+++ /dev/null
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-/*
- * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
- * Copyright (c) 2013 Martin Matuska. All rights reserved.
- * Copyright (c) 2014 Joyent, Inc. All rights reserved.
- * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
- * Copyright (c) 2016 Actifio, Inc. All rights reserved.
- */
-
-#include <sys/dmu.h>
-#include <sys/dmu_objset.h>
-#include <sys/dmu_tx.h>
-#include <sys/dsl_dataset.h>
-#include <sys/dsl_dir.h>
-#include <sys/dsl_prop.h>
-#include <sys/dsl_synctask.h>
-#include <sys/dsl_deleg.h>
-#include <sys/dmu_impl.h>
-#include <sys/spa.h>
-#include <sys/metaslab.h>
-#include <sys/zap.h>
-#include <sys/zio.h>
-#include <sys/arc.h>
-#include <sys/sunddi.h>
-#include <sys/zfeature.h>
-#include <sys/policy.h>
-#include <sys/zfs_znode.h>
-#include <sys/zvol.h>
-#include "zfs_namecheck.h"
-#include "zfs_prop.h"
-
-/*
- * Filesystem and Snapshot Limits
- * ------------------------------
- *
- * These limits are used to restrict the number of filesystems and/or snapshots
- * that can be created at a given level in the tree or below. A typical
- * use-case is with a delegated dataset where the administrator wants to ensure
- * that a user within the zone is not creating too many additional filesystems
- * or snapshots, even though they're not exceeding their space quota.
- *
- * The filesystem and snapshot counts are stored as extensible properties. This
- * capability is controlled by a feature flag and must be enabled to be used.
- * Once enabled, the feature is not active until the first limit is set. At
- * that point, future operations to create/destroy filesystems or snapshots
- * will validate and update the counts.
- *
- * Because the count properties will not exist before the feature is active,
- * the counts are updated when a limit is first set on an uninitialized
- * dsl_dir node in the tree (The filesystem/snapshot count on a node includes
- * all of the nested filesystems/snapshots. Thus, a new leaf node has a
- * filesystem count of 0 and a snapshot count of 0. Non-existent filesystem and
- * snapshot count properties on a node indicate uninitialized counts on that
- * node.) When first setting a limit on an uninitialized node, the code starts
- * at the filesystem with the new limit and descends into all sub-filesystems
- * to add the count properties.
- *
- * In practice this is lightweight since a limit is typically set when the
- * filesystem is created and thus has no children. Once valid, changing the
- * limit value won't require a re-traversal since the counts are already valid.
- * When recursively fixing the counts, if a node with a limit is encountered
- * during the descent, the counts are known to be valid and there is no need to
- * descend into that filesystem's children. The counts on filesystems above the
- * one with the new limit will still be uninitialized, unless a limit is
- * eventually set on one of those filesystems. The counts are always recursively
- * updated when a limit is set on a dataset, unless there is already a limit.
- * When a new limit value is set on a filesystem with an existing limit, it is
- * possible for the new limit to be less than the current count at that level
- * since a user who can change the limit is also allowed to exceed the limit.
- *
- * Once the feature is active, then whenever a filesystem or snapshot is
- * created, the code recurses up the tree, validating the new count against the
- * limit at each initialized level. In practice, most levels will not have a
- * limit set. If there is a limit at any initialized level up the tree, the
- * check must pass or the creation will fail. Likewise, when a filesystem or
- * snapshot is destroyed, the counts are recursively adjusted all the way up
- * the initizized nodes in the tree. Renaming a filesystem into different point
- * in the tree will first validate, then update the counts on each branch up to
- * the common ancestor. A receive will also validate the counts and then update
- * them.
- *
- * An exception to the above behavior is that the limit is not enforced if the
- * user has permission to modify the limit. This is primarily so that
- * recursive snapshots in the global zone always work. We want to prevent a
- * denial-of-service in which a lower level delegated dataset could max out its
- * limit and thus block recursive snapshots from being taken in the global zone.
- * Because of this, it is possible for the snapshot count to be over the limit
- * and snapshots taken in the global zone could cause a lower level dataset to
- * hit or exceed its limit. The administrator taking the global zone recursive
- * snapshot should be aware of this side-effect and behave accordingly.
- * For consistency, the filesystem limit is also not enforced if the user can
- * modify the limit.
- *
- * The filesystem and snapshot limits are validated by dsl_fs_ss_limit_check()
- * and updated by dsl_fs_ss_count_adjust(). A new limit value is setup in
- * dsl_dir_activate_fs_ss_limit() and the counts are adjusted, if necessary, by
- * dsl_dir_init_fs_ss_count().
- *
- * There is a special case when we receive a filesystem that already exists. In
- * this case a temporary clone name of %X is created (see dmu_recv_begin). We
- * never update the filesystem counts for temporary clones.
- *
- * Likewise, we do not update the snapshot counts for temporary snapshots,
- * such as those created by zfs diff.
- */
-
-extern inline dsl_dir_phys_t *dsl_dir_phys(dsl_dir_t *dd);
-
-static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
-
-static void
-dsl_dir_evict_async(void *dbu)
-{
- dsl_dir_t *dd = dbu;
- int t;
- ASSERTV(dsl_pool_t *dp = dd->dd_pool);
-
- dd->dd_dbuf = NULL;
-
- for (t = 0; t < TXG_SIZE; t++) {
- ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
- ASSERT(dd->dd_tempreserved[t] == 0);
- ASSERT(dd->dd_space_towrite[t] == 0);
- }
-
- if (dd->dd_parent)
- dsl_dir_async_rele(dd->dd_parent, dd);
-
- spa_async_close(dd->dd_pool->dp_spa, dd);
-
- dsl_prop_fini(dd);
- mutex_destroy(&dd->dd_lock);
- kmem_free(dd, sizeof (dsl_dir_t));
-}
-
-int
-dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
- const char *tail, void *tag, dsl_dir_t **ddp)
-{
- dmu_buf_t *dbuf;
- dsl_dir_t *dd;
- int err;
-
- ASSERT(dsl_pool_config_held(dp));
-
- err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
- if (err != 0)
- return (err);
- dd = dmu_buf_get_user(dbuf);
-#ifdef ZFS_DEBUG
- {
- dmu_object_info_t doi;
- dmu_object_info_from_db(dbuf, &doi);
- ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR);
- ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t));
- }
-#endif
- if (dd == NULL) {
- dsl_dir_t *winner;
-
- dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
- dd->dd_object = ddobj;
- dd->dd_dbuf = dbuf;
- dd->dd_pool = dp;
- mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL);
- dsl_prop_init(dd);
-
- dsl_dir_snap_cmtime_update(dd);
-
- if (dsl_dir_phys(dd)->dd_parent_obj) {
- err = dsl_dir_hold_obj(dp,
- dsl_dir_phys(dd)->dd_parent_obj, NULL, dd,
- &dd->dd_parent);
- if (err != 0)
- goto errout;
- if (tail) {
-#ifdef ZFS_DEBUG
- uint64_t foundobj;
-
- err = zap_lookup(dp->dp_meta_objset,
- dsl_dir_phys(dd->dd_parent)->
- dd_child_dir_zapobj, tail,
- sizeof (foundobj), 1, &foundobj);
- ASSERT(err || foundobj == ddobj);
-#endif
- (void) strlcpy(dd->dd_myname, tail,
- sizeof (dd->dd_myname));
- } else {
- err = zap_value_search(dp->dp_meta_objset,
- dsl_dir_phys(dd->dd_parent)->
- dd_child_dir_zapobj,
- ddobj, 0, dd->dd_myname);
- }
- if (err != 0)
- goto errout;
- } else {
- (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa));
- }
-
- if (dsl_dir_is_clone(dd)) {
- dmu_buf_t *origin_bonus;
- dsl_dataset_phys_t *origin_phys;
-
- /*
- * We can't open the origin dataset, because
- * that would require opening this dsl_dir.
- * Just look at its phys directly instead.
- */
- err = dmu_bonus_hold(dp->dp_meta_objset,
- dsl_dir_phys(dd)->dd_origin_obj, FTAG,
- &origin_bonus);
- if (err != 0)
- goto errout;
- origin_phys = origin_bonus->db_data;
- dd->dd_origin_txg =
- origin_phys->ds_creation_txg;
- dmu_buf_rele(origin_bonus, FTAG);
- }
-
- dmu_buf_init_user(&dd->dd_dbu, NULL, dsl_dir_evict_async,
- &dd->dd_dbuf);
- winner = dmu_buf_set_user_ie(dbuf, &dd->dd_dbu);
- if (winner != NULL) {
- if (dd->dd_parent)
- dsl_dir_rele(dd->dd_parent, dd);
- dsl_prop_fini(dd);
- mutex_destroy(&dd->dd_lock);
- kmem_free(dd, sizeof (dsl_dir_t));
- dd = winner;
- } else {
- spa_open_ref(dp->dp_spa, dd);
- }
- }
-
- /*
- * The dsl_dir_t has both open-to-close and instantiate-to-evict
- * holds on the spa. We need the open-to-close holds because
- * otherwise the spa_refcnt wouldn't change when we open a
- * dir which the spa also has open, so we could incorrectly
- * think it was OK to unload/export/destroy the pool. We need
- * the instantiate-to-evict hold because the dsl_dir_t has a
- * pointer to the dd_pool, which has a pointer to the spa_t.
- */
- spa_open_ref(dp->dp_spa, tag);
- ASSERT3P(dd->dd_pool, ==, dp);
- ASSERT3U(dd->dd_object, ==, ddobj);
- ASSERT3P(dd->dd_dbuf, ==, dbuf);
- *ddp = dd;
- return (0);
-
-errout:
- if (dd->dd_parent)
- dsl_dir_rele(dd->dd_parent, dd);
- dsl_prop_fini(dd);
- mutex_destroy(&dd->dd_lock);
- kmem_free(dd, sizeof (dsl_dir_t));
- dmu_buf_rele(dbuf, tag);
- return (err);
-}
-
-void
-dsl_dir_rele(dsl_dir_t *dd, void *tag)
-{
- dprintf_dd(dd, "%s\n", "");
- spa_close(dd->dd_pool->dp_spa, tag);
- dmu_buf_rele(dd->dd_dbuf, tag);
-}
-
-/*
- * Remove a reference to the given dsl dir that is being asynchronously
- * released. Async releases occur from a taskq performing eviction of
- * dsl datasets and dirs. This process is identical to a normal release
- * with the exception of using the async API for releasing the reference on
- * the spa.
- */
-void
-dsl_dir_async_rele(dsl_dir_t *dd, void *tag)
-{
- dprintf_dd(dd, "%s\n", "");
- spa_async_close(dd->dd_pool->dp_spa, tag);
- dmu_buf_rele(dd->dd_dbuf, tag);
-}
-
-/* buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes */
-void
-dsl_dir_name(dsl_dir_t *dd, char *buf)
-{
- if (dd->dd_parent) {
- dsl_dir_name(dd->dd_parent, buf);
- VERIFY3U(strlcat(buf, "/", ZFS_MAX_DATASET_NAME_LEN), <,
- ZFS_MAX_DATASET_NAME_LEN);
- } else {
- buf[0] = '\0';
- }
- if (!MUTEX_HELD(&dd->dd_lock)) {
- /*
- * recursive mutex so that we can use
- * dprintf_dd() with dd_lock held
- */
- mutex_enter(&dd->dd_lock);
- VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
- <, ZFS_MAX_DATASET_NAME_LEN);
- mutex_exit(&dd->dd_lock);
- } else {
- VERIFY3U(strlcat(buf, dd->dd_myname, ZFS_MAX_DATASET_NAME_LEN),
- <, ZFS_MAX_DATASET_NAME_LEN);
- }
-}
-
-/* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
-int
-dsl_dir_namelen(dsl_dir_t *dd)
-{
- int result = 0;
-
- if (dd->dd_parent) {
- /* parent's name + 1 for the "/" */
- result = dsl_dir_namelen(dd->dd_parent) + 1;
- }
-
- if (!MUTEX_HELD(&dd->dd_lock)) {
- /* see dsl_dir_name */
- mutex_enter(&dd->dd_lock);
- result += strlen(dd->dd_myname);
- mutex_exit(&dd->dd_lock);
- } else {
- result += strlen(dd->dd_myname);
- }
-
- return (result);
-}
-
-static int
-getcomponent(const char *path, char *component, const char **nextp)
-{
- char *p;
-
- if ((path == NULL) || (path[0] == '\0'))
- return (SET_ERROR(ENOENT));
- /* This would be a good place to reserve some namespace... */
- p = strpbrk(path, "/@");
- if (p && (p[1] == '/' || p[1] == '@')) {
- /* two separators in a row */
- return (SET_ERROR(EINVAL));
- }
- if (p == NULL || p == path) {
- /*
- * if the first thing is an @ or /, it had better be an
- * @ and it had better not have any more ats or slashes,
- * and it had better have something after the @.
- */
- if (p != NULL &&
- (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0'))
- return (SET_ERROR(EINVAL));
- if (strlen(path) >= ZFS_MAX_DATASET_NAME_LEN)
- return (SET_ERROR(ENAMETOOLONG));
- (void) strcpy(component, path);
- p = NULL;
- } else if (p[0] == '/') {
- if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
- return (SET_ERROR(ENAMETOOLONG));
- (void) strncpy(component, path, p - path);
- component[p - path] = '\0';
- p++;
- } else if (p[0] == '@') {
- /*
- * if the next separator is an @, there better not be
- * any more slashes.
- */
- if (strchr(path, '/'))
- return (SET_ERROR(EINVAL));
- if (p - path >= ZFS_MAX_DATASET_NAME_LEN)
- return (SET_ERROR(ENAMETOOLONG));
- (void) strncpy(component, path, p - path);
- component[p - path] = '\0';
- } else {
- panic("invalid p=%p", (void *)p);
- }
- *nextp = p;
- return (0);
-}
-
-/*
- * Return the dsl_dir_t, and possibly the last component which couldn't
- * be found in *tail. The name must be in the specified dsl_pool_t. This
- * thread must hold the dp_config_rwlock for the pool. Returns NULL if the
- * path is bogus, or if tail==NULL and we couldn't parse the whole name.
- * (*tail)[0] == '@' means that the last component is a snapshot.
- */
-int
-dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
- dsl_dir_t **ddp, const char **tailp)
-{
- char *buf;
- const char *spaname, *next, *nextnext = NULL;
- int err;
- dsl_dir_t *dd;
- uint64_t ddobj;
-
- buf = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
- err = getcomponent(name, buf, &next);
- if (err != 0)
- goto error;
-
- /* Make sure the name is in the specified pool. */
- spaname = spa_name(dp->dp_spa);
- if (strcmp(buf, spaname) != 0) {
- err = SET_ERROR(EXDEV);
- goto error;
- }
-
- ASSERT(dsl_pool_config_held(dp));
-
- err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
- if (err != 0) {
- goto error;
- }
-
- while (next != NULL) {
- dsl_dir_t *child_dd;
- err = getcomponent(next, buf, &nextnext);
- if (err != 0)
- break;
- ASSERT(next[0] != '\0');
- if (next[0] == '@')
- break;
- dprintf("looking up %s in obj%lld\n",
- buf, dsl_dir_phys(dd)->dd_child_dir_zapobj);
-
- err = zap_lookup(dp->dp_meta_objset,
- dsl_dir_phys(dd)->dd_child_dir_zapobj,
- buf, sizeof (ddobj), 1, &ddobj);
- if (err != 0) {
- if (err == ENOENT)
- err = 0;
- break;
- }
-
- err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_dd);
- if (err != 0)
- break;
- dsl_dir_rele(dd, tag);
- dd = child_dd;
- next = nextnext;
- }
-
- if (err != 0) {
- dsl_dir_rele(dd, tag);
- goto error;
- }
-
- /*
- * It's an error if there's more than one component left, or
- * tailp==NULL and there's any component left.
- */
- if (next != NULL &&
- (tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
- /* bad path name */
- dsl_dir_rele(dd, tag);
- dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
- err = SET_ERROR(ENOENT);
- }
- if (tailp != NULL)
- *tailp = next;
- *ddp = dd;
-error:
- kmem_free(buf, ZFS_MAX_DATASET_NAME_LEN);
- return (err);
-}
-
-/*
- * If the counts are already initialized for this filesystem and its
- * descendants then do nothing, otherwise initialize the counts.
- *
- * The counts on this filesystem, and those below, may be uninitialized due to
- * either the use of a pre-existing pool which did not support the
- * filesystem/snapshot limit feature, or one in which the feature had not yet
- * been enabled.
- *
- * Recursively descend the filesystem tree and update the filesystem/snapshot
- * counts on each filesystem below, then update the cumulative count on the
- * current filesystem. If the filesystem already has a count set on it,
- * then we know that its counts, and the counts on the filesystems below it,
- * are already correct, so we don't have to update this filesystem.
- */
-static void
-dsl_dir_init_fs_ss_count(dsl_dir_t *dd, dmu_tx_t *tx)
-{
- uint64_t my_fs_cnt = 0;
- uint64_t my_ss_cnt = 0;
- dsl_pool_t *dp = dd->dd_pool;
- objset_t *os = dp->dp_meta_objset;
- zap_cursor_t *zc;
- zap_attribute_t *za;
- dsl_dataset_t *ds;
-
- ASSERT(spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT));
- ASSERT(dsl_pool_config_held(dp));
- ASSERT(dmu_tx_is_syncing(tx));
-
- dsl_dir_zapify(dd, tx);
-
- /*
- * If the filesystem count has already been initialized then we
- * don't need to recurse down any further.
- */
- if (zap_contains(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT) == 0)
- return;
-
- zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
- za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
-
- /* Iterate my child dirs */
- for (zap_cursor_init(zc, os, dsl_dir_phys(dd)->dd_child_dir_zapobj);
- zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) {
- dsl_dir_t *chld_dd;
- uint64_t count;
-
- VERIFY0(dsl_dir_hold_obj(dp, za->za_first_integer, NULL, FTAG,
- &chld_dd));
-
- /*
- * Ignore hidden ($FREE, $MOS & $ORIGIN) objsets and
- * temporary datasets.
- */
- if (chld_dd->dd_myname[0] == '$' ||
- chld_dd->dd_myname[0] == '%') {
- dsl_dir_rele(chld_dd, FTAG);
- continue;
- }
-
- my_fs_cnt++; /* count this child */
-
- dsl_dir_init_fs_ss_count(chld_dd, tx);
-
- VERIFY0(zap_lookup(os, chld_dd->dd_object,
- DD_FIELD_FILESYSTEM_COUNT, sizeof (count), 1, &count));
- my_fs_cnt += count;
- VERIFY0(zap_lookup(os, chld_dd->dd_object,
- DD_FIELD_SNAPSHOT_COUNT, sizeof (count), 1, &count));
- my_ss_cnt += count;
-
- dsl_dir_rele(chld_dd, FTAG);
- }
- zap_cursor_fini(zc);
- /* Count my snapshots (we counted children's snapshots above) */
- VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
- dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds));
-
- for (zap_cursor_init(zc, os, dsl_dataset_phys(ds)->ds_snapnames_zapobj);
- zap_cursor_retrieve(zc, za) == 0;
- zap_cursor_advance(zc)) {
- /* Don't count temporary snapshots */
- if (za->za_name[0] != '%')
- my_ss_cnt++;
- }
- zap_cursor_fini(zc);
-
- dsl_dataset_rele(ds, FTAG);
-
- kmem_free(zc, sizeof (zap_cursor_t));
- kmem_free(za, sizeof (zap_attribute_t));
-
- /* we're in a sync task, update counts */
- dmu_buf_will_dirty(dd->dd_dbuf, tx);
- VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
- sizeof (my_fs_cnt), 1, &my_fs_cnt, tx));
- VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
- sizeof (my_ss_cnt), 1, &my_ss_cnt, tx));
-}
-
-static int
-dsl_dir_actv_fs_ss_limit_check(void *arg, dmu_tx_t *tx)
-{
- char *ddname = (char *)arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- dsl_dir_t *dd;
- int error;
-
- error = dsl_dataset_hold(dp, ddname, FTAG, &ds);
- if (error != 0)
- return (error);
-
- if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
- dsl_dataset_rele(ds, FTAG);
- return (SET_ERROR(ENOTSUP));
- }
-
- dd = ds->ds_dir;
- if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT) &&
- dsl_dir_is_zapified(dd) &&
- zap_contains(dp->dp_meta_objset, dd->dd_object,
- DD_FIELD_FILESYSTEM_COUNT) == 0) {
- dsl_dataset_rele(ds, FTAG);
- return (SET_ERROR(EALREADY));
- }
-
- dsl_dataset_rele(ds, FTAG);
- return (0);
-}
-
-static void
-dsl_dir_actv_fs_ss_limit_sync(void *arg, dmu_tx_t *tx)
-{
- char *ddname = (char *)arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- spa_t *spa;
-
- VERIFY0(dsl_dataset_hold(dp, ddname, FTAG, &ds));
-
- spa = dsl_dataset_get_spa(ds);
-
- if (!spa_feature_is_active(spa, SPA_FEATURE_FS_SS_LIMIT)) {
- /*
- * Since the feature was not active and we're now setting a
- * limit, increment the feature-active counter so that the
- * feature becomes active for the first time.
- *
- * We are already in a sync task so we can update the MOS.
- */
- spa_feature_incr(spa, SPA_FEATURE_FS_SS_LIMIT, tx);
- }
-
- /*
- * Since we are now setting a non-UINT64_MAX limit on the filesystem,
- * we need to ensure the counts are correct. Descend down the tree from
- * this point and update all of the counts to be accurate.
- */
- dsl_dir_init_fs_ss_count(ds->ds_dir, tx);
-
- dsl_dataset_rele(ds, FTAG);
-}
-
-/*
- * Make sure the feature is enabled and activate it if necessary.
- * Since we're setting a limit, ensure the on-disk counts are valid.
- * This is only called by the ioctl path when setting a limit value.
- *
- * We do not need to validate the new limit, since users who can change the
- * limit are also allowed to exceed the limit.
- */
-int
-dsl_dir_activate_fs_ss_limit(const char *ddname)
-{
- int error;
-
- error = dsl_sync_task(ddname, dsl_dir_actv_fs_ss_limit_check,
- dsl_dir_actv_fs_ss_limit_sync, (void *)ddname, 0,
- ZFS_SPACE_CHECK_RESERVED);
-
- if (error == EALREADY)
- error = 0;
-
- return (error);
-}
-
-/*
- * Used to determine if the filesystem_limit or snapshot_limit should be
- * enforced. We allow the limit to be exceeded if the user has permission to
- * write the property value. We pass in the creds that we got in the open
- * context since we will always be the GZ root in syncing context. We also have
- * to handle the case where we are allowed to change the limit on the current
- * dataset, but there may be another limit in the tree above.
- *
- * We can never modify these two properties within a non-global zone. In
- * addition, the other checks are modeled on zfs_secpolicy_write_perms. We
- * can't use that function since we are already holding the dp_config_rwlock.
- * In addition, we already have the dd and dealing with snapshots is simplified
- * in this code.
- */
-
-typedef enum {
- ENFORCE_ALWAYS,
- ENFORCE_NEVER,
- ENFORCE_ABOVE
-} enforce_res_t;
-
-static enforce_res_t
-dsl_enforce_ds_ss_limits(dsl_dir_t *dd, zfs_prop_t prop, cred_t *cr)
-{
- enforce_res_t enforce = ENFORCE_ALWAYS;
- uint64_t obj;
- dsl_dataset_t *ds;
- uint64_t zoned;
-
- ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
- prop == ZFS_PROP_SNAPSHOT_LIMIT);
-
-#ifdef _KERNEL
- if (crgetzoneid(cr) != GLOBAL_ZONEID)
- return (ENFORCE_ALWAYS);
-
- if (secpolicy_zfs(cr) == 0)
- return (ENFORCE_NEVER);
-#endif
-
- if ((obj = dsl_dir_phys(dd)->dd_head_dataset_obj) == 0)
- return (ENFORCE_ALWAYS);
-
- ASSERT(dsl_pool_config_held(dd->dd_pool));
-
- if (dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds) != 0)
- return (ENFORCE_ALWAYS);
-
- if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL) || zoned) {
- /* Only root can access zoned fs's from the GZ */
- enforce = ENFORCE_ALWAYS;
- } else {
- if (dsl_deleg_access_impl(ds, zfs_prop_to_name(prop), cr) == 0)
- enforce = ENFORCE_ABOVE;
- }
-
- dsl_dataset_rele(ds, FTAG);
- return (enforce);
-}
-
-/*
- * Check if adding additional child filesystem(s) would exceed any filesystem
- * limits or adding additional snapshot(s) would exceed any snapshot limits.
- * The prop argument indicates which limit to check.
- *
- * Note that all filesystem limits up to the root (or the highest
- * initialized) filesystem or the given ancestor must be satisfied.
- */
-int
-dsl_fs_ss_limit_check(dsl_dir_t *dd, uint64_t delta, zfs_prop_t prop,
- dsl_dir_t *ancestor, cred_t *cr)
-{
- objset_t *os = dd->dd_pool->dp_meta_objset;
- uint64_t limit, count;
- char *count_prop;
- enforce_res_t enforce;
- int err = 0;
-
- ASSERT(dsl_pool_config_held(dd->dd_pool));
- ASSERT(prop == ZFS_PROP_FILESYSTEM_LIMIT ||
- prop == ZFS_PROP_SNAPSHOT_LIMIT);
-
- /*
- * If we're allowed to change the limit, don't enforce the limit
- * e.g. this can happen if a snapshot is taken by an administrative
- * user in the global zone (i.e. a recursive snapshot by root).
- * However, we must handle the case of delegated permissions where we
- * are allowed to change the limit on the current dataset, but there
- * is another limit in the tree above.
- */
- enforce = dsl_enforce_ds_ss_limits(dd, prop, cr);
- if (enforce == ENFORCE_NEVER)
- return (0);
-
- /*
- * e.g. if renaming a dataset with no snapshots, count adjustment
- * is 0.
- */
- if (delta == 0)
- return (0);
-
- if (prop == ZFS_PROP_SNAPSHOT_LIMIT) {
- /*
- * We don't enforce the limit for temporary snapshots. This is
- * indicated by a NULL cred_t argument.
- */
- if (cr == NULL)
- return (0);
-
- count_prop = DD_FIELD_SNAPSHOT_COUNT;
- } else {
- count_prop = DD_FIELD_FILESYSTEM_COUNT;
- }
-
- /*
- * If an ancestor has been provided, stop checking the limit once we
- * hit that dir. We need this during rename so that we don't overcount
- * the check once we recurse up to the common ancestor.
- */
- if (ancestor == dd)
- return (0);
-
- /*
- * If we hit an uninitialized node while recursing up the tree, we can
- * stop since we know there is no limit here (or above). The counts are
- * not valid on this node and we know we won't touch this node's counts.
- */
- if (!dsl_dir_is_zapified(dd) || zap_lookup(os, dd->dd_object,
- count_prop, sizeof (count), 1, &count) == ENOENT)
- return (0);
-
- err = dsl_prop_get_dd(dd, zfs_prop_to_name(prop), 8, 1, &limit, NULL,
- B_FALSE);
- if (err != 0)
- return (err);
-
- /* Is there a limit which we've hit? */
- if (enforce == ENFORCE_ALWAYS && (count + delta) > limit)
- return (SET_ERROR(EDQUOT));
-
- if (dd->dd_parent != NULL)
- err = dsl_fs_ss_limit_check(dd->dd_parent, delta, prop,
- ancestor, cr);
-
- return (err);
-}
-
-/*
- * Adjust the filesystem or snapshot count for the specified dsl_dir_t and all
- * parents. When a new filesystem/snapshot is created, increment the count on
- * all parents, and when a filesystem/snapshot is destroyed, decrement the
- * count.
- */
-void
-dsl_fs_ss_count_adjust(dsl_dir_t *dd, int64_t delta, const char *prop,
- dmu_tx_t *tx)
-{
- int err;
- objset_t *os = dd->dd_pool->dp_meta_objset;
- uint64_t count;
-
- ASSERT(dsl_pool_config_held(dd->dd_pool));
- ASSERT(dmu_tx_is_syncing(tx));
- ASSERT(strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0 ||
- strcmp(prop, DD_FIELD_SNAPSHOT_COUNT) == 0);
-
- /*
- * When we receive an incremental stream into a filesystem that already
- * exists, a temporary clone is created. We don't count this temporary
- * clone, whose name begins with a '%'. We also ignore hidden ($FREE,
- * $MOS & $ORIGIN) objsets.
- */
- if ((dd->dd_myname[0] == '%' || dd->dd_myname[0] == '$') &&
- strcmp(prop, DD_FIELD_FILESYSTEM_COUNT) == 0)
- return;
-
- /*
- * e.g. if renaming a dataset with no snapshots, count adjustment is 0
- */
- if (delta == 0)
- return;
-
- /*
- * If we hit an uninitialized node while recursing up the tree, we can
- * stop since we know the counts are not valid on this node and we
- * know we shouldn't touch this node's counts. An uninitialized count
- * on the node indicates that either the feature has not yet been
- * activated or there are no limits on this part of the tree.
- */
- if (!dsl_dir_is_zapified(dd) || (err = zap_lookup(os, dd->dd_object,
- prop, sizeof (count), 1, &count)) == ENOENT)
- return;
- VERIFY0(err);
-
- count += delta;
- /* Use a signed verify to make sure we're not neg. */
- VERIFY3S(count, >=, 0);
-
- VERIFY0(zap_update(os, dd->dd_object, prop, sizeof (count), 1, &count,
- tx));
-
- /* Roll up this additional count into our ancestors */
- if (dd->dd_parent != NULL)
- dsl_fs_ss_count_adjust(dd->dd_parent, delta, prop, tx);
-}
-
-uint64_t
-dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
- dmu_tx_t *tx)
-{
- objset_t *mos = dp->dp_meta_objset;
- uint64_t ddobj;
- dsl_dir_phys_t *ddphys;
- dmu_buf_t *dbuf;
-
- ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
- DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
- if (pds) {
- VERIFY(0 == zap_add(mos, dsl_dir_phys(pds)->dd_child_dir_zapobj,
- name, sizeof (uint64_t), 1, &ddobj, tx));
- } else {
- /* it's the root dir */
- VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
- DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
- }
- VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
- dmu_buf_will_dirty(dbuf, tx);
- ddphys = dbuf->db_data;
-
- ddphys->dd_creation_time = gethrestime_sec();
- if (pds) {
- ddphys->dd_parent_obj = pds->dd_object;
-
- /* update the filesystem counts */
- dsl_fs_ss_count_adjust(pds, 1, DD_FIELD_FILESYSTEM_COUNT, tx);
- }
- ddphys->dd_props_zapobj = zap_create(mos,
- DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
- ddphys->dd_child_dir_zapobj = zap_create(mos,
- DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
- if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
- ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
- dmu_buf_rele(dbuf, FTAG);
-
- return (ddobj);
-}
-
-boolean_t
-dsl_dir_is_clone(dsl_dir_t *dd)
-{
- return (dsl_dir_phys(dd)->dd_origin_obj &&
- (dd->dd_pool->dp_origin_snap == NULL ||
- dsl_dir_phys(dd)->dd_origin_obj !=
- dd->dd_pool->dp_origin_snap->ds_object));
-}
-
-void
-dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
-{
- mutex_enter(&dd->dd_lock);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
- dsl_dir_phys(dd)->dd_used_bytes);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA,
- dsl_dir_phys(dd)->dd_quota);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
- dsl_dir_phys(dd)->dd_reserved);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
- dsl_dir_phys(dd)->dd_compressed_bytes == 0 ? 100 :
- (dsl_dir_phys(dd)->dd_uncompressed_bytes * 100 /
- dsl_dir_phys(dd)->dd_compressed_bytes));
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED,
- dsl_dir_phys(dd)->dd_uncompressed_bytes);
- if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
- dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
- dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_HEAD]);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
- dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_REFRSRV]);
- dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
- dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD] +
- dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_CHILD_RSRV]);
- }
- mutex_exit(&dd->dd_lock);
-
- if (dsl_dir_is_zapified(dd)) {
- uint64_t count;
- objset_t *os = dd->dd_pool->dp_meta_objset;
-
- if (zap_lookup(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
- sizeof (count), 1, &count) == 0) {
- dsl_prop_nvlist_add_uint64(nv,
- ZFS_PROP_FILESYSTEM_COUNT, count);
- }
- if (zap_lookup(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
- sizeof (count), 1, &count) == 0) {
- dsl_prop_nvlist_add_uint64(nv,
- ZFS_PROP_SNAPSHOT_COUNT, count);
- }
- }
-
- if (dsl_dir_is_clone(dd)) {
- dsl_dataset_t *ds;
- char buf[ZFS_MAX_DATASET_NAME_LEN];
-
- VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
- dsl_dir_phys(dd)->dd_origin_obj, FTAG, &ds));
- dsl_dataset_name(ds, buf);
- dsl_dataset_rele(ds, FTAG);
- dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
- }
-}
-
-void
-dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
-{
- dsl_pool_t *dp = dd->dd_pool;
-
- ASSERT(dsl_dir_phys(dd));
-
- if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) {
- /* up the hold count until we can be written out */
- dmu_buf_add_ref(dd->dd_dbuf, dd);
- }
-}
-
-static int64_t
-parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
-{
- uint64_t old_accounted = MAX(used, dsl_dir_phys(dd)->dd_reserved);
- uint64_t new_accounted =
- MAX(used + delta, dsl_dir_phys(dd)->dd_reserved);
- return (new_accounted - old_accounted);
-}
-
-void
-dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
-{
- ASSERT(dmu_tx_is_syncing(tx));
-
- mutex_enter(&dd->dd_lock);
- ASSERT0(dd->dd_tempreserved[tx->tx_txg&TXG_MASK]);
- dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
- dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
- dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
- mutex_exit(&dd->dd_lock);
-
- /* release the hold from dsl_dir_dirty */
- dmu_buf_rele(dd->dd_dbuf, dd);
-}
-
-static uint64_t
-dsl_dir_space_towrite(dsl_dir_t *dd)
-{
- uint64_t space = 0;
-
- ASSERT(MUTEX_HELD(&dd->dd_lock));
-
- for (int i = 0; i < TXG_SIZE; i++) {
- space += dd->dd_space_towrite[i & TXG_MASK];
- ASSERT3U(dd->dd_space_towrite[i & TXG_MASK], >=, 0);
- }
- return (space);
-}
-
-/*
- * How much space would dd have available if ancestor had delta applied
- * to it? If ondiskonly is set, we're only interested in what's
- * on-disk, not estimated pending changes.
- */
-uint64_t
-dsl_dir_space_available(dsl_dir_t *dd,
- dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
-{
- uint64_t parentspace, myspace, quota, used;
-
- /*
- * If there are no restrictions otherwise, assume we have
- * unlimited space available.
- */
- quota = UINT64_MAX;
- parentspace = UINT64_MAX;
-
- if (dd->dd_parent != NULL) {
- parentspace = dsl_dir_space_available(dd->dd_parent,
- ancestor, delta, ondiskonly);
- }
-
- mutex_enter(&dd->dd_lock);
- if (dsl_dir_phys(dd)->dd_quota != 0)
- quota = dsl_dir_phys(dd)->dd_quota;
- used = dsl_dir_phys(dd)->dd_used_bytes;
- if (!ondiskonly)
- used += dsl_dir_space_towrite(dd);
-
- if (dd->dd_parent == NULL) {
- uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE);
- quota = MIN(quota, poolsize);
- }
-
- if (dsl_dir_phys(dd)->dd_reserved > used && parentspace != UINT64_MAX) {
- /*
- * We have some space reserved, in addition to what our
- * parent gave us.
- */
- parentspace += dsl_dir_phys(dd)->dd_reserved - used;
- }
-
- if (dd == ancestor) {
- ASSERT(delta <= 0);
- ASSERT(used >= -delta);
- used += delta;
- if (parentspace != UINT64_MAX)
- parentspace -= delta;
- }
-
- if (used > quota) {
- /* over quota */
- myspace = 0;
- } else {
- /*
- * the lesser of the space provided by our parent and
- * the space left in our quota
- */
- myspace = MIN(parentspace, quota - used);
- }
-
- mutex_exit(&dd->dd_lock);
-
- return (myspace);
-}
-
-struct tempreserve {
- list_node_t tr_node;
- dsl_dir_t *tr_ds;
- uint64_t tr_size;
-};
-
-static int
-dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
- boolean_t ignorequota, list_t *tr_list,
- dmu_tx_t *tx, boolean_t first)
-{
- uint64_t txg;
- uint64_t quota;
- struct tempreserve *tr;
- int retval;
- uint64_t ref_rsrv;
-
-top_of_function:
- txg = tx->tx_txg;
- retval = EDQUOT;
- ref_rsrv = 0;
-
- ASSERT3U(txg, !=, 0);
- ASSERT3S(asize, >, 0);
-
- mutex_enter(&dd->dd_lock);
-
- /*
- * Check against the dsl_dir's quota. We don't add in the delta
- * when checking for over-quota because they get one free hit.
- */
- uint64_t est_inflight = dsl_dir_space_towrite(dd);
- for (int i = 0; i < TXG_SIZE; i++)
- est_inflight += dd->dd_tempreserved[i];
- uint64_t used_on_disk = dsl_dir_phys(dd)->dd_used_bytes;
-
- /*
- * On the first iteration, fetch the dataset's used-on-disk and
- * refreservation values. Also, if checkrefquota is set, test if
- * allocating this space would exceed the dataset's refquota.
- */
- if (first && tx->tx_objset) {
- int error;
- dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
-
- error = dsl_dataset_check_quota(ds, !netfree,
- asize, est_inflight, &used_on_disk, &ref_rsrv);
- if (error != 0) {
- mutex_exit(&dd->dd_lock);
- DMU_TX_STAT_BUMP(dmu_tx_quota);
- return (error);
- }
- }
-
- /*
- * If this transaction will result in a net free of space,
- * we want to let it through.
- */
- if (ignorequota || netfree || dsl_dir_phys(dd)->dd_quota == 0)
- quota = UINT64_MAX;
- else
- quota = dsl_dir_phys(dd)->dd_quota;
-
- /*
- * Adjust the quota against the actual pool size at the root
- * minus any outstanding deferred frees.
- * To ensure that it's possible to remove files from a full
- * pool without inducing transient overcommits, we throttle
- * netfree transactions against a quota that is slightly larger,
- * but still within the pool's allocation slop. In cases where
- * we're very close to full, this will allow a steady trickle of
- * removes to get through.
- */
- uint64_t deferred = 0;
- if (dd->dd_parent == NULL) {
- spa_t *spa = dd->dd_pool->dp_spa;
- uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
- deferred = metaslab_class_get_deferred(spa_normal_class(spa));
- if (poolsize - deferred < quota) {
- quota = poolsize - deferred;
- retval = ENOSPC;
- }
- }
-
- /*
- * If they are requesting more space, and our current estimate
- * is over quota, they get to try again unless the actual
- * on-disk is over quota and there are no pending changes (which
- * may free up space for us).
- */
- if (used_on_disk + est_inflight >= quota) {
- if (est_inflight > 0 || used_on_disk < quota ||
- (retval == ENOSPC && used_on_disk < quota + deferred))
- retval = ERESTART;
- dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
- "quota=%lluK tr=%lluK err=%d\n",
- used_on_disk>>10, est_inflight>>10,
- quota>>10, asize>>10, retval);
- mutex_exit(&dd->dd_lock);
- DMU_TX_STAT_BUMP(dmu_tx_quota);
- return (SET_ERROR(retval));
- }
-
- /* We need to up our estimated delta before dropping dd_lock */
- dd->dd_tempreserved[txg & TXG_MASK] += asize;
-
- uint64_t parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
- asize - ref_rsrv);
- mutex_exit(&dd->dd_lock);
-
- tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
- tr->tr_ds = dd;
- tr->tr_size = asize;
- list_insert_tail(tr_list, tr);
-
- /* see if it's OK with our parent */
- if (dd->dd_parent != NULL && parent_rsrv != 0) {
- /*
- * Recurse on our parent without recursion. This has been
- * observed to be potentially large stack usage even within
- * the test suite. Largest seen stack was 7632 bytes on linux.
- */
-
- dd = dd->dd_parent;
- asize = parent_rsrv;
- ignorequota = (dsl_dir_phys(dd)->dd_head_dataset_obj == 0);
- first = B_FALSE;
- goto top_of_function;
-
- } else {
- return (0);
- }
-}
-
-/*
- * Reserve space in this dsl_dir, to be used in this tx's txg.
- * After the space has been dirtied (and dsl_dir_willuse_space()
- * has been called), the reservation should be canceled, using
- * dsl_dir_tempreserve_clear().
- */
-int
-dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
- boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx)
-{
- int err;
- list_t *tr_list;
-
- if (asize == 0) {
- *tr_cookiep = NULL;
- return (0);
- }
-
- tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
- list_create(tr_list, sizeof (struct tempreserve),
- offsetof(struct tempreserve, tr_node));
- ASSERT3S(asize, >, 0);
-
- err = arc_tempreserve_space(lsize, tx->tx_txg);
- if (err == 0) {
- struct tempreserve *tr;
-
- tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
- tr->tr_size = lsize;
- list_insert_tail(tr_list, tr);
- } else {
- if (err == EAGAIN) {
- /*
- * If arc_memory_throttle() detected that pageout
- * is running and we are low on memory, we delay new
- * non-pageout transactions to give pageout an
- * advantage.
- *
- * It is unfortunate to be delaying while the caller's
- * locks are held.
- */
- txg_delay(dd->dd_pool, tx->tx_txg,
- MSEC2NSEC(10), MSEC2NSEC(10));
- err = SET_ERROR(ERESTART);
- }
- }
-
- if (err == 0) {
- err = dsl_dir_tempreserve_impl(dd, asize, netfree,
- B_FALSE, tr_list, tx, B_TRUE);
- }
-
- if (err != 0)
- dsl_dir_tempreserve_clear(tr_list, tx);
- else
- *tr_cookiep = tr_list;
-
- return (err);
-}
-
-/*
- * Clear a temporary reservation that we previously made with
- * dsl_dir_tempreserve_space().
- */
-void
-dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
-{
- int txgidx = tx->tx_txg & TXG_MASK;
- list_t *tr_list = tr_cookie;
- struct tempreserve *tr;
-
- ASSERT3U(tx->tx_txg, !=, 0);
-
- if (tr_cookie == NULL)
- return;
-
- while ((tr = list_head(tr_list)) != NULL) {
- if (tr->tr_ds) {
- mutex_enter(&tr->tr_ds->dd_lock);
- ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
- tr->tr_size);
- tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
- mutex_exit(&tr->tr_ds->dd_lock);
- } else {
- arc_tempreserve_clear(tr->tr_size);
- }
- list_remove(tr_list, tr);
- kmem_free(tr, sizeof (struct tempreserve));
- }
-
- kmem_free(tr_list, sizeof (list_t));
-}
-
-/*
- * This should be called from open context when we think we're going to write
- * or free space, for example when dirtying data. Be conservative; it's okay
- * to write less space or free more, but we don't want to write more or free
- * less than the amount specified.
- *
- * NOTE: The behavior of this function is identical to the Illumos / FreeBSD
- * version however it has been adjusted to use an iterative rather then
- * recursive algorithm to minimize stack usage.
- */
-void
-dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
-{
- int64_t parent_space;
- uint64_t est_used;
-
- do {
- mutex_enter(&dd->dd_lock);
- if (space > 0)
- dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
-
- est_used = dsl_dir_space_towrite(dd) +
- dsl_dir_phys(dd)->dd_used_bytes;
- parent_space = parent_delta(dd, est_used, space);
- mutex_exit(&dd->dd_lock);
-
- /* Make sure that we clean up dd_space_to* */
- dsl_dir_dirty(dd, tx);
-
- dd = dd->dd_parent;
- space = parent_space;
- } while (space && dd);
-}
-
-/* call from syncing context when we actually write/free space for this dd */
-void
-dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
- int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
-{
- int64_t accounted_delta;
-
- /*
- * dsl_dataset_set_refreservation_sync_impl() calls this with
- * dd_lock held, so that it can atomically update
- * ds->ds_reserved and the dsl_dir accounting, so that
- * dsl_dataset_check_quota() can see dataset and dir accounting
- * consistently.
- */
- boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
-
- ASSERT(dmu_tx_is_syncing(tx));
- ASSERT(type < DD_USED_NUM);
-
- dmu_buf_will_dirty(dd->dd_dbuf, tx);
-
- if (needlock)
- mutex_enter(&dd->dd_lock);
- accounted_delta =
- parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, used);
- ASSERT(used >= 0 || dsl_dir_phys(dd)->dd_used_bytes >= -used);
- ASSERT(compressed >= 0 ||
- dsl_dir_phys(dd)->dd_compressed_bytes >= -compressed);
- ASSERT(uncompressed >= 0 ||
- dsl_dir_phys(dd)->dd_uncompressed_bytes >= -uncompressed);
- dsl_dir_phys(dd)->dd_used_bytes += used;
- dsl_dir_phys(dd)->dd_uncompressed_bytes += uncompressed;
- dsl_dir_phys(dd)->dd_compressed_bytes += compressed;
-
- if (dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN) {
- ASSERT(used > 0 ||
- dsl_dir_phys(dd)->dd_used_breakdown[type] >= -used);
- dsl_dir_phys(dd)->dd_used_breakdown[type] += used;
-#ifdef DEBUG
- {
- dd_used_t t;
- uint64_t u = 0;
- for (t = 0; t < DD_USED_NUM; t++)
- u += dsl_dir_phys(dd)->dd_used_breakdown[t];
- ASSERT3U(u, ==, dsl_dir_phys(dd)->dd_used_bytes);
- }
-#endif
- }
- if (needlock)
- mutex_exit(&dd->dd_lock);
-
- if (dd->dd_parent != NULL) {
- dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
- accounted_delta, compressed, uncompressed, tx);
- dsl_dir_transfer_space(dd->dd_parent,
- used - accounted_delta,
- DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
- }
-}
-
-void
-dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
- dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
-{
- ASSERT(dmu_tx_is_syncing(tx));
- ASSERT(oldtype < DD_USED_NUM);
- ASSERT(newtype < DD_USED_NUM);
-
- if (delta == 0 ||
- !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN))
- return;
-
- dmu_buf_will_dirty(dd->dd_dbuf, tx);
- mutex_enter(&dd->dd_lock);
- ASSERT(delta > 0 ?
- dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta :
- dsl_dir_phys(dd)->dd_used_breakdown[newtype] >= -delta);
- ASSERT(dsl_dir_phys(dd)->dd_used_bytes >= ABS(delta));
- dsl_dir_phys(dd)->dd_used_breakdown[oldtype] -= delta;
- dsl_dir_phys(dd)->dd_used_breakdown[newtype] += delta;
- mutex_exit(&dd->dd_lock);
-}
-
-typedef struct dsl_dir_set_qr_arg {
- const char *ddsqra_name;
- zprop_source_t ddsqra_source;
- uint64_t ddsqra_value;
-} dsl_dir_set_qr_arg_t;
-
-static int
-dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_set_qr_arg_t *ddsqra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- int error;
- uint64_t towrite, newval;
-
- error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
- if (error != 0)
- return (error);
-
- error = dsl_prop_predict(ds->ds_dir, "quota",
- ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
- if (error != 0) {
- dsl_dataset_rele(ds, FTAG);
- return (error);
- }
-
- if (newval == 0) {
- dsl_dataset_rele(ds, FTAG);
- return (0);
- }
-
- mutex_enter(&ds->ds_dir->dd_lock);
- /*
- * If we are doing the preliminary check in open context, and
- * there are pending changes, then don't fail it, since the
- * pending changes could under-estimate the amount of space to be
- * freed up.
- */
- towrite = dsl_dir_space_towrite(ds->ds_dir);
- if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
- (newval < dsl_dir_phys(ds->ds_dir)->dd_reserved ||
- newval < dsl_dir_phys(ds->ds_dir)->dd_used_bytes + towrite)) {
- error = SET_ERROR(ENOSPC);
- }
- mutex_exit(&ds->ds_dir->dd_lock);
- dsl_dataset_rele(ds, FTAG);
- return (error);
-}
-
-static void
-dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_set_qr_arg_t *ddsqra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- uint64_t newval;
-
- VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
-
- if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
- dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA),
- ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
- &ddsqra->ddsqra_value, tx);
-
- VERIFY0(dsl_prop_get_int_ds(ds,
- zfs_prop_to_name(ZFS_PROP_QUOTA), &newval));
- } else {
- newval = ddsqra->ddsqra_value;
- spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
- zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval);
- }
-
- dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
- mutex_enter(&ds->ds_dir->dd_lock);
- dsl_dir_phys(ds->ds_dir)->dd_quota = newval;
- mutex_exit(&ds->ds_dir->dd_lock);
- dsl_dataset_rele(ds, FTAG);
-}
-
-int
-dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
-{
- dsl_dir_set_qr_arg_t ddsqra;
-
- ddsqra.ddsqra_name = ddname;
- ddsqra.ddsqra_source = source;
- ddsqra.ddsqra_value = quota;
-
- return (dsl_sync_task(ddname, dsl_dir_set_quota_check,
- dsl_dir_set_quota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
-}
-
-int
-dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_set_qr_arg_t *ddsqra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- dsl_dir_t *dd;
- uint64_t newval, used, avail;
- int error;
-
- error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
- if (error != 0)
- return (error);
- dd = ds->ds_dir;
-
- /*
- * If we are doing the preliminary check in open context, the
- * space estimates may be inaccurate.
- */
- if (!dmu_tx_is_syncing(tx)) {
- dsl_dataset_rele(ds, FTAG);
- return (0);
- }
-
- error = dsl_prop_predict(ds->ds_dir,
- zfs_prop_to_name(ZFS_PROP_RESERVATION),
- ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
- if (error != 0) {
- dsl_dataset_rele(ds, FTAG);
- return (error);
- }
-
- mutex_enter(&dd->dd_lock);
- used = dsl_dir_phys(dd)->dd_used_bytes;
- mutex_exit(&dd->dd_lock);
-
- if (dd->dd_parent) {
- avail = dsl_dir_space_available(dd->dd_parent,
- NULL, 0, FALSE);
- } else {
- avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
- }
-
- if (MAX(used, newval) > MAX(used, dsl_dir_phys(dd)->dd_reserved)) {
- uint64_t delta = MAX(used, newval) -
- MAX(used, dsl_dir_phys(dd)->dd_reserved);
-
- if (delta > avail ||
- (dsl_dir_phys(dd)->dd_quota > 0 &&
- newval > dsl_dir_phys(dd)->dd_quota))
- error = SET_ERROR(ENOSPC);
- }
-
- dsl_dataset_rele(ds, FTAG);
- return (error);
-}
-
-void
-dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx)
-{
- uint64_t used;
- int64_t delta;
-
- dmu_buf_will_dirty(dd->dd_dbuf, tx);
-
- mutex_enter(&dd->dd_lock);
- used = dsl_dir_phys(dd)->dd_used_bytes;
- delta = MAX(used, value) - MAX(used, dsl_dir_phys(dd)->dd_reserved);
- dsl_dir_phys(dd)->dd_reserved = value;
-
- if (dd->dd_parent != NULL) {
- /* Roll up this additional usage into our ancestors */
- dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
- delta, 0, 0, tx);
- }
- mutex_exit(&dd->dd_lock);
-}
-
-static void
-dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_set_qr_arg_t *ddsqra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dataset_t *ds;
- uint64_t newval;
-
- VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
-
- if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
- dsl_prop_set_sync_impl(ds,
- zfs_prop_to_name(ZFS_PROP_RESERVATION),
- ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
- &ddsqra->ddsqra_value, tx);
-
- VERIFY0(dsl_prop_get_int_ds(ds,
- zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval));
- } else {
- newval = ddsqra->ddsqra_value;
- spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
- zfs_prop_to_name(ZFS_PROP_RESERVATION),
- (longlong_t)newval);
- }
-
- dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx);
- dsl_dataset_rele(ds, FTAG);
-}
-
-int
-dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
- uint64_t reservation)
-{
- dsl_dir_set_qr_arg_t ddsqra;
-
- ddsqra.ddsqra_name = ddname;
- ddsqra.ddsqra_source = source;
- ddsqra.ddsqra_value = reservation;
-
- return (dsl_sync_task(ddname, dsl_dir_set_reservation_check,
- dsl_dir_set_reservation_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE));
-}
-
-static dsl_dir_t *
-closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
-{
- for (; ds1; ds1 = ds1->dd_parent) {
- dsl_dir_t *dd;
- for (dd = ds2; dd; dd = dd->dd_parent) {
- if (ds1 == dd)
- return (dd);
- }
- }
- return (NULL);
-}
-
-/*
- * If delta is applied to dd, how much of that delta would be applied to
- * ancestor? Syncing context only.
- */
-static int64_t
-would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
-{
- if (dd == ancestor)
- return (delta);
-
- mutex_enter(&dd->dd_lock);
- delta = parent_delta(dd, dsl_dir_phys(dd)->dd_used_bytes, delta);
- mutex_exit(&dd->dd_lock);
- return (would_change(dd->dd_parent, delta, ancestor));
-}
-
-typedef struct dsl_dir_rename_arg {
- const char *ddra_oldname;
- const char *ddra_newname;
- cred_t *ddra_cred;
-} dsl_dir_rename_arg_t;
-
-/* ARGSUSED */
-static int
-dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
-{
- int *deltap = arg;
- char namebuf[ZFS_MAX_DATASET_NAME_LEN];
-
- dsl_dataset_name(ds, namebuf);
-
- if (strlen(namebuf) + *deltap >= ZFS_MAX_DATASET_NAME_LEN)
- return (SET_ERROR(ENAMETOOLONG));
- return (0);
-}
-
-static int
-dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_rename_arg_t *ddra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dir_t *dd, *newparent;
- const char *mynewname;
- int error;
- int delta = strlen(ddra->ddra_newname) - strlen(ddra->ddra_oldname);
-
- /* target dir should exist */
- error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL);
- if (error != 0)
- return (error);
-
- /* new parent should exist */
- error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG,
- &newparent, &mynewname);
- if (error != 0) {
- dsl_dir_rele(dd, FTAG);
- return (error);
- }
-
- /* can't rename to different pool */
- if (dd->dd_pool != newparent->dd_pool) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (SET_ERROR(EXDEV));
- }
-
- /* new name should not already exist */
- if (mynewname == NULL) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (SET_ERROR(EEXIST));
- }
-
- /* if the name length is growing, validate child name lengths */
- if (delta > 0) {
- error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename,
- &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
- if (error != 0) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (error);
- }
- }
-
- if (dmu_tx_is_syncing(tx)) {
- if (spa_feature_is_active(dp->dp_spa,
- SPA_FEATURE_FS_SS_LIMIT)) {
- /*
- * Although this is the check function and we don't
- * normally make on-disk changes in check functions,
- * we need to do that here.
- *
- * Ensure this portion of the tree's counts have been
- * initialized in case the new parent has limits set.
- */
- dsl_dir_init_fs_ss_count(dd, tx);
- }
- }
-
- if (newparent != dd->dd_parent) {
- /* is there enough space? */
- uint64_t myspace =
- MAX(dsl_dir_phys(dd)->dd_used_bytes,
- dsl_dir_phys(dd)->dd_reserved);
- objset_t *os = dd->dd_pool->dp_meta_objset;
- uint64_t fs_cnt = 0;
- uint64_t ss_cnt = 0;
-
- if (dsl_dir_is_zapified(dd)) {
- int err;
-
- err = zap_lookup(os, dd->dd_object,
- DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
- &fs_cnt);
- if (err != ENOENT && err != 0) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (err);
- }
-
- /*
- * have to add 1 for the filesystem itself that we're
- * moving
- */
- fs_cnt++;
-
- err = zap_lookup(os, dd->dd_object,
- DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
- &ss_cnt);
- if (err != ENOENT && err != 0) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (err);
- }
- }
-
- /* no rename into our descendant */
- if (closest_common_ancestor(dd, newparent) == dd) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (SET_ERROR(EINVAL));
- }
-
- error = dsl_dir_transfer_possible(dd->dd_parent,
- newparent, fs_cnt, ss_cnt, myspace, ddra->ddra_cred);
- if (error != 0) {
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (error);
- }
- }
-
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
- return (0);
-}
-
-static void
-dsl_dir_rename_sync(void *arg, dmu_tx_t *tx)
-{
- dsl_dir_rename_arg_t *ddra = arg;
- dsl_pool_t *dp = dmu_tx_pool(tx);
- dsl_dir_t *dd, *newparent;
- const char *mynewname;
- int error;
- objset_t *mos = dp->dp_meta_objset;
-
- VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL));
- VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent,
- &mynewname));
-
- /* Log this before we change the name. */
- spa_history_log_internal_dd(dd, "rename", tx,
- "-> %s", ddra->ddra_newname);
-
- if (newparent != dd->dd_parent) {
- objset_t *os = dd->dd_pool->dp_meta_objset;
- uint64_t fs_cnt = 0;
- uint64_t ss_cnt = 0;
-
- /*
- * We already made sure the dd counts were initialized in the
- * check function.
- */
- if (spa_feature_is_active(dp->dp_spa,
- SPA_FEATURE_FS_SS_LIMIT)) {
- VERIFY0(zap_lookup(os, dd->dd_object,
- DD_FIELD_FILESYSTEM_COUNT, sizeof (fs_cnt), 1,
- &fs_cnt));
- /* add 1 for the filesystem itself that we're moving */
- fs_cnt++;
-
- VERIFY0(zap_lookup(os, dd->dd_object,
- DD_FIELD_SNAPSHOT_COUNT, sizeof (ss_cnt), 1,
- &ss_cnt));
- }
-
- dsl_fs_ss_count_adjust(dd->dd_parent, -fs_cnt,
- DD_FIELD_FILESYSTEM_COUNT, tx);
- dsl_fs_ss_count_adjust(newparent, fs_cnt,
- DD_FIELD_FILESYSTEM_COUNT, tx);
-
- dsl_fs_ss_count_adjust(dd->dd_parent, -ss_cnt,
- DD_FIELD_SNAPSHOT_COUNT, tx);
- dsl_fs_ss_count_adjust(newparent, ss_cnt,
- DD_FIELD_SNAPSHOT_COUNT, tx);
-
- dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
- -dsl_dir_phys(dd)->dd_used_bytes,
- -dsl_dir_phys(dd)->dd_compressed_bytes,
- -dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
- dsl_dir_diduse_space(newparent, DD_USED_CHILD,
- dsl_dir_phys(dd)->dd_used_bytes,
- dsl_dir_phys(dd)->dd_compressed_bytes,
- dsl_dir_phys(dd)->dd_uncompressed_bytes, tx);
-
- if (dsl_dir_phys(dd)->dd_reserved >
- dsl_dir_phys(dd)->dd_used_bytes) {
- uint64_t unused_rsrv = dsl_dir_phys(dd)->dd_reserved -
- dsl_dir_phys(dd)->dd_used_bytes;
-
- dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
- -unused_rsrv, 0, 0, tx);
- dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV,
- unused_rsrv, 0, 0, tx);
- }
- }
-
- dmu_buf_will_dirty(dd->dd_dbuf, tx);
-
- /* remove from old parent zapobj */
- error = zap_remove(mos,
- dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj,
- dd->dd_myname, tx);
- ASSERT0(error);
-
- (void) strlcpy(dd->dd_myname, mynewname,
- sizeof (dd->dd_myname));
- dsl_dir_rele(dd->dd_parent, dd);
- dsl_dir_phys(dd)->dd_parent_obj = newparent->dd_object;
- VERIFY0(dsl_dir_hold_obj(dp,
- newparent->dd_object, NULL, dd, &dd->dd_parent));
-
- /* add to new parent zapobj */
- VERIFY0(zap_add(mos, dsl_dir_phys(newparent)->dd_child_dir_zapobj,
- dd->dd_myname, 8, 1, &dd->dd_object, tx));
-
- zvol_rename_minors(dp->dp_spa, ddra->ddra_oldname,
- ddra->ddra_newname, B_TRUE);
-
- dsl_prop_notify_all(dd);
-
- dsl_dir_rele(newparent, FTAG);
- dsl_dir_rele(dd, FTAG);
-}
-
-int
-dsl_dir_rename(const char *oldname, const char *newname)
-{
- dsl_dir_rename_arg_t ddra;
-
- ddra.ddra_oldname = oldname;
- ddra.ddra_newname = newname;
- ddra.ddra_cred = CRED();
-
- return (dsl_sync_task(oldname,
- dsl_dir_rename_check, dsl_dir_rename_sync, &ddra,
- 3, ZFS_SPACE_CHECK_RESERVED));
-}
-
-int
-dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
- uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *cr)
-{
- dsl_dir_t *ancestor;
- int64_t adelta;
- uint64_t avail;
- int err;
-
- ancestor = closest_common_ancestor(sdd, tdd);
- adelta = would_change(sdd, -space, ancestor);
- avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
- if (avail < space)
- return (SET_ERROR(ENOSPC));
-
- err = dsl_fs_ss_limit_check(tdd, fs_cnt, ZFS_PROP_FILESYSTEM_LIMIT,
- ancestor, cr);
- if (err != 0)
- return (err);
- err = dsl_fs_ss_limit_check(tdd, ss_cnt, ZFS_PROP_SNAPSHOT_LIMIT,
- ancestor, cr);
- if (err != 0)
- return (err);
-
- return (0);
-}
-
-timestruc_t
-dsl_dir_snap_cmtime(dsl_dir_t *dd)
-{
- timestruc_t t;
-
- mutex_enter(&dd->dd_lock);
- t = dd->dd_snap_cmtime;
- mutex_exit(&dd->dd_lock);
-
- return (t);
-}
-
-void
-dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
-{
- timestruc_t t;
-
- gethrestime(&t);
- mutex_enter(&dd->dd_lock);
- dd->dd_snap_cmtime = t;
- mutex_exit(&dd->dd_lock);
-}
-
-void
-dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx)
-{
- objset_t *mos = dd->dd_pool->dp_meta_objset;
- dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
-}
-
-boolean_t
-dsl_dir_is_zapified(dsl_dir_t *dd)
-{
- dmu_object_info_t doi;
-
- dmu_object_info_from_db(dd->dd_dbuf, &doi);
- return (doi.doi_type == DMU_OTN_ZAP_METADATA);
-}
-
-#if defined(_KERNEL) && defined(HAVE_SPL)
-EXPORT_SYMBOL(dsl_dir_set_quota);
-EXPORT_SYMBOL(dsl_dir_set_reservation);
-#endif
projects / mirror_ubuntu-bionic-kernel.git / blobdiff