->ds_dbuf, &doi);
4810 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
4814 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
4816 return (dsl_dataset_is_zapified(ds) &&
4817 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
4818 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);
4822 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds)
4824 uint64_t remap_deadlist_obj;
4827 if (!dsl_dataset_is_zapified(ds))
4830 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
4831 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1,
4832 &remap_deadlist_obj);
4835 VERIFY3S(err, ==, ENOENT);
4839 ASSERT(remap_deadlist_obj != 0);
4840 return (remap_deadlist_obj);
4844 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds)
4846 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist),
4847 dsl_dataset_get_remap_deadlist_object(ds) != 0);
4848 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist));
4852 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj,
4856 dsl_dataset_zapify(ds, tx);
4857 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object,
4858 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx));
4862 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx)
4864 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset,
4865 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx));
4869 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
4871 uint64_t remap_deadlist_object;
4872 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
4874 ASSERT(dmu_tx_is_syncing(tx));
4875 ASSERT(dsl_dataset_remap_deadlist_exists(ds));
4877 remap_deadlist_object = ds->ds_remap_deadlist.dl_object;
4878 dsl_deadlist_close(&ds->ds_remap_deadlist);
4879 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx);
4880 dsl_dataset_unset_remap_deadlist_object(ds, tx);
4881 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
4885 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
4887 uint64_t remap_deadlist_obj;
4888 spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
4890 ASSERT(dmu_tx_is_syncing(tx));
4891 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock));
4893 * Currently we only create remap deadlists when there are indirect
4894 * vdevs with referenced mappings.
4896 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL));
4898 remap_deadlist_obj = dsl_deadlist_clone(
4899 &ds->ds_deadlist, UINT64_MAX,
4900 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
4901 dsl_dataset_set_remap_deadlist_object(ds,
4902 remap_deadlist_obj, tx);
4903 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
4904 remap_deadlist_obj);
4905 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
4909 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps,
4910 uint64_t num_redact_snaps, dmu_tx_t *tx)
4912 uint64_t dsobj = ds->ds_object;
4913 struct feature_type_uint64_array_arg *ftuaa =
4914 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP);
4915 ftuaa->length = (int64_t)num_redact_snaps;
4916 if (num_redact_snaps > 0) {
4917 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t),
4919 memcpy(ftuaa->array, redact_snaps, num_redact_snaps *
4922 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS,
4924 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa;
4928 #define RECORDSIZE_PERM ZMOD_RW
4930 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */
4931 #define RECORDSIZE_PERM ZMOD_RD
4933 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, INT, RECORDSIZE_PERM,
4934 "Max allowed record size");
4936 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW,
4937 "Allow mounting of redacted datasets");
4939 EXPORT_SYMBOL(dsl_dataset_hold);
4940 EXPORT_SYMBOL(dsl_dataset_hold_flags);
4941 EXPORT_SYMBOL(dsl_dataset_hold_obj);
4942 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags);
4943 EXPORT_SYMBOL(dsl_dataset_own);
4944 EXPORT_SYMBOL(dsl_dataset_own_obj);
4945 EXPORT_SYMBOL(dsl_dataset_name);
4946 EXPORT_SYMBOL(dsl_dataset_rele);
4947 EXPORT_SYMBOL(dsl_dataset_rele_flags);
4948 EXPORT_SYMBOL(dsl_dataset_disown);
4949 EXPORT_SYMBOL(dsl_dataset_tryown);
4950 EXPORT_SYMBOL(dsl_dataset_create_sync);
4951 EXPORT_SYMBOL(dsl_dataset_create_sync_dd);
4952 EXPORT_SYMBOL(dsl_dataset_snapshot_check);
4953 EXPORT_SYMBOL(dsl_dataset_snapshot_sync);
4954 EXPORT_SYMBOL(dsl_dataset_promote);
4955 EXPORT_SYMBOL(dsl_dataset_user_hold);
4956 EXPORT_SYMBOL(dsl_dataset_user_release);
4957 EXPORT_SYMBOL(dsl_dataset_get_holds);
4958 EXPORT_SYMBOL(dsl_dataset_get_blkptr);
4959 EXPORT_SYMBOL(dsl_dataset_get_spa);
4960 EXPORT_SYMBOL(dsl_dataset_modified_since_snap);
4961 EXPORT_SYMBOL(dsl_dataset_space_written);
4962 EXPORT_SYMBOL(dsl_dataset_space_wouldfree);
4963 EXPORT_SYMBOL(dsl_dataset_sync);
4964 EXPORT_SYMBOL(dsl_dataset_block_born);
4965 EXPORT_SYMBOL(dsl_dataset_block_kill);
4966 EXPORT_SYMBOL(dsl_dataset_dirty);
4967 EXPORT_SYMBOL(dsl_dataset_stats);
4968 EXPORT_SYMBOL(dsl_dataset_fast_stat);
4969 EXPORT_SYMBOL(dsl_dataset_space);
4970 EXPORT_SYMBOL(dsl_dataset_fsid_guid);
4971 EXPORT_SYMBOL(dsl_dsobj_to_dsname);
4972 EXPORT_SYMBOL(dsl_dataset_check_quota);
4973 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl);
4974 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl);