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) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
24 * All rights reserved.
25 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
26 * Copyright (c) 2014 Joyent, Inc. All rights reserved.
27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
28 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
32 #include <sys/dmu_objset.h>
33 #include <sys/dmu_tx.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_dir.h>
36 #include <sys/dsl_prop.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/dsl_deleg.h>
39 #include <sys/dmu_impl.h>
41 #include <sys/metaslab.h>
45 #include <sys/sunddi.h>
48 #include <sys/zfs_vfsops.h>
50 #include <sys/zfeature.h>
51 #include <sys/policy.h>
52 #include <sys/zfs_znode.h>
53 #include "zfs_namecheck.h"
57 * Filesystem and Snapshot Limits
58 * ------------------------------
60 * These limits are used to restrict the number of filesystems and/or snapshots
61 * that can be created at a given level in the tree or below. A typical
62 * use-case is with a delegated dataset where the administrator wants to ensure
63 * that a user within the zone is not creating too many additional filesystems
64 * or snapshots, even though they're not exceeding their space quota.
66 * The filesystem and snapshot counts are stored as extensible properties. This
67 * capability is controlled by a feature flag and must be enabled to be used.
68 * Once enabled, the feature is not active until the first limit is set. At
69 * that point, future operations to create/destroy filesystems or snapshots
70 * will validate and update the counts.
72 * Because the count properties will not exist before the feature is active,
73 * the counts are updated when a limit is first set on an uninitialized
74 * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
75 * all of the nested filesystems/snapshots. Thus, a new leaf node has a
76 * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
77 * snapshot count properties on a node indicate uninitialized counts on that
78 * node.) When first setting a limit on an uninitialized node, the code starts
79 * at the filesystem with the new limit and descends into all sub-filesystems
80 * to add the count properties.
82 * In practice this is lightweight since a limit is typically set when the
83 * filesystem is created and thus has no children. Once valid, changing the
84 * limit value won't require a re-traversal since the counts are already valid.
85 * When recursively fixing the counts, if a node with a limit is encountered
86 * during the descent, the counts are known to be valid and there is no need to
87 * descend into that filesystem's children. The counts on filesystems above the
88 * one with the new limit will still be uninitialized, unless a limit is
89 * eventually set on one of those filesystems. The counts are always recursively
90 * updated when a limit is set on a dataset, unless there is already a limit.
91 * When a new limit value is set on a filesystem with an existing limit, it is
92 * possible for the new limit to be less than the current count at that level
93 * since a user who can change the limit is also allowed to exceed the limit.
95 * Once the feature is active, then whenever a filesystem or snapshot is
96 * created, the code recurses up the tree, validating the new count against the
97 * limit at each initialized level. In practice, most levels will not have a
98 * limit set. If there is a limit at any initialized level up the tree, the
99 * check must pass or the creation will fail. Likewise, when a filesystem or
100 * snapshot is destroyed, the counts are recursively adjusted all the way up
101 * the initizized nodes in the tree. Renaming a filesystem into different point
102 * in the tree will first validate, then update the counts on each branch up to
103 * the common ancestor. A receive will also validate the counts and then update
106 * An exception to the above behavior is that the limit is not enforced if the
107 * user has permission to modify the limit. This is primarily so that
108 * recursive snapshots in the global zone always work. We want to prevent a
109 * denial-of-service in which a lower level delegated dataset could max out its
110 * limit and thus block recursive snapshots from being taken in the global zone.
111 * Because of this, it is possible for the snapshot count to be over the limit
112 * and snapshots taken in the global zone could cause a lower level dataset to
113 * hit or exceed its limit. The administrator taking the global zone recursive
114 * snapshot should be aware of this side-effect and behave accordingly.
115 * For consistency, the filesystem limit is also not enforced if the user can
118 * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
119 * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
120 * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
121 * dsl_dir_init_fs_ss_count().
123 * There is a special case when we receive a filesystem that already exists. In
124 * this case a temporary clone name of %X is created (see dmu_recv_begin). We
125 * never update the filesystem counts for temporary clones.
127 * Likewise, we do not update the snapshot counts for temporary snapshots,
128 * such as those created by zfs diff.
131 extern inline dsl_dir_phys_t *dsl_dir_phys(dsl_dir_t *dd);
133 static uint64_t dsl_dir_space_towrite(dsl_dir_t *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);
713 if (crgetzoneid(cr) != GLOBAL_ZONEID)
715 return (ENFORCE_ALWAYS);
717 if (secpolicy_zfs(cr) == 0)
718 return (ENFORCE_NEVER);
721 if ((obj = dsl_dir_phys(dd)->dd_head_dataset_obj) == 0)
722 return (ENFORCE_ALWAYS);
724 ASSERT(dsl_pool_config_held(dd->dd_pool));
726 if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0)
727 return (ENFORCE_ALWAYS);
729 if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL) || zoned) {
730 /* Only root can access zoned fs's from the GZ */
731 enforce = ENFORCE_ALWAYS;
733 if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0)
734 enforce = ENFORCE_ABOVE;
737 dsl_dataset_rele(ds, FTAG);
742 * Check if adding additional child filesystem(s) would exceed any filesystem
743 * limits or adding additional snapshot(s) would exceed any snapshot limits.
744 * The prop argument indicates which limit to check.
746 * Note that all filesystem limits up to the root (or the highest
747 * initialized) filesystem or the given ancestor must be satisfied.
750 dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop,
751 dsl_dir_t *ancestor, cred_t *cr)
753 objset_t *os = dd->dd_pool->dp_meta_objset;
754 uint64_t limit, count;
756 enforce_res_t enforce;
759 ASSERT(dsl_pool_config_held(dd->dd_pool));
760 ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
761 prop == ZFS_PROP_SNAPSHOT_LIMIT);
764 * If we're allowed to change the limit, don't enforce the limit
765 * e.g. this can happen if a snapshot is taken by an administrative
766 * user in the global zone (i.e. a recursive snapshot by root).
767 * However, we must handle the case of delegated permissions where we
768 * are allowed to change the limit on the current dataset, but there
769 * is another limit in the tree above.
771 enforce = dsl_enforce_ds_ss_limits(dd, prop, cr);
772 if (enforce == ENFORCE_NEVER)
776 * e.g. if renaming a dataset with no snapshots, count adjustment
782 if (prop == ZFS_PROP_SNAPSHOT_LIMIT) {
784 * We don't enforce the limit for temporary snapshots. This is
785 * indicated by a NULL cred_t argument.
790 count_prop = DD_FIELD_SNAPSHOT_COUNT;
792 count_prop = DD_FIELD_FILESYSTEM_COUNT;
796 * If an ancestor has been provided, stop checking the limit once we
797 * hit that dir. We need this during rename so that we don't overcount
798 * the check once we recurse up to the common ancestor.
804 * If we hit an uninitialized node while recursing up the tree, we can
805 * stop since we know there is no limit here (or above). The counts are
806 * not valid on this node and we know we won't touch this node's counts.
808 if (!dsl_dir_is_zapified(dd) || zap_lookup(os, dd->dd_object,
809 count_prop, sizeof (count), 1, &count) == ENOENT)
812 err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL,
817 /* Is there a limit which we've hit? */
818 if (enforce == ENFORCE_ALWAYS && (count + delta) > limit)
819 return (SET_ERROR(EDQUOT));
821 if (dd->dd_parent != NULL)
822 err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop,
829 * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
830 * parents. When a new filesystem/snapshot is created, increment the count on
831 * all parents, and when a filesystem/snapshot is destroyed, decrement the
835 dsl_fs_ss_count_adjust(dsl_dir_t *dd, int64_t delta, const char *prop,
839 objset_t *os = dd->dd_pool->dp_meta_objset;
842 ASSERT(dsl_pool_config_held(dd->dd_pool));
843 ASSERT(dmu_tx_is_syncing(tx));
844 ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 ||
845 strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0);
848 * When we receive an incremental stream into a filesystem that already
849 * exists, a temporary clone is created. We don't count this temporary
850 * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
851 * $MOS & $ORIGIN) objsets.
853 if ((dd->dd_myname[0] == '%' || dd->dd_myname[0] == '$') &&
854 strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0)
858 * e.g. if renaming a dataset with no snapshots, count adjustment is 0
864 * If we hit an uninitialized node while recursing up the tree, we can
865 * stop since we know the counts are not valid on this node and we
866 * know we shouldn't touch this node's counts. An uninitialized count
867 * on the node indicates that either the feature has not yet been
868 * activated or there are no limits on this part of the tree.
870 if (!dsl_dir_is_zapified(dd) || (err = zap_lookup(os, dd->dd_object,
871 prop, sizeof (count), 1, &count)) == ENOENT)
876 /* Use a signed verify to make sure we're not neg. */
877 VERIFY3S(count, >=, 0);
879 VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count,
882 /* Roll up this additional count into our ancestors */
883 if (dd->dd_parent != NULL)
884 dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx);
888 dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
891 objset_t *mos = dp->dp_meta_objset;
893 dsl_dir_phys_t *ddphys;
896 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
897 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
899 VERIFY(0 == zap_add(mos, dsl_dir_phys(pds)->dd_child_dir_zapobj,
900 name, sizeof (uint64_t), 1, &ddobj, tx));
902 /* it's the root dir */
903 VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
904 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
906 VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
907 dmu_buf_will_dirty(dbuf, tx);
908 ddphys = dbuf->db_data;
910 ddphys->dd_creation_time = gethrestime_sec();
912 ddphys->dd_parent_obj = pds->dd_object;
914 /* update the filesystem counts */
915 dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx);
917 ddphys->dd_props_zapobj = zap_create(mos,
918 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
919 ddphys->dd_child_dir_zapobj = zap_create(mos,
920 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
921 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
922 ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
923 dmu_buf_rele(dbuf, FTAG);
929 dsl_dir_is_clone(dsl_dir_t *dd)
931 return (dsl_dir_phys(dd)->dd_origin_obj &&
932 (dd->dd_pool->dp_origin_snap == NULL ||
933 dsl_dir_phys(dd)->dd_origin_obj !=
934 dd->dd_pool->dp_origin_snap->ds_object));
939 dsl_dir_get_used(dsl_dir_t *dd)
941 return (dsl_dir_phys(dd)->dd_used_bytes);
945 dsl_dir_get_quota(dsl_dir_t *dd)
947 return (dsl_dir_phys(dd)->dd_quota);
951 dsl_dir_get_reservation(dsl_dir_t *dd)
953 return (dsl_dir_phys(dd)->dd_reserved);
957 dsl_dir_get_compressratio(dsl_dir_t *dd)
959 /* a fixed point number, 100x the ratio */
960 return (dsl_dir_phys(dd)->dd_compressed_bytes == 0 ? 100 :
961 (dsl_dir_phys(dd)->dd_uncompressed_bytes * 100 /
962 dsl_dir_phys(dd)->dd_compressed_bytes));
966 dsl_dir_get_logicalused(dsl_dir_t *dd)
968 return (dsl_dir_phys(dd)->dd_uncompressed_bytes);
972 dsl_dir_get_usedsnap(dsl_dir_t *dd)
974 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]);
978 dsl_dir_get_usedds(dsl_dir_t *dd)
980 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_HEAD]);
984 dsl_dir_get_usedrefreserv(dsl_dir_t *dd)
986 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_REFRSRV]);
990 dsl_dir_get_usedchild(dsl_dir_t *dd)
992 return (dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD] +
993 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD_RSRV]);
997 dsl_dir_get_origin(dsl_dir_t *dd, char *buf)
1000 VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
1001 dsl_dir_phys(dd)->dd_origin_obj, FTAG, &ds));
1003 dsl_dataset_name(ds, buf);
1005 dsl_dataset_rele(ds, FTAG);
1009 dsl_dir_get_filesystem_count(dsl_dir_t *dd, uint64_t *count)
1011 if (dsl_dir_is_zapified(dd)) {
1012 objset_t *os = dd->dd_pool->dp_meta_objset;
1013 return (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
1014 sizeof (*count), 1, count));
1021 dsl_dir_get_snapshot_count(dsl_dir_t *dd, uint64_t *count)
1023 if (dsl_dir_is_zapified(dd)) {
1024 objset_t *os = dd->dd_pool->dp_meta_objset;
1025 return (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
1026 sizeof (*count), 1, count));
1033 dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
1035 mutex_enter(&dd->dd_lock);
1036 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA,
1037 dsl_dir_get_quota(dd));
1038 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
1039 dsl_dir_get_reservation(dd));
1040 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED,
1041 dsl_dir_get_logicalused(dd));
1042 if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
1043 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
1044 dsl_dir_get_usedsnap(dd));
1045 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
1046 dsl_dir_get_usedds(dd));
1047 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
1048 dsl_dir_get_usedrefreserv(dd));
1049 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
1050 dsl_dir_get_usedchild(dd));
1052 mutex_exit(&dd->dd_lock);
1055 if (dsl_dir_get_filesystem_count(dd, &count) == 0) {
1056 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_FILESYSTEM_COUNT,
1059 if (dsl_dir_get_snapshot_count(dd, &count) == 0) {
1060 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_SNAPSHOT_COUNT,
1064 if (dsl_dir_is_clone(dd)) {
1065 char buf[ZFS_MAX_DATASET_NAME_LEN];
1066 dsl_dir_get_origin(dd, buf);
1067 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
1073 dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
1075 dsl_pool_t *dp = dd->dd_pool;
1077 ASSERT(dsl_dir_phys(dd));
1079 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) {
1080 /* up the hold count until we can be written out */
1081 dmu_buf_add_ref(dd->dd_dbuf, dd);
1086 parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
1088 uint64_t old_accounted = MAX(used, dsl_dir_phys(dd)->dd_reserved);
1089 uint64_t new_accounted =
1090 MAX(used + delta, dsl_dir_phys(dd)->dd_reserved);
1091 return (new_accounted - old_accounted);
1095 dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
1097 ASSERT(dmu_tx_is_syncing(tx));
1099 mutex_enter(&dd->dd_lock);
1100 ASSERT0(dd->dd_tempreserved[tx->tx_txg&TXG_MASK]);
1101 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
1102 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
1103 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
1104 mutex_exit(&dd->dd_lock);
1106 /* release the hold from dsl_dir_dirty */
1107 dmu_buf_rele(dd->dd_dbuf, dd);
1111 dsl_dir_space_towrite(dsl_dir_t *dd)
1115 ASSERT(MUTEX_HELD(&dd->dd_lock));
1117 for (int i = 0; i < TXG_SIZE; i++) {
1118 space += dd->dd_space_towrite[i & TXG_MASK];
1119 ASSERT3U(dd->dd_space_towrite[i & TXG_MASK], >=, 0);
1125 * How much space would dd have available if ancestor had delta applied
1126 * to it? If ondiskonly is set, we're only interested in what's
1127 * on-disk, not estimated pending changes.
1130 dsl_dir_space_available(dsl_dir_t *dd,
1131 dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
1133 uint64_t parentspace, myspace, quota, used;
1136 * If there are no restrictions otherwise, assume we have
1137 * unlimited space available.
1140 parentspace = UINT64_MAX;
1142 if (dd->dd_parent != NULL) {
1143 parentspace = dsl_dir_space_available(dd->dd_parent,
1144 ancestor, delta, ondiskonly);
1147 mutex_enter(&dd->dd_lock);
1148 if (dsl_dir_phys(dd)->dd_quota != 0)
1149 quota = dsl_dir_phys(dd)->dd_quota;
1150 used = dsl_dir_phys(dd)->dd_used_bytes;
1152 used += dsl_dir_space_towrite(dd);
1154 if (dd->dd_parent == NULL) {
1155 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE);
1156 quota = MIN(quota, poolsize);
1159 if (dsl_dir_phys(dd)->dd_reserved > used && parentspace != UINT64_MAX) {
1161 * We have some space reserved, in addition to what our
1164 parentspace += dsl_dir_phys(dd)->dd_reserved - used;
1167 if (dd == ancestor) {
1169 ASSERT(used >= -delta);
1171 if (parentspace != UINT64_MAX)
1172 parentspace -= delta;
1180 * the lesser of the space provided by our parent and
1181 * the space left in our quota
1183 myspace = MIN(parentspace, quota - used);
1186 mutex_exit(&dd->dd_lock);
1191 struct tempreserve {
1192 list_node_t tr_node;
1198 dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
1199 boolean_t ignorequota, list_t *tr_list,
1200 dmu_tx_t *tx, boolean_t first)
1202 uint64_t txg = tx->tx_txg;
1204 struct tempreserve *tr;
1205 int retval = EDQUOT;
1206 uint64_t ref_rsrv = 0;
1208 ASSERT3U(txg, !=, 0);
1209 ASSERT3S(asize, >, 0);
1211 mutex_enter(&dd->dd_lock);
1214 * Check against the dsl_dir's quota. We don't add in the delta
1215 * when checking for over-quota because they get one free hit.
1217 uint64_t est_inflight = dsl_dir_space_towrite(dd);
1218 for (int i = 0; i < TXG_SIZE; i++)
1219 est_inflight += dd->dd_tempreserved[i];
1220 uint64_t used_on_disk = dsl_dir_phys(dd)->dd_used_bytes;
1223 * On the first iteration, fetch the dataset's used-on-disk and
1224 * refreservation values. Also, if checkrefquota is set, test if
1225 * allocating this space would exceed the dataset's refquota.
1227 if (first && tx->tx_objset) {
1229 dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
1231 error = dsl_dataset_check_quota(ds, !netfree,
1232 asize, est_inflight, &used_on_disk, &ref_rsrv);
1234 mutex_exit(&dd->dd_lock);
1240 * If this transaction will result in a net free of space,
1241 * we want to let it through.
1243 if (ignorequota || netfree || dsl_dir_phys(dd)->dd_quota == 0)
1246 quota = dsl_dir_phys(dd)->dd_quota;
1249 * Adjust the quota against the actual pool size at the root
1250 * minus any outstanding deferred frees.
1251 * To ensure that it's possible to remove files from a full
1252 * pool without inducing transient overcommits, we throttle
1253 * netfree transactions against a quota that is slightly larger,
1254 * but still within the pool's allocation slop. In cases where
1255 * we're very close to full, this will allow a steady trickle of
1256 * removes to get through.
1258 uint64_t deferred = 0;
1259 if (dd->dd_parent == NULL) {
1260 spa_t *spa = dd->dd_pool->dp_spa;
1261 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
1262 deferred = metaslab_class_get_deferred(spa_normal_class(spa));
1263 if (poolsize - deferred < quota) {
1264 quota = poolsize - deferred;
1270 * If they are requesting more space, and our current estimate
1271 * is over quota, they get to try again unless the actual
1272 * on-disk is over quota and there are no pending changes (which
1273 * may free up space for us).
1275 if (used_on_disk + est_inflight >= quota) {
1276 if (est_inflight > 0 || used_on_disk < quota ||
1277 (retval == ENOSPC && used_on_disk < quota + deferred))
1279 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
1280 "quota=%lluK tr=%lluK err=%d\n",
1281 used_on_disk>>10, est_inflight>>10,
1282 quota>>10, asize>>10, retval);
1283 mutex_exit(&dd->dd_lock);
1284 return (SET_ERROR(retval));
1287 /* We need to up our estimated delta before dropping dd_lock */
1288 dd->dd_tempreserved[txg & TXG_MASK] += asize;
1290 uint64_t parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
1292 mutex_exit(&dd->dd_lock);
1294 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
1296 tr->tr_size = asize;
1297 list_insert_tail(tr_list, tr);
1299 /* see if it's OK with our parent */
1300 if (dd->dd_parent != NULL && parent_rsrv != 0) {
1301 boolean_t ismos = (dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
1303 return (dsl_dir_tempreserve_impl(dd->dd_parent,
1304 parent_rsrv, netfree, ismos, tr_list, tx, B_FALSE));
1311 * Reserve space in this dsl_dir, to be used in this tx's txg.
1312 * After the space has been dirtied (and dsl_dir_willuse_space()
1313 * has been called), the reservation should be canceled, using
1314 * dsl_dir_tempreserve_clear().
1317 dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
1318 boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx)
1328 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
1329 list_create(tr_list, sizeof (struct tempreserve),
1330 offsetof(struct tempreserve, tr_node));
1331 ASSERT3S(asize, >, 0);
1333 err = arc_tempreserve_space(lsize, tx->tx_txg);
1335 struct tempreserve *tr;
1337 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
1338 tr->tr_size = lsize;
1339 list_insert_tail(tr_list, tr);
1341 if (err == EAGAIN) {
1343 * If arc_memory_throttle() detected that pageout
1344 * is running and we are low on memory, we delay new
1345 * non-pageout transactions to give pageout an
1348 * It is unfortunate to be delaying while the caller's
1351 txg_delay(dd->dd_pool, tx->tx_txg,
1352 MSEC2NSEC(10), MSEC2NSEC(10));
1353 err = SET_ERROR(ERESTART);
1358 err = dsl_dir_tempreserve_impl(dd, asize, netfree,
1359 B_FALSE, tr_list, tx, B_TRUE);
1363 dsl_dir_tempreserve_clear(tr_list, tx);
1365 *tr_cookiep = tr_list;
1371 * Clear a temporary reservation that we previously made with
1372 * dsl_dir_tempreserve_space().
1375 dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
1377 int txgidx = tx->tx_txg & TXG_MASK;
1378 list_t *tr_list = tr_cookie;
1379 struct tempreserve *tr;
1381 ASSERT3U(tx->tx_txg, !=, 0);
1383 if (tr_cookie == NULL)
1386 while ((tr = list_head(tr_list)) != NULL) {
1388 mutex_enter(&tr->tr_ds->dd_lock);
1389 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
1391 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
1392 mutex_exit(&tr->tr_ds->dd_lock);
1394 arc_tempreserve_clear(tr->tr_size);
1396 list_remove(tr_list, tr);
1397 kmem_free(tr, sizeof (struct tempreserve));
1400 kmem_free(tr_list, sizeof (list_t));
1404 * This should be called from open context when we think we're going to write
1405 * or free space, for example when dirtying data. Be conservative; it's okay
1406 * to write less space or free more, but we don't want to write more or free
1407 * less than the amount specified.
1410 dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
1412 int64_t parent_space;
1415 mutex_enter(&dd->dd_lock);
1417 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
1419 est_used = dsl_dir_space_towrite(dd) + dsl_dir_phys(dd)->dd_used_bytes;
1420 parent_space = parent_delta(dd, est_used, space);
1421 mutex_exit(&dd->dd_lock);
1423 /* Make sure that we clean up dd_space_to* */
1424 dsl_dir_dirty(dd, tx);
1426 /* XXX this is potentially expensive and unnecessary... */
1427 if (parent_space && dd->dd_parent)
1428 dsl_dir_willuse_space(dd->dd_parent, parent_space, tx);
1431 /* call from syncing context when we actually write/free space for this dd */
1433 dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
1434 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
1436 int64_t accounted_delta;
1439 * dsl_dataset_set_refreservation_sync_impl() calls this with
1440 * dd_lock held, so that it can atomically update
1441 * ds->ds_reserved and the dsl_dir accounting, so that
1442 * dsl_dataset_check_quota() can see dataset and dir accounting
1445 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
1447 ASSERT(dmu_tx_is_syncing(tx));
1448 ASSERT(type < DD_USED_NUM);
1450 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1453 mutex_enter(&dd->dd_lock);
1455 parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, used);
1456 ASSERT(used >= 0 || dsl_dir_phys(dd)->dd_used_bytes >= -used);
1457 ASSERT(compressed >= 0 ||
1458 dsl_dir_phys(dd)->dd_compressed_bytes >= -compressed);
1459 ASSERT(uncompressed >= 0 ||
1460 dsl_dir_phys(dd)->dd_uncompressed_bytes >= -uncompressed);
1461 dsl_dir_phys(dd)->dd_used_bytes += used;
1462 dsl_dir_phys(dd)->dd_uncompressed_bytes += uncompressed;
1463 dsl_dir_phys(dd)->dd_compressed_bytes += compressed;
1465 if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
1467 dsl_dir_phys(dd)->dd_used_breakdown[type] >= -used);
1468 dsl_dir_phys(dd)->dd_used_breakdown[type] += used;
1472 for (t = 0; t < DD_USED_NUM; t++)
1473 u += dsl_dir_phys(dd)->dd_used_breakdown[t];
1474 ASSERT3U(u, ==, dsl_dir_phys(dd)->dd_used_bytes);
1478 mutex_exit(&dd->dd_lock);
1480 if (dd->dd_parent != NULL) {
1481 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
1482 accounted_delta, compressed, uncompressed, tx);
1483 dsl_dir_transfer_space(dd->dd_parent,
1484 used - accounted_delta,
1485 DD_USED_CHILD_RSRV, DD_USED_CHILD, NULL);
1490 dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
1491 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
1493 ASSERT(tx == NULL || dmu_tx_is_syncing(tx));
1494 ASSERT(oldtype < DD_USED_NUM);
1495 ASSERT(newtype < DD_USED_NUM);
1498 !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN))
1502 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1503 mutex_enter(&dd->dd_lock);
1505 dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta :
1506 dsl_dir_phys(dd)->dd_used_breakdown[newtype] >= -delta);
1507 ASSERT(dsl_dir_phys(dd)->dd_used_bytes >= ABS(delta));
1508 dsl_dir_phys(dd)->dd_used_breakdown[oldtype] -= delta;
1509 dsl_dir_phys(dd)->dd_used_breakdown[newtype] += delta;
1510 mutex_exit(&dd->dd_lock);
1513 typedef struct dsl_dir_set_qr_arg {
1514 const char *ddsqra_name;
1515 zprop_source_t ddsqra_source;
1516 uint64_t ddsqra_value;
1517 } dsl_dir_set_qr_arg_t;
1520 dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx)
1522 dsl_dir_set_qr_arg_t *ddsqra = arg;
1523 dsl_pool_t *dp = dmu_tx_pool(tx);
1526 uint64_t towrite, newval;
1528 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
1532 error = dsl_prop_predict(ds->ds_dir, "quota",
1533 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
1535 dsl_dataset_rele(ds, FTAG);
1540 dsl_dataset_rele(ds, FTAG);
1544 mutex_enter(&ds->ds_dir->dd_lock);
1546 * If we are doing the preliminary check in open context, and
1547 * there are pending changes, then don't fail it, since the
1548 * pending changes could under-estimate the amount of space to be
1551 towrite = dsl_dir_space_towrite(ds->ds_dir);
1552 if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
1553 (newval < dsl_dir_phys(ds->ds_dir)->dd_reserved ||
1554 newval < dsl_dir_phys(ds->ds_dir)->dd_used_bytes + towrite)) {
1555 error = SET_ERROR(ENOSPC);
1557 mutex_exit(&ds->ds_dir->dd_lock);
1558 dsl_dataset_rele(ds, FTAG);
1563 dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx)
1565 dsl_dir_set_qr_arg_t *ddsqra = arg;
1566 dsl_pool_t *dp = dmu_tx_pool(tx);
1570 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
1572 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
1573 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA),
1574 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
1575 &ddsqra->ddsqra_value, tx);
1577 VERIFY0(dsl_prop_get_int_ds(ds,
1578 zfs_prop_to_name(ZFS_PROP_QUOTA), &newval));
1580 newval = ddsqra->ddsqra_value;
1581 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
1582 zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval);
1585 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
1586 mutex_enter(&ds->ds_dir->dd_lock);
1587 dsl_dir_phys(ds->ds_dir)->dd_quota = newval;
1588 mutex_exit(&ds->ds_dir->dd_lock);
1589 dsl_dataset_rele(ds, FTAG);
1593 dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
1595 dsl_dir_set_qr_arg_t ddsqra;
1597 ddsqra.ddsqra_name = ddname;
1598 ddsqra.ddsqra_source = source;
1599 ddsqra.ddsqra_value = quota;
1601 return (dsl_sync_task(ddname, dsl_dir_set_quota_check,
1602 dsl_dir_set_quota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
1606 dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx)
1608 dsl_dir_set_qr_arg_t *ddsqra = arg;
1609 dsl_pool_t *dp = dmu_tx_pool(tx);
1612 uint64_t newval, used, avail;
1615 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
1621 * If we are doing the preliminary check in open context, the
1622 * space estimates may be inaccurate.
1624 if (!dmu_tx_is_syncing(tx)) {
1625 dsl_dataset_rele(ds, FTAG);
1629 error = dsl_prop_predict(ds->ds_dir,
1630 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1631 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
1633 dsl_dataset_rele(ds, FTAG);
1637 mutex_enter(&dd->dd_lock);
1638 used = dsl_dir_phys(dd)->dd_used_bytes;
1639 mutex_exit(&dd->dd_lock);
1641 if (dd->dd_parent) {
1642 avail = dsl_dir_space_available(dd->dd_parent,
1645 avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
1648 if (MAX(used, newval) > MAX(used, dsl_dir_phys(dd)->dd_reserved)) {
1649 uint64_t delta = MAX(used, newval) -
1650 MAX(used, dsl_dir_phys(dd)->dd_reserved);
1652 if (delta > avail ||
1653 (dsl_dir_phys(dd)->dd_quota > 0 &&
1654 newval > dsl_dir_phys(dd)->dd_quota))
1655 error = SET_ERROR(ENOSPC);
1658 dsl_dataset_rele(ds, FTAG);
1663 dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx)
1668 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1670 mutex_enter(&dd->dd_lock);
1671 used = dsl_dir_phys(dd)->dd_used_bytes;
1672 delta = MAX(used, value) - MAX(used, dsl_dir_phys(dd)->dd_reserved);
1673 dsl_dir_phys(dd)->dd_reserved = value;
1675 if (dd->dd_parent != NULL) {
1676 /* Roll up this additional usage into our ancestors */
1677 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1680 mutex_exit(&dd->dd_lock);
1684 dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx)
1686 dsl_dir_set_qr_arg_t *ddsqra = arg;
1687 dsl_pool_t *dp = dmu_tx_pool(tx);
1691 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
1693 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
1694 dsl_prop_set_sync_impl(ds,
1695 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1696 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
1697 &ddsqra->ddsqra_value, tx);
1699 VERIFY0(dsl_prop_get_int_ds(ds,
1700 zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval));
1702 newval = ddsqra->ddsqra_value;
1703 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
1704 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1705 (longlong_t)newval);
1708 dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx);
1709 dsl_dataset_rele(ds, FTAG);
1713 dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
1714 uint64_t reservation)
1716 dsl_dir_set_qr_arg_t ddsqra;
1718 ddsqra.ddsqra_name = ddname;
1719 ddsqra.ddsqra_source = source;
1720 ddsqra.ddsqra_value = reservation;
1722 return (dsl_sync_task(ddname, dsl_dir_set_reservation_check,
1723 dsl_dir_set_reservation_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
1727 closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
1729 for (; ds1; ds1 = ds1->dd_parent) {
1731 for (dd = ds2; dd; dd = dd->dd_parent) {
1740 * If delta is applied to dd, how much of that delta would be applied to
1741 * ancestor? Syncing context only.
1744 would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
1749 mutex_enter(&dd->dd_lock);
1750 delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, delta);
1751 mutex_exit(&dd->dd_lock);
1752 return (would_change(dd->dd_parent, delta, ancestor));
1755 typedef struct dsl_dir_rename_arg {
1756 const char *ddra_oldname;
1757 const char *ddra_newname;
1759 } dsl_dir_rename_arg_t;
1763 dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
1766 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
1768 dsl_dataset_name(ds, namebuf);
1770 if (strlen(namebuf) + *deltap >= ZFS_MAX_DATASET_NAME_LEN)
1771 return (SET_ERROR(ENAMETOOLONG));
1776 dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
1778 dsl_dir_rename_arg_t *ddra = arg;
1779 dsl_pool_t *dp = dmu_tx_pool(tx);
1780 dsl_dir_t *dd, *newparent;
1781 const char *mynewname;
1783 int delta = strlen(ddra->ddra_newname) - strlen(ddra->ddra_oldname);
1785 /* target dir should exist */
1786 error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL);
1790 /* new parent should exist */
1791 error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG,
1792 &newparent, &mynewname);
1794 dsl_dir_rele(dd, FTAG);
1798 /* can't rename to different pool */
1799 if (dd->dd_pool != newparent->dd_pool) {
1800 dsl_dir_rele(newparent, FTAG);
1801 dsl_dir_rele(dd, FTAG);
1802 return (SET_ERROR(EXDEV));
1805 /* new name should not already exist */
1806 if (mynewname == NULL) {
1807 dsl_dir_rele(newparent, FTAG);
1808 dsl_dir_rele(dd, FTAG);
1809 return (SET_ERROR(EEXIST));
1812 /* if the name length is growing, validate child name lengths */
1814 error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename,
1815 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
1817 dsl_dir_rele(newparent, FTAG);
1818 dsl_dir_rele(dd, FTAG);
1823 if (dmu_tx_is_syncing(tx)) {
1824 if (spa_feature_is_active(dp->dp_spa,
1825 SPA_FEATURE_FS_SS_LIMIT)) {
1827 * Although this is the check function and we don't
1828 * normally make on-disk changes in check functions,
1829 * we need to do that here.
1831 * Ensure this portion of the tree's counts have been
1832 * initialized in case the new parent has limits set.
1834 dsl_dir_init_fs_ss_count(dd, tx);
1838 if (newparent != dd->dd_parent) {
1839 /* is there enough space? */
1841 MAX(dsl_dir_phys(dd)->dd_used_bytes,
1842 dsl_dir_phys(dd)->dd_reserved);
1843 objset_t *os = dd->dd_pool->dp_meta_objset;
1844 uint64_t fs_cnt = 0;
1845 uint64_t ss_cnt = 0;
1847 if (dsl_dir_is_zapified(dd)) {
1850 err = zap_lookup(os, dd->dd_object,
1851 DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
1853 if (err != ENOENT && err != 0) {
1854 dsl_dir_rele(newparent, FTAG);
1855 dsl_dir_rele(dd, FTAG);
1860 * have to add 1 for the filesystem itself that we're
1865 err = zap_lookup(os, dd->dd_object,
1866 DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
1868 if (err != ENOENT && err != 0) {
1869 dsl_dir_rele(newparent, FTAG);
1870 dsl_dir_rele(dd, FTAG);
1875 /* no rename into our descendant */
1876 if (closest_common_ancestor(dd, newparent) == dd) {
1877 dsl_dir_rele(newparent, FTAG);
1878 dsl_dir_rele(dd, FTAG);
1879 return (SET_ERROR(EINVAL));
1882 error = dsl_dir_transfer_possible(dd->dd_parent,
1883 newparent, fs_cnt, ss_cnt, myspace, ddra->ddra_cred);
1885 dsl_dir_rele(newparent, FTAG);
1886 dsl_dir_rele(dd, FTAG);
1891 dsl_dir_rele(newparent, FTAG);
1892 dsl_dir_rele(dd, FTAG);
1897 dsl_dir_rename_sync(void *arg, dmu_tx_t *tx)
1899 dsl_dir_rename_arg_t *ddra = arg;
1900 dsl_pool_t *dp = dmu_tx_pool(tx);
1901 dsl_dir_t *dd, *newparent;
1902 const char *mynewname;
1904 objset_t *mos = dp->dp_meta_objset;
1906 VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL));
1907 VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent,
1910 /* Log this before we change the name. */
1911 spa_history_log_internal_dd(dd, "rename", tx,
1912 "-> %s", ddra->ddra_newname);
1914 if (newparent != dd->dd_parent) {
1915 objset_t *os = dd->dd_pool->dp_meta_objset;
1916 uint64_t fs_cnt = 0;
1917 uint64_t ss_cnt = 0;
1920 * We already made sure the dd counts were initialized in the
1923 if (spa_feature_is_active(dp->dp_spa,
1924 SPA_FEATURE_FS_SS_LIMIT)) {
1925 VERIFY0(zap_lookup(os, dd->dd_object,
1926 DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
1928 /* add 1 for the filesystem itself that we're moving */
1931 VERIFY0(zap_lookup(os, dd->dd_object,
1932 DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
1936 dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt,
1937 DD_FIELD_FILESYSTEM_COUNT, tx);
1938 dsl_fs_ss_count_adjust(newparent, fs_cnt,
1939 DD_FIELD_FILESYSTEM_COUNT, tx);
1941 dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt,
1942 DD_FIELD_SNAPSHOT_COUNT, tx);
1943 dsl_fs_ss_count_adjust(newparent, ss_cnt,
1944 DD_FIELD_SNAPSHOT_COUNT, tx);
1946 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
1947 -dsl_dir_phys(dd)->dd_used_bytes,
1948 -dsl_dir_phys(dd)->dd_compressed_bytes,
1949 -dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
1950 dsl_dir_diduse_space(newparent, DD_USED_CHILD,
1951 dsl_dir_phys(dd)->dd_used_bytes,
1952 dsl_dir_phys(dd)->dd_compressed_bytes,
1953 dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
1955 if (dsl_dir_phys(dd)->dd_reserved >
1956 dsl_dir_phys(dd)->dd_used_bytes) {
1957 uint64_t unused_rsrv = dsl_dir_phys(dd)->dd_reserved -
1958 dsl_dir_phys(dd)->dd_used_bytes;
1960 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1961 -unused_rsrv, 0, 0, tx);
1962 dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV,
1963 unused_rsrv, 0, 0, tx);
1967 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1969 /* remove from old parent zapobj */
1970 error = zap_remove(mos,
1971 dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj,
1975 (void) strcpy(dd->dd_myname, mynewname);
1976 dsl_dir_rele(dd->dd_parent, dd);
1977 dsl_dir_phys(dd)->dd_parent_obj = newparent->dd_object;
1978 VERIFY0(dsl_dir_hold_obj(dp,
1979 newparent->dd_object, NULL, dd, &dd->dd_parent));
1981 /* add to new parent zapobj */
1982 VERIFY0(zap_add(mos, dsl_dir_phys(newparent)->dd_child_dir_zapobj,
1983 dd->dd_myname, 8, 1, &dd->dd_object, tx));
1987 zfsvfs_update_fromname(ddra->ddra_oldname, ddra->ddra_newname);
1988 zvol_rename_minors(ddra->ddra_oldname, ddra->ddra_newname);
1992 dsl_prop_notify_all(dd);
1994 dsl_dir_rele(newparent, FTAG);
1995 dsl_dir_rele(dd, FTAG);
1999 dsl_dir_rename(const char *oldname, const char *newname)
2001 dsl_dir_rename_arg_t ddra;
2003 ddra.ddra_oldname = oldname;
2004 ddra.ddra_newname = newname;
2005 ddra.ddra_cred = CRED();
2007 return (dsl_sync_task(oldname,
2008 dsl_dir_rename_check, dsl_dir_rename_sync, &ddra,
2009 3, ZFS_SPACE_CHECK_RESERVED));
2013 dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
2014 uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *cr)
2016 dsl_dir_t *ancestor;
2021 ancestor = closest_common_ancestor(sdd, tdd);
2022 adelta = would_change(sdd, -space, ancestor);
2023 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
2025 return (SET_ERROR(ENOSPC));
2027 err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT,
2031 err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT,
2040 dsl_dir_snap_cmtime(dsl_dir_t *dd)
2044 mutex_enter(&dd->dd_lock);
2045 t = dd->dd_snap_cmtime;
2046 mutex_exit(&dd->dd_lock);
2052 dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
2057 mutex_enter(&dd->dd_lock);
2058 dd->dd_snap_cmtime = t;
2059 mutex_exit(&dd->dd_lock);
2063 dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx)
2065 objset_t *mos = dd->dd_pool->dp_meta_objset;
2066 dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
2070 dsl_dir_is_zapified(dsl_dir_t *dd)
2072 dmu_object_info_t doi;
2074 dmu_object_info_from_db(dd->dd_dbuf, &doi);
2075 return (doi.doi_type == DMU_OTN_ZAP_METADATA);