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-rw-r--r--uts/common/fs/zfs/dsl_deleg.c746
1 files changed, 746 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/dsl_deleg.c b/uts/common/fs/zfs/dsl_deleg.c
new file mode 100644
index 000000000000..529fb052fa75
--- /dev/null
+++ b/uts/common/fs/zfs/dsl_deleg.c
@@ -0,0 +1,746 @@
+/*
+ * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+/*
+ * DSL permissions are stored in a two level zap attribute
+ * mechanism. The first level identifies the "class" of
+ * entry. The class is identified by the first 2 letters of
+ * the attribute. The second letter "l" or "d" identifies whether
+ * it is a local or descendent permission. The first letter
+ * identifies the type of entry.
+ *
+ * ul$<id> identifies permissions granted locally for this userid.
+ * ud$<id> identifies permissions granted on descendent datasets for
+ * this userid.
+ * Ul$<id> identifies permission sets granted locally for this userid.
+ * Ud$<id> identifies permission sets granted on descendent datasets for
+ * this userid.
+ * gl$<id> identifies permissions granted locally for this groupid.
+ * gd$<id> identifies permissions granted on descendent datasets for
+ * this groupid.
+ * Gl$<id> identifies permission sets granted locally for this groupid.
+ * Gd$<id> identifies permission sets granted on descendent datasets for
+ * this groupid.
+ * el$ identifies permissions granted locally for everyone.
+ * ed$ identifies permissions granted on descendent datasets
+ * for everyone.
+ * El$ identifies permission sets granted locally for everyone.
+ * Ed$ identifies permission sets granted to descendent datasets for
+ * everyone.
+ * c-$ identifies permission to create at dataset creation time.
+ * C-$ identifies permission sets to grant locally at dataset creation
+ * time.
+ * s-$@<name> permissions defined in specified set @<name>
+ * S-$@<name> Sets defined in named set @<name>
+ *
+ * Each of the above entities points to another zap attribute that contains one
+ * attribute for each allowed permission, such as create, destroy,...
+ * All of the "upper" case class types will specify permission set names
+ * rather than permissions.
+ *
+ * Basically it looks something like this:
+ * ul$12 -> ZAP OBJ -> permissions...
+ *
+ * The ZAP OBJ is referred to as the jump object.
+ */
+
+#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/spa.h>
+#include <sys/zap.h>
+#include <sys/fs/zfs.h>
+#include <sys/cred.h>
+#include <sys/sunddi.h>
+
+#include "zfs_deleg.h"
+
+/*
+ * Validate that user is allowed to delegate specified permissions.
+ *
+ * In order to delegate "create" you must have "create"
+ * and "allow".
+ */
+int
+dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
+{
+ nvpair_t *whopair = NULL;
+ int error;
+
+ if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
+ return (error);
+
+ while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+ nvlist_t *perms;
+ nvpair_t *permpair = NULL;
+
+ VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
+
+ while (permpair = nvlist_next_nvpair(perms, permpair)) {
+ const char *perm = nvpair_name(permpair);
+
+ if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
+ return (EPERM);
+
+ if ((error = dsl_deleg_access(ddname, perm, cr)) != 0)
+ return (error);
+ }
+ }
+ return (0);
+}
+
+/*
+ * Validate that user is allowed to unallow specified permissions. They
+ * must have the 'allow' permission, and even then can only unallow
+ * perms for their uid.
+ */
+int
+dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
+{
+ nvpair_t *whopair = NULL;
+ int error;
+ char idstr[32];
+
+ if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
+ return (error);
+
+ (void) snprintf(idstr, sizeof (idstr), "%lld",
+ (longlong_t)crgetuid(cr));
+
+ while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+ zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
+
+ if (type != ZFS_DELEG_USER &&
+ type != ZFS_DELEG_USER_SETS)
+ return (EPERM);
+
+ if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
+ return (EPERM);
+ }
+ return (0);
+}
+
+static void
+dsl_deleg_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ nvlist_t *nvp = arg2;
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ nvpair_t *whopair = NULL;
+ uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
+
+ if (zapobj == 0) {
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+ zapobj = dd->dd_phys->dd_deleg_zapobj = zap_create(mos,
+ DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
+ }
+
+ while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+ const char *whokey = nvpair_name(whopair);
+ nvlist_t *perms;
+ nvpair_t *permpair = NULL;
+ uint64_t jumpobj;
+
+ VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
+
+ if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0) {
+ jumpobj = zap_create(mos, DMU_OT_DSL_PERMS,
+ DMU_OT_NONE, 0, tx);
+ VERIFY(zap_update(mos, zapobj,
+ whokey, 8, 1, &jumpobj, tx) == 0);
+ }
+
+ while (permpair = nvlist_next_nvpair(perms, permpair)) {
+ const char *perm = nvpair_name(permpair);
+ uint64_t n = 0;
+
+ VERIFY(zap_update(mos, jumpobj,
+ perm, 8, 1, &n, tx) == 0);
+ spa_history_log_internal(LOG_DS_PERM_UPDATE,
+ dd->dd_pool->dp_spa, tx,
+ "%s %s dataset = %llu", whokey, perm,
+ dd->dd_phys->dd_head_dataset_obj);
+ }
+ }
+}
+
+static void
+dsl_deleg_unset_sync(void *arg1, void *arg2, dmu_tx_t *tx)
+{
+ dsl_dir_t *dd = arg1;
+ nvlist_t *nvp = arg2;
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ nvpair_t *whopair = NULL;
+ uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
+
+ if (zapobj == 0)
+ return;
+
+ while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+ const char *whokey = nvpair_name(whopair);
+ nvlist_t *perms;
+ nvpair_t *permpair = NULL;
+ uint64_t jumpobj;
+
+ if (nvpair_value_nvlist(whopair, &perms) != 0) {
+ if (zap_lookup(mos, zapobj, whokey, 8,
+ 1, &jumpobj) == 0) {
+ (void) zap_remove(mos, zapobj, whokey, tx);
+ VERIFY(0 == zap_destroy(mos, jumpobj, tx));
+ }
+ spa_history_log_internal(LOG_DS_PERM_WHO_REMOVE,
+ dd->dd_pool->dp_spa, tx,
+ "%s dataset = %llu", whokey,
+ dd->dd_phys->dd_head_dataset_obj);
+ continue;
+ }
+
+ if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
+ continue;
+
+ while (permpair = nvlist_next_nvpair(perms, permpair)) {
+ const char *perm = nvpair_name(permpair);
+ uint64_t n = 0;
+
+ (void) zap_remove(mos, jumpobj, perm, tx);
+ if (zap_count(mos, jumpobj, &n) == 0 && n == 0) {
+ (void) zap_remove(mos, zapobj,
+ whokey, tx);
+ VERIFY(0 == zap_destroy(mos,
+ jumpobj, tx));
+ }
+ spa_history_log_internal(LOG_DS_PERM_REMOVE,
+ dd->dd_pool->dp_spa, tx,
+ "%s %s dataset = %llu", whokey, perm,
+ dd->dd_phys->dd_head_dataset_obj);
+ }
+ }
+}
+
+int
+dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
+{
+ dsl_dir_t *dd;
+ int error;
+ nvpair_t *whopair = NULL;
+ int blocks_modified = 0;
+
+ error = dsl_dir_open(ddname, FTAG, &dd, NULL);
+ if (error)
+ return (error);
+
+ if (spa_version(dmu_objset_spa(dd->dd_pool->dp_meta_objset)) <
+ SPA_VERSION_DELEGATED_PERMS) {
+ dsl_dir_close(dd, FTAG);
+ return (ENOTSUP);
+ }
+
+ while (whopair = nvlist_next_nvpair(nvp, whopair))
+ blocks_modified++;
+
+ error = dsl_sync_task_do(dd->dd_pool, NULL,
+ unset ? dsl_deleg_unset_sync : dsl_deleg_set_sync,
+ dd, nvp, blocks_modified);
+ dsl_dir_close(dd, FTAG);
+
+ return (error);
+}
+
+/*
+ * Find all 'allow' permissions from a given point and then continue
+ * traversing up to the root.
+ *
+ * This function constructs an nvlist of nvlists.
+ * each setpoint is an nvlist composed of an nvlist of an nvlist
+ * of the individual * users/groups/everyone/create
+ * permissions.
+ *
+ * The nvlist will look like this.
+ *
+ * { source fsname -> { whokeys { permissions,...}, ...}}
+ *
+ * The fsname nvpairs will be arranged in a bottom up order. For example,
+ * if we have the following structure a/b/c then the nvpairs for the fsnames
+ * will be ordered a/b/c, a/b, a.
+ */
+int
+dsl_deleg_get(const char *ddname, nvlist_t **nvp)
+{
+ dsl_dir_t *dd, *startdd;
+ dsl_pool_t *dp;
+ int error;
+ objset_t *mos;
+
+ error = dsl_dir_open(ddname, FTAG, &startdd, NULL);
+ if (error)
+ return (error);
+
+ dp = startdd->dd_pool;
+ mos = dp->dp_meta_objset;
+
+ VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
+
+ rw_enter(&dp->dp_config_rwlock, RW_READER);
+ for (dd = startdd; dd != NULL; dd = dd->dd_parent) {
+ zap_cursor_t basezc;
+ zap_attribute_t baseza;
+ nvlist_t *sp_nvp;
+ uint64_t n;
+ char source[MAXNAMELEN];
+
+ if (dd->dd_phys->dd_deleg_zapobj &&
+ (zap_count(mos, dd->dd_phys->dd_deleg_zapobj,
+ &n) == 0) && n) {
+ VERIFY(nvlist_alloc(&sp_nvp,
+ NV_UNIQUE_NAME, KM_SLEEP) == 0);
+ } else {
+ continue;
+ }
+
+ for (zap_cursor_init(&basezc, mos,
+ dd->dd_phys->dd_deleg_zapobj);
+ zap_cursor_retrieve(&basezc, &baseza) == 0;
+ zap_cursor_advance(&basezc)) {
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ nvlist_t *perms_nvp;
+
+ ASSERT(baseza.za_integer_length == 8);
+ ASSERT(baseza.za_num_integers == 1);
+
+ VERIFY(nvlist_alloc(&perms_nvp,
+ NV_UNIQUE_NAME, KM_SLEEP) == 0);
+ for (zap_cursor_init(&zc, mos, baseza.za_first_integer);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ VERIFY(nvlist_add_boolean(perms_nvp,
+ za.za_name) == 0);
+ }
+ zap_cursor_fini(&zc);
+ VERIFY(nvlist_add_nvlist(sp_nvp, baseza.za_name,
+ perms_nvp) == 0);
+ nvlist_free(perms_nvp);
+ }
+
+ zap_cursor_fini(&basezc);
+
+ dsl_dir_name(dd, source);
+ VERIFY(nvlist_add_nvlist(*nvp, source, sp_nvp) == 0);
+ nvlist_free(sp_nvp);
+ }
+ rw_exit(&dp->dp_config_rwlock);
+
+ dsl_dir_close(startdd, FTAG);
+ return (0);
+}
+
+/*
+ * Routines for dsl_deleg_access() -- access checking.
+ */
+typedef struct perm_set {
+ avl_node_t p_node;
+ boolean_t p_matched;
+ char p_setname[ZFS_MAX_DELEG_NAME];
+} perm_set_t;
+
+static int
+perm_set_compare(const void *arg1, const void *arg2)
+{
+ const perm_set_t *node1 = arg1;
+ const perm_set_t *node2 = arg2;
+ int val;
+
+ val = strcmp(node1->p_setname, node2->p_setname);
+ if (val == 0)
+ return (0);
+ return (val > 0 ? 1 : -1);
+}
+
+/*
+ * Determine whether a specified permission exists.
+ *
+ * First the base attribute has to be retrieved. i.e. ul$12
+ * Once the base object has been retrieved the actual permission
+ * is lookup up in the zap object the base object points to.
+ *
+ * Return 0 if permission exists, ENOENT if there is no whokey, EPERM if
+ * there is no perm in that jumpobj.
+ */
+static int
+dsl_check_access(objset_t *mos, uint64_t zapobj,
+ char type, char checkflag, void *valp, const char *perm)
+{
+ int error;
+ uint64_t jumpobj, zero;
+ char whokey[ZFS_MAX_DELEG_NAME];
+
+ zfs_deleg_whokey(whokey, type, checkflag, valp);
+ error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
+ if (error == 0) {
+ error = zap_lookup(mos, jumpobj, perm, 8, 1, &zero);
+ if (error == ENOENT)
+ error = EPERM;
+ }
+ return (error);
+}
+
+/*
+ * check a specified user/group for a requested permission
+ */
+static int
+dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
+ int checkflag, cred_t *cr)
+{
+ const gid_t *gids;
+ int ngids;
+ int i;
+ uint64_t id;
+
+ /* check for user */
+ id = crgetuid(cr);
+ if (dsl_check_access(mos, zapobj,
+ ZFS_DELEG_USER, checkflag, &id, perm) == 0)
+ return (0);
+
+ /* check for users primary group */
+ id = crgetgid(cr);
+ if (dsl_check_access(mos, zapobj,
+ ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
+ return (0);
+
+ /* check for everyone entry */
+ id = -1;
+ if (dsl_check_access(mos, zapobj,
+ ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
+ return (0);
+
+ /* check each supplemental group user is a member of */
+ ngids = crgetngroups(cr);
+ gids = crgetgroups(cr);
+ for (i = 0; i != ngids; i++) {
+ id = gids[i];
+ if (dsl_check_access(mos, zapobj,
+ ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
+ return (0);
+ }
+
+ return (EPERM);
+}
+
+/*
+ * Iterate over the sets specified in the specified zapobj
+ * and load them into the permsets avl tree.
+ */
+static int
+dsl_load_sets(objset_t *mos, uint64_t zapobj,
+ char type, char checkflag, void *valp, avl_tree_t *avl)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ perm_set_t *permnode;
+ avl_index_t idx;
+ uint64_t jumpobj;
+ int error;
+ char whokey[ZFS_MAX_DELEG_NAME];
+
+ zfs_deleg_whokey(whokey, type, checkflag, valp);
+
+ error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
+ if (error != 0)
+ return (error);
+
+ for (zap_cursor_init(&zc, mos, jumpobj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ permnode = kmem_alloc(sizeof (perm_set_t), KM_SLEEP);
+ (void) strlcpy(permnode->p_setname, za.za_name,
+ sizeof (permnode->p_setname));
+ permnode->p_matched = B_FALSE;
+
+ if (avl_find(avl, permnode, &idx) == NULL) {
+ avl_insert(avl, permnode, idx);
+ } else {
+ kmem_free(permnode, sizeof (perm_set_t));
+ }
+ }
+ zap_cursor_fini(&zc);
+ return (0);
+}
+
+/*
+ * Load all permissions user based on cred belongs to.
+ */
+static void
+dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
+ char checkflag, cred_t *cr)
+{
+ const gid_t *gids;
+ int ngids, i;
+ uint64_t id;
+
+ id = crgetuid(cr);
+ (void) dsl_load_sets(mos, zapobj,
+ ZFS_DELEG_USER_SETS, checkflag, &id, avl);
+
+ id = crgetgid(cr);
+ (void) dsl_load_sets(mos, zapobj,
+ ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
+
+ (void) dsl_load_sets(mos, zapobj,
+ ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
+
+ ngids = crgetngroups(cr);
+ gids = crgetgroups(cr);
+ for (i = 0; i != ngids; i++) {
+ id = gids[i];
+ (void) dsl_load_sets(mos, zapobj,
+ ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
+ }
+}
+
+/*
+ * Check if user has requested permission.
+ */
+int
+dsl_deleg_access_impl(dsl_dataset_t *ds, const char *perm, cred_t *cr)
+{
+ dsl_dir_t *dd;
+ dsl_pool_t *dp;
+ void *cookie;
+ int error;
+ char checkflag;
+ objset_t *mos;
+ avl_tree_t permsets;
+ perm_set_t *setnode;
+
+ dp = ds->ds_dir->dd_pool;
+ mos = dp->dp_meta_objset;
+
+ if (dsl_delegation_on(mos) == B_FALSE)
+ return (ECANCELED);
+
+ if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
+ SPA_VERSION_DELEGATED_PERMS)
+ return (EPERM);
+
+ if (dsl_dataset_is_snapshot(ds)) {
+ /*
+ * Snapshots are treated as descendents only,
+ * local permissions do not apply.
+ */
+ checkflag = ZFS_DELEG_DESCENDENT;
+ } else {
+ checkflag = ZFS_DELEG_LOCAL;
+ }
+
+ avl_create(&permsets, perm_set_compare, sizeof (perm_set_t),
+ offsetof(perm_set_t, p_node));
+
+ rw_enter(&dp->dp_config_rwlock, RW_READER);
+ for (dd = ds->ds_dir; dd != NULL; dd = dd->dd_parent,
+ checkflag = ZFS_DELEG_DESCENDENT) {
+ uint64_t zapobj;
+ boolean_t expanded;
+
+ /*
+ * If not in global zone then make sure
+ * the zoned property is set
+ */
+ if (!INGLOBALZONE(curproc)) {
+ uint64_t zoned;
+
+ if (dsl_prop_get_dd(dd,
+ zfs_prop_to_name(ZFS_PROP_ZONED),
+ 8, 1, &zoned, NULL, B_FALSE) != 0)
+ break;
+ if (!zoned)
+ break;
+ }
+ zapobj = dd->dd_phys->dd_deleg_zapobj;
+
+ if (zapobj == 0)
+ continue;
+
+ dsl_load_user_sets(mos, zapobj, &permsets, checkflag, cr);
+again:
+ expanded = B_FALSE;
+ for (setnode = avl_first(&permsets); setnode;
+ setnode = AVL_NEXT(&permsets, setnode)) {
+ if (setnode->p_matched == B_TRUE)
+ continue;
+
+ /* See if this set directly grants this permission */
+ error = dsl_check_access(mos, zapobj,
+ ZFS_DELEG_NAMED_SET, 0, setnode->p_setname, perm);
+ if (error == 0)
+ goto success;
+ if (error == EPERM)
+ setnode->p_matched = B_TRUE;
+
+ /* See if this set includes other sets */
+ error = dsl_load_sets(mos, zapobj,
+ ZFS_DELEG_NAMED_SET_SETS, 0,
+ setnode->p_setname, &permsets);
+ if (error == 0)
+ setnode->p_matched = expanded = B_TRUE;
+ }
+ /*
+ * If we expanded any sets, that will define more sets,
+ * which we need to check.
+ */
+ if (expanded)
+ goto again;
+
+ error = dsl_check_user_access(mos, zapobj, perm, checkflag, cr);
+ if (error == 0)
+ goto success;
+ }
+ error = EPERM;
+success:
+ rw_exit(&dp->dp_config_rwlock);
+
+ cookie = NULL;
+ while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
+ kmem_free(setnode, sizeof (perm_set_t));
+
+ return (error);
+}
+
+int
+dsl_deleg_access(const char *dsname, const char *perm, cred_t *cr)
+{
+ dsl_dataset_t *ds;
+ int error;
+
+ error = dsl_dataset_hold(dsname, FTAG, &ds);
+ if (error)
+ return (error);
+
+ error = dsl_deleg_access_impl(ds, perm, cr);
+ dsl_dataset_rele(ds, FTAG);
+
+ return (error);
+}
+
+/*
+ * Other routines.
+ */
+
+static void
+copy_create_perms(dsl_dir_t *dd, uint64_t pzapobj,
+ boolean_t dosets, uint64_t uid, dmu_tx_t *tx)
+{
+ objset_t *mos = dd->dd_pool->dp_meta_objset;
+ uint64_t jumpobj, pjumpobj;
+ uint64_t zapobj = dd->dd_phys->dd_deleg_zapobj;
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ char whokey[ZFS_MAX_DELEG_NAME];
+
+ zfs_deleg_whokey(whokey,
+ dosets ? ZFS_DELEG_CREATE_SETS : ZFS_DELEG_CREATE,
+ ZFS_DELEG_LOCAL, NULL);
+ if (zap_lookup(mos, pzapobj, whokey, 8, 1, &pjumpobj) != 0)
+ return;
+
+ if (zapobj == 0) {
+ dmu_buf_will_dirty(dd->dd_dbuf, tx);
+ zapobj = dd->dd_phys->dd_deleg_zapobj = zap_create(mos,
+ DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
+ }
+
+ zfs_deleg_whokey(whokey,
+ dosets ? ZFS_DELEG_USER_SETS : ZFS_DELEG_USER,
+ ZFS_DELEG_LOCAL, &uid);
+ if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) == ENOENT) {
+ jumpobj = zap_create(mos, DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
+ VERIFY(zap_add(mos, zapobj, whokey, 8, 1, &jumpobj, tx) == 0);
+ }
+
+ for (zap_cursor_init(&zc, mos, pjumpobj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ uint64_t zero = 0;
+ ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
+
+ VERIFY(zap_update(mos, jumpobj, za.za_name,
+ 8, 1, &zero, tx) == 0);
+ }
+ zap_cursor_fini(&zc);
+}
+
+/*
+ * set all create time permission on new dataset.
+ */
+void
+dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
+{
+ dsl_dir_t *dd;
+ uint64_t uid = crgetuid(cr);
+
+ if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
+ SPA_VERSION_DELEGATED_PERMS)
+ return;
+
+ for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
+ uint64_t pzapobj = dd->dd_phys->dd_deleg_zapobj;
+
+ if (pzapobj == 0)
+ continue;
+
+ copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
+ copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
+ }
+}
+
+int
+dsl_deleg_destroy(objset_t *mos, uint64_t zapobj, dmu_tx_t *tx)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+
+ if (zapobj == 0)
+ return (0);
+
+ for (zap_cursor_init(&zc, mos, zapobj);
+ zap_cursor_retrieve(&zc, &za) == 0;
+ zap_cursor_advance(&zc)) {
+ ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
+ VERIFY(0 == zap_destroy(mos, za.za_first_integer, tx));
+ }
+ zap_cursor_fini(&zc);
+ VERIFY(0 == zap_destroy(mos, zapobj, tx));
+ return (0);
+}
+
+boolean_t
+dsl_delegation_on(objset_t *os)
+{
+ return (!!spa_delegation(os->os_spa));
+}