fs/zfs/zfs_ioctl.c

	zfs_ioctl.c revision 91ebeef555ce7f899b6270a3c2df47b51f7ad59a
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#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/zap.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/vdev.h>
#include <sys/vdev_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/zvol.h>
#include <sharefs/share.h>
#include <sys/zfs_znode.h>

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

extern struct modlfs zfs_modlfs;

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

ldi_ident_t zfs_li = NULL;
dev_info_t *zfs_dip;

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

typedef struct zfs_ioc_vec {
    zfs_ioc_func_t      *zvec_func;
    zfs_secpolicy_func_t    *zvec_secpolicy;
    enum {
        NO_NAME,
        POOL_NAME,
        DATASET_NAME
    } zvec_namecheck;
    boolean_t       zvec_his_log;
} zfs_ioc_vec_t;

/* _NOTE(PRINTFLIKE(4)) - this is printf-like, but lint is too whiney */
void
__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
{
    const char *newfile;
    char buf[256];
    va_list adx;

    /*
     * Get rid of annoying "../common/" prefix to filename.
     */
    newfile = strrchr(file, '/');
    if (newfile != NULL) {
        newfile = newfile + 1; /* Get rid of leading / */
    } else {
        newfile = file;
    }

    va_start(adx, fmt);
    (void) vsnprintf(buf, sizeof (buf), fmt, adx);
    va_end(adx);

    /*
     * To get this data, use the zfs-dprintf probe as so:
     * dtrace -q -n 'zfs-dprintf \
     *  /stringof(arg0) == "dbuf.c"/ \
     *  {printf("%s: %s", stringof(arg1), stringof(arg3))}'
     * arg0 = file name
     * arg1 = function name
     * arg2 = line number
     * arg3 = message
     */
    DTRACE_PROBE4(zfs__dprintf,
        char *, newfile, char *, func, int, line, char *, buf);
}

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 == NULL)
        return (NULL);

    buf = kmem_alloc(HIS_MAX_RECORD_LEN, KM_SLEEP);
    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);
}

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(const char *dataset, cred_t *cr)
{
    uint64_t zoned;
    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 (dsl_prop_get_integer(dataset, "zoned", &zoned, NULL))
        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);
}

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);
}

static int
zfs_secpolicy_setprop(const char *name, zfs_prop_t prop, cred_t *cr)
{
    /*
     * Check permissions for special properties.
     */
    switch (prop) {
    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(name, "zoned", &zoned,
                setpoint))
                return (EPERM);
            if (!zoned || strlen(name) <= strlen(setpoint))
                return (EPERM);
        }
        break;
    }

    return (zfs_secpolicy_write_perms(name, 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)
{
    int error;
    error = zfs_secpolicy_write_perms(zc->zc_name,
        ZFS_DELEG_PERM_ROLLBACK, cr);
    if (error == 0)
        error = zfs_secpolicy_write_perms(zc->zc_name,
            ZFS_DELEG_PERM_MOUNT, cr);
    return (error);
}

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

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

    if (secpolicy_nfs(CRED()) == 0) {
        return (0);
    } else {
        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));
    }
}

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));
}

/*
 * Must have sys_config privilege to check the iscsi permission
 */
/* ARGSUSED */
static int
zfs_secpolicy_iscsi(zfs_cmd_t *zc, cred_t *cr)
{
    return (secpolicy_zfs(cr));
}

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_open(zc->zc_name, DMU_OST_ANY,
        DS_MODE_STANDARD | DS_MODE_READONLY, &clone);

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

        rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
        error = dsl_dataset_open_obj(dd->dd_pool,
            dd->dd_phys->dd_clone_parent_obj, NULL,
            DS_MODE_NONE, FTAG, &pclone);
        rw_exit(&dd->dd_pool->dp_config_rwlock);
        if (error) {
            dmu_objset_close(clone);
            return (error);
        }

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

        dsl_dataset_name(pclone, parentname);
        dmu_objset_close(clone);
        dsl_dataset_close(pclone, DS_MODE_NONE, 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)
{
    int error;

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

    error = zfs_secpolicy_write_perms(name,
        ZFS_DELEG_PERM_MOUNT, cr);

    return (error);
}

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);
}

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

    error = secpolicy_fs_unmount(cr, NULL);
    if (error) {
        error = dsl_deleg_access(zc->zc_name, 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);
}

/*
 * Just like zfs_secpolicy_config, except that we will check for
 * mount permission on the dataset for permission to create/remove
 * the minor nodes.
 */
static int
zfs_secpolicy_minor(zfs_cmd_t *zc, cred_t *cr)
{
    if (secpolicy_sys_config(cr, B_FALSE) != 0) {
        return (dsl_deleg_access(zc->zc_name,
            ZFS_DELEG_PERM_MOUNT, cr));
    }

    return (0);
}

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

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

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

    packed = kmem_alloc(size, KM_SLEEP);

    if ((error = xcopyin((void *)(uintptr_t)zc->zc_nvlist_src, packed,
        size)) != 0) {
        kmem_free(packed, size);
        return (error);
    }

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

    kmem_free(packed, size);

    *nvp = config;
    return (0);
}

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

    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);
        VERIFY(nvlist_pack(nvl, &packed, &size, NV_ENCODE_NATIVE,
            KM_SLEEP) == 0);
        error = xcopyout(packed, (void *)(uintptr_t)zc->zc_nvlist_dst,
            size);
        kmem_free(packed, size);
    }

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

static int
zfs_ioc_pool_create(zfs_cmd_t *zc)
{
    int error;
    nvlist_t *config;
    char *buf;

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

    if ((error = get_nvlist(zc, &config)) != 0) {
        history_str_free(buf);
        return (error);
    }

    error = spa_create(zc->zc_name, config, zc->zc_value[0] == '\0' ?
        NULL : zc->zc_value, buf);

    nvlist_free(config);
    history_str_free(buf);

    return (error);
}

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

static int
zfs_ioc_pool_import(zfs_cmd_t *zc)
{
    int error;
    nvlist_t *config;
    uint64_t guid;

    if ((error = get_nvlist(zc, &config)) != 0)
        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,
            zc->zc_value[0] == '\0' ? NULL : zc->zc_value);

    nvlist_free(config);

    return (error);
}

static int
zfs_ioc_pool_export(zfs_cmd_t *zc)
{
    int error;
    zfs_log_history(zc);
    error = spa_export(zc->zc_name, NULL);
    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, &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);
}

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

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

    spa_config_enter(spa, RW_READER, FTAG);
    error = spa_scrub(spa, zc->zc_cookie, B_FALSE);
    spa_config_exit(spa, FTAG);

    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);

    spa_upgrade(spa);
    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 = kmem_alloc(size, KM_SLEEP);
    if ((error = spa_history_get(spa, &zc->zc_history_offset,
        &zc->zc_history_len, hist_buf)) == 0) {
        error = xcopyout(hist_buf,
            (char *)(uintptr_t)zc->zc_history,
            zc->zc_history_len);
    }

    spa_close(spa, FTAG);
    kmem_free(hist_buf, size);
    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);
}

static int
zfs_ioc_obj_to_path(zfs_cmd_t *zc)
{
    objset_t *osp;
    int error;

    if ((error = dmu_objset_open(zc->zc_name, DMU_OST_ZFS,
        DS_MODE_NONE | DS_MODE_READONLY, &osp)) != 0)
        return (error);

    error = zfs_obj_to_path(osp, zc->zc_obj, zc->zc_value,
        sizeof (zc->zc_value));
    dmu_objset_close(osp);

    return (error);
}

static int
zfs_ioc_vdev_add(zfs_cmd_t *zc)
{
    spa_t *spa;
    int error;
    nvlist_t *config;

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

    /*
     * A root pool with concatenated devices is not supported.
     * Thus, can not add a device to a root pool with one device.
     */
    if (spa->spa_root_vdev->vdev_children == 1 && spa->spa_bootfs != 0) {
        spa_close(spa, FTAG);
        return (EDOM);
    }

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

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

    case VDEV_STATE_DEGRADED:
        error = vdev_degrade(spa, zc->zc_guid);
        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, &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, B_FALSE);

    spa_close(spa, FTAG);
    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_objset_stats(zfs_cmd_t *zc)
{
    objset_t *os = NULL;
    int error;
    nvlist_t *nv;

retry:
    error = dmu_objset_open(zc->zc_name, DMU_OST_ANY,
        DS_MODE_STANDARD | DS_MODE_READONLY, &os);
    if (error != 0) {
        /*
         * This is ugly: dmu_objset_open() can return EBUSY if
         * the objset is held exclusively. Fortunately this hold is
         * only for a short while, so we retry here.
         * This avoids user code having to handle EBUSY,
         * for example for a "zfs list".
         */
        if (error == EBUSY) {
            delay(1);
            goto retry;
        }
        return (error);
    }

    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: {zpl,zvol}_get_stats() will read the objset contents,
         * which we aren't supposed to do with a
         * DS_MODE_STANDARD open, because it could be
         * inconsistent.  So this is a bit of a workaround...
         */
        if (!zc->zc_objset_stats.dds_inconsistent) {
            if (dmu_objset_type(os) == DMU_OST_ZVOL)
                VERIFY(zvol_get_stats(os, nv) == 0);
            else if (dmu_objset_type(os) == DMU_OST_ZFS)
                (void) zfs_get_stats(os, nv);
        }
        error = put_nvlist(zc, nv);
        nvlist_free(nv);
    }

    spa_altroot(dmu_objset_spa(os), zc->zc_value, sizeof (zc->zc_value));

    dmu_objset_close(os);
    return (error);
}

static int
zfs_ioc_dataset_list_next(zfs_cmd_t *zc)
{
    objset_t *os;
    int error;
    char *p;

retry:
    error = dmu_objset_open(zc->zc_name, DMU_OST_ANY,
        DS_MODE_STANDARD | DS_MODE_READONLY, &os);
    if (error != 0) {
        /*
         * This is ugly: dmu_objset_open() can return EBUSY if
         * the objset is held exclusively. Fortunately this hold is
         * only for a short while, so we retry here.
         * This avoids user code having to handle EBUSY,
         * for example for a "zfs list".
         */
        if (error == EBUSY) {
            delay(1);
            goto retry;
        }
        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);

    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 && !INGLOBALZONE(curproc) &&
        !zone_dataset_visible(zc->zc_name, NULL));

    /*
     * If it's a hidden dataset (ie. with a '$' in its name), don't
     * try to get stats for it.  Userland will skip over it.
     */
    if (error == 0 && strchr(zc->zc_name, '$') == NULL)
        error = zfs_ioc_objset_stats(zc); /* fill in the stats */

    dmu_objset_close(os);
    return (error);
}

static int
zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
{
    objset_t *os;
    int error;

retry:
    error = dmu_objset_open(zc->zc_name, DMU_OST_ANY,
        DS_MODE_STANDARD | DS_MODE_READONLY, &os);
    if (error != 0) {
        /*
         * This is ugly: dmu_objset_open() can return EBUSY if
         * the objset is held exclusively. Fortunately this hold is
         * only for a short while, so we retry here.
         * This avoids user code having to handle EBUSY,
         * for example for a "zfs list".
         */
        if (error == EBUSY) {
            delay(1);
            goto retry;
        }
        if (error == ENOENT)
            error = ESRCH;
        return (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_close(os);
        return (ESRCH);
    }

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

    if (error == 0)
        error = zfs_ioc_objset_stats(zc); /* fill in the stats */

    dmu_objset_close(os);
    return (error);
}

static int
zfs_set_prop_nvlist(const char *name, nvlist_t *nvl)
{
    nvpair_t *elem;
    int error;
    uint64_t intval;
    char *strval;

    /*
     * First validate permission to set all of the properties
     */
    elem = NULL;
    while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
        const char *propname = nvpair_name(elem);
        zfs_prop_t prop = zfs_name_to_prop(propname);

        if (prop == ZFS_PROP_INVAL) {
            /*
             * If this is a user-defined property, it must be a
             * string, and there is no further validation to do.
             */
            if (!zfs_prop_user(propname) ||
                nvpair_type(elem) != DATA_TYPE_STRING)
                return (EINVAL);

            error = zfs_secpolicy_write_perms(name,
                ZFS_DELEG_PERM_USERPROP, CRED());
            if (error)
                return (error);
            continue;
        }

        if ((error = zfs_secpolicy_setprop(name, prop, CRED())) != 0)
            return (error);

        /*
         * 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(elem) == DATA_TYPE_UINT64 &&
                nvpair_value_uint64(elem, &intval) == 0 &&
                intval >= ZIO_COMPRESS_GZIP_1 &&
                intval <= ZIO_COMPRESS_GZIP_9) {
                spa_t *spa;

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

                    spa_close(spa, FTAG);
                }
            }
            break;

        case ZFS_PROP_COPIES:
        {
            spa_t *spa;

            if (spa_open(name, &spa, FTAG) == 0) {
                if (spa_version(spa) <
                    SPA_VERSION_DITTO_BLOCKS) {
                    spa_close(spa, FTAG);
                    return (ENOTSUP);
                }
                spa_close(spa, FTAG);
            }
            break;
        }
        }
    }

    elem = NULL;
    while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
        const char *propname = nvpair_name(elem);
        zfs_prop_t prop = zfs_name_to_prop(propname);

        if (prop == ZFS_PROP_INVAL) {
            VERIFY(nvpair_value_string(elem, &strval) == 0);
            error = dsl_prop_set(name, propname, 1,
                strlen(strval) + 1, strval);
            if (error == 0)
                continue;
            else
                return (error);
        }

        switch (prop) {
        case ZFS_PROP_QUOTA:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = dsl_dir_set_quota(name, intval)) != 0)
                return (error);
            break;

        case ZFS_PROP_RESERVATION:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = dsl_dir_set_reservation(name,
                intval)) != 0)
                return (error);
            break;

        case ZFS_PROP_VOLSIZE:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = zvol_set_volsize(name,
                ddi_driver_major(zfs_dip), intval)) != 0)
                return (error);
            break;

        case ZFS_PROP_VOLBLOCKSIZE:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = zvol_set_volblocksize(name, intval)) != 0)
                return (error);
            break;

        case ZFS_PROP_VERSION:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = zfs_set_version(name, intval)) != 0)
                return (error);
            break;

        default:
            if (nvpair_type(elem) == DATA_TYPE_STRING) {
                if (zfs_prop_get_type(prop) !=
                    PROP_TYPE_STRING)
                    return (EINVAL);
                VERIFY(nvpair_value_string(elem, &strval) == 0);
                if ((error = dsl_prop_set(name,
                    nvpair_name(elem), 1, strlen(strval) + 1,
                    strval)) != 0)
                    return (error);
            } else if (nvpair_type(elem) == DATA_TYPE_UINT64) {
                const char *unused;

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

                switch (zfs_prop_get_type(prop)) {
                case PROP_TYPE_NUMBER:
                    break;
                case PROP_TYPE_BOOLEAN:
                    if (intval > 1)
                        return (EINVAL);
                    break;
                case PROP_TYPE_STRING:
                    return (EINVAL);
                case PROP_TYPE_INDEX:
                    if (zfs_prop_index_to_string(prop,
                        intval, &unused) != 0)
                        return (EINVAL);
                    break;
                default:
                    cmn_err(CE_PANIC,
                        "unknown property type");
                    break;
                }

                if ((error = dsl_prop_set(name, propname,
                    8, 1, &intval)) != 0)
                    return (error);
            } else {
                return (EINVAL);
            }
            break;
        }
    }

    return (0);
}

static int
zfs_ioc_set_prop(zfs_cmd_t *zc)
{
    nvlist_t *nvl;
    int error;

    /*
     * If zc_value is set, then this is an attempt to inherit a value.
     * Otherwise, zc_nvlist refers to a list of properties to set.
     */
    if (zc->zc_value[0] != '\0') {
        zfs_prop_t prop = zfs_name_to_prop(zc->zc_value);

        if (prop == ZFS_PROP_INVAL) {
            if (!zfs_prop_user(zc->zc_value))
                return (EINVAL);
            error = zfs_secpolicy_write_perms(zc->zc_name,
                ZFS_DELEG_PERM_USERPROP, CRED());
        } else {
            if (!zfs_prop_inheritable(prop))
                return (EINVAL);
            error = zfs_secpolicy_setprop(zc->zc_name,
                prop, CRED());
        }
        if (error)
            return (error);

        return (dsl_prop_set(zc->zc_name, zc->zc_value, 0, 0, NULL));
    }

    if ((error = get_nvlist(zc, &nvl)) != 0)
        return (error);

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

    nvlist_free(nvl);
    return (error);
}

static int
zfs_ioc_pool_set_props(zfs_cmd_t *zc)
{
    nvlist_t *nvl;
    int error, reset_bootfs = 0;
    uint64_t objnum;
    uint64_t intval;
    zpool_prop_t prop;
    nvpair_t *elem;
    char *propname, *strval;
    spa_t *spa;
    vdev_t *rvdev;
    char *vdev_type;
    objset_t *os;

    if ((error = get_nvlist(zc, &nvl)) != 0)
        return (error);

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

    if (spa_version(spa) < SPA_VERSION_BOOTFS) {
        nvlist_free(nvl);
        spa_close(spa, FTAG);
        return (ENOTSUP);
    }

    elem = NULL;
    while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {

        propname = nvpair_name(elem);

        if ((prop = zpool_name_to_prop(propname)) ==
            ZFS_PROP_INVAL) {
            nvlist_free(nvl);
            spa_close(spa, FTAG);
            return (EINVAL);
        }

        switch (prop) {
        case ZPOOL_PROP_DELEGATION:
            VERIFY(nvpair_value_uint64(elem, &intval) == 0);
            if (intval > 1)
                error = EINVAL;
            break;
        case ZPOOL_PROP_BOOTFS:
            /*
             * A bootable filesystem can not be on a RAIDZ pool
             * nor a striped pool with more than 1 device.
             */
            rvdev = spa->spa_root_vdev;
            vdev_type =
                rvdev->vdev_child[0]->vdev_ops->vdev_op_type;
            if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 ||
                (strcmp(vdev_type, VDEV_TYPE_MIRROR) != 0 &&
                rvdev->vdev_children > 1)) {
                error = ENOTSUP;
                break;
            }

            reset_bootfs = 1;

            VERIFY(nvpair_value_string(elem, &strval) == 0);
            if (strval == NULL || strval[0] == '\0') {
                objnum = zpool_prop_default_numeric(
                    ZPOOL_PROP_BOOTFS);
                break;
            }

            if (error = dmu_objset_open(strval, DMU_OST_ZFS,
                DS_MODE_STANDARD | DS_MODE_READONLY, &os))
                break;
            objnum = dmu_objset_id(os);
            dmu_objset_close(os);
            break;
        }

        if (error)
            break;
    }
    if (error == 0) {
        if (reset_bootfs) {
            VERIFY(nvlist_remove(nvl,
                zpool_prop_to_name(ZPOOL_PROP_BOOTFS),
                DATA_TYPE_STRING) == 0);
            VERIFY(nvlist_add_uint64(nvl,
                zpool_prop_to_name(ZPOOL_PROP_BOOTFS),
                objnum) == 0);
        }
        error = spa_set_props(spa, nvl);
    }

    nvlist_free(nvl);
    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)
        return (error);

    error = spa_get_props(spa, &nvp);

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

    spa_close(spa, FTAG);

    if (nvp)
        nvlist_free(nvp);
    return (error);
}

static int
zfs_ioc_iscsi_perm_check(zfs_cmd_t *zc)
{
    nvlist_t *nvp;
    int error;
    uint32_t uid;
    uint32_t gid;
    uint32_t *groups;
    uint_t group_cnt;
    cred_t  *usercred;

    if ((error = get_nvlist(zc, &nvp)) != 0) {
        return (error);
    }

    if ((error = nvlist_lookup_uint32(nvp,
        ZFS_DELEG_PERM_UID, &uid)) != 0) {
        nvlist_free(nvp);
        return (EPERM);
    }

    if ((error = nvlist_lookup_uint32(nvp,
        ZFS_DELEG_PERM_GID, &gid)) != 0) {
        nvlist_free(nvp);
        return (EPERM);
    }

    if ((error = nvlist_lookup_uint32_array(nvp, ZFS_DELEG_PERM_GROUPS,
        &groups, &group_cnt)) != 0) {
        nvlist_free(nvp);
        return (EPERM);
    }
    usercred = cralloc();
    if ((crsetugid(usercred, uid, gid) != 0) ||
        (crsetgroups(usercred, group_cnt, (gid_t *)groups) != 0)) {
        nvlist_free(nvp);
        crfree(usercred);
        return (EPERM);
    }
    nvlist_free(nvp);
    error = dsl_deleg_access(zc->zc_name,
        zfs_prop_to_name(ZFS_PROP_SHAREISCSI), usercred);
    crfree(usercred);
    return (error);
}

static int
zfs_ioc_set_fsacl(zfs_cmd_t *zc)
{
    int error;
    nvlist_t *fsaclnv = NULL;

    if ((error = get_nvlist(zc, &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);
}

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);
}

static int
zfs_ioc_create_minor(zfs_cmd_t *zc)
{
    return (zvol_create_minor(zc->zc_name, ddi_driver_major(zfs_dip)));
}

static int
zfs_ioc_remove_minor(zfs_cmd_t *zc)
{
    return (zvol_remove_minor(zc->zc_name));
}

/*
 * Search the vfs list for a specified resource.  Returns a pointer to it
 * or NULL if no suitable entry is found. The caller of this routine
 * is responsible for releasing the returned vfs pointer.
 */
static vfs_t *
zfs_get_vfs(const char *resource)
{
    struct vfs *vfsp;
    struct vfs *vfs_found = NULL;

    vfs_list_read_lock();
    vfsp = rootvfs;
    do {
        if (strcmp(refstr_value(vfsp->vfs_resource), resource) == 0) {
            VFS_HOLD(vfsp);
            vfs_found = vfsp;
            break;
        }
        vfsp = vfsp->vfs_next;
    } while (vfsp != rootvfs);
    vfs_list_unlock();
    return (vfs_found);
}

/* ARGSUSED */
static void
zfs_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
{
    nvlist_t *nvprops = arg;
    uint64_t version = ZPL_VERSION;

    (void) nvlist_lookup_uint64(nvprops,
        zfs_prop_to_name(ZFS_PROP_VERSION), &version);

    zfs_create_fs(os, cr, version, tx);
}

static int
zfs_ioc_create(zfs_cmd_t *zc)
{
    objset_t *clone;
    int error = 0;
    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;
    }
    if (strchr(zc->zc_name, '@'))
        return (EINVAL);

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

    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_open(zc->zc_value, type,
            DS_MODE_STANDARD | DS_MODE_READONLY, &clone);
        if (error) {
            nvlist_free(nvprops);
            return (error);
        }
        error = dmu_objset_create(zc->zc_name, type, clone, NULL, NULL);
        dmu_objset_close(clone);
    } else {
        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) {
            uint64_t version;

            if (0 == nvlist_lookup_uint64(nvprops,
                zfs_prop_to_name(ZFS_PROP_VERSION), &version) &&
                (version < ZPL_VERSION_INITIAL ||
                version > ZPL_VERSION)) {
                nvlist_free(nvprops);
                return (EINVAL);
            }
        }

        error = dmu_objset_create(zc->zc_name, type, NULL, cbfunc,
            nvprops);
    }

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

    nvlist_free(nvprops);
    return (error);
}

static int
zfs_ioc_snapshot(zfs_cmd_t *zc)
{
    if (snapshot_namecheck(zc->zc_value, NULL, NULL) != 0)
        return (EINVAL);
    return (dmu_objset_snapshot(zc->zc_name,
        zc->zc_value, zc->zc_cookie));
}

int
zfs_unmount_snap(char *name, void *arg)
{
    char *snapname = arg;
    char *cp;
    vfs_t *vfsp = NULL;

    /*
     * Snapshots (which are under .zfs control) must be unmounted
     * before they can be destroyed.
     */

    if (snapname) {
        (void) strcat(name, "@");
        (void) strcat(name, snapname);
        vfsp = zfs_get_vfs(name);
        cp = strchr(name, '@');
        *cp = '\0';
    } else if (strchr(name, '@')) {
        vfsp = zfs_get_vfs(name);
    }

    if (vfsp) {
        /*
         * Always force the unmount for snapshots.
         */
        int flag = MS_FORCE;
        int err;

        if ((err = vn_vfswlock(vfsp->vfs_vnodecovered)) != 0) {
            VFS_RELE(vfsp);
            return (err);
        }
        VFS_RELE(vfsp);
        if ((err = dounmount(vfsp, flag, kcred)) != 0)
            return (err);
    }
    return (0);
}

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));
}

static int
zfs_ioc_destroy(zfs_cmd_t *zc)
{
    if (strchr(zc->zc_name, '@') && zc->zc_objset_type == DMU_OST_ZFS) {
        int err = zfs_unmount_snap(zc->zc_name, NULL);
        if (err)
            return (err);
    }

    return (dmu_objset_destroy(zc->zc_name));
}

static int
zfs_ioc_rollback(zfs_cmd_t *zc)
{
    return (dmu_objset_rollback(zc->zc_name));
}

static int
zfs_ioc_rename(zfs_cmd_t *zc)
{
    boolean_t recursive = zc->zc_cookie & 1;

    zc->zc_value[sizeof (zc->zc_value) - 1] = '\0';
    if (dataset_namecheck(zc->zc_value, NULL, NULL) != 0)
        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) {
        int err = zfs_unmount_snap(zc->zc_name, NULL);
        if (err)
            return (err);
    }

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

static int
zfs_ioc_recvbackup(zfs_cmd_t *zc)
{
    file_t *fp;
    int error, fd;
    offset_t new_off;

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

    fd = zc->zc_cookie;
    fp = getf(fd);
    if (fp == NULL)
        return (EBADF);
    error = dmu_recvbackup(zc->zc_value, &zc->zc_begin_record,
        &zc->zc_cookie, (boolean_t)zc->zc_guid, fp->f_vnode,
        fp->f_offset);

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

    releasef(fd);
    return (error);
}

static int
zfs_ioc_sendbackup(zfs_cmd_t *zc)
{
    objset_t *fromsnap = NULL;
    objset_t *tosnap;
    file_t *fp;
    int error;

    error = dmu_objset_open(zc->zc_name, DMU_OST_ANY,
        DS_MODE_STANDARD | DS_MODE_READONLY, &tosnap);
    if (error)
        return (error);

    if (zc->zc_value[0] != '\0') {
        char buf[MAXPATHLEN];
        char *cp;

        (void) strncpy(buf, zc->zc_name, sizeof (buf));
        cp = strchr(buf, '@');
        if (cp)
            *(cp+1) = 0;
        (void) strncat(buf, zc->zc_value, sizeof (buf));
        error = dmu_objset_open(buf, DMU_OST_ANY,
            DS_MODE_STANDARD | DS_MODE_READONLY, &fromsnap);
        if (error) {
            dmu_objset_close(tosnap);
            return (error);
        }
    }

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

    error = dmu_sendbackup(tosnap, fromsnap, fp->f_vnode);

    releasef(zc->zc_cookie);
    if (fromsnap)
        dmu_objset_close(fromsnap);
    dmu_objset_close(tosnap);
    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;
    uint64_t txg;

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

    txg = spa_vdev_enter(spa);

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

    vdev_clear(spa, vd);

    (void) spa_vdev_exit(spa, NULL, txg, 0);

    spa_close(spa, FTAG);

    return (0);
}

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));
}

/*
 * We don't want to have a hard dependency
 * against some special symbols in sharefs
 * and nfs.  Determine them if needed when
 * the first file system is shared.
 * Neither sharefs or nfs are unloadable modules.
 */
int (*zexport_fs)(void *arg);
int (*zshare_fs)(enum sharefs_sys_op, share_t *, uint32_t);

int zfs_share_inited;
ddi_modhandle_t nfs_mod;
ddi_modhandle_t sharefs_mod;
kmutex_t zfs_share_lock;

static int
zfs_ioc_share(zfs_cmd_t *zc)
{
    int error;
    int opcode;

    if (zfs_share_inited == 0) {
        mutex_enter(&zfs_share_lock);
        nfs_mod = ddi_modopen("fs/nfs", KRTLD_MODE_FIRST, &error);
        sharefs_mod = ddi_modopen("fs/sharefs",
            KRTLD_MODE_FIRST, &error);
        if (nfs_mod == NULL || sharefs_mod == NULL) {
            mutex_exit(&zfs_share_lock);
            return (ENOSYS);
        }
        if (zexport_fs == NULL && ((zexport_fs = (int (*)(void *))
            ddi_modsym(nfs_mod, "nfs_export", &error)) == NULL)) {
            mutex_exit(&zfs_share_lock);
            return (ENOSYS);
        }

        if (zshare_fs == NULL && ((zshare_fs =
            (int (*)(enum sharefs_sys_op, share_t *, uint32_t))
            ddi_modsym(sharefs_mod, "sharefs_impl", &error)) == NULL)) {
            mutex_exit(&zfs_share_lock);
            return (ENOSYS);
        }
        zfs_share_inited = 1;
        mutex_exit(&zfs_share_lock);
    }

    if (error = zexport_fs((void *)(uintptr_t)zc->zc_share.z_exportdata))
        return (error);

    opcode = (zc->zc_share.z_sharetype == B_TRUE) ?
        SHAREFS_ADD : SHAREFS_REMOVE;

    error = zshare_fs(opcode,
        (void *)(uintptr_t)zc->zc_share.z_sharedata,
        zc->zc_share.z_sharemax);

    return (error);

}

/*
 * pool destroy and pool export don't log the history as part of zfsdev_ioctl,
 * but rather zfs_ioc_pool_create, and zfs_ioc_pool_export do the loggin
 * of those commands.
 */
static zfs_ioc_vec_t zfs_ioc_vec[] = {
    { zfs_ioc_pool_create, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_pool_destroy, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_pool_import, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_pool_export, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_pool_configs, zfs_secpolicy_none, NO_NAME, B_FALSE },
    { zfs_ioc_pool_stats, zfs_secpolicy_read, POOL_NAME, B_FALSE },
    { zfs_ioc_pool_tryimport, zfs_secpolicy_config, NO_NAME, B_FALSE },
    { zfs_ioc_pool_scrub, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_pool_freeze, zfs_secpolicy_config, NO_NAME, B_FALSE },
    { zfs_ioc_pool_upgrade, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_pool_get_history, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_vdev_add, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_vdev_remove, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_vdev_set_state, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_vdev_attach, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_vdev_detach, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_vdev_setpath, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_objset_stats, zfs_secpolicy_read, DATASET_NAME, B_FALSE },
    { zfs_ioc_dataset_list_next, zfs_secpolicy_read,
        DATASET_NAME, B_FALSE },
    { zfs_ioc_snapshot_list_next, zfs_secpolicy_read,
        DATASET_NAME, B_FALSE },
    { zfs_ioc_set_prop, zfs_secpolicy_none, DATASET_NAME, B_TRUE },
    { zfs_ioc_create_minor, zfs_secpolicy_minor, DATASET_NAME, B_FALSE },
    { zfs_ioc_remove_minor, zfs_secpolicy_minor, DATASET_NAME, B_FALSE },
    { zfs_ioc_create, zfs_secpolicy_create, DATASET_NAME, B_TRUE },
    { zfs_ioc_destroy, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE },
    { zfs_ioc_rollback, zfs_secpolicy_rollback, DATASET_NAME, B_TRUE },
    { zfs_ioc_rename, zfs_secpolicy_rename, DATASET_NAME, B_TRUE },
    { zfs_ioc_recvbackup, zfs_secpolicy_receive, DATASET_NAME, B_TRUE },
    { zfs_ioc_sendbackup, zfs_secpolicy_send, DATASET_NAME, B_TRUE },
    { zfs_ioc_inject_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE },
    { zfs_ioc_clear_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE },
    { zfs_ioc_inject_list_next, zfs_secpolicy_inject, NO_NAME, B_FALSE },
    { zfs_ioc_error_log, zfs_secpolicy_inject, POOL_NAME, B_FALSE },
    { zfs_ioc_clear, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_promote, zfs_secpolicy_promote, DATASET_NAME, B_TRUE },
    { zfs_ioc_destroy_snaps, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE },
    { zfs_ioc_snapshot, zfs_secpolicy_snapshot, DATASET_NAME, B_TRUE },
    { zfs_ioc_dsobj_to_dsname, zfs_secpolicy_config, POOL_NAME, B_FALSE },
    { zfs_ioc_obj_to_path, zfs_secpolicy_config, NO_NAME, B_FALSE },
    { zfs_ioc_pool_set_props, zfs_secpolicy_config, POOL_NAME, B_TRUE },
    { zfs_ioc_pool_get_props, zfs_secpolicy_read, POOL_NAME, B_FALSE },
    { zfs_ioc_set_fsacl, zfs_secpolicy_fsacl, DATASET_NAME, B_TRUE },
    { zfs_ioc_get_fsacl, zfs_secpolicy_read, DATASET_NAME, B_FALSE },
    { zfs_ioc_iscsi_perm_check, zfs_secpolicy_iscsi,
        DATASET_NAME, B_FALSE },
    { zfs_ioc_share, zfs_secpolicy_share, DATASET_NAME, B_FALSE }
};

static int
zfsdev_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
{
    zfs_cmd_t *zc;
    uint_t vec;
    int error, rc;

    if (getminor(dev) != 0)
        return (zvol_ioctl(dev, cmd, arg, flag, cr, rvalp));

    vec = cmd - ZFS_IOC;
    ASSERT3U(getmajor(dev), ==, ddi_driver_major(zfs_dip));

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

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

    error = xcopyin((void *)arg, zc, sizeof (zfs_cmd_t));

    if (error == 0)
        error = zfs_ioc_vec[vec].zvec_secpolicy(zc, cr);

    /*
     * 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';
        switch (zfs_ioc_vec[vec].zvec_namecheck) {
        case POOL_NAME:
            if (pool_namecheck(zc->zc_name, NULL, NULL) != 0)
                error = EINVAL;
            break;

        case DATASET_NAME:
            if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0)
                error = EINVAL;
            break;

        case NO_NAME:
            break;
        }
    }

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

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

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

static int
zfs_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    if (cmd != DDI_ATTACH)
        return (DDI_FAILURE);

    if (ddi_create_minor_node(dip, "zfs", S_IFCHR, 0,
        DDI_PSEUDO, 0) == DDI_FAILURE)
        return (DDI_FAILURE);

    zfs_dip = dip;

    ddi_report_dev(dip);

    return (DDI_SUCCESS);
}

static int
zfs_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    if (spa_busy() || zfs_busy() || zvol_busy())
        return (DDI_FAILURE);

    if (cmd != DDI_DETACH)
        return (DDI_FAILURE);

    zfs_dip = NULL;

    ddi_prop_remove_all(dip);
    ddi_remove_minor_node(dip, NULL);

    return (DDI_SUCCESS);
}

/*ARGSUSED*/
static int
zfs_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
    switch (infocmd) {
    case DDI_INFO_DEVT2DEVINFO:
        *result = zfs_dip;
        return (DDI_SUCCESS);

    case DDI_INFO_DEVT2INSTANCE:
        *result = (void *)0;
        return (DDI_SUCCESS);
    }

    return (DDI_FAILURE);
}

/*
 * OK, so this is a little weird.
 *
 * /dev/zfs is the control node, i.e. minor 0.
 * /dev/zvol/[r]dsk/pool/dataset are the zvols, minor > 0.
 *
 * /dev/zfs has basically nothing to do except serve up ioctls,
 * so most of the standard driver entry points are in zvol.c.
 */
static struct cb_ops zfs_cb_ops = {
    zvol_open,  /* open */
    zvol_close, /* close */
    zvol_strategy,  /* strategy */
    nodev,      /* print */
    nodev,      /* dump */
    zvol_read,  /* read */
    zvol_write, /* write */
    zfsdev_ioctl,   /* ioctl */
    nodev,      /* devmap */
    nodev,      /* mmap */
    nodev,      /* segmap */
    nochpoll,   /* poll */
    ddi_prop_op,    /* prop_op */
    NULL,       /* streamtab */
    D_NEW | D_MP | D_64BIT,     /* Driver compatibility flag */
    CB_REV,     /* version */
    nodev,      /* async read */
    nodev,      /* async write */
};

static struct dev_ops zfs_dev_ops = {
    DEVO_REV,   /* version */
    0,      /* refcnt */
    zfs_info,   /* info */
    nulldev,    /* identify */
    nulldev,    /* probe */
    zfs_attach, /* attach */
    zfs_detach, /* detach */
    nodev,      /* reset */
    &zfs_cb_ops,    /* driver operations */
    NULL        /* no bus operations */
};

static struct modldrv zfs_modldrv = {
    &mod_driverops, "ZFS storage pool version " SPA_VERSION_STRING,
        &zfs_dev_ops
};

static struct modlinkage modlinkage = {
    MODREV_1,
    (void *)&zfs_modlfs,
    (void *)&zfs_modldrv,
    NULL
};


uint_t zfs_fsyncer_key;

int
_init(void)
{
    int error;

    spa_init(FREAD | FWRITE);
    zfs_init();
    zvol_init();

    if ((error = mod_install(&modlinkage)) != 0) {
        zvol_fini();
        zfs_fini();
        spa_fini();
        return (error);
    }

    tsd_create(&zfs_fsyncer_key, NULL);

    error = ldi_ident_from_mod(&modlinkage, &zfs_li);
    ASSERT(error == 0);
    mutex_init(&zfs_share_lock, NULL, MUTEX_DEFAULT, NULL);

    return (0);
}

int
_fini(void)
{
    int error;

    if (spa_busy() || zfs_busy() || zvol_busy() || zio_injection_enabled)
        return (EBUSY);

    if ((error = mod_remove(&modlinkage)) != 0)
        return (error);

    zvol_fini();
    zfs_fini();
    spa_fini();
    if (zfs_share_inited) {
        (void) ddi_modclose(nfs_mod);
        (void) ddi_modclose(sharefs_mod);
    }

    tsd_destroy(&zfs_fsyncer_key);
    ldi_ident_release(zfs_li);
    zfs_li = NULL;
    mutex_destroy(&zfs_share_lock);

    return (error);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}