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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org>
24 * Copyright (c) 2011, 2015 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) 2014 Integros [integros.com]
29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
32 #include <sys/dmu_objset.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_prop.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/dmu_traverse.h>
38 #include <sys/dmu_impl.h>
39 #include <sys/dmu_send.h>
40 #include <sys/dmu_tx.h>
44 #include <sys/zfeature.h>
45 #include <sys/unique.h>
46 #include <sys/zfs_context.h>
47 #include <sys/zfs_ioctl.h>
49 #include <sys/zfs_znode.h>
50 #include <sys/zfs_onexit.h>
52 #include <sys/dsl_scan.h>
53 #include <sys/dsl_deadlist.h>
54 #include <sys/dsl_destroy.h>
55 #include <sys/dsl_userhold.h>
56 #include <sys/dsl_bookmark.h>
57 #include <sys/dmu_send.h>
58 #include <sys/zio_checksum.h>
59 #include <sys/zio_compress.h>
60 #include <zfs_fletcher.h>
62 SYSCTL_DECL(_vfs_zfs);
65 * The SPA supports block sizes up to 16MB. However, very large blocks
66 * can have an impact on i/o latency (e.g. tying up a spinning disk for
67 * ~300ms), and also potentially on the memory allocator. Therefore,
68 * we do not allow the recordsize to be set larger than zfs_max_recordsize
69 * (default 1MB). Larger blocks can be created by changing this tunable,
70 * and pools with larger blocks can always be imported and used, regardless
73 int zfs_max_recordsize = 1 * 1024 * 1024;
74 SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN,
75 &zfs_max_recordsize, 0,
76 "Maximum block size. Expect dragons when tuning this.");
78 #define SWITCH64(x, y) \
80 uint64_t __tmp = (x); \
85 #define DS_REF_MAX (1ULL << 62)
87 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
89 extern int spa_asize_inflation;
92 * Figure out how much of this delta should be propogated to the dsl_dir
93 * layer. If there's a refreservation, that space has already been
94 * partially accounted for in our ancestors.
97 parent_delta(dsl_dataset_t *ds, int64_t delta)
99 dsl_dataset_phys_t *ds_phys;
100 uint64_t old_bytes, new_bytes;
102 if (ds->ds_reserved == 0)
105 ds_phys = dsl_dataset_phys(ds);
106 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
107 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
109 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
110 return (new_bytes - old_bytes);
114 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
116 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
117 int compressed = BP_GET_PSIZE(bp);
118 int uncompressed = BP_GET_UCSIZE(bp);
121 dprintf_bp(bp, "ds=%p", ds);
123 ASSERT(dmu_tx_is_syncing(tx));
124 /* It could have been compressed away to nothing */
127 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
128 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
130 dsl_pool_mos_diduse_space(tx->tx_pool,
131 used, compressed, uncompressed);
135 dmu_buf_will_dirty(ds->ds_dbuf, tx);
136 mutex_enter(&ds->ds_lock);
137 delta = parent_delta(ds, used);
138 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
139 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
140 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
141 dsl_dataset_phys(ds)->ds_unique_bytes += used;
143 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
144 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
148 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
149 if (f != SPA_FEATURE_NONE)
150 ds->ds_feature_activation_needed[f] = B_TRUE;
152 mutex_exit(&ds->ds_lock);
153 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
154 compressed, uncompressed, tx);
155 dsl_dir_transfer_space(ds->ds_dir, used - delta,
156 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
160 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
163 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
164 int compressed = BP_GET_PSIZE(bp);
165 int uncompressed = BP_GET_UCSIZE(bp);
170 ASSERT(dmu_tx_is_syncing(tx));
171 ASSERT(bp->blk_birth <= tx->tx_txg);
174 dsl_free(tx->tx_pool, tx->tx_txg, bp);
175 dsl_pool_mos_diduse_space(tx->tx_pool,
176 -used, -compressed, -uncompressed);
179 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
181 ASSERT(!ds->ds_is_snapshot);
182 dmu_buf_will_dirty(ds->ds_dbuf, tx);
184 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
187 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
188 dsl_free(tx->tx_pool, tx->tx_txg, bp);
190 mutex_enter(&ds->ds_lock);
191 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
192 !DS_UNIQUE_IS_ACCURATE(ds));
193 delta = parent_delta(ds, -used);
194 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
195 mutex_exit(&ds->ds_lock);
196 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
197 delta, -compressed, -uncompressed, tx);
198 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
199 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
201 dprintf_bp(bp, "putting on dead list: %s", "");
204 * We are here as part of zio's write done callback,
205 * which means we're a zio interrupt thread. We can't
206 * call dsl_deadlist_insert() now because it may block
207 * waiting for I/O. Instead, put bp on the deferred
208 * queue and let dsl_pool_sync() finish the job.
210 bplist_append(&ds->ds_pending_deadlist, bp);
212 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
214 ASSERT3U(ds->ds_prev->ds_object, ==,
215 dsl_dataset_phys(ds)->ds_prev_snap_obj);
216 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
217 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
218 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
219 ds->ds_object && bp->blk_birth >
220 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
221 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
222 mutex_enter(&ds->ds_prev->ds_lock);
223 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
224 mutex_exit(&ds->ds_prev->ds_lock);
226 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
227 dsl_dir_transfer_space(ds->ds_dir, used,
228 DD_USED_HEAD, DD_USED_SNAP, tx);
231 mutex_enter(&ds->ds_lock);
232 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
233 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
234 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
235 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
236 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
237 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
238 mutex_exit(&ds->ds_lock);
244 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
246 uint64_t trysnap = 0;
251 * The snapshot creation could fail, but that would cause an
252 * incorrect FALSE return, which would only result in an
253 * overestimation of the amount of space that an operation would
254 * consume, which is OK.
256 * There's also a small window where we could miss a pending
257 * snapshot, because we could set the sync task in the quiescing
258 * phase. So this should only be used as a guess.
260 if (ds->ds_trysnap_txg >
261 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
262 trysnap = ds->ds_trysnap_txg;
263 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap));
267 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
270 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) ||
271 (bp != NULL && BP_IS_HOLE(bp)))
274 ddt_prefetch(dsl_dataset_get_spa(ds), bp);
280 dsl_dataset_evict(void *dbu)
282 dsl_dataset_t *ds = dbu;
284 ASSERT(ds->ds_owner == NULL);
288 unique_remove(ds->ds_fsid_guid);
290 if (ds->ds_objset != NULL)
291 dmu_objset_evict(ds->ds_objset);
294 dsl_dataset_rele(ds->ds_prev, ds);
298 bplist_destroy(&ds->ds_pending_deadlist);
299 if (ds->ds_deadlist.dl_os != NULL)
300 dsl_deadlist_close(&ds->ds_deadlist);
302 dsl_dir_async_rele(ds->ds_dir, ds);
304 ASSERT(!list_link_active(&ds->ds_synced_link));
306 list_destroy(&ds->ds_prop_cbs);
307 if (mutex_owned(&ds->ds_lock))
308 mutex_exit(&ds->ds_lock);
309 mutex_destroy(&ds->ds_lock);
310 if (mutex_owned(&ds->ds_opening_lock))
311 mutex_exit(&ds->ds_opening_lock);
312 mutex_destroy(&ds->ds_opening_lock);
313 mutex_destroy(&ds->ds_sendstream_lock);
314 refcount_destroy(&ds->ds_longholds);
316 kmem_free(ds, sizeof (dsl_dataset_t));
320 dsl_dataset_get_snapname(dsl_dataset_t *ds)
322 dsl_dataset_phys_t *headphys;
325 dsl_pool_t *dp = ds->ds_dir->dd_pool;
326 objset_t *mos = dp->dp_meta_objset;
328 if (ds->ds_snapname[0])
330 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
333 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
337 headphys = headdbuf->db_data;
338 err = zap_value_search(dp->dp_meta_objset,
339 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
340 dmu_buf_rele(headdbuf, FTAG);
345 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
347 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
348 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
352 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
357 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
358 value, mt, NULL, 0, NULL);
359 if (err == ENOTSUP && mt == MT_FIRST)
360 err = zap_lookup(mos, snapobj, name, 8, 1, value);
365 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
368 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
369 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
373 dsl_dir_snap_cmtime_update(ds->ds_dir);
375 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
380 err = zap_remove_norm(mos, snapobj, name, mt, tx);
381 if (err == ENOTSUP && mt == MT_FIRST)
382 err = zap_remove(mos, snapobj, name, tx);
384 if (err == 0 && adj_cnt)
385 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
386 DD_FIELD_SNAPSHOT_COUNT, tx);
392 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
394 dmu_buf_t *dbuf = ds->ds_dbuf;
395 boolean_t result = B_FALSE;
397 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
398 ds->ds_object, DMU_BONUS_BLKID, tag)) {
400 if (ds == dmu_buf_get_user(dbuf))
403 dmu_buf_rele(dbuf, tag);
410 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
413 objset_t *mos = dp->dp_meta_objset;
417 dmu_object_info_t doi;
419 ASSERT(dsl_pool_config_held(dp));
421 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
425 /* Make sure dsobj has the correct object type. */
426 dmu_object_info_from_db(dbuf, &doi);
427 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
428 dmu_buf_rele(dbuf, tag);
429 return (SET_ERROR(EINVAL));
432 ds = dmu_buf_get_user(dbuf);
434 dsl_dataset_t *winner = NULL;
436 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
438 ds->ds_object = dsobj;
439 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
441 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
442 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
443 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
444 refcount_create(&ds->ds_longholds);
446 bplist_create(&ds->ds_pending_deadlist);
447 dsl_deadlist_open(&ds->ds_deadlist,
448 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
450 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
451 offsetof(dmu_sendarg_t, dsa_link));
453 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
454 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
456 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
457 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
458 if (!(spa_feature_table[f].fi_flags &
459 ZFEATURE_FLAG_PER_DATASET))
461 err = zap_contains(mos, dsobj,
462 spa_feature_table[f].fi_guid);
464 ds->ds_feature_inuse[f] = B_TRUE;
466 ASSERT3U(err, ==, ENOENT);
472 err = dsl_dir_hold_obj(dp,
473 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
475 mutex_destroy(&ds->ds_lock);
476 mutex_destroy(&ds->ds_opening_lock);
477 mutex_destroy(&ds->ds_sendstream_lock);
478 refcount_destroy(&ds->ds_longholds);
479 bplist_destroy(&ds->ds_pending_deadlist);
480 dsl_deadlist_close(&ds->ds_deadlist);
481 kmem_free(ds, sizeof (dsl_dataset_t));
482 dmu_buf_rele(dbuf, tag);
486 if (!ds->ds_is_snapshot) {
487 ds->ds_snapname[0] = '\0';
488 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
489 err = dsl_dataset_hold_obj(dp,
490 dsl_dataset_phys(ds)->ds_prev_snap_obj,
493 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
494 int zaperr = zap_lookup(mos, ds->ds_object,
495 DS_FIELD_BOOKMARK_NAMES,
496 sizeof (ds->ds_bookmarks), 1,
498 if (zaperr != ENOENT)
502 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
503 err = dsl_dataset_get_snapname(ds);
505 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
507 ds->ds_dir->dd_pool->dp_meta_objset,
508 dsl_dataset_phys(ds)->ds_userrefs_obj,
513 if (err == 0 && !ds->ds_is_snapshot) {
514 err = dsl_prop_get_int_ds(ds,
515 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
518 err = dsl_prop_get_int_ds(ds,
519 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
523 ds->ds_reserved = ds->ds_quota = 0;
526 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf);
528 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
530 if (err != 0 || winner != NULL) {
531 bplist_destroy(&ds->ds_pending_deadlist);
532 dsl_deadlist_close(&ds->ds_deadlist);
534 dsl_dataset_rele(ds->ds_prev, ds);
535 dsl_dir_rele(ds->ds_dir, ds);
536 mutex_destroy(&ds->ds_lock);
537 mutex_destroy(&ds->ds_opening_lock);
538 mutex_destroy(&ds->ds_sendstream_lock);
539 refcount_destroy(&ds->ds_longholds);
540 kmem_free(ds, sizeof (dsl_dataset_t));
542 dmu_buf_rele(dbuf, tag);
548 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
551 ASSERT3P(ds->ds_dbuf, ==, dbuf);
552 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
553 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
554 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
555 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
561 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
562 void *tag, dsl_dataset_t **dsp)
565 const char *snapname;
570 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
574 ASSERT(dsl_pool_config_held(dp));
575 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
577 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
579 err = SET_ERROR(ENOENT);
581 /* we may be looking for a snapshot */
582 if (err == 0 && snapname != NULL) {
583 dsl_dataset_t *snap_ds;
585 if (*snapname++ != '@') {
586 dsl_dataset_rele(ds, tag);
587 dsl_dir_rele(dd, FTAG);
588 return (SET_ERROR(ENOENT));
591 dprintf("looking for snapshot '%s'\n", snapname);
592 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
594 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
595 dsl_dataset_rele(ds, tag);
598 mutex_enter(&snap_ds->ds_lock);
599 if (snap_ds->ds_snapname[0] == 0)
600 (void) strlcpy(snap_ds->ds_snapname, snapname,
601 sizeof (snap_ds->ds_snapname));
602 mutex_exit(&snap_ds->ds_lock);
608 dsl_dir_rele(dd, FTAG);
613 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
614 void *tag, dsl_dataset_t **dsp)
616 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
619 if (!dsl_dataset_tryown(*dsp, tag)) {
620 dsl_dataset_rele(*dsp, tag);
622 return (SET_ERROR(EBUSY));
628 dsl_dataset_own(dsl_pool_t *dp, const char *name,
629 void *tag, dsl_dataset_t **dsp)
631 int err = dsl_dataset_hold(dp, name, tag, dsp);
634 if (!dsl_dataset_tryown(*dsp, tag)) {
635 dsl_dataset_rele(*dsp, tag);
636 return (SET_ERROR(EBUSY));
642 * See the comment above dsl_pool_hold() for details. In summary, a long
643 * hold is used to prevent destruction of a dataset while the pool hold
644 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
646 * The dataset and pool must be held when this function is called. After it
647 * is called, the pool hold may be released while the dataset is still held
651 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
653 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
654 (void) refcount_add(&ds->ds_longholds, tag);
658 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
660 (void) refcount_remove(&ds->ds_longholds, tag);
663 /* Return B_TRUE if there are any long holds on this dataset. */
665 dsl_dataset_long_held(dsl_dataset_t *ds)
667 return (!refcount_is_zero(&ds->ds_longholds));
671 dsl_dataset_name(dsl_dataset_t *ds, char *name)
674 (void) strcpy(name, "mos");
676 dsl_dir_name(ds->ds_dir, name);
677 VERIFY0(dsl_dataset_get_snapname(ds));
678 if (ds->ds_snapname[0]) {
679 (void) strcat(name, "@");
681 * We use a "recursive" mutex so that we
682 * can call dprintf_ds() with ds_lock held.
684 if (!MUTEX_HELD(&ds->ds_lock)) {
685 mutex_enter(&ds->ds_lock);
686 (void) strcat(name, ds->ds_snapname);
687 mutex_exit(&ds->ds_lock);
689 (void) strcat(name, ds->ds_snapname);
696 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
698 dmu_buf_rele(ds->ds_dbuf, tag);
702 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
704 ASSERT3P(ds->ds_owner, ==, tag);
705 ASSERT(ds->ds_dbuf != NULL);
707 mutex_enter(&ds->ds_lock);
709 mutex_exit(&ds->ds_lock);
710 dsl_dataset_long_rele(ds, tag);
711 dsl_dataset_rele(ds, tag);
715 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
717 boolean_t gotit = FALSE;
719 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
720 mutex_enter(&ds->ds_lock);
721 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
723 dsl_dataset_long_hold(ds, tag);
726 mutex_exit(&ds->ds_lock);
731 dsl_dataset_has_owner(dsl_dataset_t *ds)
734 mutex_enter(&ds->ds_lock);
735 rv = (ds->ds_owner != NULL);
736 mutex_exit(&ds->ds_lock);
741 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
743 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
744 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
747 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
749 spa_feature_incr(spa, f, tx);
750 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
752 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
753 sizeof (zero), 1, &zero, tx));
757 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
759 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
760 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
762 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
764 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
765 spa_feature_decr(spa, f, tx);
769 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
770 uint64_t flags, dmu_tx_t *tx)
772 dsl_pool_t *dp = dd->dd_pool;
774 dsl_dataset_phys_t *dsphys;
776 objset_t *mos = dp->dp_meta_objset;
779 origin = dp->dp_origin_snap;
781 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
782 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
783 ASSERT(dmu_tx_is_syncing(tx));
784 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
786 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
787 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
788 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
789 dmu_buf_will_dirty(dbuf, tx);
790 dsphys = dbuf->db_data;
791 bzero(dsphys, sizeof (dsl_dataset_phys_t));
792 dsphys->ds_dir_obj = dd->dd_object;
793 dsphys->ds_flags = flags;
794 dsphys->ds_fsid_guid = unique_create();
796 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
797 sizeof (dsphys->ds_guid));
798 } while (dsphys->ds_guid == 0);
799 dsphys->ds_snapnames_zapobj =
800 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
802 dsphys->ds_creation_time = gethrestime_sec();
803 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
805 if (origin == NULL) {
806 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
808 dsl_dataset_t *ohds; /* head of the origin snapshot */
810 dsphys->ds_prev_snap_obj = origin->ds_object;
811 dsphys->ds_prev_snap_txg =
812 dsl_dataset_phys(origin)->ds_creation_txg;
813 dsphys->ds_referenced_bytes =
814 dsl_dataset_phys(origin)->ds_referenced_bytes;
815 dsphys->ds_compressed_bytes =
816 dsl_dataset_phys(origin)->ds_compressed_bytes;
817 dsphys->ds_uncompressed_bytes =
818 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
819 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
822 * Inherit flags that describe the dataset's contents
823 * (INCONSISTENT) or properties (Case Insensitive).
825 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
826 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
828 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
829 if (origin->ds_feature_inuse[f])
830 dsl_dataset_activate_feature(dsobj, f, tx);
833 dmu_buf_will_dirty(origin->ds_dbuf, tx);
834 dsl_dataset_phys(origin)->ds_num_children++;
836 VERIFY0(dsl_dataset_hold_obj(dp,
837 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
839 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
840 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
841 dsl_dataset_rele(ohds, FTAG);
843 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
844 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
845 dsl_dataset_phys(origin)->ds_next_clones_obj =
847 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
849 VERIFY0(zap_add_int(mos,
850 dsl_dataset_phys(origin)->ds_next_clones_obj,
854 dmu_buf_will_dirty(dd->dd_dbuf, tx);
855 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
856 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
857 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
858 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
859 dsl_dir_phys(origin->ds_dir)->dd_clones =
861 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
863 VERIFY0(zap_add_int(mos,
864 dsl_dir_phys(origin->ds_dir)->dd_clones,
869 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
870 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
872 dmu_buf_rele(dbuf, FTAG);
874 dmu_buf_will_dirty(dd->dd_dbuf, tx);
875 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
881 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
885 VERIFY0(dmu_objset_from_ds(ds, &os));
886 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
887 dsl_dataset_dirty(ds, tx);
891 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
892 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
894 dsl_pool_t *dp = pdd->dd_pool;
895 uint64_t dsobj, ddobj;
898 ASSERT(dmu_tx_is_syncing(tx));
899 ASSERT(lastname[0] != '@');
901 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
902 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
904 dsobj = dsl_dataset_create_sync_dd(dd, origin,
905 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
907 dsl_deleg_set_create_perms(dd, tx, cr);
910 * Since we're creating a new node we know it's a leaf, so we can
911 * initialize the counts if the limit feature is active.
913 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
915 objset_t *os = dd->dd_pool->dp_meta_objset;
917 dsl_dir_zapify(dd, tx);
918 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
919 sizeof (cnt), 1, &cnt, tx));
920 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
921 sizeof (cnt), 1, &cnt, tx));
924 dsl_dir_rele(dd, FTAG);
927 * If we are creating a clone, make sure we zero out any stale
928 * data from the origin snapshots zil header.
930 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
933 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
934 dsl_dataset_zero_zil(ds, tx);
935 dsl_dataset_rele(ds, FTAG);
942 /* FreeBSD ioctl compat begin */
945 const char *snapname;
949 dsl_check_snap_cb(const char *name, void *arg)
951 struct destroyarg *da = arg;
955 dsname = kmem_asprintf("%s@%s", name, da->snapname);
956 fnvlist_add_boolean(da->nvl, dsname);
957 kmem_free(dsname, strlen(dsname) + 1);
963 dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
966 struct destroyarg *da;
969 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP);
971 da->snapname = snapname;
972 err = dmu_objset_find(fsname, dsl_check_snap_cb, da,
974 kmem_free(da, sizeof (struct destroyarg));
978 /* FreeBSD ioctl compat end */
979 #endif /* __FreeBSD__ */
982 * The unique space in the head dataset can be calculated by subtracting
983 * the space used in the most recent snapshot, that is still being used
984 * in this file system, from the space currently in use. To figure out
985 * the space in the most recent snapshot still in use, we need to take
986 * the total space used in the snapshot and subtract out the space that
987 * has been freed up since the snapshot was taken.
990 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
993 uint64_t dlused, dlcomp, dluncomp;
995 ASSERT(!ds->ds_is_snapshot);
997 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
998 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
1002 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
1004 ASSERT3U(dlused, <=, mrs_used);
1005 dsl_dataset_phys(ds)->ds_unique_bytes =
1006 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1008 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1009 SPA_VERSION_UNIQUE_ACCURATE)
1010 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1014 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1017 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1021 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1022 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1025 * The err should not be ENOENT, but a bug in a previous version
1026 * of the code could cause upgrade_clones_cb() to not set
1027 * ds_next_snap_obj when it should, leading to a missing entry.
1028 * If we knew that the pool was created after
1029 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1030 * ENOENT. However, at least we can check that we don't have
1031 * too many entries in the next_clones_obj even after failing to
1036 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1038 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1043 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1045 return (&dsl_dataset_phys(ds)->ds_bp);
1049 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
1051 ASSERT(dmu_tx_is_syncing(tx));
1052 /* If it's the meta-objset, set dp_meta_rootbp */
1054 tx->tx_pool->dp_meta_rootbp = *bp;
1056 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1057 dsl_dataset_phys(ds)->ds_bp = *bp;
1062 dsl_dataset_get_spa(dsl_dataset_t *ds)
1064 return (ds->ds_dir->dd_pool->dp_spa);
1068 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1072 if (ds == NULL) /* this is the meta-objset */
1075 ASSERT(ds->ds_objset != NULL);
1077 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1078 panic("dirtying snapshot!");
1080 dp = ds->ds_dir->dd_pool;
1082 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1083 /* up the hold count until we can be written out */
1084 dmu_buf_add_ref(ds->ds_dbuf, ds);
1089 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1091 for (int t = 0; t < TXG_SIZE; t++) {
1092 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1100 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1104 if (!dmu_tx_is_syncing(tx))
1108 * If there's an fs-only reservation, any blocks that might become
1109 * owned by the snapshot dataset must be accommodated by space
1110 * outside of the reservation.
1112 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1113 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1114 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1115 return (SET_ERROR(ENOSPC));
1118 * Propagate any reserved space for this snapshot to other
1119 * snapshot checks in this sync group.
1122 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1127 typedef struct dsl_dataset_snapshot_arg {
1128 nvlist_t *ddsa_snaps;
1129 nvlist_t *ddsa_props;
1130 nvlist_t *ddsa_errors;
1132 } dsl_dataset_snapshot_arg_t;
1135 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1136 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1141 ds->ds_trysnap_txg = tx->tx_txg;
1143 if (!dmu_tx_is_syncing(tx))
1147 * We don't allow multiple snapshots of the same txg. If there
1148 * is already one, try again.
1150 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1151 return (SET_ERROR(EAGAIN));
1154 * Check for conflicting snapshot name.
1156 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1158 return (SET_ERROR(EEXIST));
1159 if (error != ENOENT)
1163 * We don't allow taking snapshots of inconsistent datasets, such as
1164 * those into which we are currently receiving. However, if we are
1165 * creating this snapshot as part of a receive, this check will be
1166 * executed atomically with respect to the completion of the receive
1167 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1168 * case we ignore this, knowing it will be fixed up for us shortly in
1169 * dmu_recv_end_sync().
1171 if (!recv && DS_IS_INCONSISTENT(ds))
1172 return (SET_ERROR(EBUSY));
1175 * Skip the check for temporary snapshots or if we have already checked
1176 * the counts in dsl_dataset_snapshot_check. This means we really only
1177 * check the count here when we're receiving a stream.
1179 if (cnt != 0 && cr != NULL) {
1180 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1181 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1186 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1194 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1196 dsl_dataset_snapshot_arg_t *ddsa = arg;
1197 dsl_pool_t *dp = dmu_tx_pool(tx);
1202 * Pre-compute how many total new snapshots will be created for each
1203 * level in the tree and below. This is needed for validating the
1204 * snapshot limit when either taking a recursive snapshot or when
1205 * taking multiple snapshots.
1207 * The problem is that the counts are not actually adjusted when
1208 * we are checking, only when we finally sync. For a single snapshot,
1209 * this is easy, the count will increase by 1 at each node up the tree,
1210 * but its more complicated for the recursive/multiple snapshot case.
1212 * The dsl_fs_ss_limit_check function does recursively check the count
1213 * at each level up the tree but since it is validating each snapshot
1214 * independently we need to be sure that we are validating the complete
1215 * count for the entire set of snapshots. We do this by rolling up the
1216 * counts for each component of the name into an nvlist and then
1217 * checking each of those cases with the aggregated count.
1219 * This approach properly handles not only the recursive snapshot
1220 * case (where we get all of those on the ddsa_snaps list) but also
1221 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1222 * validate the limit on 'a' using a count of 2).
1224 * We validate the snapshot names in the third loop and only report
1227 if (dmu_tx_is_syncing(tx)) {
1228 nvlist_t *cnt_track = NULL;
1229 cnt_track = fnvlist_alloc();
1231 /* Rollup aggregated counts into the cnt_track list */
1232 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1234 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1237 char nm[MAXPATHLEN];
1239 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1240 pdelim = strchr(nm, '@');
1246 if (nvlist_lookup_uint64(cnt_track, nm,
1248 /* update existing entry */
1249 fnvlist_add_uint64(cnt_track, nm,
1253 fnvlist_add_uint64(cnt_track, nm, 1);
1256 pdelim = strrchr(nm, '/');
1259 } while (pdelim != NULL);
1262 /* Check aggregated counts at each level */
1263 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1264 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1270 name = nvpair_name(pair);
1271 cnt = fnvpair_value_uint64(pair);
1274 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1276 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1277 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1279 dsl_dataset_rele(ds, FTAG);
1283 if (ddsa->ddsa_errors != NULL)
1284 fnvlist_add_int32(ddsa->ddsa_errors,
1287 /* only report one error for this check */
1291 nvlist_free(cnt_track);
1294 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1295 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1299 char dsname[MAXNAMELEN];
1301 name = nvpair_name(pair);
1302 if (strlen(name) >= MAXNAMELEN)
1303 error = SET_ERROR(ENAMETOOLONG);
1305 atp = strchr(name, '@');
1307 error = SET_ERROR(EINVAL);
1309 (void) strlcpy(dsname, name, atp - name + 1);
1312 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1314 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1315 error = dsl_dataset_snapshot_check_impl(ds,
1316 atp + 1, tx, B_FALSE, 0, NULL);
1317 dsl_dataset_rele(ds, FTAG);
1321 if (ddsa->ddsa_errors != NULL) {
1322 fnvlist_add_int32(ddsa->ddsa_errors,
1333 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1336 static zil_header_t zero_zil;
1338 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1340 dsl_dataset_phys_t *dsphys;
1341 uint64_t dsobj, crtxg;
1342 objset_t *mos = dp->dp_meta_objset;
1345 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1348 * If we are on an old pool, the zil must not be active, in which
1349 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1351 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1352 dmu_objset_from_ds(ds, &os) != 0 ||
1353 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1354 sizeof (zero_zil)) == 0);
1356 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1359 * The origin's ds_creation_txg has to be < TXG_INITIAL
1361 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1366 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1367 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1368 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1369 dmu_buf_will_dirty(dbuf, tx);
1370 dsphys = dbuf->db_data;
1371 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1372 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1373 dsphys->ds_fsid_guid = unique_create();
1375 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1376 sizeof (dsphys->ds_guid));
1377 } while (dsphys->ds_guid == 0);
1378 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1379 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1380 dsphys->ds_next_snap_obj = ds->ds_object;
1381 dsphys->ds_num_children = 1;
1382 dsphys->ds_creation_time = gethrestime_sec();
1383 dsphys->ds_creation_txg = crtxg;
1384 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1385 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1386 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1387 dsphys->ds_uncompressed_bytes =
1388 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1389 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1390 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1391 dmu_buf_rele(dbuf, FTAG);
1393 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1394 if (ds->ds_feature_inuse[f])
1395 dsl_dataset_activate_feature(dsobj, f, tx);
1398 ASSERT3U(ds->ds_prev != 0, ==,
1399 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1401 uint64_t next_clones_obj =
1402 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1403 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1405 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1406 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1408 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1409 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1410 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1411 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1412 } else if (next_clones_obj != 0) {
1413 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1414 dsphys->ds_next_snap_obj, tx);
1415 VERIFY0(zap_add_int(mos,
1416 next_clones_obj, dsobj, tx));
1421 * If we have a reference-reservation on this dataset, we will
1422 * need to increase the amount of refreservation being charged
1423 * since our unique space is going to zero.
1425 if (ds->ds_reserved) {
1427 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1428 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1430 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1434 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1435 dsl_dataset_phys(ds)->ds_deadlist_obj =
1436 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1437 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1438 dsl_deadlist_close(&ds->ds_deadlist);
1439 dsl_deadlist_open(&ds->ds_deadlist, mos,
1440 dsl_dataset_phys(ds)->ds_deadlist_obj);
1441 dsl_deadlist_add_key(&ds->ds_deadlist,
1442 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1444 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1445 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1446 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1447 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1448 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1449 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1451 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1452 snapname, 8, 1, &dsobj, tx));
1455 dsl_dataset_rele(ds->ds_prev, ds);
1456 VERIFY0(dsl_dataset_hold_obj(dp,
1457 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1459 dsl_scan_ds_snapshotted(ds, tx);
1461 dsl_dir_snap_cmtime_update(ds->ds_dir);
1463 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1467 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1469 dsl_dataset_snapshot_arg_t *ddsa = arg;
1470 dsl_pool_t *dp = dmu_tx_pool(tx);
1473 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1474 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1477 char dsname[MAXNAMELEN];
1479 name = nvpair_name(pair);
1480 atp = strchr(name, '@');
1481 (void) strlcpy(dsname, name, atp - name + 1);
1482 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1484 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1485 if (ddsa->ddsa_props != NULL) {
1486 dsl_props_set_sync_impl(ds->ds_prev,
1487 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1489 dsl_dataset_rele(ds, FTAG);
1494 * The snapshots must all be in the same pool.
1495 * All-or-nothing: if there are any failures, nothing will be modified.
1498 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1500 dsl_dataset_snapshot_arg_t ddsa;
1502 boolean_t needsuspend;
1506 nvlist_t *suspended = NULL;
1508 pair = nvlist_next_nvpair(snaps, NULL);
1511 firstname = nvpair_name(pair);
1513 error = spa_open(firstname, &spa, FTAG);
1516 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1517 spa_close(spa, FTAG);
1520 suspended = fnvlist_alloc();
1521 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1522 pair = nvlist_next_nvpair(snaps, pair)) {
1523 char fsname[MAXNAMELEN];
1524 char *snapname = nvpair_name(pair);
1528 atp = strchr(snapname, '@');
1530 error = SET_ERROR(EINVAL);
1533 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1535 error = zil_suspend(fsname, &cookie);
1538 fnvlist_add_uint64(suspended, fsname,
1543 ddsa.ddsa_snaps = snaps;
1544 ddsa.ddsa_props = props;
1545 ddsa.ddsa_errors = errors;
1546 ddsa.ddsa_cr = CRED();
1549 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1550 dsl_dataset_snapshot_sync, &ddsa,
1551 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1554 if (suspended != NULL) {
1555 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1556 pair = nvlist_next_nvpair(suspended, pair)) {
1557 zil_resume((void *)(uintptr_t)
1558 fnvpair_value_uint64(pair));
1560 fnvlist_free(suspended);
1566 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1567 pair = nvlist_next_nvpair(snaps, pair)) {
1568 char *snapname = nvpair_name(pair);
1569 zvol_create_minors(snapname);
1577 typedef struct dsl_dataset_snapshot_tmp_arg {
1578 const char *ddsta_fsname;
1579 const char *ddsta_snapname;
1580 minor_t ddsta_cleanup_minor;
1581 const char *ddsta_htag;
1582 } dsl_dataset_snapshot_tmp_arg_t;
1585 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1587 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1588 dsl_pool_t *dp = dmu_tx_pool(tx);
1592 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1596 /* NULL cred means no limit check for tmp snapshot */
1597 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1598 tx, B_FALSE, 0, NULL);
1600 dsl_dataset_rele(ds, FTAG);
1604 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1605 dsl_dataset_rele(ds, FTAG);
1606 return (SET_ERROR(ENOTSUP));
1608 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1611 dsl_dataset_rele(ds, FTAG);
1615 dsl_dataset_rele(ds, FTAG);
1620 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1622 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1623 dsl_pool_t *dp = dmu_tx_pool(tx);
1626 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1628 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1629 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1630 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1631 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1633 dsl_dataset_rele(ds, FTAG);
1637 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1638 minor_t cleanup_minor, const char *htag)
1640 dsl_dataset_snapshot_tmp_arg_t ddsta;
1643 boolean_t needsuspend;
1646 ddsta.ddsta_fsname = fsname;
1647 ddsta.ddsta_snapname = snapname;
1648 ddsta.ddsta_cleanup_minor = cleanup_minor;
1649 ddsta.ddsta_htag = htag;
1651 error = spa_open(fsname, &spa, FTAG);
1654 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1655 spa_close(spa, FTAG);
1658 error = zil_suspend(fsname, &cookie);
1663 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1664 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1673 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1675 ASSERT(dmu_tx_is_syncing(tx));
1676 ASSERT(ds->ds_objset != NULL);
1677 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1680 * in case we had to change ds_fsid_guid when we opened it,
1683 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1684 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1686 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1687 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1688 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1689 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1690 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1691 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1692 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1693 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1694 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1695 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1696 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1697 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1698 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1701 dmu_objset_sync(ds->ds_objset, zio, tx);
1703 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1704 if (ds->ds_feature_activation_needed[f]) {
1705 if (ds->ds_feature_inuse[f])
1707 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1708 ds->ds_feature_inuse[f] = B_TRUE;
1714 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1717 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1720 nvlist_t *propval = fnvlist_alloc();
1721 nvlist_t *val = fnvlist_alloc();
1723 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1726 * There may be missing entries in ds_next_clones_obj
1727 * due to a bug in a previous version of the code.
1728 * Only trust it if it has the right number of entries.
1730 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1731 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1734 if (count != dsl_dataset_phys(ds)->ds_num_children - 1)
1736 for (zap_cursor_init(&zc, mos,
1737 dsl_dataset_phys(ds)->ds_next_clones_obj);
1738 zap_cursor_retrieve(&zc, &za) == 0;
1739 zap_cursor_advance(&zc)) {
1740 dsl_dataset_t *clone;
1741 char buf[ZFS_MAXNAMELEN];
1742 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1743 za.za_first_integer, FTAG, &clone));
1744 dsl_dir_name(clone->ds_dir, buf);
1745 fnvlist_add_boolean(val, buf);
1746 dsl_dataset_rele(clone, FTAG);
1748 zap_cursor_fini(&zc);
1749 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1750 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval);
1753 nvlist_free(propval);
1757 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1759 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1761 if (dsl_dataset_has_resume_receive_state(ds)) {
1764 uint8_t *compressed;
1766 nvlist_t *token_nv = fnvlist_alloc();
1767 size_t packed_size, compressed_size;
1769 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1770 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1771 fnvlist_add_uint64(token_nv, "fromguid", val);
1773 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1774 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1775 fnvlist_add_uint64(token_nv, "object", val);
1777 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1778 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1779 fnvlist_add_uint64(token_nv, "offset", val);
1781 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1782 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1783 fnvlist_add_uint64(token_nv, "bytes", val);
1785 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1786 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1787 fnvlist_add_uint64(token_nv, "toguid", val);
1790 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1791 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1792 fnvlist_add_string(token_nv, "toname", buf);
1794 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1795 DS_FIELD_RESUME_EMBEDOK) == 0) {
1796 fnvlist_add_boolean(token_nv, "embedok");
1798 packed = fnvlist_pack(token_nv, &packed_size);
1799 fnvlist_free(token_nv);
1800 compressed = kmem_alloc(packed_size, KM_SLEEP);
1802 compressed_size = gzip_compress(packed, compressed,
1803 packed_size, packed_size, 6);
1806 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1808 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1809 for (int i = 0; i < compressed_size; i++) {
1810 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1812 str[compressed_size * 2] = '\0';
1813 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1814 ZFS_SEND_RESUME_TOKEN_VERSION,
1815 (longlong_t)cksum.zc_word[0],
1816 (longlong_t)packed_size, str);
1817 dsl_prop_nvlist_add_string(nv,
1818 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1819 kmem_free(packed, packed_size);
1820 kmem_free(str, compressed_size * 2 + 1);
1821 kmem_free(compressed, packed_size);
1827 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
1829 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1830 uint64_t refd, avail, uobjs, aobjs, ratio;
1832 ASSERT(dsl_pool_config_held(dp));
1834 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1835 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1836 dsl_dataset_phys(ds)->ds_compressed_bytes);
1838 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
1839 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
1840 dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1842 if (ds->ds_is_snapshot) {
1843 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
1844 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
1845 dsl_dataset_phys(ds)->ds_unique_bytes);
1846 get_clones_stat(ds, nv);
1848 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
1849 char buf[MAXNAMELEN];
1850 dsl_dataset_name(ds->ds_prev, buf);
1851 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
1854 dsl_dir_stats(ds->ds_dir, nv);
1857 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs);
1858 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail);
1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd);
1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
1862 dsl_dataset_phys(ds)->ds_creation_time);
1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
1864 dsl_dataset_phys(ds)->ds_creation_txg);
1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
1870 dsl_dataset_phys(ds)->ds_guid);
1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
1872 dsl_dataset_phys(ds)->ds_unique_bytes);
1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
1875 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
1877 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
1878 DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
1880 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
1881 uint64_t written, comp, uncomp;
1882 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1883 dsl_dataset_t *prev;
1885 int err = dsl_dataset_hold_obj(dp,
1886 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1888 err = dsl_dataset_space_written(prev, ds, &written,
1890 dsl_dataset_rele(prev, FTAG);
1892 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
1898 if (!dsl_dataset_is_snapshot(ds)) {
1900 * A failed "newfs" (e.g. full) resumable receive leaves
1901 * the stats set on this dataset. Check here for the prop.
1903 get_receive_resume_stats(ds, nv);
1906 * A failed incremental resumable receive leaves the
1907 * stats set on our child named "%recv". Check the child
1910 char recvname[ZFS_MAXNAMELEN];
1911 dsl_dataset_t *recv_ds;
1912 dsl_dataset_name(ds, recvname);
1913 (void) strcat(recvname, "/");
1914 (void) strcat(recvname, recv_clone_name);
1915 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
1916 get_receive_resume_stats(recv_ds, nv);
1917 dsl_dataset_rele(recv_ds, FTAG);
1923 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
1925 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1926 ASSERT(dsl_pool_config_held(dp));
1928 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg;
1929 stat->dds_inconsistent =
1930 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT;
1931 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid;
1932 stat->dds_origin[0] = '\0';
1933 if (ds->ds_is_snapshot) {
1934 stat->dds_is_snapshot = B_TRUE;
1935 stat->dds_num_clones =
1936 dsl_dataset_phys(ds)->ds_num_children - 1;
1938 stat->dds_is_snapshot = B_FALSE;
1939 stat->dds_num_clones = 0;
1941 if (dsl_dir_is_clone(ds->ds_dir)) {
1944 VERIFY0(dsl_dataset_hold_obj(dp,
1945 dsl_dir_phys(ds->ds_dir)->dd_origin_obj,
1947 dsl_dataset_name(ods, stat->dds_origin);
1948 dsl_dataset_rele(ods, FTAG);
1954 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
1956 return (ds->ds_fsid_guid);
1960 dsl_dataset_space(dsl_dataset_t *ds,
1961 uint64_t *refdbytesp, uint64_t *availbytesp,
1962 uint64_t *usedobjsp, uint64_t *availobjsp)
1964 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
1965 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
1966 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
1968 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
1969 if (ds->ds_quota != 0) {
1971 * Adjust available bytes according to refquota
1973 if (*refdbytesp < ds->ds_quota)
1974 *availbytesp = MIN(*availbytesp,
1975 ds->ds_quota - *refdbytesp);
1979 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
1980 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
1984 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
1986 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1988 ASSERT(dsl_pool_config_held(dp));
1991 if (dsl_dataset_phys(ds)->ds_bp.blk_birth >
1992 dsl_dataset_phys(snap)->ds_creation_txg) {
1993 objset_t *os, *os_snap;
1995 * It may be that only the ZIL differs, because it was
1996 * reset in the head. Don't count that as being
1999 if (dmu_objset_from_ds(ds, &os) != 0)
2001 if (dmu_objset_from_ds(snap, &os_snap) != 0)
2003 return (bcmp(&os->os_phys->os_meta_dnode,
2004 &os_snap->os_phys->os_meta_dnode,
2005 sizeof (os->os_phys->os_meta_dnode)) != 0);
2010 typedef struct dsl_dataset_rename_snapshot_arg {
2011 const char *ddrsa_fsname;
2012 const char *ddrsa_oldsnapname;
2013 const char *ddrsa_newsnapname;
2014 boolean_t ddrsa_recursive;
2016 } dsl_dataset_rename_snapshot_arg_t;
2020 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2021 dsl_dataset_t *hds, void *arg)
2023 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2027 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2029 /* ignore nonexistent snapshots */
2030 return (error == ENOENT ? 0 : error);
2033 /* new name should not exist */
2034 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2036 error = SET_ERROR(EEXIST);
2037 else if (error == ENOENT)
2040 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2041 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2042 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN)
2043 error = SET_ERROR(ENAMETOOLONG);
2049 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2051 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2052 dsl_pool_t *dp = dmu_tx_pool(tx);
2056 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2060 if (ddrsa->ddrsa_recursive) {
2061 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2062 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2065 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2067 dsl_dataset_rele(hds, FTAG);
2072 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2073 dsl_dataset_t *hds, void *arg)
2077 char *oldname, *newname;
2080 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2083 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2086 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2087 ASSERT(error == 0 || error == ENOENT);
2088 if (error == ENOENT) {
2089 /* ignore nonexistent snapshots */
2093 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2095 /* log before we change the name */
2096 spa_history_log_internal_ds(ds, "rename", tx,
2097 "-> @%s", ddrsa->ddrsa_newsnapname);
2099 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2101 mutex_enter(&ds->ds_lock);
2102 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2103 mutex_exit(&ds->ds_lock);
2104 VERIFY0(zap_add(dp->dp_meta_objset,
2105 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2106 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2110 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2111 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2112 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2113 ddrsa->ddrsa_oldsnapname);
2114 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2115 ddrsa->ddrsa_newsnapname);
2116 zfsvfs_update_fromname(oldname, newname);
2117 zvol_rename_minors(oldname, newname);
2118 kmem_free(newname, MAXPATHLEN);
2119 kmem_free(oldname, MAXPATHLEN);
2122 dsl_dataset_rele(ds, FTAG);
2128 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2130 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2131 dsl_pool_t *dp = dmu_tx_pool(tx);
2134 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2135 ddrsa->ddrsa_tx = tx;
2136 if (ddrsa->ddrsa_recursive) {
2137 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2138 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2141 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2143 dsl_dataset_rele(hds, FTAG);
2147 dsl_dataset_rename_snapshot(const char *fsname,
2148 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2150 dsl_dataset_rename_snapshot_arg_t ddrsa;
2152 ddrsa.ddrsa_fsname = fsname;
2153 ddrsa.ddrsa_oldsnapname = oldsnapname;
2154 ddrsa.ddrsa_newsnapname = newsnapname;
2155 ddrsa.ddrsa_recursive = recursive;
2157 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2158 dsl_dataset_rename_snapshot_sync, &ddrsa,
2159 1, ZFS_SPACE_CHECK_RESERVED));
2163 * If we're doing an ownership handoff, we need to make sure that there is
2164 * only one long hold on the dataset. We're not allowed to change anything here
2165 * so we don't permanently release the long hold or regular hold here. We want
2166 * to do this only when syncing to avoid the dataset unexpectedly going away
2167 * when we release the long hold.
2170 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2174 if (!dmu_tx_is_syncing(tx))
2177 if (owner != NULL) {
2178 VERIFY3P(ds->ds_owner, ==, owner);
2179 dsl_dataset_long_rele(ds, owner);
2182 held = dsl_dataset_long_held(ds);
2185 dsl_dataset_long_hold(ds, owner);
2188 return (SET_ERROR(EBUSY));
2193 typedef struct dsl_dataset_rollback_arg {
2194 const char *ddra_fsname;
2196 nvlist_t *ddra_result;
2197 } dsl_dataset_rollback_arg_t;
2200 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2202 dsl_dataset_rollback_arg_t *ddra = arg;
2203 dsl_pool_t *dp = dmu_tx_pool(tx);
2205 int64_t unused_refres_delta;
2208 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2212 /* must not be a snapshot */
2213 if (ds->ds_is_snapshot) {
2214 dsl_dataset_rele(ds, FTAG);
2215 return (SET_ERROR(EINVAL));
2218 /* must have a most recent snapshot */
2219 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2220 dsl_dataset_rele(ds, FTAG);
2221 return (SET_ERROR(EINVAL));
2224 /* must not have any bookmarks after the most recent snapshot */
2225 nvlist_t *proprequest = fnvlist_alloc();
2226 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2227 nvlist_t *bookmarks = fnvlist_alloc();
2228 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2229 fnvlist_free(proprequest);
2232 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2233 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2235 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2236 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2237 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2238 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2239 fnvlist_free(bookmarks);
2240 dsl_dataset_rele(ds, FTAG);
2241 return (SET_ERROR(EEXIST));
2244 fnvlist_free(bookmarks);
2246 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2248 dsl_dataset_rele(ds, FTAG);
2253 * Check if the snap we are rolling back to uses more than
2256 if (ds->ds_quota != 0 &&
2257 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2258 dsl_dataset_rele(ds, FTAG);
2259 return (SET_ERROR(EDQUOT));
2263 * When we do the clone swap, we will temporarily use more space
2264 * due to the refreservation (the head will no longer have any
2265 * unique space, so the entire amount of the refreservation will need
2266 * to be free). We will immediately destroy the clone, freeing
2267 * this space, but the freeing happens over many txg's.
2269 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2270 dsl_dataset_phys(ds)->ds_unique_bytes);
2272 if (unused_refres_delta > 0 &&
2273 unused_refres_delta >
2274 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2275 dsl_dataset_rele(ds, FTAG);
2276 return (SET_ERROR(ENOSPC));
2279 dsl_dataset_rele(ds, FTAG);
2284 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2286 dsl_dataset_rollback_arg_t *ddra = arg;
2287 dsl_pool_t *dp = dmu_tx_pool(tx);
2288 dsl_dataset_t *ds, *clone;
2290 char namebuf[ZFS_MAXNAMELEN];
2292 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2294 dsl_dataset_name(ds->ds_prev, namebuf);
2295 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2297 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2298 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2300 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2302 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2303 dsl_dataset_zero_zil(ds, tx);
2305 dsl_destroy_head_sync_impl(clone, tx);
2307 dsl_dataset_rele(clone, FTAG);
2308 dsl_dataset_rele(ds, FTAG);
2312 * Rolls back the given filesystem or volume to the most recent snapshot.
2313 * The name of the most recent snapshot will be returned under key "target"
2314 * in the result nvlist.
2317 * - The existing dataset MUST be owned by the specified owner at entry
2318 * - Upon return, dataset will still be held by the same owner, whether we
2321 * This mode is required any time the existing filesystem is mounted. See
2322 * notes above zfs_suspend_fs() for further details.
2325 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
2327 dsl_dataset_rollback_arg_t ddra;
2329 ddra.ddra_fsname = fsname;
2330 ddra.ddra_owner = owner;
2331 ddra.ddra_result = result;
2333 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2334 dsl_dataset_rollback_sync, &ddra,
2335 1, ZFS_SPACE_CHECK_RESERVED));
2338 struct promotenode {
2343 typedef struct dsl_dataset_promote_arg {
2344 const char *ddpa_clonename;
2345 dsl_dataset_t *ddpa_clone;
2346 list_t shared_snaps, origin_snaps, clone_snaps;
2347 dsl_dataset_t *origin_origin; /* origin of the origin */
2348 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap;
2351 } dsl_dataset_promote_arg_t;
2353 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2354 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2356 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2359 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2361 dsl_dataset_promote_arg_t *ddpa = arg;
2362 dsl_pool_t *dp = dmu_tx_pool(tx);
2364 struct promotenode *snap;
2365 dsl_dataset_t *origin_ds;
2369 size_t max_snap_len;
2371 err = promote_hold(ddpa, dp, FTAG);
2375 hds = ddpa->ddpa_clone;
2376 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2378 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2379 promote_rele(ddpa, FTAG);
2380 return (SET_ERROR(EXDEV));
2384 * Compute and check the amount of space to transfer. Since this is
2385 * so expensive, don't do the preliminary check.
2387 if (!dmu_tx_is_syncing(tx)) {
2388 promote_rele(ddpa, FTAG);
2392 snap = list_head(&ddpa->shared_snaps);
2393 origin_ds = snap->ds;
2395 /* compute origin's new unique space */
2396 snap = list_tail(&ddpa->clone_snaps);
2397 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2398 origin_ds->ds_object);
2399 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2400 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2401 &ddpa->unique, &unused, &unused);
2404 * Walk the snapshots that we are moving
2406 * Compute space to transfer. Consider the incremental changes
2407 * to used by each snapshot:
2408 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2409 * So each snapshot gave birth to:
2410 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2411 * So a sequence would look like:
2412 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2413 * Which simplifies to:
2414 * uN + kN + kN-1 + ... + k1 + k0
2415 * Note however, if we stop before we reach the ORIGIN we get:
2416 * uN + kN + kN-1 + ... + kM - uM-1
2419 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2420 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2421 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2422 for (snap = list_head(&ddpa->shared_snaps); snap;
2423 snap = list_next(&ddpa->shared_snaps, snap)) {
2424 uint64_t val, dlused, dlcomp, dluncomp;
2425 dsl_dataset_t *ds = snap->ds;
2430 * If there are long holds, we won't be able to evict
2433 if (dsl_dataset_long_held(ds)) {
2434 err = SET_ERROR(EBUSY);
2438 /* Check that the snapshot name does not conflict */
2439 VERIFY0(dsl_dataset_get_snapname(ds));
2440 if (strlen(ds->ds_snapname) >= max_snap_len) {
2441 err = SET_ERROR(ENAMETOOLONG);
2444 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2446 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname);
2447 err = SET_ERROR(EEXIST);
2453 /* The very first snapshot does not have a deadlist */
2454 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2457 dsl_deadlist_space(&ds->ds_deadlist,
2458 &dlused, &dlcomp, &dluncomp);
2459 ddpa->used += dlused;
2460 ddpa->comp += dlcomp;
2461 ddpa->uncomp += dluncomp;
2465 * If we are a clone of a clone then we never reached ORIGIN,
2466 * so we need to subtract out the clone origin's used space.
2468 if (ddpa->origin_origin) {
2470 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2472 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2474 dsl_dataset_phys(ddpa->origin_origin)->
2475 ds_uncompressed_bytes;
2478 /* Check that there is enough space and limit headroom here */
2479 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2480 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2485 * Compute the amounts of space that will be used by snapshots
2486 * after the promotion (for both origin and clone). For each,
2487 * it is the amount of space that will be on all of their
2488 * deadlists (that was not born before their new origin).
2490 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2494 * Note, typically this will not be a clone of a clone,
2495 * so dd_origin_txg will be < TXG_INITIAL, so
2496 * these snaplist_space() -> dsl_deadlist_space_range()
2497 * calls will be fast because they do not have to
2498 * iterate over all bps.
2500 snap = list_head(&ddpa->origin_snaps);
2501 err = snaplist_space(&ddpa->shared_snaps,
2502 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2506 err = snaplist_space(&ddpa->clone_snaps,
2507 snap->ds->ds_dir->dd_origin_txg, &space);
2510 ddpa->cloneusedsnap += space;
2512 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2513 DD_FLAG_USED_BREAKDOWN) {
2514 err = snaplist_space(&ddpa->origin_snaps,
2515 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2516 &ddpa->originusedsnap);
2522 promote_rele(ddpa, FTAG);
2527 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2529 dsl_dataset_promote_arg_t *ddpa = arg;
2530 dsl_pool_t *dp = dmu_tx_pool(tx);
2532 struct promotenode *snap;
2533 dsl_dataset_t *origin_ds;
2534 dsl_dataset_t *origin_head;
2536 dsl_dir_t *odd = NULL;
2537 uint64_t oldnext_obj;
2539 #if defined(__FreeBSD__) && defined(_KERNEL)
2540 char *oldname, *newname;
2543 VERIFY0(promote_hold(ddpa, dp, FTAG));
2544 hds = ddpa->ddpa_clone;
2546 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2548 snap = list_head(&ddpa->shared_snaps);
2549 origin_ds = snap->ds;
2552 snap = list_head(&ddpa->origin_snaps);
2553 origin_head = snap->ds;
2556 * We need to explicitly open odd, since origin_ds's dd will be
2559 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2562 /* change origin's next snap */
2563 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2564 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2565 snap = list_tail(&ddpa->clone_snaps);
2566 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2567 origin_ds->ds_object);
2568 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2570 /* change the origin's next clone */
2571 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2572 dsl_dataset_remove_from_next_clones(origin_ds,
2573 snap->ds->ds_object, tx);
2574 VERIFY0(zap_add_int(dp->dp_meta_objset,
2575 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2580 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2581 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2582 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2583 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2584 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2585 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2586 origin_head->ds_dir->dd_origin_txg =
2587 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2589 /* change dd_clone entries */
2590 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2591 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2592 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2593 VERIFY0(zap_add_int(dp->dp_meta_objset,
2594 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2595 hds->ds_object, tx));
2597 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2598 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2599 origin_head->ds_object, tx));
2600 if (dsl_dir_phys(dd)->dd_clones == 0) {
2601 dsl_dir_phys(dd)->dd_clones =
2602 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
2603 DMU_OT_NONE, 0, tx);
2605 VERIFY0(zap_add_int(dp->dp_meta_objset,
2606 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
2609 #if defined(__FreeBSD__) && defined(_KERNEL)
2610 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */
2611 mutex_enter(&spa_namespace_lock);
2613 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2614 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2617 /* move snapshots to this dir */
2618 for (snap = list_head(&ddpa->shared_snaps); snap;
2619 snap = list_next(&ddpa->shared_snaps, snap)) {
2620 dsl_dataset_t *ds = snap->ds;
2623 * Property callbacks are registered to a particular
2624 * dsl_dir. Since ours is changing, evict the objset
2625 * so that they will be unregistered from the old dsl_dir.
2627 if (ds->ds_objset) {
2628 dmu_objset_evict(ds->ds_objset);
2629 ds->ds_objset = NULL;
2632 /* move snap name entry */
2633 VERIFY0(dsl_dataset_get_snapname(ds));
2634 VERIFY0(dsl_dataset_snap_remove(origin_head,
2635 ds->ds_snapname, tx, B_TRUE));
2636 VERIFY0(zap_add(dp->dp_meta_objset,
2637 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
2638 8, 1, &ds->ds_object, tx));
2639 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
2640 DD_FIELD_SNAPSHOT_COUNT, tx);
2642 /* change containing dsl_dir */
2643 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2644 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
2645 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
2646 ASSERT3P(ds->ds_dir, ==, odd);
2647 dsl_dir_rele(ds->ds_dir, ds);
2648 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
2649 NULL, ds, &ds->ds_dir));
2651 #if defined(__FreeBSD__) && defined(_KERNEL)
2652 dsl_dataset_name(ds, newname);
2653 zfsvfs_update_fromname(oldname, newname);
2654 zvol_rename_minors(oldname, newname);
2657 /* move any clone references */
2658 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
2659 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2663 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2664 dsl_dataset_phys(ds)->ds_next_clones_obj);
2665 zap_cursor_retrieve(&zc, &za) == 0;
2666 zap_cursor_advance(&zc)) {
2667 dsl_dataset_t *cnds;
2670 if (za.za_first_integer == oldnext_obj) {
2672 * We've already moved the
2673 * origin's reference.
2678 VERIFY0(dsl_dataset_hold_obj(dp,
2679 za.za_first_integer, FTAG, &cnds));
2680 o = dsl_dir_phys(cnds->ds_dir)->
2681 dd_head_dataset_obj;
2683 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2684 dsl_dir_phys(odd)->dd_clones, o, tx));
2685 VERIFY0(zap_add_int(dp->dp_meta_objset,
2686 dsl_dir_phys(dd)->dd_clones, o, tx));
2687 dsl_dataset_rele(cnds, FTAG);
2689 zap_cursor_fini(&zc);
2692 ASSERT(!dsl_prop_hascb(ds));
2695 #if defined(__FreeBSD__) && defined(_KERNEL)
2696 mutex_exit(&spa_namespace_lock);
2698 kmem_free(newname, MAXPATHLEN);
2699 kmem_free(oldname, MAXPATHLEN);
2702 * Change space accounting.
2703 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
2704 * both be valid, or both be 0 (resulting in delta == 0). This
2705 * is true for each of {clone,origin} independently.
2708 delta = ddpa->cloneusedsnap -
2709 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
2710 ASSERT3S(delta, >=, 0);
2711 ASSERT3U(ddpa->used, >=, delta);
2712 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
2713 dsl_dir_diduse_space(dd, DD_USED_HEAD,
2714 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
2716 delta = ddpa->originusedsnap -
2717 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
2718 ASSERT3S(delta, <=, 0);
2719 ASSERT3U(ddpa->used, >=, -delta);
2720 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
2721 dsl_dir_diduse_space(odd, DD_USED_HEAD,
2722 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
2724 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
2726 /* log history record */
2727 spa_history_log_internal_ds(hds, "promote", tx, "");
2729 dsl_dir_rele(odd, FTAG);
2730 promote_rele(ddpa, FTAG);
2734 * Make a list of dsl_dataset_t's for the snapshots between first_obj
2735 * (exclusive) and last_obj (inclusive). The list will be in reverse
2736 * order (last_obj will be the list_head()). If first_obj == 0, do all
2737 * snapshots back to this dataset's origin.
2740 snaplist_make(dsl_pool_t *dp,
2741 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
2743 uint64_t obj = last_obj;
2745 list_create(l, sizeof (struct promotenode),
2746 offsetof(struct promotenode, link));
2748 while (obj != first_obj) {
2750 struct promotenode *snap;
2753 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
2754 ASSERT(err != ENOENT);
2759 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
2761 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
2763 list_insert_tail(l, snap);
2764 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
2771 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
2773 struct promotenode *snap;
2776 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
2777 uint64_t used, comp, uncomp;
2778 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2779 mintxg, UINT64_MAX, &used, &comp, &uncomp);
2786 snaplist_destroy(list_t *l, void *tag)
2788 struct promotenode *snap;
2790 if (l == NULL || !list_link_active(&l->list_head))
2793 while ((snap = list_tail(l)) != NULL) {
2794 list_remove(l, snap);
2795 dsl_dataset_rele(snap->ds, tag);
2796 kmem_free(snap, sizeof (*snap));
2802 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
2806 struct promotenode *snap;
2808 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
2812 dd = ddpa->ddpa_clone->ds_dir;
2814 if (ddpa->ddpa_clone->ds_is_snapshot ||
2815 !dsl_dir_is_clone(dd)) {
2816 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2817 return (SET_ERROR(EINVAL));
2820 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
2821 &ddpa->shared_snaps, tag);
2825 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
2826 &ddpa->clone_snaps, tag);
2830 snap = list_head(&ddpa->shared_snaps);
2831 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
2832 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
2833 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
2834 &ddpa->origin_snaps, tag);
2838 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
2839 error = dsl_dataset_hold_obj(dp,
2840 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
2841 tag, &ddpa->origin_origin);
2847 promote_rele(ddpa, tag);
2852 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
2854 snaplist_destroy(&ddpa->shared_snaps, tag);
2855 snaplist_destroy(&ddpa->clone_snaps, tag);
2856 snaplist_destroy(&ddpa->origin_snaps, tag);
2857 if (ddpa->origin_origin != NULL)
2858 dsl_dataset_rele(ddpa->origin_origin, tag);
2859 dsl_dataset_rele(ddpa->ddpa_clone, tag);
2865 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
2866 * in with the name. (It must be at least MAXNAMELEN bytes long.)
2869 dsl_dataset_promote(const char *name, char *conflsnap)
2871 dsl_dataset_promote_arg_t ddpa = { 0 };
2877 * We will modify space proportional to the number of
2878 * snapshots. Compute numsnaps.
2880 error = dmu_objset_hold(name, FTAG, &os);
2883 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
2884 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
2886 dmu_objset_rele(os, FTAG);
2890 ddpa.ddpa_clonename = name;
2891 ddpa.err_ds = conflsnap;
2894 return (dsl_sync_task(name, dsl_dataset_promote_check,
2895 dsl_dataset_promote_sync, &ddpa,
2896 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED));
2900 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
2901 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
2904 * "slack" factor for received datasets with refquota set on them.
2905 * See the bottom of this function for details on its use.
2907 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
2908 int64_t unused_refres_delta;
2910 /* they should both be heads */
2911 if (clone->ds_is_snapshot ||
2912 origin_head->ds_is_snapshot)
2913 return (SET_ERROR(EINVAL));
2915 /* if we are not forcing, the branch point should be just before them */
2916 if (!force && clone->ds_prev != origin_head->ds_prev)
2917 return (SET_ERROR(EINVAL));
2919 /* clone should be the clone (unless they are unrelated) */
2920 if (clone->ds_prev != NULL &&
2921 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
2922 origin_head->ds_dir != clone->ds_prev->ds_dir)
2923 return (SET_ERROR(EINVAL));
2925 /* the clone should be a child of the origin */
2926 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
2927 return (SET_ERROR(EINVAL));
2929 /* origin_head shouldn't be modified unless 'force' */
2931 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
2932 return (SET_ERROR(ETXTBSY));
2934 /* origin_head should have no long holds (e.g. is not mounted) */
2935 if (dsl_dataset_handoff_check(origin_head, owner, tx))
2936 return (SET_ERROR(EBUSY));
2938 /* check amount of any unconsumed refreservation */
2939 unused_refres_delta =
2940 (int64_t)MIN(origin_head->ds_reserved,
2941 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
2942 (int64_t)MIN(origin_head->ds_reserved,
2943 dsl_dataset_phys(clone)->ds_unique_bytes);
2945 if (unused_refres_delta > 0 &&
2946 unused_refres_delta >
2947 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
2948 return (SET_ERROR(ENOSPC));
2951 * The clone can't be too much over the head's refquota.
2953 * To ensure that the entire refquota can be used, we allow one
2954 * transaction to exceed the the refquota. Therefore, this check
2955 * needs to also allow for the space referenced to be more than the
2956 * refquota. The maximum amount of space that one transaction can use
2957 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
2958 * overage ensures that we are able to receive a filesystem that
2959 * exceeds the refquota on the source system.
2961 * So that overage is the refquota_slack we use below.
2963 if (origin_head->ds_quota != 0 &&
2964 dsl_dataset_phys(clone)->ds_referenced_bytes >
2965 origin_head->ds_quota + refquota_slack)
2966 return (SET_ERROR(EDQUOT));
2972 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
2973 dsl_dataset_t *origin_head, dmu_tx_t *tx)
2975 dsl_pool_t *dp = dmu_tx_pool(tx);
2976 int64_t unused_refres_delta;
2978 ASSERT(clone->ds_reserved == 0);
2980 * NOTE: On DEBUG kernels there could be a race between this and
2981 * the check function if spa_asize_inflation is adjusted...
2983 ASSERT(origin_head->ds_quota == 0 ||
2984 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
2985 DMU_MAX_ACCESS * spa_asize_inflation);
2986 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
2989 * Swap per-dataset feature flags.
2991 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
2992 if (!(spa_feature_table[f].fi_flags &
2993 ZFEATURE_FLAG_PER_DATASET)) {
2994 ASSERT(!clone->ds_feature_inuse[f]);
2995 ASSERT(!origin_head->ds_feature_inuse[f]);
2999 boolean_t clone_inuse = clone->ds_feature_inuse[f];
3000 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
3003 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
3004 clone->ds_feature_inuse[f] = B_FALSE;
3006 if (origin_head_inuse) {
3007 dsl_dataset_deactivate_feature(origin_head->ds_object,
3009 origin_head->ds_feature_inuse[f] = B_FALSE;
3012 dsl_dataset_activate_feature(origin_head->ds_object,
3014 origin_head->ds_feature_inuse[f] = B_TRUE;
3016 if (origin_head_inuse) {
3017 dsl_dataset_activate_feature(clone->ds_object, f, tx);
3018 clone->ds_feature_inuse[f] = B_TRUE;
3022 dmu_buf_will_dirty(clone->ds_dbuf, tx);
3023 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
3025 if (clone->ds_objset != NULL) {
3026 dmu_objset_evict(clone->ds_objset);
3027 clone->ds_objset = NULL;
3030 if (origin_head->ds_objset != NULL) {
3031 dmu_objset_evict(origin_head->ds_objset);
3032 origin_head->ds_objset = NULL;
3035 unused_refres_delta =
3036 (int64_t)MIN(origin_head->ds_reserved,
3037 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3038 (int64_t)MIN(origin_head->ds_reserved,
3039 dsl_dataset_phys(clone)->ds_unique_bytes);
3042 * Reset origin's unique bytes, if it exists.
3044 if (clone->ds_prev) {
3045 dsl_dataset_t *origin = clone->ds_prev;
3046 uint64_t comp, uncomp;
3048 dmu_buf_will_dirty(origin->ds_dbuf, tx);
3049 dsl_deadlist_space_range(&clone->ds_deadlist,
3050 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
3051 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
3057 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3058 dsl_dataset_phys(origin_head)->ds_bp =
3059 dsl_dataset_phys(clone)->ds_bp;
3060 dsl_dataset_phys(clone)->ds_bp = tmp;
3063 /* set dd_*_bytes */
3065 int64_t dused, dcomp, duncomp;
3066 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3067 uint64_t odl_used, odl_comp, odl_uncomp;
3069 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3070 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3072 dsl_deadlist_space(&clone->ds_deadlist,
3073 &cdl_used, &cdl_comp, &cdl_uncomp);
3074 dsl_deadlist_space(&origin_head->ds_deadlist,
3075 &odl_used, &odl_comp, &odl_uncomp);
3077 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3079 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3081 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3083 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3085 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3087 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3090 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3091 dused, dcomp, duncomp, tx);
3092 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3093 -dused, -dcomp, -duncomp, tx);
3096 * The difference in the space used by snapshots is the
3097 * difference in snapshot space due to the head's
3098 * deadlist (since that's the only thing that's
3099 * changing that affects the snapused).
3101 dsl_deadlist_space_range(&clone->ds_deadlist,
3102 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3103 &cdl_used, &cdl_comp, &cdl_uncomp);
3104 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3105 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3106 &odl_used, &odl_comp, &odl_uncomp);
3107 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3108 DD_USED_HEAD, DD_USED_SNAP, NULL);
3111 /* swap ds_*_bytes */
3112 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3113 dsl_dataset_phys(clone)->ds_referenced_bytes);
3114 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3115 dsl_dataset_phys(clone)->ds_compressed_bytes);
3116 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3117 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3118 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3119 dsl_dataset_phys(clone)->ds_unique_bytes);
3121 /* apply any parent delta for change in unconsumed refreservation */
3122 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3123 unused_refres_delta, 0, 0, tx);
3128 dsl_deadlist_close(&clone->ds_deadlist);
3129 dsl_deadlist_close(&origin_head->ds_deadlist);
3130 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3131 dsl_dataset_phys(clone)->ds_deadlist_obj);
3132 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3133 dsl_dataset_phys(clone)->ds_deadlist_obj);
3134 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3135 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3137 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3139 spa_history_log_internal_ds(clone, "clone swap", tx,
3140 "parent=%s", origin_head->ds_dir->dd_myname);
3144 * Given a pool name and a dataset object number in that pool,
3145 * return the name of that dataset.
3148 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3154 error = dsl_pool_hold(pname, FTAG, &dp);
3158 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3160 dsl_dataset_name(ds, buf);
3161 dsl_dataset_rele(ds, FTAG);
3163 dsl_pool_rele(dp, FTAG);
3169 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3170 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3174 ASSERT3S(asize, >, 0);
3177 * *ref_rsrv is the portion of asize that will come from any
3178 * unconsumed refreservation space.
3182 mutex_enter(&ds->ds_lock);
3184 * Make a space adjustment for reserved bytes.
3186 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3188 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3190 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3192 asize - MIN(asize, parent_delta(ds, asize + inflight));
3195 if (!check_quota || ds->ds_quota == 0) {
3196 mutex_exit(&ds->ds_lock);
3200 * If they are requesting more space, and our current estimate
3201 * is over quota, they get to try again unless the actual
3202 * on-disk is over quota and there are no pending changes (which
3203 * may free up space for us).
3205 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3208 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3209 error = SET_ERROR(ERESTART);
3211 error = SET_ERROR(EDQUOT);
3213 mutex_exit(&ds->ds_lock);
3218 typedef struct dsl_dataset_set_qr_arg {
3219 const char *ddsqra_name;
3220 zprop_source_t ddsqra_source;
3221 uint64_t ddsqra_value;
3222 } dsl_dataset_set_qr_arg_t;
3227 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3229 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3230 dsl_pool_t *dp = dmu_tx_pool(tx);
3235 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3236 return (SET_ERROR(ENOTSUP));
3238 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3242 if (ds->ds_is_snapshot) {
3243 dsl_dataset_rele(ds, FTAG);
3244 return (SET_ERROR(EINVAL));
3247 error = dsl_prop_predict(ds->ds_dir,
3248 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3249 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3251 dsl_dataset_rele(ds, FTAG);
3256 dsl_dataset_rele(ds, FTAG);
3260 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3261 newval < ds->ds_reserved) {
3262 dsl_dataset_rele(ds, FTAG);
3263 return (SET_ERROR(ENOSPC));
3266 dsl_dataset_rele(ds, FTAG);
3271 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3273 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3274 dsl_pool_t *dp = dmu_tx_pool(tx);
3278 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3280 dsl_prop_set_sync_impl(ds,
3281 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3282 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3283 &ddsqra->ddsqra_value, tx);
3285 VERIFY0(dsl_prop_get_int_ds(ds,
3286 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3288 if (ds->ds_quota != newval) {
3289 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3290 ds->ds_quota = newval;
3292 dsl_dataset_rele(ds, FTAG);
3296 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3299 dsl_dataset_set_qr_arg_t ddsqra;
3301 ddsqra.ddsqra_name = dsname;
3302 ddsqra.ddsqra_source = source;
3303 ddsqra.ddsqra_value = refquota;
3305 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3306 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3310 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3312 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3313 dsl_pool_t *dp = dmu_tx_pool(tx);
3316 uint64_t newval, unique;
3318 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3319 return (SET_ERROR(ENOTSUP));
3321 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3325 if (ds->ds_is_snapshot) {
3326 dsl_dataset_rele(ds, FTAG);
3327 return (SET_ERROR(EINVAL));
3330 error = dsl_prop_predict(ds->ds_dir,
3331 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3332 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3334 dsl_dataset_rele(ds, FTAG);
3339 * If we are doing the preliminary check in open context, the
3340 * space estimates may be inaccurate.
3342 if (!dmu_tx_is_syncing(tx)) {
3343 dsl_dataset_rele(ds, FTAG);
3347 mutex_enter(&ds->ds_lock);
3348 if (!DS_UNIQUE_IS_ACCURATE(ds))
3349 dsl_dataset_recalc_head_uniq(ds);
3350 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3351 mutex_exit(&ds->ds_lock);
3353 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3354 uint64_t delta = MAX(unique, newval) -
3355 MAX(unique, ds->ds_reserved);
3358 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3359 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3360 dsl_dataset_rele(ds, FTAG);
3361 return (SET_ERROR(ENOSPC));
3365 dsl_dataset_rele(ds, FTAG);
3370 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3371 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3377 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3378 source, sizeof (value), 1, &value, tx);
3380 VERIFY0(dsl_prop_get_int_ds(ds,
3381 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3383 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3384 mutex_enter(&ds->ds_dir->dd_lock);
3385 mutex_enter(&ds->ds_lock);
3386 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3387 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3388 delta = MAX(0, (int64_t)(newval - unique)) -
3389 MAX(0, (int64_t)(ds->ds_reserved - unique));
3390 ds->ds_reserved = newval;
3391 mutex_exit(&ds->ds_lock);
3393 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3394 mutex_exit(&ds->ds_dir->dd_lock);
3398 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3400 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3401 dsl_pool_t *dp = dmu_tx_pool(tx);
3404 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3405 dsl_dataset_set_refreservation_sync_impl(ds,
3406 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3407 dsl_dataset_rele(ds, FTAG);
3411 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3412 uint64_t refreservation)
3414 dsl_dataset_set_qr_arg_t ddsqra;
3416 ddsqra.ddsqra_name = dsname;
3417 ddsqra.ddsqra_source = source;
3418 ddsqra.ddsqra_value = refreservation;
3420 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3421 dsl_dataset_set_refreservation_sync, &ddsqra,
3422 0, ZFS_SPACE_CHECK_NONE));
3426 * Return (in *usedp) the amount of space written in new that is not
3427 * present in oldsnap. New may be a snapshot or the head. Old must be
3428 * a snapshot before new, in new's filesystem (or its origin). If not then
3429 * fail and return EINVAL.
3431 * The written space is calculated by considering two components: First, we
3432 * ignore any freed space, and calculate the written as new's used space
3433 * minus old's used space. Next, we add in the amount of space that was freed
3434 * between the two snapshots, thus reducing new's used space relative to old's.
3435 * Specifically, this is the space that was born before old->ds_creation_txg,
3436 * and freed before new (ie. on new's deadlist or a previous deadlist).
3438 * space freed [---------------------]
3439 * snapshots ---O-------O--------O-------O------
3443 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3444 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3448 dsl_pool_t *dp = new->ds_dir->dd_pool;
3450 ASSERT(dsl_pool_config_held(dp));
3453 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3454 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3457 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3458 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3461 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3462 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3464 snapobj = new->ds_object;
3465 while (snapobj != oldsnap->ds_object) {
3466 dsl_dataset_t *snap;
3467 uint64_t used, comp, uncomp;
3469 if (snapobj == new->ds_object) {
3472 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3477 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3478 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3480 * The blocks in the deadlist can not be born after
3481 * ds_prev_snap_txg, so get the whole deadlist space,
3482 * which is more efficient (especially for old-format
3483 * deadlists). Unfortunately the deadlist code
3484 * doesn't have enough information to make this
3485 * optimization itself.
3487 dsl_deadlist_space(&snap->ds_deadlist,
3488 &used, &comp, &uncomp);
3490 dsl_deadlist_space_range(&snap->ds_deadlist,
3491 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3492 &used, &comp, &uncomp);
3499 * If we get to the beginning of the chain of snapshots
3500 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3501 * was not a snapshot of/before new.
3503 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3505 dsl_dataset_rele(snap, FTAG);
3507 err = SET_ERROR(EINVAL);
3516 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3517 * lastsnap, and all snapshots in between are deleted.
3519 * blocks that would be freed [---------------------------]
3520 * snapshots ---O-------O--------O-------O--------O
3521 * firstsnap lastsnap
3523 * This is the set of blocks that were born after the snap before firstsnap,
3524 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3525 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3526 * We calculate this by iterating over the relevant deadlists (from the snap
3527 * after lastsnap, backward to the snap after firstsnap), summing up the
3528 * space on the deadlist that was born after the snap before firstsnap.
3531 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3532 dsl_dataset_t *lastsnap,
3533 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3537 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3539 ASSERT(firstsnap->ds_is_snapshot);
3540 ASSERT(lastsnap->ds_is_snapshot);
3543 * Check that the snapshots are in the same dsl_dir, and firstsnap
3544 * is before lastsnap.
3546 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3547 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3548 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3549 return (SET_ERROR(EINVAL));
3551 *usedp = *compp = *uncompp = 0;
3553 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3554 while (snapobj != firstsnap->ds_object) {
3556 uint64_t used, comp, uncomp;
3558 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3562 dsl_deadlist_space_range(&ds->ds_deadlist,
3563 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3564 &used, &comp, &uncomp);
3569 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3570 ASSERT3U(snapobj, !=, 0);
3571 dsl_dataset_rele(ds, FTAG);
3577 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3578 * For example, they could both be snapshots of the same filesystem, and
3579 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3580 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3581 * filesystem. Or 'earlier' could be the origin's origin.
3583 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
3586 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
3587 uint64_t earlier_txg)
3589 dsl_pool_t *dp = later->ds_dir->dd_pool;
3593 ASSERT(dsl_pool_config_held(dp));
3594 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
3596 if (earlier_txg == 0)
3597 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
3599 if (later->ds_is_snapshot &&
3600 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
3603 if (later->ds_dir == earlier->ds_dir)
3605 if (!dsl_dir_is_clone(later->ds_dir))
3608 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
3610 dsl_dataset_t *origin;
3611 error = dsl_dataset_hold_obj(dp,
3612 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
3615 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
3616 dsl_dataset_rele(origin, FTAG);
3621 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
3623 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
3624 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
3628 dsl_dataset_is_zapified(dsl_dataset_t *ds)
3630 dmu_object_info_t doi;
3632 dmu_object_info_from_db(ds->ds_dbuf, &doi);
3633 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
3637 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
3639 return (dsl_dataset_is_zapified(ds) &&
3640 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
3641 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);