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, 2014 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.
31 #include <sys/dmu_objset.h>
32 #include <sys/dmu_tx.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_prop.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/dsl_deleg.h>
38 #include <sys/dmu_impl.h>
40 #include <sys/metaslab.h>
44 #include <sys/sunddi.h>
45 #include <sys/zfeature.h>
46 #include <sys/policy.h>
47 #include <sys/zfs_znode.h>
49 #include "zfs_namecheck.h"
53 * Filesystem and Snapshot Limits
54 * ------------------------------
56 * These limits are used to restrict the number of filesystems and/or snapshots
57 * that can be created at a given level in the tree or below. A typical
58 * use-case is with a delegated dataset where the administrator wants to ensure
59 * that a user within the zone is not creating too many additional filesystems
60 * or snapshots, even though they're not exceeding their space quota.
62 * The filesystem and snapshot counts are stored as extensible properties. This
63 * capability is controlled by a feature flag and must be enabled to be used.
64 * Once enabled, the feature is not active until the first limit is set. At
65 * that point, future operations to create/destroy filesystems or snapshots
66 * will validate and update the counts.
68 * Because the count properties will not exist before the feature is active,
69 * the counts are updated when a limit is first set on an uninitialized
70 * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
71 * all of the nested filesystems/snapshots. Thus, a new leaf node has a
72 * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
73 * snapshot count properties on a node indicate uninitialized counts on that
74 * node.) When first setting a limit on an uninitialized node, the code starts
75 * at the filesystem with the new limit and descends into all sub-filesystems
76 * to add the count properties.
78 * In practice this is lightweight since a limit is typically set when the
79 * filesystem is created and thus has no children. Once valid, changing the
80 * limit value won't require a re-traversal since the counts are already valid.
81 * When recursively fixing the counts, if a node with a limit is encountered
82 * during the descent, the counts are known to be valid and there is no need to
83 * descend into that filesystem's children. The counts on filesystems above the
84 * one with the new limit will still be uninitialized, unless a limit is
85 * eventually set on one of those filesystems. The counts are always recursively
86 * updated when a limit is set on a dataset, unless there is already a limit.
87 * When a new limit value is set on a filesystem with an existing limit, it is
88 * possible for the new limit to be less than the current count at that level
89 * since a user who can change the limit is also allowed to exceed the limit.
91 * Once the feature is active, then whenever a filesystem or snapshot is
92 * created, the code recurses up the tree, validating the new count against the
93 * limit at each initialized level. In practice, most levels will not have a
94 * limit set. If there is a limit at any initialized level up the tree, the
95 * check must pass or the creation will fail. Likewise, when a filesystem or
96 * snapshot is destroyed, the counts are recursively adjusted all the way up
97 * the initizized nodes in the tree. Renaming a filesystem into different point
98 * in the tree will first validate, then update the counts on each branch up to
99 * the common ancestor. A receive will also validate the counts and then update
102 * An exception to the above behavior is that the limit is not enforced if the
103 * user has permission to modify the limit. This is primarily so that
104 * recursive snapshots in the global zone always work. We want to prevent a
105 * denial-of-service in which a lower level delegated dataset could max out its
106 * limit and thus block recursive snapshots from being taken in the global zone.
107 * Because of this, it is possible for the snapshot count to be over the limit
108 * and snapshots taken in the global zone could cause a lower level dataset to
109 * hit or exceed its limit. The administrator taking the global zone recursive
110 * snapshot should be aware of this side-effect and behave accordingly.
111 * For consistency, the filesystem limit is also not enforced if the user can
114 * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
115 * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
116 * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
117 * dsl_dir_init_fs_ss_count().
119 * There is a special case when we receive a filesystem that already exists. In
120 * this case a temporary clone name of %X is created (see dmu_recv_begin). We
121 * never update the filesystem counts for temporary clones.
123 * Likewise, we do not update the snapshot counts for temporary snapshots,
124 * such as those created by zfs diff.
127 extern inline dsl_dir_phys_t
*dsl_dir_phys(dsl_dir_t
*dd
);
129 static uint64_t dsl_dir_space_towrite(dsl_dir_t
*dd
);
132 dsl_dir_evict(void *dbu
)
136 ASSERTV(dsl_pool_t
*dp
= dd
->dd_pool
);
140 for (t
= 0; t
< TXG_SIZE
; t
++) {
141 ASSERT(!txg_list_member(&dp
->dp_dirty_dirs
, dd
, t
));
142 ASSERT(dd
->dd_tempreserved
[t
] == 0);
143 ASSERT(dd
->dd_space_towrite
[t
] == 0);
147 dsl_dir_async_rele(dd
->dd_parent
, dd
);
149 spa_async_close(dd
->dd_pool
->dp_spa
, dd
);
152 mutex_destroy(&dd
->dd_lock
);
153 kmem_free(dd
, sizeof (dsl_dir_t
));
157 dsl_dir_hold_obj(dsl_pool_t
*dp
, uint64_t ddobj
,
158 const char *tail
, void *tag
, dsl_dir_t
**ddp
)
164 ASSERT(dsl_pool_config_held(dp
));
166 err
= dmu_bonus_hold(dp
->dp_meta_objset
, ddobj
, tag
, &dbuf
);
169 dd
= dmu_buf_get_user(dbuf
);
172 dmu_object_info_t doi
;
173 dmu_object_info_from_db(dbuf
, &doi
);
174 ASSERT3U(doi
.doi_bonus_type
, ==, DMU_OT_DSL_DIR
);
175 ASSERT3U(doi
.doi_bonus_size
, >=, sizeof (dsl_dir_phys_t
));
181 dd
= kmem_zalloc(sizeof (dsl_dir_t
), KM_SLEEP
);
182 dd
->dd_object
= ddobj
;
185 mutex_init(&dd
->dd_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
188 dsl_dir_snap_cmtime_update(dd
);
190 if (dsl_dir_phys(dd
)->dd_parent_obj
) {
191 err
= dsl_dir_hold_obj(dp
,
192 dsl_dir_phys(dd
)->dd_parent_obj
, NULL
, dd
,
200 err
= zap_lookup(dp
->dp_meta_objset
,
201 dsl_dir_phys(dd
->dd_parent
)->
202 dd_child_dir_zapobj
, tail
,
203 sizeof (foundobj
), 1, &foundobj
);
204 ASSERT(err
|| foundobj
== ddobj
);
206 (void) strlcpy(dd
->dd_myname
, tail
,
207 sizeof (dd
->dd_myname
));
209 err
= zap_value_search(dp
->dp_meta_objset
,
210 dsl_dir_phys(dd
->dd_parent
)->
212 ddobj
, 0, dd
->dd_myname
);
217 (void) strcpy(dd
->dd_myname
, spa_name(dp
->dp_spa
));
220 if (dsl_dir_is_clone(dd
)) {
221 dmu_buf_t
*origin_bonus
;
222 dsl_dataset_phys_t
*origin_phys
;
225 * We can't open the origin dataset, because
226 * that would require opening this dsl_dir.
227 * Just look at its phys directly instead.
229 err
= dmu_bonus_hold(dp
->dp_meta_objset
,
230 dsl_dir_phys(dd
)->dd_origin_obj
, FTAG
,
234 origin_phys
= origin_bonus
->db_data
;
236 origin_phys
->ds_creation_txg
;
237 dmu_buf_rele(origin_bonus
, FTAG
);
240 dmu_buf_init_user(&dd
->dd_dbu
, dsl_dir_evict
, &dd
->dd_dbuf
);
241 winner
= dmu_buf_set_user_ie(dbuf
, &dd
->dd_dbu
);
242 if (winner
!= NULL
) {
244 dsl_dir_rele(dd
->dd_parent
, dd
);
246 mutex_destroy(&dd
->dd_lock
);
247 kmem_free(dd
, sizeof (dsl_dir_t
));
250 spa_open_ref(dp
->dp_spa
, dd
);
255 * The dsl_dir_t has both open-to-close and instantiate-to-evict
256 * holds on the spa. We need the open-to-close holds because
257 * otherwise the spa_refcnt wouldn't change when we open a
258 * dir which the spa also has open, so we could incorrectly
259 * think it was OK to unload/export/destroy the pool. We need
260 * the instantiate-to-evict hold because the dsl_dir_t has a
261 * pointer to the dd_pool, which has a pointer to the spa_t.
263 spa_open_ref(dp
->dp_spa
, tag
);
264 ASSERT3P(dd
->dd_pool
, ==, dp
);
265 ASSERT3U(dd
->dd_object
, ==, ddobj
);
266 ASSERT3P(dd
->dd_dbuf
, ==, dbuf
);
272 dsl_dir_rele(dd
->dd_parent
, dd
);
274 mutex_destroy(&dd
->dd_lock
);
275 kmem_free(dd
, sizeof (dsl_dir_t
));
276 dmu_buf_rele(dbuf
, tag
);
281 dsl_dir_rele(dsl_dir_t
*dd
, void *tag
)
283 dprintf_dd(dd
, "%s\n", "");
284 spa_close(dd
->dd_pool
->dp_spa
, tag
);
285 dmu_buf_rele(dd
->dd_dbuf
, tag
);
289 * Remove a reference to the given dsl dir that is being asynchronously
290 * released. Async releases occur from a taskq performing eviction of
291 * dsl datasets and dirs. This process is identical to a normal release
292 * with the exception of using the async API for releasing the reference on
296 dsl_dir_async_rele(dsl_dir_t
*dd
, void *tag
)
298 dprintf_dd(dd
, "%s\n", "");
299 spa_async_close(dd
->dd_pool
->dp_spa
, tag
);
300 dmu_buf_rele(dd
->dd_dbuf
, tag
);
303 /* buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes */
305 dsl_dir_name(dsl_dir_t
*dd
, char *buf
)
308 dsl_dir_name(dd
->dd_parent
, buf
);
309 VERIFY3U(strlcat(buf
, "/", ZFS_MAX_DATASET_NAME_LEN
), <,
310 ZFS_MAX_DATASET_NAME_LEN
);
314 if (!MUTEX_HELD(&dd
->dd_lock
)) {
316 * recursive mutex so that we can use
317 * dprintf_dd() with dd_lock held
319 mutex_enter(&dd
->dd_lock
);
320 VERIFY3U(strlcat(buf
, dd
->dd_myname
, ZFS_MAX_DATASET_NAME_LEN
),
321 <, ZFS_MAX_DATASET_NAME_LEN
);
322 mutex_exit(&dd
->dd_lock
);
324 VERIFY3U(strlcat(buf
, dd
->dd_myname
, ZFS_MAX_DATASET_NAME_LEN
),
325 <, ZFS_MAX_DATASET_NAME_LEN
);
329 /* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
331 dsl_dir_namelen(dsl_dir_t
*dd
)
336 /* parent's name + 1 for the "/" */
337 result
= dsl_dir_namelen(dd
->dd_parent
) + 1;
340 if (!MUTEX_HELD(&dd
->dd_lock
)) {
341 /* see dsl_dir_name */
342 mutex_enter(&dd
->dd_lock
);
343 result
+= strlen(dd
->dd_myname
);
344 mutex_exit(&dd
->dd_lock
);
346 result
+= strlen(dd
->dd_myname
);
353 getcomponent(const char *path
, char *component
, const char **nextp
)
357 if ((path
== NULL
) || (path
[0] == '\0'))
358 return (SET_ERROR(ENOENT
));
359 /* This would be a good place to reserve some namespace... */
360 p
= strpbrk(path
, "/@");
361 if (p
&& (p
[1] == '/' || p
[1] == '@')) {
362 /* two separators in a row */
363 return (SET_ERROR(EINVAL
));
365 if (p
== NULL
|| p
== path
) {
367 * if the first thing is an @ or /, it had better be an
368 * @ and it had better not have any more ats or slashes,
369 * and it had better have something after the @.
372 (p
[0] != '@' || strpbrk(path
+1, "/@") || p
[1] == '\0'))
373 return (SET_ERROR(EINVAL
));
374 if (strlen(path
) >= ZFS_MAX_DATASET_NAME_LEN
)
375 return (SET_ERROR(ENAMETOOLONG
));
376 (void) strcpy(component
, path
);
378 } else if (p
[0] == '/') {
379 if (p
- path
>= ZFS_MAX_DATASET_NAME_LEN
)
380 return (SET_ERROR(ENAMETOOLONG
));
381 (void) strncpy(component
, path
, p
- path
);
382 component
[p
- path
] = '\0';
384 } else if (p
[0] == '@') {
386 * if the next separator is an @, there better not be
389 if (strchr(path
, '/'))
390 return (SET_ERROR(EINVAL
));
391 if (p
- path
>= ZFS_MAX_DATASET_NAME_LEN
)
392 return (SET_ERROR(ENAMETOOLONG
));
393 (void) strncpy(component
, path
, p
- path
);
394 component
[p
- path
] = '\0';
396 panic("invalid p=%p", (void *)p
);
403 * Return the dsl_dir_t, and possibly the last component which couldn't
404 * be found in *tail. The name must be in the specified dsl_pool_t. This
405 * thread must hold the dp_config_rwlock for the pool. Returns NULL if the
406 * path is bogus, or if tail==NULL and we couldn't parse the whole name.
407 * (*tail)[0] == '@' means that the last component is a snapshot.
410 dsl_dir_hold(dsl_pool_t
*dp
, const char *name
, void *tag
,
411 dsl_dir_t
**ddp
, const char **tailp
)
414 const char *spaname
, *next
, *nextnext
= NULL
;
419 buf
= kmem_alloc(ZFS_MAX_DATASET_NAME_LEN
, KM_SLEEP
);
420 err
= getcomponent(name
, buf
, &next
);
424 /* Make sure the name is in the specified pool. */
425 spaname
= spa_name(dp
->dp_spa
);
426 if (strcmp(buf
, spaname
) != 0) {
427 err
= SET_ERROR(EXDEV
);
431 ASSERT(dsl_pool_config_held(dp
));
433 err
= dsl_dir_hold_obj(dp
, dp
->dp_root_dir_obj
, NULL
, tag
, &dd
);
438 while (next
!= NULL
) {
440 err
= getcomponent(next
, buf
, &nextnext
);
443 ASSERT(next
[0] != '\0');
446 dprintf("looking up %s in obj%lld\n",
447 buf
, dsl_dir_phys(dd
)->dd_child_dir_zapobj
);
449 err
= zap_lookup(dp
->dp_meta_objset
,
450 dsl_dir_phys(dd
)->dd_child_dir_zapobj
,
451 buf
, sizeof (ddobj
), 1, &ddobj
);
458 err
= dsl_dir_hold_obj(dp
, ddobj
, buf
, tag
, &child_dd
);
461 dsl_dir_rele(dd
, tag
);
467 dsl_dir_rele(dd
, tag
);
472 * It's an error if there's more than one component left, or
473 * tailp==NULL and there's any component left.
476 (tailp
== NULL
|| (nextnext
&& nextnext
[0] != '\0'))) {
478 dsl_dir_rele(dd
, tag
);
479 dprintf("next=%p (%s) tail=%p\n", next
, next
?next
:"", tailp
);
480 err
= SET_ERROR(ENOENT
);
486 kmem_free(buf
, ZFS_MAX_DATASET_NAME_LEN
);
491 * If the counts are already initialized for this filesystem and its
492 * descendants then do nothing, otherwise initialize the counts.
494 * The counts on this filesystem, and those below, may be uninitialized due to
495 * either the use of a pre-existing pool which did not support the
496 * filesystem/snapshot limit feature, or one in which the feature had not yet
499 * Recursively descend the filesystem tree and update the filesystem/snapshot
500 * counts on each filesystem below, then update the cumulative count on the
501 * current filesystem. If the filesystem already has a count set on it,
502 * then we know that its counts, and the counts on the filesystems below it,
503 * are already correct, so we don't have to update this filesystem.
506 dsl_dir_init_fs_ss_count(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
508 uint64_t my_fs_cnt
= 0;
509 uint64_t my_ss_cnt
= 0;
510 dsl_pool_t
*dp
= dd
->dd_pool
;
511 objset_t
*os
= dp
->dp_meta_objset
;
516 ASSERT(spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
));
517 ASSERT(dsl_pool_config_held(dp
));
518 ASSERT(dmu_tx_is_syncing(tx
));
520 dsl_dir_zapify(dd
, tx
);
523 * If the filesystem count has already been initialized then we
524 * don't need to recurse down any further.
526 if (zap_contains(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
) == 0)
529 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_SLEEP
);
530 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
532 /* Iterate my child dirs */
533 for (zap_cursor_init(zc
, os
, dsl_dir_phys(dd
)->dd_child_dir_zapobj
);
534 zap_cursor_retrieve(zc
, za
) == 0; zap_cursor_advance(zc
)) {
538 VERIFY0(dsl_dir_hold_obj(dp
, za
->za_first_integer
, NULL
, FTAG
,
542 * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and
543 * temporary datasets.
545 if (chld_dd
->dd_myname
[0] == '$' ||
546 chld_dd
->dd_myname
[0] == '%') {
547 dsl_dir_rele(chld_dd
, FTAG
);
551 my_fs_cnt
++; /* count this child */
553 dsl_dir_init_fs_ss_count(chld_dd
, tx
);
555 VERIFY0(zap_lookup(os
, chld_dd
->dd_object
,
556 DD_FIELD_FILESYSTEM_COUNT
, sizeof (count
), 1, &count
));
558 VERIFY0(zap_lookup(os
, chld_dd
->dd_object
,
559 DD_FIELD_SNAPSHOT_COUNT
, sizeof (count
), 1, &count
));
562 dsl_dir_rele(chld_dd
, FTAG
);
565 /* Count my snapshots (we counted children's snapshots above) */
566 VERIFY0(dsl_dataset_hold_obj(dd
->dd_pool
,
567 dsl_dir_phys(dd
)->dd_head_dataset_obj
, FTAG
, &ds
));
569 for (zap_cursor_init(zc
, os
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
);
570 zap_cursor_retrieve(zc
, za
) == 0;
571 zap_cursor_advance(zc
)) {
572 /* Don't count temporary snapshots */
573 if (za
->za_name
[0] != '%')
578 dsl_dataset_rele(ds
, FTAG
);
580 kmem_free(zc
, sizeof (zap_cursor_t
));
581 kmem_free(za
, sizeof (zap_attribute_t
));
583 /* we're in a sync task, update counts */
584 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
585 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
586 sizeof (my_fs_cnt
), 1, &my_fs_cnt
, tx
));
587 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
588 sizeof (my_ss_cnt
), 1, &my_ss_cnt
, tx
));
592 dsl_dir_actv_fs_ss_limit_check(void *arg
, dmu_tx_t
*tx
)
594 char *ddname
= (char *)arg
;
595 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
600 error
= dsl_dataset_hold(dp
, ddname
, FTAG
, &ds
);
604 if (!spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
605 dsl_dataset_rele(ds
, FTAG
);
606 return (SET_ERROR(ENOTSUP
));
610 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
) &&
611 dsl_dir_is_zapified(dd
) &&
612 zap_contains(dp
->dp_meta_objset
, dd
->dd_object
,
613 DD_FIELD_FILESYSTEM_COUNT
) == 0) {
614 dsl_dataset_rele(ds
, FTAG
);
615 return (SET_ERROR(EALREADY
));
618 dsl_dataset_rele(ds
, FTAG
);
623 dsl_dir_actv_fs_ss_limit_sync(void *arg
, dmu_tx_t
*tx
)
625 char *ddname
= (char *)arg
;
626 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
630 VERIFY0(dsl_dataset_hold(dp
, ddname
, FTAG
, &ds
));
632 spa
= dsl_dataset_get_spa(ds
);
634 if (!spa_feature_is_active(spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
636 * Since the feature was not active and we're now setting a
637 * limit, increment the feature-active counter so that the
638 * feature becomes active for the first time.
640 * We are already in a sync task so we can update the MOS.
642 spa_feature_incr(spa
, SPA_FEATURE_FS_SS_LIMIT
, tx
);
646 * Since we are now setting a non-UINT64_MAX limit on the filesystem,
647 * we need to ensure the counts are correct. Descend down the tree from
648 * this point and update all of the counts to be accurate.
650 dsl_dir_init_fs_ss_count(ds
->ds_dir
, tx
);
652 dsl_dataset_rele(ds
, FTAG
);
656 * Make sure the feature is enabled and activate it if necessary.
657 * Since we're setting a limit, ensure the on-disk counts are valid.
658 * This is only called by the ioctl path when setting a limit value.
660 * We do not need to validate the new limit, since users who can change the
661 * limit are also allowed to exceed the limit.
664 dsl_dir_activate_fs_ss_limit(const char *ddname
)
668 error
= dsl_sync_task(ddname
, dsl_dir_actv_fs_ss_limit_check
,
669 dsl_dir_actv_fs_ss_limit_sync
, (void *)ddname
, 0,
670 ZFS_SPACE_CHECK_RESERVED
);
672 if (error
== EALREADY
)
679 * Used to determine if the filesystem_limit or snapshot_limit should be
680 * enforced. We allow the limit to be exceeded if the user has permission to
681 * write the property value. We pass in the creds that we got in the open
682 * context since we will always be the GZ root in syncing context. We also have
683 * to handle the case where we are allowed to change the limit on the current
684 * dataset, but there may be another limit in the tree above.
686 * We can never modify these two properties within a non-global zone. In
687 * addition, the other checks are modeled on zfs_secpolicy_write_perms. We
688 * can't use that function since we are already holding the dp_config_rwlock.
689 * In addition, we already have the dd and dealing with snapshots is simplified
700 dsl_enforce_ds_ss_limits(dsl_dir_t
*dd
, zfs_prop_t prop
, cred_t
*cr
)
702 enforce_res_t enforce
= ENFORCE_ALWAYS
;
707 ASSERT(prop
== ZFS_PROP_FILESYSTEM_LIMIT
||
708 prop
== ZFS_PROP_SNAPSHOT_LIMIT
);
711 if (crgetzoneid(cr
) != GLOBAL_ZONEID
)
712 return (ENFORCE_ALWAYS
);
714 if (secpolicy_zfs(cr
) == 0)
715 return (ENFORCE_NEVER
);
718 if ((obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
) == 0)
719 return (ENFORCE_ALWAYS
);
721 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
723 if (dsl_dataset_hold_obj(dd
->dd_pool
, obj
, FTAG
, &ds
) != 0)
724 return (ENFORCE_ALWAYS
);
726 if (dsl_prop_get_ds(ds
, "zoned", 8, 1, &zoned
, NULL
) || zoned
) {
727 /* Only root can access zoned fs's from the GZ */
728 enforce
= ENFORCE_ALWAYS
;
730 if (dsl_deleg_access_impl(ds
, zfs_prop_to_name(prop
), cr
) == 0)
731 enforce
= ENFORCE_ABOVE
;
734 dsl_dataset_rele(ds
, FTAG
);
739 * Check if adding additional child filesystem(s) would exceed any filesystem
740 * limits or adding additional snapshot(s) would exceed any snapshot limits.
741 * The prop argument indicates which limit to check.
743 * Note that all filesystem limits up to the root (or the highest
744 * initialized) filesystem or the given ancestor must be satisfied.
747 dsl_fs_ss_limit_check(dsl_dir_t
*dd
, uint64_t delta
, zfs_prop_t prop
,
748 dsl_dir_t
*ancestor
, cred_t
*cr
)
750 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
751 uint64_t limit
, count
;
753 enforce_res_t enforce
;
756 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
757 ASSERT(prop
== ZFS_PROP_FILESYSTEM_LIMIT
||
758 prop
== ZFS_PROP_SNAPSHOT_LIMIT
);
761 * If we're allowed to change the limit, don't enforce the limit
762 * e.g. this can happen if a snapshot is taken by an administrative
763 * user in the global zone (i.e. a recursive snapshot by root).
764 * However, we must handle the case of delegated permissions where we
765 * are allowed to change the limit on the current dataset, but there
766 * is another limit in the tree above.
768 enforce
= dsl_enforce_ds_ss_limits(dd
, prop
, cr
);
769 if (enforce
== ENFORCE_NEVER
)
773 * e.g. if renaming a dataset with no snapshots, count adjustment
779 if (prop
== ZFS_PROP_SNAPSHOT_LIMIT
) {
781 * We don't enforce the limit for temporary snapshots. This is
782 * indicated by a NULL cred_t argument.
787 count_prop
= DD_FIELD_SNAPSHOT_COUNT
;
789 count_prop
= DD_FIELD_FILESYSTEM_COUNT
;
793 * If an ancestor has been provided, stop checking the limit once we
794 * hit that dir. We need this during rename so that we don't overcount
795 * the check once we recurse up to the common ancestor.
801 * If we hit an uninitialized node while recursing up the tree, we can
802 * stop since we know there is no limit here (or above). The counts are
803 * not valid on this node and we know we won't touch this node's counts.
805 if (!dsl_dir_is_zapified(dd
) || zap_lookup(os
, dd
->dd_object
,
806 count_prop
, sizeof (count
), 1, &count
) == ENOENT
)
809 err
= dsl_prop_get_dd(dd
, zfs_prop_to_name(prop
), 8, 1, &limit
, NULL
,
814 /* Is there a limit which we've hit? */
815 if (enforce
== ENFORCE_ALWAYS
&& (count
+ delta
) > limit
)
816 return (SET_ERROR(EDQUOT
));
818 if (dd
->dd_parent
!= NULL
)
819 err
= dsl_fs_ss_limit_check(dd
->dd_parent
, delta
, prop
,
826 * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
827 * parents. When a new filesystem/snapshot is created, increment the count on
828 * all parents, and when a filesystem/snapshot is destroyed, decrement the
832 dsl_fs_ss_count_adjust(dsl_dir_t
*dd
, int64_t delta
, const char *prop
,
836 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
839 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
840 ASSERT(dmu_tx_is_syncing(tx
));
841 ASSERT(strcmp(prop
, DD_FIELD_FILESYSTEM_COUNT
) == 0 ||
842 strcmp(prop
, DD_FIELD_SNAPSHOT_COUNT
) == 0);
845 * When we receive an incremental stream into a filesystem that already
846 * exists, a temporary clone is created. We don't count this temporary
847 * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
848 * $MOS & $ORIGIN) objsets.
850 if ((dd
->dd_myname
[0] == '%' || dd
->dd_myname
[0] == '$') &&
851 strcmp(prop
, DD_FIELD_FILESYSTEM_COUNT
) == 0)
855 * e.g. if renaming a dataset with no snapshots, count adjustment is 0
861 * If we hit an uninitialized node while recursing up the tree, we can
862 * stop since we know the counts are not valid on this node and we
863 * know we shouldn't touch this node's counts. An uninitialized count
864 * on the node indicates that either the feature has not yet been
865 * activated or there are no limits on this part of the tree.
867 if (!dsl_dir_is_zapified(dd
) || (err
= zap_lookup(os
, dd
->dd_object
,
868 prop
, sizeof (count
), 1, &count
)) == ENOENT
)
873 /* Use a signed verify to make sure we're not neg. */
874 VERIFY3S(count
, >=, 0);
876 VERIFY0(zap_update(os
, dd
->dd_object
, prop
, sizeof (count
), 1, &count
,
879 /* Roll up this additional count into our ancestors */
880 if (dd
->dd_parent
!= NULL
)
881 dsl_fs_ss_count_adjust(dd
->dd_parent
, delta
, prop
, tx
);
885 dsl_dir_create_sync(dsl_pool_t
*dp
, dsl_dir_t
*pds
, const char *name
,
888 objset_t
*mos
= dp
->dp_meta_objset
;
890 dsl_dir_phys_t
*ddphys
;
893 ddobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DIR
, 0,
894 DMU_OT_DSL_DIR
, sizeof (dsl_dir_phys_t
), tx
);
896 VERIFY(0 == zap_add(mos
, dsl_dir_phys(pds
)->dd_child_dir_zapobj
,
897 name
, sizeof (uint64_t), 1, &ddobj
, tx
));
899 /* it's the root dir */
900 VERIFY(0 == zap_add(mos
, DMU_POOL_DIRECTORY_OBJECT
,
901 DMU_POOL_ROOT_DATASET
, sizeof (uint64_t), 1, &ddobj
, tx
));
903 VERIFY(0 == dmu_bonus_hold(mos
, ddobj
, FTAG
, &dbuf
));
904 dmu_buf_will_dirty(dbuf
, tx
);
905 ddphys
= dbuf
->db_data
;
907 ddphys
->dd_creation_time
= gethrestime_sec();
909 ddphys
->dd_parent_obj
= pds
->dd_object
;
911 /* update the filesystem counts */
912 dsl_fs_ss_count_adjust(pds
, 1, DD_FIELD_FILESYSTEM_COUNT
, tx
);
914 ddphys
->dd_props_zapobj
= zap_create(mos
,
915 DMU_OT_DSL_PROPS
, DMU_OT_NONE
, 0, tx
);
916 ddphys
->dd_child_dir_zapobj
= zap_create(mos
,
917 DMU_OT_DSL_DIR_CHILD_MAP
, DMU_OT_NONE
, 0, tx
);
918 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_USED_BREAKDOWN
)
919 ddphys
->dd_flags
|= DD_FLAG_USED_BREAKDOWN
;
920 dmu_buf_rele(dbuf
, FTAG
);
926 dsl_dir_is_clone(dsl_dir_t
*dd
)
928 return (dsl_dir_phys(dd
)->dd_origin_obj
&&
929 (dd
->dd_pool
->dp_origin_snap
== NULL
||
930 dsl_dir_phys(dd
)->dd_origin_obj
!=
931 dd
->dd_pool
->dp_origin_snap
->ds_object
));
935 dsl_dir_stats(dsl_dir_t
*dd
, nvlist_t
*nv
)
937 mutex_enter(&dd
->dd_lock
);
938 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USED
,
939 dsl_dir_phys(dd
)->dd_used_bytes
);
940 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_QUOTA
,
941 dsl_dir_phys(dd
)->dd_quota
);
942 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_RESERVATION
,
943 dsl_dir_phys(dd
)->dd_reserved
);
944 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_COMPRESSRATIO
,
945 dsl_dir_phys(dd
)->dd_compressed_bytes
== 0 ? 100 :
946 (dsl_dir_phys(dd
)->dd_uncompressed_bytes
* 100 /
947 dsl_dir_phys(dd
)->dd_compressed_bytes
));
948 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALUSED
,
949 dsl_dir_phys(dd
)->dd_uncompressed_bytes
);
950 if (dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
951 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDSNAP
,
952 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_SNAP
]);
953 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDDS
,
954 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_HEAD
]);
955 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDREFRESERV
,
956 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_REFRSRV
]);
957 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDCHILD
,
958 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_CHILD
] +
959 dsl_dir_phys(dd
)->dd_used_breakdown
[DD_USED_CHILD_RSRV
]);
961 mutex_exit(&dd
->dd_lock
);
963 if (dsl_dir_is_zapified(dd
)) {
965 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
967 if (zap_lookup(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
968 sizeof (count
), 1, &count
) == 0) {
969 dsl_prop_nvlist_add_uint64(nv
,
970 ZFS_PROP_FILESYSTEM_COUNT
, count
);
972 if (zap_lookup(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
973 sizeof (count
), 1, &count
) == 0) {
974 dsl_prop_nvlist_add_uint64(nv
,
975 ZFS_PROP_SNAPSHOT_COUNT
, count
);
979 if (dsl_dir_is_clone(dd
)) {
981 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
983 VERIFY0(dsl_dataset_hold_obj(dd
->dd_pool
,
984 dsl_dir_phys(dd
)->dd_origin_obj
, FTAG
, &ds
));
985 dsl_dataset_name(ds
, buf
);
986 dsl_dataset_rele(ds
, FTAG
);
987 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_ORIGIN
, buf
);
992 dsl_dir_dirty(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
994 dsl_pool_t
*dp
= dd
->dd_pool
;
996 ASSERT(dsl_dir_phys(dd
));
998 if (txg_list_add(&dp
->dp_dirty_dirs
, dd
, tx
->tx_txg
)) {
999 /* up the hold count until we can be written out */
1000 dmu_buf_add_ref(dd
->dd_dbuf
, dd
);
1005 parent_delta(dsl_dir_t
*dd
, uint64_t used
, int64_t delta
)
1007 uint64_t old_accounted
= MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1008 uint64_t new_accounted
=
1009 MAX(used
+ delta
, dsl_dir_phys(dd
)->dd_reserved
);
1010 return (new_accounted
- old_accounted
);
1014 dsl_dir_sync(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
1016 ASSERT(dmu_tx_is_syncing(tx
));
1018 mutex_enter(&dd
->dd_lock
);
1019 ASSERT0(dd
->dd_tempreserved
[tx
->tx_txg
&TXG_MASK
]);
1020 dprintf_dd(dd
, "txg=%llu towrite=%lluK\n", tx
->tx_txg
,
1021 dd
->dd_space_towrite
[tx
->tx_txg
&TXG_MASK
] / 1024);
1022 dd
->dd_space_towrite
[tx
->tx_txg
&TXG_MASK
] = 0;
1023 mutex_exit(&dd
->dd_lock
);
1025 /* release the hold from dsl_dir_dirty */
1026 dmu_buf_rele(dd
->dd_dbuf
, dd
);
1030 dsl_dir_space_towrite(dsl_dir_t
*dd
)
1035 ASSERT(MUTEX_HELD(&dd
->dd_lock
));
1037 for (i
= 0; i
< TXG_SIZE
; i
++) {
1038 space
+= dd
->dd_space_towrite
[i
&TXG_MASK
];
1039 ASSERT3U(dd
->dd_space_towrite
[i
&TXG_MASK
], >=, 0);
1045 * How much space would dd have available if ancestor had delta applied
1046 * to it? If ondiskonly is set, we're only interested in what's
1047 * on-disk, not estimated pending changes.
1050 dsl_dir_space_available(dsl_dir_t
*dd
,
1051 dsl_dir_t
*ancestor
, int64_t delta
, int ondiskonly
)
1053 uint64_t parentspace
, myspace
, quota
, used
;
1056 * If there are no restrictions otherwise, assume we have
1057 * unlimited space available.
1060 parentspace
= UINT64_MAX
;
1062 if (dd
->dd_parent
!= NULL
) {
1063 parentspace
= dsl_dir_space_available(dd
->dd_parent
,
1064 ancestor
, delta
, ondiskonly
);
1067 mutex_enter(&dd
->dd_lock
);
1068 if (dsl_dir_phys(dd
)->dd_quota
!= 0)
1069 quota
= dsl_dir_phys(dd
)->dd_quota
;
1070 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1072 used
+= dsl_dir_space_towrite(dd
);
1074 if (dd
->dd_parent
== NULL
) {
1075 uint64_t poolsize
= dsl_pool_adjustedsize(dd
->dd_pool
, FALSE
);
1076 quota
= MIN(quota
, poolsize
);
1079 if (dsl_dir_phys(dd
)->dd_reserved
> used
&& parentspace
!= UINT64_MAX
) {
1081 * We have some space reserved, in addition to what our
1084 parentspace
+= dsl_dir_phys(dd
)->dd_reserved
- used
;
1087 if (dd
== ancestor
) {
1089 ASSERT(used
>= -delta
);
1091 if (parentspace
!= UINT64_MAX
)
1092 parentspace
-= delta
;
1100 * the lesser of the space provided by our parent and
1101 * the space left in our quota
1103 myspace
= MIN(parentspace
, quota
- used
);
1106 mutex_exit(&dd
->dd_lock
);
1111 struct tempreserve
{
1112 list_node_t tr_node
;
1118 dsl_dir_tempreserve_impl(dsl_dir_t
*dd
, uint64_t asize
, boolean_t netfree
,
1119 boolean_t ignorequota
, boolean_t checkrefquota
, list_t
*tr_list
,
1120 dmu_tx_t
*tx
, boolean_t first
)
1122 uint64_t txg
= tx
->tx_txg
;
1123 uint64_t est_inflight
, used_on_disk
, quota
, parent_rsrv
;
1124 uint64_t deferred
= 0;
1125 struct tempreserve
*tr
;
1126 int retval
= EDQUOT
;
1127 int txgidx
= txg
& TXG_MASK
;
1129 uint64_t ref_rsrv
= 0;
1131 ASSERT3U(txg
, !=, 0);
1132 ASSERT3S(asize
, >, 0);
1134 mutex_enter(&dd
->dd_lock
);
1137 * Check against the dsl_dir's quota. We don't add in the delta
1138 * when checking for over-quota because they get one free hit.
1140 est_inflight
= dsl_dir_space_towrite(dd
);
1141 for (i
= 0; i
< TXG_SIZE
; i
++)
1142 est_inflight
+= dd
->dd_tempreserved
[i
];
1143 used_on_disk
= dsl_dir_phys(dd
)->dd_used_bytes
;
1146 * On the first iteration, fetch the dataset's used-on-disk and
1147 * refreservation values. Also, if checkrefquota is set, test if
1148 * allocating this space would exceed the dataset's refquota.
1150 if (first
&& tx
->tx_objset
) {
1152 dsl_dataset_t
*ds
= tx
->tx_objset
->os_dsl_dataset
;
1154 error
= dsl_dataset_check_quota(ds
, checkrefquota
,
1155 asize
, est_inflight
, &used_on_disk
, &ref_rsrv
);
1157 mutex_exit(&dd
->dd_lock
);
1158 DMU_TX_STAT_BUMP(dmu_tx_quota
);
1164 * If this transaction will result in a net free of space,
1165 * we want to let it through.
1167 if (ignorequota
|| netfree
|| dsl_dir_phys(dd
)->dd_quota
== 0)
1170 quota
= dsl_dir_phys(dd
)->dd_quota
;
1173 * Adjust the quota against the actual pool size at the root
1174 * minus any outstanding deferred frees.
1175 * To ensure that it's possible to remove files from a full
1176 * pool without inducing transient overcommits, we throttle
1177 * netfree transactions against a quota that is slightly larger,
1178 * but still within the pool's allocation slop. In cases where
1179 * we're very close to full, this will allow a steady trickle of
1180 * removes to get through.
1182 if (dd
->dd_parent
== NULL
) {
1183 spa_t
*spa
= dd
->dd_pool
->dp_spa
;
1184 uint64_t poolsize
= dsl_pool_adjustedsize(dd
->dd_pool
, netfree
);
1185 deferred
= metaslab_class_get_deferred(spa_normal_class(spa
));
1186 if (poolsize
- deferred
< quota
) {
1187 quota
= poolsize
- deferred
;
1193 * If they are requesting more space, and our current estimate
1194 * is over quota, they get to try again unless the actual
1195 * on-disk is over quota and there are no pending changes (which
1196 * may free up space for us).
1198 if (used_on_disk
+ est_inflight
>= quota
) {
1199 if (est_inflight
> 0 || used_on_disk
< quota
||
1200 (retval
== ENOSPC
&& used_on_disk
< quota
+ deferred
))
1202 dprintf_dd(dd
, "failing: used=%lluK inflight = %lluK "
1203 "quota=%lluK tr=%lluK err=%d\n",
1204 used_on_disk
>>10, est_inflight
>>10,
1205 quota
>>10, asize
>>10, retval
);
1206 mutex_exit(&dd
->dd_lock
);
1207 DMU_TX_STAT_BUMP(dmu_tx_quota
);
1208 return (SET_ERROR(retval
));
1211 /* We need to up our estimated delta before dropping dd_lock */
1212 dd
->dd_tempreserved
[txgidx
] += asize
;
1214 parent_rsrv
= parent_delta(dd
, used_on_disk
+ est_inflight
,
1216 mutex_exit(&dd
->dd_lock
);
1218 tr
= kmem_zalloc(sizeof (struct tempreserve
), KM_SLEEP
);
1220 tr
->tr_size
= asize
;
1221 list_insert_tail(tr_list
, tr
);
1223 /* see if it's OK with our parent */
1224 if (dd
->dd_parent
&& parent_rsrv
) {
1225 boolean_t ismos
= (dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
1227 return (dsl_dir_tempreserve_impl(dd
->dd_parent
,
1228 parent_rsrv
, netfree
, ismos
, TRUE
, tr_list
, tx
, FALSE
));
1235 * Reserve space in this dsl_dir, to be used in this tx's txg.
1236 * After the space has been dirtied (and dsl_dir_willuse_space()
1237 * has been called), the reservation should be canceled, using
1238 * dsl_dir_tempreserve_clear().
1241 dsl_dir_tempreserve_space(dsl_dir_t
*dd
, uint64_t lsize
, uint64_t asize
,
1242 uint64_t fsize
, uint64_t usize
, void **tr_cookiep
, dmu_tx_t
*tx
)
1252 tr_list
= kmem_alloc(sizeof (list_t
), KM_SLEEP
);
1253 list_create(tr_list
, sizeof (struct tempreserve
),
1254 offsetof(struct tempreserve
, tr_node
));
1255 ASSERT3S(asize
, >, 0);
1256 ASSERT3S(fsize
, >=, 0);
1258 err
= arc_tempreserve_space(lsize
, tx
->tx_txg
);
1260 struct tempreserve
*tr
;
1262 tr
= kmem_zalloc(sizeof (struct tempreserve
), KM_SLEEP
);
1263 tr
->tr_size
= lsize
;
1264 list_insert_tail(tr_list
, tr
);
1266 if (err
== EAGAIN
) {
1268 * If arc_memory_throttle() detected that pageout
1269 * is running and we are low on memory, we delay new
1270 * non-pageout transactions to give pageout an
1273 * It is unfortunate to be delaying while the caller's
1276 txg_delay(dd
->dd_pool
, tx
->tx_txg
,
1277 MSEC2NSEC(10), MSEC2NSEC(10));
1278 err
= SET_ERROR(ERESTART
);
1283 err
= dsl_dir_tempreserve_impl(dd
, asize
, fsize
>= asize
,
1284 FALSE
, asize
> usize
, tr_list
, tx
, TRUE
);
1288 dsl_dir_tempreserve_clear(tr_list
, tx
);
1290 *tr_cookiep
= tr_list
;
1296 * Clear a temporary reservation that we previously made with
1297 * dsl_dir_tempreserve_space().
1300 dsl_dir_tempreserve_clear(void *tr_cookie
, dmu_tx_t
*tx
)
1302 int txgidx
= tx
->tx_txg
& TXG_MASK
;
1303 list_t
*tr_list
= tr_cookie
;
1304 struct tempreserve
*tr
;
1306 ASSERT3U(tx
->tx_txg
, !=, 0);
1308 if (tr_cookie
== NULL
)
1311 while ((tr
= list_head(tr_list
)) != NULL
) {
1313 mutex_enter(&tr
->tr_ds
->dd_lock
);
1314 ASSERT3U(tr
->tr_ds
->dd_tempreserved
[txgidx
], >=,
1316 tr
->tr_ds
->dd_tempreserved
[txgidx
] -= tr
->tr_size
;
1317 mutex_exit(&tr
->tr_ds
->dd_lock
);
1319 arc_tempreserve_clear(tr
->tr_size
);
1321 list_remove(tr_list
, tr
);
1322 kmem_free(tr
, sizeof (struct tempreserve
));
1325 kmem_free(tr_list
, sizeof (list_t
));
1329 * This should be called from open context when we think we're going to write
1330 * or free space, for example when dirtying data. Be conservative; it's okay
1331 * to write less space or free more, but we don't want to write more or free
1332 * less than the amount specified.
1334 * NOTE: The behavior of this function is identical to the Illumos / FreeBSD
1335 * version however it has been adjusted to use an iterative rather then
1336 * recursive algorithm to minimize stack usage.
1339 dsl_dir_willuse_space(dsl_dir_t
*dd
, int64_t space
, dmu_tx_t
*tx
)
1341 int64_t parent_space
;
1345 mutex_enter(&dd
->dd_lock
);
1347 dd
->dd_space_towrite
[tx
->tx_txg
& TXG_MASK
] += space
;
1349 est_used
= dsl_dir_space_towrite(dd
) +
1350 dsl_dir_phys(dd
)->dd_used_bytes
;
1351 parent_space
= parent_delta(dd
, est_used
, space
);
1352 mutex_exit(&dd
->dd_lock
);
1354 /* Make sure that we clean up dd_space_to* */
1355 dsl_dir_dirty(dd
, tx
);
1358 space
= parent_space
;
1359 } while (space
&& dd
);
1362 /* call from syncing context when we actually write/free space for this dd */
1364 dsl_dir_diduse_space(dsl_dir_t
*dd
, dd_used_t type
,
1365 int64_t used
, int64_t compressed
, int64_t uncompressed
, dmu_tx_t
*tx
)
1367 int64_t accounted_delta
;
1370 * dsl_dataset_set_refreservation_sync_impl() calls this with
1371 * dd_lock held, so that it can atomically update
1372 * ds->ds_reserved and the dsl_dir accounting, so that
1373 * dsl_dataset_check_quota() can see dataset and dir accounting
1376 boolean_t needlock
= !MUTEX_HELD(&dd
->dd_lock
);
1378 ASSERT(dmu_tx_is_syncing(tx
));
1379 ASSERT(type
< DD_USED_NUM
);
1381 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1384 mutex_enter(&dd
->dd_lock
);
1386 parent_delta(dd
, dsl_dir_phys(dd
)->dd_used_bytes
, used
);
1387 ASSERT(used
>= 0 || dsl_dir_phys(dd
)->dd_used_bytes
>= -used
);
1388 ASSERT(compressed
>= 0 ||
1389 dsl_dir_phys(dd
)->dd_compressed_bytes
>= -compressed
);
1390 ASSERT(uncompressed
>= 0 ||
1391 dsl_dir_phys(dd
)->dd_uncompressed_bytes
>= -uncompressed
);
1392 dsl_dir_phys(dd
)->dd_used_bytes
+= used
;
1393 dsl_dir_phys(dd
)->dd_uncompressed_bytes
+= uncompressed
;
1394 dsl_dir_phys(dd
)->dd_compressed_bytes
+= compressed
;
1396 if (dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
1398 dsl_dir_phys(dd
)->dd_used_breakdown
[type
] >= -used
);
1399 dsl_dir_phys(dd
)->dd_used_breakdown
[type
] += used
;
1404 for (t
= 0; t
< DD_USED_NUM
; t
++)
1405 u
+= dsl_dir_phys(dd
)->dd_used_breakdown
[t
];
1406 ASSERT3U(u
, ==, dsl_dir_phys(dd
)->dd_used_bytes
);
1411 mutex_exit(&dd
->dd_lock
);
1413 if (dd
->dd_parent
!= NULL
) {
1414 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD
,
1415 accounted_delta
, compressed
, uncompressed
, tx
);
1416 dsl_dir_transfer_space(dd
->dd_parent
,
1417 used
- accounted_delta
,
1418 DD_USED_CHILD_RSRV
, DD_USED_CHILD
, tx
);
1423 dsl_dir_transfer_space(dsl_dir_t
*dd
, int64_t delta
,
1424 dd_used_t oldtype
, dd_used_t newtype
, dmu_tx_t
*tx
)
1426 ASSERT(dmu_tx_is_syncing(tx
));
1427 ASSERT(oldtype
< DD_USED_NUM
);
1428 ASSERT(newtype
< DD_USED_NUM
);
1431 !(dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
))
1434 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1435 mutex_enter(&dd
->dd_lock
);
1437 dsl_dir_phys(dd
)->dd_used_breakdown
[oldtype
] >= delta
:
1438 dsl_dir_phys(dd
)->dd_used_breakdown
[newtype
] >= -delta
);
1439 ASSERT(dsl_dir_phys(dd
)->dd_used_bytes
>= ABS(delta
));
1440 dsl_dir_phys(dd
)->dd_used_breakdown
[oldtype
] -= delta
;
1441 dsl_dir_phys(dd
)->dd_used_breakdown
[newtype
] += delta
;
1442 mutex_exit(&dd
->dd_lock
);
1445 typedef struct dsl_dir_set_qr_arg
{
1446 const char *ddsqra_name
;
1447 zprop_source_t ddsqra_source
;
1448 uint64_t ddsqra_value
;
1449 } dsl_dir_set_qr_arg_t
;
1452 dsl_dir_set_quota_check(void *arg
, dmu_tx_t
*tx
)
1454 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1455 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1458 uint64_t towrite
, newval
;
1460 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
1464 error
= dsl_prop_predict(ds
->ds_dir
, "quota",
1465 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
1467 dsl_dataset_rele(ds
, FTAG
);
1472 dsl_dataset_rele(ds
, FTAG
);
1476 mutex_enter(&ds
->ds_dir
->dd_lock
);
1478 * If we are doing the preliminary check in open context, and
1479 * there are pending changes, then don't fail it, since the
1480 * pending changes could under-estimate the amount of space to be
1483 towrite
= dsl_dir_space_towrite(ds
->ds_dir
);
1484 if ((dmu_tx_is_syncing(tx
) || towrite
== 0) &&
1485 (newval
< dsl_dir_phys(ds
->ds_dir
)->dd_reserved
||
1486 newval
< dsl_dir_phys(ds
->ds_dir
)->dd_used_bytes
+ towrite
)) {
1487 error
= SET_ERROR(ENOSPC
);
1489 mutex_exit(&ds
->ds_dir
->dd_lock
);
1490 dsl_dataset_rele(ds
, FTAG
);
1495 dsl_dir_set_quota_sync(void *arg
, dmu_tx_t
*tx
)
1497 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1498 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1502 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
1504 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_RECVD_PROPS
) {
1505 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_QUOTA
),
1506 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
1507 &ddsqra
->ddsqra_value
, tx
);
1509 VERIFY0(dsl_prop_get_int_ds(ds
,
1510 zfs_prop_to_name(ZFS_PROP_QUOTA
), &newval
));
1512 newval
= ddsqra
->ddsqra_value
;
1513 spa_history_log_internal_ds(ds
, "set", tx
, "%s=%lld",
1514 zfs_prop_to_name(ZFS_PROP_QUOTA
), (longlong_t
)newval
);
1517 dmu_buf_will_dirty(ds
->ds_dir
->dd_dbuf
, tx
);
1518 mutex_enter(&ds
->ds_dir
->dd_lock
);
1519 dsl_dir_phys(ds
->ds_dir
)->dd_quota
= newval
;
1520 mutex_exit(&ds
->ds_dir
->dd_lock
);
1521 dsl_dataset_rele(ds
, FTAG
);
1525 dsl_dir_set_quota(const char *ddname
, zprop_source_t source
, uint64_t quota
)
1527 dsl_dir_set_qr_arg_t ddsqra
;
1529 ddsqra
.ddsqra_name
= ddname
;
1530 ddsqra
.ddsqra_source
= source
;
1531 ddsqra
.ddsqra_value
= quota
;
1533 return (dsl_sync_task(ddname
, dsl_dir_set_quota_check
,
1534 dsl_dir_set_quota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
1538 dsl_dir_set_reservation_check(void *arg
, dmu_tx_t
*tx
)
1540 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1541 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1544 uint64_t newval
, used
, avail
;
1547 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
1553 * If we are doing the preliminary check in open context, the
1554 * space estimates may be inaccurate.
1556 if (!dmu_tx_is_syncing(tx
)) {
1557 dsl_dataset_rele(ds
, FTAG
);
1561 error
= dsl_prop_predict(ds
->ds_dir
,
1562 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1563 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
1565 dsl_dataset_rele(ds
, FTAG
);
1569 mutex_enter(&dd
->dd_lock
);
1570 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1571 mutex_exit(&dd
->dd_lock
);
1573 if (dd
->dd_parent
) {
1574 avail
= dsl_dir_space_available(dd
->dd_parent
,
1577 avail
= dsl_pool_adjustedsize(dd
->dd_pool
, B_FALSE
) - used
;
1580 if (MAX(used
, newval
) > MAX(used
, dsl_dir_phys(dd
)->dd_reserved
)) {
1581 uint64_t delta
= MAX(used
, newval
) -
1582 MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1584 if (delta
> avail
||
1585 (dsl_dir_phys(dd
)->dd_quota
> 0 &&
1586 newval
> dsl_dir_phys(dd
)->dd_quota
))
1587 error
= SET_ERROR(ENOSPC
);
1590 dsl_dataset_rele(ds
, FTAG
);
1595 dsl_dir_set_reservation_sync_impl(dsl_dir_t
*dd
, uint64_t value
, dmu_tx_t
*tx
)
1600 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1602 mutex_enter(&dd
->dd_lock
);
1603 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1604 delta
= MAX(used
, value
) - MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1605 dsl_dir_phys(dd
)->dd_reserved
= value
;
1607 if (dd
->dd_parent
!= NULL
) {
1608 /* Roll up this additional usage into our ancestors */
1609 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD_RSRV
,
1612 mutex_exit(&dd
->dd_lock
);
1616 dsl_dir_set_reservation_sync(void *arg
, dmu_tx_t
*tx
)
1618 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1619 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1623 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
1625 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_RECVD_PROPS
) {
1626 dsl_prop_set_sync_impl(ds
,
1627 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1628 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
1629 &ddsqra
->ddsqra_value
, tx
);
1631 VERIFY0(dsl_prop_get_int_ds(ds
,
1632 zfs_prop_to_name(ZFS_PROP_RESERVATION
), &newval
));
1634 newval
= ddsqra
->ddsqra_value
;
1635 spa_history_log_internal_ds(ds
, "set", tx
, "%s=%lld",
1636 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1637 (longlong_t
)newval
);
1640 dsl_dir_set_reservation_sync_impl(ds
->ds_dir
, newval
, tx
);
1641 dsl_dataset_rele(ds
, FTAG
);
1645 dsl_dir_set_reservation(const char *ddname
, zprop_source_t source
,
1646 uint64_t reservation
)
1648 dsl_dir_set_qr_arg_t ddsqra
;
1650 ddsqra
.ddsqra_name
= ddname
;
1651 ddsqra
.ddsqra_source
= source
;
1652 ddsqra
.ddsqra_value
= reservation
;
1654 return (dsl_sync_task(ddname
, dsl_dir_set_reservation_check
,
1655 dsl_dir_set_reservation_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
1659 closest_common_ancestor(dsl_dir_t
*ds1
, dsl_dir_t
*ds2
)
1661 for (; ds1
; ds1
= ds1
->dd_parent
) {
1663 for (dd
= ds2
; dd
; dd
= dd
->dd_parent
) {
1672 * If delta is applied to dd, how much of that delta would be applied to
1673 * ancestor? Syncing context only.
1676 would_change(dsl_dir_t
*dd
, int64_t delta
, dsl_dir_t
*ancestor
)
1681 mutex_enter(&dd
->dd_lock
);
1682 delta
= parent_delta(dd
, dsl_dir_phys(dd
)->dd_used_bytes
, delta
);
1683 mutex_exit(&dd
->dd_lock
);
1684 return (would_change(dd
->dd_parent
, delta
, ancestor
));
1687 typedef struct dsl_dir_rename_arg
{
1688 const char *ddra_oldname
;
1689 const char *ddra_newname
;
1691 } dsl_dir_rename_arg_t
;
1695 dsl_valid_rename(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *arg
)
1698 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
1700 dsl_dataset_name(ds
, namebuf
);
1702 if (strlen(namebuf
) + *deltap
>= ZFS_MAX_DATASET_NAME_LEN
)
1703 return (SET_ERROR(ENAMETOOLONG
));
1708 dsl_dir_rename_check(void *arg
, dmu_tx_t
*tx
)
1710 dsl_dir_rename_arg_t
*ddra
= arg
;
1711 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1712 dsl_dir_t
*dd
, *newparent
;
1713 const char *mynewname
;
1715 int delta
= strlen(ddra
->ddra_newname
) - strlen(ddra
->ddra_oldname
);
1717 /* target dir should exist */
1718 error
= dsl_dir_hold(dp
, ddra
->ddra_oldname
, FTAG
, &dd
, NULL
);
1722 /* new parent should exist */
1723 error
= dsl_dir_hold(dp
, ddra
->ddra_newname
, FTAG
,
1724 &newparent
, &mynewname
);
1726 dsl_dir_rele(dd
, FTAG
);
1730 /* can't rename to different pool */
1731 if (dd
->dd_pool
!= newparent
->dd_pool
) {
1732 dsl_dir_rele(newparent
, FTAG
);
1733 dsl_dir_rele(dd
, FTAG
);
1734 return (SET_ERROR(EXDEV
));
1737 /* new name should not already exist */
1738 if (mynewname
== NULL
) {
1739 dsl_dir_rele(newparent
, FTAG
);
1740 dsl_dir_rele(dd
, FTAG
);
1741 return (SET_ERROR(EEXIST
));
1744 /* if the name length is growing, validate child name lengths */
1746 error
= dmu_objset_find_dp(dp
, dd
->dd_object
, dsl_valid_rename
,
1747 &delta
, DS_FIND_CHILDREN
| DS_FIND_SNAPSHOTS
);
1749 dsl_dir_rele(newparent
, FTAG
);
1750 dsl_dir_rele(dd
, FTAG
);
1755 if (dmu_tx_is_syncing(tx
)) {
1756 if (spa_feature_is_active(dp
->dp_spa
,
1757 SPA_FEATURE_FS_SS_LIMIT
)) {
1759 * Although this is the check function and we don't
1760 * normally make on-disk changes in check functions,
1761 * we need to do that here.
1763 * Ensure this portion of the tree's counts have been
1764 * initialized in case the new parent has limits set.
1766 dsl_dir_init_fs_ss_count(dd
, tx
);
1770 if (newparent
!= dd
->dd_parent
) {
1771 /* is there enough space? */
1773 MAX(dsl_dir_phys(dd
)->dd_used_bytes
,
1774 dsl_dir_phys(dd
)->dd_reserved
);
1775 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1776 uint64_t fs_cnt
= 0;
1777 uint64_t ss_cnt
= 0;
1779 if (dsl_dir_is_zapified(dd
)) {
1782 err
= zap_lookup(os
, dd
->dd_object
,
1783 DD_FIELD_FILESYSTEM_COUNT
, sizeof (fs_cnt
), 1,
1785 if (err
!= ENOENT
&& err
!= 0) {
1786 dsl_dir_rele(newparent
, FTAG
);
1787 dsl_dir_rele(dd
, FTAG
);
1792 * have to add 1 for the filesystem itself that we're
1797 err
= zap_lookup(os
, dd
->dd_object
,
1798 DD_FIELD_SNAPSHOT_COUNT
, sizeof (ss_cnt
), 1,
1800 if (err
!= ENOENT
&& err
!= 0) {
1801 dsl_dir_rele(newparent
, FTAG
);
1802 dsl_dir_rele(dd
, FTAG
);
1807 /* no rename into our descendant */
1808 if (closest_common_ancestor(dd
, newparent
) == dd
) {
1809 dsl_dir_rele(newparent
, FTAG
);
1810 dsl_dir_rele(dd
, FTAG
);
1811 return (SET_ERROR(EINVAL
));
1814 error
= dsl_dir_transfer_possible(dd
->dd_parent
,
1815 newparent
, fs_cnt
, ss_cnt
, myspace
, ddra
->ddra_cred
);
1817 dsl_dir_rele(newparent
, FTAG
);
1818 dsl_dir_rele(dd
, FTAG
);
1823 dsl_dir_rele(newparent
, FTAG
);
1824 dsl_dir_rele(dd
, FTAG
);
1829 dsl_dir_rename_sync(void *arg
, dmu_tx_t
*tx
)
1831 dsl_dir_rename_arg_t
*ddra
= arg
;
1832 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1833 dsl_dir_t
*dd
, *newparent
;
1834 const char *mynewname
;
1836 objset_t
*mos
= dp
->dp_meta_objset
;
1838 VERIFY0(dsl_dir_hold(dp
, ddra
->ddra_oldname
, FTAG
, &dd
, NULL
));
1839 VERIFY0(dsl_dir_hold(dp
, ddra
->ddra_newname
, FTAG
, &newparent
,
1842 /* Log this before we change the name. */
1843 spa_history_log_internal_dd(dd
, "rename", tx
,
1844 "-> %s", ddra
->ddra_newname
);
1846 if (newparent
!= dd
->dd_parent
) {
1847 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1848 uint64_t fs_cnt
= 0;
1849 uint64_t ss_cnt
= 0;
1852 * We already made sure the dd counts were initialized in the
1855 if (spa_feature_is_active(dp
->dp_spa
,
1856 SPA_FEATURE_FS_SS_LIMIT
)) {
1857 VERIFY0(zap_lookup(os
, dd
->dd_object
,
1858 DD_FIELD_FILESYSTEM_COUNT
, sizeof (fs_cnt
), 1,
1860 /* add 1 for the filesystem itself that we're moving */
1863 VERIFY0(zap_lookup(os
, dd
->dd_object
,
1864 DD_FIELD_SNAPSHOT_COUNT
, sizeof (ss_cnt
), 1,
1868 dsl_fs_ss_count_adjust(dd
->dd_parent
, -fs_cnt
,
1869 DD_FIELD_FILESYSTEM_COUNT
, tx
);
1870 dsl_fs_ss_count_adjust(newparent
, fs_cnt
,
1871 DD_FIELD_FILESYSTEM_COUNT
, tx
);
1873 dsl_fs_ss_count_adjust(dd
->dd_parent
, -ss_cnt
,
1874 DD_FIELD_SNAPSHOT_COUNT
, tx
);
1875 dsl_fs_ss_count_adjust(newparent
, ss_cnt
,
1876 DD_FIELD_SNAPSHOT_COUNT
, tx
);
1878 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD
,
1879 -dsl_dir_phys(dd
)->dd_used_bytes
,
1880 -dsl_dir_phys(dd
)->dd_compressed_bytes
,
1881 -dsl_dir_phys(dd
)->dd_uncompressed_bytes
, tx
);
1882 dsl_dir_diduse_space(newparent
, DD_USED_CHILD
,
1883 dsl_dir_phys(dd
)->dd_used_bytes
,
1884 dsl_dir_phys(dd
)->dd_compressed_bytes
,
1885 dsl_dir_phys(dd
)->dd_uncompressed_bytes
, tx
);
1887 if (dsl_dir_phys(dd
)->dd_reserved
>
1888 dsl_dir_phys(dd
)->dd_used_bytes
) {
1889 uint64_t unused_rsrv
= dsl_dir_phys(dd
)->dd_reserved
-
1890 dsl_dir_phys(dd
)->dd_used_bytes
;
1892 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD_RSRV
,
1893 -unused_rsrv
, 0, 0, tx
);
1894 dsl_dir_diduse_space(newparent
, DD_USED_CHILD_RSRV
,
1895 unused_rsrv
, 0, 0, tx
);
1899 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1901 /* remove from old parent zapobj */
1902 error
= zap_remove(mos
,
1903 dsl_dir_phys(dd
->dd_parent
)->dd_child_dir_zapobj
,
1907 (void) strlcpy(dd
->dd_myname
, mynewname
,
1908 sizeof (dd
->dd_myname
));
1909 dsl_dir_rele(dd
->dd_parent
, dd
);
1910 dsl_dir_phys(dd
)->dd_parent_obj
= newparent
->dd_object
;
1911 VERIFY0(dsl_dir_hold_obj(dp
,
1912 newparent
->dd_object
, NULL
, dd
, &dd
->dd_parent
));
1914 /* add to new parent zapobj */
1915 VERIFY0(zap_add(mos
, dsl_dir_phys(newparent
)->dd_child_dir_zapobj
,
1916 dd
->dd_myname
, 8, 1, &dd
->dd_object
, tx
));
1918 zvol_rename_minors(dp
->dp_spa
, ddra
->ddra_oldname
,
1919 ddra
->ddra_newname
, B_TRUE
);
1921 dsl_prop_notify_all(dd
);
1923 dsl_dir_rele(newparent
, FTAG
);
1924 dsl_dir_rele(dd
, FTAG
);
1928 dsl_dir_rename(const char *oldname
, const char *newname
)
1930 dsl_dir_rename_arg_t ddra
;
1932 ddra
.ddra_oldname
= oldname
;
1933 ddra
.ddra_newname
= newname
;
1934 ddra
.ddra_cred
= CRED();
1936 return (dsl_sync_task(oldname
,
1937 dsl_dir_rename_check
, dsl_dir_rename_sync
, &ddra
,
1938 3, ZFS_SPACE_CHECK_RESERVED
));
1942 dsl_dir_transfer_possible(dsl_dir_t
*sdd
, dsl_dir_t
*tdd
,
1943 uint64_t fs_cnt
, uint64_t ss_cnt
, uint64_t space
, cred_t
*cr
)
1945 dsl_dir_t
*ancestor
;
1950 ancestor
= closest_common_ancestor(sdd
, tdd
);
1951 adelta
= would_change(sdd
, -space
, ancestor
);
1952 avail
= dsl_dir_space_available(tdd
, ancestor
, adelta
, FALSE
);
1954 return (SET_ERROR(ENOSPC
));
1956 err
= dsl_fs_ss_limit_check(tdd
, fs_cnt
, ZFS_PROP_FILESYSTEM_LIMIT
,
1960 err
= dsl_fs_ss_limit_check(tdd
, ss_cnt
, ZFS_PROP_SNAPSHOT_LIMIT
,
1969 dsl_dir_snap_cmtime(dsl_dir_t
*dd
)
1973 mutex_enter(&dd
->dd_lock
);
1974 t
= dd
->dd_snap_cmtime
;
1975 mutex_exit(&dd
->dd_lock
);
1981 dsl_dir_snap_cmtime_update(dsl_dir_t
*dd
)
1986 mutex_enter(&dd
->dd_lock
);
1987 dd
->dd_snap_cmtime
= t
;
1988 mutex_exit(&dd
->dd_lock
);
1992 dsl_dir_zapify(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
1994 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
1995 dmu_object_zapify(mos
, dd
->dd_object
, DMU_OT_DSL_DIR
, tx
);
1999 dsl_dir_is_zapified(dsl_dir_t
*dd
)
2001 dmu_object_info_t doi
;
2003 dmu_object_info_from_db(dd
->dd_dbuf
, &doi
);
2004 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);
2007 #if defined(_KERNEL) && defined(HAVE_SPL)
2008 EXPORT_SYMBOL(dsl_dir_set_quota
);
2009 EXPORT_SYMBOL(dsl_dir_set_reservation
);