Illumos #1748: desire support for reguid in zfs

[mirror_zfs.git] / module / zfs / zfs_ioctl.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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Portions Copyright 2011 Martin Matuska
 * Portions Copyright 2012 Pawel Jakub Dawidek <pawel@dawidek.net>
 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
 */
/*
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2011 by Delphix. All rights reserved.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/buf.h>
#include <sys/modctl.h>
#include <sys/open.h>
#include <sys/file.h>
#include <sys/kmem.h>
#include <sys/conf.h>
#include <sys/cmn_err.h>
#include <sys/stat.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_znode.h>
#include <sys/zap.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/vdev.h>
#include <sys/priv_impl.h>
#include <sys/dmu.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_deleg.h>
#include <sys/dmu_objset.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>
#include <sys/policy.h>
#include <sys/zone.h>
#include <sys/nvpair.h>
#include <sys/pathname.h>
#include <sys/mount.h>
#include <sys/sdt.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_ctldir.h>
#include <sys/zfs_dir.h>
#include <sys/zfs_onexit.h>
#include <sys/zvol.h>
#include <sys/dsl_scan.h>
#include <sharefs/share.h>
#include <sys/dmu_objset.h>
#include <sys/fm/util.h>

#include <linux/miscdevice.h>

#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "zfs_deleg.h"
#include "zfs_comutil.h"

kmutex_t zfsdev_state_lock;
list_t zfsdev_state_list;

extern void zfs_init(void);
extern void zfs_fini(void);

typedef int zfs_ioc_func_t(zfs_cmd_t *);
typedef int zfs_secpolicy_func_t(zfs_cmd_t *, cred_t *);

typedef enum {
        NO_NAME,
        POOL_NAME,
        DATASET_NAME
} zfs_ioc_namecheck_t;

typedef enum {
        POOL_CHECK_NONE         = 1 << 0,
        POOL_CHECK_SUSPENDED    = 1 << 1,
        POOL_CHECK_READONLY     = 1 << 2
} zfs_ioc_poolcheck_t;

typedef struct zfs_ioc_vec {
        zfs_ioc_func_t          *zvec_func;
        zfs_secpolicy_func_t    *zvec_secpolicy;
        zfs_ioc_namecheck_t     zvec_namecheck;
        boolean_t               zvec_his_log;
        zfs_ioc_poolcheck_t     zvec_pool_check;
} zfs_ioc_vec_t;

/* This array is indexed by zfs_userquota_prop_t */
static const char *userquota_perms[] = {
        ZFS_DELEG_PERM_USERUSED,
        ZFS_DELEG_PERM_USERQUOTA,
        ZFS_DELEG_PERM_GROUPUSED,
        ZFS_DELEG_PERM_GROUPQUOTA,
};

static int zfs_ioc_userspace_upgrade(zfs_cmd_t *zc);
static int zfs_check_settable(const char *name, nvpair_t *property,
    cred_t *cr);
static int zfs_check_clearable(char *dataset, nvlist_t *props,
    nvlist_t **errors);
static int zfs_fill_zplprops_root(uint64_t, nvlist_t *, nvlist_t *,
    boolean_t *);
int zfs_set_prop_nvlist(const char *, zprop_source_t, nvlist_t *, nvlist_t **);

static void
history_str_free(char *buf)
{
        kmem_free(buf, HIS_MAX_RECORD_LEN);
}

static char *
history_str_get(zfs_cmd_t *zc)
{
        char *buf;

        if (zc->zc_history == 0)
                return (NULL);

        buf = kmem_alloc(HIS_MAX_RECORD_LEN, KM_SLEEP | KM_NODEBUG);
        if (copyinstr((void *)(uintptr_t)zc->zc_history,
            buf, HIS_MAX_RECORD_LEN, NULL) != 0) {
                history_str_free(buf);
                return (NULL);
        }

        buf[HIS_MAX_RECORD_LEN -1] = '\0';

        return (buf);
}

/*
 * Check to see if the named dataset is currently defined as bootable
 */
static boolean_t
zfs_is_bootfs(const char *name)
{
        objset_t *os;

        if (dmu_objset_hold(name, FTAG, &os) == 0) {
                boolean_t ret;
                ret = (dmu_objset_id(os) == spa_bootfs(dmu_objset_spa(os)));
                dmu_objset_rele(os, FTAG);
                return (ret);
        }
        return (B_FALSE);
}

/*
 * zfs_earlier_version
 *
 *      Return non-zero if the spa version is less than requested version.
 */
static int
zfs_earlier_version(const char *name, int version)
{
        spa_t *spa;

        if (spa_open(name, &spa, FTAG) == 0) {
                if (spa_version(spa) < version) {
                        spa_close(spa, FTAG);
                        return (1);
                }
                spa_close(spa, FTAG);
        }
        return (0);
}

/*
 * zpl_earlier_version
 *
 * Return TRUE if the ZPL version is less than requested version.
 */
static boolean_t
zpl_earlier_version(const char *name, int version)
{
        objset_t *os;
        boolean_t rc = B_TRUE;

        if (dmu_objset_hold(name, FTAG, &os) == 0) {
                uint64_t zplversion;

                if (dmu_objset_type(os) != DMU_OST_ZFS) {
                        dmu_objset_rele(os, FTAG);
                        return (B_TRUE);
                }
                /* XXX reading from non-owned objset */
                if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &zplversion) == 0)
                        rc = zplversion < version;
                dmu_objset_rele(os, FTAG);
        }
        return (rc);
}

static void
zfs_log_history(zfs_cmd_t *zc)
{
        spa_t *spa;
        char *buf;

        if ((buf = history_str_get(zc)) == NULL)
                return;

        if (spa_open(zc->zc_name, &spa, FTAG) == 0) {
                if (spa_version(spa) >= SPA_VERSION_ZPOOL_HISTORY)
                        (void) spa_history_log(spa, buf, LOG_CMD_NORMAL);
                spa_close(spa, FTAG);
        }
        history_str_free(buf);
}

/*
 * Policy for top-level read operations (list pools).  Requires no privileges,
 * and can be used in the local zone, as there is no associated dataset.
 */
/* ARGSUSED */
static int
zfs_secpolicy_none(zfs_cmd_t *zc, cred_t *cr)
{
        return (0);
}

/*
 * Policy for dataset read operations (list children, get statistics).  Requires
 * no privileges, but must be visible in the local zone.
 */
/* ARGSUSED */
static int
zfs_secpolicy_read(zfs_cmd_t *zc, cred_t *cr)
{
        if (INGLOBALZONE(curproc) ||
            zone_dataset_visible(zc->zc_name, NULL))
                return (0);

        return (ENOENT);
}

static int
zfs_dozonecheck_impl(const char *dataset, uint64_t zoned, cred_t *cr)
{
        int writable = 1;

        /*
         * The dataset must be visible by this zone -- check this first
         * so they don't see EPERM on something they shouldn't know about.
         */
        if (!INGLOBALZONE(curproc) &&
            !zone_dataset_visible(dataset, &writable))
                return (ENOENT);

        if (INGLOBALZONE(curproc)) {
                /*
                 * If the fs is zoned, only root can access it from the
                 * global zone.
                 */
                if (secpolicy_zfs(cr) && zoned)
                        return (EPERM);
        } else {
                /*
                 * If we are in a local zone, the 'zoned' property must be set.
                 */
                if (!zoned)
                        return (EPERM);

                /* must be writable by this zone */
                if (!writable)
                        return (EPERM);
        }
        return (0);
}

static int
zfs_dozonecheck(const char *dataset, cred_t *cr)
{
        uint64_t zoned;

        if (dsl_prop_get_integer(dataset, "zoned", &zoned, NULL))
                return (ENOENT);

        return (zfs_dozonecheck_impl(dataset, zoned, cr));
}

static int
zfs_dozonecheck_ds(const char *dataset, dsl_dataset_t *ds, cred_t *cr)
{
        uint64_t zoned;

        rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
        if (dsl_prop_get_ds(ds, "zoned", 8, 1, &zoned, NULL)) {
                rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
                return (ENOENT);
        }
        rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);

        return (zfs_dozonecheck_impl(dataset, zoned, cr));
}

int
zfs_secpolicy_write_perms(const char *name, const char *perm, cred_t *cr)
{
        int error;

        error = zfs_dozonecheck(name, cr);
        if (error == 0) {
                error = secpolicy_zfs(cr);
                if (error)
                        error = dsl_deleg_access(name, perm, cr);
        }
        return (error);
}

int
zfs_secpolicy_write_perms_ds(const char *name, dsl_dataset_t *ds,
    const char *perm, cred_t *cr)
{
        int error;

        error = zfs_dozonecheck_ds(name, ds, cr);
        if (error == 0) {
                error = secpolicy_zfs(cr);
                if (error)
                        error = dsl_deleg_access_impl(ds, perm, cr);
        }
        return (error);
}

/*
 * Policy for setting the security label property.
 *
 * Returns 0 for success, non-zero for access and other errors.
 */
static int
zfs_set_slabel_policy(const char *name, char *strval, cred_t *cr)
{
#ifdef HAVE_MLSLABEL
        char            ds_hexsl[MAXNAMELEN];
        bslabel_t       ds_sl, new_sl;
        boolean_t       new_default = FALSE;
        uint64_t        zoned;
        int             needed_priv = -1;
        int             error;

        /* First get the existing dataset label. */
        error = dsl_prop_get(name, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
            1, sizeof (ds_hexsl), &ds_hexsl, NULL);
        if (error)
                return (EPERM);

        if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
                new_default = TRUE;

        /* The label must be translatable */
        if (!new_default && (hexstr_to_label(strval, &new_sl) != 0))
                return (EINVAL);

        /*
         * In a non-global zone, disallow attempts to set a label that
         * doesn't match that of the zone; otherwise no other checks
         * are needed.
         */
        if (!INGLOBALZONE(curproc)) {
                if (new_default || !blequal(&new_sl, CR_SL(CRED())))
                        return (EPERM);
                return (0);
        }

        /*
         * For global-zone datasets (i.e., those whose zoned property is
         * "off", verify that the specified new label is valid for the
         * global zone.
         */
        if (dsl_prop_get_integer(name,
            zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
                return (EPERM);
        if (!zoned) {
                if (zfs_check_global_label(name, strval) != 0)
                        return (EPERM);
        }

        /*
         * If the existing dataset label is nondefault, check if the
         * dataset is mounted (label cannot be changed while mounted).
         * Get the zfs_sb_t; if there isn't one, then the dataset isn't
         * mounted (or isn't a dataset, doesn't exist, ...).
         */
        if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) != 0) {
                objset_t *os;
                static char *setsl_tag = "setsl_tag";

                /*
                 * Try to own the dataset; abort if there is any error,
                 * (e.g., already mounted, in use, or other error).
                 */
                error = dmu_objset_own(name, DMU_OST_ZFS, B_TRUE,
                    setsl_tag, &os);
                if (error)
                        return (EPERM);

                dmu_objset_disown(os, setsl_tag);

                if (new_default) {
                        needed_priv = PRIV_FILE_DOWNGRADE_SL;
                        goto out_check;
                }

                if (hexstr_to_label(strval, &new_sl) != 0)
                        return (EPERM);

                if (blstrictdom(&ds_sl, &new_sl))
                        needed_priv = PRIV_FILE_DOWNGRADE_SL;
                else if (blstrictdom(&new_sl, &ds_sl))
                        needed_priv = PRIV_FILE_UPGRADE_SL;
        } else {
                /* dataset currently has a default label */
                if (!new_default)
                        needed_priv = PRIV_FILE_UPGRADE_SL;
        }

out_check:
        if (needed_priv != -1)
                return (PRIV_POLICY(cr, needed_priv, B_FALSE, EPERM, NULL));
        return (0);
#else
        return ENOTSUP;
#endif /* HAVE_MLSLABEL */
}

static int
zfs_secpolicy_setprop(const char *dsname, zfs_prop_t prop, nvpair_t *propval,
    cred_t *cr)
{
        char *strval;

        /*
         * Check permissions for special properties.
         */
        switch (prop) {
        default:
                break;
        case ZFS_PROP_ZONED:
                /*
                 * Disallow setting of 'zoned' from within a local zone.
                 */
                if (!INGLOBALZONE(curproc))
                        return (EPERM);
                break;

        case ZFS_PROP_QUOTA:
                if (!INGLOBALZONE(curproc)) {
                        uint64_t zoned;
                        char setpoint[MAXNAMELEN];
                        /*
                         * Unprivileged users are allowed to modify the
                         * quota on things *under* (ie. contained by)
                         * the thing they own.
                         */
                        if (dsl_prop_get_integer(dsname, "zoned", &zoned,
                            setpoint))
                                return (EPERM);
                        if (!zoned || strlen(dsname) <= strlen(setpoint))
                                return (EPERM);
                }
                break;

        case ZFS_PROP_MLSLABEL:
                if (!is_system_labeled())
                        return (EPERM);

                if (nvpair_value_string(propval, &strval) == 0) {
                        int err;

                        err = zfs_set_slabel_policy(dsname, strval, CRED());
                        if (err != 0)
                                return (err);
                }
                break;
        }

        return (zfs_secpolicy_write_perms(dsname, zfs_prop_to_name(prop), cr));
}

int
zfs_secpolicy_fsacl(zfs_cmd_t *zc, cred_t *cr)
{
        int error;

        error = zfs_dozonecheck(zc->zc_name, cr);
        if (error)
                return (error);

        /*
         * permission to set permissions will be evaluated later in
         * dsl_deleg_can_allow()
         */
        return (0);
}

int
zfs_secpolicy_rollback(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_ROLLBACK, cr));
}

int
zfs_secpolicy_send(zfs_cmd_t *zc, cred_t *cr)
{
        spa_t *spa;
        dsl_pool_t *dp;
        dsl_dataset_t *ds;
        char *cp;
        int error;

        /*
         * Generate the current snapshot name from the given objsetid, then
         * use that name for the secpolicy/zone checks.
         */
        cp = strchr(zc->zc_name, '@');
        if (cp == NULL)
                return (EINVAL);
        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error)
                return (error);

        dp = spa_get_dsl(spa);
        rw_enter(&dp->dp_config_rwlock, RW_READER);
        error = dsl_dataset_hold_obj(dp, zc->zc_sendobj, FTAG, &ds);
        rw_exit(&dp->dp_config_rwlock);
        spa_close(spa, FTAG);
        if (error)
                return (error);

        dsl_dataset_name(ds, zc->zc_name);

        error = zfs_secpolicy_write_perms_ds(zc->zc_name, ds,
            ZFS_DELEG_PERM_SEND, cr);
        dsl_dataset_rele(ds, FTAG);

        return (error);
}

#ifdef HAVE_SMB_SHARE
static int
zfs_secpolicy_deleg_share(zfs_cmd_t *zc, cred_t *cr)
{
        vnode_t *vp;
        int error;

        if ((error = lookupname(zc->zc_value, UIO_SYSSPACE,
            NO_FOLLOW, NULL, &vp)) != 0)
                return (error);

        /* Now make sure mntpnt and dataset are ZFS */

        if (vp->v_vfsp->vfs_fstype != zfsfstype ||
            (strcmp((char *)refstr_value(vp->v_vfsp->vfs_resource),
            zc->zc_name) != 0)) {
                VN_RELE(vp);
                return (EPERM);
        }

        VN_RELE(vp);
        return (dsl_deleg_access(zc->zc_name,
            ZFS_DELEG_PERM_SHARE, cr));
}
#endif /* HAVE_SMB_SHARE */

int
zfs_secpolicy_share(zfs_cmd_t *zc, cred_t *cr)
{
#ifdef HAVE_SMB_SHARE
        if (!INGLOBALZONE(curproc))
                return (EPERM);

        if (secpolicy_nfs(cr) == 0) {
                return (0);
        } else {
                return (zfs_secpolicy_deleg_share(zc, cr));
        }
#else
        return (ENOTSUP);
#endif /* HAVE_SMB_SHARE */
}

int
zfs_secpolicy_smb_acl(zfs_cmd_t *zc, cred_t *cr)
{
#ifdef HAVE_SMB_SHARE
        if (!INGLOBALZONE(curproc))
                return (EPERM);

        if (secpolicy_smb(cr) == 0) {
                return (0);
        } else {
                return (zfs_secpolicy_deleg_share(zc, cr));
        }
#else
        return (ENOTSUP);
#endif /* HAVE_SMB_SHARE */
}

static int
zfs_get_parent(const char *datasetname, char *parent, int parentsize)
{
        char *cp;

        /*
         * Remove the @bla or /bla from the end of the name to get the parent.
         */
        (void) strncpy(parent, datasetname, parentsize);
        cp = strrchr(parent, '@');
        if (cp != NULL) {
                cp[0] = '\0';
        } else {
                cp = strrchr(parent, '/');
                if (cp == NULL)
                        return (ENOENT);
                cp[0] = '\0';
        }

        return (0);
}

int
zfs_secpolicy_destroy_perms(const char *name, cred_t *cr)
{
        int error;

        if ((error = zfs_secpolicy_write_perms(name,
            ZFS_DELEG_PERM_MOUNT, cr)) != 0)
                return (error);

        return (zfs_secpolicy_write_perms(name, ZFS_DELEG_PERM_DESTROY, cr));
}

static int
zfs_secpolicy_destroy(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_destroy_perms(zc->zc_name, cr));
}

/*
 * Destroying snapshots with delegated permissions requires
 * descendent mount and destroy permissions.
 * Reassemble the full filesystem@snap name so dsl_deleg_access()
 * can do the correct permission check.
 *
 * Since this routine is used when doing a recursive destroy of snapshots
 * and destroying snapshots requires descendent permissions, a successfull
 * check of the top level snapshot applies to snapshots of all descendent
 * datasets as well.
 *
 * The target snapshot may not exist when doing a recursive destroy.
 * In this case fallback to permissions of the parent dataset.
 */
static int
zfs_secpolicy_destroy_snaps(zfs_cmd_t *zc, cred_t *cr)
{
        int error;
        char *dsname;

        dsname = kmem_asprintf("%s@%s", zc->zc_name, zc->zc_value);

        error = zfs_secpolicy_destroy_perms(dsname, cr);
        if (error == ENOENT)
                error = zfs_secpolicy_destroy_perms(zc->zc_name, cr);

        strfree(dsname);
        return (error);
}

int
zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr)
{
        char    parentname[MAXNAMELEN];
        int     error;

        if ((error = zfs_secpolicy_write_perms(from,
            ZFS_DELEG_PERM_RENAME, cr)) != 0)
                return (error);

        if ((error = zfs_secpolicy_write_perms(from,
            ZFS_DELEG_PERM_MOUNT, cr)) != 0)
                return (error);

        if ((error = zfs_get_parent(to, parentname,
            sizeof (parentname))) != 0)
                return (error);

        if ((error = zfs_secpolicy_write_perms(parentname,
            ZFS_DELEG_PERM_CREATE, cr)) != 0)
                return (error);

        if ((error = zfs_secpolicy_write_perms(parentname,
            ZFS_DELEG_PERM_MOUNT, cr)) != 0)
                return (error);

        return (error);
}

static int
zfs_secpolicy_rename(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_rename_perms(zc->zc_name, zc->zc_value, cr));
}

static int
zfs_secpolicy_promote(zfs_cmd_t *zc, cred_t *cr)
{
        char    parentname[MAXNAMELEN];
        objset_t *clone;
        int error;

        error = zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_PROMOTE, cr);
        if (error)
                return (error);

        error = dmu_objset_hold(zc->zc_name, FTAG, &clone);

        if (error == 0) {
                dsl_dataset_t *pclone = NULL;
                dsl_dir_t *dd;
                dd = clone->os_dsl_dataset->ds_dir;

                rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
                error = dsl_dataset_hold_obj(dd->dd_pool,
                    dd->dd_phys->dd_origin_obj, FTAG, &pclone);
                rw_exit(&dd->dd_pool->dp_config_rwlock);
                if (error) {
                        dmu_objset_rele(clone, FTAG);
                        return (error);
                }

                error = zfs_secpolicy_write_perms(zc->zc_name,
                    ZFS_DELEG_PERM_MOUNT, cr);

                dsl_dataset_name(pclone, parentname);
                dmu_objset_rele(clone, FTAG);
                dsl_dataset_rele(pclone, FTAG);
                if (error == 0)
                        error = zfs_secpolicy_write_perms(parentname,
                            ZFS_DELEG_PERM_PROMOTE, cr);
        }
        return (error);
}

static int
zfs_secpolicy_receive(zfs_cmd_t *zc, cred_t *cr)
{
        int error;

        if ((error = zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_RECEIVE, cr)) != 0)
                return (error);

        if ((error = zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_MOUNT, cr)) != 0)
                return (error);

        return (zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_CREATE, cr));
}

int
zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr)
{
        return (zfs_secpolicy_write_perms(name,
            ZFS_DELEG_PERM_SNAPSHOT, cr));
}

static int
zfs_secpolicy_snapshot(zfs_cmd_t *zc, cred_t *cr)
{

        return (zfs_secpolicy_snapshot_perms(zc->zc_name, cr));
}

static int
zfs_secpolicy_create(zfs_cmd_t *zc, cred_t *cr)
{
        char    parentname[MAXNAMELEN];
        int     error;

        if ((error = zfs_get_parent(zc->zc_name, parentname,
            sizeof (parentname))) != 0)
                return (error);

        if (zc->zc_value[0] != '\0') {
                if ((error = zfs_secpolicy_write_perms(zc->zc_value,
                    ZFS_DELEG_PERM_CLONE, cr)) != 0)
                        return (error);
        }

        if ((error = zfs_secpolicy_write_perms(parentname,
            ZFS_DELEG_PERM_CREATE, cr)) != 0)
                return (error);

        error = zfs_secpolicy_write_perms(parentname,
            ZFS_DELEG_PERM_MOUNT, cr);

        return (error);
}

/*
 * Policy for pool operations - create/destroy pools, add vdevs, etc.  Requires
 * SYS_CONFIG privilege, which is not available in a local zone.
 */
/* ARGSUSED */
static int
zfs_secpolicy_config(zfs_cmd_t *zc, cred_t *cr)
{
        if (secpolicy_sys_config(cr, B_FALSE) != 0)
                return (EPERM);

        return (0);
}

/*
 * Policy for object to name lookups.
 */
/* ARGSUSED */
static int
zfs_secpolicy_diff(zfs_cmd_t *zc, cred_t *cr)
{
        int error;

        if ((error = secpolicy_sys_config(cr, B_FALSE)) == 0)
                return (0);

        error = zfs_secpolicy_write_perms(zc->zc_name, ZFS_DELEG_PERM_DIFF, cr);
        return (error);
}

/*
 * Policy for fault injection.  Requires all privileges.
 */
/* ARGSUSED */
static int
zfs_secpolicy_inject(zfs_cmd_t *zc, cred_t *cr)
{
        return (secpolicy_zinject(cr));
}

static int
zfs_secpolicy_inherit(zfs_cmd_t *zc, cred_t *cr)
{
        zfs_prop_t prop = zfs_name_to_prop(zc->zc_value);

        if (prop == ZPROP_INVAL) {
                if (!zfs_prop_user(zc->zc_value))
                        return (EINVAL);
                return (zfs_secpolicy_write_perms(zc->zc_name,
                    ZFS_DELEG_PERM_USERPROP, cr));
        } else {
                return (zfs_secpolicy_setprop(zc->zc_name, prop,
                    NULL, cr));
        }
}

static int
zfs_secpolicy_userspace_one(zfs_cmd_t *zc, cred_t *cr)
{
        int err = zfs_secpolicy_read(zc, cr);
        if (err)
                return (err);

        if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
                return (EINVAL);

        if (zc->zc_value[0] == 0) {
                /*
                 * They are asking about a posix uid/gid.  If it's
                 * themself, allow it.
                 */
                if (zc->zc_objset_type == ZFS_PROP_USERUSED ||
                    zc->zc_objset_type == ZFS_PROP_USERQUOTA) {
                        if (zc->zc_guid == crgetuid(cr))
                                return (0);
                } else {
                        if (groupmember(zc->zc_guid, cr))
                                return (0);
                }
        }

        return (zfs_secpolicy_write_perms(zc->zc_name,
            userquota_perms[zc->zc_objset_type], cr));
}

static int
zfs_secpolicy_userspace_many(zfs_cmd_t *zc, cred_t *cr)
{
        int err = zfs_secpolicy_read(zc, cr);
        if (err)
                return (err);

        if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
                return (EINVAL);

        return (zfs_secpolicy_write_perms(zc->zc_name,
            userquota_perms[zc->zc_objset_type], cr));
}

static int
zfs_secpolicy_userspace_upgrade(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_setprop(zc->zc_name, ZFS_PROP_VERSION,
            NULL, cr));
}

static int
zfs_secpolicy_hold(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_HOLD, cr));
}

static int
zfs_secpolicy_release(zfs_cmd_t *zc, cred_t *cr)
{
        return (zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_RELEASE, cr));
}

/*
 * Policy for allowing temporary snapshots to be taken or released
 */
static int
zfs_secpolicy_tmp_snapshot(zfs_cmd_t *zc, cred_t *cr)
{
        /*
         * A temporary snapshot is the same as a snapshot,
         * hold, destroy and release all rolled into one.
         * Delegated diff alone is sufficient that we allow this.
         */
        int error;

        if ((error = zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_DIFF, cr)) == 0)
                return (0);

        error = zfs_secpolicy_snapshot(zc, cr);
        if (!error)
                error = zfs_secpolicy_hold(zc, cr);
        if (!error)
                error = zfs_secpolicy_release(zc, cr);
        if (!error)
                error = zfs_secpolicy_destroy(zc, cr);
        return (error);
}

/*
 * Returns the nvlist as specified by the user in the zfs_cmd_t.
 */
static int
get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp)
{
        char *packed;
        int error;
        nvlist_t *list = NULL;

        /*
         * Read in and unpack the user-supplied nvlist.
         */
        if (size == 0)
                return (EINVAL);

        packed = kmem_alloc(size, KM_SLEEP | KM_NODEBUG);

        if ((error = ddi_copyin((void *)(uintptr_t)nvl, packed, size,
            iflag)) != 0) {
                kmem_free(packed, size);
                return (error);
        }

        if ((error = nvlist_unpack(packed, size, &list, 0)) != 0) {
                kmem_free(packed, size);
                return (error);
        }

        kmem_free(packed, size);

        *nvp = list;
        return (0);
}

static int
fit_error_list(zfs_cmd_t *zc, nvlist_t **errors)
{
        size_t size;

        VERIFY(nvlist_size(*errors, &size, NV_ENCODE_NATIVE) == 0);

        if (size > zc->zc_nvlist_dst_size) {
                nvpair_t *more_errors;
                int n = 0;

                if (zc->zc_nvlist_dst_size < 1024)
                        return (ENOMEM);

                VERIFY(nvlist_add_int32(*errors, ZPROP_N_MORE_ERRORS, 0) == 0);
                more_errors = nvlist_prev_nvpair(*errors, NULL);

                do {
                        nvpair_t *pair = nvlist_prev_nvpair(*errors,
                            more_errors);
                        VERIFY(nvlist_remove_nvpair(*errors, pair) == 0);
                        n++;
                        VERIFY(nvlist_size(*errors, &size,
                            NV_ENCODE_NATIVE) == 0);
                } while (size > zc->zc_nvlist_dst_size);

                VERIFY(nvlist_remove_nvpair(*errors, more_errors) == 0);
                VERIFY(nvlist_add_int32(*errors, ZPROP_N_MORE_ERRORS, n) == 0);
                ASSERT(nvlist_size(*errors, &size, NV_ENCODE_NATIVE) == 0);
                ASSERT(size <= zc->zc_nvlist_dst_size);
        }

        return (0);
}

static int
put_nvlist(zfs_cmd_t *zc, nvlist_t *nvl)
{
        char *packed = NULL;
        int error = 0;
        size_t size;

        VERIFY(nvlist_size(nvl, &size, NV_ENCODE_NATIVE) == 0);

        if (size > zc->zc_nvlist_dst_size) {
                error = ENOMEM;
        } else {
                packed = kmem_alloc(size, KM_SLEEP | KM_NODEBUG);
                VERIFY(nvlist_pack(nvl, &packed, &size, NV_ENCODE_NATIVE,
                    KM_SLEEP) == 0);
                if (ddi_copyout(packed, (void *)(uintptr_t)zc->zc_nvlist_dst,
                    size, zc->zc_iflags) != 0)
                        error = EFAULT;
                kmem_free(packed, size);
        }

        zc->zc_nvlist_dst_size = size;
        return (error);
}

static int
get_zfs_sb(const char *dsname, zfs_sb_t **zsbp)
{
        objset_t *os;
        int error;

        error = dmu_objset_hold(dsname, FTAG, &os);
        if (error)
                return (error);
        if (dmu_objset_type(os) != DMU_OST_ZFS) {
                dmu_objset_rele(os, FTAG);
                return (EINVAL);
        }

        mutex_enter(&os->os_user_ptr_lock);
        *zsbp = dmu_objset_get_user(os);
        if (*zsbp && (*zsbp)->z_sb) {
                atomic_inc(&((*zsbp)->z_sb->s_active));
        } else {
                error = ESRCH;
        }
        mutex_exit(&os->os_user_ptr_lock);
        dmu_objset_rele(os, FTAG);
        return (error);
}

/*
 * Find a zfs_sb_t for a mounted filesystem, or create our own, in which
 * case its z_sb will be NULL, and it will be opened as the owner.
 */
static int
zfs_sb_hold(const char *name, void *tag, zfs_sb_t **zsbp, boolean_t writer)
{
        int error = 0;

        if (get_zfs_sb(name, zsbp) != 0)
                error = zfs_sb_create(name, zsbp);
        if (error == 0) {
                rrw_enter(&(*zsbp)->z_teardown_lock, (writer) ? RW_WRITER :
                    RW_READER, tag);
                if ((*zsbp)->z_unmounted) {
                        /*
                         * XXX we could probably try again, since the unmounting
                         * thread should be just about to disassociate the
                         * objset from the zfsvfs.
                         */
                        rrw_exit(&(*zsbp)->z_teardown_lock, tag);
                        return (EBUSY);
                }
        }
        return (error);
}

static void
zfs_sb_rele(zfs_sb_t *zsb, void *tag)
{
        rrw_exit(&zsb->z_teardown_lock, tag);

        if (zsb->z_sb) {
                deactivate_super(zsb->z_sb);
        } else {
                dmu_objset_disown(zsb->z_os, zsb);
                zfs_sb_free(zsb);
        }
}

static int
zfs_ioc_pool_create(zfs_cmd_t *zc)
{
        int error;
        nvlist_t *config, *props = NULL;
        nvlist_t *rootprops = NULL;
        nvlist_t *zplprops = NULL;
        char *buf;

        if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &config)))
                return (error);

        if (zc->zc_nvlist_src_size != 0 && (error =
            get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &props))) {
                nvlist_free(config);
                return (error);
        }

        if (props) {
                nvlist_t *nvl = NULL;
                uint64_t version = SPA_VERSION;

                (void) nvlist_lookup_uint64(props,
                    zpool_prop_to_name(ZPOOL_PROP_VERSION), &version);
                if (version < SPA_VERSION_INITIAL || version > SPA_VERSION) {
                        error = EINVAL;
                        goto pool_props_bad;
                }
                (void) nvlist_lookup_nvlist(props, ZPOOL_ROOTFS_PROPS, &nvl);
                if (nvl) {
                        error = nvlist_dup(nvl, &rootprops, KM_SLEEP);
                        if (error != 0) {
                                nvlist_free(config);
                                nvlist_free(props);
                                return (error);
                        }
                        (void) nvlist_remove_all(props, ZPOOL_ROOTFS_PROPS);
                }
                VERIFY(nvlist_alloc(&zplprops, NV_UNIQUE_NAME, KM_SLEEP) == 0);
                error = zfs_fill_zplprops_root(version, rootprops,
                    zplprops, NULL);
                if (error)
                        goto pool_props_bad;
        }

        buf = history_str_get(zc);

        error = spa_create(zc->zc_name, config, props, buf, zplprops);

        /*
         * Set the remaining root properties
         */
        if (!error && (error = zfs_set_prop_nvlist(zc->zc_name,
            ZPROP_SRC_LOCAL, rootprops, NULL)) != 0)
                (void) spa_destroy(zc->zc_name);

        if (buf != NULL)
                history_str_free(buf);

pool_props_bad:
        nvlist_free(rootprops);
        nvlist_free(zplprops);
        nvlist_free(config);
        nvlist_free(props);

        return (error);
}

static int
zfs_ioc_pool_destroy(zfs_cmd_t *zc)
{
        int error;
        zfs_log_history(zc);
        error = spa_destroy(zc->zc_name);
        if (error == 0)
                zvol_remove_minors(zc->zc_name);
        return (error);
}

static int
zfs_ioc_pool_import(zfs_cmd_t *zc)
{
        nvlist_t *config, *props = NULL;
        uint64_t guid;
        int error;

        if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &config)) != 0)
                return (error);

        if (zc->zc_nvlist_src_size != 0 && (error =
            get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &props))) {
                nvlist_free(config);
                return (error);
        }

        if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &guid) != 0 ||
            guid != zc->zc_guid)
                error = EINVAL;
        else
                error = spa_import(zc->zc_name, config, props, zc->zc_cookie);

        if (zc->zc_nvlist_dst != 0) {
                int err;

                if ((err = put_nvlist(zc, config)) != 0)
                        error = err;
        }

        if (error == 0)
                zvol_create_minors(zc->zc_name);

        nvlist_free(config);

        if (props)
                nvlist_free(props);

        return (error);
}

static int
zfs_ioc_pool_export(zfs_cmd_t *zc)
{
        int error;
        boolean_t force = (boolean_t)zc->zc_cookie;
        boolean_t hardforce = (boolean_t)zc->zc_guid;

        zfs_log_history(zc);
        error = spa_export(zc->zc_name, NULL, force, hardforce);
        if (error == 0)
                zvol_remove_minors(zc->zc_name);
        return (error);
}

static int
zfs_ioc_pool_configs(zfs_cmd_t *zc)
{
        nvlist_t *configs;
        int error;

        if ((configs = spa_all_configs(&zc->zc_cookie)) == NULL)
                return (EEXIST);

        error = put_nvlist(zc, configs);

        nvlist_free(configs);

        return (error);
}

static int
zfs_ioc_pool_stats(zfs_cmd_t *zc)
{
        nvlist_t *config;
        int error;
        int ret = 0;

        error = spa_get_stats(zc->zc_name, &config, zc->zc_value,
            sizeof (zc->zc_value));

        if (config != NULL) {
                ret = put_nvlist(zc, config);
                nvlist_free(config);

                /*
                 * The config may be present even if 'error' is non-zero.
                 * In this case we return success, and preserve the real errno
                 * in 'zc_cookie'.
                 */
                zc->zc_cookie = error;
        } else {
                ret = error;
        }

        return (ret);
}

/*
 * Try to import the given pool, returning pool stats as appropriate so that
 * user land knows which devices are available and overall pool health.
 */
static int
zfs_ioc_pool_tryimport(zfs_cmd_t *zc)
{
        nvlist_t *tryconfig, *config;
        int error;

        if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &tryconfig)) != 0)
                return (error);

        config = spa_tryimport(tryconfig);

        nvlist_free(tryconfig);

        if (config == NULL)
                return (EINVAL);

        error = put_nvlist(zc, config);
        nvlist_free(config);

        return (error);
}

/*
 * inputs:
 * zc_name              name of the pool
 * zc_cookie            scan func (pool_scan_func_t)
 */
static int
zfs_ioc_pool_scan(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        if (zc->zc_cookie == POOL_SCAN_NONE)
                error = spa_scan_stop(spa);
        else
                error = spa_scan(spa, zc->zc_cookie);

        spa_close(spa, FTAG);

        return (error);
}

static int
zfs_ioc_pool_freeze(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error == 0) {
                spa_freeze(spa);
                spa_close(spa, FTAG);
        }
        return (error);
}

static int
zfs_ioc_pool_upgrade(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        if (zc->zc_cookie < spa_version(spa) || zc->zc_cookie > SPA_VERSION) {
                spa_close(spa, FTAG);
                return (EINVAL);
        }

        spa_upgrade(spa, zc->zc_cookie);
        spa_close(spa, FTAG);

        return (error);
}

static int
zfs_ioc_pool_get_history(zfs_cmd_t *zc)
{
        spa_t *spa;
        char *hist_buf;
        uint64_t size;
        int error;

        if ((size = zc->zc_history_len) == 0)
                return (EINVAL);

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY) {
                spa_close(spa, FTAG);
                return (ENOTSUP);
        }

        hist_buf = vmem_alloc(size, KM_SLEEP);
        if ((error = spa_history_get(spa, &zc->zc_history_offset,
            &zc->zc_history_len, hist_buf)) == 0) {
                error = ddi_copyout(hist_buf,
                    (void *)(uintptr_t)zc->zc_history,
                    zc->zc_history_len, zc->zc_iflags);
        }

        spa_close(spa, FTAG);
        vmem_free(hist_buf, size);
        return (error);
}

static int
zfs_ioc_pool_reguid(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error == 0) {
                error = spa_change_guid(spa);
                spa_close(spa, FTAG);
        }
        return (error);
}

static int
zfs_ioc_dsobj_to_dsname(zfs_cmd_t *zc)
{
        int error;

        if ((error = dsl_dsobj_to_dsname(zc->zc_name,zc->zc_obj,zc->zc_value)))
                return (error);

        return (0);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_obj               object to find
 *
 * outputs:
 * zc_value             name of object
 */
static int
zfs_ioc_obj_to_path(zfs_cmd_t *zc)
{
        objset_t *os;
        int error;

        /* XXX reading from objset not owned */
        if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)) != 0)
                return (error);
        if (dmu_objset_type(os) != DMU_OST_ZFS) {
                dmu_objset_rele(os, FTAG);
                return (EINVAL);
        }
        error = zfs_obj_to_path(os, zc->zc_obj, zc->zc_value,
            sizeof (zc->zc_value));
        dmu_objset_rele(os, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_obj               object to find
 *
 * outputs:
 * zc_stat              stats on object
 * zc_value             path to object
 */
static int
zfs_ioc_obj_to_stats(zfs_cmd_t *zc)
{
        objset_t *os;
        int error;

        /* XXX reading from objset not owned */
        if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)) != 0)
                return (error);
        if (dmu_objset_type(os) != DMU_OST_ZFS) {
                dmu_objset_rele(os, FTAG);
                return (EINVAL);
        }
        error = zfs_obj_to_stats(os, zc->zc_obj, &zc->zc_stat, zc->zc_value,
            sizeof (zc->zc_value));
        dmu_objset_rele(os, FTAG);

        return (error);
}

static int
zfs_ioc_vdev_add(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;
        nvlist_t *config, **l2cache, **spares;
        uint_t nl2cache = 0, nspares = 0;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error != 0)
                return (error);

        error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &config);
        (void) nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_L2CACHE,
            &l2cache, &nl2cache);

        (void) nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_SPARES,
            &spares, &nspares);

        /*
         * A root pool with concatenated devices is not supported.
         * Thus, can not add a device to a root pool.
         *
         * Intent log device can not be added to a rootpool because
         * during mountroot, zil is replayed, a seperated log device
         * can not be accessed during the mountroot time.
         *
         * l2cache and spare devices are ok to be added to a rootpool.
         */
        if (spa_bootfs(spa) != 0 && nl2cache == 0 && nspares == 0) {
                nvlist_free(config);
                spa_close(spa, FTAG);
                return (EDOM);
        }

        if (error == 0) {
                error = spa_vdev_add(spa, config);
                nvlist_free(config);
        }
        spa_close(spa, FTAG);
        return (error);
}

/*
 * inputs:
 * zc_name              name of the pool
 * zc_nvlist_conf       nvlist of devices to remove
 * zc_cookie            to stop the remove?
 */
static int
zfs_ioc_vdev_remove(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error != 0)
                return (error);
        error = spa_vdev_remove(spa, zc->zc_guid, B_FALSE);
        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_vdev_set_state(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;
        vdev_state_t newstate = VDEV_STATE_UNKNOWN;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);
        switch (zc->zc_cookie) {
        case VDEV_STATE_ONLINE:
                error = vdev_online(spa, zc->zc_guid, zc->zc_obj, &newstate);
                break;

        case VDEV_STATE_OFFLINE:
                error = vdev_offline(spa, zc->zc_guid, zc->zc_obj);
                break;

        case VDEV_STATE_FAULTED:
                if (zc->zc_obj != VDEV_AUX_ERR_EXCEEDED &&
                    zc->zc_obj != VDEV_AUX_EXTERNAL)
                        zc->zc_obj = VDEV_AUX_ERR_EXCEEDED;

                error = vdev_fault(spa, zc->zc_guid, zc->zc_obj);
                break;

        case VDEV_STATE_DEGRADED:
                if (zc->zc_obj != VDEV_AUX_ERR_EXCEEDED &&
                    zc->zc_obj != VDEV_AUX_EXTERNAL)
                        zc->zc_obj = VDEV_AUX_ERR_EXCEEDED;

                error = vdev_degrade(spa, zc->zc_guid, zc->zc_obj);
                break;

        default:
                error = EINVAL;
        }
        zc->zc_cookie = newstate;
        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_vdev_attach(zfs_cmd_t *zc)
{
        spa_t *spa;
        int replacing = zc->zc_cookie;
        nvlist_t *config;
        int error;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &config)) == 0) {
                error = spa_vdev_attach(spa, zc->zc_guid, config, replacing);
                nvlist_free(config);
        }

        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_vdev_detach(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        error = spa_vdev_detach(spa, zc->zc_guid, 0, B_FALSE);

        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_vdev_split(zfs_cmd_t *zc)
{
        spa_t *spa;
        nvlist_t *config, *props = NULL;
        int error;
        boolean_t exp = !!(zc->zc_cookie & ZPOOL_EXPORT_AFTER_SPLIT);

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
            zc->zc_iflags, &config))) {
                spa_close(spa, FTAG);
                return (error);
        }

        if (zc->zc_nvlist_src_size != 0 && (error =
            get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &props))) {
                spa_close(spa, FTAG);
                nvlist_free(config);
                return (error);
        }

        error = spa_vdev_split_mirror(spa, zc->zc_string, config, props, exp);

        spa_close(spa, FTAG);

        nvlist_free(config);
        nvlist_free(props);

        return (error);
}

static int
zfs_ioc_vdev_setpath(zfs_cmd_t *zc)
{
        spa_t *spa;
        char *path = zc->zc_value;
        uint64_t guid = zc->zc_guid;
        int error;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error != 0)
                return (error);

        error = spa_vdev_setpath(spa, guid, path);
        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_vdev_setfru(zfs_cmd_t *zc)
{
        spa_t *spa;
        char *fru = zc->zc_value;
        uint64_t guid = zc->zc_guid;
        int error;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error != 0)
                return (error);

        error = spa_vdev_setfru(spa, guid, fru);
        spa_close(spa, FTAG);
        return (error);
}

static int
zfs_ioc_objset_stats_impl(zfs_cmd_t *zc, objset_t *os)
{
        int error = 0;
        nvlist_t *nv;

        dmu_objset_fast_stat(os, &zc->zc_objset_stats);

        if (zc->zc_nvlist_dst != 0 &&
            (error = dsl_prop_get_all(os, &nv)) == 0) {
                dmu_objset_stats(os, nv);
                /*
                 * NB: zvol_get_stats() will read the objset contents,
                 * which we aren't supposed to do with a
                 * DS_MODE_USER hold, because it could be
                 * inconsistent.  So this is a bit of a workaround...
                 * XXX reading with out owning
                 */
                if (!zc->zc_objset_stats.dds_inconsistent) {
                        if (dmu_objset_type(os) == DMU_OST_ZVOL)
                                error = zvol_get_stats(os, nv);
                }
                if (error == 0)
                        error = put_nvlist(zc, nv);
                nvlist_free(nv);
        }

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_nvlist_dst_size   size of buffer for property nvlist
 *
 * outputs:
 * zc_objset_stats      stats
 * zc_nvlist_dst        property nvlist
 * zc_nvlist_dst_size   size of property nvlist
 */
static int
zfs_ioc_objset_stats(zfs_cmd_t *zc)
{
        objset_t *os = NULL;
        int error;

        if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)))
                return (error);

        error = zfs_ioc_objset_stats_impl(zc, os);

        dmu_objset_rele(os, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_nvlist_dst_size   size of buffer for property nvlist
 *
 * outputs:
 * zc_nvlist_dst        received property nvlist
 * zc_nvlist_dst_size   size of received property nvlist
 *
 * Gets received properties (distinct from local properties on or after
 * SPA_VERSION_RECVD_PROPS) for callers who want to differentiate received from
 * local property values.
 */
static int
zfs_ioc_objset_recvd_props(zfs_cmd_t *zc)
{
        objset_t *os = NULL;
        int error;
        nvlist_t *nv;

        if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)))
                return (error);

        /*
         * Without this check, we would return local property values if the
         * caller has not already received properties on or after
         * SPA_VERSION_RECVD_PROPS.
         */
        if (!dsl_prop_get_hasrecvd(os)) {
                dmu_objset_rele(os, FTAG);
                return (ENOTSUP);
        }

        if (zc->zc_nvlist_dst != 0 &&
            (error = dsl_prop_get_received(os, &nv)) == 0) {
                error = put_nvlist(zc, nv);
                nvlist_free(nv);
        }

        dmu_objset_rele(os, FTAG);
        return (error);
}

static int
nvl_add_zplprop(objset_t *os, nvlist_t *props, zfs_prop_t prop)
{
        uint64_t value;
        int error;

        /*
         * zfs_get_zplprop() will either find a value or give us
         * the default value (if there is one).
         */
        if ((error = zfs_get_zplprop(os, prop, &value)) != 0)
                return (error);
        VERIFY(nvlist_add_uint64(props, zfs_prop_to_name(prop), value) == 0);
        return (0);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_nvlist_dst_size   size of buffer for zpl property nvlist
 *
 * outputs:
 * zc_nvlist_dst        zpl property nvlist
 * zc_nvlist_dst_size   size of zpl property nvlist
 */
static int
zfs_ioc_objset_zplprops(zfs_cmd_t *zc)
{
        objset_t *os;
        int err;

        /* XXX reading without owning */
        if ((err = dmu_objset_hold(zc->zc_name, FTAG, &os)))
                return (err);

        dmu_objset_fast_stat(os, &zc->zc_objset_stats);

        /*
         * NB: nvl_add_zplprop() will read the objset contents,
         * which we aren't supposed to do with a DS_MODE_USER
         * hold, because it could be inconsistent.
         */
        if (zc->zc_nvlist_dst != 0 &&
            !zc->zc_objset_stats.dds_inconsistent &&
            dmu_objset_type(os) == DMU_OST_ZFS) {
                nvlist_t *nv;

                VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
                if ((err = nvl_add_zplprop(os, nv, ZFS_PROP_VERSION)) == 0 &&
                    (err = nvl_add_zplprop(os, nv, ZFS_PROP_NORMALIZE)) == 0 &&
                    (err = nvl_add_zplprop(os, nv, ZFS_PROP_UTF8ONLY)) == 0 &&
                    (err = nvl_add_zplprop(os, nv, ZFS_PROP_CASE)) == 0)
                        err = put_nvlist(zc, nv);
                nvlist_free(nv);
        } else {
                err = ENOENT;
        }
        dmu_objset_rele(os, FTAG);
        return (err);
}

static boolean_t
dataset_name_hidden(const char *name)
{
        /*
         * Skip over datasets that are not visible in this zone,
         * internal datasets (which have a $ in their name), and
         * temporary datasets (which have a % in their name).
         */
        if (strchr(name, '$') != NULL)
                return (B_TRUE);
        if (strchr(name, '%') != NULL)
                return (B_TRUE);
        if (!INGLOBALZONE(curproc) && !zone_dataset_visible(name, NULL))
                return (B_TRUE);
        return (B_FALSE);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_cookie            zap cursor
 * zc_nvlist_dst_size   size of buffer for property nvlist
 *
 * outputs:
 * zc_name              name of next filesystem
 * zc_cookie            zap cursor
 * zc_objset_stats      stats
 * zc_nvlist_dst        property nvlist
 * zc_nvlist_dst_size   size of property nvlist
 */
static int
zfs_ioc_dataset_list_next(zfs_cmd_t *zc)
{
        objset_t *os;
        int error;
        char *p;
        size_t orig_len = strlen(zc->zc_name);

top:
        if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os))) {
                if (error == ENOENT)
                        error = ESRCH;
                return (error);
        }

        p = strrchr(zc->zc_name, '/');
        if (p == NULL || p[1] != '\0')
                (void) strlcat(zc->zc_name, "/", sizeof (zc->zc_name));
        p = zc->zc_name + strlen(zc->zc_name);

        /*
         * Pre-fetch the datasets.  dmu_objset_prefetch() always returns 0
         * but is not declared void because its called by dmu_objset_find().
         */
        if (zc->zc_cookie == 0) {
                uint64_t cookie = 0;
                int len = sizeof (zc->zc_name) - (p - zc->zc_name);

                while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
                        if (!dataset_name_hidden(zc->zc_name))
                                (void) dmu_objset_prefetch(zc->zc_name, NULL);
                }
        }

        do {
                error = dmu_dir_list_next(os,
                    sizeof (zc->zc_name) - (p - zc->zc_name), p,
                    NULL, &zc->zc_cookie);
                if (error == ENOENT)
                        error = ESRCH;
        } while (error == 0 && dataset_name_hidden(zc->zc_name) &&
            !(zc->zc_iflags & FKIOCTL));
        dmu_objset_rele(os, FTAG);

        /*
         * If it's an internal dataset (ie. with a '$' in its name),
         * don't try to get stats for it, otherwise we'll return ENOENT.
         */
        if (error == 0 && strchr(zc->zc_name, '$') == NULL) {
                error = zfs_ioc_objset_stats(zc); /* fill in the stats */
                if (error == ENOENT) {
                        /* We lost a race with destroy, get the next one. */
                        zc->zc_name[orig_len] = '\0';
                        goto top;
                }
        }
        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_cookie            zap cursor
 * zc_nvlist_dst_size   size of buffer for property nvlist
 *
 * outputs:
 * zc_name              name of next snapshot
 * zc_objset_stats      stats
 * zc_nvlist_dst        property nvlist
 * zc_nvlist_dst_size   size of property nvlist
 */
static int
zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
{
        objset_t *os;
        int error;

top:
        if (zc->zc_cookie == 0 && !zc->zc_simple)
                (void) dmu_objset_find(zc->zc_name, dmu_objset_prefetch,
                    NULL, DS_FIND_SNAPSHOTS);

        error = dmu_objset_hold(zc->zc_name, FTAG, &os);
        if (error)
                return (error == ENOENT ? ESRCH : error);

        /*
         * A dataset name of maximum length cannot have any snapshots,
         * so exit immediately.
         */
        if (strlcat(zc->zc_name, "@", sizeof (zc->zc_name)) >= MAXNAMELEN) {
                dmu_objset_rele(os, FTAG);
                return (ESRCH);
        }

        error = dmu_snapshot_list_next(os,
            sizeof (zc->zc_name) - strlen(zc->zc_name),
            zc->zc_name + strlen(zc->zc_name), &zc->zc_obj, &zc->zc_cookie,
            NULL);

        if (error == 0 && !zc->zc_simple) {
                dsl_dataset_t *ds;
                dsl_pool_t *dp = os->os_dsl_dataset->ds_dir->dd_pool;

                /*
                 * Since we probably don't have a hold on this snapshot,
                 * it's possible that the objsetid could have been destroyed
                 * and reused for a new objset. It's OK if this happens during
                 * a zfs send operation, since the new createtxg will be
                 * beyond the range we're interested in.
                 */
                rw_enter(&dp->dp_config_rwlock, RW_READER);
                error = dsl_dataset_hold_obj(dp, zc->zc_obj, FTAG, &ds);
                rw_exit(&dp->dp_config_rwlock);
                if (error) {
                        if (error == ENOENT) {
                                /* Racing with destroy, get the next one. */
                                *strchr(zc->zc_name, '@') = '\0';
                                dmu_objset_rele(os, FTAG);
                                goto top;
                        }
                } else {
                        objset_t *ossnap;

                        error = dmu_objset_from_ds(ds, &ossnap);
                        if (error == 0)
                                error = zfs_ioc_objset_stats_impl(zc, ossnap);
                        dsl_dataset_rele(ds, FTAG);
                }
        } else if (error == ENOENT) {
                error = ESRCH;
        }

        dmu_objset_rele(os, FTAG);
        /* if we failed, undo the @ that we tacked on to zc_name */
        if (error)
                *strchr(zc->zc_name, '@') = '\0';
        return (error);
}

static int
zfs_prop_set_userquota(const char *dsname, nvpair_t *pair)
{
        const char *propname = nvpair_name(pair);
        uint64_t *valary;
        unsigned int vallen;
        const char *domain;
        char *dash;
        zfs_userquota_prop_t type;
        uint64_t rid;
        uint64_t quota;
        zfs_sb_t *zsb;
        int err;

        if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
                nvlist_t *attrs;
                VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
                if (nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                    &pair) != 0)
                        return (EINVAL);
        }

        /*
         * A correctly constructed propname is encoded as
         * userquota@<rid>-<domain>.
         */
        if ((dash = strchr(propname, '-')) == NULL ||
            nvpair_value_uint64_array(pair, &valary, &vallen) != 0 ||
            vallen != 3)
                return (EINVAL);

        domain = dash + 1;
        type = valary[0];
        rid = valary[1];
        quota = valary[2];

        err = zfs_sb_hold(dsname, FTAG, &zsb, B_FALSE);
        if (err == 0) {
                err = zfs_set_userquota(zsb, type, domain, rid, quota);
                zfs_sb_rele(zsb, FTAG);
        }

        return (err);
}

/*
 * If the named property is one that has a special function to set its value,
 * return 0 on success and a positive error code on failure; otherwise if it is
 * not one of the special properties handled by this function, return -1.
 *
 * XXX: It would be better for callers of the property interface if we handled
 * these special cases in dsl_prop.c (in the dsl layer).
 */
static int
zfs_prop_set_special(const char *dsname, zprop_source_t source,
    nvpair_t *pair)
{
        const char *propname = nvpair_name(pair);
        zfs_prop_t prop = zfs_name_to_prop(propname);
        uint64_t intval;
        int err;

        if (prop == ZPROP_INVAL) {
                if (zfs_prop_userquota(propname))
                        return (zfs_prop_set_userquota(dsname, pair));
                return (-1);
        }

        if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
                nvlist_t *attrs;
                VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
                VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                    &pair) == 0);
        }

        if (zfs_prop_get_type(prop) == PROP_TYPE_STRING)
                return (-1);

        VERIFY(0 == nvpair_value_uint64(pair, &intval));

        switch (prop) {
        case ZFS_PROP_QUOTA:
                err = dsl_dir_set_quota(dsname, source, intval);
                break;
        case ZFS_PROP_REFQUOTA:
                err = dsl_dataset_set_quota(dsname, source, intval);
                break;
        case ZFS_PROP_RESERVATION:
                err = dsl_dir_set_reservation(dsname, source, intval);
                break;
        case ZFS_PROP_REFRESERVATION:
                err = dsl_dataset_set_reservation(dsname, source, intval);
                break;
        case ZFS_PROP_VOLSIZE:
                err = zvol_set_volsize(dsname, intval);
                break;
        case ZFS_PROP_VERSION:
        {
                zfs_sb_t *zsb;

                if ((err = zfs_sb_hold(dsname, FTAG, &zsb, B_TRUE)) != 0)
                        break;

                err = zfs_set_version(zsb, intval);
                zfs_sb_rele(zsb, FTAG);

                if (err == 0 && intval >= ZPL_VERSION_USERSPACE) {
                        zfs_cmd_t *zc;

                        zc = kmem_zalloc(sizeof (zfs_cmd_t),
                            KM_SLEEP | KM_NODEBUG);
                        (void) strcpy(zc->zc_name, dsname);
                        (void) zfs_ioc_userspace_upgrade(zc);
                        kmem_free(zc, sizeof (zfs_cmd_t));
                }
                break;
        }

        default:
                err = -1;
        }

        return (err);
}

/*
 * This function is best effort. If it fails to set any of the given properties,
 * it continues to set as many as it can and returns the first error
 * encountered. If the caller provides a non-NULL errlist, it also gives the
 * complete list of names of all the properties it failed to set along with the
 * corresponding error numbers. The caller is responsible for freeing the
 * returned errlist.
 *
 * If every property is set successfully, zero is returned and the list pointed
 * at by errlist is NULL.
 */
int
zfs_set_prop_nvlist(const char *dsname, zprop_source_t source, nvlist_t *nvl,
    nvlist_t **errlist)
{
        nvpair_t *pair;
        nvpair_t *propval;
        int rv = 0;
        uint64_t intval;
        char *strval;
        nvlist_t *genericnvl;
        nvlist_t *errors;
        nvlist_t *retrynvl;

        VERIFY(nvlist_alloc(&genericnvl, NV_UNIQUE_NAME, KM_SLEEP) == 0);
        VERIFY(nvlist_alloc(&errors, NV_UNIQUE_NAME, KM_SLEEP) == 0);
        VERIFY(nvlist_alloc(&retrynvl, NV_UNIQUE_NAME, KM_SLEEP) == 0);

retry:
        pair = NULL;
        while ((pair = nvlist_next_nvpair(nvl, pair)) != NULL) {
                const char *propname = nvpair_name(pair);
                zfs_prop_t prop = zfs_name_to_prop(propname);
                int err = 0;

                /* decode the property value */
                propval = pair;
                if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
                        nvlist_t *attrs;
                        VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
                        if (nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                            &propval) != 0)
                                err = EINVAL;
                }

                /* Validate value type */
                if (err == 0 && prop == ZPROP_INVAL) {
                        if (zfs_prop_user(propname)) {
                                if (nvpair_type(propval) != DATA_TYPE_STRING)
                                        err = EINVAL;
                        } else if (zfs_prop_userquota(propname)) {
                                if (nvpair_type(propval) !=
                                    DATA_TYPE_UINT64_ARRAY)
                                        err = EINVAL;
                        }
                } else if (err == 0) {
                        if (nvpair_type(propval) == DATA_TYPE_STRING) {
                                if (zfs_prop_get_type(prop) != PROP_TYPE_STRING)
                                        err = EINVAL;
                        } else if (nvpair_type(propval) == DATA_TYPE_UINT64) {
                                const char *unused;

                                VERIFY(nvpair_value_uint64(propval,
                                    &intval) == 0);

                                switch (zfs_prop_get_type(prop)) {
                                case PROP_TYPE_NUMBER:
                                        break;
                                case PROP_TYPE_STRING:
                                        err = EINVAL;
                                        break;
                                case PROP_TYPE_INDEX:
                                        if (zfs_prop_index_to_string(prop,
                                            intval, &unused) != 0)
                                                err = EINVAL;
                                        break;
                                default:
                                        cmn_err(CE_PANIC,
                                            "unknown property type");
                                }
                        } else {
                                err = EINVAL;
                        }
                }

                /* Validate permissions */
                if (err == 0)
                        err = zfs_check_settable(dsname, pair, CRED());

                if (err == 0) {
                        err = zfs_prop_set_special(dsname, source, pair);
                        if (err == -1) {
                                /*
                                 * For better performance we build up a list of
                                 * properties to set in a single transaction.
                                 */
                                err = nvlist_add_nvpair(genericnvl, pair);
                        } else if (err != 0 && nvl != retrynvl) {
                                /*
                                 * This may be a spurious error caused by
                                 * receiving quota and reservation out of order.
                                 * Try again in a second pass.
                                 */
                                err = nvlist_add_nvpair(retrynvl, pair);
                        }
                }

                if (err != 0)
                        VERIFY(nvlist_add_int32(errors, propname, err) == 0);
        }

        if (nvl != retrynvl && !nvlist_empty(retrynvl)) {
                nvl = retrynvl;
                goto retry;
        }

        if (!nvlist_empty(genericnvl) &&
            dsl_props_set(dsname, source, genericnvl) != 0) {
                /*
                 * If this fails, we still want to set as many properties as we
                 * can, so try setting them individually.
                 */
                pair = NULL;
                while ((pair = nvlist_next_nvpair(genericnvl, pair)) != NULL) {
                        const char *propname = nvpair_name(pair);
                        int err = 0;

                        propval = pair;
                        if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
                                nvlist_t *attrs;
                                VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
                                VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                                    &propval) == 0);
                        }

                        if (nvpair_type(propval) == DATA_TYPE_STRING) {
                                VERIFY(nvpair_value_string(propval,
                                    &strval) == 0);
                                err = dsl_prop_set(dsname, propname, source, 1,
                                    strlen(strval) + 1, strval);
                        } else {
                                VERIFY(nvpair_value_uint64(propval,
                                    &intval) == 0);
                                err = dsl_prop_set(dsname, propname, source, 8,
                                    1, &intval);
                        }

                        if (err != 0) {
                                VERIFY(nvlist_add_int32(errors, propname,
                                    err) == 0);
                        }
                }
        }
        nvlist_free(genericnvl);
        nvlist_free(retrynvl);

        if ((pair = nvlist_next_nvpair(errors, NULL)) == NULL) {
                nvlist_free(errors);
                errors = NULL;
        } else {
                VERIFY(nvpair_value_int32(pair, &rv) == 0);
        }

        if (errlist == NULL)
                nvlist_free(errors);
        else
                *errlist = errors;

        return (rv);
}

/*
 * Check that all the properties are valid user properties.
 */
static int
zfs_check_userprops(char *fsname, nvlist_t *nvl)
{
        nvpair_t *pair = NULL;
        int error = 0;

        while ((pair = nvlist_next_nvpair(nvl, pair)) != NULL) {
                const char *propname = nvpair_name(pair);
                char *valstr;

                if (!zfs_prop_user(propname) ||
                    nvpair_type(pair) != DATA_TYPE_STRING)
                        return (EINVAL);

                if ((error = zfs_secpolicy_write_perms(fsname,
                    ZFS_DELEG_PERM_USERPROP, CRED())))
                        return (error);

                if (strlen(propname) >= ZAP_MAXNAMELEN)
                        return (ENAMETOOLONG);

                VERIFY(nvpair_value_string(pair, &valstr) == 0);
                if (strlen(valstr) >= ZAP_MAXVALUELEN)
                        return (E2BIG);
        }
        return (0);
}

static void
props_skip(nvlist_t *props, nvlist_t *skipped, nvlist_t **newprops)
{
        nvpair_t *pair;

        VERIFY(nvlist_alloc(newprops, NV_UNIQUE_NAME, KM_SLEEP) == 0);

        pair = NULL;
        while ((pair = nvlist_next_nvpair(props, pair)) != NULL) {
                if (nvlist_exists(skipped, nvpair_name(pair)))
                        continue;

                VERIFY(nvlist_add_nvpair(*newprops, pair) == 0);
        }
}

static int
clear_received_props(objset_t *os, const char *fs, nvlist_t *props,
    nvlist_t *skipped)
{
        int err = 0;
        nvlist_t *cleared_props = NULL;
        props_skip(props, skipped, &cleared_props);
        if (!nvlist_empty(cleared_props)) {
                /*
                 * Acts on local properties until the dataset has received
                 * properties at least once on or after SPA_VERSION_RECVD_PROPS.
                 */
                zprop_source_t flags = (ZPROP_SRC_NONE |
                    (dsl_prop_get_hasrecvd(os) ? ZPROP_SRC_RECEIVED : 0));
                err = zfs_set_prop_nvlist(fs, flags, cleared_props, NULL);
        }
        nvlist_free(cleared_props);
        return (err);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_value             name of property to set
 * zc_nvlist_src{_size} nvlist of properties to apply
 * zc_cookie            received properties flag
 *
 * outputs:
 * zc_nvlist_dst{_size} error for each unapplied received property
 */
static int
zfs_ioc_set_prop(zfs_cmd_t *zc)
{
        nvlist_t *nvl;
        boolean_t received = zc->zc_cookie;
        zprop_source_t source = (received ? ZPROP_SRC_RECEIVED :
            ZPROP_SRC_LOCAL);
        nvlist_t *errors = NULL;
        int error;

        if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &nvl)) != 0)
                return (error);

        if (received) {
                nvlist_t *origprops;
                objset_t *os;

                if (dmu_objset_hold(zc->zc_name, FTAG, &os) == 0) {
                        if (dsl_prop_get_received(os, &origprops) == 0) {
                                (void) clear_received_props(os,
                                    zc->zc_name, origprops, nvl);
                                nvlist_free(origprops);
                        }

                        dsl_prop_set_hasrecvd(os);
                        dmu_objset_rele(os, FTAG);
                }
        }

        error = zfs_set_prop_nvlist(zc->zc_name, source, nvl, &errors);

        if (zc->zc_nvlist_dst != 0 && errors != NULL) {
                (void) put_nvlist(zc, errors);
        }

        nvlist_free(errors);
        nvlist_free(nvl);
        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_value             name of property to inherit
 * zc_cookie            revert to received value if TRUE
 *
 * outputs:             none
 */
static int
zfs_ioc_inherit_prop(zfs_cmd_t *zc)
{
        const char *propname = zc->zc_value;
        zfs_prop_t prop = zfs_name_to_prop(propname);
        boolean_t received = zc->zc_cookie;
        zprop_source_t source = (received
            ? ZPROP_SRC_NONE            /* revert to received value, if any */
            : ZPROP_SRC_INHERITED);     /* explicitly inherit */

        if (received) {
                nvlist_t *dummy;
                nvpair_t *pair;
                zprop_type_t type;
                int err;

                /*
                 * zfs_prop_set_special() expects properties in the form of an
                 * nvpair with type info.
                 */
                if (prop == ZPROP_INVAL) {
                        if (!zfs_prop_user(propname))
                                return (EINVAL);

                        type = PROP_TYPE_STRING;
                } else if (prop == ZFS_PROP_VOLSIZE ||
                    prop == ZFS_PROP_VERSION) {
                        return (EINVAL);
                } else {
                        type = zfs_prop_get_type(prop);
                }

                VERIFY(nvlist_alloc(&dummy, NV_UNIQUE_NAME, KM_SLEEP) == 0);

                switch (type) {
                case PROP_TYPE_STRING:
                        VERIFY(0 == nvlist_add_string(dummy, propname, ""));
                        break;
                case PROP_TYPE_NUMBER:
                case PROP_TYPE_INDEX:
                        VERIFY(0 == nvlist_add_uint64(dummy, propname, 0));
                        break;
                default:
                        nvlist_free(dummy);
                        return (EINVAL);
                }

                pair = nvlist_next_nvpair(dummy, NULL);
                err = zfs_prop_set_special(zc->zc_name, source, pair);
                nvlist_free(dummy);
                if (err != -1)
                        return (err); /* special property already handled */
        } else {
                /*
                 * Only check this in the non-received case. We want to allow
                 * 'inherit -S' to revert non-inheritable properties like quota
                 * and reservation to the received or default values even though
                 * they are not considered inheritable.
                 */
                if (prop != ZPROP_INVAL && !zfs_prop_inheritable(prop))
                        return (EINVAL);
        }

        /* the property name has been validated by zfs_secpolicy_inherit() */
        return (dsl_prop_set(zc->zc_name, zc->zc_value, source, 0, 0, NULL));
}

static int
zfs_ioc_pool_set_props(zfs_cmd_t *zc)
{
        nvlist_t *props;
        spa_t *spa;
        int error;
        nvpair_t *pair;

        if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &props)))
                return (error);

        /*
         * If the only property is the configfile, then just do a spa_lookup()
         * to handle the faulted case.
         */
        pair = nvlist_next_nvpair(props, NULL);
        if (pair != NULL && strcmp(nvpair_name(pair),
            zpool_prop_to_name(ZPOOL_PROP_CACHEFILE)) == 0 &&
            nvlist_next_nvpair(props, pair) == NULL) {
                mutex_enter(&spa_namespace_lock);
                if ((spa = spa_lookup(zc->zc_name)) != NULL) {
                        spa_configfile_set(spa, props, B_FALSE);
                        spa_config_sync(spa, B_FALSE, B_TRUE);
                }
                mutex_exit(&spa_namespace_lock);
                if (spa != NULL) {
                        nvlist_free(props);
                        return (0);
                }
        }

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0) {
                nvlist_free(props);
                return (error);
        }

        error = spa_prop_set(spa, props);

        nvlist_free(props);
        spa_close(spa, FTAG);

        return (error);
}

static int
zfs_ioc_pool_get_props(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;
        nvlist_t *nvp = NULL;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0) {
                /*
                 * If the pool is faulted, there may be properties we can still
                 * get (such as altroot and cachefile), so attempt to get them
                 * anyway.
                 */
                mutex_enter(&spa_namespace_lock);
                if ((spa = spa_lookup(zc->zc_name)) != NULL)
                        error = spa_prop_get(spa, &nvp);
                mutex_exit(&spa_namespace_lock);
        } else {
                error = spa_prop_get(spa, &nvp);
                spa_close(spa, FTAG);
        }

        if (error == 0 && zc->zc_nvlist_dst != 0)
                error = put_nvlist(zc, nvp);
        else
                error = EFAULT;

        nvlist_free(nvp);
        return (error);
}

/*
 * inputs:
 * zc_name              name of volume
 *
 * outputs:             none
 */
static int
zfs_ioc_create_minor(zfs_cmd_t *zc)
{
        return (zvol_create_minor(zc->zc_name));
}

/*
 * inputs:
 * zc_name              name of volume
 *
 * outputs:             none
 */
static int
zfs_ioc_remove_minor(zfs_cmd_t *zc)
{
        return (zvol_remove_minor(zc->zc_name));
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_nvlist_src{_size} nvlist of delegated permissions
 * zc_perm_action       allow/unallow flag
 *
 * outputs:             none
 */
static int
zfs_ioc_set_fsacl(zfs_cmd_t *zc)
{
        int error;
        nvlist_t *fsaclnv = NULL;

        if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &fsaclnv)) != 0)
                return (error);

        /*
         * Verify nvlist is constructed correctly
         */
        if ((error = zfs_deleg_verify_nvlist(fsaclnv)) != 0) {
                nvlist_free(fsaclnv);
                return (EINVAL);
        }

        /*
         * If we don't have PRIV_SYS_MOUNT, then validate
         * that user is allowed to hand out each permission in
         * the nvlist(s)
         */

        error = secpolicy_zfs(CRED());
        if (error) {
                if (zc->zc_perm_action == B_FALSE) {
                        error = dsl_deleg_can_allow(zc->zc_name,
                            fsaclnv, CRED());
                } else {
                        error = dsl_deleg_can_unallow(zc->zc_name,
                            fsaclnv, CRED());
                }
        }

        if (error == 0)
                error = dsl_deleg_set(zc->zc_name, fsaclnv, zc->zc_perm_action);

        nvlist_free(fsaclnv);
        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 *
 * outputs:
 * zc_nvlist_src{_size} nvlist of delegated permissions
 */
static int
zfs_ioc_get_fsacl(zfs_cmd_t *zc)
{
        nvlist_t *nvp;
        int error;

        if ((error = dsl_deleg_get(zc->zc_name, &nvp)) == 0) {
                error = put_nvlist(zc, nvp);
                nvlist_free(nvp);
        }

        return (error);
}

/* ARGSUSED */
static void
zfs_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
{
        zfs_creat_t *zct = arg;

        zfs_create_fs(os, cr, zct->zct_zplprops, tx);
}

#define ZFS_PROP_UNDEFINED      ((uint64_t)-1)

/*
 * inputs:
 * createprops          list of properties requested by creator
 * default_zplver       zpl version to use if unspecified in createprops
 * fuids_ok             fuids allowed in this version of the spa?
 * os                   parent objset pointer (NULL if root fs)
 *
 * outputs:
 * zplprops     values for the zplprops we attach to the master node object
 * is_ci        true if requested file system will be purely case-insensitive
 *
 * Determine the settings for utf8only, normalization and
 * casesensitivity.  Specific values may have been requested by the
 * creator and/or we can inherit values from the parent dataset.  If
 * the file system is of too early a vintage, a creator can not
 * request settings for these properties, even if the requested
 * setting is the default value.  We don't actually want to create dsl
 * properties for these, so remove them from the source nvlist after
 * processing.
 */
static int
zfs_fill_zplprops_impl(objset_t *os, uint64_t zplver,
    boolean_t fuids_ok, boolean_t sa_ok, nvlist_t *createprops,
    nvlist_t *zplprops, boolean_t *is_ci)
{
        uint64_t sense = ZFS_PROP_UNDEFINED;
        uint64_t norm = ZFS_PROP_UNDEFINED;
        uint64_t u8 = ZFS_PROP_UNDEFINED;
        int error;

        ASSERT(zplprops != NULL);

        /*
         * Pull out creator prop choices, if any.
         */
        if (createprops) {
                (void) nvlist_lookup_uint64(createprops,
                    zfs_prop_to_name(ZFS_PROP_VERSION), &zplver);
                (void) nvlist_lookup_uint64(createprops,
                    zfs_prop_to_name(ZFS_PROP_NORMALIZE), &norm);
                (void) nvlist_remove_all(createprops,
                    zfs_prop_to_name(ZFS_PROP_NORMALIZE));
                (void) nvlist_lookup_uint64(createprops,
                    zfs_prop_to_name(ZFS_PROP_UTF8ONLY), &u8);
                (void) nvlist_remove_all(createprops,
                    zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
                (void) nvlist_lookup_uint64(createprops,
                    zfs_prop_to_name(ZFS_PROP_CASE), &sense);
                (void) nvlist_remove_all(createprops,
                    zfs_prop_to_name(ZFS_PROP_CASE));
        }

        /*
         * If the zpl version requested is whacky or the file system
         * or pool is version is too "young" to support normalization
         * and the creator tried to set a value for one of the props,
         * error out.
         */
        if ((zplver < ZPL_VERSION_INITIAL || zplver > ZPL_VERSION) ||
            (zplver >= ZPL_VERSION_FUID && !fuids_ok) ||
            (zplver >= ZPL_VERSION_SA && !sa_ok) ||
            (zplver < ZPL_VERSION_NORMALIZATION &&
            (norm != ZFS_PROP_UNDEFINED || u8 != ZFS_PROP_UNDEFINED ||
            sense != ZFS_PROP_UNDEFINED)))
                return (ENOTSUP);

        /*
         * Put the version in the zplprops
         */
        VERIFY(nvlist_add_uint64(zplprops,
            zfs_prop_to_name(ZFS_PROP_VERSION), zplver) == 0);

        if (norm == ZFS_PROP_UNDEFINED &&
            (error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &norm)) != 0)
                return (error);
        VERIFY(nvlist_add_uint64(zplprops,
            zfs_prop_to_name(ZFS_PROP_NORMALIZE), norm) == 0);

        /*
         * If we're normalizing, names must always be valid UTF-8 strings.
         */
        if (norm)
                u8 = 1;
        if (u8 == ZFS_PROP_UNDEFINED &&
            (error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &u8)) != 0)
                return (error);
        VERIFY(nvlist_add_uint64(zplprops,
            zfs_prop_to_name(ZFS_PROP_UTF8ONLY), u8) == 0);

        if (sense == ZFS_PROP_UNDEFINED &&
            (error = zfs_get_zplprop(os, ZFS_PROP_CASE, &sense)) != 0)
                return (error);
        VERIFY(nvlist_add_uint64(zplprops,
            zfs_prop_to_name(ZFS_PROP_CASE), sense) == 0);

        if (is_ci)
                *is_ci = (sense == ZFS_CASE_INSENSITIVE);

        return (0);
}

static int
zfs_fill_zplprops(const char *dataset, nvlist_t *createprops,
    nvlist_t *zplprops, boolean_t *is_ci)
{
        boolean_t fuids_ok, sa_ok;
        uint64_t zplver = ZPL_VERSION;
        objset_t *os = NULL;
        char parentname[MAXNAMELEN];
        char *cp;
        spa_t *spa;
        uint64_t spa_vers;
        int error;

        (void) strlcpy(parentname, dataset, sizeof (parentname));
        cp = strrchr(parentname, '/');
        ASSERT(cp != NULL);
        cp[0] = '\0';

        if ((error = spa_open(dataset, &spa, FTAG)) != 0)
                return (error);

        spa_vers = spa_version(spa);
        spa_close(spa, FTAG);

        zplver = zfs_zpl_version_map(spa_vers);
        fuids_ok = (zplver >= ZPL_VERSION_FUID);
        sa_ok = (zplver >= ZPL_VERSION_SA);

        /*
         * Open parent object set so we can inherit zplprop values.
         */
        if ((error = dmu_objset_hold(parentname, FTAG, &os)) != 0)
                return (error);

        error = zfs_fill_zplprops_impl(os, zplver, fuids_ok, sa_ok, createprops,
            zplprops, is_ci);
        dmu_objset_rele(os, FTAG);
        return (error);
}

static int
zfs_fill_zplprops_root(uint64_t spa_vers, nvlist_t *createprops,
    nvlist_t *zplprops, boolean_t *is_ci)
{
        boolean_t fuids_ok;
        boolean_t sa_ok;
        uint64_t zplver = ZPL_VERSION;
        int error;

        zplver = zfs_zpl_version_map(spa_vers);
        fuids_ok = (zplver >= ZPL_VERSION_FUID);
        sa_ok = (zplver >= ZPL_VERSION_SA);

        error = zfs_fill_zplprops_impl(NULL, zplver, fuids_ok, sa_ok,
            createprops, zplprops, is_ci);
        return (error);
}

/*
 * inputs:
 * zc_objset_type       type of objset to create (fs vs zvol)
 * zc_name              name of new objset
 * zc_value             name of snapshot to clone from (may be empty)
 * zc_nvlist_src{_size} nvlist of properties to apply
 *
 * outputs: none
 */
static int
zfs_ioc_create(zfs_cmd_t *zc)
{
        objset_t *clone;
        int error = 0;
        zfs_creat_t zct;
        nvlist_t *nvprops = NULL;
        void (*cbfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
        dmu_objset_type_t type = zc->zc_objset_type;

        switch (type) {

        case DMU_OST_ZFS:
                cbfunc = zfs_create_cb;
                break;

        case DMU_OST_ZVOL:
                cbfunc = zvol_create_cb;
                break;

        default:
                cbfunc = NULL;
                break;
        }
        if (strchr(zc->zc_name, '@') ||
            strchr(zc->zc_name, '%'))
                return (EINVAL);

        if (zc->zc_nvlist_src != 0 &&
            (error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &nvprops)) != 0)
                return (error);

        zct.zct_zplprops = NULL;
        zct.zct_props = nvprops;

        if (zc->zc_value[0] != '\0') {
                /*
                 * We're creating a clone of an existing snapshot.
                 */
                zc->zc_value[sizeof (zc->zc_value) - 1] = '\0';
                if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0) {
                        nvlist_free(nvprops);
                        return (EINVAL);
                }

                error = dmu_objset_hold(zc->zc_value, FTAG, &clone);
                if (error) {
                        nvlist_free(nvprops);
                        return (error);
                }

                error = dmu_objset_clone(zc->zc_name, dmu_objset_ds(clone), 0);
                dmu_objset_rele(clone, FTAG);
                if (error) {
                        nvlist_free(nvprops);
                        return (error);
                }
        } else {
                boolean_t is_insensitive = B_FALSE;

                if (cbfunc == NULL) {
                        nvlist_free(nvprops);
                        return (EINVAL);
                }

                if (type == DMU_OST_ZVOL) {
                        uint64_t volsize, volblocksize;

                        if (nvprops == NULL ||
                            nvlist_lookup_uint64(nvprops,
                            zfs_prop_to_name(ZFS_PROP_VOLSIZE),
                            &volsize) != 0) {
                                nvlist_free(nvprops);
                                return (EINVAL);
                        }

                        if ((error = nvlist_lookup_uint64(nvprops,
                            zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
                            &volblocksize)) != 0 && error != ENOENT) {
                                nvlist_free(nvprops);
                                return (EINVAL);
                        }

                        if (error != 0)
                                volblocksize = zfs_prop_default_numeric(
                                    ZFS_PROP_VOLBLOCKSIZE);

                        if ((error = zvol_check_volblocksize(
                            volblocksize)) != 0 ||
                            (error = zvol_check_volsize(volsize,
                            volblocksize)) != 0) {
                                nvlist_free(nvprops);
                                return (error);
                        }
                } else if (type == DMU_OST_ZFS) {
                        int error;

                        /*
                         * We have to have normalization and
                         * case-folding flags correct when we do the
                         * file system creation, so go figure them out
                         * now.
                         */
                        VERIFY(nvlist_alloc(&zct.zct_zplprops,
                            NV_UNIQUE_NAME, KM_SLEEP) == 0);
                        error = zfs_fill_zplprops(zc->zc_name, nvprops,
                            zct.zct_zplprops, &is_insensitive);
                        if (error != 0) {
                                nvlist_free(nvprops);
                                nvlist_free(zct.zct_zplprops);
                                return (error);
                        }
                }
                error = dmu_objset_create(zc->zc_name, type,
                    is_insensitive ? DS_FLAG_CI_DATASET : 0, cbfunc, &zct);
                nvlist_free(zct.zct_zplprops);
        }

        /*
         * It would be nice to do this atomically.
         */
        if (error == 0) {
                error = zfs_set_prop_nvlist(zc->zc_name, ZPROP_SRC_LOCAL,
                    nvprops, NULL);
                if (error != 0)
                        (void) dmu_objset_destroy(zc->zc_name, B_FALSE);
        }
        nvlist_free(nvprops);
        return (error);
}

/*
 * inputs:
 * zc_name      name of filesystem
 * zc_value     short name of snapshot
 * zc_cookie    recursive flag
 * zc_nvlist_src[_size] property list
 *
 * outputs:
 * zc_value     short snapname (i.e. part after the '@')
 */
static int
zfs_ioc_snapshot(zfs_cmd_t *zc)
{
        nvlist_t *nvprops = NULL;
        int error;
        boolean_t recursive = zc->zc_cookie;

        if (snapshot_namecheck(zc->zc_value, NULL, NULL) != 0)
                return (EINVAL);

        if (zc->zc_nvlist_src != 0 &&
            (error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &nvprops)) != 0)
                return (error);

        error = zfs_check_userprops(zc->zc_name, nvprops);
        if (error)
                goto out;

        if (!nvlist_empty(nvprops) &&
            zfs_earlier_version(zc->zc_name, SPA_VERSION_SNAP_PROPS)) {
                error = ENOTSUP;
                goto out;
        }

        error = dmu_objset_snapshot(zc->zc_name, zc->zc_value, NULL,
            nvprops, recursive, B_FALSE, -1);

out:
        nvlist_free(nvprops);
        return (error);
}

/*
 * inputs:
 * name         dataset name, or when 'arg == NULL' the full snapshot name
 * arg          short snapshot name (i.e. part after the '@')
 */
int
zfs_unmount_snap(const char *name, void *arg)
{
        zfs_sb_t *zsb = NULL;
        char *dsname;
        char *snapname;
        char *fullname;
        char *ptr;
        int error;

        if (arg) {
                dsname = strdup(name);
                snapname = strdup(arg);
        } else {
                ptr = strchr(name, '@');
                if (ptr) {
                        dsname = strdup(name);
                        dsname[ptr - name] = '\0';
                        snapname = strdup(ptr + 1);
                } else {
                        return (0);
                }
        }

        fullname = kmem_asprintf("%s@%s", dsname, snapname);

        error = zfs_sb_hold(dsname, FTAG, &zsb, B_FALSE);
        if (error == 0) {
                error = zfsctl_unmount_snapshot(zsb, fullname, MNT_FORCE);
                zfs_sb_rele(zsb, FTAG);

                /* Allow ENOENT for consistency with upstream */
                if (error == ENOENT)
                        error = 0;
        }

        strfree(dsname);
        strfree(snapname);
        strfree(fullname);

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_value             short name of snapshot
 * zc_defer_destroy     mark for deferred destroy
 *
 * outputs:     none
 */
static int
zfs_ioc_destroy_snaps(zfs_cmd_t *zc)
{
        int err;

        if (snapshot_namecheck(zc->zc_value, NULL, NULL) != 0)
                return (EINVAL);
        err = dmu_objset_find(zc->zc_name,
            zfs_unmount_snap, zc->zc_value, DS_FIND_CHILDREN);
        if (err)
                return (err);
        return (dmu_snapshots_destroy(zc->zc_name, zc->zc_value,
            zc->zc_defer_destroy));
}

/*
 * inputs:
 * zc_name              name of dataset to destroy
 * zc_objset_type       type of objset
 * zc_defer_destroy     mark for deferred destroy
 *
 * outputs:             none
 */
static int
zfs_ioc_destroy(zfs_cmd_t *zc)
{
        int err;
        if (strchr(zc->zc_name, '@') && zc->zc_objset_type == DMU_OST_ZFS) {
                err = zfs_unmount_snap(zc->zc_name, NULL);
                if (err)
                        return (err);
        }

        err = dmu_objset_destroy(zc->zc_name, zc->zc_defer_destroy);
        if (zc->zc_objset_type == DMU_OST_ZVOL && err == 0)
                (void) zvol_remove_minor(zc->zc_name);
        return (err);
}

/*
 * inputs:
 * zc_name      name of dataset to rollback (to most recent snapshot)
 *
 * outputs:     none
 */
static int
zfs_ioc_rollback(zfs_cmd_t *zc)
{
        dsl_dataset_t *ds, *clone;
        int error;
        zfs_sb_t *zsb;
        char *clone_name;

        error = dsl_dataset_hold(zc->zc_name, FTAG, &ds);
        if (error)
                return (error);

        /* must not be a snapshot */
        if (dsl_dataset_is_snapshot(ds)) {
                dsl_dataset_rele(ds, FTAG);
                return (EINVAL);
        }

        /* must have a most recent snapshot */
        if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) {
                dsl_dataset_rele(ds, FTAG);
                return (EINVAL);
        }

        /*
         * Create clone of most recent snapshot.
         */
        clone_name = kmem_asprintf("%s/%%rollback", zc->zc_name);
        error = dmu_objset_clone(clone_name, ds->ds_prev, DS_FLAG_INCONSISTENT);
        if (error)
                goto out;

        error = dsl_dataset_own(clone_name, B_TRUE, FTAG, &clone);
        if (error)
                goto out;

        /*
         * Do clone swap.
         */
        if (get_zfs_sb(zc->zc_name, &zsb) == 0) {
                error = zfs_suspend_fs(zsb);
                if (error == 0) {
                        int resume_err;

                        if (dsl_dataset_tryown(ds, B_FALSE, FTAG)) {
                                error = dsl_dataset_clone_swap(clone, ds,
                                    B_TRUE);
                                dsl_dataset_disown(ds, FTAG);
                                ds = NULL;
                        } else {
                                error = EBUSY;
                        }
                        resume_err = zfs_resume_fs(zsb, zc->zc_name);
                        error = error ? error : resume_err;
                }
                deactivate_super(zsb->z_sb);
        } else {
                if (dsl_dataset_tryown(ds, B_FALSE, FTAG)) {
                        error = dsl_dataset_clone_swap(clone, ds, B_TRUE);
                        dsl_dataset_disown(ds, FTAG);
                        ds = NULL;
                } else {
                        error = EBUSY;
                }
        }

        /*
         * Destroy clone (which also closes it).
         */
        (void) dsl_dataset_destroy(clone, FTAG, B_FALSE);

out:
        strfree(clone_name);
        if (ds)
                dsl_dataset_rele(ds, FTAG);
        return (error);
}

/*
 * inputs:
 * zc_name      old name of dataset
 * zc_value     new name of dataset
 * zc_cookie    recursive flag (only valid for snapshots)
 *
 * outputs:     none
 */
static int
zfs_ioc_rename(zfs_cmd_t *zc)
{
        boolean_t recursive = zc->zc_cookie & 1;
        int err;

        zc->zc_value[sizeof (zc->zc_value) - 1] = '\0';
        if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0 ||
            strchr(zc->zc_value, '%'))
                return (EINVAL);

        /*
         * Unmount snapshot unless we're doing a recursive rename,
         * in which case the dataset code figures out which snapshots
         * to unmount.
         */
        if (!recursive && strchr(zc->zc_name, '@') != NULL &&
            zc->zc_objset_type == DMU_OST_ZFS) {
                err = zfs_unmount_snap(zc->zc_name, NULL);
                if (err)
                        return (err);
        }

        err = dmu_objset_rename(zc->zc_name, zc->zc_value, recursive);
        if ((err == 0) && (zc->zc_objset_type == DMU_OST_ZVOL)) {
                (void) zvol_remove_minor(zc->zc_name);
                (void) zvol_create_minor(zc->zc_value);
        }

        return (err);
}

static int
zfs_check_settable(const char *dsname, nvpair_t *pair, cred_t *cr)
{
        const char *propname = nvpair_name(pair);
        boolean_t issnap = (strchr(dsname, '@') != NULL);
        zfs_prop_t prop = zfs_name_to_prop(propname);
        uint64_t intval;
        int err;

        if (prop == ZPROP_INVAL) {
                if (zfs_prop_user(propname)) {
                        if ((err = zfs_secpolicy_write_perms(dsname,
                            ZFS_DELEG_PERM_USERPROP, cr)))
                                return (err);
                        return (0);
                }

                if (!issnap && zfs_prop_userquota(propname)) {
                        const char *perm = NULL;
                        const char *uq_prefix =
                            zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA];
                        const char *gq_prefix =
                            zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA];

                        if (strncmp(propname, uq_prefix,
                            strlen(uq_prefix)) == 0) {
                                perm = ZFS_DELEG_PERM_USERQUOTA;
                        } else if (strncmp(propname, gq_prefix,
                            strlen(gq_prefix)) == 0) {
                                perm = ZFS_DELEG_PERM_GROUPQUOTA;
                        } else {
                                /* USERUSED and GROUPUSED are read-only */
                                return (EINVAL);
                        }

                        if ((err = zfs_secpolicy_write_perms(dsname, perm, cr)))
                                return (err);
                        return (0);
                }

                return (EINVAL);
        }

        if (issnap)
                return (EINVAL);

        if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
                /*
                 * dsl_prop_get_all_impl() returns properties in this
                 * format.
                 */
                nvlist_t *attrs;
                VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
                VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                    &pair) == 0);
        }

        /*
         * Check that this value is valid for this pool version
         */
        switch (prop) {
        case ZFS_PROP_COMPRESSION:
                /*
                 * If the user specified gzip compression, make sure
                 * the SPA supports it. We ignore any errors here since
                 * we'll catch them later.
                 */
                if (nvpair_type(pair) == DATA_TYPE_UINT64 &&
                    nvpair_value_uint64(pair, &intval) == 0) {
                        if (intval >= ZIO_COMPRESS_GZIP_1 &&
                            intval <= ZIO_COMPRESS_GZIP_9 &&
                            zfs_earlier_version(dsname,
                            SPA_VERSION_GZIP_COMPRESSION)) {
                                return (ENOTSUP);
                        }

                        if (intval == ZIO_COMPRESS_ZLE &&
                            zfs_earlier_version(dsname,
                            SPA_VERSION_ZLE_COMPRESSION))
                                return (ENOTSUP);

                        /*
                         * If this is a bootable dataset then
                         * verify that the compression algorithm
                         * is supported for booting. We must return
                         * something other than ENOTSUP since it
                         * implies a downrev pool version.
                         */
                        if (zfs_is_bootfs(dsname) &&
                            !BOOTFS_COMPRESS_VALID(intval)) {
                                return (ERANGE);
                        }
                }
                break;

        case ZFS_PROP_COPIES:
                if (zfs_earlier_version(dsname, SPA_VERSION_DITTO_BLOCKS))
                        return (ENOTSUP);
                break;

        case ZFS_PROP_DEDUP:
                if (zfs_earlier_version(dsname, SPA_VERSION_DEDUP))
                        return (ENOTSUP);
                break;

        case ZFS_PROP_SHARESMB:
                if (zpl_earlier_version(dsname, ZPL_VERSION_FUID))
                        return (ENOTSUP);
                break;

        case ZFS_PROP_ACLINHERIT:
                if (nvpair_type(pair) == DATA_TYPE_UINT64 &&
                    nvpair_value_uint64(pair, &intval) == 0) {
                        if (intval == ZFS_ACL_PASSTHROUGH_X &&
                            zfs_earlier_version(dsname,
                            SPA_VERSION_PASSTHROUGH_X))
                                return (ENOTSUP);
                }
                break;
        default:
                break;
        }

        return (zfs_secpolicy_setprop(dsname, prop, pair, CRED()));
}

/*
 * Removes properties from the given props list that fail permission checks
 * needed to clear them and to restore them in case of a receive error. For each
 * property, make sure we have both set and inherit permissions.
 *
 * Returns the first error encountered if any permission checks fail. If the
 * caller provides a non-NULL errlist, it also gives the complete list of names
 * of all the properties that failed a permission check along with the
 * corresponding error numbers. The caller is responsible for freeing the
 * returned errlist.
 *
 * If every property checks out successfully, zero is returned and the list
 * pointed at by errlist is NULL.
 */
static int
zfs_check_clearable(char *dataset, nvlist_t *props, nvlist_t **errlist)
{
        zfs_cmd_t *zc;
        nvpair_t *pair, *next_pair;
        nvlist_t *errors;
        int err, rv = 0;

        if (props == NULL)
                return (0);

        VERIFY(nvlist_alloc(&errors, NV_UNIQUE_NAME, KM_SLEEP) == 0);

        zc = kmem_alloc(sizeof (zfs_cmd_t), KM_SLEEP | KM_NODEBUG);
        (void) strcpy(zc->zc_name, dataset);
        pair = nvlist_next_nvpair(props, NULL);
        while (pair != NULL) {
                next_pair = nvlist_next_nvpair(props, pair);

                (void) strcpy(zc->zc_value, nvpair_name(pair));
                if ((err = zfs_check_settable(dataset, pair, CRED())) != 0 ||
                    (err = zfs_secpolicy_inherit(zc, CRED())) != 0) {
                        VERIFY(nvlist_remove_nvpair(props, pair) == 0);
                        VERIFY(nvlist_add_int32(errors,
                            zc->zc_value, err) == 0);
                }
                pair = next_pair;
        }
        kmem_free(zc, sizeof (zfs_cmd_t));

        if ((pair = nvlist_next_nvpair(errors, NULL)) == NULL) {
                nvlist_free(errors);
                errors = NULL;
        } else {
                VERIFY(nvpair_value_int32(pair, &rv) == 0);
        }

        if (errlist == NULL)
                nvlist_free(errors);
        else
                *errlist = errors;

        return (rv);
}

static boolean_t
propval_equals(nvpair_t *p1, nvpair_t *p2)
{
        if (nvpair_type(p1) == DATA_TYPE_NVLIST) {
                /* dsl_prop_get_all_impl() format */
                nvlist_t *attrs;
                VERIFY(nvpair_value_nvlist(p1, &attrs) == 0);
                VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                    &p1) == 0);
        }

        if (nvpair_type(p2) == DATA_TYPE_NVLIST) {
                nvlist_t *attrs;
                VERIFY(nvpair_value_nvlist(p2, &attrs) == 0);
                VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
                    &p2) == 0);
        }

        if (nvpair_type(p1) != nvpair_type(p2))
                return (B_FALSE);

        if (nvpair_type(p1) == DATA_TYPE_STRING) {
                char *valstr1, *valstr2;

                VERIFY(nvpair_value_string(p1, (char **)&valstr1) == 0);
                VERIFY(nvpair_value_string(p2, (char **)&valstr2) == 0);
                return (strcmp(valstr1, valstr2) == 0);
        } else {
                uint64_t intval1, intval2;

                VERIFY(nvpair_value_uint64(p1, &intval1) == 0);
                VERIFY(nvpair_value_uint64(p2, &intval2) == 0);
                return (intval1 == intval2);
        }
}

/*
 * Remove properties from props if they are not going to change (as determined
 * by comparison with origprops). Remove them from origprops as well, since we
 * do not need to clear or restore properties that won't change.
 */
static void
props_reduce(nvlist_t *props, nvlist_t *origprops)
{
        nvpair_t *pair, *next_pair;

        if (origprops == NULL)
                return; /* all props need to be received */

        pair = nvlist_next_nvpair(props, NULL);
        while (pair != NULL) {
                const char *propname = nvpair_name(pair);
                nvpair_t *match;

                next_pair = nvlist_next_nvpair(props, pair);

                if ((nvlist_lookup_nvpair(origprops, propname,
                    &match) != 0) || !propval_equals(pair, match))
                        goto next; /* need to set received value */

                /* don't clear the existing received value */
                (void) nvlist_remove_nvpair(origprops, match);
                /* don't bother receiving the property */
                (void) nvlist_remove_nvpair(props, pair);
next:
                pair = next_pair;
        }
}

#ifdef  DEBUG
static boolean_t zfs_ioc_recv_inject_err;
#endif

/*
 * inputs:
 * zc_name              name of containing filesystem
 * zc_nvlist_src{_size} nvlist of properties to apply
 * zc_value             name of snapshot to create
 * zc_string            name of clone origin (if DRR_FLAG_CLONE)
 * zc_cookie            file descriptor to recv from
 * zc_begin_record      the BEGIN record of the stream (not byteswapped)
 * zc_guid              force flag
 * zc_cleanup_fd        cleanup-on-exit file descriptor
 * zc_action_handle     handle for this guid/ds mapping (or zero on first call)
 *
 * outputs:
 * zc_cookie            number of bytes read
 * zc_nvlist_dst{_size} error for each unapplied received property
 * zc_obj               zprop_errflags_t
 * zc_action_handle     handle for this guid/ds mapping
 */
static int
zfs_ioc_recv(zfs_cmd_t *zc)
{
        file_t *fp;
        objset_t *os;
        dmu_recv_cookie_t drc;
        boolean_t force = (boolean_t)zc->zc_guid;
        int fd;
        int error = 0;
        int props_error = 0;
        nvlist_t *errors;
        offset_t off;
        nvlist_t *props = NULL; /* sent properties */
        nvlist_t *origprops = NULL; /* existing properties */
        objset_t *origin = NULL;
        char *tosnap;
        char tofs[ZFS_MAXNAMELEN];
        boolean_t first_recvd_props = B_FALSE;

        if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0 ||
            strchr(zc->zc_value, '@') == NULL ||
            strchr(zc->zc_value, '%'))
                return (EINVAL);

        (void) strcpy(tofs, zc->zc_value);
        tosnap = strchr(tofs, '@');
        *tosnap++ = '\0';

        if (zc->zc_nvlist_src != 0 &&
            (error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
            zc->zc_iflags, &props)) != 0)
                return (error);

        fd = zc->zc_cookie;
        fp = getf(fd);
        if (fp == NULL) {
                nvlist_free(props);
                return (EBADF);
        }

        VERIFY(nvlist_alloc(&errors, NV_UNIQUE_NAME, KM_SLEEP) == 0);

        if (props && dmu_objset_hold(tofs, FTAG, &os) == 0) {
                if ((spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS) &&
                    !dsl_prop_get_hasrecvd(os)) {
                        first_recvd_props = B_TRUE;
                }

                /*
                 * If new received properties are supplied, they are to
                 * completely replace the existing received properties, so stash
                 * away the existing ones.
                 */
                if (dsl_prop_get_received(os, &origprops) == 0) {
                        nvlist_t *errlist = NULL;
                        /*
                         * Don't bother writing a property if its value won't
                         * change (and avoid the unnecessary security checks).
                         *
                         * The first receive after SPA_VERSION_RECVD_PROPS is a
                         * special case where we blow away all local properties
                         * regardless.
                         */
                        if (!first_recvd_props)
                                props_reduce(props, origprops);
                        if (zfs_check_clearable(tofs, origprops,
                            &errlist) != 0)
                                (void) nvlist_merge(errors, errlist, 0);
                        nvlist_free(errlist);
                }

                dmu_objset_rele(os, FTAG);
        }

        if (zc->zc_string[0]) {
                error = dmu_objset_hold(zc->zc_string, FTAG, &origin);
                if (error)
                        goto out;
        }

        error = dmu_recv_begin(tofs, tosnap, zc->zc_top_ds,
            &zc->zc_begin_record, force, origin, &drc);
        if (origin)
                dmu_objset_rele(origin, FTAG);
        if (error)
                goto out;

        /*
         * Set properties before we receive the stream so that they are applied
         * to the new data. Note that we must call dmu_recv_stream() if
         * dmu_recv_begin() succeeds.
         */
        if (props) {
                nvlist_t *errlist;

                if (dmu_objset_from_ds(drc.drc_logical_ds, &os) == 0) {
                        if (drc.drc_newfs) {
                                if (spa_version(os->os_spa) >=
                                    SPA_VERSION_RECVD_PROPS)
                                        first_recvd_props = B_TRUE;
                        } else if (origprops != NULL) {
                                if (clear_received_props(os, tofs, origprops,
                                    first_recvd_props ? NULL : props) != 0)
                                        zc->zc_obj |= ZPROP_ERR_NOCLEAR;
                        } else {
                                zc->zc_obj |= ZPROP_ERR_NOCLEAR;
                        }
                        dsl_prop_set_hasrecvd(os);
                } else if (!drc.drc_newfs) {
                        zc->zc_obj |= ZPROP_ERR_NOCLEAR;
                }

                (void) zfs_set_prop_nvlist(tofs, ZPROP_SRC_RECEIVED,
                    props, &errlist);
                (void) nvlist_merge(errors, errlist, 0);
                nvlist_free(errlist);
        }

        if (fit_error_list(zc, &errors) != 0 || put_nvlist(zc, errors) != 0) {
                /*
                 * Caller made zc->zc_nvlist_dst less than the minimum expected
                 * size or supplied an invalid address.
                 */
                props_error = EINVAL;
        }

        off = fp->f_offset;
        error = dmu_recv_stream(&drc, fp->f_vnode, &off, zc->zc_cleanup_fd,
            &zc->zc_action_handle);

        if (error == 0) {
                zfs_sb_t *zsb = NULL;

                if (get_zfs_sb(tofs, &zsb) == 0) {
                        /* online recv */
                        int end_err;

                        error = zfs_suspend_fs(zsb);
                        /*
                         * If the suspend fails, then the recv_end will
                         * likely also fail, and clean up after itself.
                         */
                        end_err = dmu_recv_end(&drc);
                        if (error == 0)
                                error = zfs_resume_fs(zsb, tofs);
                        error = error ? error : end_err;
                        deactivate_super(zsb->z_sb);
                } else {
                        error = dmu_recv_end(&drc);
                }
        }

        zc->zc_cookie = off - fp->f_offset;
        if (VOP_SEEK(fp->f_vnode, fp->f_offset, &off, NULL) == 0)
                fp->f_offset = off;

#ifdef  DEBUG
        if (zfs_ioc_recv_inject_err) {
                zfs_ioc_recv_inject_err = B_FALSE;
                error = 1;
        }
#endif
        /*
         * On error, restore the original props.
         */
        if (error && props) {
                if (dmu_objset_hold(tofs, FTAG, &os) == 0) {
                        if (clear_received_props(os, tofs, props, NULL) != 0) {
                                /*
                                 * We failed to clear the received properties.
                                 * Since we may have left a $recvd value on the
                                 * system, we can't clear the $hasrecvd flag.
                                 */
                                zc->zc_obj |= ZPROP_ERR_NORESTORE;
                        } else if (first_recvd_props) {
                                dsl_prop_unset_hasrecvd(os);
                        }
                        dmu_objset_rele(os, FTAG);
                } else if (!drc.drc_newfs) {
                        /* We failed to clear the received properties. */
                        zc->zc_obj |= ZPROP_ERR_NORESTORE;
                }

                if (origprops == NULL && !drc.drc_newfs) {
                        /* We failed to stash the original properties. */
                        zc->zc_obj |= ZPROP_ERR_NORESTORE;
                }

                /*
                 * dsl_props_set() will not convert RECEIVED to LOCAL on or
                 * after SPA_VERSION_RECVD_PROPS, so we need to specify LOCAL
                 * explictly if we're restoring local properties cleared in the
                 * first new-style receive.
                 */
                if (origprops != NULL &&
                    zfs_set_prop_nvlist(tofs, (first_recvd_props ?
                    ZPROP_SRC_LOCAL : ZPROP_SRC_RECEIVED),
                    origprops, NULL) != 0) {
                        /*
                         * We stashed the original properties but failed to
                         * restore them.
                         */
                        zc->zc_obj |= ZPROP_ERR_NORESTORE;
                }
        }
out:
        nvlist_free(props);
        nvlist_free(origprops);
        nvlist_free(errors);
        releasef(fd);

        if (error == 0)
                error = props_error;

        return (error);
}

/*
 * inputs:
 * zc_name      name of snapshot to send
 * zc_cookie    file descriptor to send stream to
 * zc_obj       fromorigin flag (mutually exclusive with zc_fromobj)
 * zc_sendobj   objsetid of snapshot to send
 * zc_fromobj   objsetid of incremental fromsnap (may be zero)
 *
 * outputs: none
 */
static int
zfs_ioc_send(zfs_cmd_t *zc)
{
        objset_t *fromsnap = NULL;
        objset_t *tosnap;
        file_t *fp;
        int error;
        offset_t off;
        dsl_dataset_t *ds;
        dsl_dataset_t *dsfrom = NULL;
        spa_t *spa;
        dsl_pool_t *dp;

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error)
                return (error);

        dp = spa_get_dsl(spa);
        rw_enter(&dp->dp_config_rwlock, RW_READER);
        error = dsl_dataset_hold_obj(dp, zc->zc_sendobj, FTAG, &ds);
        rw_exit(&dp->dp_config_rwlock);
        if (error) {
                spa_close(spa, FTAG);
                return (error);
        }

        error = dmu_objset_from_ds(ds, &tosnap);
        if (error) {
                dsl_dataset_rele(ds, FTAG);
                spa_close(spa, FTAG);
                return (error);
        }

        if (zc->zc_fromobj != 0) {
                rw_enter(&dp->dp_config_rwlock, RW_READER);
                error = dsl_dataset_hold_obj(dp, zc->zc_fromobj, FTAG, &dsfrom);
                rw_exit(&dp->dp_config_rwlock);
                spa_close(spa, FTAG);
                if (error) {
                        dsl_dataset_rele(ds, FTAG);
                        return (error);
                }
                error = dmu_objset_from_ds(dsfrom, &fromsnap);
                if (error) {
                        dsl_dataset_rele(dsfrom, FTAG);
                        dsl_dataset_rele(ds, FTAG);
                        return (error);
                }
        } else {
                spa_close(spa, FTAG);
        }

        fp = getf(zc->zc_cookie);
        if (fp == NULL) {
                dsl_dataset_rele(ds, FTAG);
                if (dsfrom)
                        dsl_dataset_rele(dsfrom, FTAG);
                return (EBADF);
        }

        off = fp->f_offset;
        error = dmu_sendbackup(tosnap, fromsnap, zc->zc_obj, fp->f_vnode, &off);

        if (VOP_SEEK(fp->f_vnode, fp->f_offset, &off, NULL) == 0)
                fp->f_offset = off;
        releasef(zc->zc_cookie);
        if (dsfrom)
                dsl_dataset_rele(dsfrom, FTAG);
        dsl_dataset_rele(ds, FTAG);
        return (error);
}

static int
zfs_ioc_inject_fault(zfs_cmd_t *zc)
{
        int id, error;

        error = zio_inject_fault(zc->zc_name, (int)zc->zc_guid, &id,
            &zc->zc_inject_record);

        if (error == 0)
                zc->zc_guid = (uint64_t)id;

        return (error);
}

static int
zfs_ioc_clear_fault(zfs_cmd_t *zc)
{
        return (zio_clear_fault((int)zc->zc_guid));
}

static int
zfs_ioc_inject_list_next(zfs_cmd_t *zc)
{
        int id = (int)zc->zc_guid;
        int error;

        error = zio_inject_list_next(&id, zc->zc_name, sizeof (zc->zc_name),
            &zc->zc_inject_record);

        zc->zc_guid = id;

        return (error);
}

static int
zfs_ioc_error_log(zfs_cmd_t *zc)
{
        spa_t *spa;
        int error;
        size_t count = (size_t)zc->zc_nvlist_dst_size;

        if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
                return (error);

        error = spa_get_errlog(spa, (void *)(uintptr_t)zc->zc_nvlist_dst,
            &count);
        if (error == 0)
                zc->zc_nvlist_dst_size = count;
        else
                zc->zc_nvlist_dst_size = spa_get_errlog_size(spa);

        spa_close(spa, FTAG);

        return (error);
}

static int
zfs_ioc_clear(zfs_cmd_t *zc)
{
        spa_t *spa;
        vdev_t *vd;
        int error;

        /*
         * On zpool clear we also fix up missing slogs
         */
        mutex_enter(&spa_namespace_lock);
        spa = spa_lookup(zc->zc_name);
        if (spa == NULL) {
                mutex_exit(&spa_namespace_lock);
                return (EIO);
        }
        if (spa_get_log_state(spa) == SPA_LOG_MISSING) {
                /* we need to let spa_open/spa_load clear the chains */
                spa_set_log_state(spa, SPA_LOG_CLEAR);
        }
        spa->spa_last_open_failed = 0;
        mutex_exit(&spa_namespace_lock);

        if (zc->zc_cookie & ZPOOL_NO_REWIND) {
                error = spa_open(zc->zc_name, &spa, FTAG);
        } else {
                nvlist_t *policy;
                nvlist_t *config = NULL;

                if (zc->zc_nvlist_src == 0)
                        return (EINVAL);

                if ((error = get_nvlist(zc->zc_nvlist_src,
                    zc->zc_nvlist_src_size, zc->zc_iflags, &policy)) == 0) {
                        error = spa_open_rewind(zc->zc_name, &spa, FTAG,
                            policy, &config);
                        if (config != NULL) {
                                int err;

                                if ((err = put_nvlist(zc, config)) != 0)
                                        error = err;
                                nvlist_free(config);
                        }
                        nvlist_free(policy);
                }
        }

        if (error)
                return (error);

        spa_vdev_state_enter(spa, SCL_NONE);

        if (zc->zc_guid == 0) {
                vd = NULL;
        } else {
                vd = spa_lookup_by_guid(spa, zc->zc_guid, B_TRUE);
                if (vd == NULL) {
                        (void) spa_vdev_state_exit(spa, NULL, ENODEV);
                        spa_close(spa, FTAG);
                        return (ENODEV);
                }
        }

        vdev_clear(spa, vd);

        (void) spa_vdev_state_exit(spa, NULL, 0);

        /*
         * Resume any suspended I/Os.
         */
        if (zio_resume(spa) != 0)
                error = EIO;

        spa_close(spa, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name      name of filesystem
 * zc_value     name of origin snapshot
 *
 * outputs:
 * zc_string    name of conflicting snapshot, if there is one
 */
static int
zfs_ioc_promote(zfs_cmd_t *zc)
{
        char *cp;

        /*
         * We don't need to unmount *all* the origin fs's snapshots, but
         * it's easier.
         */
        cp = strchr(zc->zc_value, '@');
        if (cp)
                *cp = '\0';
        (void) dmu_objset_find(zc->zc_value,
            zfs_unmount_snap, NULL, DS_FIND_SNAPSHOTS);
        return (dsl_dataset_promote(zc->zc_name, zc->zc_string));
}

/*
 * Retrieve a single {user|group}{used|quota}@... property.
 *
 * inputs:
 * zc_name      name of filesystem
 * zc_objset_type zfs_userquota_prop_t
 * zc_value     domain name (eg. "S-1-234-567-89")
 * zc_guid      RID/UID/GID
 *
 * outputs:
 * zc_cookie    property value
 */
static int
zfs_ioc_userspace_one(zfs_cmd_t *zc)
{
        zfs_sb_t *zsb;
        int error;

        if (zc->zc_objset_type >= ZFS_NUM_USERQUOTA_PROPS)
                return (EINVAL);

        error = zfs_sb_hold(zc->zc_name, FTAG, &zsb, B_FALSE);
        if (error)
                return (error);

        error = zfs_userspace_one(zsb,
            zc->zc_objset_type, zc->zc_value, zc->zc_guid, &zc->zc_cookie);
        zfs_sb_rele(zsb, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_cookie            zap cursor
 * zc_objset_type       zfs_userquota_prop_t
 * zc_nvlist_dst[_size] buffer to fill (not really an nvlist)
 *
 * outputs:
 * zc_nvlist_dst[_size] data buffer (array of zfs_useracct_t)
 * zc_cookie    zap cursor
 */
static int
zfs_ioc_userspace_many(zfs_cmd_t *zc)
{
        zfs_sb_t *zsb;
        int bufsize = zc->zc_nvlist_dst_size;
        int error;
        void *buf;

        if (bufsize <= 0)
                return (ENOMEM);

        error = zfs_sb_hold(zc->zc_name, FTAG, &zsb, B_FALSE);
        if (error)
                return (error);

        buf = vmem_alloc(bufsize, KM_SLEEP);

        error = zfs_userspace_many(zsb, zc->zc_objset_type, &zc->zc_cookie,
            buf, &zc->zc_nvlist_dst_size);

        if (error == 0) {
                error = xcopyout(buf,
                    (void *)(uintptr_t)zc->zc_nvlist_dst,
                    zc->zc_nvlist_dst_size);
        }
        vmem_free(buf, bufsize);
        zfs_sb_rele(zsb, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 *
 * outputs:
 * none
 */
static int
zfs_ioc_userspace_upgrade(zfs_cmd_t *zc)
{
        objset_t *os;
        int error = 0;
        zfs_sb_t *zsb;

        if (get_zfs_sb(zc->zc_name, &zsb) == 0) {
                if (!dmu_objset_userused_enabled(zsb->z_os)) {
                        /*
                         * If userused is not enabled, it may be because the
                         * objset needs to be closed & reopened (to grow the
                         * objset_phys_t).  Suspend/resume the fs will do that.
                         */
                        error = zfs_suspend_fs(zsb);
                        if (error == 0)
                                error = zfs_resume_fs(zsb, zc->zc_name);
                }
                if (error == 0)
                        error = dmu_objset_userspace_upgrade(zsb->z_os);
                deactivate_super(zsb->z_sb);
        } else {
                /* XXX kind of reading contents without owning */
                error = dmu_objset_hold(zc->zc_name, FTAG, &os);
                if (error)
                        return (error);

                error = dmu_objset_userspace_upgrade(os);
                dmu_objset_rele(os, FTAG);
        }

        return (error);
}

static int
zfs_ioc_share(zfs_cmd_t *zc)
{
        return (ENOSYS);
}

ace_t full_access[] = {
        {(uid_t)-1, ACE_ALL_PERMS, ACE_EVERYONE, 0}
};

/*
 * inputs:
 * zc_name              name of containing filesystem
 * zc_obj               object # beyond which we want next in-use object #
 *
 * outputs:
 * zc_obj               next in-use object #
 */
static int
zfs_ioc_next_obj(zfs_cmd_t *zc)
{
        objset_t *os = NULL;
        int error;

        error = dmu_objset_hold(zc->zc_name, FTAG, &os);
        if (error)
                return (error);

        error = dmu_object_next(os, &zc->zc_obj, B_FALSE,
            os->os_dsl_dataset->ds_phys->ds_prev_snap_txg);

        dmu_objset_rele(os, FTAG);
        return (error);
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_value             prefix name for snapshot
 * zc_cleanup_fd        cleanup-on-exit file descriptor for calling process
 *
 * outputs:
 */
static int
zfs_ioc_tmp_snapshot(zfs_cmd_t *zc)
{
        char *snap_name;
        int error;

        snap_name = kmem_asprintf("%s-%016llx", zc->zc_value,
            (u_longlong_t)ddi_get_lbolt64());

        if (strlen(snap_name) >= MAXNAMELEN) {
                strfree(snap_name);
                return (E2BIG);
        }

        error = dmu_objset_snapshot(zc->zc_name, snap_name, snap_name,
            NULL, B_FALSE, B_TRUE, zc->zc_cleanup_fd);
        if (error != 0) {
                strfree(snap_name);
                return (error);
        }

        (void) strcpy(zc->zc_value, snap_name);
        strfree(snap_name);
        return (0);
}

/*
 * inputs:
 * zc_name              name of "to" snapshot
 * zc_value             name of "from" snapshot
 * zc_cookie            file descriptor to write diff data on
 *
 * outputs:
 * dmu_diff_record_t's to the file descriptor
 */
static int
zfs_ioc_diff(zfs_cmd_t *zc)
{
        objset_t *fromsnap;
        objset_t *tosnap;
        file_t *fp;
        offset_t off;
        int error;

        error = dmu_objset_hold(zc->zc_name, FTAG, &tosnap);
        if (error)
                return (error);

        error = dmu_objset_hold(zc->zc_value, FTAG, &fromsnap);
        if (error) {
                dmu_objset_rele(tosnap, FTAG);
                return (error);
        }

        fp = getf(zc->zc_cookie);
        if (fp == NULL) {
                dmu_objset_rele(fromsnap, FTAG);
                dmu_objset_rele(tosnap, FTAG);
                return (EBADF);
        }

        off = fp->f_offset;

        error = dmu_diff(tosnap, fromsnap, fp->f_vnode, &off);

        if (VOP_SEEK(fp->f_vnode, fp->f_offset, &off, NULL) == 0)
                fp->f_offset = off;
        releasef(zc->zc_cookie);

        dmu_objset_rele(fromsnap, FTAG);
        dmu_objset_rele(tosnap, FTAG);
        return (error);
}

/*
 * Remove all ACL files in shares dir
 */
#ifdef HAVE_SMB_SHARE
static int
zfs_smb_acl_purge(znode_t *dzp)
{
        zap_cursor_t    zc;
        zap_attribute_t zap;
        zfs_sb_t *zsb = ZTOZSB(dzp);
        int error;

        for (zap_cursor_init(&zc, zsb->z_os, dzp->z_id);
            (error = zap_cursor_retrieve(&zc, &zap)) == 0;
            zap_cursor_advance(&zc)) {
                if ((error = VOP_REMOVE(ZTOV(dzp), zap.za_name, kcred,
                    NULL, 0)) != 0)
                        break;
        }
        zap_cursor_fini(&zc);
        return (error);
}
#endif /* HAVE_SMB_SHARE */

static int
zfs_ioc_smb_acl(zfs_cmd_t *zc)
{
#ifdef HAVE_SMB_SHARE
        vnode_t *vp;
        znode_t *dzp;
        vnode_t *resourcevp = NULL;
        znode_t *sharedir;
        zfs_sb_t *zsb;
        nvlist_t *nvlist;
        char *src, *target;
        vattr_t vattr;
        vsecattr_t vsec;
        int error = 0;

        if ((error = lookupname(zc->zc_value, UIO_SYSSPACE,
            NO_FOLLOW, NULL, &vp)) != 0)
                return (error);

        /* Now make sure mntpnt and dataset are ZFS */

        if (vp->v_vfsp->vfs_fstype != zfsfstype ||
            (strcmp((char *)refstr_value(vp->v_vfsp->vfs_resource),
            zc->zc_name) != 0)) {
                VN_RELE(vp);
                return (EINVAL);
        }

        dzp = VTOZ(vp);
        zsb = ZTOZSB(dzp);
        ZFS_ENTER(zsb);

        /*
         * Create share dir if its missing.
         */
        mutex_enter(&zsb->z_lock);
        if (zsb->z_shares_dir == 0) {
                dmu_tx_t *tx;

                tx = dmu_tx_create(zsb->z_os);
                dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, TRUE,
                    ZFS_SHARES_DIR);
                dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
                error = dmu_tx_assign(tx, TXG_WAIT);
                if (error) {
                        dmu_tx_abort(tx);
                } else {
                        error = zfs_create_share_dir(zsb, tx);
                        dmu_tx_commit(tx);
                }
                if (error) {
                        mutex_exit(&zsb->z_lock);
                        VN_RELE(vp);
                        ZFS_EXIT(zsb);
                        return (error);
                }
        }
        mutex_exit(&zsb->z_lock);

        ASSERT(zsb->z_shares_dir);
        if ((error = zfs_zget(zsb, zsb->z_shares_dir, &sharedir)) != 0) {
                VN_RELE(vp);
                ZFS_EXIT(zsb);
                return (error);
        }

        switch (zc->zc_cookie) {
        case ZFS_SMB_ACL_ADD:
                vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
                vattr.va_mode = S_IFREG|0777;
                vattr.va_uid = 0;
                vattr.va_gid = 0;

                vsec.vsa_mask = VSA_ACE;
                vsec.vsa_aclentp = &full_access;
                vsec.vsa_aclentsz = sizeof (full_access);
                vsec.vsa_aclcnt = 1;

                error = VOP_CREATE(ZTOV(sharedir), zc->zc_string,
                    &vattr, EXCL, 0, &resourcevp, kcred, 0, NULL, &vsec);
                if (resourcevp)
                        VN_RELE(resourcevp);
                break;

        case ZFS_SMB_ACL_REMOVE:
                error = VOP_REMOVE(ZTOV(sharedir), zc->zc_string, kcred,
                    NULL, 0);
                break;

        case ZFS_SMB_ACL_RENAME:
                if ((error = get_nvlist(zc->zc_nvlist_src,
                    zc->zc_nvlist_src_size, zc->zc_iflags, &nvlist)) != 0) {
                        VN_RELE(vp);
                        ZFS_EXIT(zsb);
                        return (error);
                }
                if (nvlist_lookup_string(nvlist, ZFS_SMB_ACL_SRC, &src) ||
                    nvlist_lookup_string(nvlist, ZFS_SMB_ACL_TARGET,
                    &target)) {
                        VN_RELE(vp);
                        VN_RELE(ZTOV(sharedir));
                        ZFS_EXIT(zsb);
                        nvlist_free(nvlist);
                        return (error);
                }
                error = VOP_RENAME(ZTOV(sharedir), src, ZTOV(sharedir), target,
                    kcred, NULL, 0);
                nvlist_free(nvlist);
                break;

        case ZFS_SMB_ACL_PURGE:
                error = zfs_smb_acl_purge(sharedir);
                break;

        default:
                error = EINVAL;
                break;
        }

        VN_RELE(vp);
        VN_RELE(ZTOV(sharedir));

        ZFS_EXIT(zsb);

        return (error);
#else
        return (ENOTSUP);
#endif /* HAVE_SMB_SHARE */
}

/*
 * inputs:
 * zc_name              name of filesystem
 * zc_value             short name of snap
 * zc_string            user-supplied tag for this hold
 * zc_cookie            recursive flag
 * zc_temphold          set if hold is temporary
 * zc_cleanup_fd        cleanup-on-exit file descriptor for calling process
 * zc_sendobj           if non-zero, the objid for zc_name@zc_value
 * zc_createtxg         if zc_sendobj is non-zero, snap must have zc_createtxg
 *
 * outputs:             none
 */
static int
zfs_ioc_hold(zfs_cmd_t *zc)
{
        boolean_t recursive = zc->zc_cookie;
        spa_t *spa;
        dsl_pool_t *dp;
        dsl_dataset_t *ds;
        int error;
        minor_t minor = 0;

        if (snapshot_namecheck(zc->zc_value, NULL, NULL) != 0)
                return (EINVAL);

        if (zc->zc_sendobj == 0) {
                return (dsl_dataset_user_hold(zc->zc_name, zc->zc_value,
                    zc->zc_string, recursive, zc->zc_temphold,
                    zc->zc_cleanup_fd));
        }

        if (recursive)
                return (EINVAL);

        error = spa_open(zc->zc_name, &spa, FTAG);
        if (error)
                return (error);

        dp = spa_get_dsl(spa);
        rw_enter(&dp->dp_config_rwlock, RW_READER);
        error = dsl_dataset_hold_obj(dp, zc->zc_sendobj, FTAG, &ds);
        rw_exit(&dp->dp_config_rwlock);
        spa_close(spa, FTAG);
        if (error)
                return (error);

        /*
         * Until we have a hold on this snapshot, it's possible that
         * zc_sendobj could've been destroyed and reused as part
         * of a later txg.  Make sure we're looking at the right object.
         */
        if (zc->zc_createtxg != ds->ds_phys->ds_creation_txg) {
                dsl_dataset_rele(ds, FTAG);
                return (ENOENT);
        }

        if (zc->zc_cleanup_fd != -1 && zc->zc_temphold) {
                error = zfs_onexit_fd_hold(zc->zc_cleanup_fd, &minor);
                if (error) {
                        dsl_dataset_rele(ds, FTAG);
                        return (error);
                }
        }

        error = dsl_dataset_user_hold_for_send(ds, zc->zc_string,
            zc->zc_temphold);
        if (minor != 0) {
                if (error == 0) {
                        dsl_register_onexit_hold_cleanup(ds, zc->zc_string,
                            minor);
                }
                zfs_onexit_fd_rele(zc->zc_cleanup_fd);
        }
        dsl_dataset_rele(ds, FTAG);

        return (error);
}

/*
 * inputs:
 * zc_name      name of dataset from which we're releasing a user hold
 * zc_value     short name of snap
 * zc_string    user-supplied tag for this hold
 * zc_cookie    recursive flag
 *
 * outputs:     none
 */
static int
zfs_ioc_release(zfs_cmd_t *zc)
{
        boolean_t recursive = zc->zc_cookie;

        if (snapshot_namecheck(zc->zc_value, NULL, NULL) != 0)
                return (EINVAL);

        return (dsl_dataset_user_release(zc->zc_name, zc->zc_value,
            zc->zc_string, recursive));
}

/*
 * inputs:
 * zc_name              name of filesystem
 *
 * outputs:
 * zc_nvlist_src{_size} nvlist of snapshot holds
 */
static int
zfs_ioc_get_holds(zfs_cmd_t *zc)
{
        nvlist_t *nvp;
        int error;

        if ((error = dsl_dataset_get_holds(zc->zc_name, &nvp)) == 0) {
                error = put_nvlist(zc, nvp);
                nvlist_free(nvp);
        }

        return (error);
}

/*
 * inputs:
 * zc_guid              flags (ZEVENT_NONBLOCK)
 *
 * outputs:
 * zc_nvlist_dst        next nvlist event
 * zc_cookie            dropped events since last get
 * zc_cleanup_fd        cleanup-on-exit file descriptor
 */
static int
zfs_ioc_events_next(zfs_cmd_t *zc)
{
        zfs_zevent_t *ze;
        nvlist_t *event = NULL;
        minor_t minor;
        uint64_t dropped = 0;
        int error;

        error = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
        if (error != 0)
                return (error);

        do {
                error = zfs_zevent_next(ze, &event,
                        &zc->zc_nvlist_dst_size, &dropped);
                if (event != NULL) {
                        zc->zc_cookie = dropped;
                        error = put_nvlist(zc, event);
                        nvlist_free(event);
                }

                if (zc->zc_guid & ZEVENT_NONBLOCK)
                        break;

                if ((error == 0) || (error != ENOENT))
                        break;

                error = zfs_zevent_wait(ze);
                if (error)
                        break;
        } while (1);

        zfs_zevent_fd_rele(zc->zc_cleanup_fd);

        return (error);
}

/*
 * outputs:
 * zc_cookie            cleared events count
 */
static int
zfs_ioc_events_clear(zfs_cmd_t *zc)
{
        int count;

        zfs_zevent_drain_all(&count);
        zc->zc_cookie = count;

        return 0;
}

/*
 * pool create, destroy, and export don't log the history as part of
 * zfsdev_ioctl, but rather zfs_ioc_pool_create, and zfs_ioc_pool_export
 * do the logging of those commands.
 */
static zfs_ioc_vec_t zfs_ioc_vec[] = {
        { zfs_ioc_pool_create, zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_destroy, zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_import, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_export, zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_configs, zfs_secpolicy_none, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_stats, zfs_secpolicy_read, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_tryimport, zfs_secpolicy_config, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_pool_scan, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_pool_freeze, zfs_secpolicy_config, NO_NAME, B_FALSE,
            POOL_CHECK_READONLY },
        { zfs_ioc_pool_upgrade, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_pool_get_history, zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_vdev_add, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_remove, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_set_state, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_attach, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_detach, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_setpath, zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_vdev_setfru,  zfs_secpolicy_config, POOL_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_objset_stats, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_objset_zplprops, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_dataset_list_next, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_snapshot_list_next, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_set_prop, zfs_secpolicy_none, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_create_minor, zfs_secpolicy_config, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_remove_minor, zfs_secpolicy_config, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_create, zfs_secpolicy_create, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_destroy, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_rollback, zfs_secpolicy_rollback, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_rename, zfs_secpolicy_rename, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_recv, zfs_secpolicy_receive, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_send, zfs_secpolicy_send, DATASET_NAME, B_TRUE,
            POOL_CHECK_NONE },
        { zfs_ioc_inject_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_clear_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_inject_list_next, zfs_secpolicy_inject, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_error_log, zfs_secpolicy_inject, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_clear, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_NONE },
        { zfs_ioc_promote, zfs_secpolicy_promote, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_destroy_snaps, zfs_secpolicy_destroy_snaps, DATASET_NAME,
            B_TRUE, POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_snapshot, zfs_secpolicy_snapshot, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_dsobj_to_dsname, zfs_secpolicy_diff, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_obj_to_path, zfs_secpolicy_diff, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_pool_set_props, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_pool_get_props, zfs_secpolicy_read, POOL_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_set_fsacl, zfs_secpolicy_fsacl, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_get_fsacl, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_share, zfs_secpolicy_share, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_inherit_prop, zfs_secpolicy_inherit, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_smb_acl, zfs_secpolicy_smb_acl, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_userspace_one, zfs_secpolicy_userspace_one, DATASET_NAME,
            B_FALSE, POOL_CHECK_NONE },
        { zfs_ioc_userspace_many, zfs_secpolicy_userspace_many, DATASET_NAME,
            B_FALSE, POOL_CHECK_NONE },
        { zfs_ioc_userspace_upgrade, zfs_secpolicy_userspace_upgrade,
            DATASET_NAME, B_FALSE, POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_hold, zfs_secpolicy_hold, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_release, zfs_secpolicy_release, DATASET_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_get_holds, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_objset_recvd_props, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_vdev_split, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_next_obj, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_diff, zfs_secpolicy_diff, DATASET_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_tmp_snapshot, zfs_secpolicy_tmp_snapshot, DATASET_NAME,
            B_FALSE, POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_obj_to_stats, zfs_secpolicy_diff, DATASET_NAME, B_FALSE,
            POOL_CHECK_SUSPENDED },
        { zfs_ioc_pool_reguid, zfs_secpolicy_config, POOL_NAME, B_TRUE,
            POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY },
        { zfs_ioc_events_next, zfs_secpolicy_config, NO_NAME, B_FALSE,
            POOL_CHECK_NONE },
        { zfs_ioc_events_clear, zfs_secpolicy_config, NO_NAME, B_FALSE,
            POOL_CHECK_NONE }
};

int
pool_status_check(const char *name, zfs_ioc_namecheck_t type,
    zfs_ioc_poolcheck_t check)
{
        spa_t *spa;
        int error;

        ASSERT(type == POOL_NAME || type == DATASET_NAME);

        if (check & POOL_CHECK_NONE)
                return (0);

        error = spa_open(name, &spa, FTAG);
        if (error == 0) {
                if ((check & POOL_CHECK_SUSPENDED) && spa_suspended(spa))
                        error = EAGAIN;
                else if ((check & POOL_CHECK_READONLY) && !spa_writeable(spa))
                        error = EROFS;
                spa_close(spa, FTAG);
        }
        return (error);
}

static void *
zfsdev_get_state_impl(minor_t minor, enum zfsdev_state_type which)
{
        zfsdev_state_t *zs;

        ASSERT(MUTEX_HELD(&zfsdev_state_lock));

        for (zs = list_head(&zfsdev_state_list); zs != NULL;
             zs = list_next(&zfsdev_state_list, zs)) {
                if (zs->zs_minor == minor) {
                        switch (which) {
                                case ZST_ONEXIT:  return (zs->zs_onexit);
                                case ZST_ZEVENT:  return (zs->zs_zevent);
                                case ZST_ALL:     return (zs);
                        }
                }
        }

        return NULL;
}

void *
zfsdev_get_state(minor_t minor, enum zfsdev_state_type which)
{
        void *ptr;

        mutex_enter(&zfsdev_state_lock);
        ptr = zfsdev_get_state_impl(minor, which);
        mutex_exit(&zfsdev_state_lock);

        return ptr;
}

minor_t
zfsdev_getminor(struct file *filp)
{
        ASSERT(filp != NULL);
        ASSERT(filp->private_data != NULL);

        return (((zfsdev_state_t *)filp->private_data)->zs_minor);
}

/*
 * Find a free minor number.  The zfsdev_state_list is expected to
 * be short since it is only a list of currently open file handles.
 */
minor_t
zfsdev_minor_alloc(void)
{
        static minor_t last_minor = 0;
        minor_t m;

        ASSERT(MUTEX_HELD(&zfsdev_state_lock));

        for (m = last_minor + 1; m != last_minor; m++) {
                if (m > ZFSDEV_MAX_MINOR)
                        m = 1;
                if (zfsdev_get_state_impl(m, ZST_ALL) == NULL) {
                        last_minor = m;
                        return (m);
                }
        }

        return (0);
}

static int
zfsdev_state_init(struct file *filp)
{
        zfsdev_state_t *zs;
        minor_t minor;

        ASSERT(MUTEX_HELD(&zfsdev_state_lock));

        minor = zfsdev_minor_alloc();
        if (minor == 0)
                return (ENXIO);

        zs = kmem_zalloc( sizeof(zfsdev_state_t), KM_SLEEP);
        if (zs == NULL)
                return (ENOMEM);

        zs->zs_file = filp;
        zs->zs_minor = minor;
        filp->private_data = zs;

        zfs_onexit_init((zfs_onexit_t **)&zs->zs_onexit);
        zfs_zevent_init((zfs_zevent_t **)&zs->zs_zevent);

        list_insert_tail(&zfsdev_state_list, zs);

        return (0);
}

static int
zfsdev_state_destroy(struct file *filp)
{
        zfsdev_state_t *zs;

        ASSERT(MUTEX_HELD(&zfsdev_state_lock));
        ASSERT(filp->private_data != NULL);

        zs = filp->private_data;
        zfs_onexit_destroy(zs->zs_onexit);
        zfs_zevent_destroy(zs->zs_zevent);

        list_remove(&zfsdev_state_list, zs);
        kmem_free(zs, sizeof(zfsdev_state_t));

        return 0;
}

static int
zfsdev_open(struct inode *ino, struct file *filp)
{
        int error;

        mutex_enter(&zfsdev_state_lock);
        error = zfsdev_state_init(filp);
        mutex_exit(&zfsdev_state_lock);

        return (-error);
}

static int
zfsdev_release(struct inode *ino, struct file *filp)
{
        int error;

        mutex_enter(&zfsdev_state_lock);
        error = zfsdev_state_destroy(filp);
        mutex_exit(&zfsdev_state_lock);

        return (-error);
}

static long
zfsdev_ioctl(struct file *filp, unsigned cmd, unsigned long arg)
{
        zfs_cmd_t *zc;
        uint_t vec;
        int error, rc, flag = 0;

        vec = cmd - ZFS_IOC;
        if (vec >= sizeof (zfs_ioc_vec) / sizeof (zfs_ioc_vec[0]))
                return (-EINVAL);

        zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP | KM_NODEBUG);

        error = ddi_copyin((void *)arg, zc, sizeof (zfs_cmd_t), flag);
        if (error != 0)
                error = EFAULT;

        if ((error == 0) && !(flag & FKIOCTL))
                error = zfs_ioc_vec[vec].zvec_secpolicy(zc, CRED());

        /*
         * Ensure that all pool/dataset names are valid before we pass down to
         * the lower layers.
         */
        if (error == 0) {
                zc->zc_name[sizeof (zc->zc_name) - 1] = '\0';
                zc->zc_iflags = flag & FKIOCTL;
                switch (zfs_ioc_vec[vec].zvec_namecheck) {
                case POOL_NAME:
                        if (pool_namecheck(zc->zc_name, NULL, NULL) != 0)
                                error = EINVAL;
                        error = pool_status_check(zc->zc_name,
                            zfs_ioc_vec[vec].zvec_namecheck,
                            zfs_ioc_vec[vec].zvec_pool_check);
                        break;

                case DATASET_NAME:
                        if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0)
                                error = EINVAL;
                        error = pool_status_check(zc->zc_name,
                            zfs_ioc_vec[vec].zvec_namecheck,
                            zfs_ioc_vec[vec].zvec_pool_check);
                        break;

                case NO_NAME:
                        break;
                }
        }

        if (error == 0)
                error = zfs_ioc_vec[vec].zvec_func(zc);

        rc = ddi_copyout(zc, (void *)arg, sizeof (zfs_cmd_t), flag);
        if (error == 0) {
                if (rc != 0)
                        error = EFAULT;
                if (zfs_ioc_vec[vec].zvec_his_log)
                        zfs_log_history(zc);
        }

        kmem_free(zc, sizeof (zfs_cmd_t));
        return (-error);
}

#ifdef CONFIG_COMPAT
static long
zfsdev_compat_ioctl(struct file *filp, unsigned cmd, unsigned long arg)
{
        return zfsdev_ioctl(filp, cmd, arg);
}
#else
#define zfsdev_compat_ioctl   NULL
#endif

static const struct file_operations zfsdev_fops = {
        .open            = zfsdev_open,
        .release         = zfsdev_release,
        .unlocked_ioctl  = zfsdev_ioctl,
        .compat_ioctl    = zfsdev_compat_ioctl,
        .owner           = THIS_MODULE,
};

static struct miscdevice zfs_misc = {
        .minor          = MISC_DYNAMIC_MINOR,
        .name           = ZFS_DRIVER,
        .fops           = &zfsdev_fops,
};

static int
zfs_attach(void)
{
        int error;

        mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL);
        list_create(&zfsdev_state_list, sizeof (zfsdev_state_t),
            offsetof(zfsdev_state_t, zs_next));

        error = misc_register(&zfs_misc);
        if (error) {
                printk(KERN_INFO "ZFS: misc_register() failed %d\n", error);
                return (error);
        }

        return (0);
}

static void
zfs_detach(void)
{
        int error;

        error = misc_deregister(&zfs_misc);
        if (error)
                printk(KERN_INFO "ZFS: misc_deregister() failed %d\n", error);

        mutex_destroy(&zfsdev_state_lock);
        list_destroy(&zfsdev_state_list);
}

uint_t zfs_fsyncer_key;
extern uint_t rrw_tsd_key;

#ifdef DEBUG
#define ZFS_DEBUG_STR   " (DEBUG mode)"
#else
#define ZFS_DEBUG_STR   ""
#endif

int
_init(void)
{
        int error;

        spa_init(FREAD | FWRITE);
        zfs_init();

        if ((error = zvol_init()) != 0)
                goto out1;

        if ((error = zfs_attach()) != 0)
                goto out2;

        tsd_create(&zfs_fsyncer_key, NULL);
        tsd_create(&rrw_tsd_key, NULL);

        printk(KERN_NOTICE "ZFS: Loaded module v%s-%s%s, "
               "ZFS pool version %s, ZFS filesystem version %s\n",
               ZFS_META_VERSION, ZFS_META_RELEASE, ZFS_DEBUG_STR,
               SPA_VERSION_STRING, ZPL_VERSION_STRING);

        return (0);

out2:
        (void) zvol_fini();
out1:
        zfs_fini();
        spa_fini();
        printk(KERN_NOTICE "ZFS: Failed to Load ZFS Filesystem v%s-%s%s"
               ", rc = %d\n", ZFS_META_VERSION, ZFS_META_RELEASE,
               ZFS_DEBUG_STR, error);

        return (error);
}

int
_fini(void)
{
        zfs_detach();
        zvol_fini();
        zfs_fini();
        spa_fini();

        tsd_destroy(&zfs_fsyncer_key);
        tsd_destroy(&rrw_tsd_key);

        printk(KERN_NOTICE "ZFS: Unloaded module v%s-%s%s\n",
               ZFS_META_VERSION, ZFS_META_RELEASE, ZFS_DEBUG_STR);

        return (0);
}

#ifdef HAVE_SPL
spl_module_init(_init);
spl_module_exit(_fini);

MODULE_DESCRIPTION("ZFS");
MODULE_AUTHOR(ZFS_META_AUTHOR);
MODULE_LICENSE(ZFS_META_LICENSE);
#endif /* HAVE_SPL */