4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org>
25 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
26 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
27 * Copyright (c) 2014 RackTop Systems.
28 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
29 * Copyright (c) 2014 Integros [integros.com]
30 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved.
31 * Copyright 2017 Nexenta Systems, Inc.
34 #include <sys/dmu_objset.h>
35 #include <sys/dsl_dataset.h>
36 #include <sys/dsl_dir.h>
37 #include <sys/dsl_prop.h>
38 #include <sys/dsl_synctask.h>
39 #include <sys/dmu_traverse.h>
40 #include <sys/dmu_impl.h>
41 #include <sys/dmu_send.h>
42 #include <sys/dmu_tx.h>
46 #include <sys/zfeature.h>
47 #include <sys/unique.h>
48 #include <sys/zfs_context.h>
49 #include <sys/zfs_ioctl.h>
51 #include <sys/zfs_znode.h>
52 #include <sys/zfs_onexit.h>
54 #include <sys/dsl_scan.h>
55 #include <sys/dsl_deadlist.h>
56 #include <sys/dsl_destroy.h>
57 #include <sys/dsl_userhold.h>
58 #include <sys/dsl_bookmark.h>
59 #include <sys/dmu_send.h>
60 #include <sys/zio_checksum.h>
61 #include <sys/zio_compress.h>
62 #include <zfs_fletcher.h>
64 SYSCTL_DECL(_vfs_zfs);
67 * The SPA supports block sizes up to 16MB. However, very large blocks
68 * can have an impact on i/o latency (e.g. tying up a spinning disk for
69 * ~300ms), and also potentially on the memory allocator. Therefore,
70 * we do not allow the recordsize to be set larger than zfs_max_recordsize
71 * (default 1MB). Larger blocks can be created by changing this tunable,
72 * and pools with larger blocks can always be imported and used, regardless
75 int zfs_max_recordsize = 1 * 1024 * 1024;
76 SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN,
77 &zfs_max_recordsize, 0,
78 "Maximum block size. Expect dragons when tuning this.");
80 #define SWITCH64(x, y) \
82 uint64_t __tmp = (x); \
87 #define DS_REF_MAX (1ULL << 62)
89 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds);
91 extern int spa_asize_inflation;
93 static zil_header_t zero_zil;
96 * Figure out how much of this delta should be propogated to the dsl_dir
97 * layer. If there's a refreservation, that space has already been
98 * partially accounted for in our ancestors.
101 parent_delta(dsl_dataset_t *ds, int64_t delta)
103 dsl_dataset_phys_t *ds_phys;
104 uint64_t old_bytes, new_bytes;
106 if (ds->ds_reserved == 0)
109 ds_phys = dsl_dataset_phys(ds);
110 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved);
111 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved);
113 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta));
114 return (new_bytes - old_bytes);
118 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx)
120 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
121 int compressed = BP_GET_PSIZE(bp);
122 int uncompressed = BP_GET_UCSIZE(bp);
125 dprintf_bp(bp, "ds=%p", ds);
127 ASSERT(dmu_tx_is_syncing(tx));
128 /* It could have been compressed away to nothing */
131 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
132 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp)));
134 dsl_pool_mos_diduse_space(tx->tx_pool,
135 used, compressed, uncompressed);
139 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
140 dmu_buf_will_dirty(ds->ds_dbuf, tx);
141 mutex_enter(&ds->ds_lock);
142 delta = parent_delta(ds, used);
143 dsl_dataset_phys(ds)->ds_referenced_bytes += used;
144 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed;
145 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed;
146 dsl_dataset_phys(ds)->ds_unique_bytes += used;
148 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) {
149 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] =
153 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp));
154 if (f != SPA_FEATURE_NONE)
155 ds->ds_feature_activation_needed[f] = B_TRUE;
157 mutex_exit(&ds->ds_lock);
158 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta,
159 compressed, uncompressed, tx);
160 dsl_dir_transfer_space(ds->ds_dir, used - delta,
161 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
165 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx,
168 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp);
169 int compressed = BP_GET_PSIZE(bp);
170 int uncompressed = BP_GET_UCSIZE(bp);
175 ASSERT(dmu_tx_is_syncing(tx));
176 ASSERT(bp->blk_birth <= tx->tx_txg);
179 dsl_free(tx->tx_pool, tx->tx_txg, bp);
180 dsl_pool_mos_diduse_space(tx->tx_pool,
181 -used, -compressed, -uncompressed);
184 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
186 ASSERT(!ds->ds_is_snapshot);
187 dmu_buf_will_dirty(ds->ds_dbuf, tx);
189 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
192 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object);
193 dsl_free(tx->tx_pool, tx->tx_txg, bp);
195 mutex_enter(&ds->ds_lock);
196 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used ||
197 !DS_UNIQUE_IS_ACCURATE(ds));
198 delta = parent_delta(ds, -used);
199 dsl_dataset_phys(ds)->ds_unique_bytes -= used;
200 mutex_exit(&ds->ds_lock);
201 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
202 delta, -compressed, -uncompressed, tx);
203 dsl_dir_transfer_space(ds->ds_dir, -used - delta,
204 DD_USED_REFRSRV, DD_USED_HEAD, NULL);
206 dprintf_bp(bp, "putting on dead list: %s", "");
209 * We are here as part of zio's write done callback,
210 * which means we're a zio interrupt thread. We can't
211 * call dsl_deadlist_insert() now because it may block
212 * waiting for I/O. Instead, put bp on the deferred
213 * queue and let dsl_pool_sync() finish the job.
215 bplist_append(&ds->ds_pending_deadlist, bp);
217 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx);
219 ASSERT3U(ds->ds_prev->ds_object, ==,
220 dsl_dataset_phys(ds)->ds_prev_snap_obj);
221 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0);
222 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
223 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
224 ds->ds_object && bp->blk_birth >
225 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) {
226 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
227 mutex_enter(&ds->ds_prev->ds_lock);
228 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used;
229 mutex_exit(&ds->ds_prev->ds_lock);
231 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) {
232 dsl_dir_transfer_space(ds->ds_dir, used,
233 DD_USED_HEAD, DD_USED_SNAP, tx);
236 mutex_enter(&ds->ds_lock);
237 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used);
238 dsl_dataset_phys(ds)->ds_referenced_bytes -= used;
239 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed);
240 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed;
241 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed);
242 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed;
243 mutex_exit(&ds->ds_lock);
249 * We have to release the fsid syncronously or we risk that a subsequent
250 * mount of the same dataset will fail to unique_insert the fsid. This
251 * failure would manifest itself as the fsid of this dataset changing
252 * between mounts which makes NFS clients quite unhappy.
255 dsl_dataset_evict_sync(void *dbu)
257 dsl_dataset_t *ds = dbu;
259 ASSERT(ds->ds_owner == NULL);
261 unique_remove(ds->ds_fsid_guid);
265 dsl_dataset_evict_async(void *dbu)
267 dsl_dataset_t *ds = dbu;
269 ASSERT(ds->ds_owner == NULL);
273 if (ds->ds_objset != NULL)
274 dmu_objset_evict(ds->ds_objset);
277 dsl_dataset_rele(ds->ds_prev, ds);
281 bplist_destroy(&ds->ds_pending_deadlist);
282 if (ds->ds_deadlist.dl_os != NULL)
283 dsl_deadlist_close(&ds->ds_deadlist);
285 dsl_dir_async_rele(ds->ds_dir, ds);
287 ASSERT(!list_link_active(&ds->ds_synced_link));
289 list_destroy(&ds->ds_prop_cbs);
290 if (mutex_owned(&ds->ds_lock))
291 mutex_exit(&ds->ds_lock);
292 mutex_destroy(&ds->ds_lock);
293 if (mutex_owned(&ds->ds_opening_lock))
294 mutex_exit(&ds->ds_opening_lock);
295 mutex_destroy(&ds->ds_opening_lock);
296 mutex_destroy(&ds->ds_sendstream_lock);
297 refcount_destroy(&ds->ds_longholds);
298 rrw_destroy(&ds->ds_bp_rwlock);
300 kmem_free(ds, sizeof (dsl_dataset_t));
304 dsl_dataset_get_snapname(dsl_dataset_t *ds)
306 dsl_dataset_phys_t *headphys;
309 dsl_pool_t *dp = ds->ds_dir->dd_pool;
310 objset_t *mos = dp->dp_meta_objset;
312 if (ds->ds_snapname[0])
314 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0)
317 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj,
321 headphys = headdbuf->db_data;
322 err = zap_value_search(dp->dp_meta_objset,
323 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname);
324 dmu_buf_rele(headdbuf, FTAG);
329 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value)
331 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
332 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
336 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
339 err = zap_lookup_norm(mos, snapobj, name, 8, 1,
340 value, mt, NULL, 0, NULL);
341 if (err == ENOTSUP && (mt & MT_NORMALIZE))
342 err = zap_lookup(mos, snapobj, name, 8, 1, value);
347 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
350 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
351 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
355 dsl_dir_snap_cmtime_update(ds->ds_dir);
357 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
360 err = zap_remove_norm(mos, snapobj, name, mt, tx);
361 if (err == ENOTSUP && (mt & MT_NORMALIZE))
362 err = zap_remove(mos, snapobj, name, tx);
364 if (err == 0 && adj_cnt)
365 dsl_fs_ss_count_adjust(ds->ds_dir, -1,
366 DD_FIELD_SNAPSHOT_COUNT, tx);
372 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag)
374 dmu_buf_t *dbuf = ds->ds_dbuf;
375 boolean_t result = B_FALSE;
377 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset,
378 ds->ds_object, DMU_BONUS_BLKID, tag)) {
380 if (ds == dmu_buf_get_user(dbuf))
383 dmu_buf_rele(dbuf, tag);
390 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
393 objset_t *mos = dp->dp_meta_objset;
397 dmu_object_info_t doi;
399 ASSERT(dsl_pool_config_held(dp));
401 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
405 /* Make sure dsobj has the correct object type. */
406 dmu_object_info_from_db(dbuf, &doi);
407 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) {
408 dmu_buf_rele(dbuf, tag);
409 return (SET_ERROR(EINVAL));
412 ds = dmu_buf_get_user(dbuf);
414 dsl_dataset_t *winner = NULL;
416 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
418 ds->ds_object = dsobj;
419 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0;
421 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
422 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL);
423 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL);
424 rrw_init(&ds->ds_bp_rwlock, B_FALSE);
425 refcount_create(&ds->ds_longholds);
427 bplist_create(&ds->ds_pending_deadlist);
428 dsl_deadlist_open(&ds->ds_deadlist,
429 mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
431 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t),
432 offsetof(dmu_sendarg_t, dsa_link));
434 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t),
435 offsetof(dsl_prop_cb_record_t, cbr_ds_node));
437 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
438 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
439 if (!(spa_feature_table[f].fi_flags &
440 ZFEATURE_FLAG_PER_DATASET))
442 err = zap_contains(mos, dsobj,
443 spa_feature_table[f].fi_guid);
445 ds->ds_feature_inuse[f] = B_TRUE;
447 ASSERT3U(err, ==, ENOENT);
453 err = dsl_dir_hold_obj(dp,
454 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir);
456 mutex_destroy(&ds->ds_lock);
457 mutex_destroy(&ds->ds_opening_lock);
458 mutex_destroy(&ds->ds_sendstream_lock);
459 refcount_destroy(&ds->ds_longholds);
460 bplist_destroy(&ds->ds_pending_deadlist);
461 dsl_deadlist_close(&ds->ds_deadlist);
462 kmem_free(ds, sizeof (dsl_dataset_t));
463 dmu_buf_rele(dbuf, tag);
467 if (!ds->ds_is_snapshot) {
468 ds->ds_snapname[0] = '\0';
469 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
470 err = dsl_dataset_hold_obj(dp,
471 dsl_dataset_phys(ds)->ds_prev_snap_obj,
474 if (doi.doi_type == DMU_OTN_ZAP_METADATA) {
475 int zaperr = zap_lookup(mos, ds->ds_object,
476 DS_FIELD_BOOKMARK_NAMES,
477 sizeof (ds->ds_bookmarks), 1,
479 if (zaperr != ENOENT)
483 if (zfs_flags & ZFS_DEBUG_SNAPNAMES)
484 err = dsl_dataset_get_snapname(ds);
486 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) {
488 ds->ds_dir->dd_pool->dp_meta_objset,
489 dsl_dataset_phys(ds)->ds_userrefs_obj,
494 if (err == 0 && !ds->ds_is_snapshot) {
495 err = dsl_prop_get_int_ds(ds,
496 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
499 err = dsl_prop_get_int_ds(ds,
500 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
504 ds->ds_reserved = ds->ds_quota = 0;
507 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
508 dsl_dataset_evict_async, &ds->ds_dbuf);
510 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
512 if (err != 0 || winner != NULL) {
513 bplist_destroy(&ds->ds_pending_deadlist);
514 dsl_deadlist_close(&ds->ds_deadlist);
516 dsl_dataset_rele(ds->ds_prev, ds);
517 dsl_dir_rele(ds->ds_dir, ds);
518 mutex_destroy(&ds->ds_lock);
519 mutex_destroy(&ds->ds_opening_lock);
520 mutex_destroy(&ds->ds_sendstream_lock);
521 refcount_destroy(&ds->ds_longholds);
522 kmem_free(ds, sizeof (dsl_dataset_t));
524 dmu_buf_rele(dbuf, tag);
530 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid);
531 if (ds->ds_fsid_guid !=
532 dsl_dataset_phys(ds)->ds_fsid_guid) {
533 zfs_dbgmsg("ds_fsid_guid changed from "
534 "%llx to %llx for pool %s dataset id %llu",
536 dsl_dataset_phys(ds)->ds_fsid_guid,
537 (long long)ds->ds_fsid_guid,
538 spa_name(dp->dp_spa),
543 ASSERT3P(ds->ds_dbuf, ==, dbuf);
544 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data);
545 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 ||
546 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN ||
547 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap);
553 dsl_dataset_hold(dsl_pool_t *dp, const char *name,
554 void *tag, dsl_dataset_t **dsp)
557 const char *snapname;
562 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname);
566 ASSERT(dsl_pool_config_held(dp));
567 obj = dsl_dir_phys(dd)->dd_head_dataset_obj;
569 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
571 err = SET_ERROR(ENOENT);
573 /* we may be looking for a snapshot */
574 if (err == 0 && snapname != NULL) {
575 dsl_dataset_t *snap_ds;
577 if (*snapname++ != '@') {
578 dsl_dataset_rele(ds, tag);
579 dsl_dir_rele(dd, FTAG);
580 return (SET_ERROR(ENOENT));
583 dprintf("looking for snapshot '%s'\n", snapname);
584 err = dsl_dataset_snap_lookup(ds, snapname, &obj);
586 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds);
587 dsl_dataset_rele(ds, tag);
590 mutex_enter(&snap_ds->ds_lock);
591 if (snap_ds->ds_snapname[0] == 0)
592 (void) strlcpy(snap_ds->ds_snapname, snapname,
593 sizeof (snap_ds->ds_snapname));
594 mutex_exit(&snap_ds->ds_lock);
600 dsl_dir_rele(dd, FTAG);
605 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj,
606 void *tag, dsl_dataset_t **dsp)
608 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp);
611 if (!dsl_dataset_tryown(*dsp, tag)) {
612 dsl_dataset_rele(*dsp, tag);
614 return (SET_ERROR(EBUSY));
620 dsl_dataset_own(dsl_pool_t *dp, const char *name,
621 void *tag, dsl_dataset_t **dsp)
623 int err = dsl_dataset_hold(dp, name, tag, dsp);
626 if (!dsl_dataset_tryown(*dsp, tag)) {
627 dsl_dataset_rele(*dsp, tag);
628 return (SET_ERROR(EBUSY));
634 * See the comment above dsl_pool_hold() for details. In summary, a long
635 * hold is used to prevent destruction of a dataset while the pool hold
636 * is dropped, allowing other concurrent operations (e.g. spa_sync()).
638 * The dataset and pool must be held when this function is called. After it
639 * is called, the pool hold may be released while the dataset is still held
643 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
645 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
646 (void) refcount_add(&ds->ds_longholds, tag);
650 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
652 (void) refcount_remove(&ds->ds_longholds, tag);
655 /* Return B_TRUE if there are any long holds on this dataset. */
657 dsl_dataset_long_held(dsl_dataset_t *ds)
659 return (!refcount_is_zero(&ds->ds_longholds));
663 dsl_dataset_name(dsl_dataset_t *ds, char *name)
666 (void) strcpy(name, "mos");
668 dsl_dir_name(ds->ds_dir, name);
669 VERIFY0(dsl_dataset_get_snapname(ds));
670 if (ds->ds_snapname[0]) {
671 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN),
672 <, ZFS_MAX_DATASET_NAME_LEN);
674 * We use a "recursive" mutex so that we
675 * can call dprintf_ds() with ds_lock held.
677 if (!MUTEX_HELD(&ds->ds_lock)) {
678 mutex_enter(&ds->ds_lock);
679 VERIFY3U(strlcat(name, ds->ds_snapname,
680 ZFS_MAX_DATASET_NAME_LEN), <,
681 ZFS_MAX_DATASET_NAME_LEN);
682 mutex_exit(&ds->ds_lock);
684 VERIFY3U(strlcat(name, ds->ds_snapname,
685 ZFS_MAX_DATASET_NAME_LEN), <,
686 ZFS_MAX_DATASET_NAME_LEN);
693 dsl_dataset_namelen(dsl_dataset_t *ds)
695 VERIFY0(dsl_dataset_get_snapname(ds));
696 mutex_enter(&ds->ds_lock);
697 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
698 mutex_exit(&ds->ds_lock);
703 dsl_dataset_rele(dsl_dataset_t *ds, void *tag)
705 dmu_buf_rele(ds->ds_dbuf, tag);
709 dsl_dataset_disown(dsl_dataset_t *ds, void *tag)
711 ASSERT3P(ds->ds_owner, ==, tag);
712 ASSERT(ds->ds_dbuf != NULL);
714 mutex_enter(&ds->ds_lock);
716 mutex_exit(&ds->ds_lock);
717 dsl_dataset_long_rele(ds, tag);
718 dsl_dataset_rele(ds, tag);
722 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag)
724 boolean_t gotit = FALSE;
726 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
727 mutex_enter(&ds->ds_lock);
728 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) {
730 dsl_dataset_long_hold(ds, tag);
733 mutex_exit(&ds->ds_lock);
738 dsl_dataset_has_owner(dsl_dataset_t *ds)
741 mutex_enter(&ds->ds_lock);
742 rv = (ds->ds_owner != NULL);
743 mutex_exit(&ds->ds_lock);
748 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
750 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
751 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
754 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
756 spa_feature_incr(spa, f, tx);
757 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx);
759 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid,
760 sizeof (zero), 1, &zero, tx));
764 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx)
766 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
767 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset;
769 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET);
771 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx));
772 spa_feature_decr(spa, f, tx);
776 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
777 uint64_t flags, dmu_tx_t *tx)
779 dsl_pool_t *dp = dd->dd_pool;
781 dsl_dataset_phys_t *dsphys;
783 objset_t *mos = dp->dp_meta_objset;
786 origin = dp->dp_origin_snap;
788 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp);
789 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0);
790 ASSERT(dmu_tx_is_syncing(tx));
791 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
793 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
794 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
795 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
796 dmu_buf_will_dirty(dbuf, tx);
797 dsphys = dbuf->db_data;
798 bzero(dsphys, sizeof (dsl_dataset_phys_t));
799 dsphys->ds_dir_obj = dd->dd_object;
800 dsphys->ds_flags = flags;
801 dsphys->ds_fsid_guid = unique_create();
803 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
804 sizeof (dsphys->ds_guid));
805 } while (dsphys->ds_guid == 0);
806 dsphys->ds_snapnames_zapobj =
807 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP,
809 dsphys->ds_creation_time = gethrestime_sec();
810 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg;
812 if (origin == NULL) {
813 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx);
815 dsl_dataset_t *ohds; /* head of the origin snapshot */
817 dsphys->ds_prev_snap_obj = origin->ds_object;
818 dsphys->ds_prev_snap_txg =
819 dsl_dataset_phys(origin)->ds_creation_txg;
820 dsphys->ds_referenced_bytes =
821 dsl_dataset_phys(origin)->ds_referenced_bytes;
822 dsphys->ds_compressed_bytes =
823 dsl_dataset_phys(origin)->ds_compressed_bytes;
824 dsphys->ds_uncompressed_bytes =
825 dsl_dataset_phys(origin)->ds_uncompressed_bytes;
826 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG);
827 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp;
828 rrw_exit(&origin->ds_bp_rwlock, FTAG);
831 * Inherit flags that describe the dataset's contents
832 * (INCONSISTENT) or properties (Case Insensitive).
834 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags &
835 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET);
837 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
838 if (origin->ds_feature_inuse[f])
839 dsl_dataset_activate_feature(dsobj, f, tx);
842 dmu_buf_will_dirty(origin->ds_dbuf, tx);
843 dsl_dataset_phys(origin)->ds_num_children++;
845 VERIFY0(dsl_dataset_hold_obj(dp,
846 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj,
848 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist,
849 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx);
850 dsl_dataset_rele(ohds, FTAG);
852 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) {
853 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) {
854 dsl_dataset_phys(origin)->ds_next_clones_obj =
856 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
858 VERIFY0(zap_add_int(mos,
859 dsl_dataset_phys(origin)->ds_next_clones_obj,
863 dmu_buf_will_dirty(dd->dd_dbuf, tx);
864 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object;
865 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
866 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) {
867 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
868 dsl_dir_phys(origin->ds_dir)->dd_clones =
870 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
872 VERIFY0(zap_add_int(mos,
873 dsl_dir_phys(origin->ds_dir)->dd_clones,
878 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
879 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
881 dmu_buf_rele(dbuf, FTAG);
883 dmu_buf_will_dirty(dd->dd_dbuf, tx);
884 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj;
890 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
894 VERIFY0(dmu_objset_from_ds(ds, &os));
895 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) {
896 dsl_pool_t *dp = ds->ds_dir->dd_pool;
899 bzero(&os->os_zil_header, sizeof (os->os_zil_header));
901 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
902 dsl_dataset_sync(ds, zio, tx);
903 VERIFY0(zio_wait(zio));
905 /* dsl_dataset_sync_done will drop this reference. */
906 dmu_buf_add_ref(ds->ds_dbuf, ds);
907 dsl_dataset_sync_done(ds, tx);
912 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
913 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx)
915 dsl_pool_t *dp = pdd->dd_pool;
916 uint64_t dsobj, ddobj;
919 ASSERT(dmu_tx_is_syncing(tx));
920 ASSERT(lastname[0] != '@');
922 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
923 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));
925 dsobj = dsl_dataset_create_sync_dd(dd, origin,
926 flags & ~DS_CREATE_FLAG_NODIRTY, tx);
928 dsl_deleg_set_create_perms(dd, tx, cr);
931 * Since we're creating a new node we know it's a leaf, so we can
932 * initialize the counts if the limit feature is active.
934 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
936 objset_t *os = dd->dd_pool->dp_meta_objset;
938 dsl_dir_zapify(dd, tx);
939 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
940 sizeof (cnt), 1, &cnt, tx));
941 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
942 sizeof (cnt), 1, &cnt, tx));
945 dsl_dir_rele(dd, FTAG);
948 * If we are creating a clone, make sure we zero out any stale
949 * data from the origin snapshots zil header.
951 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) {
954 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
955 dsl_dataset_zero_zil(ds, tx);
956 dsl_dataset_rele(ds, FTAG);
963 /* FreeBSD ioctl compat begin */
966 const char *snapname;
970 dsl_check_snap_cb(const char *name, void *arg)
972 struct destroyarg *da = arg;
976 dsname = kmem_asprintf("%s@%s", name, da->snapname);
977 fnvlist_add_boolean(da->nvl, dsname);
978 kmem_free(dsname, strlen(dsname) + 1);
984 dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname,
987 struct destroyarg *da;
990 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP);
992 da->snapname = snapname;
993 err = dmu_objset_find(fsname, dsl_check_snap_cb, da,
995 kmem_free(da, sizeof (struct destroyarg));
999 /* FreeBSD ioctl compat end */
1000 #endif /* __FreeBSD__ */
1003 * The unique space in the head dataset can be calculated by subtracting
1004 * the space used in the most recent snapshot, that is still being used
1005 * in this file system, from the space currently in use. To figure out
1006 * the space in the most recent snapshot still in use, we need to take
1007 * the total space used in the snapshot and subtract out the space that
1008 * has been freed up since the snapshot was taken.
1011 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds)
1014 uint64_t dlused, dlcomp, dluncomp;
1016 ASSERT(!ds->ds_is_snapshot);
1018 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0)
1019 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes;
1023 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp);
1025 ASSERT3U(dlused, <=, mrs_used);
1026 dsl_dataset_phys(ds)->ds_unique_bytes =
1027 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused);
1029 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >=
1030 SPA_VERSION_UNIQUE_ACCURATE)
1031 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1035 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
1038 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1042 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2);
1043 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1046 * The err should not be ENOENT, but a bug in a previous version
1047 * of the code could cause upgrade_clones_cb() to not set
1048 * ds_next_snap_obj when it should, leading to a missing entry.
1049 * If we knew that the pool was created after
1050 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't
1051 * ENOENT. However, at least we can check that we don't have
1052 * too many entries in the next_clones_obj even after failing to
1057 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1059 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2);
1064 dsl_dataset_get_blkptr(dsl_dataset_t *ds)
1066 return (&dsl_dataset_phys(ds)->ds_bp);
1070 dsl_dataset_get_spa(dsl_dataset_t *ds)
1072 return (ds->ds_dir->dd_pool->dp_spa);
1076 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
1080 if (ds == NULL) /* this is the meta-objset */
1083 ASSERT(ds->ds_objset != NULL);
1085 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0)
1086 panic("dirtying snapshot!");
1088 /* Must not dirty a dataset in the same txg where it got snapshotted. */
1089 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg);
1091 dp = ds->ds_dir->dd_pool;
1092 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) {
1093 /* up the hold count until we can be written out */
1094 dmu_buf_add_ref(ds->ds_dbuf, ds);
1099 dsl_dataset_is_dirty(dsl_dataset_t *ds)
1101 for (int t = 0; t < TXG_SIZE; t++) {
1102 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1110 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx)
1114 if (!dmu_tx_is_syncing(tx))
1118 * If there's an fs-only reservation, any blocks that might become
1119 * owned by the snapshot dataset must be accommodated by space
1120 * outside of the reservation.
1122 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds));
1123 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved);
1124 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE))
1125 return (SET_ERROR(ENOSPC));
1128 * Propagate any reserved space for this snapshot to other
1129 * snapshot checks in this sync group.
1132 dsl_dir_willuse_space(ds->ds_dir, asize, tx);
1138 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
1139 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr)
1144 ds->ds_trysnap_txg = tx->tx_txg;
1146 if (!dmu_tx_is_syncing(tx))
1150 * We don't allow multiple snapshots of the same txg. If there
1151 * is already one, try again.
1153 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg)
1154 return (SET_ERROR(EAGAIN));
1157 * Check for conflicting snapshot name.
1159 error = dsl_dataset_snap_lookup(ds, snapname, &value);
1161 return (SET_ERROR(EEXIST));
1162 if (error != ENOENT)
1166 * We don't allow taking snapshots of inconsistent datasets, such as
1167 * those into which we are currently receiving. However, if we are
1168 * creating this snapshot as part of a receive, this check will be
1169 * executed atomically with respect to the completion of the receive
1170 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this
1171 * case we ignore this, knowing it will be fixed up for us shortly in
1172 * dmu_recv_end_sync().
1174 if (!recv && DS_IS_INCONSISTENT(ds))
1175 return (SET_ERROR(EBUSY));
1178 * Skip the check for temporary snapshots or if we have already checked
1179 * the counts in dsl_dataset_snapshot_check. This means we really only
1180 * check the count here when we're receiving a stream.
1182 if (cnt != 0 && cr != NULL) {
1183 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1184 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr);
1189 error = dsl_dataset_snapshot_reserve_space(ds, tx);
1197 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx)
1199 dsl_dataset_snapshot_arg_t *ddsa = arg;
1200 dsl_pool_t *dp = dmu_tx_pool(tx);
1205 * Pre-compute how many total new snapshots will be created for each
1206 * level in the tree and below. This is needed for validating the
1207 * snapshot limit when either taking a recursive snapshot or when
1208 * taking multiple snapshots.
1210 * The problem is that the counts are not actually adjusted when
1211 * we are checking, only when we finally sync. For a single snapshot,
1212 * this is easy, the count will increase by 1 at each node up the tree,
1213 * but its more complicated for the recursive/multiple snapshot case.
1215 * The dsl_fs_ss_limit_check function does recursively check the count
1216 * at each level up the tree but since it is validating each snapshot
1217 * independently we need to be sure that we are validating the complete
1218 * count for the entire set of snapshots. We do this by rolling up the
1219 * counts for each component of the name into an nvlist and then
1220 * checking each of those cases with the aggregated count.
1222 * This approach properly handles not only the recursive snapshot
1223 * case (where we get all of those on the ddsa_snaps list) but also
1224 * the sibling case (e.g. snapshot a/b and a/c so that we will also
1225 * validate the limit on 'a' using a count of 2).
1227 * We validate the snapshot names in the third loop and only report
1230 if (dmu_tx_is_syncing(tx)) {
1231 nvlist_t *cnt_track = NULL;
1232 cnt_track = fnvlist_alloc();
1234 /* Rollup aggregated counts into the cnt_track list */
1235 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1237 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1240 char nm[MAXPATHLEN];
1242 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm));
1243 pdelim = strchr(nm, '@');
1249 if (nvlist_lookup_uint64(cnt_track, nm,
1251 /* update existing entry */
1252 fnvlist_add_uint64(cnt_track, nm,
1256 fnvlist_add_uint64(cnt_track, nm, 1);
1259 pdelim = strrchr(nm, '/');
1262 } while (pdelim != NULL);
1265 /* Check aggregated counts at each level */
1266 for (pair = nvlist_next_nvpair(cnt_track, NULL);
1267 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) {
1273 name = nvpair_name(pair);
1274 cnt = fnvpair_value_uint64(pair);
1277 error = dsl_dataset_hold(dp, name, FTAG, &ds);
1279 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt,
1280 ZFS_PROP_SNAPSHOT_LIMIT, NULL,
1282 dsl_dataset_rele(ds, FTAG);
1286 if (ddsa->ddsa_errors != NULL)
1287 fnvlist_add_int32(ddsa->ddsa_errors,
1290 /* only report one error for this check */
1294 nvlist_free(cnt_track);
1297 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1298 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1302 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1304 name = nvpair_name(pair);
1305 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN)
1306 error = SET_ERROR(ENAMETOOLONG);
1308 atp = strchr(name, '@');
1310 error = SET_ERROR(EINVAL);
1312 (void) strlcpy(dsname, name, atp - name + 1);
1315 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
1317 /* passing 0/NULL skips dsl_fs_ss_limit_check */
1318 error = dsl_dataset_snapshot_check_impl(ds,
1319 atp + 1, tx, B_FALSE, 0, NULL);
1320 dsl_dataset_rele(ds, FTAG);
1324 if (ddsa->ddsa_errors != NULL) {
1325 fnvlist_add_int32(ddsa->ddsa_errors,
1336 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
1339 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1341 dsl_dataset_phys_t *dsphys;
1342 uint64_t dsobj, crtxg;
1343 objset_t *mos = dp->dp_meta_objset;
1346 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
1349 * If we are on an old pool, the zil must not be active, in which
1350 * case it will be zeroed. Usually zil_suspend() accomplishes this.
1352 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP ||
1353 dmu_objset_from_ds(ds, &os) != 0 ||
1354 bcmp(&os->os_phys->os_zil_header, &zero_zil,
1355 sizeof (zero_zil)) == 0);
1357 /* Should not snapshot a dirty dataset. */
1358 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets,
1361 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx);
1364 * The origin's ds_creation_txg has to be < TXG_INITIAL
1366 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0)
1371 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
1372 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
1373 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
1374 dmu_buf_will_dirty(dbuf, tx);
1375 dsphys = dbuf->db_data;
1376 bzero(dsphys, sizeof (dsl_dataset_phys_t));
1377 dsphys->ds_dir_obj = ds->ds_dir->dd_object;
1378 dsphys->ds_fsid_guid = unique_create();
1380 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
1381 sizeof (dsphys->ds_guid));
1382 } while (dsphys->ds_guid == 0);
1383 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
1384 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
1385 dsphys->ds_next_snap_obj = ds->ds_object;
1386 dsphys->ds_num_children = 1;
1387 dsphys->ds_creation_time = gethrestime_sec();
1388 dsphys->ds_creation_txg = crtxg;
1389 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj;
1390 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes;
1391 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes;
1392 dsphys->ds_uncompressed_bytes =
1393 dsl_dataset_phys(ds)->ds_uncompressed_bytes;
1394 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags;
1395 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
1396 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp;
1397 rrw_exit(&ds->ds_bp_rwlock, FTAG);
1398 dmu_buf_rele(dbuf, FTAG);
1400 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1401 if (ds->ds_feature_inuse[f])
1402 dsl_dataset_activate_feature(dsobj, f, tx);
1405 ASSERT3U(ds->ds_prev != 0, ==,
1406 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1408 uint64_t next_clones_obj =
1409 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj;
1410 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1412 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1);
1413 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj ==
1415 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1416 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==,
1417 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg);
1418 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj;
1419 } else if (next_clones_obj != 0) {
1420 dsl_dataset_remove_from_next_clones(ds->ds_prev,
1421 dsphys->ds_next_snap_obj, tx);
1422 VERIFY0(zap_add_int(mos,
1423 next_clones_obj, dsobj, tx));
1428 * If we have a reference-reservation on this dataset, we will
1429 * need to increase the amount of refreservation being charged
1430 * since our unique space is going to zero.
1432 if (ds->ds_reserved) {
1434 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
1435 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes,
1437 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV,
1441 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1442 dsl_dataset_phys(ds)->ds_deadlist_obj =
1443 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
1444 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
1445 dsl_deadlist_close(&ds->ds_deadlist);
1446 dsl_deadlist_open(&ds->ds_deadlist, mos,
1447 dsl_dataset_phys(ds)->ds_deadlist_obj);
1448 dsl_deadlist_add_key(&ds->ds_deadlist,
1449 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
1451 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg);
1452 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj;
1453 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg;
1454 dsl_dataset_phys(ds)->ds_unique_bytes = 0;
1455 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE)
1456 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE;
1458 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj,
1459 snapname, 8, 1, &dsobj, tx));
1462 dsl_dataset_rele(ds->ds_prev, ds);
1463 VERIFY0(dsl_dataset_hold_obj(dp,
1464 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev));
1466 dsl_scan_ds_snapshotted(ds, tx);
1468 dsl_dir_snap_cmtime_update(ds->ds_dir);
1470 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, "");
1474 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx)
1476 dsl_dataset_snapshot_arg_t *ddsa = arg;
1477 dsl_pool_t *dp = dmu_tx_pool(tx);
1480 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL);
1481 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) {
1484 char dsname[ZFS_MAX_DATASET_NAME_LEN];
1486 name = nvpair_name(pair);
1487 atp = strchr(name, '@');
1488 (void) strlcpy(dsname, name, atp - name + 1);
1489 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds));
1491 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx);
1492 if (ddsa->ddsa_props != NULL) {
1493 dsl_props_set_sync_impl(ds->ds_prev,
1494 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx);
1496 dsl_dataset_rele(ds, FTAG);
1501 * The snapshots must all be in the same pool.
1502 * All-or-nothing: if there are any failures, nothing will be modified.
1505 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
1507 dsl_dataset_snapshot_arg_t ddsa;
1509 boolean_t needsuspend;
1513 nvlist_t *suspended = NULL;
1515 pair = nvlist_next_nvpair(snaps, NULL);
1518 firstname = nvpair_name(pair);
1520 error = spa_open(firstname, &spa, FTAG);
1523 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1524 spa_close(spa, FTAG);
1527 suspended = fnvlist_alloc();
1528 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1529 pair = nvlist_next_nvpair(snaps, pair)) {
1530 char fsname[ZFS_MAX_DATASET_NAME_LEN];
1531 char *snapname = nvpair_name(pair);
1535 atp = strchr(snapname, '@');
1537 error = SET_ERROR(EINVAL);
1540 (void) strlcpy(fsname, snapname, atp - snapname + 1);
1542 error = zil_suspend(fsname, &cookie);
1545 fnvlist_add_uint64(suspended, fsname,
1550 ddsa.ddsa_snaps = snaps;
1551 ddsa.ddsa_props = props;
1552 ddsa.ddsa_errors = errors;
1553 ddsa.ddsa_cr = CRED();
1556 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check,
1557 dsl_dataset_snapshot_sync, &ddsa,
1558 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL);
1561 if (suspended != NULL) {
1562 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL;
1563 pair = nvlist_next_nvpair(suspended, pair)) {
1564 zil_resume((void *)(uintptr_t)
1565 fnvpair_value_uint64(pair));
1567 fnvlist_free(suspended);
1573 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
1574 pair = nvlist_next_nvpair(snaps, pair)) {
1575 char *snapname = nvpair_name(pair);
1576 zvol_create_minors(snapname);
1584 typedef struct dsl_dataset_snapshot_tmp_arg {
1585 const char *ddsta_fsname;
1586 const char *ddsta_snapname;
1587 minor_t ddsta_cleanup_minor;
1588 const char *ddsta_htag;
1589 } dsl_dataset_snapshot_tmp_arg_t;
1592 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx)
1594 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1595 dsl_pool_t *dp = dmu_tx_pool(tx);
1599 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds);
1603 /* NULL cred means no limit check for tmp snapshot */
1604 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname,
1605 tx, B_FALSE, 0, NULL);
1607 dsl_dataset_rele(ds, FTAG);
1611 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) {
1612 dsl_dataset_rele(ds, FTAG);
1613 return (SET_ERROR(ENOTSUP));
1615 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag,
1618 dsl_dataset_rele(ds, FTAG);
1622 dsl_dataset_rele(ds, FTAG);
1627 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx)
1629 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg;
1630 dsl_pool_t *dp = dmu_tx_pool(tx);
1633 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds));
1635 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx);
1636 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag,
1637 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx);
1638 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx);
1640 dsl_dataset_rele(ds, FTAG);
1644 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
1645 minor_t cleanup_minor, const char *htag)
1647 dsl_dataset_snapshot_tmp_arg_t ddsta;
1650 boolean_t needsuspend;
1653 ddsta.ddsta_fsname = fsname;
1654 ddsta.ddsta_snapname = snapname;
1655 ddsta.ddsta_cleanup_minor = cleanup_minor;
1656 ddsta.ddsta_htag = htag;
1658 error = spa_open(fsname, &spa, FTAG);
1661 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1662 spa_close(spa, FTAG);
1665 error = zil_suspend(fsname, &cookie);
1670 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check,
1671 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED);
1679 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
1681 ASSERT(dmu_tx_is_syncing(tx));
1682 ASSERT(ds->ds_objset != NULL);
1683 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0);
1686 * in case we had to change ds_fsid_guid when we opened it,
1689 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1690 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid;
1692 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) {
1693 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1694 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1,
1695 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx));
1696 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1697 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1,
1698 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx));
1699 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
1700 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1,
1701 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx));
1702 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0;
1703 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0;
1704 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0;
1707 dmu_objset_sync(ds->ds_objset, zio, tx);
1709 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
1710 if (ds->ds_feature_activation_needed[f]) {
1711 if (ds->ds_feature_inuse[f])
1713 dsl_dataset_activate_feature(ds->ds_object, f, tx);
1714 ds->ds_feature_inuse[f] = B_TRUE;
1720 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1722 dsl_deadlist_t *dl = arg;
1723 dsl_deadlist_insert(dl, bp, tx);
1728 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx)
1730 objset_t *os = ds->ds_objset;
1732 bplist_iterate(&ds->ds_pending_deadlist,
1733 deadlist_enqueue_cb, &ds->ds_deadlist, tx);
1735 if (os->os_synced_dnodes != NULL) {
1736 multilist_destroy(os->os_synced_dnodes);
1737 os->os_synced_dnodes = NULL;
1740 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx)));
1742 dmu_buf_rele(ds->ds_dbuf, ds);
1746 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val)
1749 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
1753 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
1756 * There may be missing entries in ds_next_clones_obj
1757 * due to a bug in a previous version of the code.
1758 * Only trust it if it has the right number of entries.
1760 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1761 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj,
1764 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) {
1767 for (zap_cursor_init(&zc, mos,
1768 dsl_dataset_phys(ds)->ds_next_clones_obj);
1769 zap_cursor_retrieve(&zc, &za) == 0;
1770 zap_cursor_advance(&zc)) {
1771 dsl_dataset_t *clone;
1772 char buf[ZFS_MAX_DATASET_NAME_LEN];
1773 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
1774 za.za_first_integer, FTAG, &clone));
1775 dsl_dir_name(clone->ds_dir, buf);
1776 fnvlist_add_boolean(val, buf);
1777 dsl_dataset_rele(clone, FTAG);
1779 zap_cursor_fini(&zc);
1784 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv)
1786 nvlist_t *propval = fnvlist_alloc();
1790 * We use nvlist_alloc() instead of fnvlist_alloc() because the
1791 * latter would allocate the list with NV_UNIQUE_NAME flag.
1792 * As a result, every time a clone name is appended to the list
1793 * it would be (linearly) searched for for a duplicate name.
1794 * We already know that all clone names must be unique and we
1795 * want avoid the quadratic complexity of double-checking that
1796 * because we can have a large number of clones.
1798 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP));
1800 if (get_clones_stat_impl(ds, val) == 0) {
1801 fnvlist_add_nvlist(propval, ZPROP_VALUE, val);
1802 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES),
1807 nvlist_free(propval);
1811 * Returns a string that represents the receive resume stats token. It should
1812 * be freed with strfree().
1815 get_receive_resume_stats_impl(dsl_dataset_t *ds)
1817 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1819 if (dsl_dataset_has_resume_receive_state(ds)) {
1822 uint8_t *compressed;
1824 nvlist_t *token_nv = fnvlist_alloc();
1825 size_t packed_size, compressed_size;
1827 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1828 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) {
1829 fnvlist_add_uint64(token_nv, "fromguid", val);
1831 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1832 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) {
1833 fnvlist_add_uint64(token_nv, "object", val);
1835 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1836 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) {
1837 fnvlist_add_uint64(token_nv, "offset", val);
1839 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1840 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) {
1841 fnvlist_add_uint64(token_nv, "bytes", val);
1843 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1844 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) {
1845 fnvlist_add_uint64(token_nv, "toguid", val);
1848 if (zap_lookup(dp->dp_meta_objset, ds->ds_object,
1849 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) {
1850 fnvlist_add_string(token_nv, "toname", buf);
1852 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1853 DS_FIELD_RESUME_LARGEBLOCK) == 0) {
1854 fnvlist_add_boolean(token_nv, "largeblockok");
1856 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1857 DS_FIELD_RESUME_EMBEDOK) == 0) {
1858 fnvlist_add_boolean(token_nv, "embedok");
1860 if (zap_contains(dp->dp_meta_objset, ds->ds_object,
1861 DS_FIELD_RESUME_COMPRESSOK) == 0) {
1862 fnvlist_add_boolean(token_nv, "compressok");
1864 packed = fnvlist_pack(token_nv, &packed_size);
1865 fnvlist_free(token_nv);
1866 compressed = kmem_alloc(packed_size, KM_SLEEP);
1868 compressed_size = gzip_compress(packed, compressed,
1869 packed_size, packed_size, 6);
1872 fletcher_4_native(compressed, compressed_size, NULL, &cksum);
1874 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP);
1875 for (int i = 0; i < compressed_size; i++) {
1876 (void) sprintf(str + i * 2, "%02x", compressed[i]);
1878 str[compressed_size * 2] = '\0';
1879 char *propval = kmem_asprintf("%u-%llx-%llx-%s",
1880 ZFS_SEND_RESUME_TOKEN_VERSION,
1881 (longlong_t)cksum.zc_word[0],
1882 (longlong_t)packed_size, str);
1883 kmem_free(packed, packed_size);
1884 kmem_free(str, compressed_size * 2 + 1);
1885 kmem_free(compressed, packed_size);
1888 return (spa_strdup(""));
1892 * Returns a string that represents the receive resume stats token of the
1893 * dataset's child. It should be freed with strfree().
1896 get_child_receive_stats(dsl_dataset_t *ds)
1898 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
1899 dsl_dataset_t *recv_ds;
1900 dsl_dataset_name(ds, recvname);
1901 if (strlcat(recvname, "/", sizeof (recvname)) <
1902 sizeof (recvname) &&
1903 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
1904 sizeof (recvname) &&
1905 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG,
1907 char *propval = get_receive_resume_stats_impl(recv_ds);
1908 dsl_dataset_rele(recv_ds, FTAG);
1911 return (spa_strdup(""));
1915 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv)
1917 char *propval = get_receive_resume_stats_impl(ds);
1918 if (strcmp(propval, "") != 0) {
1919 dsl_prop_nvlist_add_string(nv,
1920 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval);
1922 char *childval = get_child_receive_stats(ds);
1923 if (strcmp(childval, "") != 0) {
1924 dsl_prop_nvlist_add_string(nv,
1925 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval);
1933 dsl_get_refratio(dsl_dataset_t *ds)
1935 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 :
1936 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 /
1937 dsl_dataset_phys(ds)->ds_compressed_bytes);
1942 dsl_get_logicalreferenced(dsl_dataset_t *ds)
1944 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes);
1948 dsl_get_compressratio(dsl_dataset_t *ds)
1950 if (ds->ds_is_snapshot) {
1951 return (dsl_get_refratio(ds));
1953 dsl_dir_t *dd = ds->ds_dir;
1954 mutex_enter(&dd->dd_lock);
1955 uint64_t val = dsl_dir_get_compressratio(dd);
1956 mutex_exit(&dd->dd_lock);
1962 dsl_get_used(dsl_dataset_t *ds)
1964 if (ds->ds_is_snapshot) {
1965 return (dsl_dataset_phys(ds)->ds_unique_bytes);
1967 dsl_dir_t *dd = ds->ds_dir;
1968 mutex_enter(&dd->dd_lock);
1969 uint64_t val = dsl_dir_get_used(dd);
1970 mutex_exit(&dd->dd_lock);
1976 dsl_get_creation(dsl_dataset_t *ds)
1978 return (dsl_dataset_phys(ds)->ds_creation_time);
1982 dsl_get_creationtxg(dsl_dataset_t *ds)
1984 return (dsl_dataset_phys(ds)->ds_creation_txg);
1988 dsl_get_refquota(dsl_dataset_t *ds)
1990 return (ds->ds_quota);
1994 dsl_get_refreservation(dsl_dataset_t *ds)
1996 return (ds->ds_reserved);
2000 dsl_get_guid(dsl_dataset_t *ds)
2002 return (dsl_dataset_phys(ds)->ds_guid);
2006 dsl_get_unique(dsl_dataset_t *ds)
2008 return (dsl_dataset_phys(ds)->ds_unique_bytes);
2012 dsl_get_objsetid(dsl_dataset_t *ds)
2014 return (ds->ds_object);
2018 dsl_get_userrefs(dsl_dataset_t *ds)
2020 return (ds->ds_userrefs);
2024 dsl_get_defer_destroy(dsl_dataset_t *ds)
2026 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
2030 dsl_get_referenced(dsl_dataset_t *ds)
2032 return (dsl_dataset_phys(ds)->ds_referenced_bytes);
2036 dsl_get_numclones(dsl_dataset_t *ds)
2038 ASSERT(ds->ds_is_snapshot);
2039 return (dsl_dataset_phys(ds)->ds_num_children - 1);
2043 dsl_get_inconsistent(dsl_dataset_t *ds)
2045 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ?
2050 dsl_get_available(dsl_dataset_t *ds)
2052 uint64_t refdbytes = dsl_get_referenced(ds);
2053 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir,
2055 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
2057 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2059 if (ds->ds_quota != 0) {
2061 * Adjust available bytes according to refquota
2063 if (refdbytes < ds->ds_quota) {
2064 availbytes = MIN(availbytes,
2065 ds->ds_quota - refdbytes);
2070 return (availbytes);
2074 dsl_get_written(dsl_dataset_t *ds, uint64_t *written)
2076 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2077 dsl_dataset_t *prev;
2078 int err = dsl_dataset_hold_obj(dp,
2079 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
2081 uint64_t comp, uncomp;
2082 err = dsl_dataset_space_written(prev, ds, written,
2084 dsl_dataset_rele(prev, FTAG);
2090 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2093 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap)
2095 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2096 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
2097 dsl_dataset_name(ds->ds_prev, snap);
2105 * Returns the mountpoint property and source for the given dataset in the value
2106 * and source buffers. The value buffer must be at least as large as MAXPATHLEN
2107 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN.
2108 * Returns 0 on success and an error on failure.
2111 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value,
2115 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2117 /* Retrieve the mountpoint value stored in the zap opbject */
2118 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1,
2119 ZAP_MAXVALUELEN, value, source);
2124 /* Process the dsname and source to find the full mountpoint string */
2125 if (value[0] == '/') {
2126 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
2128 const char *relpath;
2131 * If we inherit the mountpoint, even from a dataset
2132 * with a received value, the source will be the path of
2133 * the dataset we inherit from. If source is
2134 * ZPROP_SOURCE_VAL_RECVD, the received value is not
2137 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2140 ASSERT0(strncmp(dsname, source, strlen(source)));
2141 relpath = dsname + strlen(source);
2142 if (relpath[0] == '/')
2146 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN);
2149 * Special case an alternate root of '/'. This will
2150 * avoid having multiple leading slashes in the
2153 if (strcmp(root, "/") == 0)
2157 * If the mountpoint is '/' then skip over this
2158 * if we are obtaining either an alternate root or
2159 * an inherited mountpoint.
2162 if (value[1] == '\0' && (root[0] != '\0' ||
2163 relpath[0] != '\0'))
2166 if (relpath[0] == '\0') {
2167 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s",
2170 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s",
2171 root, mnt, relpath[0] == '@' ? "" : "/",
2174 kmem_free(buf, ZAP_MAXVALUELEN);
2176 /* 'legacy' or 'none' */
2177 (void) snprintf(value, ZAP_MAXVALUELEN, "%s", value);
2183 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
2185 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2187 ASSERT(dsl_pool_config_held(dp));
2189 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO,
2190 dsl_get_refratio(ds));
2191 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED,
2192 dsl_get_logicalreferenced(ds));
2193 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
2194 dsl_get_compressratio(ds));
2195 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
2198 if (ds->ds_is_snapshot) {
2199 get_clones_stat(ds, nv);
2201 char buf[ZFS_MAX_DATASET_NAME_LEN];
2202 if (dsl_get_prev_snap(ds, buf) == 0)
2203 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP,
2205 dsl_dir_stats(ds->ds_dir, nv);
2208 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE,
2209 dsl_get_available(ds));
2210 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
2211 dsl_get_referenced(ds));
2212 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
2213 dsl_get_creation(ds));
2214 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
2215 dsl_get_creationtxg(ds));
2216 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA,
2217 dsl_get_refquota(ds));
2218 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION,
2219 dsl_get_refreservation(ds));
2220 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID,
2222 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE,
2223 dsl_get_unique(ds));
2224 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID,
2225 dsl_get_objsetid(ds));
2226 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS,
2227 dsl_get_userrefs(ds));
2228 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
2229 dsl_get_defer_destroy(ds));
2231 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) {
2233 if (dsl_get_written(ds, &written) == 0) {
2234 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN,
2239 if (!dsl_dataset_is_snapshot(ds)) {
2241 * A failed "newfs" (e.g. full) resumable receive leaves
2242 * the stats set on this dataset. Check here for the prop.
2244 get_receive_resume_stats(ds, nv);
2247 * A failed incremental resumable receive leaves the
2248 * stats set on our child named "%recv". Check the child
2251 /* 6 extra bytes for /%recv */
2252 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
2253 dsl_dataset_t *recv_ds;
2254 dsl_dataset_name(ds, recvname);
2255 if (strlcat(recvname, "/", sizeof (recvname)) <
2256 sizeof (recvname) &&
2257 strlcat(recvname, recv_clone_name, sizeof (recvname)) <
2258 sizeof (recvname) &&
2259 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) {
2260 get_receive_resume_stats(recv_ds, nv);
2261 dsl_dataset_rele(recv_ds, FTAG);
2267 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
2269 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2270 ASSERT(dsl_pool_config_held(dp));
2272 stat->dds_creation_txg = dsl_get_creationtxg(ds);
2273 stat->dds_inconsistent = dsl_get_inconsistent(ds);
2274 stat->dds_guid = dsl_get_guid(ds);
2275 stat->dds_origin[0] = '\0';
2276 if (ds->ds_is_snapshot) {
2277 stat->dds_is_snapshot = B_TRUE;
2278 stat->dds_num_clones = dsl_get_numclones(ds);
2280 stat->dds_is_snapshot = B_FALSE;
2281 stat->dds_num_clones = 0;
2283 if (dsl_dir_is_clone(ds->ds_dir)) {
2284 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin);
2290 dsl_dataset_fsid_guid(dsl_dataset_t *ds)
2292 return (ds->ds_fsid_guid);
2296 dsl_dataset_space(dsl_dataset_t *ds,
2297 uint64_t *refdbytesp, uint64_t *availbytesp,
2298 uint64_t *usedobjsp, uint64_t *availobjsp)
2300 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes;
2301 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
2302 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes)
2304 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes;
2305 if (ds->ds_quota != 0) {
2307 * Adjust available bytes according to refquota
2309 if (*refdbytesp < ds->ds_quota)
2310 *availbytesp = MIN(*availbytesp,
2311 ds->ds_quota - *refdbytesp);
2315 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2316 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp);
2317 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2318 *availobjsp = DN_MAX_OBJECT - *usedobjsp;
2322 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
2324 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2327 ASSERT(dsl_pool_config_held(dp));
2330 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2331 birth = dsl_dataset_get_blkptr(ds)->blk_birth;
2332 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2333 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
2334 objset_t *os, *os_snap;
2336 * It may be that only the ZIL differs, because it was
2337 * reset in the head. Don't count that as being
2340 if (dmu_objset_from_ds(ds, &os) != 0)
2342 if (dmu_objset_from_ds(snap, &os_snap) != 0)
2344 return (bcmp(&os->os_phys->os_meta_dnode,
2345 &os_snap->os_phys->os_meta_dnode,
2346 sizeof (os->os_phys->os_meta_dnode)) != 0);
2351 typedef struct dsl_dataset_rename_snapshot_arg {
2352 const char *ddrsa_fsname;
2353 const char *ddrsa_oldsnapname;
2354 const char *ddrsa_newsnapname;
2355 boolean_t ddrsa_recursive;
2357 } dsl_dataset_rename_snapshot_arg_t;
2361 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp,
2362 dsl_dataset_t *hds, void *arg)
2364 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2368 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2370 /* ignore nonexistent snapshots */
2371 return (error == ENOENT ? 0 : error);
2374 /* new name should not exist */
2375 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val);
2377 error = SET_ERROR(EEXIST);
2378 else if (error == ENOENT)
2381 /* dataset name + 1 for the "@" + the new snapshot name must fit */
2382 if (dsl_dir_namelen(hds->ds_dir) + 1 +
2383 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN)
2384 error = SET_ERROR(ENAMETOOLONG);
2390 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx)
2392 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2393 dsl_pool_t *dp = dmu_tx_pool(tx);
2397 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds);
2401 if (ddrsa->ddrsa_recursive) {
2402 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2403 dsl_dataset_rename_snapshot_check_impl, ddrsa,
2406 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa);
2408 dsl_dataset_rele(hds, FTAG);
2413 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp,
2414 dsl_dataset_t *hds, void *arg)
2418 char *oldname, *newname;
2421 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2424 dmu_tx_t *tx = ddrsa->ddrsa_tx;
2427 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val);
2428 ASSERT(error == 0 || error == ENOENT);
2429 if (error == ENOENT) {
2430 /* ignore nonexistent snapshots */
2434 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds));
2436 /* log before we change the name */
2437 spa_history_log_internal_ds(ds, "rename", tx,
2438 "-> @%s", ddrsa->ddrsa_newsnapname);
2440 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx,
2442 mutex_enter(&ds->ds_lock);
2443 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname);
2444 mutex_exit(&ds->ds_lock);
2445 VERIFY0(zap_add(dp->dp_meta_objset,
2446 dsl_dataset_phys(hds)->ds_snapnames_zapobj,
2447 ds->ds_snapname, 8, 1, &ds->ds_object, tx));
2451 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2452 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
2453 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2454 ddrsa->ddrsa_oldsnapname);
2455 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname,
2456 ddrsa->ddrsa_newsnapname);
2457 zfsvfs_update_fromname(oldname, newname);
2458 zvol_rename_minors(oldname, newname);
2459 kmem_free(newname, MAXPATHLEN);
2460 kmem_free(oldname, MAXPATHLEN);
2463 dsl_dataset_rele(ds, FTAG);
2469 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx)
2471 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg;
2472 dsl_pool_t *dp = dmu_tx_pool(tx);
2475 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds));
2476 ddrsa->ddrsa_tx = tx;
2477 if (ddrsa->ddrsa_recursive) {
2478 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object,
2479 dsl_dataset_rename_snapshot_sync_impl, ddrsa,
2482 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa));
2484 dsl_dataset_rele(hds, FTAG);
2488 dsl_dataset_rename_snapshot(const char *fsname,
2489 const char *oldsnapname, const char *newsnapname, boolean_t recursive)
2491 dsl_dataset_rename_snapshot_arg_t ddrsa;
2493 ddrsa.ddrsa_fsname = fsname;
2494 ddrsa.ddrsa_oldsnapname = oldsnapname;
2495 ddrsa.ddrsa_newsnapname = newsnapname;
2496 ddrsa.ddrsa_recursive = recursive;
2498 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check,
2499 dsl_dataset_rename_snapshot_sync, &ddrsa,
2500 1, ZFS_SPACE_CHECK_RESERVED));
2504 * If we're doing an ownership handoff, we need to make sure that there is
2505 * only one long hold on the dataset. We're not allowed to change anything here
2506 * so we don't permanently release the long hold or regular hold here. We want
2507 * to do this only when syncing to avoid the dataset unexpectedly going away
2508 * when we release the long hold.
2511 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx)
2515 if (!dmu_tx_is_syncing(tx))
2518 if (owner != NULL) {
2519 VERIFY3P(ds->ds_owner, ==, owner);
2520 dsl_dataset_long_rele(ds, owner);
2523 held = dsl_dataset_long_held(ds);
2526 dsl_dataset_long_hold(ds, owner);
2529 return (SET_ERROR(EBUSY));
2535 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx)
2537 dsl_dataset_rollback_arg_t *ddra = arg;
2538 dsl_pool_t *dp = dmu_tx_pool(tx);
2540 int64_t unused_refres_delta;
2543 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds);
2547 /* must not be a snapshot */
2548 if (ds->ds_is_snapshot) {
2549 dsl_dataset_rele(ds, FTAG);
2550 return (SET_ERROR(EINVAL));
2553 /* must have a most recent snapshot */
2554 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) {
2555 dsl_dataset_rele(ds, FTAG);
2556 return (SET_ERROR(ESRCH));
2560 * No rollback to a snapshot created in the current txg, because
2561 * the rollback may dirty the dataset and create blocks that are
2562 * not reachable from the rootbp while having a birth txg that
2563 * falls into the snapshot's range.
2565 if (dmu_tx_is_syncing(tx) &&
2566 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) {
2567 dsl_dataset_rele(ds, FTAG);
2568 return (SET_ERROR(EAGAIN));
2572 * If the expected target snapshot is specified, then check that
2573 * the latest snapshot is it.
2575 if (ddra->ddra_tosnap != NULL) {
2576 dsl_dataset_t *snapds;
2578 /* Check if the target snapshot exists at all. */
2579 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds);
2582 * ESRCH is used to signal that the target snapshot does
2583 * not exist, while ENOENT is used to report that
2584 * the rolled back dataset does not exist.
2585 * ESRCH is also used to cover other cases where the
2586 * target snapshot is not related to the dataset being
2587 * rolled back such as being in a different pool.
2589 if (error == ENOENT || error == EXDEV)
2590 error = SET_ERROR(ESRCH);
2591 dsl_dataset_rele(ds, FTAG);
2594 ASSERT(snapds->ds_is_snapshot);
2596 /* Check if the snapshot is the latest snapshot indeed. */
2597 if (snapds != ds->ds_prev) {
2599 * Distinguish between the case where the only problem
2600 * is intervening snapshots (EEXIST) vs the snapshot
2601 * not being a valid target for rollback (ESRCH).
2603 if (snapds->ds_dir == ds->ds_dir ||
2604 (dsl_dir_is_clone(ds->ds_dir) &&
2605 dsl_dir_phys(ds->ds_dir)->dd_origin_obj ==
2606 snapds->ds_object)) {
2607 error = SET_ERROR(EEXIST);
2609 error = SET_ERROR(ESRCH);
2611 dsl_dataset_rele(snapds, FTAG);
2612 dsl_dataset_rele(ds, FTAG);
2615 dsl_dataset_rele(snapds, FTAG);
2618 /* must not have any bookmarks after the most recent snapshot */
2619 nvlist_t *proprequest = fnvlist_alloc();
2620 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG));
2621 nvlist_t *bookmarks = fnvlist_alloc();
2622 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks);
2623 fnvlist_free(proprequest);
2625 dsl_dataset_rele(ds, FTAG);
2628 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL);
2629 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) {
2631 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair),
2632 zfs_prop_to_name(ZFS_PROP_CREATETXG));
2633 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value");
2634 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) {
2635 fnvlist_free(bookmarks);
2636 dsl_dataset_rele(ds, FTAG);
2637 return (SET_ERROR(EEXIST));
2640 fnvlist_free(bookmarks);
2642 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx);
2644 dsl_dataset_rele(ds, FTAG);
2649 * Check if the snap we are rolling back to uses more than
2652 if (ds->ds_quota != 0 &&
2653 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) {
2654 dsl_dataset_rele(ds, FTAG);
2655 return (SET_ERROR(EDQUOT));
2659 * When we do the clone swap, we will temporarily use more space
2660 * due to the refreservation (the head will no longer have any
2661 * unique space, so the entire amount of the refreservation will need
2662 * to be free). We will immediately destroy the clone, freeing
2663 * this space, but the freeing happens over many txg's.
2665 unused_refres_delta = (int64_t)MIN(ds->ds_reserved,
2666 dsl_dataset_phys(ds)->ds_unique_bytes);
2668 if (unused_refres_delta > 0 &&
2669 unused_refres_delta >
2670 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) {
2671 dsl_dataset_rele(ds, FTAG);
2672 return (SET_ERROR(ENOSPC));
2675 dsl_dataset_rele(ds, FTAG);
2680 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx)
2682 dsl_dataset_rollback_arg_t *ddra = arg;
2683 dsl_pool_t *dp = dmu_tx_pool(tx);
2684 dsl_dataset_t *ds, *clone;
2686 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
2688 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
2690 dsl_dataset_name(ds->ds_prev, namebuf);
2691 fnvlist_add_string(ddra->ddra_result, "target", namebuf);
2693 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
2694 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
2696 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone));
2698 dsl_dataset_clone_swap_sync_impl(clone, ds, tx);
2699 dsl_dataset_zero_zil(ds, tx);
2701 dsl_destroy_head_sync_impl(clone, tx);
2703 dsl_dataset_rele(clone, FTAG);
2704 dsl_dataset_rele(ds, FTAG);
2708 * Rolls back the given filesystem or volume to the most recent snapshot.
2709 * The name of the most recent snapshot will be returned under key "target"
2710 * in the result nvlist.
2713 * - The existing dataset MUST be owned by the specified owner at entry
2714 * - Upon return, dataset will still be held by the same owner, whether we
2717 * This mode is required any time the existing filesystem is mounted. See
2718 * notes above zfs_suspend_fs() for further details.
2721 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
2724 dsl_dataset_rollback_arg_t ddra;
2726 ddra.ddra_fsname = fsname;
2727 ddra.ddra_tosnap = tosnap;
2728 ddra.ddra_owner = owner;
2729 ddra.ddra_result = result;
2731 return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
2732 dsl_dataset_rollback_sync, &ddra,
2733 1, ZFS_SPACE_CHECK_RESERVED));
2736 struct promotenode {
2741 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
2742 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp,
2744 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag);
2747 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx)
2749 dsl_dataset_promote_arg_t *ddpa = arg;
2750 dsl_pool_t *dp = dmu_tx_pool(tx);
2752 struct promotenode *snap;
2753 dsl_dataset_t *origin_ds;
2757 size_t max_snap_len;
2758 boolean_t conflicting_snaps;
2760 err = promote_hold(ddpa, dp, FTAG);
2764 hds = ddpa->ddpa_clone;
2765 snap = list_head(&ddpa->shared_snaps);
2766 origin_ds = snap->ds;
2767 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1;
2769 snap = list_head(&ddpa->origin_snaps);
2771 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) {
2772 promote_rele(ddpa, FTAG);
2773 return (SET_ERROR(EXDEV));
2777 * Compute and check the amount of space to transfer. Since this is
2778 * so expensive, don't do the preliminary check.
2780 if (!dmu_tx_is_syncing(tx)) {
2781 promote_rele(ddpa, FTAG);
2785 /* compute origin's new unique space */
2786 snap = list_tail(&ddpa->clone_snaps);
2787 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2788 origin_ds->ds_object);
2789 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
2790 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX,
2791 &ddpa->unique, &unused, &unused);
2794 * Walk the snapshots that we are moving
2796 * Compute space to transfer. Consider the incremental changes
2797 * to used by each snapshot:
2798 * (my used) = (prev's used) + (blocks born) - (blocks killed)
2799 * So each snapshot gave birth to:
2800 * (blocks born) = (my used) - (prev's used) + (blocks killed)
2801 * So a sequence would look like:
2802 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0)
2803 * Which simplifies to:
2804 * uN + kN + kN-1 + ... + k1 + k0
2805 * Note however, if we stop before we reach the ORIGIN we get:
2806 * uN + kN + kN-1 + ... + kM - uM-1
2808 conflicting_snaps = B_FALSE;
2810 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes;
2811 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes;
2812 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes;
2813 for (snap = list_head(&ddpa->shared_snaps); snap;
2814 snap = list_next(&ddpa->shared_snaps, snap)) {
2815 uint64_t val, dlused, dlcomp, dluncomp;
2816 dsl_dataset_t *ds = snap->ds;
2821 * If there are long holds, we won't be able to evict
2824 if (dsl_dataset_long_held(ds)) {
2825 err = SET_ERROR(EBUSY);
2829 /* Check that the snapshot name does not conflict */
2830 VERIFY0(dsl_dataset_get_snapname(ds));
2831 if (strlen(ds->ds_snapname) >= max_snap_len) {
2832 err = SET_ERROR(ENAMETOOLONG);
2835 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val);
2837 fnvlist_add_boolean(ddpa->err_ds,
2838 snap->ds->ds_snapname);
2839 conflicting_snaps = B_TRUE;
2840 } else if (err != ENOENT) {
2844 /* The very first snapshot does not have a deadlist */
2845 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0)
2848 dsl_deadlist_space(&ds->ds_deadlist,
2849 &dlused, &dlcomp, &dluncomp);
2850 ddpa->used += dlused;
2851 ddpa->comp += dlcomp;
2852 ddpa->uncomp += dluncomp;
2856 * In order to return the full list of conflicting snapshots, we check
2857 * whether there was a conflict after traversing all of them.
2859 if (conflicting_snaps) {
2860 err = SET_ERROR(EEXIST);
2865 * If we are a clone of a clone then we never reached ORIGIN,
2866 * so we need to subtract out the clone origin's used space.
2868 if (ddpa->origin_origin) {
2870 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes;
2872 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes;
2874 dsl_dataset_phys(ddpa->origin_origin)->
2875 ds_uncompressed_bytes;
2878 /* Check that there is enough space and limit headroom here */
2879 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir,
2880 0, ss_mv_cnt, ddpa->used, ddpa->cr);
2885 * Compute the amounts of space that will be used by snapshots
2886 * after the promotion (for both origin and clone). For each,
2887 * it is the amount of space that will be on all of their
2888 * deadlists (that was not born before their new origin).
2890 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
2894 * Note, typically this will not be a clone of a clone,
2895 * so dd_origin_txg will be < TXG_INITIAL, so
2896 * these snaplist_space() -> dsl_deadlist_space_range()
2897 * calls will be fast because they do not have to
2898 * iterate over all bps.
2900 snap = list_head(&ddpa->origin_snaps);
2901 err = snaplist_space(&ddpa->shared_snaps,
2902 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
2906 err = snaplist_space(&ddpa->clone_snaps,
2907 snap->ds->ds_dir->dd_origin_txg, &space);
2910 ddpa->cloneusedsnap += space;
2912 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags &
2913 DD_FLAG_USED_BREAKDOWN) {
2914 err = snaplist_space(&ddpa->origin_snaps,
2915 dsl_dataset_phys(origin_ds)->ds_creation_txg,
2916 &ddpa->originusedsnap);
2922 promote_rele(ddpa, FTAG);
2927 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx)
2929 dsl_dataset_promote_arg_t *ddpa = arg;
2930 dsl_pool_t *dp = dmu_tx_pool(tx);
2932 struct promotenode *snap;
2933 dsl_dataset_t *origin_ds;
2934 dsl_dataset_t *origin_head;
2936 dsl_dir_t *odd = NULL;
2937 uint64_t oldnext_obj;
2939 #if defined(__FreeBSD__) && defined(_KERNEL)
2940 char *oldname, *newname;
2943 VERIFY0(promote_hold(ddpa, dp, FTAG));
2944 hds = ddpa->ddpa_clone;
2946 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE);
2948 snap = list_head(&ddpa->shared_snaps);
2949 origin_ds = snap->ds;
2952 snap = list_head(&ddpa->origin_snaps);
2953 origin_head = snap->ds;
2956 * We need to explicitly open odd, since origin_ds's dd will be
2959 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object,
2962 /* change origin's next snap */
2963 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx);
2964 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj;
2965 snap = list_tail(&ddpa->clone_snaps);
2966 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
2967 origin_ds->ds_object);
2968 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
2970 /* change the origin's next clone */
2971 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) {
2972 dsl_dataset_remove_from_next_clones(origin_ds,
2973 snap->ds->ds_object, tx);
2974 VERIFY0(zap_add_int(dp->dp_meta_objset,
2975 dsl_dataset_phys(origin_ds)->ds_next_clones_obj,
2980 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2981 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object);
2982 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj;
2983 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg;
2984 dmu_buf_will_dirty(odd->dd_dbuf, tx);
2985 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object;
2986 origin_head->ds_dir->dd_origin_txg =
2987 dsl_dataset_phys(origin_ds)->ds_creation_txg;
2989 /* change dd_clone entries */
2990 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
2991 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2992 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx));
2993 VERIFY0(zap_add_int(dp->dp_meta_objset,
2994 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2995 hds->ds_object, tx));
2997 VERIFY0(zap_remove_int(dp->dp_meta_objset,
2998 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones,
2999 origin_head->ds_object, tx));
3000 if (dsl_dir_phys(dd)->dd_clones == 0) {
3001 dsl_dir_phys(dd)->dd_clones =
3002 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES,
3003 DMU_OT_NONE, 0, tx);
3005 VERIFY0(zap_add_int(dp->dp_meta_objset,
3006 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx));
3009 #if defined(__FreeBSD__) && defined(_KERNEL)
3010 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */
3011 mutex_enter(&spa_namespace_lock);
3013 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
3014 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
3017 /* move snapshots to this dir */
3018 for (snap = list_head(&ddpa->shared_snaps); snap;
3019 snap = list_next(&ddpa->shared_snaps, snap)) {
3020 dsl_dataset_t *ds = snap->ds;
3023 * Property callbacks are registered to a particular
3024 * dsl_dir. Since ours is changing, evict the objset
3025 * so that they will be unregistered from the old dsl_dir.
3027 if (ds->ds_objset) {
3028 dmu_objset_evict(ds->ds_objset);
3029 ds->ds_objset = NULL;
3032 /* move snap name entry */
3033 VERIFY0(dsl_dataset_get_snapname(ds));
3034 VERIFY0(dsl_dataset_snap_remove(origin_head,
3035 ds->ds_snapname, tx, B_TRUE));
3036 VERIFY0(zap_add(dp->dp_meta_objset,
3037 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname,
3038 8, 1, &ds->ds_object, tx));
3039 dsl_fs_ss_count_adjust(hds->ds_dir, 1,
3040 DD_FIELD_SNAPSHOT_COUNT, tx);
3042 /* change containing dsl_dir */
3043 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3044 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object);
3045 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object;
3046 ASSERT3P(ds->ds_dir, ==, odd);
3047 dsl_dir_rele(ds->ds_dir, ds);
3048 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object,
3049 NULL, ds, &ds->ds_dir));
3051 #if defined(__FreeBSD__) && defined(_KERNEL)
3052 dsl_dataset_name(ds, newname);
3053 zfsvfs_update_fromname(oldname, newname);
3054 zvol_rename_minors(oldname, newname);
3057 /* move any clone references */
3058 if (dsl_dataset_phys(ds)->ds_next_clones_obj &&
3059 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
3063 for (zap_cursor_init(&zc, dp->dp_meta_objset,
3064 dsl_dataset_phys(ds)->ds_next_clones_obj);
3065 zap_cursor_retrieve(&zc, &za) == 0;
3066 zap_cursor_advance(&zc)) {
3067 dsl_dataset_t *cnds;
3070 if (za.za_first_integer == oldnext_obj) {
3072 * We've already moved the
3073 * origin's reference.
3078 VERIFY0(dsl_dataset_hold_obj(dp,
3079 za.za_first_integer, FTAG, &cnds));
3080 o = dsl_dir_phys(cnds->ds_dir)->
3081 dd_head_dataset_obj;
3083 VERIFY0(zap_remove_int(dp->dp_meta_objset,
3084 dsl_dir_phys(odd)->dd_clones, o, tx));
3085 VERIFY0(zap_add_int(dp->dp_meta_objset,
3086 dsl_dir_phys(dd)->dd_clones, o, tx));
3087 dsl_dataset_rele(cnds, FTAG);
3089 zap_cursor_fini(&zc);
3092 ASSERT(!dsl_prop_hascb(ds));
3095 #if defined(__FreeBSD__) && defined(_KERNEL)
3096 mutex_exit(&spa_namespace_lock);
3098 kmem_free(newname, MAXPATHLEN);
3099 kmem_free(oldname, MAXPATHLEN);
3102 * Change space accounting.
3103 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either
3104 * both be valid, or both be 0 (resulting in delta == 0). This
3105 * is true for each of {clone,origin} independently.
3108 delta = ddpa->cloneusedsnap -
3109 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP];
3110 ASSERT3S(delta, >=, 0);
3111 ASSERT3U(ddpa->used, >=, delta);
3112 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx);
3113 dsl_dir_diduse_space(dd, DD_USED_HEAD,
3114 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx);
3116 delta = ddpa->originusedsnap -
3117 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP];
3118 ASSERT3S(delta, <=, 0);
3119 ASSERT3U(ddpa->used, >=, -delta);
3120 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx);
3121 dsl_dir_diduse_space(odd, DD_USED_HEAD,
3122 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx);
3124 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique;
3126 /* log history record */
3127 spa_history_log_internal_ds(hds, "promote", tx, "");
3129 dsl_dir_rele(odd, FTAG);
3130 promote_rele(ddpa, FTAG);
3134 * Make a list of dsl_dataset_t's for the snapshots between first_obj
3135 * (exclusive) and last_obj (inclusive). The list will be in reverse
3136 * order (last_obj will be the list_head()). If first_obj == 0, do all
3137 * snapshots back to this dataset's origin.
3140 snaplist_make(dsl_pool_t *dp,
3141 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag)
3143 uint64_t obj = last_obj;
3145 list_create(l, sizeof (struct promotenode),
3146 offsetof(struct promotenode, link));
3148 while (obj != first_obj) {
3150 struct promotenode *snap;
3153 err = dsl_dataset_hold_obj(dp, obj, tag, &ds);
3154 ASSERT(err != ENOENT);
3159 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj;
3161 snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
3163 list_insert_tail(l, snap);
3164 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3171 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep)
3173 struct promotenode *snap;
3176 for (snap = list_head(l); snap; snap = list_next(l, snap)) {
3177 uint64_t used, comp, uncomp;
3178 dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3179 mintxg, UINT64_MAX, &used, &comp, &uncomp);
3186 snaplist_destroy(list_t *l, void *tag)
3188 struct promotenode *snap;
3190 if (l == NULL || !list_link_active(&l->list_head))
3193 while ((snap = list_tail(l)) != NULL) {
3194 list_remove(l, snap);
3195 dsl_dataset_rele(snap->ds, tag);
3196 kmem_free(snap, sizeof (*snap));
3202 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag)
3206 struct promotenode *snap;
3208 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag,
3212 dd = ddpa->ddpa_clone->ds_dir;
3214 if (ddpa->ddpa_clone->ds_is_snapshot ||
3215 !dsl_dir_is_clone(dd)) {
3216 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3217 return (SET_ERROR(EINVAL));
3220 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj,
3221 &ddpa->shared_snaps, tag);
3225 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object,
3226 &ddpa->clone_snaps, tag);
3230 snap = list_head(&ddpa->shared_snaps);
3231 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
3232 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj,
3233 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
3234 &ddpa->origin_snaps, tag);
3238 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
3239 error = dsl_dataset_hold_obj(dp,
3240 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
3241 tag, &ddpa->origin_origin);
3247 promote_rele(ddpa, tag);
3252 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag)
3254 snaplist_destroy(&ddpa->shared_snaps, tag);
3255 snaplist_destroy(&ddpa->clone_snaps, tag);
3256 snaplist_destroy(&ddpa->origin_snaps, tag);
3257 if (ddpa->origin_origin != NULL)
3258 dsl_dataset_rele(ddpa->origin_origin, tag);
3259 dsl_dataset_rele(ddpa->ddpa_clone, tag);
3265 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled
3266 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.)
3269 dsl_dataset_promote(const char *name, char *conflsnap)
3271 dsl_dataset_promote_arg_t ddpa = { 0 };
3274 nvpair_t *snap_pair;
3278 * We will modify space proportional to the number of
3279 * snapshots. Compute numsnaps.
3281 error = dmu_objset_hold(name, FTAG, &os);
3284 error = zap_count(dmu_objset_pool(os)->dp_meta_objset,
3285 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj,
3287 dmu_objset_rele(os, FTAG);
3291 ddpa.ddpa_clonename = name;
3292 ddpa.err_ds = fnvlist_alloc();
3295 error = dsl_sync_task(name, dsl_dataset_promote_check,
3296 dsl_dataset_promote_sync, &ddpa,
3297 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED);
3300 * Return the first conflicting snapshot found.
3302 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL);
3303 if (snap_pair != NULL && conflsnap != NULL)
3304 (void) strcpy(conflsnap, nvpair_name(snap_pair));
3306 fnvlist_free(ddpa.err_ds);
3311 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
3312 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx)
3315 * "slack" factor for received datasets with refquota set on them.
3316 * See the bottom of this function for details on its use.
3318 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
3319 int64_t unused_refres_delta;
3321 /* they should both be heads */
3322 if (clone->ds_is_snapshot ||
3323 origin_head->ds_is_snapshot)
3324 return (SET_ERROR(EINVAL));
3326 /* if we are not forcing, the branch point should be just before them */
3327 if (!force && clone->ds_prev != origin_head->ds_prev)
3328 return (SET_ERROR(EINVAL));
3330 /* clone should be the clone (unless they are unrelated) */
3331 if (clone->ds_prev != NULL &&
3332 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap &&
3333 origin_head->ds_dir != clone->ds_prev->ds_dir)
3334 return (SET_ERROR(EINVAL));
3336 /* the clone should be a child of the origin */
3337 if (clone->ds_dir->dd_parent != origin_head->ds_dir)
3338 return (SET_ERROR(EINVAL));
3340 /* origin_head shouldn't be modified unless 'force' */
3342 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev))
3343 return (SET_ERROR(ETXTBSY));
3345 /* origin_head should have no long holds (e.g. is not mounted) */
3346 if (dsl_dataset_handoff_check(origin_head, owner, tx))
3347 return (SET_ERROR(EBUSY));
3349 /* check amount of any unconsumed refreservation */
3350 unused_refres_delta =
3351 (int64_t)MIN(origin_head->ds_reserved,
3352 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3353 (int64_t)MIN(origin_head->ds_reserved,
3354 dsl_dataset_phys(clone)->ds_unique_bytes);
3356 if (unused_refres_delta > 0 &&
3357 unused_refres_delta >
3358 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE))
3359 return (SET_ERROR(ENOSPC));
3362 * The clone can't be too much over the head's refquota.
3364 * To ensure that the entire refquota can be used, we allow one
3365 * transaction to exceed the the refquota. Therefore, this check
3366 * needs to also allow for the space referenced to be more than the
3367 * refquota. The maximum amount of space that one transaction can use
3368 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this
3369 * overage ensures that we are able to receive a filesystem that
3370 * exceeds the refquota on the source system.
3372 * So that overage is the refquota_slack we use below.
3374 if (origin_head->ds_quota != 0 &&
3375 dsl_dataset_phys(clone)->ds_referenced_bytes >
3376 origin_head->ds_quota + refquota_slack)
3377 return (SET_ERROR(EDQUOT));
3383 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
3384 dsl_dataset_t *origin_head, dmu_tx_t *tx)
3386 dsl_pool_t *dp = dmu_tx_pool(tx);
3387 int64_t unused_refres_delta;
3389 ASSERT(clone->ds_reserved == 0);
3391 * NOTE: On DEBUG kernels there could be a race between this and
3392 * the check function if spa_asize_inflation is adjusted...
3394 ASSERT(origin_head->ds_quota == 0 ||
3395 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota +
3396 DMU_MAX_ACCESS * spa_asize_inflation);
3397 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev);
3400 * Swap per-dataset feature flags.
3402 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
3403 if (!(spa_feature_table[f].fi_flags &
3404 ZFEATURE_FLAG_PER_DATASET)) {
3405 ASSERT(!clone->ds_feature_inuse[f]);
3406 ASSERT(!origin_head->ds_feature_inuse[f]);
3410 boolean_t clone_inuse = clone->ds_feature_inuse[f];
3411 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f];
3414 dsl_dataset_deactivate_feature(clone->ds_object, f, tx);
3415 clone->ds_feature_inuse[f] = B_FALSE;
3417 if (origin_head_inuse) {
3418 dsl_dataset_deactivate_feature(origin_head->ds_object,
3420 origin_head->ds_feature_inuse[f] = B_FALSE;
3423 dsl_dataset_activate_feature(origin_head->ds_object,
3425 origin_head->ds_feature_inuse[f] = B_TRUE;
3427 if (origin_head_inuse) {
3428 dsl_dataset_activate_feature(clone->ds_object, f, tx);
3429 clone->ds_feature_inuse[f] = B_TRUE;
3433 dmu_buf_will_dirty(clone->ds_dbuf, tx);
3434 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
3436 if (clone->ds_objset != NULL) {
3437 dmu_objset_evict(clone->ds_objset);
3438 clone->ds_objset = NULL;
3441 if (origin_head->ds_objset != NULL) {
3442 dmu_objset_evict(origin_head->ds_objset);
3443 origin_head->ds_objset = NULL;
3446 unused_refres_delta =
3447 (int64_t)MIN(origin_head->ds_reserved,
3448 dsl_dataset_phys(origin_head)->ds_unique_bytes) -
3449 (int64_t)MIN(origin_head->ds_reserved,
3450 dsl_dataset_phys(clone)->ds_unique_bytes);
3453 * Reset origin's unique bytes, if it exists.
3455 if (clone->ds_prev) {
3456 dsl_dataset_t *origin = clone->ds_prev;
3457 uint64_t comp, uncomp;
3459 dmu_buf_will_dirty(origin->ds_dbuf, tx);
3460 dsl_deadlist_space_range(&clone->ds_deadlist,
3461 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX,
3462 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp);
3467 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG);
3468 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG);
3470 tmp = dsl_dataset_phys(origin_head)->ds_bp;
3471 dsl_dataset_phys(origin_head)->ds_bp =
3472 dsl_dataset_phys(clone)->ds_bp;
3473 dsl_dataset_phys(clone)->ds_bp = tmp;
3474 rrw_exit(&origin_head->ds_bp_rwlock, FTAG);
3475 rrw_exit(&clone->ds_bp_rwlock, FTAG);
3478 /* set dd_*_bytes */
3480 int64_t dused, dcomp, duncomp;
3481 uint64_t cdl_used, cdl_comp, cdl_uncomp;
3482 uint64_t odl_used, odl_comp, odl_uncomp;
3484 ASSERT3U(dsl_dir_phys(clone->ds_dir)->
3485 dd_used_breakdown[DD_USED_SNAP], ==, 0);
3487 dsl_deadlist_space(&clone->ds_deadlist,
3488 &cdl_used, &cdl_comp, &cdl_uncomp);
3489 dsl_deadlist_space(&origin_head->ds_deadlist,
3490 &odl_used, &odl_comp, &odl_uncomp);
3492 dused = dsl_dataset_phys(clone)->ds_referenced_bytes +
3494 (dsl_dataset_phys(origin_head)->ds_referenced_bytes +
3496 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes +
3498 (dsl_dataset_phys(origin_head)->ds_compressed_bytes +
3500 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes +
3502 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes +
3505 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD,
3506 dused, dcomp, duncomp, tx);
3507 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD,
3508 -dused, -dcomp, -duncomp, tx);
3511 * The difference in the space used by snapshots is the
3512 * difference in snapshot space due to the head's
3513 * deadlist (since that's the only thing that's
3514 * changing that affects the snapused).
3516 dsl_deadlist_space_range(&clone->ds_deadlist,
3517 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3518 &cdl_used, &cdl_comp, &cdl_uncomp);
3519 dsl_deadlist_space_range(&origin_head->ds_deadlist,
3520 origin_head->ds_dir->dd_origin_txg, UINT64_MAX,
3521 &odl_used, &odl_comp, &odl_uncomp);
3522 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used,
3523 DD_USED_HEAD, DD_USED_SNAP, NULL);
3526 /* swap ds_*_bytes */
3527 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes,
3528 dsl_dataset_phys(clone)->ds_referenced_bytes);
3529 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes,
3530 dsl_dataset_phys(clone)->ds_compressed_bytes);
3531 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes,
3532 dsl_dataset_phys(clone)->ds_uncompressed_bytes);
3533 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes,
3534 dsl_dataset_phys(clone)->ds_unique_bytes);
3536 /* apply any parent delta for change in unconsumed refreservation */
3537 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV,
3538 unused_refres_delta, 0, 0, tx);
3543 dsl_deadlist_close(&clone->ds_deadlist);
3544 dsl_deadlist_close(&origin_head->ds_deadlist);
3545 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
3546 dsl_dataset_phys(clone)->ds_deadlist_obj);
3547 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
3548 dsl_dataset_phys(clone)->ds_deadlist_obj);
3549 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
3550 dsl_dataset_phys(origin_head)->ds_deadlist_obj);
3552 dsl_scan_ds_clone_swapped(origin_head, clone, tx);
3554 spa_history_log_internal_ds(clone, "clone swap", tx,
3555 "parent=%s", origin_head->ds_dir->dd_myname);
3559 * Given a pool name and a dataset object number in that pool,
3560 * return the name of that dataset.
3563 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
3569 error = dsl_pool_hold(pname, FTAG, &dp);
3573 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
3575 dsl_dataset_name(ds, buf);
3576 dsl_dataset_rele(ds, FTAG);
3578 dsl_pool_rele(dp, FTAG);
3584 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
3585 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv)
3589 ASSERT3S(asize, >, 0);
3592 * *ref_rsrv is the portion of asize that will come from any
3593 * unconsumed refreservation space.
3597 mutex_enter(&ds->ds_lock);
3599 * Make a space adjustment for reserved bytes.
3601 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) {
3603 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3605 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes);
3607 asize - MIN(asize, parent_delta(ds, asize + inflight));
3610 if (!check_quota || ds->ds_quota == 0) {
3611 mutex_exit(&ds->ds_lock);
3615 * If they are requesting more space, and our current estimate
3616 * is over quota, they get to try again unless the actual
3617 * on-disk is over quota and there are no pending changes (which
3618 * may free up space for us).
3620 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >=
3623 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota)
3624 error = SET_ERROR(ERESTART);
3626 error = SET_ERROR(EDQUOT);
3628 mutex_exit(&ds->ds_lock);
3633 typedef struct dsl_dataset_set_qr_arg {
3634 const char *ddsqra_name;
3635 zprop_source_t ddsqra_source;
3636 uint64_t ddsqra_value;
3637 } dsl_dataset_set_qr_arg_t;
3642 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx)
3644 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3645 dsl_pool_t *dp = dmu_tx_pool(tx);
3650 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA)
3651 return (SET_ERROR(ENOTSUP));
3653 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3657 if (ds->ds_is_snapshot) {
3658 dsl_dataset_rele(ds, FTAG);
3659 return (SET_ERROR(EINVAL));
3662 error = dsl_prop_predict(ds->ds_dir,
3663 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3664 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3666 dsl_dataset_rele(ds, FTAG);
3671 dsl_dataset_rele(ds, FTAG);
3675 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes ||
3676 newval < ds->ds_reserved) {
3677 dsl_dataset_rele(ds, FTAG);
3678 return (SET_ERROR(ENOSPC));
3681 dsl_dataset_rele(ds, FTAG);
3686 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx)
3688 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3689 dsl_pool_t *dp = dmu_tx_pool(tx);
3693 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3695 dsl_prop_set_sync_impl(ds,
3696 zfs_prop_to_name(ZFS_PROP_REFQUOTA),
3697 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
3698 &ddsqra->ddsqra_value, tx);
3700 VERIFY0(dsl_prop_get_int_ds(ds,
3701 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval));
3703 if (ds->ds_quota != newval) {
3704 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3705 ds->ds_quota = newval;
3707 dsl_dataset_rele(ds, FTAG);
3711 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
3714 dsl_dataset_set_qr_arg_t ddsqra;
3716 ddsqra.ddsqra_name = dsname;
3717 ddsqra.ddsqra_source = source;
3718 ddsqra.ddsqra_value = refquota;
3720 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check,
3721 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
3725 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx)
3727 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3728 dsl_pool_t *dp = dmu_tx_pool(tx);
3731 uint64_t newval, unique;
3733 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION)
3734 return (SET_ERROR(ENOTSUP));
3736 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
3740 if (ds->ds_is_snapshot) {
3741 dsl_dataset_rele(ds, FTAG);
3742 return (SET_ERROR(EINVAL));
3745 error = dsl_prop_predict(ds->ds_dir,
3746 zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3747 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
3749 dsl_dataset_rele(ds, FTAG);
3754 * If we are doing the preliminary check in open context, the
3755 * space estimates may be inaccurate.
3757 if (!dmu_tx_is_syncing(tx)) {
3758 dsl_dataset_rele(ds, FTAG);
3762 mutex_enter(&ds->ds_lock);
3763 if (!DS_UNIQUE_IS_ACCURATE(ds))
3764 dsl_dataset_recalc_head_uniq(ds);
3765 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3766 mutex_exit(&ds->ds_lock);
3768 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) {
3769 uint64_t delta = MAX(unique, newval) -
3770 MAX(unique, ds->ds_reserved);
3773 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) ||
3774 (ds->ds_quota > 0 && newval > ds->ds_quota)) {
3775 dsl_dataset_rele(ds, FTAG);
3776 return (SET_ERROR(ENOSPC));
3780 dsl_dataset_rele(ds, FTAG);
3785 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
3786 zprop_source_t source, uint64_t value, dmu_tx_t *tx)
3792 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION),
3793 source, sizeof (value), 1, &value, tx);
3795 VERIFY0(dsl_prop_get_int_ds(ds,
3796 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval));
3798 dmu_buf_will_dirty(ds->ds_dbuf, tx);
3799 mutex_enter(&ds->ds_dir->dd_lock);
3800 mutex_enter(&ds->ds_lock);
3801 ASSERT(DS_UNIQUE_IS_ACCURATE(ds));
3802 unique = dsl_dataset_phys(ds)->ds_unique_bytes;
3803 delta = MAX(0, (int64_t)(newval - unique)) -
3804 MAX(0, (int64_t)(ds->ds_reserved - unique));
3805 ds->ds_reserved = newval;
3806 mutex_exit(&ds->ds_lock);
3808 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx);
3809 mutex_exit(&ds->ds_dir->dd_lock);
3813 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx)
3815 dsl_dataset_set_qr_arg_t *ddsqra = arg;
3816 dsl_pool_t *dp = dmu_tx_pool(tx);
3819 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
3820 dsl_dataset_set_refreservation_sync_impl(ds,
3821 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx);
3822 dsl_dataset_rele(ds, FTAG);
3826 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
3827 uint64_t refreservation)
3829 dsl_dataset_set_qr_arg_t ddsqra;
3831 ddsqra.ddsqra_name = dsname;
3832 ddsqra.ddsqra_source = source;
3833 ddsqra.ddsqra_value = refreservation;
3835 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check,
3836 dsl_dataset_set_refreservation_sync, &ddsqra,
3837 0, ZFS_SPACE_CHECK_NONE));
3841 * Return (in *usedp) the amount of space written in new that is not
3842 * present in oldsnap. New may be a snapshot or the head. Old must be
3843 * a snapshot before new, in new's filesystem (or its origin). If not then
3844 * fail and return EINVAL.
3846 * The written space is calculated by considering two components: First, we
3847 * ignore any freed space, and calculate the written as new's used space
3848 * minus old's used space. Next, we add in the amount of space that was freed
3849 * between the two snapshots, thus reducing new's used space relative to old's.
3850 * Specifically, this is the space that was born before old->ds_creation_txg,
3851 * and freed before new (ie. on new's deadlist or a previous deadlist).
3853 * space freed [---------------------]
3854 * snapshots ---O-------O--------O-------O------
3858 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
3859 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3863 dsl_pool_t *dp = new->ds_dir->dd_pool;
3865 ASSERT(dsl_pool_config_held(dp));
3868 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes;
3869 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes;
3872 *compp += dsl_dataset_phys(new)->ds_compressed_bytes;
3873 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes;
3876 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes;
3877 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes;
3879 snapobj = new->ds_object;
3880 while (snapobj != oldsnap->ds_object) {
3881 dsl_dataset_t *snap;
3882 uint64_t used, comp, uncomp;
3884 if (snapobj == new->ds_object) {
3887 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
3892 if (dsl_dataset_phys(snap)->ds_prev_snap_txg ==
3893 dsl_dataset_phys(oldsnap)->ds_creation_txg) {
3895 * The blocks in the deadlist can not be born after
3896 * ds_prev_snap_txg, so get the whole deadlist space,
3897 * which is more efficient (especially for old-format
3898 * deadlists). Unfortunately the deadlist code
3899 * doesn't have enough information to make this
3900 * optimization itself.
3902 dsl_deadlist_space(&snap->ds_deadlist,
3903 &used, &comp, &uncomp);
3905 dsl_deadlist_space_range(&snap->ds_deadlist,
3906 0, dsl_dataset_phys(oldsnap)->ds_creation_txg,
3907 &used, &comp, &uncomp);
3914 * If we get to the beginning of the chain of snapshots
3915 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap
3916 * was not a snapshot of/before new.
3918 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
3920 dsl_dataset_rele(snap, FTAG);
3922 err = SET_ERROR(EINVAL);
3931 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap,
3932 * lastsnap, and all snapshots in between are deleted.
3934 * blocks that would be freed [---------------------------]
3935 * snapshots ---O-------O--------O-------O--------O
3936 * firstsnap lastsnap
3938 * This is the set of blocks that were born after the snap before firstsnap,
3939 * (birth > firstsnap->prev_snap_txg) and died before the snap after the
3940 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
3941 * We calculate this by iterating over the relevant deadlists (from the snap
3942 * after lastsnap, backward to the snap after firstsnap), summing up the
3943 * space on the deadlist that was born after the snap before firstsnap.
3946 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap,
3947 dsl_dataset_t *lastsnap,
3948 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp)
3952 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool;
3954 ASSERT(firstsnap->ds_is_snapshot);
3955 ASSERT(lastsnap->ds_is_snapshot);
3958 * Check that the snapshots are in the same dsl_dir, and firstsnap
3959 * is before lastsnap.
3961 if (firstsnap->ds_dir != lastsnap->ds_dir ||
3962 dsl_dataset_phys(firstsnap)->ds_creation_txg >
3963 dsl_dataset_phys(lastsnap)->ds_creation_txg)
3964 return (SET_ERROR(EINVAL));
3966 *usedp = *compp = *uncompp = 0;
3968 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj;
3969 while (snapobj != firstsnap->ds_object) {
3971 uint64_t used, comp, uncomp;
3973 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds);
3977 dsl_deadlist_space_range(&ds->ds_deadlist,
3978 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX,
3979 &used, &comp, &uncomp);
3984 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
3985 ASSERT3U(snapobj, !=, 0);
3986 dsl_dataset_rele(ds, FTAG);
3992 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
3993 * For example, they could both be snapshots of the same filesystem, and
3994 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
3995 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
3996 * filesystem. Or 'earlier' could be the origin's origin.
3998 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg.
4001 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
4002 uint64_t earlier_txg)
4004 dsl_pool_t *dp = later->ds_dir->dd_pool;
4008 ASSERT(dsl_pool_config_held(dp));
4009 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0);
4011 if (earlier_txg == 0)
4012 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg;
4014 if (later->ds_is_snapshot &&
4015 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg)
4018 if (later->ds_dir == earlier->ds_dir)
4020 if (!dsl_dir_is_clone(later->ds_dir))
4023 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object)
4025 dsl_dataset_t *origin;
4026 error = dsl_dataset_hold_obj(dp,
4027 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin);
4030 ret = dsl_dataset_is_before(origin, earlier, earlier_txg);
4031 dsl_dataset_rele(origin, FTAG);
4036 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx)
4038 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
4039 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx);
4043 dsl_dataset_is_zapified(dsl_dataset_t *ds)
4045 dmu_object_info_t doi;
4047 dmu_object_info_from_db(ds->ds_dbuf, &doi);
4048 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
4052 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds)
4054 return (dsl_dataset_is_zapified(ds) &&
4055 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset,
4056 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0);