fs/zfs/zfs_ioctl.c

	zfs_ioctl.c revision 681d9761e8516a7dc5ab6589e2dfe717777e1123
/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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_znode.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/zfs_dir.h>
#include <sys/zvol.h>
#include <sharefs/share.h>
#include <sys/dmu_objset.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 enum {
    NO_NAME,
    POOL_NAME,
    DATASET_NAME
} zfs_ioc_namecheck_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;
    boolean_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 void clear_props(char *dataset, nvlist_t *props, nvlist_t *newprops);
static int zfs_fill_zplprops_root(uint64_t, nvlist_t *, nvlist_t *,
    boolean_t *);
int zfs_set_prop_nvlist(const char *, nvlist_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);
}

/*
 * 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) == dmu_objset_spa(os)->spa_bootfs);
        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(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)
{
    return (zfs_secpolicy_write_perms(zc->zc_name,
        ZFS_DELEG_PERM_ROLLBACK, cr));
}

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

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));
}

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

    if (secpolicy_nfs(cr) == 0) {
        return (0);
    } else {
        return (zfs_secpolicy_deleg_share(zc, cr));
    }
}

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

    if (secpolicy_smb(cr) == 0) {
        return (0);
    } else {
        return (zfs_secpolicy_deleg_share(zc, 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_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);
}

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);
}

/*
 * 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 {
        if (!zfs_prop_inheritable(prop))
            return (EINVAL);
        return (zfs_secpolicy_setprop(zc->zc_name, prop, 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, 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));
}

/*
 * 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);

    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
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 = ddi_copyout(packed,
            (void *)(uintptr_t)zc->zc_nvlist_dst, size, zc->zc_iflags);
        kmem_free(packed, size);
    }

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

static int
getzfsvfs(const char *dsname, zfsvfs_t **zvp)
{
    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);
    *zvp = dmu_objset_get_user(os);
    if (*zvp) {
        VFS_HOLD((*zvp)->z_vfs);
    } else {
        error = ESRCH;
    }
    mutex_exit(&os->os_user_ptr_lock);
    dmu_objset_rele(os, FTAG);
    return (error);
}

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

    if (getzfsvfs(name, zvp) != 0)
        error = zfsvfs_create(name, zvp);
    if (error == 0) {
        rrw_enter(&(*zvp)->z_teardown_lock, RW_READER, tag);
        if ((*zvp)->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(&(*zvp)->z_teardown_lock, tag);
            return (EBUSY);
        }
    }
    return (error);
}

static void
zfsvfs_rele(zfsvfs_t *zfsvfs, void *tag)
{
    rrw_exit(&zfsvfs->z_teardown_lock, tag);

    if (zfsvfs->z_vfs) {
        VFS_RELE(zfsvfs->z_vfs);
    } else {
        dmu_objset_disown(zfsvfs->z_os, zfsvfs);
        zfsvfs_free(zfsvfs);
    }
}

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, rootprops)) != 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)
{
    int error;
    nvlist_t *config, *props = NULL;
    uint64_t guid;

    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 if (zc->zc_cookie)
        error = spa_import_verbatim(zc->zc_name, config,
            props);
    else
        error = spa_import(zc->zc_name, config, props);

    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);
}

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);

    error = spa_scrub(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 = kmem_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);
    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);
}

/*
 * 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);
}

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->spa_bootfs != 0 && nl2cache == 0 && nspares == 0) {
        spa_close(spa, FTAG);
        return (EDOM);
    }

    if (error == 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)
{
    boolean_t nslock;
    spa_t *spa;
    int error;
    vdev_state_t newstate = VDEV_STATE_UNKNOWN;

    if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
        return (error);
    nslock = spa_uses_zvols(spa);
    if (nslock)
        mutex_enter(&spa_namespace_lock);
    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;
    }
    if (nslock)
        mutex_exit(&spa_namespace_lock);
    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_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);
}

/*
 * 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;
    nvlist_t *nv;

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

    dmu_objset_fast_stat(os, &zc->zc_objset_stats);

    if (zc->zc_nvlist_dst != 0 &&
        (error = dsl_prop_get_all(os, &nv, FALSE)) == 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)
                VERIFY(zvol_get_stats(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 != NULL &&
        !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;

    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)
            (void) dmu_objset_prefetch(p, 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 */
    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;

    if (zc->zc_cookie == 0)
        (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), NULL, &zc->zc_cookie, NULL);
    dmu_objset_rele(os, FTAG);
    if (error == 0)
        error = zfs_ioc_objset_stats(zc); /* fill in the stats */
    else if (error == ENOENT)
        error = ESRCH;

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

int
zfs_set_prop_nvlist(const char *name, nvlist_t *nvl)
{
    nvpair_t *elem;
    int error = 0;
    uint64_t intval;
    char *strval;
    nvlist_t *genericnvl;
    boolean_t issnap = (strchr(name, '@') != NULL);

    /*
     * 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 == ZPROP_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) {
                if (error = zfs_secpolicy_write_perms(name,
                    ZFS_DELEG_PERM_USERPROP, CRED()))
                    return (error);
                continue;
            }

            if (!issnap && zfs_prop_userquota(propname) &&
                nvpair_type(elem) == DATA_TYPE_UINT64_ARRAY) {
                const char *perm;
                const char *up = zfs_userquota_prop_prefixes
                    [ZFS_PROP_USERQUOTA];
                if (strncmp(propname, up, strlen(up)) == 0)
                    perm = ZFS_DELEG_PERM_USERQUOTA;
                else
                    perm = ZFS_DELEG_PERM_GROUPQUOTA;
                if (error = zfs_secpolicy_write_perms(name,
                    perm, CRED()))
                    return (error);
                continue;
            }

            return (EINVAL);
        }

        if (issnap)
            return (EINVAL);

        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) {
                if (intval >= ZIO_COMPRESS_GZIP_1 &&
                    intval <= ZIO_COMPRESS_GZIP_9 &&
                    zfs_earlier_version(name,
                    SPA_VERSION_GZIP_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(name) &&
                    !BOOTFS_COMPRESS_VALID(intval))
                    return (ERANGE);
            }
            break;

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

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

        case ZFS_PROP_ACLINHERIT:
            if (nvpair_type(elem) == DATA_TYPE_UINT64 &&
                nvpair_value_uint64(elem, &intval) == 0)
                if (intval == ZFS_ACL_PASSTHROUGH_X &&
                    zfs_earlier_version(name,
                    SPA_VERSION_PASSTHROUGH_X))
                    return (ENOTSUP);
        }
    }

    VERIFY(nvlist_alloc(&genericnvl, NV_UNIQUE_NAME, KM_SLEEP) == 0);
    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 == ZPROP_INVAL) {
            if (zfs_prop_userquota(propname)) {
                uint64_t *valary;
                unsigned int vallen;
                const char *domain;
                zfs_userquota_prop_t type;
                uint64_t rid;
                uint64_t quota;
                zfsvfs_t *zfsvfs;

                VERIFY(nvpair_value_uint64_array(elem,
                    &valary, &vallen) == 0);
                VERIFY(vallen == 3);
                type = valary[0];
                rid = valary[1];
                quota = valary[2];
                domain = propname +
                    strlen(zfs_userquota_prop_prefixes[type]);

                error = zfsvfs_hold(name, FTAG, &zfsvfs);
                if (error == 0) {
                    error = zfs_set_userquota(zfsvfs,
                        type, domain, rid, quota);
                    zfsvfs_rele(zfsvfs, FTAG);
                }
                if (error == 0)
                    continue;
                else
                    goto out;
            } else if (zfs_prop_user(propname)) {
                VERIFY(nvpair_value_string(elem, &strval) == 0);
                error = dsl_prop_set(name, propname, 1,
                    strlen(strval) + 1, strval);
                if (error == 0)
                    continue;
                else
                    goto out;
            }
        }

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

        case ZFS_PROP_REFQUOTA:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = dsl_dataset_set_quota(name, intval)) != 0)
                goto out;
            break;

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

        case ZFS_PROP_REFRESERVATION:
            if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
                (error = dsl_dataset_set_reservation(name,
                intval)) != 0)
                goto out;
            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)
                goto out;
            break;

        case ZFS_PROP_VERSION:
        {
            zfsvfs_t *zfsvfs;

            if ((error = nvpair_value_uint64(elem, &intval)) != 0)
                goto out;
            if ((error = zfsvfs_hold(name, FTAG, &zfsvfs)) != 0)
                goto out;
            error = zfs_set_version(zfsvfs, intval);
            zfsvfs_rele(zfsvfs, FTAG);

            if (error == 0 && intval >= ZPL_VERSION_USERSPACE) {
                zfs_cmd_t zc = { 0 };
                (void) strcpy(zc.zc_name, name);
                (void) zfs_ioc_userspace_upgrade(&zc);
            }
            if (error)
                goto out;
            break;
        }

        default:
            if (nvpair_type(elem) == DATA_TYPE_STRING) {
                if (zfs_prop_get_type(prop) !=
                    PROP_TYPE_STRING) {
                    error = EINVAL;
                    goto out;
                }
            } 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_STRING:
                    error = EINVAL;
                    goto out;
                case PROP_TYPE_INDEX:
                    if (zfs_prop_index_to_string(prop,
                        intval, &unused) != 0) {
                        error = EINVAL;
                        goto out;
                    }
                    break;
                default:
                    cmn_err(CE_PANIC,
                        "unknown property type");
                    break;
                }
            } else {
                error = EINVAL;
                goto out;
            }
            if ((error = nvlist_add_nvpair(genericnvl, elem)) != 0)
                goto out;
        }
    }

    if (nvlist_next_nvpair(genericnvl, NULL) != NULL) {
        error = dsl_props_set(name, genericnvl);
    }
out:
    nvlist_free(genericnvl);
    return (error);
}

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

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

        if (!zfs_prop_user(propname) ||
            nvpair_type(elem) != 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(elem, &valstr) == 0);
        if (strlen(valstr) >= ZAP_MAXVALUELEN)
            return (E2BIG);
    }
    return (0);
}

/*
 * inputs:
 * zc_name      name of filesystem
 * zc_value     name of property to set
 * zc_nvlist_src{_size} nvlist of properties to apply
 * zc_cookie        clear existing local props?
 *
 * outputs:     none
 */
static int
zfs_ioc_set_prop(zfs_cmd_t *zc)
{
    nvlist_t *nvl;
    int error;

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

    if (zc->zc_cookie) {
        nvlist_t *origprops;
        objset_t *os;

        if (dmu_objset_hold(zc->zc_name, FTAG, &os) == 0) {
            if (dsl_prop_get_all(os, &origprops, TRUE) == 0) {
                clear_props(zc->zc_name, origprops, nvl);
                nvlist_free(origprops);
            }
            dmu_objset_rele(os, FTAG);
        }

    }

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

    nvlist_free(nvl);
    return (error);
}

/*
 * inputs:
 * zc_name      name of filesystem
 * zc_value     name of property to inherit
 *
 * outputs:     none
 */
static int
zfs_ioc_inherit_prop(zfs_cmd_t *zc)
{
    /* the property name has been validated by zfs_secpolicy_inherit() */
    return (dsl_prop_set(zc->zc_name, zc->zc_value, 0, 0, NULL));
}

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

    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.
     */
    elem = nvlist_next_nvpair(props, NULL);
    if (elem != NULL && strcmp(nvpair_name(elem),
        zpool_prop_to_name(ZPOOL_PROP_CACHEFILE)) == 0 &&
        nvlist_next_nvpair(props, elem) == 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)
            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 != NULL)
        error = put_nvlist(zc, nvp);
    else
        error = EFAULT;

    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->zc_nvlist_src, zc->zc_nvlist_src_size,
        zc->zc_iflags, &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);
}

/*
 * 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);
}

/*
 * 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)
{
    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, 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;

    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_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)
        VERIFY(zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &norm) == 0);
    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)
        VERIFY(zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &u8) == 0);
    VERIFY(nvlist_add_uint64(zplprops,
        zfs_prop_to_name(ZFS_PROP_UTF8ONLY), u8) == 0);

    if (sense == ZFS_PROP_UNDEFINED)
        VERIFY(zfs_get_zplprop(os, ZFS_PROP_CASE, &sense) == 0);
    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 = B_TRUE;
    uint64_t zplver = ZPL_VERSION;
    objset_t *os = NULL;
    char parentname[MAXNAMELEN];
    char *cp;
    int error;

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

    if (zfs_earlier_version(dataset, SPA_VERSION_USERSPACE))
        zplver = ZPL_VERSION_USERSPACE - 1;
    if (zfs_earlier_version(dataset, SPA_VERSION_FUID)) {
        zplver = ZPL_VERSION_FUID - 1;
        fuids_ok = B_FALSE;
    }

    /*
     * 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, 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 = B_TRUE;
    uint64_t zplver = ZPL_VERSION;
    int error;

    if (spa_vers < SPA_VERSION_FUID) {
        zplver = ZPL_VERSION_FUID - 1;
        fuids_ok = B_FALSE;
    }

    error = zfs_fill_zplprops_impl(NULL, zplver, fuids_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 != NULL &&
        (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) {
        if ((error = zfs_set_prop_nvlist(zc->zc_name, nvprops)) != 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 != NULL &&
        (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 (nvprops != NULL && nvlist_next_nvpair(nvprops, NULL) != NULL &&
        zfs_earlier_version(zc->zc_name, SPA_VERSION_SNAP_PROPS)) {
        error = ENOTSUP;
        goto out;
    }

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

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

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

    if (arg) {
        char *snapname = arg;
        int len = strlen(name) + strlen(snapname) + 2;
        char *buf = kmem_alloc(len, KM_SLEEP);

        (void) strcpy(buf, name);
        (void) strcat(buf, "@");
        (void) strcat(buf, snapname);
        vfsp = zfs_get_vfs(buf);
        kmem_free(buf, len);
    } 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);
}

/*
 * 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)
        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;
    zfsvfs_t *zfsvfs;
    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 (getzfsvfs(zc->zc_name, &zfsvfs) == 0) {
        error = zfs_suspend_fs(zfsvfs);
        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(zfsvfs, zc->zc_name);
            error = error ? error : resume_err;
        }
        VFS_RELE(zfsvfs->z_vfs);
    } 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;

    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) {
        int err = zfs_unmount_snap(zc->zc_name, NULL);
        if (err)
            return (err);
    }
    if (zc->zc_objset_type == DMU_OST_ZVOL)
        (void) zvol_remove_minor(zc->zc_name);
    return (dmu_objset_rename(zc->zc_name, zc->zc_value, recursive));
}

static void
clear_props(char *dataset, nvlist_t *props, nvlist_t *newprops)
{
    zfs_cmd_t *zc;
    nvpair_t *prop;

    if (props == NULL)
        return;
    zc = kmem_alloc(sizeof (zfs_cmd_t), KM_SLEEP);
    (void) strcpy(zc->zc_name, dataset);
    for (prop = nvlist_next_nvpair(props, NULL); prop;
        prop = nvlist_next_nvpair(props, prop)) {
        if (newprops != NULL &&
            nvlist_exists(newprops, nvpair_name(prop)))
            continue;
        (void) strcpy(zc->zc_value, nvpair_name(prop));
        if (zfs_secpolicy_inherit(zc, CRED()) == 0)
            (void) zfs_ioc_inherit_prop(zc);
    }
    kmem_free(zc, sizeof (zfs_cmd_t));
}

/*
 * 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
 *
 * outputs:
 * zc_cookie        number of bytes read
 */
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 error, fd;
    offset_t off;
    nvlist_t *props = NULL;
    nvlist_t *origprops = NULL;
    objset_t *origin = NULL;
    char *tosnap;
    char tofs[ZFS_MAXNAMELEN];

    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';
    tosnap++;

    if (zc->zc_nvlist_src != NULL &&
        (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);
    }

    if (props && dmu_objset_hold(tofs, FTAG, &os) == 0) {
        /*
         * If new properties are supplied, they are to completely
         * replace the existing ones, so stash away the existing ones.
         */
        (void) dsl_prop_get_all(os, &origprops, B_TRUE);

        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_begin_record,
        force, origin, &drc);
    if (origin)
        dmu_objset_rele(origin, FTAG);
    if (error)
        goto out;

    /*
     * Reset properties.  We do this before we receive the stream
     * so that the properties are applied to the new data.
     */
    if (props) {
        clear_props(tofs, origprops, props);
        /*
         * XXX - Note, this is all-or-nothing; should be best-effort.
         */
        (void) zfs_set_prop_nvlist(tofs, props);
    }

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

    if (error == 0) {
        zfsvfs_t *zfsvfs = NULL;

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

            error = zfs_suspend_fs(zfsvfs);
            /*
             * 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) {
                int resume_err =
                    zfs_resume_fs(zfsvfs, tofs);
                error = error ? error : resume_err;
            }
            error = error ? error : end_err;
            VFS_RELE(zfsvfs->z_vfs);
        } 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;

    /*
     * On error, restore the original props.
     */
    if (error && props) {
        clear_props(tofs, props, NULL);
        (void) zfs_set_prop_nvlist(tofs, origprops);
    }
out:
    nvlist_free(props);
    nvlist_free(origprops);
    releasef(fd);
    return (error);
}

/*
 * inputs:
 * zc_name  name of snapshot to send
 * zc_value short name of incremental fromsnap (may be empty)
 * zc_cookie    file descriptor to send stream to
 * zc_obj   fromorigin flag (mutually exclusive with zc_value)
 *
 * 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;

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

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

        buf = kmem_alloc(MAXPATHLEN, KM_SLEEP);
        (void) strncpy(buf, zc->zc_name, MAXPATHLEN);
        cp = strchr(buf, '@');
        if (cp)
            *(cp+1) = 0;
        (void) strncat(buf, zc->zc_value, MAXPATHLEN);
        error = dmu_objset_hold(buf, FTAG, &fromsnap);
        kmem_free(buf, MAXPATHLEN);
        if (error) {
            dmu_objset_rele(tosnap, FTAG);
            return (error);
        }
    }

    fp = getf(zc->zc_cookie);
    if (fp == NULL) {
        dmu_objset_rele(tosnap, FTAG);
        if (fromsnap)
            dmu_objset_rele(fromsnap, 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 (fromsnap)
        dmu_objset_rele(fromsnap, FTAG);
    dmu_objset_rele(tosnap, 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->spa_log_state == SPA_LOG_MISSING) {
        /* we need to let spa_open/spa_load clear the chains */
        spa->spa_log_state = SPA_LOG_CLEAR;
    }
    mutex_exit(&spa_namespace_lock);

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

    spa_vdev_state_enter(spa);

    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)
{
    zfsvfs_t *zfsvfs;
    int error;

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

    error = zfsvfs_hold(zc->zc_name, FTAG, &zfsvfs);
    if (error)
        return (error);

    error = zfs_userspace_one(zfsvfs,
        zc->zc_objset_type, zc->zc_value, zc->zc_guid, &zc->zc_cookie);
    zfsvfs_rele(zfsvfs, 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)
{
    zfsvfs_t *zfsvfs;
    int error;

    error = zfsvfs_hold(zc->zc_name, FTAG, &zfsvfs);
    if (error)
        return (error);

    int bufsize = zc->zc_nvlist_dst_size;
    void *buf = kmem_alloc(bufsize, KM_SLEEP);

    error = zfs_userspace_many(zfsvfs, 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);
    }
    kmem_free(buf, bufsize);
    zfsvfs_rele(zfsvfs, 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;
    zfsvfs_t *zfsvfs;

    if (getzfsvfs(zc->zc_name, &zfsvfs) == 0) {
        if (!dmu_objset_userused_enabled(zfsvfs->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(zfsvfs);
            if (error == 0)
                error = zfs_resume_fs(zfsvfs, zc->zc_name);
        }
        if (error == 0)
            error = dmu_objset_userspace_upgrade(zfsvfs->z_os);
        VFS_RELE(zfsvfs->z_vfs);
    } 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);
}

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

int zfs_nfsshare_inited;
int zfs_smbshare_inited;

ddi_modhandle_t nfs_mod;
ddi_modhandle_t sharefs_mod;
ddi_modhandle_t smbsrv_mod;
kmutex_t zfs_share_lock;

static int
zfs_init_sharefs()
{
    int error;

    ASSERT(MUTEX_HELD(&zfs_share_lock));
    /* Both NFS and SMB shares also require sharetab support. */
    if (sharefs_mod == NULL && ((sharefs_mod =
        ddi_modopen("fs/sharefs",
        KRTLD_MODE_FIRST, &error)) == NULL)) {
        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)) {
        return (ENOSYS);
    }
    return (0);
}

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

    switch (zc->zc_share.z_sharetype) {
    case ZFS_SHARE_NFS:
    case ZFS_UNSHARE_NFS:
        if (zfs_nfsshare_inited == 0) {
            mutex_enter(&zfs_share_lock);
            if (nfs_mod == NULL && ((nfs_mod = ddi_modopen("fs/nfs",
                KRTLD_MODE_FIRST, &error)) == NULL)) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            if (znfsexport_fs == NULL &&
                ((znfsexport_fs = (int (*)(void *))
                ddi_modsym(nfs_mod,
                "nfs_export", &error)) == NULL)) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            error = zfs_init_sharefs();
            if (error) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            zfs_nfsshare_inited = 1;
            mutex_exit(&zfs_share_lock);
        }
        break;
    case ZFS_SHARE_SMB:
    case ZFS_UNSHARE_SMB:
        if (zfs_smbshare_inited == 0) {
            mutex_enter(&zfs_share_lock);
            if (smbsrv_mod == NULL && ((smbsrv_mod =
                ddi_modopen("drv/smbsrv",
                KRTLD_MODE_FIRST, &error)) == NULL)) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            if (zsmbexport_fs == NULL && ((zsmbexport_fs =
                (int (*)(void *, boolean_t))ddi_modsym(smbsrv_mod,
                "smb_server_share", &error)) == NULL)) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            error = zfs_init_sharefs();
            if (error) {
                mutex_exit(&zfs_share_lock);
                return (ENOSYS);
            }
            zfs_smbshare_inited = 1;
            mutex_exit(&zfs_share_lock);
        }
        break;
    default:
        return (EINVAL);
    }

    switch (zc->zc_share.z_sharetype) {
    case ZFS_SHARE_NFS:
    case ZFS_UNSHARE_NFS:
        if (error =
            znfsexport_fs((void *)
            (uintptr_t)zc->zc_share.z_exportdata))
            return (error);
        break;
    case ZFS_SHARE_SMB:
    case ZFS_UNSHARE_SMB:
        if (error = zsmbexport_fs((void *)
            (uintptr_t)zc->zc_share.z_exportdata,
            zc->zc_share.z_sharetype == ZFS_SHARE_SMB ?
            B_TRUE: B_FALSE)) {
            return (error);
        }
        break;
    }

    opcode = (zc->zc_share.z_sharetype == ZFS_SHARE_NFS ||
        zc->zc_share.z_sharetype == ZFS_SHARE_SMB) ?
        SHAREFS_ADD : SHAREFS_REMOVE;

    /*
     * Add or remove share from sharetab
     */
    error = zshare_fs(opcode,
        (void *)(uintptr_t)zc->zc_share.z_sharedata,
        zc->zc_share.z_sharemax);

    return (error);

}

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

/*
 * Remove all ACL files in shares dir
 */
static int
zfs_smb_acl_purge(znode_t *dzp)
{
    zap_cursor_t    zc;
    zap_attribute_t zap;
    zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
    int error;

    for (zap_cursor_init(&zc, zfsvfs->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);
}

static int
zfs_ioc_smb_acl(zfs_cmd_t *zc)
{
    vnode_t *vp;
    znode_t *dzp;
    vnode_t *resourcevp = NULL;
    znode_t *sharedir;
    zfsvfs_t *zfsvfs;
    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);
    zfsvfs = dzp->z_zfsvfs;
    ZFS_ENTER(zfsvfs);

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

        tx = dmu_tx_create(zfsvfs->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(zfsvfs, tx);
            dmu_tx_commit(tx);
        }
        if (error) {
            mutex_exit(&zfsvfs->z_lock);
            VN_RELE(vp);
            ZFS_EXIT(zfsvfs);
            return (error);
        }
    }
    mutex_exit(&zfsvfs->z_lock);

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

    switch (zc->zc_cookie) {
    case ZFS_SMB_ACL_ADD:
        vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
        vattr.va_type = VREG;
        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(zfsvfs);
            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(zfsvfs);
            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(zfsvfs);

    return (error);
}

/*
 * inputs:
 * zc_name  name of filesystem
 * zc_value short name of snap
 * zc_string    user-supplied tag for this reference
 * zc_cookie    recursive flag
 * zc_temphold  set if hold is temporary
 *
 * outputs:     none
 */
static int
zfs_ioc_hold(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_hold(zc->zc_name, zc->zc_value,
        zc->zc_string, recursive, zc->zc_temphold));
}

/*
 * inputs:
 * zc_name  name of dataset from which we're releasing a user reference
 * zc_value short name of snap
 * zc_string    user-supplied tag for this reference
 * 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);
}

/*
 * 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,
        B_FALSE },
    { zfs_ioc_pool_destroy, zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_import, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_FALSE },
    { zfs_ioc_pool_export, zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_configs, zfs_secpolicy_none, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_stats, zfs_secpolicy_read, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_tryimport, zfs_secpolicy_config, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_scrub, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_pool_freeze, zfs_secpolicy_config, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_pool_upgrade, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_pool_get_history, zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_vdev_add, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_vdev_remove, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_vdev_set_state, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_FALSE },
    { zfs_ioc_vdev_attach, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_vdev_detach, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_vdev_setpath, zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_TRUE },
    { zfs_ioc_vdev_setfru,  zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_TRUE },
    { zfs_ioc_objset_stats, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_objset_zplprops, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_dataset_list_next, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_snapshot_list_next, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_set_prop, zfs_secpolicy_none, DATASET_NAME, B_TRUE, B_TRUE },
    { zfs_ioc_create, zfs_secpolicy_create, DATASET_NAME, B_TRUE, B_TRUE },
    { zfs_ioc_destroy, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE,
        B_TRUE},
    { zfs_ioc_rollback, zfs_secpolicy_rollback, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_rename, zfs_secpolicy_rename, DATASET_NAME, B_TRUE, B_TRUE },
    { zfs_ioc_recv, zfs_secpolicy_receive, DATASET_NAME, B_TRUE, B_TRUE },
    { zfs_ioc_send, zfs_secpolicy_send, DATASET_NAME, B_TRUE, B_FALSE },
    { zfs_ioc_inject_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_clear_fault, zfs_secpolicy_inject, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_inject_list_next, zfs_secpolicy_inject, NO_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_error_log, zfs_secpolicy_inject, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_clear, zfs_secpolicy_config, POOL_NAME, B_TRUE, B_FALSE },
    { zfs_ioc_promote, zfs_secpolicy_promote, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_destroy_snaps, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_snapshot, zfs_secpolicy_snapshot, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_dsobj_to_dsname, zfs_secpolicy_config, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_obj_to_path, zfs_secpolicy_config, DATASET_NAME, B_FALSE,
        B_TRUE },
    { zfs_ioc_pool_set_props, zfs_secpolicy_config, POOL_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_pool_get_props, zfs_secpolicy_read, POOL_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_set_fsacl, zfs_secpolicy_fsacl, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_get_fsacl, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_iscsi_perm_check, zfs_secpolicy_iscsi, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_share, zfs_secpolicy_share, DATASET_NAME, B_FALSE, B_FALSE },
    { zfs_ioc_inherit_prop, zfs_secpolicy_inherit, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_smb_acl, zfs_secpolicy_smb_acl, DATASET_NAME, B_FALSE,
        B_FALSE },
    { zfs_ioc_userspace_one, zfs_secpolicy_userspace_one,
        DATASET_NAME, B_FALSE, B_FALSE },
    { zfs_ioc_userspace_many, zfs_secpolicy_userspace_many,
        DATASET_NAME, B_FALSE, B_FALSE },
    { zfs_ioc_userspace_upgrade, zfs_secpolicy_userspace_upgrade,
        DATASET_NAME, B_FALSE, B_TRUE },
    { zfs_ioc_hold, zfs_secpolicy_hold, DATASET_NAME, B_TRUE, B_TRUE },
    { zfs_ioc_release, zfs_secpolicy_release, DATASET_NAME, B_TRUE,
        B_TRUE },
    { zfs_ioc_get_holds, zfs_secpolicy_read, DATASET_NAME, B_FALSE,
        B_TRUE }
};

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

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

    error = spa_open(name, &spa, FTAG);
    if (error == 0) {
        if (spa_suspended(spa))
            error = EAGAIN;
        spa_close(spa, FTAG);
    }
    return (error);
}

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 = ddi_copyin((void *)arg, zc, sizeof (zfs_cmd_t), flag);

    if ((error == 0) && !(flag & FKIOCTL))
        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';
        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;
            if (zfs_ioc_vec[vec].zvec_pool_check)
                error = pool_status_check(zc->zc_name,
                    zfs_ioc_vec[vec].zvec_namecheck);
            break;

        case DATASET_NAME:
            if (dataset_namecheck(zc->zc_name, NULL, NULL) != 0)
                error = EINVAL;
            if (zfs_ioc_vec[vec].zvec_pool_check)
                error = pool_status_check(zc->zc_name,
                    zfs_ioc_vec[vec].zvec_namecheck);
            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) {
        error = rc;
        if (zfs_ioc_vec[vec].zvec_his_log)
            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 */
    zvol_dump,  /* 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 */
    NULL,       /* power */
    ddi_quiesce_not_needed, /* quiesce */
};

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

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


uint_t zfs_fsyncer_key;
extern uint_t rrw_tsd_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);
    tsd_create(&rrw_tsd_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_nfsshare_inited)
        (void) ddi_modclose(nfs_mod);
    if (zfs_smbshare_inited)
        (void) ddi_modclose(smbsrv_mod);
    if (zfs_nfsshare_inited || zfs_smbshare_inited)
        (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));
}