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, 2016 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 2015 Nexenta Systems, 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>
48 #include "zfs_namecheck.h"
52 * Filesystem and Snapshot Limits
53 * ------------------------------
55 * These limits are used to restrict the number of filesystems and/or snapshots
56 * that can be created at a given level in the tree or below. A typical
57 * use-case is with a delegated dataset where the administrator wants to ensure
58 * that a user within the zone is not creating too many additional filesystems
59 * or snapshots, even though they're not exceeding their space quota.
61 * The filesystem and snapshot counts are stored as extensible properties. This
62 * capability is controlled by a feature flag and must be enabled to be used.
63 * Once enabled, the feature is not active until the first limit is set. At
64 * that point, future operations to create/destroy filesystems or snapshots
65 * will validate and update the counts.
67 * Because the count properties will not exist before the feature is active,
68 * the counts are updated when a limit is first set on an uninitialized
69 * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
70 * all of the nested filesystems/snapshots. Thus, a new leaf node has a
71 * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
72 * snapshot count properties on a node indicate uninitialized counts on that
73 * node.) When first setting a limit on an uninitialized node, the code starts
74 * at the filesystem with the new limit and descends into all sub-filesystems
75 * to add the count properties.
77 * In practice this is lightweight since a limit is typically set when the
78 * filesystem is created and thus has no children. Once valid, changing the
79 * limit value won't require a re-traversal since the counts are already valid.
80 * When recursively fixing the counts, if a node with a limit is encountered
81 * during the descent, the counts are known to be valid and there is no need to
82 * descend into that filesystem's children. The counts on filesystems above the
83 * one with the new limit will still be uninitialized, unless a limit is
84 * eventually set on one of those filesystems. The counts are always recursively
85 * updated when a limit is set on a dataset, unless there is already a limit.
86 * When a new limit value is set on a filesystem with an existing limit, it is
87 * possible for the new limit to be less than the current count at that level
88 * since a user who can change the limit is also allowed to exceed the limit.
90 * Once the feature is active, then whenever a filesystem or snapshot is
91 * created, the code recurses up the tree, validating the new count against the
92 * limit at each initialized level. In practice, most levels will not have a
93 * limit set. If there is a limit at any initialized level up the tree, the
94 * check must pass or the creation will fail. Likewise, when a filesystem or
95 * snapshot is destroyed, the counts are recursively adjusted all the way up
96 * the initizized nodes in the tree. Renaming a filesystem into different point
97 * in the tree will first validate, then update the counts on each branch up to
98 * the common ancestor. A receive will also validate the counts and then update
101 * An exception to the above behavior is that the limit is not enforced if the
102 * user has permission to modify the limit. This is primarily so that
103 * recursive snapshots in the global zone always work. We want to prevent a
104 * denial-of-service in which a lower level delegated dataset could max out its
105 * limit and thus block recursive snapshots from being taken in the global zone.
106 * Because of this, it is possible for the snapshot count to be over the limit
107 * and snapshots taken in the global zone could cause a lower level dataset to
108 * hit or exceed its limit. The administrator taking the global zone recursive
109 * snapshot should be aware of this side-effect and behave accordingly.
110 * For consistency, the filesystem limit is also not enforced if the user can
113 * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
114 * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
115 * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
116 * dsl_dir_init_fs_ss_count().
118 * There is a special case when we receive a filesystem that already exists. In
119 * this case a temporary clone name of %X is created (see dmu_recv_begin). We
120 * never update the filesystem counts for temporary clones.
122 * Likewise, we do not update the snapshot counts for temporary snapshots,
123 * such as those created by zfs diff.
126 extern inline dsl_dir_phys_t
*dsl_dir_phys(dsl_dir_t
*dd
);
128 static uint64_t dsl_dir_space_towrite(dsl_dir_t
*dd
);
130 typedef struct ddulrt_arg
{
131 dsl_dir_t
*ddulrta_dd
;
136 dsl_dir_evict_async(void *dbu
)
139 dsl_pool_t
*dp
= dd
->dd_pool
;
144 for (t
= 0; t
< TXG_SIZE
; t
++) {
145 ASSERT(!txg_list_member(&dp
->dp_dirty_dirs
, dd
, t
));
146 ASSERT(dd
->dd_tempreserved
[t
] == 0);
147 ASSERT(dd
->dd_space_towrite
[t
] == 0);
151 dsl_dir_async_rele(dd
->dd_parent
, dd
);
153 spa_async_close(dd
->dd_pool
->dp_spa
, dd
);
156 mutex_destroy(&dd
->dd_lock
);
157 kmem_free(dd
, sizeof (dsl_dir_t
));
161 dsl_dir_hold_obj(dsl_pool_t
*dp
, uint64_t ddobj
,
162 const char *tail
, void *tag
, dsl_dir_t
**ddp
)
168 ASSERT(dsl_pool_config_held(dp
));
170 err
= dmu_bonus_hold(dp
->dp_meta_objset
, ddobj
, tag
, &dbuf
);
173 dd
= dmu_buf_get_user(dbuf
);
176 dmu_object_info_t doi
;
177 dmu_object_info_from_db(dbuf
, &doi
);
178 ASSERT3U(doi
.doi_bonus_type
, ==, DMU_OT_DSL_DIR
);
179 ASSERT3U(doi
.doi_bonus_size
, >=, sizeof (dsl_dir_phys_t
));
185 dd
= kmem_zalloc(sizeof (dsl_dir_t
), KM_SLEEP
);
186 dd
->dd_object
= ddobj
;
189 mutex_init(&dd
->dd_lock
, NULL
, MUTEX_DEFAULT
, NULL
);
192 dsl_dir_snap_cmtime_update(dd
);
194 if (dsl_dir_phys(dd
)->dd_parent_obj
) {
195 err
= dsl_dir_hold_obj(dp
,
196 dsl_dir_phys(dd
)->dd_parent_obj
, NULL
, dd
,
204 err
= zap_lookup(dp
->dp_meta_objset
,
205 dsl_dir_phys(dd
->dd_parent
)->
206 dd_child_dir_zapobj
, tail
,
207 sizeof (foundobj
), 1, &foundobj
);
208 ASSERT(err
|| foundobj
== ddobj
);
210 (void) strcpy(dd
->dd_myname
, tail
);
212 err
= zap_value_search(dp
->dp_meta_objset
,
213 dsl_dir_phys(dd
->dd_parent
)->
215 ddobj
, 0, dd
->dd_myname
);
220 (void) strcpy(dd
->dd_myname
, spa_name(dp
->dp_spa
));
223 if (dsl_dir_is_clone(dd
)) {
224 dmu_buf_t
*origin_bonus
;
225 dsl_dataset_phys_t
*origin_phys
;
228 * We can't open the origin dataset, because
229 * that would require opening this dsl_dir.
230 * Just look at its phys directly instead.
232 err
= dmu_bonus_hold(dp
->dp_meta_objset
,
233 dsl_dir_phys(dd
)->dd_origin_obj
, FTAG
,
237 origin_phys
= origin_bonus
->db_data
;
239 origin_phys
->ds_creation_txg
;
240 dmu_buf_rele(origin_bonus
, FTAG
);
243 dmu_buf_init_user(&dd
->dd_dbu
, NULL
, dsl_dir_evict_async
,
245 winner
= dmu_buf_set_user_ie(dbuf
, &dd
->dd_dbu
);
246 if (winner
!= NULL
) {
248 dsl_dir_rele(dd
->dd_parent
, dd
);
250 mutex_destroy(&dd
->dd_lock
);
251 kmem_free(dd
, sizeof (dsl_dir_t
));
254 spa_open_ref(dp
->dp_spa
, dd
);
259 * The dsl_dir_t has both open-to-close and instantiate-to-evict
260 * holds on the spa. We need the open-to-close holds because
261 * otherwise the spa_refcnt wouldn't change when we open a
262 * dir which the spa also has open, so we could incorrectly
263 * think it was OK to unload/export/destroy the pool. We need
264 * the instantiate-to-evict hold because the dsl_dir_t has a
265 * pointer to the dd_pool, which has a pointer to the spa_t.
267 spa_open_ref(dp
->dp_spa
, tag
);
268 ASSERT3P(dd
->dd_pool
, ==, dp
);
269 ASSERT3U(dd
->dd_object
, ==, ddobj
);
270 ASSERT3P(dd
->dd_dbuf
, ==, dbuf
);
276 dsl_dir_rele(dd
->dd_parent
, dd
);
278 mutex_destroy(&dd
->dd_lock
);
279 kmem_free(dd
, sizeof (dsl_dir_t
));
280 dmu_buf_rele(dbuf
, tag
);
285 dsl_dir_rele(dsl_dir_t
*dd
, void *tag
)
287 dprintf_dd(dd
, "%s\n", "");
288 spa_close(dd
->dd_pool
->dp_spa
, tag
);
289 dmu_buf_rele(dd
->dd_dbuf
, tag
);
293 * Remove a reference to the given dsl dir that is being asynchronously
294 * released. Async releases occur from a taskq performing eviction of
295 * dsl datasets and dirs. This process is identical to a normal release
296 * with the exception of using the async API for releasing the reference on
300 dsl_dir_async_rele(dsl_dir_t
*dd
, void *tag
)
302 dprintf_dd(dd
, "%s\n", "");
303 spa_async_close(dd
->dd_pool
->dp_spa
, tag
);
304 dmu_buf_rele(dd
->dd_dbuf
, tag
);
307 /* buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes */
309 dsl_dir_name(dsl_dir_t
*dd
, char *buf
)
312 dsl_dir_name(dd
->dd_parent
, buf
);
313 VERIFY3U(strlcat(buf
, "/", ZFS_MAX_DATASET_NAME_LEN
), <,
314 ZFS_MAX_DATASET_NAME_LEN
);
318 if (!MUTEX_HELD(&dd
->dd_lock
)) {
320 * recursive mutex so that we can use
321 * dprintf_dd() with dd_lock held
323 mutex_enter(&dd
->dd_lock
);
324 VERIFY3U(strlcat(buf
, dd
->dd_myname
, ZFS_MAX_DATASET_NAME_LEN
),
325 <, ZFS_MAX_DATASET_NAME_LEN
);
326 mutex_exit(&dd
->dd_lock
);
328 VERIFY3U(strlcat(buf
, dd
->dd_myname
, ZFS_MAX_DATASET_NAME_LEN
),
329 <, ZFS_MAX_DATASET_NAME_LEN
);
333 /* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
335 dsl_dir_namelen(dsl_dir_t
*dd
)
340 /* parent's name + 1 for the "/" */
341 result
= dsl_dir_namelen(dd
->dd_parent
) + 1;
344 if (!MUTEX_HELD(&dd
->dd_lock
)) {
345 /* see dsl_dir_name */
346 mutex_enter(&dd
->dd_lock
);
347 result
+= strlen(dd
->dd_myname
);
348 mutex_exit(&dd
->dd_lock
);
350 result
+= strlen(dd
->dd_myname
);
357 getcomponent(const char *path
, char *component
, const char **nextp
)
361 if ((path
== NULL
) || (path
[0] == '\0'))
362 return (SET_ERROR(ENOENT
));
363 /* This would be a good place to reserve some namespace... */
364 p
= strpbrk(path
, "/@");
365 if (p
&& (p
[1] == '/' || p
[1] == '@')) {
366 /* two separators in a row */
367 return (SET_ERROR(EINVAL
));
369 if (p
== NULL
|| p
== path
) {
371 * if the first thing is an @ or /, it had better be an
372 * @ and it had better not have any more ats or slashes,
373 * and it had better have something after the @.
376 (p
[0] != '@' || strpbrk(path
+1, "/@") || p
[1] == '\0'))
377 return (SET_ERROR(EINVAL
));
378 if (strlen(path
) >= ZFS_MAX_DATASET_NAME_LEN
)
379 return (SET_ERROR(ENAMETOOLONG
));
380 (void) strcpy(component
, path
);
382 } else if (p
[0] == '/') {
383 if (p
- path
>= ZFS_MAX_DATASET_NAME_LEN
)
384 return (SET_ERROR(ENAMETOOLONG
));
385 (void) strncpy(component
, path
, p
- path
);
386 component
[p
- path
] = '\0';
388 } else if (p
[0] == '@') {
390 * if the next separator is an @, there better not be
393 if (strchr(path
, '/'))
394 return (SET_ERROR(EINVAL
));
395 if (p
- path
>= ZFS_MAX_DATASET_NAME_LEN
)
396 return (SET_ERROR(ENAMETOOLONG
));
397 (void) strncpy(component
, path
, p
- path
);
398 component
[p
- path
] = '\0';
400 panic("invalid p=%p", (void *)p
);
407 * Return the dsl_dir_t, and possibly the last component which couldn't
408 * be found in *tail. The name must be in the specified dsl_pool_t. This
409 * thread must hold the dp_config_rwlock for the pool. Returns NULL if the
410 * path is bogus, or if tail==NULL and we couldn't parse the whole name.
411 * (*tail)[0] == '@' means that the last component is a snapshot.
414 dsl_dir_hold(dsl_pool_t
*dp
, const char *name
, void *tag
,
415 dsl_dir_t
**ddp
, const char **tailp
)
417 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
418 const char *spaname
, *next
, *nextnext
= NULL
;
423 err
= getcomponent(name
, buf
, &next
);
427 /* Make sure the name is in the specified pool. */
428 spaname
= spa_name(dp
->dp_spa
);
429 if (strcmp(buf
, spaname
) != 0)
430 return (SET_ERROR(EXDEV
));
432 ASSERT(dsl_pool_config_held(dp
));
434 err
= dsl_dir_hold_obj(dp
, dp
->dp_root_dir_obj
, NULL
, tag
, &dd
);
439 while (next
!= NULL
) {
441 err
= getcomponent(next
, buf
, &nextnext
);
444 ASSERT(next
[0] != '\0');
447 dprintf("looking up %s in obj%lld\n",
448 buf
, dsl_dir_phys(dd
)->dd_child_dir_zapobj
);
450 err
= zap_lookup(dp
->dp_meta_objset
,
451 dsl_dir_phys(dd
)->dd_child_dir_zapobj
,
452 buf
, sizeof (ddobj
), 1, &ddobj
);
459 err
= dsl_dir_hold_obj(dp
, ddobj
, buf
, tag
, &child_dd
);
462 dsl_dir_rele(dd
, tag
);
468 dsl_dir_rele(dd
, tag
);
473 * It's an error if there's more than one component left, or
474 * tailp==NULL and there's any component left.
477 (tailp
== NULL
|| (nextnext
&& nextnext
[0] != '\0'))) {
479 dsl_dir_rele(dd
, tag
);
480 dprintf("next=%p (%s) tail=%p\n", next
, next
?next
:"", tailp
);
481 err
= SET_ERROR(ENOENT
);
490 * If the counts are already initialized for this filesystem and its
491 * descendants then do nothing, otherwise initialize the counts.
493 * The counts on this filesystem, and those below, may be uninitialized due to
494 * either the use of a pre-existing pool which did not support the
495 * filesystem/snapshot limit feature, or one in which the feature had not yet
498 * Recursively descend the filesystem tree and update the filesystem/snapshot
499 * counts on each filesystem below, then update the cumulative count on the
500 * current filesystem. If the filesystem already has a count set on it,
501 * then we know that its counts, and the counts on the filesystems below it,
502 * are already correct, so we don't have to update this filesystem.
505 dsl_dir_init_fs_ss_count(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
507 uint64_t my_fs_cnt
= 0;
508 uint64_t my_ss_cnt
= 0;
509 dsl_pool_t
*dp
= dd
->dd_pool
;
510 objset_t
*os
= dp
->dp_meta_objset
;
515 ASSERT(spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
));
516 ASSERT(dsl_pool_config_held(dp
));
517 ASSERT(dmu_tx_is_syncing(tx
));
519 dsl_dir_zapify(dd
, tx
);
522 * If the filesystem count has already been initialized then we
523 * don't need to recurse down any further.
525 if (zap_contains(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
) == 0)
528 zc
= kmem_alloc(sizeof (zap_cursor_t
), KM_SLEEP
);
529 za
= kmem_alloc(sizeof (zap_attribute_t
), KM_SLEEP
);
531 /* Iterate my child dirs */
532 for (zap_cursor_init(zc
, os
, dsl_dir_phys(dd
)->dd_child_dir_zapobj
);
533 zap_cursor_retrieve(zc
, za
) == 0; zap_cursor_advance(zc
)) {
537 VERIFY0(dsl_dir_hold_obj(dp
, za
->za_first_integer
, NULL
, FTAG
,
541 * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and
542 * temporary datasets.
544 if (chld_dd
->dd_myname
[0] == '$' ||
545 chld_dd
->dd_myname
[0] == '%') {
546 dsl_dir_rele(chld_dd
, FTAG
);
550 my_fs_cnt
++; /* count this child */
552 dsl_dir_init_fs_ss_count(chld_dd
, tx
);
554 VERIFY0(zap_lookup(os
, chld_dd
->dd_object
,
555 DD_FIELD_FILESYSTEM_COUNT
, sizeof (count
), 1, &count
));
557 VERIFY0(zap_lookup(os
, chld_dd
->dd_object
,
558 DD_FIELD_SNAPSHOT_COUNT
, sizeof (count
), 1, &count
));
561 dsl_dir_rele(chld_dd
, FTAG
);
564 /* Count my snapshots (we counted children's snapshots above) */
565 VERIFY0(dsl_dataset_hold_obj(dd
->dd_pool
,
566 dsl_dir_phys(dd
)->dd_head_dataset_obj
, FTAG
, &ds
));
568 for (zap_cursor_init(zc
, os
, dsl_dataset_phys(ds
)->ds_snapnames_zapobj
);
569 zap_cursor_retrieve(zc
, za
) == 0;
570 zap_cursor_advance(zc
)) {
571 /* Don't count temporary snapshots */
572 if (za
->za_name
[0] != '%')
577 dsl_dataset_rele(ds
, FTAG
);
579 kmem_free(zc
, sizeof (zap_cursor_t
));
580 kmem_free(za
, sizeof (zap_attribute_t
));
582 /* we're in a sync task, update counts */
583 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
584 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_FILESYSTEM_COUNT
,
585 sizeof (my_fs_cnt
), 1, &my_fs_cnt
, tx
));
586 VERIFY0(zap_add(os
, dd
->dd_object
, DD_FIELD_SNAPSHOT_COUNT
,
587 sizeof (my_ss_cnt
), 1, &my_ss_cnt
, tx
));
591 dsl_dir_actv_fs_ss_limit_check(void *arg
, dmu_tx_t
*tx
)
593 char *ddname
= (char *)arg
;
594 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
599 error
= dsl_dataset_hold(dp
, ddname
, FTAG
, &ds
);
603 if (!spa_feature_is_enabled(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
604 dsl_dataset_rele(ds
, FTAG
);
605 return (SET_ERROR(ENOTSUP
));
609 if (spa_feature_is_active(dp
->dp_spa
, SPA_FEATURE_FS_SS_LIMIT
) &&
610 dsl_dir_is_zapified(dd
) &&
611 zap_contains(dp
->dp_meta_objset
, dd
->dd_object
,
612 DD_FIELD_FILESYSTEM_COUNT
) == 0) {
613 dsl_dataset_rele(ds
, FTAG
);
614 return (SET_ERROR(EALREADY
));
617 dsl_dataset_rele(ds
, FTAG
);
622 dsl_dir_actv_fs_ss_limit_sync(void *arg
, dmu_tx_t
*tx
)
624 char *ddname
= (char *)arg
;
625 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
629 VERIFY0(dsl_dataset_hold(dp
, ddname
, FTAG
, &ds
));
631 spa
= dsl_dataset_get_spa(ds
);
633 if (!spa_feature_is_active(spa
, SPA_FEATURE_FS_SS_LIMIT
)) {
635 * Since the feature was not active and we're now setting a
636 * limit, increment the feature-active counter so that the
637 * feature becomes active for the first time.
639 * We are already in a sync task so we can update the MOS.
641 spa_feature_incr(spa
, SPA_FEATURE_FS_SS_LIMIT
, tx
);
645 * Since we are now setting a non-UINT64_MAX limit on the filesystem,
646 * we need to ensure the counts are correct. Descend down the tree from
647 * this point and update all of the counts to be accurate.
649 dsl_dir_init_fs_ss_count(ds
->ds_dir
, tx
);
651 dsl_dataset_rele(ds
, FTAG
);
655 * Make sure the feature is enabled and activate it if necessary.
656 * Since we're setting a limit, ensure the on-disk counts are valid.
657 * This is only called by the ioctl path when setting a limit value.
659 * We do not need to validate the new limit, since users who can change the
660 * limit are also allowed to exceed the limit.
663 dsl_dir_activate_fs_ss_limit(const char *ddname
)
667 error
= dsl_sync_task(ddname
, dsl_dir_actv_fs_ss_limit_check
,
668 dsl_dir_actv_fs_ss_limit_sync
, (void *)ddname
, 0,
669 ZFS_SPACE_CHECK_RESERVED
);
671 if (error
== EALREADY
)
678 * Used to determine if the filesystem_limit or snapshot_limit should be
679 * enforced. We allow the limit to be exceeded if the user has permission to
680 * write the property value. We pass in the creds that we got in the open
681 * context since we will always be the GZ root in syncing context. We also have
682 * to handle the case where we are allowed to change the limit on the current
683 * dataset, but there may be another limit in the tree above.
685 * We can never modify these two properties within a non-global zone. In
686 * addition, the other checks are modeled on zfs_secpolicy_write_perms. We
687 * can't use that function since we are already holding the dp_config_rwlock.
688 * In addition, we already have the dd and dealing with snapshots is simplified
699 dsl_enforce_ds_ss_limits(dsl_dir_t
*dd
, zfs_prop_t prop
, cred_t
*cr
)
701 enforce_res_t enforce
= ENFORCE_ALWAYS
;
706 ASSERT(prop
== ZFS_PROP_FILESYSTEM_LIMIT
||
707 prop
== ZFS_PROP_SNAPSHOT_LIMIT
);
710 if (crgetzoneid(cr
) != GLOBAL_ZONEID
)
711 return (ENFORCE_ALWAYS
);
713 if (secpolicy_zfs(cr
) == 0)
714 return (ENFORCE_NEVER
);
717 if ((obj
= dsl_dir_phys(dd
)->dd_head_dataset_obj
) == 0)
718 return (ENFORCE_ALWAYS
);
720 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
722 if (dsl_dataset_hold_obj(dd
->dd_pool
, obj
, FTAG
, &ds
) != 0)
723 return (ENFORCE_ALWAYS
);
725 if (dsl_prop_get_ds(ds
, "zoned", 8, 1, &zoned
, NULL
) || zoned
) {
726 /* Only root can access zoned fs's from the GZ */
727 enforce
= ENFORCE_ALWAYS
;
729 if (dsl_deleg_access_impl(ds
, zfs_prop_to_name(prop
), cr
) == 0)
730 enforce
= ENFORCE_ABOVE
;
733 dsl_dataset_rele(ds
, FTAG
);
738 dsl_dir_update_last_remap_txg_sync(void *varg
, dmu_tx_t
*tx
)
740 ddulrt_arg_t
*arg
= varg
;
741 uint64_t last_remap_txg
;
742 dsl_dir_t
*dd
= arg
->ddulrta_dd
;
743 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
745 dsl_dir_zapify(dd
, tx
);
746 if (zap_lookup(mos
, dd
->dd_object
, DD_FIELD_LAST_REMAP_TXG
,
747 sizeof (last_remap_txg
), 1, &last_remap_txg
) != 0 ||
748 last_remap_txg
< arg
->ddlrta_txg
) {
749 VERIFY0(zap_update(mos
, dd
->dd_object
, DD_FIELD_LAST_REMAP_TXG
,
750 sizeof (arg
->ddlrta_txg
), 1, &arg
->ddlrta_txg
, tx
));
755 dsl_dir_update_last_remap_txg(dsl_dir_t
*dd
, uint64_t txg
)
759 arg
.ddlrta_txg
= txg
;
761 return (dsl_sync_task(spa_name(dd
->dd_pool
->dp_spa
),
762 NULL
, dsl_dir_update_last_remap_txg_sync
, &arg
,
763 1, ZFS_SPACE_CHECK_RESERVED
));
767 * Check if adding additional child filesystem(s) would exceed any filesystem
768 * limits or adding additional snapshot(s) would exceed any snapshot limits.
769 * The prop argument indicates which limit to check.
771 * Note that all filesystem limits up to the root (or the highest
772 * initialized) filesystem or the given ancestor must be satisfied.
775 dsl_fs_ss_limit_check(dsl_dir_t
*dd
, uint64_t delta
, zfs_prop_t prop
,
776 dsl_dir_t
*ancestor
, cred_t
*cr
)
778 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
779 uint64_t limit
, count
;
781 enforce_res_t enforce
;
784 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
785 ASSERT(prop
== ZFS_PROP_FILESYSTEM_LIMIT
||
786 prop
== ZFS_PROP_SNAPSHOT_LIMIT
);
789 * If we're allowed to change the limit, don't enforce the limit
790 * e.g. this can happen if a snapshot is taken by an administrative
791 * user in the global zone (i.e. a recursive snapshot by root).
792 * However, we must handle the case of delegated permissions where we
793 * are allowed to change the limit on the current dataset, but there
794 * is another limit in the tree above.
796 enforce
= dsl_enforce_ds_ss_limits(dd
, prop
, cr
);
797 if (enforce
== ENFORCE_NEVER
)
801 * e.g. if renaming a dataset with no snapshots, count adjustment
807 if (prop
== ZFS_PROP_SNAPSHOT_LIMIT
) {
809 * We don't enforce the limit for temporary snapshots. This is
810 * indicated by a NULL cred_t argument.
815 count_prop
= DD_FIELD_SNAPSHOT_COUNT
;
817 count_prop
= DD_FIELD_FILESYSTEM_COUNT
;
821 * If an ancestor has been provided, stop checking the limit once we
822 * hit that dir. We need this during rename so that we don't overcount
823 * the check once we recurse up to the common ancestor.
829 * If we hit an uninitialized node while recursing up the tree, we can
830 * stop since we know there is no limit here (or above). The counts are
831 * not valid on this node and we know we won't touch this node's counts.
833 if (!dsl_dir_is_zapified(dd
) || zap_lookup(os
, dd
->dd_object
,
834 count_prop
, sizeof (count
), 1, &count
) == ENOENT
)
837 err
= dsl_prop_get_dd(dd
, zfs_prop_to_name(prop
), 8, 1, &limit
, NULL
,
842 /* Is there a limit which we've hit? */
843 if (enforce
== ENFORCE_ALWAYS
&& (count
+ delta
) > limit
)
844 return (SET_ERROR(EDQUOT
));
846 if (dd
->dd_parent
!= NULL
)
847 err
= dsl_fs_ss_limit_check(dd
->dd_parent
, delta
, prop
,
854 * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
855 * parents. When a new filesystem/snapshot is created, increment the count on
856 * all parents, and when a filesystem/snapshot is destroyed, decrement the
860 dsl_fs_ss_count_adjust(dsl_dir_t
*dd
, int64_t delta
, const char *prop
,
864 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
867 ASSERT(dsl_pool_config_held(dd
->dd_pool
));
868 ASSERT(dmu_tx_is_syncing(tx
));
869 ASSERT(strcmp(prop
, DD_FIELD_FILESYSTEM_COUNT
) == 0 ||
870 strcmp(prop
, DD_FIELD_SNAPSHOT_COUNT
) == 0);
873 * When we receive an incremental stream into a filesystem that already
874 * exists, a temporary clone is created. We don't count this temporary
875 * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
876 * $MOS & $ORIGIN) objsets.
878 if ((dd
->dd_myname
[0] == '%' || dd
->dd_myname
[0] == '$') &&
879 strcmp(prop
, DD_FIELD_FILESYSTEM_COUNT
) == 0)
883 * e.g. if renaming a dataset with no snapshots, count adjustment is 0
889 * If we hit an uninitialized node while recursing up the tree, we can
890 * stop since we know the counts are not valid on this node and we
891 * know we shouldn't touch this node's counts. An uninitialized count
892 * on the node indicates that either the feature has not yet been
893 * activated or there are no limits on this part of the tree.
895 if (!dsl_dir_is_zapified(dd
) || (err
= zap_lookup(os
, dd
->dd_object
,
896 prop
, sizeof (count
), 1, &count
)) == ENOENT
)
901 /* Use a signed verify to make sure we're not neg. */
902 VERIFY3S(count
, >=, 0);
904 VERIFY0(zap_update(os
, dd
->dd_object
, prop
, sizeof (count
), 1, &count
,
907 /* Roll up this additional count into our ancestors */
908 if (dd
->dd_parent
!= NULL
)
909 dsl_fs_ss_count_adjust(dd
->dd_parent
, delta
, prop
, tx
);
913 dsl_dir_create_sync(dsl_pool_t
*dp
, dsl_dir_t
*pds
, const char *name
,
916 objset_t
*mos
= dp
->dp_meta_objset
;
918 dsl_dir_phys_t
*ddphys
;
921 ddobj
= dmu_object_alloc(mos
, DMU_OT_DSL_DIR
, 0,
922 DMU_OT_DSL_DIR
, sizeof (dsl_dir_phys_t
), tx
);
924 VERIFY(0 == zap_add(mos
, dsl_dir_phys(pds
)->dd_child_dir_zapobj
,
925 name
, sizeof (uint64_t), 1, &ddobj
, tx
));
927 /* it's the root dir */
928 VERIFY(0 == zap_add(mos
, DMU_POOL_DIRECTORY_OBJECT
,
929 DMU_POOL_ROOT_DATASET
, sizeof (uint64_t), 1, &ddobj
, tx
));
931 VERIFY(0 == dmu_bonus_hold(mos
, ddobj
, FTAG
, &dbuf
));
932 dmu_buf_will_dirty(dbuf
, tx
);
933 ddphys
= dbuf
->db_data
;
935 ddphys
->dd_creation_time
= gethrestime_sec();
937 ddphys
->dd_parent_obj
= pds
->dd_object
;
939 /* update the filesystem counts */
940 dsl_fs_ss_count_adjust(pds
, 1, DD_FIELD_FILESYSTEM_COUNT
, tx
);
942 ddphys
->dd_props_zapobj
= zap_create(mos
,
943 DMU_OT_DSL_PROPS
, DMU_OT_NONE
, 0, tx
);
944 ddphys
->dd_child_dir_zapobj
= zap_create(mos
,
945 DMU_OT_DSL_DIR_CHILD_MAP
, DMU_OT_NONE
, 0, tx
);
946 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_USED_BREAKDOWN
)
947 ddphys
->dd_flags
|= DD_FLAG_USED_BREAKDOWN
;
948 dmu_buf_rele(dbuf
, FTAG
);
954 dsl_dir_is_clone(dsl_dir_t
*dd
)
956 return (dsl_dir_phys(dd
)->dd_origin_obj
&&
957 (dd
->dd_pool
->dp_origin_snap
== NULL
||
958 dsl_dir_phys(dd
)->dd_origin_obj
!=
959 dd
->dd_pool
->dp_origin_snap
->ds_object
));
964 dsl_dir_get_used(dsl_dir_t
*dd
)
966 return (dsl_dir_phys(dd
)->dd_used_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_get_remaptxg(dsl_dir_t
*dd
, uint64_t *count
)
1060 if (dsl_dir_is_zapified(dd
)) {
1061 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1062 return (zap_lookup(os
, dd
->dd_object
, DD_FIELD_LAST_REMAP_TXG
,
1063 sizeof (*count
), 1, count
));
1070 dsl_dir_stats(dsl_dir_t
*dd
, nvlist_t
*nv
)
1072 mutex_enter(&dd
->dd_lock
);
1073 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_QUOTA
,
1074 dsl_dir_get_quota(dd
));
1075 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_RESERVATION
,
1076 dsl_dir_get_reservation(dd
));
1077 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_LOGICALUSED
,
1078 dsl_dir_get_logicalused(dd
));
1079 if (dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
1080 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDSNAP
,
1081 dsl_dir_get_usedsnap(dd
));
1082 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDDS
,
1083 dsl_dir_get_usedds(dd
));
1084 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDREFRESERV
,
1085 dsl_dir_get_usedrefreserv(dd
));
1086 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_USEDCHILD
,
1087 dsl_dir_get_usedchild(dd
));
1089 mutex_exit(&dd
->dd_lock
);
1092 if (dsl_dir_get_filesystem_count(dd
, &count
) == 0) {
1093 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_FILESYSTEM_COUNT
,
1096 if (dsl_dir_get_snapshot_count(dd
, &count
) == 0) {
1097 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_SNAPSHOT_COUNT
,
1100 if (dsl_dir_get_remaptxg(dd
, &count
) == 0) {
1101 dsl_prop_nvlist_add_uint64(nv
, ZFS_PROP_REMAPTXG
,
1105 if (dsl_dir_is_clone(dd
)) {
1106 char buf
[ZFS_MAX_DATASET_NAME_LEN
];
1107 dsl_dir_get_origin(dd
, buf
);
1108 dsl_prop_nvlist_add_string(nv
, ZFS_PROP_ORIGIN
, buf
);
1114 dsl_dir_dirty(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
1116 dsl_pool_t
*dp
= dd
->dd_pool
;
1118 ASSERT(dsl_dir_phys(dd
));
1120 if (txg_list_add(&dp
->dp_dirty_dirs
, dd
, tx
->tx_txg
)) {
1121 /* up the hold count until we can be written out */
1122 dmu_buf_add_ref(dd
->dd_dbuf
, dd
);
1127 parent_delta(dsl_dir_t
*dd
, uint64_t used
, int64_t delta
)
1129 uint64_t old_accounted
= MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1130 uint64_t new_accounted
=
1131 MAX(used
+ delta
, dsl_dir_phys(dd
)->dd_reserved
);
1132 return (new_accounted
- old_accounted
);
1136 dsl_dir_sync(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
1138 ASSERT(dmu_tx_is_syncing(tx
));
1140 mutex_enter(&dd
->dd_lock
);
1141 ASSERT0(dd
->dd_tempreserved
[tx
->tx_txg
&TXG_MASK
]);
1142 dprintf_dd(dd
, "txg=%llu towrite=%lluK\n", tx
->tx_txg
,
1143 dd
->dd_space_towrite
[tx
->tx_txg
&TXG_MASK
] / 1024);
1144 dd
->dd_space_towrite
[tx
->tx_txg
&TXG_MASK
] = 0;
1145 mutex_exit(&dd
->dd_lock
);
1147 /* release the hold from dsl_dir_dirty */
1148 dmu_buf_rele(dd
->dd_dbuf
, dd
);
1152 dsl_dir_space_towrite(dsl_dir_t
*dd
)
1156 ASSERT(MUTEX_HELD(&dd
->dd_lock
));
1158 for (int i
= 0; i
< TXG_SIZE
; i
++) {
1159 space
+= dd
->dd_space_towrite
[i
& TXG_MASK
];
1160 ASSERT3U(dd
->dd_space_towrite
[i
& TXG_MASK
], >=, 0);
1166 * How much space would dd have available if ancestor had delta applied
1167 * to it? If ondiskonly is set, we're only interested in what's
1168 * on-disk, not estimated pending changes.
1171 dsl_dir_space_available(dsl_dir_t
*dd
,
1172 dsl_dir_t
*ancestor
, int64_t delta
, int ondiskonly
)
1174 uint64_t parentspace
, myspace
, quota
, used
;
1177 * If there are no restrictions otherwise, assume we have
1178 * unlimited space available.
1181 parentspace
= UINT64_MAX
;
1183 if (dd
->dd_parent
!= NULL
) {
1184 parentspace
= dsl_dir_space_available(dd
->dd_parent
,
1185 ancestor
, delta
, ondiskonly
);
1188 mutex_enter(&dd
->dd_lock
);
1189 if (dsl_dir_phys(dd
)->dd_quota
!= 0)
1190 quota
= dsl_dir_phys(dd
)->dd_quota
;
1191 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1193 used
+= dsl_dir_space_towrite(dd
);
1195 if (dd
->dd_parent
== NULL
) {
1196 uint64_t poolsize
= dsl_pool_adjustedsize(dd
->dd_pool
, FALSE
);
1197 quota
= MIN(quota
, poolsize
);
1200 if (dsl_dir_phys(dd
)->dd_reserved
> used
&& parentspace
!= UINT64_MAX
) {
1202 * We have some space reserved, in addition to what our
1205 parentspace
+= dsl_dir_phys(dd
)->dd_reserved
- used
;
1208 if (dd
== ancestor
) {
1210 ASSERT(used
>= -delta
);
1212 if (parentspace
!= UINT64_MAX
)
1213 parentspace
-= delta
;
1221 * the lesser of the space provided by our parent and
1222 * the space left in our quota
1224 myspace
= MIN(parentspace
, quota
- used
);
1227 mutex_exit(&dd
->dd_lock
);
1232 struct tempreserve
{
1233 list_node_t tr_node
;
1239 dsl_dir_tempreserve_impl(dsl_dir_t
*dd
, uint64_t asize
, boolean_t netfree
,
1240 boolean_t ignorequota
, list_t
*tr_list
,
1241 dmu_tx_t
*tx
, boolean_t first
)
1243 uint64_t txg
= tx
->tx_txg
;
1245 struct tempreserve
*tr
;
1246 int retval
= EDQUOT
;
1247 uint64_t ref_rsrv
= 0;
1249 ASSERT3U(txg
, !=, 0);
1250 ASSERT3S(asize
, >, 0);
1252 mutex_enter(&dd
->dd_lock
);
1255 * Check against the dsl_dir's quota. We don't add in the delta
1256 * when checking for over-quota because they get one free hit.
1258 uint64_t est_inflight
= dsl_dir_space_towrite(dd
);
1259 for (int i
= 0; i
< TXG_SIZE
; i
++)
1260 est_inflight
+= dd
->dd_tempreserved
[i
];
1261 uint64_t used_on_disk
= dsl_dir_phys(dd
)->dd_used_bytes
;
1264 * On the first iteration, fetch the dataset's used-on-disk and
1265 * refreservation values. Also, if checkrefquota is set, test if
1266 * allocating this space would exceed the dataset's refquota.
1268 if (first
&& tx
->tx_objset
) {
1270 dsl_dataset_t
*ds
= tx
->tx_objset
->os_dsl_dataset
;
1272 error
= dsl_dataset_check_quota(ds
, !netfree
,
1273 asize
, est_inflight
, &used_on_disk
, &ref_rsrv
);
1275 mutex_exit(&dd
->dd_lock
);
1281 * If this transaction will result in a net free of space,
1282 * we want to let it through.
1284 if (ignorequota
|| netfree
|| dsl_dir_phys(dd
)->dd_quota
== 0)
1287 quota
= dsl_dir_phys(dd
)->dd_quota
;
1290 * Adjust the quota against the actual pool size at the root
1291 * minus any outstanding deferred frees.
1292 * To ensure that it's possible to remove files from a full
1293 * pool without inducing transient overcommits, we throttle
1294 * netfree transactions against a quota that is slightly larger,
1295 * but still within the pool's allocation slop. In cases where
1296 * we're very close to full, this will allow a steady trickle of
1297 * removes to get through.
1299 uint64_t deferred
= 0;
1300 if (dd
->dd_parent
== NULL
) {
1301 spa_t
*spa
= dd
->dd_pool
->dp_spa
;
1302 uint64_t poolsize
= dsl_pool_adjustedsize(dd
->dd_pool
, netfree
);
1303 deferred
= metaslab_class_get_deferred(spa_normal_class(spa
));
1304 if (poolsize
- deferred
< quota
) {
1305 quota
= poolsize
- deferred
;
1311 * If they are requesting more space, and our current estimate
1312 * is over quota, they get to try again unless the actual
1313 * on-disk is over quota and there are no pending changes (which
1314 * may free up space for us).
1316 if (used_on_disk
+ est_inflight
>= quota
) {
1317 if (est_inflight
> 0 || used_on_disk
< quota
||
1318 (retval
== ENOSPC
&& used_on_disk
< quota
+ deferred
))
1320 dprintf_dd(dd
, "failing: used=%lluK inflight = %lluK "
1321 "quota=%lluK tr=%lluK err=%d\n",
1322 used_on_disk
>>10, est_inflight
>>10,
1323 quota
>>10, asize
>>10, retval
);
1324 mutex_exit(&dd
->dd_lock
);
1325 return (SET_ERROR(retval
));
1328 /* We need to up our estimated delta before dropping dd_lock */
1329 dd
->dd_tempreserved
[txg
& TXG_MASK
] += asize
;
1331 uint64_t parent_rsrv
= parent_delta(dd
, used_on_disk
+ est_inflight
,
1333 mutex_exit(&dd
->dd_lock
);
1335 tr
= kmem_zalloc(sizeof (struct tempreserve
), KM_SLEEP
);
1337 tr
->tr_size
= asize
;
1338 list_insert_tail(tr_list
, tr
);
1340 /* see if it's OK with our parent */
1341 if (dd
->dd_parent
!= NULL
&& parent_rsrv
!= 0) {
1342 boolean_t ismos
= (dsl_dir_phys(dd
)->dd_head_dataset_obj
== 0);
1344 return (dsl_dir_tempreserve_impl(dd
->dd_parent
,
1345 parent_rsrv
, netfree
, ismos
, tr_list
, tx
, B_FALSE
));
1352 * Reserve space in this dsl_dir, to be used in this tx's txg.
1353 * After the space has been dirtied (and dsl_dir_willuse_space()
1354 * has been called), the reservation should be canceled, using
1355 * dsl_dir_tempreserve_clear().
1358 dsl_dir_tempreserve_space(dsl_dir_t
*dd
, uint64_t lsize
, uint64_t asize
,
1359 boolean_t netfree
, void **tr_cookiep
, dmu_tx_t
*tx
)
1369 tr_list
= kmem_alloc(sizeof (list_t
), KM_SLEEP
);
1370 list_create(tr_list
, sizeof (struct tempreserve
),
1371 offsetof(struct tempreserve
, tr_node
));
1372 ASSERT3S(asize
, >, 0);
1374 err
= arc_tempreserve_space(lsize
, tx
->tx_txg
);
1376 struct tempreserve
*tr
;
1378 tr
= kmem_zalloc(sizeof (struct tempreserve
), KM_SLEEP
);
1379 tr
->tr_size
= lsize
;
1380 list_insert_tail(tr_list
, tr
);
1382 if (err
== EAGAIN
) {
1384 * If arc_memory_throttle() detected that pageout
1385 * is running and we are low on memory, we delay new
1386 * non-pageout transactions to give pageout an
1389 * It is unfortunate to be delaying while the caller's
1392 txg_delay(dd
->dd_pool
, tx
->tx_txg
,
1393 MSEC2NSEC(10), MSEC2NSEC(10));
1394 err
= SET_ERROR(ERESTART
);
1399 err
= dsl_dir_tempreserve_impl(dd
, asize
, netfree
,
1400 B_FALSE
, tr_list
, tx
, B_TRUE
);
1404 dsl_dir_tempreserve_clear(tr_list
, tx
);
1406 *tr_cookiep
= tr_list
;
1412 * Clear a temporary reservation that we previously made with
1413 * dsl_dir_tempreserve_space().
1416 dsl_dir_tempreserve_clear(void *tr_cookie
, dmu_tx_t
*tx
)
1418 int txgidx
= tx
->tx_txg
& TXG_MASK
;
1419 list_t
*tr_list
= tr_cookie
;
1420 struct tempreserve
*tr
;
1422 ASSERT3U(tx
->tx_txg
, !=, 0);
1424 if (tr_cookie
== NULL
)
1427 while ((tr
= list_head(tr_list
)) != NULL
) {
1429 mutex_enter(&tr
->tr_ds
->dd_lock
);
1430 ASSERT3U(tr
->tr_ds
->dd_tempreserved
[txgidx
], >=,
1432 tr
->tr_ds
->dd_tempreserved
[txgidx
] -= tr
->tr_size
;
1433 mutex_exit(&tr
->tr_ds
->dd_lock
);
1435 arc_tempreserve_clear(tr
->tr_size
);
1437 list_remove(tr_list
, tr
);
1438 kmem_free(tr
, sizeof (struct tempreserve
));
1441 kmem_free(tr_list
, sizeof (list_t
));
1445 * This should be called from open context when we think we're going to write
1446 * or free space, for example when dirtying data. Be conservative; it's okay
1447 * to write less space or free more, but we don't want to write more or free
1448 * less than the amount specified.
1451 dsl_dir_willuse_space(dsl_dir_t
*dd
, int64_t space
, dmu_tx_t
*tx
)
1453 int64_t parent_space
;
1456 mutex_enter(&dd
->dd_lock
);
1458 dd
->dd_space_towrite
[tx
->tx_txg
& TXG_MASK
] += space
;
1460 est_used
= dsl_dir_space_towrite(dd
) + dsl_dir_phys(dd
)->dd_used_bytes
;
1461 parent_space
= parent_delta(dd
, est_used
, space
);
1462 mutex_exit(&dd
->dd_lock
);
1464 /* Make sure that we clean up dd_space_to* */
1465 dsl_dir_dirty(dd
, tx
);
1467 /* XXX this is potentially expensive and unnecessary... */
1468 if (parent_space
&& dd
->dd_parent
)
1469 dsl_dir_willuse_space(dd
->dd_parent
, parent_space
, tx
);
1472 /* call from syncing context when we actually write/free space for this dd */
1474 dsl_dir_diduse_space(dsl_dir_t
*dd
, dd_used_t type
,
1475 int64_t used
, int64_t compressed
, int64_t uncompressed
, dmu_tx_t
*tx
)
1477 int64_t accounted_delta
;
1480 * dsl_dataset_set_refreservation_sync_impl() calls this with
1481 * dd_lock held, so that it can atomically update
1482 * ds->ds_reserved and the dsl_dir accounting, so that
1483 * dsl_dataset_check_quota() can see dataset and dir accounting
1486 boolean_t needlock
= !MUTEX_HELD(&dd
->dd_lock
);
1488 ASSERT(dmu_tx_is_syncing(tx
));
1489 ASSERT(type
< DD_USED_NUM
);
1491 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1494 mutex_enter(&dd
->dd_lock
);
1496 parent_delta(dd
, dsl_dir_phys(dd
)->dd_used_bytes
, used
);
1497 ASSERT(used
>= 0 || dsl_dir_phys(dd
)->dd_used_bytes
>= -used
);
1498 ASSERT(compressed
>= 0 ||
1499 dsl_dir_phys(dd
)->dd_compressed_bytes
>= -compressed
);
1500 ASSERT(uncompressed
>= 0 ||
1501 dsl_dir_phys(dd
)->dd_uncompressed_bytes
>= -uncompressed
);
1502 dsl_dir_phys(dd
)->dd_used_bytes
+= used
;
1503 dsl_dir_phys(dd
)->dd_uncompressed_bytes
+= uncompressed
;
1504 dsl_dir_phys(dd
)->dd_compressed_bytes
+= compressed
;
1506 if (dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
) {
1508 dsl_dir_phys(dd
)->dd_used_breakdown
[type
] >= -used
);
1509 dsl_dir_phys(dd
)->dd_used_breakdown
[type
] += used
;
1513 for (t
= 0; t
< DD_USED_NUM
; t
++)
1514 u
+= dsl_dir_phys(dd
)->dd_used_breakdown
[t
];
1515 ASSERT3U(u
, ==, dsl_dir_phys(dd
)->dd_used_bytes
);
1519 mutex_exit(&dd
->dd_lock
);
1521 if (dd
->dd_parent
!= NULL
) {
1522 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD
,
1523 accounted_delta
, compressed
, uncompressed
, tx
);
1524 dsl_dir_transfer_space(dd
->dd_parent
,
1525 used
- accounted_delta
,
1526 DD_USED_CHILD_RSRV
, DD_USED_CHILD
, tx
);
1531 dsl_dir_transfer_space(dsl_dir_t
*dd
, int64_t delta
,
1532 dd_used_t oldtype
, dd_used_t newtype
, dmu_tx_t
*tx
)
1534 ASSERT(dmu_tx_is_syncing(tx
));
1535 ASSERT(oldtype
< DD_USED_NUM
);
1536 ASSERT(newtype
< DD_USED_NUM
);
1539 !(dsl_dir_phys(dd
)->dd_flags
& DD_FLAG_USED_BREAKDOWN
))
1542 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1543 mutex_enter(&dd
->dd_lock
);
1545 dsl_dir_phys(dd
)->dd_used_breakdown
[oldtype
] >= delta
:
1546 dsl_dir_phys(dd
)->dd_used_breakdown
[newtype
] >= -delta
);
1547 ASSERT(dsl_dir_phys(dd
)->dd_used_bytes
>= ABS(delta
));
1548 dsl_dir_phys(dd
)->dd_used_breakdown
[oldtype
] -= delta
;
1549 dsl_dir_phys(dd
)->dd_used_breakdown
[newtype
] += delta
;
1550 mutex_exit(&dd
->dd_lock
);
1553 typedef struct dsl_dir_set_qr_arg
{
1554 const char *ddsqra_name
;
1555 zprop_source_t ddsqra_source
;
1556 uint64_t ddsqra_value
;
1557 } dsl_dir_set_qr_arg_t
;
1560 dsl_dir_set_quota_check(void *arg
, dmu_tx_t
*tx
)
1562 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1563 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1566 uint64_t towrite
, newval
;
1568 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
1572 error
= dsl_prop_predict(ds
->ds_dir
, "quota",
1573 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
1575 dsl_dataset_rele(ds
, FTAG
);
1580 dsl_dataset_rele(ds
, FTAG
);
1584 mutex_enter(&ds
->ds_dir
->dd_lock
);
1586 * If we are doing the preliminary check in open context, and
1587 * there are pending changes, then don't fail it, since the
1588 * pending changes could under-estimate the amount of space to be
1591 towrite
= dsl_dir_space_towrite(ds
->ds_dir
);
1592 if ((dmu_tx_is_syncing(tx
) || towrite
== 0) &&
1593 (newval
< dsl_dir_phys(ds
->ds_dir
)->dd_reserved
||
1594 newval
< dsl_dir_phys(ds
->ds_dir
)->dd_used_bytes
+ towrite
)) {
1595 error
= SET_ERROR(ENOSPC
);
1597 mutex_exit(&ds
->ds_dir
->dd_lock
);
1598 dsl_dataset_rele(ds
, FTAG
);
1603 dsl_dir_set_quota_sync(void *arg
, dmu_tx_t
*tx
)
1605 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1606 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1610 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
1612 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_RECVD_PROPS
) {
1613 dsl_prop_set_sync_impl(ds
, zfs_prop_to_name(ZFS_PROP_QUOTA
),
1614 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
1615 &ddsqra
->ddsqra_value
, tx
);
1617 VERIFY0(dsl_prop_get_int_ds(ds
,
1618 zfs_prop_to_name(ZFS_PROP_QUOTA
), &newval
));
1620 newval
= ddsqra
->ddsqra_value
;
1621 spa_history_log_internal_ds(ds
, "set", tx
, "%s=%lld",
1622 zfs_prop_to_name(ZFS_PROP_QUOTA
), (longlong_t
)newval
);
1625 dmu_buf_will_dirty(ds
->ds_dir
->dd_dbuf
, tx
);
1626 mutex_enter(&ds
->ds_dir
->dd_lock
);
1627 dsl_dir_phys(ds
->ds_dir
)->dd_quota
= newval
;
1628 mutex_exit(&ds
->ds_dir
->dd_lock
);
1629 dsl_dataset_rele(ds
, FTAG
);
1633 dsl_dir_set_quota(const char *ddname
, zprop_source_t source
, uint64_t quota
)
1635 dsl_dir_set_qr_arg_t ddsqra
;
1637 ddsqra
.ddsqra_name
= ddname
;
1638 ddsqra
.ddsqra_source
= source
;
1639 ddsqra
.ddsqra_value
= quota
;
1641 return (dsl_sync_task(ddname
, dsl_dir_set_quota_check
,
1642 dsl_dir_set_quota_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
1646 dsl_dir_set_reservation_check(void *arg
, dmu_tx_t
*tx
)
1648 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1649 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1652 uint64_t newval
, used
, avail
;
1655 error
= dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
);
1661 * If we are doing the preliminary check in open context, the
1662 * space estimates may be inaccurate.
1664 if (!dmu_tx_is_syncing(tx
)) {
1665 dsl_dataset_rele(ds
, FTAG
);
1669 error
= dsl_prop_predict(ds
->ds_dir
,
1670 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1671 ddsqra
->ddsqra_source
, ddsqra
->ddsqra_value
, &newval
);
1673 dsl_dataset_rele(ds
, FTAG
);
1677 mutex_enter(&dd
->dd_lock
);
1678 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1679 mutex_exit(&dd
->dd_lock
);
1681 if (dd
->dd_parent
) {
1682 avail
= dsl_dir_space_available(dd
->dd_parent
,
1685 avail
= dsl_pool_adjustedsize(dd
->dd_pool
, B_FALSE
) - used
;
1688 if (MAX(used
, newval
) > MAX(used
, dsl_dir_phys(dd
)->dd_reserved
)) {
1689 uint64_t delta
= MAX(used
, newval
) -
1690 MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1692 if (delta
> avail
||
1693 (dsl_dir_phys(dd
)->dd_quota
> 0 &&
1694 newval
> dsl_dir_phys(dd
)->dd_quota
))
1695 error
= SET_ERROR(ENOSPC
);
1698 dsl_dataset_rele(ds
, FTAG
);
1703 dsl_dir_set_reservation_sync_impl(dsl_dir_t
*dd
, uint64_t value
, dmu_tx_t
*tx
)
1708 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
1710 mutex_enter(&dd
->dd_lock
);
1711 used
= dsl_dir_phys(dd
)->dd_used_bytes
;
1712 delta
= MAX(used
, value
) - MAX(used
, dsl_dir_phys(dd
)->dd_reserved
);
1713 dsl_dir_phys(dd
)->dd_reserved
= value
;
1715 if (dd
->dd_parent
!= NULL
) {
1716 /* Roll up this additional usage into our ancestors */
1717 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD_RSRV
,
1720 mutex_exit(&dd
->dd_lock
);
1725 dsl_dir_set_reservation_sync(void *arg
, dmu_tx_t
*tx
)
1727 dsl_dir_set_qr_arg_t
*ddsqra
= arg
;
1728 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1732 VERIFY0(dsl_dataset_hold(dp
, ddsqra
->ddsqra_name
, FTAG
, &ds
));
1734 if (spa_version(dp
->dp_spa
) >= SPA_VERSION_RECVD_PROPS
) {
1735 dsl_prop_set_sync_impl(ds
,
1736 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1737 ddsqra
->ddsqra_source
, sizeof (ddsqra
->ddsqra_value
), 1,
1738 &ddsqra
->ddsqra_value
, tx
);
1740 VERIFY0(dsl_prop_get_int_ds(ds
,
1741 zfs_prop_to_name(ZFS_PROP_RESERVATION
), &newval
));
1743 newval
= ddsqra
->ddsqra_value
;
1744 spa_history_log_internal_ds(ds
, "set", tx
, "%s=%lld",
1745 zfs_prop_to_name(ZFS_PROP_RESERVATION
),
1746 (longlong_t
)newval
);
1749 dsl_dir_set_reservation_sync_impl(ds
->ds_dir
, newval
, tx
);
1750 dsl_dataset_rele(ds
, FTAG
);
1754 dsl_dir_set_reservation(const char *ddname
, zprop_source_t source
,
1755 uint64_t reservation
)
1757 dsl_dir_set_qr_arg_t ddsqra
;
1759 ddsqra
.ddsqra_name
= ddname
;
1760 ddsqra
.ddsqra_source
= source
;
1761 ddsqra
.ddsqra_value
= reservation
;
1763 return (dsl_sync_task(ddname
, dsl_dir_set_reservation_check
,
1764 dsl_dir_set_reservation_sync
, &ddsqra
, 0, ZFS_SPACE_CHECK_NONE
));
1768 closest_common_ancestor(dsl_dir_t
*ds1
, dsl_dir_t
*ds2
)
1770 for (; ds1
; ds1
= ds1
->dd_parent
) {
1772 for (dd
= ds2
; dd
; dd
= dd
->dd_parent
) {
1781 * If delta is applied to dd, how much of that delta would be applied to
1782 * ancestor? Syncing context only.
1785 would_change(dsl_dir_t
*dd
, int64_t delta
, dsl_dir_t
*ancestor
)
1790 mutex_enter(&dd
->dd_lock
);
1791 delta
= parent_delta(dd
, dsl_dir_phys(dd
)->dd_used_bytes
, delta
);
1792 mutex_exit(&dd
->dd_lock
);
1793 return (would_change(dd
->dd_parent
, delta
, ancestor
));
1796 typedef struct dsl_dir_rename_arg
{
1797 const char *ddra_oldname
;
1798 const char *ddra_newname
;
1800 } dsl_dir_rename_arg_t
;
1804 dsl_valid_rename(dsl_pool_t
*dp
, dsl_dataset_t
*ds
, void *arg
)
1807 char namebuf
[ZFS_MAX_DATASET_NAME_LEN
];
1809 dsl_dataset_name(ds
, namebuf
);
1811 if (strlen(namebuf
) + *deltap
>= ZFS_MAX_DATASET_NAME_LEN
)
1812 return (SET_ERROR(ENAMETOOLONG
));
1817 dsl_dir_rename_check(void *arg
, dmu_tx_t
*tx
)
1819 dsl_dir_rename_arg_t
*ddra
= arg
;
1820 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1821 dsl_dir_t
*dd
, *newparent
;
1822 const char *mynewname
;
1824 int delta
= strlen(ddra
->ddra_newname
) - strlen(ddra
->ddra_oldname
);
1826 /* target dir should exist */
1827 error
= dsl_dir_hold(dp
, ddra
->ddra_oldname
, FTAG
, &dd
, NULL
);
1831 /* new parent should exist */
1832 error
= dsl_dir_hold(dp
, ddra
->ddra_newname
, FTAG
,
1833 &newparent
, &mynewname
);
1835 dsl_dir_rele(dd
, FTAG
);
1839 /* can't rename to different pool */
1840 if (dd
->dd_pool
!= newparent
->dd_pool
) {
1841 dsl_dir_rele(newparent
, FTAG
);
1842 dsl_dir_rele(dd
, FTAG
);
1843 return (SET_ERROR(ENXIO
));
1846 /* new name should not already exist */
1847 if (mynewname
== NULL
) {
1848 dsl_dir_rele(newparent
, FTAG
);
1849 dsl_dir_rele(dd
, FTAG
);
1850 return (SET_ERROR(EEXIST
));
1853 /* if the name length is growing, validate child name lengths */
1855 error
= dmu_objset_find_dp(dp
, dd
->dd_object
, dsl_valid_rename
,
1856 &delta
, DS_FIND_CHILDREN
| DS_FIND_SNAPSHOTS
);
1858 dsl_dir_rele(newparent
, FTAG
);
1859 dsl_dir_rele(dd
, FTAG
);
1864 if (dmu_tx_is_syncing(tx
)) {
1865 if (spa_feature_is_active(dp
->dp_spa
,
1866 SPA_FEATURE_FS_SS_LIMIT
)) {
1868 * Although this is the check function and we don't
1869 * normally make on-disk changes in check functions,
1870 * we need to do that here.
1872 * Ensure this portion of the tree's counts have been
1873 * initialized in case the new parent has limits set.
1875 dsl_dir_init_fs_ss_count(dd
, tx
);
1879 if (newparent
!= dd
->dd_parent
) {
1880 /* is there enough space? */
1882 MAX(dsl_dir_phys(dd
)->dd_used_bytes
,
1883 dsl_dir_phys(dd
)->dd_reserved
);
1884 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1885 uint64_t fs_cnt
= 0;
1886 uint64_t ss_cnt
= 0;
1888 if (dsl_dir_is_zapified(dd
)) {
1891 err
= zap_lookup(os
, dd
->dd_object
,
1892 DD_FIELD_FILESYSTEM_COUNT
, sizeof (fs_cnt
), 1,
1894 if (err
!= ENOENT
&& err
!= 0) {
1895 dsl_dir_rele(newparent
, FTAG
);
1896 dsl_dir_rele(dd
, FTAG
);
1901 * have to add 1 for the filesystem itself that we're
1906 err
= zap_lookup(os
, dd
->dd_object
,
1907 DD_FIELD_SNAPSHOT_COUNT
, sizeof (ss_cnt
), 1,
1909 if (err
!= ENOENT
&& err
!= 0) {
1910 dsl_dir_rele(newparent
, FTAG
);
1911 dsl_dir_rele(dd
, FTAG
);
1916 /* no rename into our descendant */
1917 if (closest_common_ancestor(dd
, newparent
) == dd
) {
1918 dsl_dir_rele(newparent
, FTAG
);
1919 dsl_dir_rele(dd
, FTAG
);
1920 return (SET_ERROR(EINVAL
));
1923 error
= dsl_dir_transfer_possible(dd
->dd_parent
,
1924 newparent
, fs_cnt
, ss_cnt
, myspace
, ddra
->ddra_cred
);
1926 dsl_dir_rele(newparent
, FTAG
);
1927 dsl_dir_rele(dd
, FTAG
);
1932 dsl_dir_rele(newparent
, FTAG
);
1933 dsl_dir_rele(dd
, FTAG
);
1938 dsl_dir_rename_sync(void *arg
, dmu_tx_t
*tx
)
1940 dsl_dir_rename_arg_t
*ddra
= arg
;
1941 dsl_pool_t
*dp
= dmu_tx_pool(tx
);
1942 dsl_dir_t
*dd
, *newparent
;
1943 const char *mynewname
;
1945 objset_t
*mos
= dp
->dp_meta_objset
;
1947 VERIFY0(dsl_dir_hold(dp
, ddra
->ddra_oldname
, FTAG
, &dd
, NULL
));
1948 VERIFY0(dsl_dir_hold(dp
, ddra
->ddra_newname
, FTAG
, &newparent
,
1951 /* Log this before we change the name. */
1952 spa_history_log_internal_dd(dd
, "rename", tx
,
1953 "-> %s", ddra
->ddra_newname
);
1955 if (newparent
!= dd
->dd_parent
) {
1956 objset_t
*os
= dd
->dd_pool
->dp_meta_objset
;
1957 uint64_t fs_cnt
= 0;
1958 uint64_t ss_cnt
= 0;
1961 * We already made sure the dd counts were initialized in the
1964 if (spa_feature_is_active(dp
->dp_spa
,
1965 SPA_FEATURE_FS_SS_LIMIT
)) {
1966 VERIFY0(zap_lookup(os
, dd
->dd_object
,
1967 DD_FIELD_FILESYSTEM_COUNT
, sizeof (fs_cnt
), 1,
1969 /* add 1 for the filesystem itself that we're moving */
1972 VERIFY0(zap_lookup(os
, dd
->dd_object
,
1973 DD_FIELD_SNAPSHOT_COUNT
, sizeof (ss_cnt
), 1,
1977 dsl_fs_ss_count_adjust(dd
->dd_parent
, -fs_cnt
,
1978 DD_FIELD_FILESYSTEM_COUNT
, tx
);
1979 dsl_fs_ss_count_adjust(newparent
, fs_cnt
,
1980 DD_FIELD_FILESYSTEM_COUNT
, tx
);
1982 dsl_fs_ss_count_adjust(dd
->dd_parent
, -ss_cnt
,
1983 DD_FIELD_SNAPSHOT_COUNT
, tx
);
1984 dsl_fs_ss_count_adjust(newparent
, ss_cnt
,
1985 DD_FIELD_SNAPSHOT_COUNT
, tx
);
1987 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD
,
1988 -dsl_dir_phys(dd
)->dd_used_bytes
,
1989 -dsl_dir_phys(dd
)->dd_compressed_bytes
,
1990 -dsl_dir_phys(dd
)->dd_uncompressed_bytes
, tx
);
1991 dsl_dir_diduse_space(newparent
, DD_USED_CHILD
,
1992 dsl_dir_phys(dd
)->dd_used_bytes
,
1993 dsl_dir_phys(dd
)->dd_compressed_bytes
,
1994 dsl_dir_phys(dd
)->dd_uncompressed_bytes
, tx
);
1996 if (dsl_dir_phys(dd
)->dd_reserved
>
1997 dsl_dir_phys(dd
)->dd_used_bytes
) {
1998 uint64_t unused_rsrv
= dsl_dir_phys(dd
)->dd_reserved
-
1999 dsl_dir_phys(dd
)->dd_used_bytes
;
2001 dsl_dir_diduse_space(dd
->dd_parent
, DD_USED_CHILD_RSRV
,
2002 -unused_rsrv
, 0, 0, tx
);
2003 dsl_dir_diduse_space(newparent
, DD_USED_CHILD_RSRV
,
2004 unused_rsrv
, 0, 0, tx
);
2008 dmu_buf_will_dirty(dd
->dd_dbuf
, tx
);
2010 /* remove from old parent zapobj */
2011 error
= zap_remove(mos
,
2012 dsl_dir_phys(dd
->dd_parent
)->dd_child_dir_zapobj
,
2016 (void) strcpy(dd
->dd_myname
, mynewname
);
2017 dsl_dir_rele(dd
->dd_parent
, dd
);
2018 dsl_dir_phys(dd
)->dd_parent_obj
= newparent
->dd_object
;
2019 VERIFY0(dsl_dir_hold_obj(dp
,
2020 newparent
->dd_object
, NULL
, dd
, &dd
->dd_parent
));
2022 /* add to new parent zapobj */
2023 VERIFY0(zap_add(mos
, dsl_dir_phys(newparent
)->dd_child_dir_zapobj
,
2024 dd
->dd_myname
, 8, 1, &dd
->dd_object
, tx
));
2026 dsl_prop_notify_all(dd
);
2028 dsl_dir_rele(newparent
, FTAG
);
2029 dsl_dir_rele(dd
, FTAG
);
2033 dsl_dir_rename(const char *oldname
, const char *newname
)
2035 dsl_dir_rename_arg_t ddra
;
2037 ddra
.ddra_oldname
= oldname
;
2038 ddra
.ddra_newname
= newname
;
2039 ddra
.ddra_cred
= CRED();
2041 return (dsl_sync_task(oldname
,
2042 dsl_dir_rename_check
, dsl_dir_rename_sync
, &ddra
,
2043 3, ZFS_SPACE_CHECK_RESERVED
));
2047 dsl_dir_transfer_possible(dsl_dir_t
*sdd
, dsl_dir_t
*tdd
,
2048 uint64_t fs_cnt
, uint64_t ss_cnt
, uint64_t space
, cred_t
*cr
)
2050 dsl_dir_t
*ancestor
;
2055 ancestor
= closest_common_ancestor(sdd
, tdd
);
2056 adelta
= would_change(sdd
, -space
, ancestor
);
2057 avail
= dsl_dir_space_available(tdd
, ancestor
, adelta
, FALSE
);
2059 return (SET_ERROR(ENOSPC
));
2061 err
= dsl_fs_ss_limit_check(tdd
, fs_cnt
, ZFS_PROP_FILESYSTEM_LIMIT
,
2065 err
= dsl_fs_ss_limit_check(tdd
, ss_cnt
, ZFS_PROP_SNAPSHOT_LIMIT
,
2074 dsl_dir_snap_cmtime(dsl_dir_t
*dd
)
2078 mutex_enter(&dd
->dd_lock
);
2079 t
= dd
->dd_snap_cmtime
;
2080 mutex_exit(&dd
->dd_lock
);
2086 dsl_dir_snap_cmtime_update(dsl_dir_t
*dd
)
2091 mutex_enter(&dd
->dd_lock
);
2092 dd
->dd_snap_cmtime
= t
;
2093 mutex_exit(&dd
->dd_lock
);
2097 dsl_dir_zapify(dsl_dir_t
*dd
, dmu_tx_t
*tx
)
2099 objset_t
*mos
= dd
->dd_pool
->dp_meta_objset
;
2100 dmu_object_zapify(mos
, dd
->dd_object
, DMU_OT_DSL_DIR
, tx
);
2104 dsl_dir_is_zapified(dsl_dir_t
*dd
)
2106 dmu_object_info_t doi
;
2108 dmu_object_info_from_db(dd
->dd_dbuf
, &doi
);
2109 return (doi
.doi_type
== DMU_OTN_ZAP_METADATA
);