4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Martin Matuska. All rights reserved.
25 * Copyright (c) 2014 Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 * Copyright (c) 2016 Actifio, Inc. All rights reserved.
28 * Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
32 #include <sys/dmu_objset.h>
33 #include <sys/dmu_tx.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_dir.h>
36 #include <sys/dsl_prop.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/dsl_deleg.h>
39 #include <sys/dmu_impl.h>
41 #include <sys/spa_impl.h>
42 #include <sys/metaslab.h>
46 #include <sys/sunddi.h>
47 #include <sys/zfeature.h>
48 #include <sys/policy.h>
49 #include <sys/zfs_znode.h>
51 #include "zfs_namecheck.h"
55 * Filesystem and Snapshot Limits
56 * ------------------------------
58 * These limits are used to restrict the number of filesystems and/or snapshots
59 * that can be created at a given level in the tree or below. A typical
60 * use-case is with a delegated dataset where the administrator wants to ensure
61 * that a user within the zone is not creating too many additional filesystems
62 * or snapshots, even though they're not exceeding their space quota.
64 * The filesystem and snapshot counts are stored as extensible properties. This
65 * capability is controlled by a feature flag and must be enabled to be used.
66 * Once enabled, the feature is not active until the first limit is set. At
67 * that point, future operations to create/destroy filesystems or snapshots
68 * will validate and update the counts.
70 * Because the count properties will not exist before the feature is active,
71 * the counts are updated when a limit is first set on an uninitialized
72 * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
73 * all of the nested filesystems/snapshots. Thus, a new leaf node has a
74 * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
75 * snapshot count properties on a node indicate uninitialized counts on that
76 * node.) When first setting a limit on an uninitialized node, the code starts
77 * at the filesystem with the new limit and descends into all sub-filesystems
78 * to add the count properties.
80 * In practice this is lightweight since a limit is typically set when the
81 * filesystem is created and thus has no children. Once valid, changing the
82 * limit value won't require a re-traversal since the counts are already valid.
83 * When recursively fixing the counts, if a node with a limit is encountered
84 * during the descent, the counts are known to be valid and there is no need to
85 * descend into that filesystem's children. The counts on filesystems above the
86 * one with the new limit will still be uninitialized, unless a limit is
87 * eventually set on one of those filesystems. The counts are always recursively
88 * updated when a limit is set on a dataset, unless there is already a limit.
89 * When a new limit value is set on a filesystem with an existing limit, it is
90 * possible for the new limit to be less than the current count at that level
91 * since a user who can change the limit is also allowed to exceed the limit.
93 * Once the feature is active, then whenever a filesystem or snapshot is
94 * created, the code recurses up the tree, validating the new count against the
95 * limit at each initialized level. In practice, most levels will not have a
96 * limit set. If there is a limit at any initialized level up the tree, the
97 * check must pass or the creation will fail. Likewise, when a filesystem or
98 * snapshot is destroyed, the counts are recursively adjusted all the way up
99 * the initizized nodes in the tree. Renaming a filesystem into different point
100 * in the tree will first validate, then update the counts on each branch up to
101 * the common ancestor. A receive will also validate the counts and then update
104 * An exception to the above behavior is that the limit is not enforced if the
105 * user has permission to modify the limit. This is primarily so that
106 * recursive snapshots in the global zone always work. We want to prevent a
107 * denial-of-service in which a lower level delegated dataset could max out its
108 * limit and thus block recursive snapshots from being taken in the global zone.
109 * Because of this, it is possible for the snapshot count to be over the limit
110 * and snapshots taken in the global zone could cause a lower level dataset to
111 * hit or exceed its limit. The administrator taking the global zone recursive
112 * snapshot should be aware of this side-effect and behave accordingly.
113 * For consistency, the filesystem limit is also not enforced if the user can
116 * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
117 * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
118 * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
119 * dsl_dir_init_fs_ss_count().
121 * There is a special case when we receive a filesystem that already exists. In
122 * this case a temporary clone name of %X is created (see dmu_recv_begin). We
123 * never update the filesystem counts for temporary clones.
125 * Likewise, we do not update the snapshot counts for temporary snapshots,
126 * such as those created by zfs diff.
129 extern inline dsl_dir_phys_t *dsl_dir_phys(dsl_dir_t *dd);
131 static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
133 typedef struct ddulrt_arg {
134 dsl_dir_t *ddulrta_dd;
139 dsl_dir_evict_async(void *dbu)
143 ASSERTV(dsl_pool_t *dp = dd->dd_pool);
147 for (t = 0; t < TXG_SIZE; t++) {
148 ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
149 ASSERT(dd->dd_tempreserved[t] == 0);
150 ASSERT(dd->dd_space_towrite[t] == 0);
154 dsl_dir_async_rele(dd->dd_parent, dd);
156 spa_async_close(dd->dd_pool->dp_spa, dd);
159 mutex_destroy(&dd->dd_lock);
160 kmem_free(dd, sizeof (dsl_dir_t));
164 dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
165 const char *tail, void *tag, dsl_dir_t **ddp)
169 dmu_object_info_t doi;
172 ASSERT(dsl_pool_config_held(dp));
174 err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
177 dd = dmu_buf_get_user(dbuf);
179 dmu_object_info_from_db(dbuf, &doi);
180 ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR);
181 ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t));
186 dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
187 dd->dd_object = ddobj;
191 if (dsl_dir_is_zapified(dd) &&
192 zap_contains(dp->dp_meta_objset, ddobj,
193 DD_FIELD_CRYPTO_KEY_OBJ) == 0) {
194 VERIFY0(zap_lookup(dp->dp_meta_objset,
195 ddobj, DD_FIELD_CRYPTO_KEY_OBJ,
196 sizeof (uint64_t), 1, &dd->dd_crypto_obj));
198 /* check for on-disk format errata */
199 if (dsl_dir_incompatible_encryption_version(dd)) {
200 dp->dp_spa->spa_errata =
201 ZPOOL_ERRATA_ZOL_6845_ENCRYPTION;
205 mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL);
208 dsl_dir_snap_cmtime_update(dd);
210 if (dsl_dir_phys(dd)->dd_parent_obj) {
211 err = dsl_dir_hold_obj(dp,
212 dsl_dir_phys(dd)->dd_parent_obj, NULL, dd,
220 err = zap_lookup(dp->dp_meta_objset,
221 dsl_dir_phys(dd->dd_parent)->
222 dd_child_dir_zapobj, tail,
223 sizeof (foundobj), 1, &foundobj);
224 ASSERT(err || foundobj == ddobj);
226 (void) strlcpy(dd->dd_myname, tail,
227 sizeof (dd->dd_myname));
229 err = zap_value_search(dp->dp_meta_objset,
230 dsl_dir_phys(dd->dd_parent)->
232 ddobj, 0, dd->dd_myname);
237 (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa));
240 if (dsl_dir_is_clone(dd)) {
241 dmu_buf_t *origin_bonus;
242 dsl_dataset_phys_t *origin_phys;
245 * We can't open the origin dataset, because
246 * that would require opening this dsl_dir.
247 * Just look at its phys directly instead.
249 err = dmu_bonus_hold(dp->dp_meta_objset,
250 dsl_dir_phys(dd)->dd_origin_obj, FTAG,
254 origin_phys = origin_bonus->db_data;
256 origin_phys->ds_creation_txg;
257 dmu_buf_rele(origin_bonus, FTAG);
260 dmu_buf_init_user(&dd->dd_dbu, NULL, dsl_dir_evict_async,
262 winner = dmu_buf_set_user_ie(dbuf, &dd->dd_dbu);
263 if (winner != NULL) {
265 dsl_dir_rele(dd->dd_parent, dd);
267 mutex_destroy(&dd->dd_lock);
268 kmem_free(dd, sizeof (dsl_dir_t));
271 spa_open_ref(dp->dp_spa, dd);
276 * The dsl_dir_t has both open-to-close and instantiate-to-evict
277 * holds on the spa. We need the open-to-close holds because
278 * otherwise the spa_refcnt wouldn't change when we open a
279 * dir which the spa also has open, so we could incorrectly
280 * think it was OK to unload/export/destroy the pool. We need
281 * the instantiate-to-evict hold because the dsl_dir_t has a
282 * pointer to the dd_pool, which has a pointer to the spa_t.
284 spa_open_ref(dp->dp_spa, tag);
285 ASSERT3P(dd->dd_pool, ==, dp);
286 ASSERT3U(dd->dd_object, ==, ddobj);
287 ASSERT3P(dd->dd_dbuf, ==, dbuf);
293 dsl_dir_rele(dd->dd_parent, dd);
295 mutex_destroy(&dd->dd_lock);
296 kmem_free(dd, sizeof (dsl_dir_t));
297 dmu_buf_rele(dbuf, tag);
302 dsl_dir_rele(dsl_dir_t *dd, void *tag)
304 dprintf_dd(dd, "%s\n", "");
305 spa_close(dd->dd_pool->dp_spa, tag);
306 dmu_buf_rele(dd->dd_dbuf, tag);
310 * Remove a reference to the given dsl dir that is being asynchronously
311 * released. Async releases occur from a taskq performing eviction of
312 * dsl datasets and dirs. This process is identical to a normal release
313 * with the exception of using the async API for releasing the reference on
317 dsl_dir_async_rele(dsl_dir_t *dd, void *tag)
319 dprintf_dd(dd, "%s\n", "");
320 spa_async_close(dd->dd_pool->dp_spa, tag);
321 dmu_buf_rele(dd->dd_dbuf, tag);
324 /* buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes */
326 dsl_dir_name(dsl_dir_t *dd, char *buf)
329 dsl_dir_name(dd->dd_parent, buf);
330 VERIFY3U(strlcat(buf, "/", ZFS_MAX_DATASET_NAME_LEN), <,
331 ZFS_MAX_DATASET_NAME_LEN);
335 if (!MUTEX_HELD(&dd->dd_lock)) {
337 * recursive mutex so that we can use
338 * dprintf_dd() with dd_lock held
340 mutex_enter(&dd->dd_lock);
341 VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
342 <, ZFS_MAX_DATASET_NAME_LEN);
343 mutex_exit(&dd->dd_lock);
345 VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
346 <, ZFS_MAX_DATASET_NAME_LEN);
350 /* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
352 dsl_dir_namelen(dsl_dir_t *dd)
357 /* parent's name + 1 for the "/" */
358 result = dsl_dir_namelen(dd->dd_parent) + 1;
361 if (!MUTEX_HELD(&dd->dd_lock)) {
362 /* see dsl_dir_name */
363 mutex_enter(&dd->dd_lock);
364 result += strlen(dd->dd_myname);
365 mutex_exit(&dd->dd_lock);
367 result += strlen(dd->dd_myname);
374 getcomponent(const char *path, char *component, const char **nextp)
378 if ((path == NULL) || (path[0] == '\0'))
379 return (SET_ERROR(ENOENT));
380 /* This would be a good place to reserve some namespace... */
381 p = strpbrk(path, "/@");
382 if (p && (p[1] == '/' || p[1] == '@')) {
383 /* two separators in a row */
384 return (SET_ERROR(EINVAL));
386 if (p == NULL || p == path) {
388 * if the first thing is an @ or /, it had better be an
389 * @ and it had better not have any more ats or slashes,
390 * and it had better have something after the @.
393 (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0'))
394 return (SET_ERROR(EINVAL));
395 if (strlen(path) >= ZFS_MAX_DATASET_NAME_LEN)
396 return (SET_ERROR(ENAMETOOLONG));
397 (void) strcpy(component, path);
399 } else if (p[0] == '/') {
400 if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
401 return (SET_ERROR(ENAMETOOLONG));
402 (void) strncpy(component, path, p - path);
403 component[p - path] = '\0';
405 } else if (p[0] == '@') {
407 * if the next separator is an @, there better not be
410 if (strchr(path, '/'))
411 return (SET_ERROR(EINVAL));
412 if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
413 return (SET_ERROR(ENAMETOOLONG));
414 (void) strncpy(component, path, p - path);
415 component[p - path] = '\0';
417 panic("invalid p=%p", (void *)p);
424 * Return the dsl_dir_t, and possibly the last component which couldn't
425 * be found in *tail. The name must be in the specified dsl_pool_t. This
426 * thread must hold the dp_config_rwlock for the pool. Returns NULL if the
427 * path is bogus, or if tail==NULL and we couldn't parse the whole name.
428 * (*tail)[0] == '@' means that the last component is a snapshot.
431 dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
432 dsl_dir_t **ddp, const char **tailp)
435 const char *spaname, *next, *nextnext = NULL;
440 buf = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
441 err = getcomponent(name, buf, &next);
445 /* Make sure the name is in the specified pool. */
446 spaname = spa_name(dp->dp_spa);
447 if (strcmp(buf, spaname) != 0) {
448 err = SET_ERROR(EXDEV);
452 ASSERT(dsl_pool_config_held(dp));
454 err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
459 while (next != NULL) {
461 err = getcomponent(next, buf, &nextnext);
464 ASSERT(next[0] != '\0');
467 dprintf("looking up %s in obj%lld\n",
468 buf, dsl_dir_phys(dd)->dd_child_dir_zapobj);
470 err = zap_lookup(dp->dp_meta_objset,
471 dsl_dir_phys(dd)->dd_child_dir_zapobj,
472 buf, sizeof (ddobj), 1, &ddobj);
479 err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_dd);
482 dsl_dir_rele(dd, tag);
488 dsl_dir_rele(dd, tag);
493 * It's an error if there's more than one component left, or
494 * tailp==NULL and there's any component left.
497 (tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
499 dsl_dir_rele(dd, tag);
500 dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
501 err = SET_ERROR(ENOENT);
508 kmem_free(buf, ZFS_MAX_DATASET_NAME_LEN);
513 * If the counts are already initialized for this filesystem and its
514 * descendants then do nothing, otherwise initialize the counts.
516 * The counts on this filesystem, and those below, may be uninitialized due to
517 * either the use of a pre-existing pool which did not support the
518 * filesystem/snapshot limit feature, or one in which the feature had not yet
521 * Recursively descend the filesystem tree and update the filesystem/snapshot
522 * counts on each filesystem below, then update the cumulative count on the
523 * current filesystem. If the filesystem already has a count set on it,
524 * then we know that its counts, and the counts on the filesystems below it,
525 * are already correct, so we don't have to update this filesystem.
528 dsl_dir_init_fs_ss_count(dsl_dir_t *dd, dmu_tx_t *tx)
530 uint64_t my_fs_cnt = 0;
531 uint64_t my_ss_cnt = 0;
532 dsl_pool_t *dp = dd->dd_pool;
533 objset_t *os = dp->dp_meta_objset;
538 ASSERT(spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT));
539 ASSERT(dsl_pool_config_held(dp));
540 ASSERT(dmu_tx_is_syncing(tx));
542 dsl_dir_zapify(dd, tx);
545 * If the filesystem count has already been initialized then we
546 * don't need to recurse down any further.
548 if (zap_contains(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0)
551 zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
552 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
554 /* Iterate my child dirs */
555 for (zap_cursor_init(zc, os, dsl_dir_phys(dd)->dd_child_dir_zapobj);
556 zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) {
560 VERIFY0(dsl_dir_hold_obj(dp, za->za_first_integer, NULL, FTAG,
564 * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and
565 * temporary datasets.
567 if (chld_dd->dd_myname[0] == '$' ||
568 chld_dd->dd_myname[0] == '%') {
569 dsl_dir_rele(chld_dd, FTAG);
573 my_fs_cnt++; /* count this child */
575 dsl_dir_init_fs_ss_count(chld_dd, tx);
577 VERIFY0(zap_lookup(os, chld_dd->dd_object,
578 DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count));
580 VERIFY0(zap_lookup(os, chld_dd->dd_object,
581 DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count));
584 dsl_dir_rele(chld_dd, FTAG);
587 /* Count my snapshots (we counted children's snapshots above) */
588 VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
589 dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds));
591 for (zap_cursor_init(zc, os, dsl_dataset_phys(ds)->ds_snapnames_zapobj);
592 zap_cursor_retrieve(zc, za) == 0;
593 zap_cursor_advance(zc)) {
594 /* Don't count temporary snapshots */
595 if (za->za_name[0] != '%')
600 dsl_dataset_rele(ds, FTAG);
602 kmem_free(zc, sizeof (zap_cursor_t));
603 kmem_free(za, sizeof (zap_attribute_t));
605 /* we're in a sync task, update counts */
606 dmu_buf_will_dirty(dd->dd_dbuf, tx);
607 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
608 sizeof (my_fs_cnt), 1, &my_fs_cnt, tx));
609 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
610 sizeof (my_ss_cnt), 1, &my_ss_cnt, tx));
614 dsl_dir_actv_fs_ss_limit_check(void *arg, dmu_tx_t *tx)
616 char *ddname = (char *)arg;
617 dsl_pool_t *dp = dmu_tx_pool(tx);
622 error = dsl_dataset_hold(dp, ddname, FTAG, &ds);
626 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
627 dsl_dataset_rele(ds, FTAG);
628 return (SET_ERROR(ENOTSUP));
632 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT) &&
633 dsl_dir_is_zapified(dd) &&
634 zap_contains(dp->dp_meta_objset, dd->dd_object,
635 DD_FIELD_FILESYSTEM_COUNT) == 0) {
636 dsl_dataset_rele(ds, FTAG);
637 return (SET_ERROR(EALREADY));
640 dsl_dataset_rele(ds, FTAG);
645 dsl_dir_actv_fs_ss_limit_sync(void *arg, dmu_tx_t *tx)
647 char *ddname = (char *)arg;
648 dsl_pool_t *dp = dmu_tx_pool(tx);
652 VERIFY0(dsl_dataset_hold(dp, ddname, FTAG, &ds));
654 spa = dsl_dataset_get_spa(ds);
656 if (!spa_feature_is_active(spa, SPA_FEATURE_FS_SS_LIMIT)) {
658 * Since the feature was not active and we're now setting a
659 * limit, increment the feature-active counter so that the
660 * feature becomes active for the first time.
662 * We are already in a sync task so we can update the MOS.
664 spa_feature_incr(spa, SPA_FEATURE_FS_SS_LIMIT, tx);
668 * Since we are now setting a non-UINT64_MAX limit on the filesystem,
669 * we need to ensure the counts are correct. Descend down the tree from
670 * this point and update all of the counts to be accurate.
672 dsl_dir_init_fs_ss_count(ds->ds_dir, tx);
674 dsl_dataset_rele(ds, FTAG);
678 * Make sure the feature is enabled and activate it if necessary.
679 * Since we're setting a limit, ensure the on-disk counts are valid.
680 * This is only called by the ioctl path when setting a limit value.
682 * We do not need to validate the new limit, since users who can change the
683 * limit are also allowed to exceed the limit.
686 dsl_dir_activate_fs_ss_limit(const char *ddname)
690 error = dsl_sync_task(ddname, dsl_dir_actv_fs_ss_limit_check,
691 dsl_dir_actv_fs_ss_limit_sync, (void *)ddname, 0,
692 ZFS_SPACE_CHECK_RESERVED);
694 if (error == EALREADY)
701 * Used to determine if the filesystem_limit or snapshot_limit should be
702 * enforced. We allow the limit to be exceeded if the user has permission to
703 * write the property value. We pass in the creds that we got in the open
704 * context since we will always be the GZ root in syncing context. We also have
705 * to handle the case where we are allowed to change the limit on the current
706 * dataset, but there may be another limit in the tree above.
708 * We can never modify these two properties within a non-global zone. In
709 * addition, the other checks are modeled on zfs_secpolicy_write_perms. We
710 * can't use that function since we are already holding the dp_config_rwlock.
711 * In addition, we already have the dd and dealing with snapshots is simplified
722 dsl_enforce_ds_ss_limits(dsl_dir_t *dd, zfs_prop_t prop, cred_t *cr)
724 enforce_res_t enforce = ENFORCE_ALWAYS;
729 ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
730 prop == ZFS_PROP_SNAPSHOT_LIMIT);
733 if (crgetzoneid(cr) != GLOBAL_ZONEID)
734 return (ENFORCE_ALWAYS);
736 if (secpolicy_zfs(cr) == 0)
737 return (ENFORCE_NEVER);
740 if ((obj = dsl_dir_phys(dd)->dd_head_dataset_obj) == 0)
741 return (ENFORCE_ALWAYS);
743 ASSERT(dsl_pool_config_held(dd->dd_pool));
745 if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0)
746 return (ENFORCE_ALWAYS);
748 if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL) || zoned) {
749 /* Only root can access zoned fs's from the GZ */
750 enforce = ENFORCE_ALWAYS;
752 if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0)
753 enforce = ENFORCE_ABOVE;
756 dsl_dataset_rele(ds, FTAG);
761 * Check if adding additional child filesystem(s) would exceed any filesystem
762 * limits or adding additional snapshot(s) would exceed any snapshot limits.
763 * The prop argument indicates which limit to check.
765 * Note that all filesystem limits up to the root (or the highest
766 * initialized) filesystem or the given ancestor must be satisfied.
769 dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop,
770 dsl_dir_t *ancestor, cred_t *cr)
772 objset_t *os = dd->dd_pool->dp_meta_objset;
773 uint64_t limit, count;
775 enforce_res_t enforce;
778 ASSERT(dsl_pool_config_held(dd->dd_pool));
779 ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
780 prop == ZFS_PROP_SNAPSHOT_LIMIT);
783 * If we're allowed to change the limit, don't enforce the limit
784 * e.g. this can happen if a snapshot is taken by an administrative
785 * user in the global zone (i.e. a recursive snapshot by root).
786 * However, we must handle the case of delegated permissions where we
787 * are allowed to change the limit on the current dataset, but there
788 * is another limit in the tree above.
790 enforce = dsl_enforce_ds_ss_limits(dd, prop, cr);
791 if (enforce == ENFORCE_NEVER)
795 * e.g. if renaming a dataset with no snapshots, count adjustment
801 if (prop == ZFS_PROP_SNAPSHOT_LIMIT) {
803 * We don't enforce the limit for temporary snapshots. This is
804 * indicated by a NULL cred_t argument.
809 count_prop = DD_FIELD_SNAPSHOT_COUNT;
811 count_prop = DD_FIELD_FILESYSTEM_COUNT;
815 * If an ancestor has been provided, stop checking the limit once we
816 * hit that dir. We need this during rename so that we don't overcount
817 * the check once we recurse up to the common ancestor.
823 * If we hit an uninitialized node while recursing up the tree, we can
824 * stop since we know there is no limit here (or above). The counts are
825 * not valid on this node and we know we won't touch this node's counts.
827 if (!dsl_dir_is_zapified(dd) || zap_lookup(os, dd->dd_object,
828 count_prop, sizeof (count), 1, &count) == ENOENT)
831 err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL,
836 /* Is there a limit which we've hit? */
837 if (enforce == ENFORCE_ALWAYS && (count + delta) > limit)
838 return (SET_ERROR(EDQUOT));
840 if (dd->dd_parent != NULL)
841 err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop,
848 * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
849 * parents. When a new filesystem/snapshot is created, increment the count on
850 * all parents, and when a filesystem/snapshot is destroyed, decrement the
854 dsl_fs_ss_count_adjust(dsl_dir_t *dd, int64_t delta, const char *prop,
858 objset_t *os = dd->dd_pool->dp_meta_objset;
861 ASSERT(dsl_pool_config_held(dd->dd_pool));
862 ASSERT(dmu_tx_is_syncing(tx));
863 ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 ||
864 strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0);
867 * When we receive an incremental stream into a filesystem that already
868 * exists, a temporary clone is created. We don't count this temporary
869 * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
870 * $MOS & $ORIGIN) objsets.
872 if ((dd->dd_myname[0] == '%' || dd->dd_myname[0] == '$') &&
873 strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0)
877 * e.g. if renaming a dataset with no snapshots, count adjustment is 0
883 * If we hit an uninitialized node while recursing up the tree, we can
884 * stop since we know the counts are not valid on this node and we
885 * know we shouldn't touch this node's counts. An uninitialized count
886 * on the node indicates that either the feature has not yet been
887 * activated or there are no limits on this part of the tree.
889 if (!dsl_dir_is_zapified(dd) || (err = zap_lookup(os, dd->dd_object,
890 prop, sizeof (count), 1, &count)) == ENOENT)
895 /* Use a signed verify to make sure we're not neg. */
896 VERIFY3S(count, >=, 0);
898 VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count,
901 /* Roll up this additional count into our ancestors */
902 if (dd->dd_parent != NULL)
903 dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx);
907 dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
910 objset_t *mos = dp->dp_meta_objset;
912 dsl_dir_phys_t *ddphys;
915 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
916 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
918 VERIFY0(zap_add(mos, dsl_dir_phys(pds)->dd_child_dir_zapobj,
919 name, sizeof (uint64_t), 1, &ddobj, tx));
921 /* it's the root dir */
922 VERIFY0(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
923 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
925 VERIFY0(dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
926 dmu_buf_will_dirty(dbuf, tx);
927 ddphys = dbuf->db_data;
929 ddphys->dd_creation_time = gethrestime_sec();
931 ddphys->dd_parent_obj = pds->dd_object;
933 /* update the filesystem counts */
934 dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx);
936 ddphys->dd_props_zapobj = zap_create(mos,
937 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
938 ddphys->dd_child_dir_zapobj = zap_create(mos,
939 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
940 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
941 ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
943 dmu_buf_rele(dbuf, FTAG);
949 dsl_dir_is_clone(dsl_dir_t *dd)
951 return (dsl_dir_phys(dd)->dd_origin_obj &&
952 (dd->dd_pool->dp_origin_snap == NULL ||
953 dsl_dir_phys(dd)->dd_origin_obj !=
954 dd->dd_pool->dp_origin_snap->ds_object));
958 dsl_dir_get_used(dsl_dir_t *dd)
960 return (dsl_dir_phys(dd)->dd_used_bytes);
964 dsl_dir_get_compressed(dsl_dir_t *dd)
966 return (dsl_dir_phys(dd)->dd_compressed_bytes);
970 dsl_dir_get_quota(dsl_dir_t *dd)
972 return (dsl_dir_phys(dd)->dd_quota);
976 dsl_dir_get_reservation(dsl_dir_t *dd)
978 return (dsl_dir_phys(dd)->dd_reserved);
982 dsl_dir_get_compressratio(dsl_dir_t *dd)
984 /* a fixed point number, 100x the ratio */
985 return (dsl_dir_phys(dd)->dd_compressed_bytes == 0 ? 100 :
986 (dsl_dir_phys(dd)->dd_uncompressed_bytes * 100 /
987 dsl_dir_phys(dd)->dd_compressed_bytes));
991 dsl_dir_get_logicalused(dsl_dir_t *dd)
993 return (dsl_dir_phys(dd)->dd_uncompressed_bytes);
997 dsl_dir_get_usedsnap(dsl_dir_t *dd)
999 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]);
1003 dsl_dir_get_usedds(dsl_dir_t *dd)
1005 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_HEAD]);
1009 dsl_dir_get_usedrefreserv(dsl_dir_t *dd)
1011 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_REFRSRV]);
1015 dsl_dir_get_usedchild(dsl_dir_t *dd)
1017 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD] +
1018 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD_RSRV]);
1022 dsl_dir_get_origin(dsl_dir_t *dd, char *buf)
1025 VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
1026 dsl_dir_phys(dd)->dd_origin_obj, FTAG, &ds));
1028 dsl_dataset_name(ds, buf);
1030 dsl_dataset_rele(ds, FTAG);
1034 dsl_dir_get_filesystem_count(dsl_dir_t *dd, uint64_t *count)
1036 if (dsl_dir_is_zapified(dd)) {
1037 objset_t *os = dd->dd_pool->dp_meta_objset;
1038 return (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
1039 sizeof (*count), 1, count));
1046 dsl_dir_get_snapshot_count(dsl_dir_t *dd, uint64_t *count)
1048 if (dsl_dir_is_zapified(dd)) {
1049 objset_t *os = dd->dd_pool->dp_meta_objset;
1050 return (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
1051 sizeof (*count), 1, count));
1058 dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
1060 mutex_enter(&dd->dd_lock);
1061 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA,
1062 dsl_dir_get_quota(dd));
1063 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
1064 dsl_dir_get_reservation(dd));
1065 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED,
1066 dsl_dir_get_logicalused(dd));
1067 if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
1068 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
1069 dsl_dir_get_usedsnap(dd));
1070 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
1071 dsl_dir_get_usedds(dd));
1072 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
1073 dsl_dir_get_usedrefreserv(dd));
1074 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
1075 dsl_dir_get_usedchild(dd));
1077 mutex_exit(&dd->dd_lock);
1080 if (dsl_dir_get_filesystem_count(dd, &count) == 0) {
1081 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_FILESYSTEM_COUNT,
1084 if (dsl_dir_get_snapshot_count(dd, &count) == 0) {
1085 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOT_COUNT,
1089 if (dsl_dir_is_clone(dd)) {
1090 char buf[ZFS_MAX_DATASET_NAME_LEN];
1091 dsl_dir_get_origin(dd, buf);
1092 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
1098 dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
1100 dsl_pool_t *dp = dd->dd_pool;
1102 ASSERT(dsl_dir_phys(dd));
1104 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) {
1105 /* up the hold count until we can be written out */
1106 dmu_buf_add_ref(dd->dd_dbuf, dd);
1111 parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
1113 uint64_t old_accounted = MAX(used, dsl_dir_phys(dd)->dd_reserved);
1114 uint64_t new_accounted =
1115 MAX(used + delta, dsl_dir_phys(dd)->dd_reserved);
1116 return (new_accounted - old_accounted);
1120 dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
1122 ASSERT(dmu_tx_is_syncing(tx));
1124 mutex_enter(&dd->dd_lock);
1125 ASSERT0(dd->dd_tempreserved[tx->tx_txg & TXG_MASK]);
1126 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
1127 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] / 1024);
1128 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] = 0;
1129 mutex_exit(&dd->dd_lock);
1131 /* release the hold from dsl_dir_dirty */
1132 dmu_buf_rele(dd->dd_dbuf, dd);
1136 dsl_dir_space_towrite(dsl_dir_t *dd)
1140 ASSERT(MUTEX_HELD(&dd->dd_lock));
1142 for (int i = 0; i < TXG_SIZE; i++) {
1143 space += dd->dd_space_towrite[i & TXG_MASK];
1144 ASSERT3U(dd->dd_space_towrite[i & TXG_MASK], >=, 0);
1150 * How much space would dd have available if ancestor had delta applied
1151 * to it? If ondiskonly is set, we're only interested in what's
1152 * on-disk, not estimated pending changes.
1155 dsl_dir_space_available(dsl_dir_t *dd,
1156 dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
1158 uint64_t parentspace, myspace, quota, used;
1161 * If there are no restrictions otherwise, assume we have
1162 * unlimited space available.
1165 parentspace = UINT64_MAX;
1167 if (dd->dd_parent != NULL) {
1168 parentspace = dsl_dir_space_available(dd->dd_parent,
1169 ancestor, delta, ondiskonly);
1172 mutex_enter(&dd->dd_lock);
1173 if (dsl_dir_phys(dd)->dd_quota != 0)
1174 quota = dsl_dir_phys(dd)->dd_quota;
1175 used = dsl_dir_phys(dd)->dd_used_bytes;
1177 used += dsl_dir_space_towrite(dd);
1179 if (dd->dd_parent == NULL) {
1180 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool,
1181 ZFS_SPACE_CHECK_NORMAL);
1182 quota = MIN(quota, poolsize);
1185 if (dsl_dir_phys(dd)->dd_reserved > used && parentspace != UINT64_MAX) {
1187 * We have some space reserved, in addition to what our
1190 parentspace += dsl_dir_phys(dd)->dd_reserved - used;
1193 if (dd == ancestor) {
1195 ASSERT(used >= -delta);
1197 if (parentspace != UINT64_MAX)
1198 parentspace -= delta;
1206 * the lesser of the space provided by our parent and
1207 * the space left in our quota
1209 myspace = MIN(parentspace, quota - used);
1212 mutex_exit(&dd->dd_lock);
1217 struct tempreserve {
1218 list_node_t tr_node;
1224 dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
1225 boolean_t ignorequota, list_t *tr_list,
1226 dmu_tx_t *tx, boolean_t first)
1230 struct tempreserve *tr;
1239 ASSERT3U(txg, !=, 0);
1240 ASSERT3S(asize, >, 0);
1242 mutex_enter(&dd->dd_lock);
1245 * Check against the dsl_dir's quota. We don't add in the delta
1246 * when checking for over-quota because they get one free hit.
1248 uint64_t est_inflight = dsl_dir_space_towrite(dd);
1249 for (int i = 0; i < TXG_SIZE; i++)
1250 est_inflight += dd->dd_tempreserved[i];
1251 uint64_t used_on_disk = dsl_dir_phys(dd)->dd_used_bytes;
1254 * On the first iteration, fetch the dataset's used-on-disk and
1255 * refreservation values. Also, if checkrefquota is set, test if
1256 * allocating this space would exceed the dataset's refquota.
1258 if (first && tx->tx_objset) {
1260 dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
1262 error = dsl_dataset_check_quota(ds, !netfree,
1263 asize, est_inflight, &used_on_disk, &ref_rsrv);
1265 mutex_exit(&dd->dd_lock);
1266 DMU_TX_STAT_BUMP(dmu_tx_quota);
1272 * If this transaction will result in a net free of space,
1273 * we want to let it through.
1275 if (ignorequota || netfree || dsl_dir_phys(dd)->dd_quota == 0)
1278 quota = dsl_dir_phys(dd)->dd_quota;
1281 * Adjust the quota against the actual pool size at the root
1282 * minus any outstanding deferred frees.
1283 * To ensure that it's possible to remove files from a full
1284 * pool without inducing transient overcommits, we throttle
1285 * netfree transactions against a quota that is slightly larger,
1286 * but still within the pool's allocation slop. In cases where
1287 * we're very close to full, this will allow a steady trickle of
1288 * removes to get through.
1290 uint64_t deferred = 0;
1291 if (dd->dd_parent == NULL) {
1292 uint64_t avail = dsl_pool_unreserved_space(dd->dd_pool,
1294 ZFS_SPACE_CHECK_RESERVED : ZFS_SPACE_CHECK_NORMAL);
1296 if (avail < quota) {
1303 * If they are requesting more space, and our current estimate
1304 * is over quota, they get to try again unless the actual
1305 * on-disk is over quota and there are no pending changes (which
1306 * may free up space for us).
1308 if (used_on_disk + est_inflight >= quota) {
1309 if (est_inflight > 0 || used_on_disk < quota ||
1310 (retval == ENOSPC && used_on_disk < quota + deferred))
1312 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
1313 "quota=%lluK tr=%lluK err=%d\n",
1314 used_on_disk>>10, est_inflight>>10,
1315 quota>>10, asize>>10, retval);
1316 mutex_exit(&dd->dd_lock);
1317 DMU_TX_STAT_BUMP(dmu_tx_quota);
1318 return (SET_ERROR(retval));
1321 /* We need to up our estimated delta before dropping dd_lock */
1322 dd->dd_tempreserved[txg & TXG_MASK] += asize;
1324 uint64_t parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
1326 mutex_exit(&dd->dd_lock);
1328 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
1330 tr->tr_size = asize;
1331 list_insert_tail(tr_list, tr);
1333 /* see if it's OK with our parent */
1334 if (dd->dd_parent != NULL && parent_rsrv != 0) {
1336 * Recurse on our parent without recursion. This has been
1337 * observed to be potentially large stack usage even within
1338 * the test suite. Largest seen stack was 7632 bytes on linux.
1342 asize = parent_rsrv;
1343 ignorequota = (dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
1345 goto top_of_function;
1353 * Reserve space in this dsl_dir, to be used in this tx's txg.
1354 * After the space has been dirtied (and dsl_dir_willuse_space()
1355 * has been called), the reservation should be canceled, using
1356 * dsl_dir_tempreserve_clear().
1359 dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
1360 boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx)
1370 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
1371 list_create(tr_list, sizeof (struct tempreserve),
1372 offsetof(struct tempreserve, tr_node));
1373 ASSERT3S(asize, >, 0);
1375 err = arc_tempreserve_space(dd->dd_pool->dp_spa, lsize, tx->tx_txg);
1377 struct tempreserve *tr;
1379 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
1380 tr->tr_size = lsize;
1381 list_insert_tail(tr_list, tr);
1383 if (err == EAGAIN) {
1385 * If arc_memory_throttle() detected that pageout
1386 * is running and we are low on memory, we delay new
1387 * non-pageout transactions to give pageout an
1390 * It is unfortunate to be delaying while the caller's
1393 txg_delay(dd->dd_pool, tx->tx_txg,
1394 MSEC2NSEC(10), MSEC2NSEC(10));
1395 err = SET_ERROR(ERESTART);
1400 err = dsl_dir_tempreserve_impl(dd, asize, netfree,
1401 B_FALSE, tr_list, tx, B_TRUE);
1405 dsl_dir_tempreserve_clear(tr_list, tx);
1407 *tr_cookiep = tr_list;
1413 * Clear a temporary reservation that we previously made with
1414 * dsl_dir_tempreserve_space().
1417 dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
1419 int txgidx = tx->tx_txg & TXG_MASK;
1420 list_t *tr_list = tr_cookie;
1421 struct tempreserve *tr;
1423 ASSERT3U(tx->tx_txg, !=, 0);
1425 if (tr_cookie == NULL)
1428 while ((tr = list_head(tr_list)) != NULL) {
1430 mutex_enter(&tr->tr_ds->dd_lock);
1431 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
1433 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
1434 mutex_exit(&tr->tr_ds->dd_lock);
1436 arc_tempreserve_clear(tr->tr_size);
1438 list_remove(tr_list, tr);
1439 kmem_free(tr, sizeof (struct tempreserve));
1442 kmem_free(tr_list, sizeof (list_t));
1446 * This should be called from open context when we think we're going to write
1447 * or free space, for example when dirtying data. Be conservative; it's okay
1448 * to write less space or free more, but we don't want to write more or free
1449 * less than the amount specified.
1451 * NOTE: The behavior of this function is identical to the Illumos / FreeBSD
1452 * version however it has been adjusted to use an iterative rather then
1453 * recursive algorithm to minimize stack usage.
1456 dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
1458 int64_t parent_space;
1462 mutex_enter(&dd->dd_lock);
1464 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
1466 est_used = dsl_dir_space_towrite(dd) +
1467 dsl_dir_phys(dd)->dd_used_bytes;
1468 parent_space = parent_delta(dd, est_used, space);
1469 mutex_exit(&dd->dd_lock);
1471 /* Make sure that we clean up dd_space_to* */
1472 dsl_dir_dirty(dd, tx);
1475 space = parent_space;
1476 } while (space && dd);
1479 /* call from syncing context when we actually write/free space for this dd */
1481 dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
1482 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
1484 int64_t accounted_delta;
1487 * dsl_dataset_set_refreservation_sync_impl() calls this with
1488 * dd_lock held, so that it can atomically update
1489 * ds->ds_reserved and the dsl_dir accounting, so that
1490 * dsl_dataset_check_quota() can see dataset and dir accounting
1493 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
1495 ASSERT(dmu_tx_is_syncing(tx));
1496 ASSERT(type < DD_USED_NUM);
1498 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1501 mutex_enter(&dd->dd_lock);
1503 parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, used);
1504 ASSERT(used >= 0 || dsl_dir_phys(dd)->dd_used_bytes >= -used);
1505 ASSERT(compressed >= 0 ||
1506 dsl_dir_phys(dd)->dd_compressed_bytes >= -compressed);
1507 ASSERT(uncompressed >= 0 ||
1508 dsl_dir_phys(dd)->dd_uncompressed_bytes >= -uncompressed);
1509 dsl_dir_phys(dd)->dd_used_bytes += used;
1510 dsl_dir_phys(dd)->dd_uncompressed_bytes += uncompressed;
1511 dsl_dir_phys(dd)->dd_compressed_bytes += compressed;
1513 if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
1515 dsl_dir_phys(dd)->dd_used_breakdown[type] >= -used);
1516 dsl_dir_phys(dd)->dd_used_breakdown[type] += used;
1521 for (t = 0; t < DD_USED_NUM; t++)
1522 u += dsl_dir_phys(dd)->dd_used_breakdown[t];
1523 ASSERT3U(u, ==, dsl_dir_phys(dd)->dd_used_bytes);
1528 mutex_exit(&dd->dd_lock);
1530 if (dd->dd_parent != NULL) {
1531 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
1532 accounted_delta, compressed, uncompressed, tx);
1533 dsl_dir_transfer_space(dd->dd_parent,
1534 used - accounted_delta,
1535 DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
1540 dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
1541 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
1543 ASSERT(dmu_tx_is_syncing(tx));
1544 ASSERT(oldtype < DD_USED_NUM);
1545 ASSERT(newtype < DD_USED_NUM);
1548 !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN))
1551 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1552 mutex_enter(&dd->dd_lock);
1554 dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta :
1555 dsl_dir_phys(dd)->dd_used_breakdown[newtype] >= -delta);
1556 ASSERT(dsl_dir_phys(dd)->dd_used_bytes >= ABS(delta));
1557 dsl_dir_phys(dd)->dd_used_breakdown[oldtype] -= delta;
1558 dsl_dir_phys(dd)->dd_used_breakdown[newtype] += delta;
1559 mutex_exit(&dd->dd_lock);
1562 typedef struct dsl_dir_set_qr_arg {
1563 const char *ddsqra_name;
1564 zprop_source_t ddsqra_source;
1565 uint64_t ddsqra_value;
1566 } dsl_dir_set_qr_arg_t;
1569 dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx)
1571 dsl_dir_set_qr_arg_t *ddsqra = arg;
1572 dsl_pool_t *dp = dmu_tx_pool(tx);
1575 uint64_t towrite, newval;
1577 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
1581 error = dsl_prop_predict(ds->ds_dir, "quota",
1582 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
1584 dsl_dataset_rele(ds, FTAG);
1589 dsl_dataset_rele(ds, FTAG);
1593 mutex_enter(&ds->ds_dir->dd_lock);
1595 * If we are doing the preliminary check in open context, and
1596 * there are pending changes, then don't fail it, since the
1597 * pending changes could under-estimate the amount of space to be
1600 towrite = dsl_dir_space_towrite(ds->ds_dir);
1601 if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
1602 (newval < dsl_dir_phys(ds->ds_dir)->dd_reserved ||
1603 newval < dsl_dir_phys(ds->ds_dir)->dd_used_bytes + towrite)) {
1604 error = SET_ERROR(ENOSPC);
1606 mutex_exit(&ds->ds_dir->dd_lock);
1607 dsl_dataset_rele(ds, FTAG);
1612 dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx)
1614 dsl_dir_set_qr_arg_t *ddsqra = arg;
1615 dsl_pool_t *dp = dmu_tx_pool(tx);
1619 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
1621 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
1622 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA),
1623 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
1624 &ddsqra->ddsqra_value, tx);
1626 VERIFY0(dsl_prop_get_int_ds(ds,
1627 zfs_prop_to_name(ZFS_PROP_QUOTA), &newval));
1629 newval = ddsqra->ddsqra_value;
1630 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
1631 zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval);
1634 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
1635 mutex_enter(&ds->ds_dir->dd_lock);
1636 dsl_dir_phys(ds->ds_dir)->dd_quota = newval;
1637 mutex_exit(&ds->ds_dir->dd_lock);
1638 dsl_dataset_rele(ds, FTAG);
1642 dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
1644 dsl_dir_set_qr_arg_t ddsqra;
1646 ddsqra.ddsqra_name = ddname;
1647 ddsqra.ddsqra_source = source;
1648 ddsqra.ddsqra_value = quota;
1650 return (dsl_sync_task(ddname, dsl_dir_set_quota_check,
1651 dsl_dir_set_quota_sync, &ddsqra, 0,
1652 ZFS_SPACE_CHECK_EXTRA_RESERVED));
1656 dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx)
1658 dsl_dir_set_qr_arg_t *ddsqra = arg;
1659 dsl_pool_t *dp = dmu_tx_pool(tx);
1662 uint64_t newval, used, avail;
1665 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
1671 * If we are doing the preliminary check in open context, the
1672 * space estimates may be inaccurate.
1674 if (!dmu_tx_is_syncing(tx)) {
1675 dsl_dataset_rele(ds, FTAG);
1679 error = dsl_prop_predict(ds->ds_dir,
1680 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1681 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
1683 dsl_dataset_rele(ds, FTAG);
1687 mutex_enter(&dd->dd_lock);
1688 used = dsl_dir_phys(dd)->dd_used_bytes;
1689 mutex_exit(&dd->dd_lock);
1691 if (dd->dd_parent) {
1692 avail = dsl_dir_space_available(dd->dd_parent,
1695 avail = dsl_pool_adjustedsize(dd->dd_pool,
1696 ZFS_SPACE_CHECK_NORMAL) - used;
1699 if (MAX(used, newval) > MAX(used, dsl_dir_phys(dd)->dd_reserved)) {
1700 uint64_t delta = MAX(used, newval) -
1701 MAX(used, dsl_dir_phys(dd)->dd_reserved);
1703 if (delta > avail ||
1704 (dsl_dir_phys(dd)->dd_quota > 0 &&
1705 newval > dsl_dir_phys(dd)->dd_quota))
1706 error = SET_ERROR(ENOSPC);
1709 dsl_dataset_rele(ds, FTAG);
1714 dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx)
1719 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1721 mutex_enter(&dd->dd_lock);
1722 used = dsl_dir_phys(dd)->dd_used_bytes;
1723 delta = MAX(used, value) - MAX(used, dsl_dir_phys(dd)->dd_reserved);
1724 dsl_dir_phys(dd)->dd_reserved = value;
1726 if (dd->dd_parent != NULL) {
1727 /* Roll up this additional usage into our ancestors */
1728 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1731 mutex_exit(&dd->dd_lock);
1735 dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx)
1737 dsl_dir_set_qr_arg_t *ddsqra = arg;
1738 dsl_pool_t *dp = dmu_tx_pool(tx);
1742 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
1744 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
1745 dsl_prop_set_sync_impl(ds,
1746 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1747 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
1748 &ddsqra->ddsqra_value, tx);
1750 VERIFY0(dsl_prop_get_int_ds(ds,
1751 zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval));
1753 newval = ddsqra->ddsqra_value;
1754 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
1755 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1756 (longlong_t)newval);
1759 dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx);
1760 dsl_dataset_rele(ds, FTAG);
1764 dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
1765 uint64_t reservation)
1767 dsl_dir_set_qr_arg_t ddsqra;
1769 ddsqra.ddsqra_name = ddname;
1770 ddsqra.ddsqra_source = source;
1771 ddsqra.ddsqra_value = reservation;
1773 return (dsl_sync_task(ddname, dsl_dir_set_reservation_check,
1774 dsl_dir_set_reservation_sync, &ddsqra, 0,
1775 ZFS_SPACE_CHECK_EXTRA_RESERVED));
1779 closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
1781 for (; ds1; ds1 = ds1->dd_parent) {
1783 for (dd = ds2; dd; dd = dd->dd_parent) {
1792 * If delta is applied to dd, how much of that delta would be applied to
1793 * ancestor? Syncing context only.
1796 would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
1801 mutex_enter(&dd->dd_lock);
1802 delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, delta);
1803 mutex_exit(&dd->dd_lock);
1804 return (would_change(dd->dd_parent, delta, ancestor));
1807 typedef struct dsl_dir_rename_arg {
1808 const char *ddra_oldname;
1809 const char *ddra_newname;
1811 } dsl_dir_rename_arg_t;
1813 typedef struct dsl_valid_rename_arg {
1816 } dsl_valid_rename_arg_t;
1820 dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
1822 dsl_valid_rename_arg_t *dvra = arg;
1823 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
1825 dsl_dataset_name(ds, namebuf);
1827 ASSERT3U(strnlen(namebuf, ZFS_MAX_DATASET_NAME_LEN),
1828 <, ZFS_MAX_DATASET_NAME_LEN);
1829 int namelen = strlen(namebuf) + dvra->char_delta;
1830 int depth = get_dataset_depth(namebuf) + dvra->nest_delta;
1832 if (namelen >= ZFS_MAX_DATASET_NAME_LEN)
1833 return (SET_ERROR(ENAMETOOLONG));
1834 if (dvra->nest_delta > 0 && depth >= zfs_max_dataset_nesting)
1835 return (SET_ERROR(ENAMETOOLONG));
1840 dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
1842 dsl_dir_rename_arg_t *ddra = arg;
1843 dsl_pool_t *dp = dmu_tx_pool(tx);
1844 dsl_dir_t *dd, *newparent;
1845 dsl_valid_rename_arg_t dvra;
1846 dsl_dataset_t *parentds;
1848 const char *mynewname;
1851 /* target dir should exist */
1852 error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL);
1856 /* new parent should exist */
1857 error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG,
1858 &newparent, &mynewname);
1860 dsl_dir_rele(dd, FTAG);
1864 /* can't rename to different pool */
1865 if (dd->dd_pool != newparent->dd_pool) {
1866 dsl_dir_rele(newparent, FTAG);
1867 dsl_dir_rele(dd, FTAG);
1868 return (SET_ERROR(EXDEV));
1871 /* new name should not already exist */
1872 if (mynewname == NULL) {
1873 dsl_dir_rele(newparent, FTAG);
1874 dsl_dir_rele(dd, FTAG);
1875 return (SET_ERROR(EEXIST));
1878 /* can't rename below anything but filesystems (eg. no ZVOLs) */
1879 error = dsl_dataset_hold_obj(newparent->dd_pool,
1880 dsl_dir_phys(newparent)->dd_head_dataset_obj, FTAG, &parentds);
1882 dsl_dir_rele(newparent, FTAG);
1883 dsl_dir_rele(dd, FTAG);
1886 error = dmu_objset_from_ds(parentds, &parentos);
1888 dsl_dataset_rele(parentds, FTAG);
1889 dsl_dir_rele(newparent, FTAG);
1890 dsl_dir_rele(dd, FTAG);
1893 if (dmu_objset_type(parentos) != DMU_OST_ZFS) {
1894 dsl_dataset_rele(parentds, FTAG);
1895 dsl_dir_rele(newparent, FTAG);
1896 dsl_dir_rele(dd, FTAG);
1897 return (SET_ERROR(ZFS_ERR_WRONG_PARENT));
1899 dsl_dataset_rele(parentds, FTAG);
1901 ASSERT3U(strnlen(ddra->ddra_newname, ZFS_MAX_DATASET_NAME_LEN),
1902 <, ZFS_MAX_DATASET_NAME_LEN);
1903 ASSERT3U(strnlen(ddra->ddra_oldname, ZFS_MAX_DATASET_NAME_LEN),
1904 <, ZFS_MAX_DATASET_NAME_LEN);
1905 dvra.char_delta = strlen(ddra->ddra_newname)
1906 - strlen(ddra->ddra_oldname);
1907 dvra.nest_delta = get_dataset_depth(ddra->ddra_newname)
1908 - get_dataset_depth(ddra->ddra_oldname);
1910 /* if the name length is growing, validate child name lengths */
1911 if (dvra.char_delta > 0 || dvra.nest_delta > 0) {
1912 error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename,
1913 &dvra, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
1915 dsl_dir_rele(newparent, FTAG);
1916 dsl_dir_rele(dd, FTAG);
1921 if (dmu_tx_is_syncing(tx)) {
1922 if (spa_feature_is_active(dp->dp_spa,
1923 SPA_FEATURE_FS_SS_LIMIT)) {
1925 * Although this is the check function and we don't
1926 * normally make on-disk changes in check functions,
1927 * we need to do that here.
1929 * Ensure this portion of the tree's counts have been
1930 * initialized in case the new parent has limits set.
1932 dsl_dir_init_fs_ss_count(dd, tx);
1936 if (newparent != dd->dd_parent) {
1937 /* is there enough space? */
1939 MAX(dsl_dir_phys(dd)->dd_used_bytes,
1940 dsl_dir_phys(dd)->dd_reserved);
1941 objset_t *os = dd->dd_pool->dp_meta_objset;
1942 uint64_t fs_cnt = 0;
1943 uint64_t ss_cnt = 0;
1945 if (dsl_dir_is_zapified(dd)) {
1948 err = zap_lookup(os, dd->dd_object,
1949 DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
1951 if (err != ENOENT && err != 0) {
1952 dsl_dir_rele(newparent, FTAG);
1953 dsl_dir_rele(dd, FTAG);
1958 * have to add 1 for the filesystem itself that we're
1963 err = zap_lookup(os, dd->dd_object,
1964 DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
1966 if (err != ENOENT && err != 0) {
1967 dsl_dir_rele(newparent, FTAG);
1968 dsl_dir_rele(dd, FTAG);
1973 /* check for encryption errors */
1974 error = dsl_dir_rename_crypt_check(dd, newparent);
1976 dsl_dir_rele(newparent, FTAG);
1977 dsl_dir_rele(dd, FTAG);
1978 return (SET_ERROR(EACCES));
1981 /* no rename into our descendant */
1982 if (closest_common_ancestor(dd, newparent) == dd) {
1983 dsl_dir_rele(newparent, FTAG);
1984 dsl_dir_rele(dd, FTAG);
1985 return (SET_ERROR(EINVAL));
1988 error = dsl_dir_transfer_possible(dd->dd_parent,
1989 newparent, fs_cnt, ss_cnt, myspace, ddra->ddra_cred);
1991 dsl_dir_rele(newparent, FTAG);
1992 dsl_dir_rele(dd, FTAG);
1997 dsl_dir_rele(newparent, FTAG);
1998 dsl_dir_rele(dd, FTAG);
2003 dsl_dir_rename_sync(void *arg, dmu_tx_t *tx)
2005 dsl_dir_rename_arg_t *ddra = arg;
2006 dsl_pool_t *dp = dmu_tx_pool(tx);
2007 dsl_dir_t *dd, *newparent;
2008 const char *mynewname;
2010 objset_t *mos = dp->dp_meta_objset;
2012 VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL));
2013 VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent,
2016 /* Log this before we change the name. */
2017 spa_history_log_internal_dd(dd, "rename", tx,
2018 "-> %s", ddra->ddra_newname);
2020 if (newparent != dd->dd_parent) {
2021 objset_t *os = dd->dd_pool->dp_meta_objset;
2022 uint64_t fs_cnt = 0;
2023 uint64_t ss_cnt = 0;
2026 * We already made sure the dd counts were initialized in the
2029 if (spa_feature_is_active(dp->dp_spa,
2030 SPA_FEATURE_FS_SS_LIMIT)) {
2031 VERIFY0(zap_lookup(os, dd->dd_object,
2032 DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
2034 /* add 1 for the filesystem itself that we're moving */
2037 VERIFY0(zap_lookup(os, dd->dd_object,
2038 DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
2042 dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt,
2043 DD_FIELD_FILESYSTEM_COUNT, tx);
2044 dsl_fs_ss_count_adjust(newparent, fs_cnt,
2045 DD_FIELD_FILESYSTEM_COUNT, tx);
2047 dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt,
2048 DD_FIELD_SNAPSHOT_COUNT, tx);
2049 dsl_fs_ss_count_adjust(newparent, ss_cnt,
2050 DD_FIELD_SNAPSHOT_COUNT, tx);
2052 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
2053 -dsl_dir_phys(dd)->dd_used_bytes,
2054 -dsl_dir_phys(dd)->dd_compressed_bytes,
2055 -dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
2056 dsl_dir_diduse_space(newparent, DD_USED_CHILD,
2057 dsl_dir_phys(dd)->dd_used_bytes,
2058 dsl_dir_phys(dd)->dd_compressed_bytes,
2059 dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
2061 if (dsl_dir_phys(dd)->dd_reserved >
2062 dsl_dir_phys(dd)->dd_used_bytes) {
2063 uint64_t unused_rsrv = dsl_dir_phys(dd)->dd_reserved -
2064 dsl_dir_phys(dd)->dd_used_bytes;
2066 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
2067 -unused_rsrv, 0, 0, tx);
2068 dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV,
2069 unused_rsrv, 0, 0, tx);
2073 dmu_buf_will_dirty(dd->dd_dbuf, tx);
2075 /* remove from old parent zapobj */
2076 error = zap_remove(mos,
2077 dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj,
2081 (void) strlcpy(dd->dd_myname, mynewname,
2082 sizeof (dd->dd_myname));
2083 dsl_dir_rele(dd->dd_parent, dd);
2084 dsl_dir_phys(dd)->dd_parent_obj = newparent->dd_object;
2085 VERIFY0(dsl_dir_hold_obj(dp,
2086 newparent->dd_object, NULL, dd, &dd->dd_parent));
2088 /* add to new parent zapobj */
2089 VERIFY0(zap_add(mos, dsl_dir_phys(newparent)->dd_child_dir_zapobj,
2090 dd->dd_myname, 8, 1, &dd->dd_object, tx));
2092 zvol_rename_minors(dp->dp_spa, ddra->ddra_oldname,
2093 ddra->ddra_newname, B_TRUE);
2095 dsl_prop_notify_all(dd);
2097 dsl_dir_rele(newparent, FTAG);
2098 dsl_dir_rele(dd, FTAG);
2102 dsl_dir_rename(const char *oldname, const char *newname)
2104 dsl_dir_rename_arg_t ddra;
2106 ddra.ddra_oldname = oldname;
2107 ddra.ddra_newname = newname;
2108 ddra.ddra_cred = CRED();
2110 return (dsl_sync_task(oldname,
2111 dsl_dir_rename_check, dsl_dir_rename_sync, &ddra,
2112 3, ZFS_SPACE_CHECK_RESERVED));
2116 dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
2117 uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *cr)
2119 dsl_dir_t *ancestor;
2124 ancestor = closest_common_ancestor(sdd, tdd);
2125 adelta = would_change(sdd, -space, ancestor);
2126 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
2128 return (SET_ERROR(ENOSPC));
2130 err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT,
2134 err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT,
2143 dsl_dir_snap_cmtime(dsl_dir_t *dd)
2147 mutex_enter(&dd->dd_lock);
2148 t = dd->dd_snap_cmtime;
2149 mutex_exit(&dd->dd_lock);
2155 dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
2160 mutex_enter(&dd->dd_lock);
2161 dd->dd_snap_cmtime = t;
2162 mutex_exit(&dd->dd_lock);
2166 dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx)
2168 objset_t *mos = dd->dd_pool->dp_meta_objset;
2169 dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
2173 dsl_dir_is_zapified(dsl_dir_t *dd)
2175 dmu_object_info_t doi;
2177 dmu_object_info_from_db(dd->dd_dbuf, &doi);
2178 return (doi.doi_type == DMU_OTN_ZAP_METADATA);
2181 #if defined(_KERNEL)
2182 EXPORT_SYMBOL(dsl_dir_set_quota);
2183 EXPORT_SYMBOL(dsl_dir_set_reservation);