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dsl_deleg.c

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * 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.
 */

/* #pragma ident  "%Z%%M%     %I%   %E% SMI" */

#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/spa_impl.h>
#include <sys/zio_checksum.h> /* for the default checksum value */
#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, cred_t *cr, 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_internal_log(LOG_DS_PERM_UPDATE,
                      dd->dd_pool->dp_spa, tx, cr,
                      "%s %s dataset = %llu", whokey, perm,
                      dd->dd_phys->dd_head_dataset_obj);
            }
      }
}

static void
dsl_deleg_unset_sync(void *arg1, void *arg2, cred_t *cr, 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_internal_log(LOG_DS_PERM_WHO_REMOVE,
                      dd->dd_pool->dp_spa, tx, cr,
                      "%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_internal_log(LOG_DS_PERM_REMOVE,
                      dd->dd_pool->dp_spa, tx, cr,
                      "%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(const char *dsname, const char *perm, cred_t *cr)
{
      dsl_dataset_t *ds;
      dsl_dir_t *dd;
      dsl_pool_t *dp;
      void *cookie;
      int   error;
      char  checkflag = ZFS_DELEG_LOCAL;
      objset_t *mos;
      avl_tree_t permsets;
      perm_set_t *setnode;

      error = dsl_dataset_hold(dsname, FTAG, &ds);
      if (error)
            return (error);

      dp = ds->ds_dir->dd_pool;
      mos = dp->dp_meta_objset;

      if (dsl_delegation_on(mos) == B_FALSE) {
            dsl_dataset_rele(ds, FTAG);
            return (ECANCELED);
      }

      if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
          SPA_VERSION_DELEGATED_PERMS) {
            dsl_dataset_rele(ds, FTAG);
            return (EPERM);
      }

      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) != 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);
      dsl_dataset_rele(ds, FTAG);

      cookie = NULL;
      while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
            kmem_free(setnode, sizeof (perm_set_t));

      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 (os->os->os_spa->spa_delegation);
}

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