libzfs/common/libzfs_dataset.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <zone.h>
#include <fcntl.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/mount.h>

#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/zap.h>
#include <libzfs.h>

#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "libzfs_impl.h"

static int zvol_create_link_common(libzfs_handle_t *, const char *, int);

/*
 * Given a single type (not a mask of types), return the type in a human
 * readable form.
 */
const char *
zfs_type_to_name(zfs_type_t type)
{
        switch (type) {
        case ZFS_TYPE_FILESYSTEM:
                return (dgettext(TEXT_DOMAIN, "filesystem"));
        case ZFS_TYPE_SNAPSHOT:
                return (dgettext(TEXT_DOMAIN, "snapshot"));
        case ZFS_TYPE_VOLUME:
                return (dgettext(TEXT_DOMAIN, "volume"));
        }

        return (NULL);
}

/*
 * Given a path and mask of ZFS types, return a string describing this dataset.
 * This is used when we fail to open a dataset and we cannot get an exact type.
 * We guess what the type would have been based on the path and the mask of
 * acceptable types.
 */
static const char *
path_to_str(const char *path, int types)
{
        /*
         * When given a single type, always report the exact type.
         */
        if (types == ZFS_TYPE_SNAPSHOT)
                return (dgettext(TEXT_DOMAIN, "snapshot"));
        if (types == ZFS_TYPE_FILESYSTEM)
                return (dgettext(TEXT_DOMAIN, "filesystem"));
        if (types == ZFS_TYPE_VOLUME)
                return (dgettext(TEXT_DOMAIN, "volume"));

        /*
         * The user is requesting more than one type of dataset.  If this is the
         * case, consult the path itself.  If we're looking for a snapshot, and
         * a '@' is found, then report it as "snapshot".  Otherwise, remove the
         * snapshot attribute and try again.
         */
        if (types & ZFS_TYPE_SNAPSHOT) {
                if (strchr(path, '@') != NULL)
                        return (dgettext(TEXT_DOMAIN, "snapshot"));
                return (path_to_str(path, types & ~ZFS_TYPE_SNAPSHOT));
        }


        /*
         * The user has requested either filesystems or volumes.
         * We have no way of knowing a priori what type this would be, so always
         * report it as "filesystem" or "volume", our two primitive types.
         */
        if (types & ZFS_TYPE_FILESYSTEM)
                return (dgettext(TEXT_DOMAIN, "filesystem"));

        assert(types & ZFS_TYPE_VOLUME);
        return (dgettext(TEXT_DOMAIN, "volume"));
}

/*
 * Validate a ZFS path.  This is used even before trying to open the dataset, to
 * provide a more meaningful error message.  We place a more useful message in
 * 'buf' detailing exactly why the name was not valid.
 */
static int
zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type)
{
        namecheck_err_t why;
        char what;

        if (dataset_namecheck(path, &why, &what) != 0) {
                if (hdl != NULL) {
                        switch (why) {
                        case NAME_ERR_TOOLONG:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "name is too long"));
                                break;

                        case NAME_ERR_LEADING_SLASH:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "leading slash in name"));
                                break;

                        case NAME_ERR_EMPTY_COMPONENT:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "empty component in name"));
                                break;

                        case NAME_ERR_TRAILING_SLASH:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "trailing slash in name"));
                                break;

                        case NAME_ERR_INVALCHAR:
                                zfs_error_aux(hdl,
                                    dgettext(TEXT_DOMAIN, "invalid character "
                                    "'%c' in name"), what);
                                break;

                        case NAME_ERR_MULTIPLE_AT:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "multiple '@' delimiters in name"));
                                break;

                        case NAME_ERR_NOLETTER:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "pool doesn't begin with a letter"));
                                break;

                        case NAME_ERR_RESERVED:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "name is reserved"));
                                break;

                        case NAME_ERR_DISKLIKE:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "reserved disk name"));
                                break;
                        }
                }

                return (0);
        }

        if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
                if (hdl != NULL)
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "snapshot delimiter '@' in filesystem name"));
                return (0);
        }

        if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
                if (hdl != NULL)
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "missing '@' delimiter in snapshot name"));
                return (0);
        }

        return (-1);
}

int
zfs_name_valid(const char *name, zfs_type_t type)
{
        return (zfs_validate_name(NULL, name, type));
}

/*
 * This function takes the raw DSL properties, and filters out the user-defined
 * properties into a separate nvlist.
 */
static int
process_user_props(zfs_handle_t *zhp)
{
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        nvpair_t *elem;
        nvlist_t *propval;

        nvlist_free(zhp->zfs_user_props);

        if (nvlist_alloc(&zhp->zfs_user_props, NV_UNIQUE_NAME, 0) != 0)
                return (no_memory(hdl));

        elem = NULL;
        while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
                if (!zfs_prop_user(nvpair_name(elem)))
                        continue;

                verify(nvpair_value_nvlist(elem, &propval) == 0);
                if (nvlist_add_nvlist(zhp->zfs_user_props,
                    nvpair_name(elem), propval) != 0)
                        return (no_memory(hdl));
        }

        return (0);
}

/*
 * Utility function to gather stats (objset and zpl) for the given object.
 */
static int
get_stats(zfs_handle_t *zhp)
{
        zfs_cmd_t zc = { 0 };
        libzfs_handle_t *hdl = zhp->zfs_hdl;

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

        if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
                return (-1);

        while (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
                if (errno == ENOMEM) {
                        if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
                                zcmd_free_nvlists(&zc);
                                return (-1);
                        }
                } else {
                        zcmd_free_nvlists(&zc);
                        return (-1);
                }
        }

        zhp->zfs_dmustats = zc.zc_objset_stats; /* structure assignment */

        (void) strlcpy(zhp->zfs_root, zc.zc_value, sizeof (zhp->zfs_root));

        if (zhp->zfs_props) {
                nvlist_free(zhp->zfs_props);
                zhp->zfs_props = NULL;
        }

        if (zcmd_read_dst_nvlist(hdl, &zc, &zhp->zfs_props) != 0) {
                zcmd_free_nvlists(&zc);
                return (-1);
        }

        zcmd_free_nvlists(&zc);

        if (process_user_props(zhp) != 0)
                return (-1);

        return (0);
}

/*
 * Refresh the properties currently stored in the handle.
 */
void
zfs_refresh_properties(zfs_handle_t *zhp)
{
        (void) get_stats(zhp);
}

/*
 * Makes a handle from the given dataset name.  Used by zfs_open() and
 * zfs_iter_* to create child handles on the fly.
 */
zfs_handle_t *
make_dataset_handle(libzfs_handle_t *hdl, const char *path)
{
        zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

        if (zhp == NULL)
                return (NULL);

        zhp->zfs_hdl = hdl;

top:
        (void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));

        if (get_stats(zhp) != 0) {
                free(zhp);
                return (NULL);
        }

        if (zhp->zfs_dmustats.dds_inconsistent) {
                zfs_cmd_t zc = { 0 };

                /*
                 * If it is dds_inconsistent, then we've caught it in
                 * the middle of a 'zfs receive' or 'zfs destroy', and
                 * it is inconsistent from the ZPL's point of view, so
                 * can't be mounted.  However, it could also be that we
                 * have crashed in the middle of one of those
                 * operations, in which case we need to get rid of the
                 * inconsistent state.  We do that by either rolling
                 * back to the previous snapshot (which will fail if
                 * there is none), or destroying the filesystem.  Note
                 * that if we are still in the middle of an active
                 * 'receive' or 'destroy', then the rollback and destroy
                 * will fail with EBUSY and we will drive on as usual.
                 */

                (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

                if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL) {
                        (void) zvol_remove_link(hdl, zhp->zfs_name);
                        zc.zc_objset_type = DMU_OST_ZVOL;
                } else {
                        zc.zc_objset_type = DMU_OST_ZFS;
                }

                /* If we can successfully roll it back, reget the stats */
                if (ioctl(hdl->libzfs_fd, ZFS_IOC_ROLLBACK, &zc) == 0)
                        goto top;
                /*
                 * If we can sucessfully destroy it, pretend that it
                 * never existed.
                 */
                if (ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc) == 0) {
                        free(zhp);
                        errno = ENOENT;
                        return (NULL);
                }
        }

        /*
         * We've managed to open the dataset and gather statistics.  Determine
         * the high-level type.
         */
        if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
                zhp->zfs_head_type = ZFS_TYPE_VOLUME;
        else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
                zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
        else
                abort();

        if (zhp->zfs_dmustats.dds_is_snapshot)
                zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
        else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
                zhp->zfs_type = ZFS_TYPE_VOLUME;
        else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
                zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
        else
                abort();        /* we should never see any other types */

        return (zhp);
}

/*
 * Opens the given snapshot, filesystem, or volume.   The 'types'
 * argument is a mask of acceptable types.  The function will print an
 * appropriate error message and return NULL if it can't be opened.
 */
zfs_handle_t *
zfs_open(libzfs_handle_t *hdl, const char *path, int types)
{
        zfs_handle_t *zhp;
        char errbuf[1024];

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);

        /*
         * Validate the name before we even try to open it.
         */
        if (!zfs_validate_name(hdl, path, ZFS_TYPE_ANY)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "invalid dataset name"));
                (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
                return (NULL);
        }

        /*
         * Try to get stats for the dataset, which will tell us if it exists.
         */
        errno = 0;
        if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
                (void) zfs_standard_error(hdl, errno, errbuf);
                return (NULL);
        }

        if (!(types & zhp->zfs_type)) {
                (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
                zfs_close(zhp);
                return (NULL);
        }

        return (zhp);
}

/*
 * Release a ZFS handle.  Nothing to do but free the associated memory.
 */
void
zfs_close(zfs_handle_t *zhp)
{
        if (zhp->zfs_mntopts)
                free(zhp->zfs_mntopts);
        nvlist_free(zhp->zfs_props);
        nvlist_free(zhp->zfs_user_props);
        free(zhp);
}

/*
 * Given a numeric suffix, convert the value into a number of bits that the
 * resulting value must be shifted.
 */
static int
str2shift(libzfs_handle_t *hdl, const char *buf)
{
        const char *ends = "BKMGTPEZ";
        int i;

        if (buf[0] == '\0')
                return (0);
        for (i = 0; i < strlen(ends); i++) {
                if (toupper(buf[0]) == ends[i])
                        break;
        }
        if (i == strlen(ends)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "invalid numeric suffix '%s'"), buf);
                return (-1);
        }

        /*
         * We want to allow trailing 'b' characters for 'GB' or 'Mb'.  But don't
         * allow 'BB' - that's just weird.
         */
        if (buf[1] == '\0' || (toupper(buf[1]) == 'B' && buf[2] == '\0' &&
            toupper(buf[0]) != 'B'))
                return (10*i);

        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
            "invalid numeric suffix '%s'"), buf);
        return (-1);
}

/*
 * Convert a string of the form '100G' into a real number.  Used when setting
 * properties or creating a volume.  'buf' is used to place an extended error
 * message for the caller to use.
 */
static int
nicestrtonum(libzfs_handle_t *hdl, const char *value, uint64_t *num)
{
        char *end;
        int shift;

        *num = 0;

        /* Check to see if this looks like a number.  */
        if ((value[0] < '0' || value[0] > '9') && value[0] != '.') {
                if (hdl)
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "bad numeric value '%s'"), value);
                return (-1);
        }

        /* Rely on stroll() to process the numeric portion.  */
        errno = 0;
        *num = strtoll(value, &end, 10);

        /*
         * Check for ERANGE, which indicates that the value is too large to fit
         * in a 64-bit value.
         */
        if (errno == ERANGE) {
                if (hdl)
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "numeric value is too large"));
                return (-1);
        }

        /*
         * If we have a decimal value, then do the computation with floating
         * point arithmetic.  Otherwise, use standard arithmetic.
         */
        if (*end == '.') {
                double fval = strtod(value, &end);

                if ((shift = str2shift(hdl, end)) == -1)
                        return (-1);

                fval *= pow(2, shift);

                if (fval > UINT64_MAX) {
                        if (hdl)
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "numeric value is too large"));
                        return (-1);
                }

                *num = (uint64_t)fval;
        } else {
                if ((shift = str2shift(hdl, end)) == -1)
                        return (-1);

                /* Check for overflow */
                if (shift >= 64 || (*num << shift) >> shift != *num) {
                        if (hdl)
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "numeric value is too large"));
                        return (-1);
                }

                *num <<= shift;
        }

        return (0);
}

int
zfs_nicestrtonum(libzfs_handle_t *hdl, const char *str, uint64_t *val)
{
        return (nicestrtonum(hdl, str, val));
}

/*
 * The prop_parse_*() functions are designed to allow flexibility in callers
 * when setting properties.  At the DSL layer, all properties are either 64-bit
 * numbers or strings.  We want the user to be able to ignore this fact and
 * specify properties as native values (boolean, for example) or as strings (to
 * simplify command line utilities).  This also handles converting index types
 * (compression, checksum, etc) from strings to their on-disk index.
 */

static int
prop_parse_boolean(libzfs_handle_t *hdl, nvpair_t *elem, uint64_t *val)
{
        uint64_t ret;

        switch (nvpair_type(elem)) {
        case DATA_TYPE_STRING:
                {
                        char *value;
                        verify(nvpair_value_string(elem, &value) == 0);

                        if (strcmp(value, "on") == 0) {
                                ret = 1;
                        } else if (strcmp(value, "off") == 0) {
                                ret = 0;
                        } else {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "property '%s' must be 'on' or 'off'"),
                                    nvpair_name(elem));
                                return (-1);
                        }
                        break;
                }

        case DATA_TYPE_UINT64:
                {
                        verify(nvpair_value_uint64(elem, &ret) == 0);
                        if (ret > 1) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be a boolean value"),
                                    nvpair_name(elem));
                                return (-1);
                        }
                        break;
                }

        case DATA_TYPE_BOOLEAN_VALUE:
                {
                        boolean_t value;
                        verify(nvpair_value_boolean_value(elem, &value) == 0);
                        ret = value;
                        break;
                }

        default:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "'%s' must be a boolean value"),
                    nvpair_name(elem));
                return (-1);
        }

        *val = ret;
        return (0);
}

static int
prop_parse_number(libzfs_handle_t *hdl, nvpair_t *elem, zfs_prop_t prop,
    uint64_t *val)
{
        uint64_t ret;
        boolean_t isnone = B_FALSE;

        switch (nvpair_type(elem)) {
        case DATA_TYPE_STRING:
                {
                        char *value;
                        (void) nvpair_value_string(elem, &value);
                        if (strcmp(value, "none") == 0) {
                                isnone = B_TRUE;
                                ret = 0;
                        } else if (nicestrtonum(hdl, value, &ret) != 0) {
                                return (-1);
                        }
                        break;
                }

        case DATA_TYPE_UINT64:
                (void) nvpair_value_uint64(elem, &ret);
                break;

        default:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "'%s' must be a number"),
                    nvpair_name(elem));
                return (-1);
        }

        /*
         * Quota special: force 'none' and don't allow 0.
         */
        if (ret == 0 && !isnone && prop == ZFS_PROP_QUOTA) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "use 'none' to disable quota"));
                return (-1);
        }

        *val = ret;
        return (0);
}

static int
prop_parse_index(libzfs_handle_t *hdl, nvpair_t *elem, zfs_prop_t prop,
    uint64_t *val)
{
        char *propname = nvpair_name(elem);
        char *value;

        if (nvpair_type(elem) != DATA_TYPE_STRING) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "'%s' must be a string"), propname);
                return (-1);
        }

        (void) nvpair_value_string(elem, &value);

        if (zfs_prop_string_to_index(prop, value, val) != 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "'%s' must be one of '%s'"), propname,
                    zfs_prop_values(prop));
                return (-1);
        }

        return (0);
}

/*
 * Check if the bootfs name has the same pool name as it is set to.
 * Assuming bootfs is a valid dataset name.
 */
static boolean_t
bootfs_poolname_valid(char *pool, char *bootfs)
{
        char ch, *pname;

        /* get the pool name from the bootfs name */
        pname = bootfs;
        while (*bootfs && !isspace(*bootfs) && *bootfs != '/')
                bootfs++;

        ch = *bootfs;
        *bootfs = 0;

        if (strcmp(pool, pname) == 0) {
                *bootfs = ch;
                return (B_TRUE);
        }

        *bootfs = ch;
        return (B_FALSE);
}

/*
 * Given an nvlist of properties to set, validates that they are correct, and
 * parses any numeric properties (index, boolean, etc) if they are specified as
 * strings.
 */
nvlist_t *
zfs_validate_properties(libzfs_handle_t *hdl, zfs_type_t type, char *pool_name,
    nvlist_t *nvl, uint64_t zoned, zfs_handle_t *zhp, const char *errbuf)
{
        nvpair_t *elem;
        const char *propname;
        zfs_prop_t prop;
        uint64_t intval;
        char *strval;
        nvlist_t *ret;
        int isuser;

        if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
                (void) no_memory(hdl);
                return (NULL);
        }

        if (type == ZFS_TYPE_SNAPSHOT) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "snapshot properties cannot be modified"));
                (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
                goto error;
        }

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

                /*
                 * Make sure this property is valid and applies to this type.
                 */
                if ((prop = zfs_name_to_prop_common(propname, type))
                    == ZFS_PROP_INVAL) {
                        isuser = zfs_prop_user(propname);
                        if (!isuser || (isuser && (type & ZFS_TYPE_POOL))) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "invalid property '%s'"),
                                    propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        } else {
                                /*
                                 * If this is a user property, make sure it's a
                                 * string, and that it's less than
                                 * ZAP_MAXNAMELEN.
                                 */
                                if (nvpair_type(elem) != DATA_TYPE_STRING) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' must be a string"),
                                            propname);
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }

                                if (strlen(nvpair_name(elem)) >=
                                    ZAP_MAXNAMELEN) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "property name '%s' is too long"),
                                            propname);
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }
                        }

                        (void) nvpair_value_string(elem, &strval);
                        if (nvlist_add_string(ret, propname, strval) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }
                        continue;
                }

                /*
                 * Normalize the name, to get rid of shorthand abbrevations.
                 */
                propname = zfs_prop_to_name(prop);

                if (!zfs_prop_valid_for_type(prop, type)) {
                        zfs_error_aux(hdl,
                            dgettext(TEXT_DOMAIN, "'%s' does not "
                            "apply to datasets of this type"), propname);
                        (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
                        goto error;
                }

                if (zfs_prop_readonly(prop) &&
                    (prop != ZFS_PROP_VOLBLOCKSIZE || zhp != NULL)) {
                        zfs_error_aux(hdl,
                            dgettext(TEXT_DOMAIN, "'%s' is readonly"),
                            propname);
                        (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
                        goto error;
                }

                /*
                 * Convert any properties to the internal DSL value types.
                 */
                strval = NULL;
                switch (zfs_prop_get_type(prop)) {
                case prop_type_boolean:
                        if (prop_parse_boolean(hdl, elem, &intval) != 0) {
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case prop_type_string:
                        if (nvpair_type(elem) != DATA_TYPE_STRING) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be a string"),
                                    propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        (void) nvpair_value_string(elem, &strval);
                        if (strlen(strval) >= ZFS_MAXPROPLEN) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' is too long"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case prop_type_number:
                        if (prop_parse_number(hdl, elem, prop, &intval) != 0) {
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case prop_type_index:
                        if (prop_parse_index(hdl, elem, prop, &intval) != 0) {
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                default:
                        abort();
                }

                /*
                 * Add the result to our return set of properties.
                 */
                if (strval) {
                        if (nvlist_add_string(ret, propname, strval) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }
                } else if (nvlist_add_uint64(ret, propname, intval) != 0) {
                        (void) no_memory(hdl);
                        goto error;
                }

                /*
                 * Perform some additional checks for specific properties.
                 */
                switch (prop) {
                case ZFS_PROP_RECORDSIZE:
                case ZFS_PROP_VOLBLOCKSIZE:
                        /* must be power of two within SPA_{MIN,MAX}BLOCKSIZE */
                        if (intval < SPA_MINBLOCKSIZE ||
                            intval > SPA_MAXBLOCKSIZE || !ISP2(intval)) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be power of 2 from %u "
                                    "to %uk"), propname,
                                    (uint_t)SPA_MINBLOCKSIZE,
                                    (uint_t)SPA_MAXBLOCKSIZE >> 10);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        break;

                case ZFS_PROP_SHAREISCSI:
                        if (strcmp(strval, "off") != 0 &&
                            strcmp(strval, "on") != 0 &&
                            strcmp(strval, "type=disk") != 0) {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be 'on', 'off', or 'type=disk'"),
                                    propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }

                        break;

                case ZFS_PROP_MOUNTPOINT:
                        if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
                            strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
                                break;

                        if (strval[0] != '/') {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' must be an absolute path, "
                                    "'none', or 'legacy'"), propname);
                                (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
                                goto error;
                        }
                        /*FALLTHRU*/

                case ZFS_PROP_SHARENFS:
                        /*
                         * For the mountpoint and sharenfs properties, check if
                         * it can be set in a global/non-global zone based on
                         * the zoned property value:
                         *
                         *              global zone         non-global zone
                         * --------------------------------------------------
                         * zoned=on     mountpoint (no)     mountpoint (yes)
                         *              sharenfs (no)       sharenfs (no)
                         *
                         * zoned=off    mountpoint (yes)        N/A
                         *              sharenfs (yes)
                         */
                        if (zoned) {
                                if (getzoneid() == GLOBAL_ZONEID) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' cannot be set on "
                                            "dataset in a non-global zone"),
                                            propname);
                                        (void) zfs_error(hdl, EZFS_ZONED,
                                            errbuf);
                                        goto error;
                                } else if (prop == ZFS_PROP_SHARENFS) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' cannot be set in "
                                            "a non-global zone"), propname);
                                        (void) zfs_error(hdl, EZFS_ZONED,
                                            errbuf);
                                        goto error;
                                }
                        } else if (getzoneid() != GLOBAL_ZONEID) {
                                /*
                                 * If zoned property is 'off', this must be in
                                 * a globle zone. If not, something is wrong.
                                 */
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "'%s' cannot be set while dataset "
                                    "'zoned' property is set"), propname);
                                (void) zfs_error(hdl, EZFS_ZONED, errbuf);
                                goto error;
                        }

                        break;

                case ZFS_PROP_BOOTFS:
                        /*
                         * bootfs property value has to be a dataset name and
                         * the dataset has to be in the same pool as it sets to.
                         */
                        if (strval[0] != '\0' && (!zfs_name_valid(strval,
                            ZFS_TYPE_FILESYSTEM) || !bootfs_poolname_valid(
                            pool_name, strval))) {

                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "'%s' "
                                    "is an invalid name"), strval);
                                (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
                                goto error;
                        }
                        break;
                }

                /*
                 * For changes to existing volumes, we have some additional
                 * checks to enforce.
                 */
                if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
                        uint64_t volsize = zfs_prop_get_int(zhp,
                            ZFS_PROP_VOLSIZE);
                        uint64_t blocksize = zfs_prop_get_int(zhp,
                            ZFS_PROP_VOLBLOCKSIZE);
                        char buf[64];

                        switch (prop) {
                        case ZFS_PROP_RESERVATION:
                                if (intval > volsize) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' is greater than current "
                                            "volume size"), propname);
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }
                                break;

                        case ZFS_PROP_VOLSIZE:
                                if (intval % blocksize != 0) {
                                        zfs_nicenum(blocksize, buf,
                                            sizeof (buf));
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' must be a multiple of "
                                            "volume block size (%s)"),
                                            propname, buf);
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }

                                if (intval == 0) {
                                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                            "'%s' cannot be zero"),
                                            propname);
                                        (void) zfs_error(hdl, EZFS_BADPROP,
                                            errbuf);
                                        goto error;
                                }
                                break;
                        }
                }
        }

        /*
         * If this is an existing volume, and someone is setting the volsize,
         * make sure that it matches the reservation, or add it if necessary.
         */
        if (zhp != NULL && type == ZFS_TYPE_VOLUME &&
            nvlist_lookup_uint64(ret, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
            &intval) == 0) {
                uint64_t old_volsize = zfs_prop_get_int(zhp,
                    ZFS_PROP_VOLSIZE);
                uint64_t old_reservation = zfs_prop_get_int(zhp,
                    ZFS_PROP_RESERVATION);
                uint64_t new_reservation;

                if (old_volsize == old_reservation &&
                    nvlist_lookup_uint64(ret,
                    zfs_prop_to_name(ZFS_PROP_RESERVATION),
                    &new_reservation) != 0) {
                        if (nvlist_add_uint64(ret,
                            zfs_prop_to_name(ZFS_PROP_RESERVATION),
                            intval) != 0) {
                                (void) no_memory(hdl);
                                goto error;
                        }
                }
        }

        return (ret);

error:
        nvlist_free(ret);
        return (NULL);
}

/*
 * Given a property name and value, set the property for the given dataset.
 */
int
zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
{
        zfs_cmd_t zc = { 0 };
        int ret = -1;
        prop_changelist_t *cl = NULL;
        char errbuf[1024];
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        nvlist_t *nvl = NULL, *realprops;
        zfs_prop_t prop;

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
            zhp->zfs_name);

        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
            nvlist_add_string(nvl, propname, propval) != 0) {
                (void) no_memory(hdl);
                goto error;
        }

        if ((realprops = zfs_validate_properties(hdl, zhp->zfs_type, NULL, nvl,
            zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, errbuf)) == NULL)
                goto error;
        nvlist_free(nvl);
        nvl = realprops;

        prop = zfs_name_to_prop(propname);

        /* We don't support those properties on FreeBSD. */
        switch (prop) {
        case ZFS_PROP_SHAREISCSI:
        case ZFS_PROP_DEVICES:
        case ZFS_PROP_ACLMODE:
        case ZFS_PROP_ACLINHERIT:
        case ZFS_PROP_ISCSIOPTIONS:
                (void) snprintf(errbuf, sizeof (errbuf),
                    "property '%s' not supported on FreeBSD", propname);
                ret = zfs_error(hdl, EZFS_PERM, errbuf);
                goto error;
        }

        if ((cl = changelist_gather(zhp, prop, 0)) == NULL)
                goto error;

        if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "child dataset with inherited mountpoint is used "
                    "in a non-global zone"));
                ret = zfs_error(hdl, EZFS_ZONED, errbuf);
                goto error;
        }

        if ((ret = changelist_prefix(cl)) != 0)
                goto error;

        /*
         * Execute the corresponding ioctl() to set this property.
         */
        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

        if (zcmd_write_src_nvlist(hdl, &zc, nvl, NULL) != 0)
                goto error;

        ret = ioctl(hdl->libzfs_fd, ZFS_IOC_SET_PROP, &zc);

        if (ret != 0) {
                switch (errno) {

                case ENOSPC:
                        /*
                         * For quotas and reservations, ENOSPC indicates
                         * something different; setting a quota or reservation
                         * doesn't use any disk space.
                         */
                        switch (prop) {
                        case ZFS_PROP_QUOTA:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "size is less than current used or "
                                    "reserved space"));
                                (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
                                break;

                        case ZFS_PROP_RESERVATION:
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "size is greater than available space"));
                                (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
                                break;

                        default:
                                (void) zfs_standard_error(hdl, errno, errbuf);
                                break;
                        }
                        break;

                case EBUSY:
                        if (prop == ZFS_PROP_VOLBLOCKSIZE)
                                (void) zfs_error(hdl, EZFS_VOLHASDATA, errbuf);
                        else
                                (void) zfs_standard_error(hdl, EBUSY, errbuf);
                        break;

                case EROFS:
                        (void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
                        break;

                case ENOTSUP:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "pool must be upgraded to allow gzip compression"));
                        (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
                        break;

                case EOVERFLOW:
                        /*
                         * This platform can't address a volume this big.
                         */
#ifdef _ILP32
                        if (prop == ZFS_PROP_VOLSIZE) {
                                (void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
                                break;
                        }
#endif
                        /* FALLTHROUGH */
                default:
                        (void) zfs_standard_error(hdl, errno, errbuf);
                }
        } else {
                /*
                 * Refresh the statistics so the new property value
                 * is reflected.
                 */
                if ((ret = changelist_postfix(cl)) == 0)
                        (void) get_stats(zhp);
        }

error:
        nvlist_free(nvl);
        zcmd_free_nvlists(&zc);
        if (cl)
                changelist_free(cl);
        return (ret);
}

/*
 * Given a property, inherit the value from the parent dataset.
 */
int
zfs_prop_inherit(zfs_handle_t *zhp, const char *propname)
{
        zfs_cmd_t zc = { 0 };
        int ret;
        prop_changelist_t *cl;
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        char errbuf[1024];
        zfs_prop_t prop;

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot inherit %s for '%s'"), propname, zhp->zfs_name);

        if ((prop = zfs_name_to_prop(propname)) == ZFS_PROP_INVAL) {
                /*
                 * For user properties, the amount of work we have to do is very
                 * small, so just do it here.
                 */
                if (!zfs_prop_user(propname)) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "invalid property"));
                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));
                }

                (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
                (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));

                if (ioctl(zhp->zfs_hdl->libzfs_fd,
                    ZFS_IOC_SET_PROP, &zc) != 0)
                        return (zfs_standard_error(hdl, errno, errbuf));

                return (0);
        }

        /*
         * Verify that this property is inheritable.
         */
        if (zfs_prop_readonly(prop))
                return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));

        if (!zfs_prop_inheritable(prop))
                return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));

        /*
         * Check to see if the value applies to this type
         */
        if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
                return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));

        /*
         * Normalize the name, to get rid of shorthand abbrevations.
         */
        propname = zfs_prop_to_name(prop);
        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));

        if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
            zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "dataset is used in a non-global zone"));
                return (zfs_error(hdl, EZFS_ZONED, errbuf));
        }

        /*
         * Determine datasets which will be affected by this change, if any.
         */
        if ((cl = changelist_gather(zhp, prop, 0)) == NULL)
                return (-1);

        if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "child dataset with inherited mountpoint is used "
                    "in a non-global zone"));
                ret = zfs_error(hdl, EZFS_ZONED, errbuf);
                goto error;
        }

        if ((ret = changelist_prefix(cl)) != 0)
                goto error;

        if ((ret = ioctl(zhp->zfs_hdl->libzfs_fd,
            ZFS_IOC_SET_PROP, &zc)) != 0) {
                return (zfs_standard_error(hdl, errno, errbuf));
        } else {

                if ((ret = changelist_postfix(cl)) != 0)
                        goto error;

                /*
                 * Refresh the statistics so the new property is reflected.
                 */
                (void) get_stats(zhp);
        }

error:
        changelist_free(cl);
        return (ret);
}

void
nicebool(int value, char *buf, size_t buflen)
{
        if (value)
                (void) strlcpy(buf, "on", buflen);
        else
                (void) strlcpy(buf, "off", buflen);
}

/*
 * True DSL properties are stored in an nvlist.  The following two functions
 * extract them appropriately.
 */
static uint64_t
getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
{
        nvlist_t *nv;
        uint64_t value;

        *source = NULL;
        if (nvlist_lookup_nvlist(zhp->zfs_props,
            zfs_prop_to_name(prop), &nv) == 0) {
                verify(nvlist_lookup_uint64(nv, ZFS_PROP_VALUE, &value) == 0);
                (void) nvlist_lookup_string(nv, ZFS_PROP_SOURCE, source);
        } else {
                value = zfs_prop_default_numeric(prop);
                *source = "";
        }

        return (value);
}

static char *
getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
{
        nvlist_t *nv;
        char *value;

        *source = NULL;
        if (nvlist_lookup_nvlist(zhp->zfs_props,
            zfs_prop_to_name(prop), &nv) == 0) {
                verify(nvlist_lookup_string(nv, ZFS_PROP_VALUE, &value) == 0);
                (void) nvlist_lookup_string(nv, ZFS_PROP_SOURCE, source);
        } else {
                if ((value = (char *)zfs_prop_default_string(prop)) == NULL)
                        value = "";
                *source = "";
        }

        return (value);
}

/*
 * Internal function for getting a numeric property.  Both zfs_prop_get() and
 * zfs_prop_get_int() are built using this interface.
 *
 * Certain properties can be overridden using 'mount -o'.  In this case, scan
 * the contents of the /etc/mnttab entry, searching for the appropriate options.
 * If they differ from the on-disk values, report the current values and mark
 * the source "temporary".
 */
static int
get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zfs_source_t *src,
    char **source, uint64_t *val)
{
        struct mnttab mnt;
        char *mntopt_on = NULL;
        char *mntopt_off = NULL;

        *source = NULL;

        switch (prop) {
        case ZFS_PROP_ATIME:
                mntopt_on = MNTOPT_ATIME;
                mntopt_off = MNTOPT_NOATIME;
                break;

        case ZFS_PROP_DEVICES:
                mntopt_on = MNTOPT_DEVICES;
                mntopt_off = MNTOPT_NODEVICES;
                break;

        case ZFS_PROP_EXEC:
                mntopt_on = MNTOPT_EXEC;
                mntopt_off = MNTOPT_NOEXEC;
                break;

        case ZFS_PROP_READONLY:
                mntopt_on = MNTOPT_RO;
                mntopt_off = MNTOPT_RW;
                break;

        case ZFS_PROP_SETUID:
                mntopt_on = MNTOPT_SETUID;
                mntopt_off = MNTOPT_NOSETUID;
                break;

        case ZFS_PROP_XATTR:
                mntopt_on = MNTOPT_XATTR;
                mntopt_off = MNTOPT_NOXATTR;
                break;
        }

        /*
         * Because looking up the mount options is potentially expensive
         * (iterating over all of /etc/mnttab), we defer its calculation until
         * we're looking up a property which requires its presence.
         */
        if (!zhp->zfs_mntcheck &&
            (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
                struct mnttab entry, search = { 0 };
                FILE *mnttab = zhp->zfs_hdl->libzfs_mnttab;

                search.mnt_special = (char *)zhp->zfs_name;
                search.mnt_fstype = MNTTYPE_ZFS;
                rewind(mnttab);

                if (getmntany(mnttab, &entry, &search) == 0) {
                        zhp->zfs_mntopts = zfs_strdup(zhp->zfs_hdl,
                            entry.mnt_mntopts);
                        if (zhp->zfs_mntopts == NULL)
                                return (-1);
                }

                zhp->zfs_mntcheck = B_TRUE;
        }

        if (zhp->zfs_mntopts == NULL)
                mnt.mnt_mntopts = "";
        else
                mnt.mnt_mntopts = zhp->zfs_mntopts;

        switch (prop) {
        case ZFS_PROP_ATIME:
        case ZFS_PROP_DEVICES:
        case ZFS_PROP_EXEC:
        case ZFS_PROP_READONLY:
        case ZFS_PROP_SETUID:
        case ZFS_PROP_XATTR:
                *val = getprop_uint64(zhp, prop, source);

                if (hasmntopt(&mnt, mntopt_on) && !*val) {
                        *val = B_TRUE;
                        if (src)
                                *src = ZFS_SRC_TEMPORARY;
                } else if (hasmntopt(&mnt, mntopt_off) && *val) {
                        *val = B_FALSE;
                        if (src)
                                *src = ZFS_SRC_TEMPORARY;
                }
                break;

        case ZFS_PROP_RECORDSIZE:
        case ZFS_PROP_COMPRESSION:
        case ZFS_PROP_ZONED:
        case ZFS_PROP_CREATION:
        case ZFS_PROP_COMPRESSRATIO:
        case ZFS_PROP_REFERENCED:
        case ZFS_PROP_USED:
        case ZFS_PROP_CREATETXG:
        case ZFS_PROP_AVAILABLE:
        case ZFS_PROP_VOLSIZE:
        case ZFS_PROP_VOLBLOCKSIZE:
                *val = getprop_uint64(zhp, prop, source);
                break;

        case ZFS_PROP_CANMOUNT:
                *val = getprop_uint64(zhp, prop, source);
                if (*val == 0)
                        *source = zhp->zfs_name;
                else
                        *source = "";   /* default */
                break;

        case ZFS_PROP_QUOTA:
        case ZFS_PROP_RESERVATION:
                *val = getprop_uint64(zhp, prop, source);
                if (*val == 0)
                        *source = "";   /* default */
                else
                        *source = zhp->zfs_name;
                break;

        case ZFS_PROP_MOUNTED:
                *val = (zhp->zfs_mntopts != NULL);
                break;

        case ZFS_PROP_NUMCLONES:
                *val = zhp->zfs_dmustats.dds_num_clones;
                break;

        default:
                zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
                    "cannot get non-numeric property"));
                return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
                    dgettext(TEXT_DOMAIN, "internal error")));
        }

        return (0);
}

/*
 * Calculate the source type, given the raw source string.
 */
static void
get_source(zfs_handle_t *zhp, zfs_source_t *srctype, char *source,
    char *statbuf, size_t statlen)
{
        if (statbuf == NULL || *srctype == ZFS_SRC_TEMPORARY)
                return;

        if (source == NULL) {
                *srctype = ZFS_SRC_NONE;
        } else if (source[0] == '\0') {
                *srctype = ZFS_SRC_DEFAULT;
        } else {
                if (strcmp(source, zhp->zfs_name) == 0) {
                        *srctype = ZFS_SRC_LOCAL;
                } else {
                        (void) strlcpy(statbuf, source, statlen);
                        *srctype = ZFS_SRC_INHERITED;
                }
        }

}

/*
 * Retrieve a property from the given object.  If 'literal' is specified, then
 * numbers are left as exact values.  Otherwise, numbers are converted to a
 * human-readable form.
 *
 * Returns 0 on success, or -1 on error.
 */
int
zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
    zfs_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
{
        char *source = NULL;
        uint64_t val;
        char *str;
        const char *root;
        const char *strval;

        /*
         * Check to see if this property applies to our object
         */
        if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
                return (-1);

        if (src)
                *src = ZFS_SRC_NONE;

        switch (prop) {
        case ZFS_PROP_ATIME:
        case ZFS_PROP_READONLY:
        case ZFS_PROP_SETUID:
        case ZFS_PROP_ZONED:
        case ZFS_PROP_DEVICES:
        case ZFS_PROP_EXEC:
        case ZFS_PROP_CANMOUNT:
        case ZFS_PROP_XATTR:
                /*
                 * Basic boolean values are built on top of
                 * get_numeric_property().
                 */
                if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
                        return (-1);
                nicebool(val, propbuf, proplen);

                break;

        case ZFS_PROP_AVAILABLE:
        case ZFS_PROP_RECORDSIZE:
        case ZFS_PROP_CREATETXG:
        case ZFS_PROP_REFERENCED:
        case ZFS_PROP_USED:
        case ZFS_PROP_VOLSIZE:
        case ZFS_PROP_VOLBLOCKSIZE:
        case ZFS_PROP_NUMCLONES:
                /*
                 * Basic numeric values are built on top of
                 * get_numeric_property().
                 */
                if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
                        return (-1);
                if (literal)
                        (void) snprintf(propbuf, proplen, "%llu",
                            (u_longlong_t)val);
                else
                        zfs_nicenum(val, propbuf, proplen);
                break;

        case ZFS_PROP_COMPRESSION:
        case ZFS_PROP_CHECKSUM:
        case ZFS_PROP_SNAPDIR:
#ifdef  ZFS_NO_ACL
        case ZFS_PROP_ACLMODE:
        case ZFS_PROP_ACLINHERIT:
        case ZFS_PROP_COPIES:
                val = getprop_uint64(zhp, prop, &source);
                verify(zfs_prop_index_to_string(prop, val, &strval) == 0);
                (void) strlcpy(propbuf, strval, proplen);
                break;
#else   /* ZFS_NO_ACL */
        case ZFS_PROP_ACLMODE:
        case ZFS_PROP_ACLINHERIT:
                (void) strlcpy(propbuf, "<unsupported>", proplen);
                break;
#endif  /* ZFS_NO_ACL */

        case ZFS_PROP_CREATION:
                /*
                 * 'creation' is a time_t stored in the statistics.  We convert
                 * this into a string unless 'literal' is specified.
                 */
                {
                        val = getprop_uint64(zhp, prop, &source);
                        time_t time = (time_t)val;
                        struct tm t;

                        if (literal ||
                            localtime_r(&time, &t) == NULL ||
                            strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
                            &t) == 0)
                                (void) snprintf(propbuf, proplen, "%llu", val);
                }
                break;

        case ZFS_PROP_MOUNTPOINT:
                /*
                 * Getting the precise mountpoint can be tricky.
                 *
                 *  - for 'none' or 'legacy', return those values.
                 *  - for default mountpoints, construct it as /zfs/<dataset>
                 *  - for inherited mountpoints, we want to take everything
                 *    after our ancestor and append it to the inherited value.
                 *
                 * If the pool has an alternate root, we want to prepend that
                 * root to any values we return.
                 */
                root = zhp->zfs_root;
                str = getprop_string(zhp, prop, &source);

                if (str[0] == '\0') {
                        (void) snprintf(propbuf, proplen, "%s/zfs/%s",
                            root, zhp->zfs_name);
                } else if (str[0] == '/') {
                        const char *relpath = zhp->zfs_name + strlen(source);

                        if (relpath[0] == '/')
                                relpath++;
                        if (str[1] == '\0')
                                str++;

                        if (relpath[0] == '\0')
                                (void) snprintf(propbuf, proplen, "%s%s",
                                    root, str);
                        else
                                (void) snprintf(propbuf, proplen, "%s%s%s%s",
                                    root, str, relpath[0] == '@' ? "" : "/",
                                    relpath);
                } else {
                        /* 'legacy' or 'none' */
                        (void) strlcpy(propbuf, str, proplen);
                }

                break;

        case ZFS_PROP_SHARENFS:
        case ZFS_PROP_SHAREISCSI:
        case ZFS_PROP_ISCSIOPTIONS:
                (void) strlcpy(propbuf, getprop_string(zhp, prop, &source),
                    proplen);
                break;

        case ZFS_PROP_ORIGIN:
                (void) strlcpy(propbuf, getprop_string(zhp, prop, &source),
                    proplen);
                /*
                 * If there is no parent at all, return failure to indicate that
                 * it doesn't apply to this dataset.
                 */
                if (propbuf[0] == '\0')
                        return (-1);
                break;

        case ZFS_PROP_QUOTA:
        case ZFS_PROP_RESERVATION:
                if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
                        return (-1);

                /*
                 * If quota or reservation is 0, we translate this into 'none'
                 * (unless literal is set), and indicate that it's the default
                 * value.  Otherwise, we print the number nicely and indicate
                 * that its set locally.
                 */
                if (val == 0) {
                        if (literal)
                                (void) strlcpy(propbuf, "0", proplen);
                        else
                                (void) strlcpy(propbuf, "none", proplen);
                } else {
                        if (literal)
                                (void) snprintf(propbuf, proplen, "%llu",
                                    (u_longlong_t)val);
                        else
                                zfs_nicenum(val, propbuf, proplen);
                }
                break;

        case ZFS_PROP_COMPRESSRATIO:
                if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
                        return (-1);
                (void) snprintf(propbuf, proplen, "%lld.%02lldx", (longlong_t)
                    val / 100, (longlong_t)val % 100);
                break;

        case ZFS_PROP_TYPE:
                switch (zhp->zfs_type) {
                case ZFS_TYPE_FILESYSTEM:
                        str = "filesystem";
                        break;
                case ZFS_TYPE_VOLUME:
                        str = "volume";
                        break;
                case ZFS_TYPE_SNAPSHOT:
                        str = "snapshot";
                        break;
                default:
                        abort();
                }
                (void) snprintf(propbuf, proplen, "%s", str);
                break;

        case ZFS_PROP_MOUNTED:
                /*
                 * The 'mounted' property is a pseudo-property that described
                 * whether the filesystem is currently mounted.  Even though
                 * it's a boolean value, the typical values of "on" and "off"
                 * don't make sense, so we translate to "yes" and "no".
                 */
                if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
                    src, &source, &val) != 0)
                        return (-1);
                if (val)
                        (void) strlcpy(propbuf, "yes", proplen);
                else
                        (void) strlcpy(propbuf, "no", proplen);
                break;

        case ZFS_PROP_NAME:
                /*
                 * The 'name' property is a pseudo-property derived from the
                 * dataset name.  It is presented as a real property to simplify
                 * consumers.
                 */
                (void) strlcpy(propbuf, zhp->zfs_name, proplen);
                break;

        default:
                abort();
        }

        get_source(zhp, src, source, statbuf, statlen);

        return (0);
}

/*
 * Utility function to get the given numeric property.  Does no validation that
 * the given property is the appropriate type; should only be used with
 * hard-coded property types.
 */
uint64_t
zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
{
        char *source;
        zfs_source_t sourcetype = ZFS_SRC_NONE;
        uint64_t val;

        (void) get_numeric_property(zhp, prop, &sourcetype, &source, &val);

        return (val);
}

/*
 * Similar to zfs_prop_get(), but returns the value as an integer.
 */
int
zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
    zfs_source_t *src, char *statbuf, size_t statlen)
{
        char *source;

        /*
         * Check to see if this property applies to our object
         */
        if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
                return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
                    dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
                    zfs_prop_to_name(prop)));

        if (src)
                *src = ZFS_SRC_NONE;

        if (get_numeric_property(zhp, prop, src, &source, value) != 0)
                return (-1);

        get_source(zhp, src, source, statbuf, statlen);

        return (0);
}

/*
 * Returns the name of the given zfs handle.
 */
const char *
zfs_get_name(const zfs_handle_t *zhp)
{
        return (zhp->zfs_name);
}

/*
 * Returns the type of the given zfs handle.
 */
zfs_type_t
zfs_get_type(const zfs_handle_t *zhp)
{
        return (zhp->zfs_type);
}

/*
 * Iterate over all child filesystems
 */
int
zfs_iter_filesystems(zfs_handle_t *zhp, zfs_iter_f func, void *data)
{
        zfs_cmd_t zc = { 0 };
        zfs_handle_t *nzhp;
        int ret;

        for ((void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
            ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DATASET_LIST_NEXT, &zc) == 0;
            (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name))) {
                /*
                 * Ignore private dataset names.
                 */
                if (dataset_name_hidden(zc.zc_name))
                        continue;

                /*
                 * Silently ignore errors, as the only plausible explanation is
                 * that the pool has since been removed.
                 */
                if ((nzhp = make_dataset_handle(zhp->zfs_hdl,
                    zc.zc_name)) == NULL)
                        continue;

                if ((ret = func(nzhp, data)) != 0)
                        return (ret);
        }

        /*
         * An errno value of ESRCH indicates normal completion.  If ENOENT is
         * returned, then the underlying dataset has been removed since we
         * obtained the handle.
         */
        if (errno != ESRCH && errno != ENOENT)
                return (zfs_standard_error(zhp->zfs_hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot iterate filesystems")));

        return (0);
}

/*
 * Iterate over all snapshots
 */
int
zfs_iter_snapshots(zfs_handle_t *zhp, zfs_iter_f func, void *data)
{
        zfs_cmd_t zc = { 0 };
        zfs_handle_t *nzhp;
        int ret;

        for ((void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
            ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
            &zc) == 0;
            (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name))) {

                if ((nzhp = make_dataset_handle(zhp->zfs_hdl,
                    zc.zc_name)) == NULL)
                        continue;

                if ((ret = func(nzhp, data)) != 0)
                        return (ret);
        }

        /*
         * An errno value of ESRCH indicates normal completion.  If ENOENT is
         * returned, then the underlying dataset has been removed since we
         * obtained the handle.  Silently ignore this case, and return success.
         */
        if (errno != ESRCH && errno != ENOENT)
                return (zfs_standard_error(zhp->zfs_hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot iterate filesystems")));

        return (0);
}

/*
 * Iterate over all children, snapshots and filesystems
 */
int
zfs_iter_children(zfs_handle_t *zhp, zfs_iter_f func, void *data)
{
        int ret;

        if ((ret = zfs_iter_filesystems(zhp, func, data)) != 0)
                return (ret);

        return (zfs_iter_snapshots(zhp, func, data));
}

/*
 * Given a complete name, return just the portion that refers to the parent.
 * Can return NULL if this is a pool.
 */
static int
parent_name(const char *path, char *buf, size_t buflen)
{
        char *loc;

        if ((loc = strrchr(path, '/')) == NULL)
                return (-1);

        (void) strncpy(buf, path, MIN(buflen, loc - path));
        buf[loc - path] = '\0';

        return (0);
}

/*
 * Checks to make sure that the given path has a parent, and that it exists.  We
 * also fetch the 'zoned' property, which is used to validate property settings
 * when creating new datasets.
 */
static int
check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned)
{
        zfs_cmd_t zc = { 0 };
        char parent[ZFS_MAXNAMELEN];
        char *slash;
        zfs_handle_t *zhp;
        char errbuf[1024];

        (void) snprintf(errbuf, sizeof (errbuf), "cannot create '%s'",
            path);

        /* get parent, and check to see if this is just a pool */
        if (parent_name(path, parent, sizeof (parent)) != 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "missing dataset name"));
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
        }

        /* check to see if the pool exists */
        if ((slash = strchr(parent, '/')) == NULL)
                slash = parent + strlen(parent);
        (void) strncpy(zc.zc_name, parent, slash - parent);
        zc.zc_name[slash - parent] = '\0';
        if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
            errno == ENOENT) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "no such pool '%s'"), zc.zc_name);
                return (zfs_error(hdl, EZFS_NOENT, errbuf));
        }

        /* check to see if the parent dataset exists */
        if ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
                switch (errno) {
                case ENOENT:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "parent does not exist"));
                        return (zfs_error(hdl, EZFS_NOENT, errbuf));

                default:
                        return (zfs_standard_error(hdl, errno, errbuf));
                }
        }

        *zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
        /* we are in a non-global zone, but parent is in the global zone */
        if (getzoneid() != GLOBAL_ZONEID && !(*zoned)) {
                (void) zfs_standard_error(hdl, EPERM, errbuf);
                zfs_close(zhp);
                return (-1);
        }

        /* make sure parent is a filesystem */
        if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "parent is not a filesystem"));
                (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
                zfs_close(zhp);
                return (-1);
        }

        zfs_close(zhp);
        return (0);
}

/*
 * Create a new filesystem or volume.
 */
int
zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
    nvlist_t *props)
{
        zfs_cmd_t zc = { 0 };
        int ret;
        uint64_t size = 0;
        uint64_t blocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
        char errbuf[1024];
        uint64_t zoned;

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot create '%s'"), path);

        /* validate the path, taking care to note the extended error message */
        if (!zfs_validate_name(hdl, path, type))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        /* validate parents exist */
        if (check_parents(hdl, path, &zoned) != 0)
                return (-1);

        /*
         * The failure modes when creating a dataset of a different type over
         * one that already exists is a little strange.  In particular, if you
         * try to create a dataset on top of an existing dataset, the ioctl()
         * will return ENOENT, not EEXIST.  To prevent this from happening, we
         * first try to see if the dataset exists.
         */
        (void) strlcpy(zc.zc_name, path, sizeof (zc.zc_name));
        if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) == 0) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "dataset already exists"));
                return (zfs_error(hdl, EZFS_EXISTS, errbuf));
        }

        if (type == ZFS_TYPE_VOLUME)
                zc.zc_objset_type = DMU_OST_ZVOL;
        else
                zc.zc_objset_type = DMU_OST_ZFS;

        if (props && (props = zfs_validate_properties(hdl, type, NULL, props,
            zoned, NULL, errbuf)) == 0)
                return (-1);

        if (type == ZFS_TYPE_VOLUME) {
                /*
                 * If we are creating a volume, the size and block size must
                 * satisfy a few restraints.  First, the blocksize must be a
                 * valid block size between SPA_{MIN,MAX}BLOCKSIZE.  Second, the
                 * volsize must be a multiple of the block size, and cannot be
                 * zero.
                 */
                if (props == NULL || nvlist_lookup_uint64(props,
                    zfs_prop_to_name(ZFS_PROP_VOLSIZE), &size) != 0) {
                        nvlist_free(props);
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "missing volume size"));
                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));
                }

                if ((ret = nvlist_lookup_uint64(props,
                    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
                    &blocksize)) != 0) {
                        if (ret == ENOENT) {
                                blocksize = zfs_prop_default_numeric(
                                    ZFS_PROP_VOLBLOCKSIZE);
                        } else {
                                nvlist_free(props);
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "missing volume block size"));
                                return (zfs_error(hdl, EZFS_BADPROP, errbuf));
                        }
                }

                if (size == 0) {
                        nvlist_free(props);
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "volume size cannot be zero"));
                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));
                }

                if (size % blocksize != 0) {
                        nvlist_free(props);
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "volume size must be a multiple of volume block "
                            "size"));
                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));
                }
        }

        if (props &&
            zcmd_write_src_nvlist(hdl, &zc, props, NULL) != 0)
                return (-1);
        nvlist_free(props);

        /* create the dataset */
        ret = ioctl(hdl->libzfs_fd, ZFS_IOC_CREATE, &zc);

        if (ret == 0 && type == ZFS_TYPE_VOLUME) {
                ret = zvol_create_link(hdl, path);
                if (ret) {
                        (void) zfs_standard_error(hdl, errno,
                            dgettext(TEXT_DOMAIN,
                            "Volume successfully created, but device links "
                            "were not created"));
                        zcmd_free_nvlists(&zc);
                        return (-1);
                }
        }

        zcmd_free_nvlists(&zc);

        /* check for failure */
        if (ret != 0) {
                char parent[ZFS_MAXNAMELEN];
                (void) parent_name(path, parent, sizeof (parent));

                switch (errno) {
                case ENOENT:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "no such parent '%s'"), parent);
                        return (zfs_error(hdl, EZFS_NOENT, errbuf));

                case EINVAL:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "parent '%s' is not a filesystem"), parent);
                        return (zfs_error(hdl, EZFS_BADTYPE, errbuf));

                case EDOM:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "volume block size must be power of 2 from "
                            "%u to %uk"),
                            (uint_t)SPA_MINBLOCKSIZE,
                            (uint_t)SPA_MAXBLOCKSIZE >> 10);

                        return (zfs_error(hdl, EZFS_BADPROP, errbuf));

#ifdef _ILP32
                case EOVERFLOW:
                        /*
                         * This platform can't address a volume this big.
                         */
                        if (type == ZFS_TYPE_VOLUME)
                                return (zfs_error(hdl, EZFS_VOLTOOBIG,
                                    errbuf));
#endif
                        /* FALLTHROUGH */
                default:
                        return (zfs_standard_error(hdl, errno, errbuf));
                }
        }

        return (0);
}

/*
 * Destroys the given dataset.  The caller must make sure that the filesystem
 * isn't mounted, and that there are no active dependents.
 */
int
zfs_destroy(zfs_handle_t *zhp)
{
        zfs_cmd_t zc = { 0 };

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

        if (ZFS_IS_VOLUME(zhp)) {
                /*
                 * Unconditionally unshare this zvol ignoring failure as it
                 * indicates only that the volume wasn't shared initially.
                 */
                (void) zfs_unshare_iscsi(zhp);

                if (zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
                        return (-1);

                zc.zc_objset_type = DMU_OST_ZVOL;
        } else {
                zc.zc_objset_type = DMU_OST_ZFS;
        }

        if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc) != 0) {
                return (zfs_standard_error_fmt(zhp->zfs_hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
                    zhp->zfs_name));
        }

        remove_mountpoint(zhp);

        return (0);
}

struct destroydata {
        char *snapname;
        boolean_t gotone;
        boolean_t closezhp;
};

static int
zfs_remove_link_cb(zfs_handle_t *zhp, void *arg)
{
        struct destroydata *dd = arg;
        zfs_handle_t *szhp;
        char name[ZFS_MAXNAMELEN];
        boolean_t closezhp = dd->closezhp;
        int rv;

        (void) strlcpy(name, zhp->zfs_name, sizeof (name));
        (void) strlcat(name, "@", sizeof (name));
        (void) strlcat(name, dd->snapname, sizeof (name));

        szhp = make_dataset_handle(zhp->zfs_hdl, name);
        if (szhp) {
                dd->gotone = B_TRUE;
                zfs_close(szhp);
        }

        if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
                (void) zvol_remove_link(zhp->zfs_hdl, name);
                /*
                 * NB: this is simply a best-effort.  We don't want to
                 * return an error, because then we wouldn't visit all
                 * the volumes.
                 */
        }

        dd->closezhp = B_TRUE;
        rv = zfs_iter_filesystems(zhp, zfs_remove_link_cb, arg);
        if (closezhp)
                zfs_close(zhp);
        return (rv);
}

/*
 * Destroys all snapshots with the given name in zhp & descendants.
 */
int
zfs_destroy_snaps(zfs_handle_t *zhp, char *snapname)
{
        zfs_cmd_t zc = { 0 };
        int ret;
        struct destroydata dd = { 0 };

        dd.snapname = snapname;
        (void) zfs_remove_link_cb(zhp, &dd);

        if (!dd.gotone) {
                return (zfs_standard_error_fmt(zhp->zfs_hdl, ENOENT,
                    dgettext(TEXT_DOMAIN, "cannot destroy '%s@%s'"),
                    zhp->zfs_name, snapname));
        }

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));

        ret = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DESTROY_SNAPS, &zc);
        if (ret != 0) {
                char errbuf[1024];

                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot destroy '%s@%s'"), zc.zc_name, snapname);

                switch (errno) {
                case EEXIST:
                        zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
                            "snapshot is cloned"));
                        return (zfs_error(zhp->zfs_hdl, EZFS_EXISTS, errbuf));

                default:
                        return (zfs_standard_error(zhp->zfs_hdl, errno,
                            errbuf));
                }
        }

        return (0);
}

/*
 * Clones the given dataset.  The target must be of the same type as the source.
 */
int
zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
{
        zfs_cmd_t zc = { 0 };
        char parent[ZFS_MAXNAMELEN];
        int ret;
        char errbuf[1024];
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        zfs_type_t type;
        uint64_t zoned;

        assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot create '%s'"), target);

        /* validate the target name */
        if (!zfs_validate_name(hdl, target, ZFS_TYPE_FILESYSTEM))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        /* validate parents exist */
        if (check_parents(hdl, target, &zoned) != 0)
                return (-1);

        (void) parent_name(target, parent, sizeof (parent));

        /* do the clone */
        if (ZFS_IS_VOLUME(zhp)) {
                zc.zc_objset_type = DMU_OST_ZVOL;
                type = ZFS_TYPE_VOLUME;
        } else {
                zc.zc_objset_type = DMU_OST_ZFS;
                type = ZFS_TYPE_FILESYSTEM;
        }

        if (props) {
                if ((props = zfs_validate_properties(hdl, type, NULL, props,
                    zoned, zhp, errbuf)) == NULL)
                        return (-1);

                if (zcmd_write_src_nvlist(hdl, &zc, props, NULL) != 0) {
                        nvlist_free(props);
                        return (-1);
                }

                nvlist_free(props);
        }

        (void) strlcpy(zc.zc_name, target, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_value, zhp->zfs_name, sizeof (zc.zc_value));
        ret = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_CREATE, &zc);

        zcmd_free_nvlists(&zc);

        if (ret != 0) {
                switch (errno) {

                case ENOENT:
                        /*
                         * The parent doesn't exist.  We should have caught this
                         * above, but there may a race condition that has since
                         * destroyed the parent.
                         *
                         * At this point, we don't know whether it's the source
                         * that doesn't exist anymore, or whether the target
                         * dataset doesn't exist.
                         */
                        zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
                            "no such parent '%s'"), parent);
                        return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));

                case EXDEV:
                        zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
                            "source and target pools differ"));
                        return (zfs_error(zhp->zfs_hdl, EZFS_CROSSTARGET,
                            errbuf));

                default:
                        return (zfs_standard_error(zhp->zfs_hdl, errno,
                            errbuf));
                }
        } else if (ZFS_IS_VOLUME(zhp)) {
                ret = zvol_create_link(zhp->zfs_hdl, target);
        }

        return (ret);
}

typedef struct promote_data {
        char cb_mountpoint[MAXPATHLEN];
        const char *cb_target;
        const char *cb_errbuf;
        uint64_t cb_pivot_txg;
} promote_data_t;

static int
promote_snap_cb(zfs_handle_t *zhp, void *data)
{
        promote_data_t *pd = data;
        zfs_handle_t *szhp;
        char snapname[MAXPATHLEN];
        int rv = 0;

        /* We don't care about snapshots after the pivot point */
        if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) > pd->cb_pivot_txg) {
                zfs_close(zhp);
                return (0);
        }

        /* Remove the device link if it's a zvol. */
        if (ZFS_IS_VOLUME(zhp))
                (void) zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name);

        /* Check for conflicting names */
        (void) strlcpy(snapname, pd->cb_target, sizeof (snapname));
        (void) strlcat(snapname, strchr(zhp->zfs_name, '@'), sizeof (snapname));
        szhp = make_dataset_handle(zhp->zfs_hdl, snapname);
        if (szhp != NULL) {
                zfs_close(szhp);
                zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
                    "snapshot name '%s' from origin \n"
                    "conflicts with '%s' from target"),
                    zhp->zfs_name, snapname);
                rv = zfs_error(zhp->zfs_hdl, EZFS_EXISTS, pd->cb_errbuf);
        }
        zfs_close(zhp);
        return (rv);
}

static int
promote_snap_done_cb(zfs_handle_t *zhp, void *data)
{
        promote_data_t *pd = data;

        /* We don't care about snapshots after the pivot point */
        if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) <= pd->cb_pivot_txg) {
                /* Create the device link if it's a zvol. */
                if (ZFS_IS_VOLUME(zhp))
                        (void) zvol_create_link(zhp->zfs_hdl, zhp->zfs_name);
        }

        zfs_close(zhp);
        return (0);
}

/*
 * Promotes the given clone fs to be the clone parent.
 */
int
zfs_promote(zfs_handle_t *zhp)
{
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        zfs_cmd_t zc = { 0 };
        char parent[MAXPATHLEN];
        char *cp;
        int ret;
        zfs_handle_t *pzhp;
        promote_data_t pd;
        char errbuf[1024];

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot promote '%s'"), zhp->zfs_name);

        if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "snapshots can not be promoted"));
                return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
        }

        (void) strlcpy(parent, zhp->zfs_dmustats.dds_clone_of, sizeof (parent));
        if (parent[0] == '\0') {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "not a cloned filesystem"));
                return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
        }
        cp = strchr(parent, '@');
        *cp = '\0';

        /* Walk the snapshots we will be moving */
        pzhp = zfs_open(hdl, zhp->zfs_dmustats.dds_clone_of, ZFS_TYPE_SNAPSHOT);
        if (pzhp == NULL)
                return (-1);
        pd.cb_pivot_txg = zfs_prop_get_int(pzhp, ZFS_PROP_CREATETXG);
        zfs_close(pzhp);
        pd.cb_target = zhp->zfs_name;
        pd.cb_errbuf = errbuf;
        pzhp = zfs_open(hdl, parent, ZFS_TYPE_ANY);
        if (pzhp == NULL)
                return (-1);
        (void) zfs_prop_get(pzhp, ZFS_PROP_MOUNTPOINT, pd.cb_mountpoint,
            sizeof (pd.cb_mountpoint), NULL, NULL, 0, FALSE);
        ret = zfs_iter_snapshots(pzhp, promote_snap_cb, &pd);
        if (ret != 0) {
                zfs_close(pzhp);
                return (-1);
        }

        /* issue the ioctl */
        (void) strlcpy(zc.zc_value, zhp->zfs_dmustats.dds_clone_of,
            sizeof (zc.zc_value));
        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        ret = ioctl(hdl->libzfs_fd, ZFS_IOC_PROMOTE, &zc);

        if (ret != 0) {
                int save_errno = errno;

                (void) zfs_iter_snapshots(pzhp, promote_snap_done_cb, &pd);
                zfs_close(pzhp);

                switch (save_errno) {
                case EEXIST:
                        /*
                         * There is a conflicting snapshot name.  We
                         * should have caught this above, but they could
                         * have renamed something in the mean time.
                         */
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "conflicting snapshot name from parent '%s'"),
                            parent);
                        return (zfs_error(hdl, EZFS_EXISTS, errbuf));

                default:
                        return (zfs_standard_error(hdl, save_errno, errbuf));
                }
        } else {
                (void) zfs_iter_snapshots(zhp, promote_snap_done_cb, &pd);
        }

        zfs_close(pzhp);
        return (ret);
}

struct createdata {
        const char *cd_snapname;
        int cd_ifexists;
};

static int
zfs_create_link_cb(zfs_handle_t *zhp, void *arg)
{
        struct createdata *cd = arg;
        int ret;

        if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
                char name[MAXPATHLEN];

                (void) strlcpy(name, zhp->zfs_name, sizeof (name));
                (void) strlcat(name, "@", sizeof (name));
                (void) strlcat(name, cd->cd_snapname, sizeof (name));
                (void) zvol_create_link_common(zhp->zfs_hdl, name,
                    cd->cd_ifexists);
                /*
                 * NB: this is simply a best-effort.  We don't want to
                 * return an error, because then we wouldn't visit all
                 * the volumes.
                 */
        }

        ret = zfs_iter_filesystems(zhp, zfs_create_link_cb, cd);

        zfs_close(zhp);

        return (ret);
}

/*
 * Takes a snapshot of the given dataset.
 */
int
zfs_snapshot(libzfs_handle_t *hdl, const char *path, boolean_t recursive)
{
        const char *delim;
        char *parent;
        zfs_handle_t *zhp;
        zfs_cmd_t zc = { 0 };
        int ret;
        char errbuf[1024];

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot snapshot '%s'"), path);

        /* validate the target name */
        if (!zfs_validate_name(hdl, path, ZFS_TYPE_SNAPSHOT))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        /* make sure the parent exists and is of the appropriate type */
        delim = strchr(path, '@');
        if ((parent = zfs_alloc(hdl, delim - path + 1)) == NULL)
                return (-1);
        (void) strncpy(parent, path, delim - path);
        parent[delim - path] = '\0';

        if ((zhp = zfs_open(hdl, parent, ZFS_TYPE_FILESYSTEM |
            ZFS_TYPE_VOLUME)) == NULL) {
                free(parent);
                return (-1);
        }

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_value, delim+1, sizeof (zc.zc_value));
        zc.zc_cookie = recursive;
        ret = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SNAPSHOT, &zc);

        /*
         * if it was recursive, the one that actually failed will be in
         * zc.zc_name.
         */
        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot create snapshot '%s@%s'"), zc.zc_name, zc.zc_value);
        if (ret == 0 && recursive) {
                struct createdata cd;

                cd.cd_snapname = delim + 1;
                cd.cd_ifexists = B_FALSE;
                (void) zfs_iter_filesystems(zhp, zfs_create_link_cb, &cd);
        }
        if (ret == 0 && zhp->zfs_type == ZFS_TYPE_VOLUME) {
                ret = zvol_create_link(zhp->zfs_hdl, path);
                if (ret != 0) {
                        (void) ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_DESTROY,
                            &zc);
                }
        }

        if (ret != 0)
                (void) zfs_standard_error(hdl, errno, errbuf);

        free(parent);
        zfs_close(zhp);

        return (ret);
}

/*
 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
 * NULL) to the file descriptor specified by outfd.
 */
int
zfs_send(zfs_handle_t *zhp, const char *fromsnap, int outfd)
{
        zfs_cmd_t zc = { 0 };
        char errbuf[1024];
        libzfs_handle_t *hdl = zhp->zfs_hdl;

        assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        if (fromsnap)
                (void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_name));
        zc.zc_cookie = outfd;

        if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SENDBACKUP, &zc) != 0) {
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot send '%s'"), zhp->zfs_name);

                switch (errno) {

                case EXDEV:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "not an earlier snapshot from the same fs"));
                        return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));

                case EDQUOT:
                case EFBIG:
                case EIO:
                case ENOLINK:
                case ENOSPC:
                case ENXIO:
                case EPIPE:
                case ERANGE:
                case EFAULT:
                case EROFS:
                        zfs_error_aux(hdl, strerror(errno));
                        return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));

                default:
                        return (zfs_standard_error(hdl, errno, errbuf));
                }
        }

        return (0);
}

/*
 * Create ancestors of 'target', but not target itself, and not
 * ancestors whose names are shorter than prefixlen.  Die if
 * prefixlen-ancestor does not exist.
 */
static int
create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
{
        zfs_handle_t *h;
        char *cp;

        /* make sure prefix exists */
        cp = strchr(target + prefixlen, '/');
        *cp = '\0';
        h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
        *cp = '/';
        if (h == NULL)
                return (-1);
        zfs_close(h);

        /*
         * Attempt to create, mount, and share any ancestor filesystems,
         * up to the prefixlen-long one.
         */
        for (cp = target + prefixlen + 1;
            cp = strchr(cp, '/'); *cp = '/', cp++) {
                const char *opname;

                *cp = '\0';

                h = make_dataset_handle(hdl, target);
                if (h) {
                        /* it already exists, nothing to do here */
                        zfs_close(h);
                        continue;
                }

                opname = dgettext(TEXT_DOMAIN, "create");
                if (zfs_create(hdl, target, ZFS_TYPE_FILESYSTEM,
                    NULL) != 0)
                        goto ancestorerr;

                opname = dgettext(TEXT_DOMAIN, "open");
                h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
                if (h == NULL)
                        goto ancestorerr;

                opname = dgettext(TEXT_DOMAIN, "mount");
                if (zfs_mount(h, NULL, 0) != 0)
                        goto ancestorerr;

                opname = dgettext(TEXT_DOMAIN, "share");
                if (zfs_share(h) != 0)
                        goto ancestorerr;

                zfs_close(h);

                continue;
ancestorerr:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "failed to %s ancestor '%s'"), opname, target);
                return (-1);
        }

        return (0);
}

/*
 * Restores a backup of tosnap from the file descriptor specified by infd.
 */
int
zfs_receive(libzfs_handle_t *hdl, const char *tosnap, int isprefix,
    int verbose, int dryrun, boolean_t force, int infd)
{
        zfs_cmd_t zc = { 0 };
        time_t begin_time;
        int ioctl_err, err, bytes, size, choplen;
        char *cp;
        dmu_replay_record_t drr;
        struct drr_begin *drrb = &zc.zc_begin_record;
        char errbuf[1024];
        prop_changelist_t *clp;
        char chopprefix[ZFS_MAXNAMELEN];

        begin_time = time(NULL);

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot receive"));

        /* read in the BEGIN record */
        cp = (char *)&drr;
        bytes = 0;
        do {
                size = read(infd, cp, sizeof (drr) - bytes);
                cp += size;
                bytes += size;
        } while (size > 0);

        if (size < 0 || bytes != sizeof (drr)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
                    "stream (failed to read first record)"));
                return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
        }

        zc.zc_begin_record = drr.drr_u.drr_begin;

        if (drrb->drr_magic != DMU_BACKUP_MAGIC &&
            drrb->drr_magic != BSWAP_64(DMU_BACKUP_MAGIC)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
                    "stream (bad magic number)"));
                return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
        }

        if (drrb->drr_version != DMU_BACKUP_VERSION &&
            drrb->drr_version != BSWAP_64(DMU_BACKUP_VERSION)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "only version "
                    "0x%llx is supported (stream is version 0x%llx)"),
                    DMU_BACKUP_VERSION, drrb->drr_version);
                return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
        }

        if (strchr(drr.drr_u.drr_begin.drr_toname, '@') == NULL) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
                    "stream (bad snapshot name)"));
                return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
        }
        /*
         * Determine how much of the snapshot name stored in the stream
         * we are going to tack on to the name they specified on the
         * command line, and how much we are going to chop off.
         *
         * If they specified a snapshot, chop the entire name stored in
         * the stream.
         */
        (void) strcpy(chopprefix, drr.drr_u.drr_begin.drr_toname);
        if (isprefix) {
                /*
                 * They specified a fs with -d, we want to tack on
                 * everything but the pool name stored in the stream
                 */
                if (strchr(tosnap, '@')) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
                            "argument - snapshot not allowed with -d"));
                        return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
                }
                cp = strchr(chopprefix, '/');
                if (cp == NULL)
                        cp = strchr(chopprefix, '@');
                *cp = '\0';
        } else if (strchr(tosnap, '@') == NULL) {
                /*
                 * If they specified a filesystem without -d, we want to
                 * tack on everything after the fs specified in the
                 * first name from the stream.
                 */
                cp = strchr(chopprefix, '@');
                *cp = '\0';
        }
        choplen = strlen(chopprefix);

        /*
         * Determine name of destination snapshot, store in zc_value.
         */
        (void) strcpy(zc.zc_value, tosnap);
        (void) strncat(zc.zc_value, drr.drr_u.drr_begin.drr_toname+choplen,
            sizeof (zc.zc_value));
        if (!zfs_validate_name(hdl, zc.zc_value, ZFS_TYPE_SNAPSHOT))
                return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));

        (void) strcpy(zc.zc_name, zc.zc_value);
        if (drrb->drr_fromguid) {
                /* incremental backup stream */
                zfs_handle_t *h;

                /* do the recvbackup ioctl to the containing fs */
                *strchr(zc.zc_name, '@') = '\0';

                /* make sure destination fs exists */
                h = zfs_open(hdl, zc.zc_name,
                    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
                if (h == NULL)
                        return (-1);
                if (!dryrun) {
                        /*
                         * We need to unmount all the dependents of the dataset
                         * and the dataset itself. If it's a volume
                         * then remove device link.
                         */
                        if (h->zfs_type == ZFS_TYPE_FILESYSTEM) {
                                clp = changelist_gather(h, ZFS_PROP_NAME, 0);
                                if (clp == NULL)
                                        return (-1);
                                if (changelist_prefix(clp) != 0) {
                                        changelist_free(clp);
                                        return (-1);
                                }
                        } else {
                                (void) zvol_remove_link(hdl, h->zfs_name);
                        }
                }
                zfs_close(h);
        } else {
                /* full backup stream */

                /* Make sure destination fs does not exist */
                *strchr(zc.zc_name, '@') = '\0';
                if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) == 0) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "destination '%s' exists"), zc.zc_name);
                        return (zfs_error(hdl, EZFS_EXISTS, errbuf));
                }

                if (strchr(zc.zc_name, '/') == NULL) {
                        /*
                         * they're trying to do a recv into a
                         * nonexistant topmost filesystem.
                         */
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "destination does not exist"), zc.zc_name);
                        return (zfs_error(hdl, EZFS_EXISTS, errbuf));
                }

                /* Do the recvbackup ioctl to the fs's parent. */
                *strrchr(zc.zc_name, '/') = '\0';

                if (isprefix && (err = create_parents(hdl,
                    zc.zc_value, strlen(tosnap))) != 0) {
                        return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
                }

        }

        zc.zc_cookie = infd;
        zc.zc_guid = force;
        if (verbose) {
                (void) printf("%s %s stream of %s into %s\n",
                    dryrun ? "would receive" : "receiving",
                    drrb->drr_fromguid ? "incremental" : "full",
                    drr.drr_u.drr_begin.drr_toname,
                    zc.zc_value);
                (void) fflush(stdout);
        }
        if (dryrun)
                return (0);
        err = ioctl_err = ioctl(hdl->libzfs_fd, ZFS_IOC_RECVBACKUP, &zc);
        if (ioctl_err != 0) {
                switch (errno) {
                case ENODEV:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "most recent snapshot does not match incremental "
                            "source"));
                        (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
                        break;
                case ETXTBSY:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "destination has been modified since most recent "
                            "snapshot"));
                        (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
                        break;
                case EEXIST:
                        if (drrb->drr_fromguid == 0) {
                                /* it's the containing fs that exists */
                                cp = strchr(zc.zc_value, '@');
                                *cp = '\0';
                        }
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "destination already exists"));
                        (void) zfs_error_fmt(hdl, EZFS_EXISTS,
                            dgettext(TEXT_DOMAIN, "cannot restore to %s"),
                            zc.zc_value);
                        break;
                case EINVAL:
                        (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
                        break;
                case ECKSUM:
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "invalid stream (checksum mismatch)"));
                        (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
                        break;
                default:
                        (void) zfs_standard_error(hdl, errno, errbuf);
                }
        }

        /*
         * Mount or recreate the /dev links for the target filesystem
         * (if created, or if we tore them down to do an incremental
         * restore), and the /dev links for the new snapshot (if
         * created). Also mount any children of the target filesystem
         * if we did an incremental receive.
         */
        cp = strchr(zc.zc_value, '@');
        if (cp && (ioctl_err == 0 || drrb->drr_fromguid)) {
                zfs_handle_t *h;

                *cp = '\0';
                h = zfs_open(hdl, zc.zc_value,
                    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
                *cp = '@';
                if (h) {
                        if (h->zfs_type == ZFS_TYPE_VOLUME) {
                                err = zvol_create_link(hdl, h->zfs_name);
                                if (err == 0 && ioctl_err == 0)
                                        err = zvol_create_link(hdl,
                                            zc.zc_value);
                        } else {
                                if (drrb->drr_fromguid) {
                                        err = changelist_postfix(clp);
                                        changelist_free(clp);
                                } else {
                                        err = zfs_mount(h, NULL, 0);
                                }
                        }
                zfs_close(h);
                }
        }

        if (err || ioctl_err)
                return (-1);

        if (verbose) {
                char buf1[64];
                char buf2[64];
                uint64_t bytes = zc.zc_cookie;
                time_t delta = time(NULL) - begin_time;
                if (delta == 0)
                        delta = 1;
                zfs_nicenum(bytes, buf1, sizeof (buf1));
                zfs_nicenum(bytes/delta, buf2, sizeof (buf1));

                (void) printf("received %sb stream in %lu seconds (%sb/sec)\n",
                    buf1, delta, buf2);
        }

        return (0);
}

/*
 * Destroy any more recent snapshots.  We invoke this callback on any dependents
 * of the snapshot first.  If the 'cb_dependent' member is non-zero, then this
 * is a dependent and we should just destroy it without checking the transaction
 * group.
 */
typedef struct rollback_data {
        const char      *cb_target;             /* the snapshot */
        uint64_t        cb_create;              /* creation time reference */
        prop_changelist_t *cb_clp;              /* changelist pointer */
        int             cb_error;
        boolean_t       cb_dependent;
} rollback_data_t;

static int
rollback_destroy(zfs_handle_t *zhp, void *data)
{
        rollback_data_t *cbp = data;

        if (!cbp->cb_dependent) {
                if (strcmp(zhp->zfs_name, cbp->cb_target) != 0 &&
                    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
                    zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
                    cbp->cb_create) {

                        cbp->cb_dependent = B_TRUE;
                        if (zfs_iter_dependents(zhp, B_FALSE, rollback_destroy,
                            cbp) != 0)
                                cbp->cb_error = 1;
                        cbp->cb_dependent = B_FALSE;

                        if (zfs_destroy(zhp) != 0)
                                cbp->cb_error = 1;
                        else
                                changelist_remove(zhp, cbp->cb_clp);
                }
        } else {
                if (zfs_destroy(zhp) != 0)
                        cbp->cb_error = 1;
                else
                        changelist_remove(zhp, cbp->cb_clp);
        }

        zfs_close(zhp);
        return (0);
}

/*
 * Rollback the dataset to its latest snapshot.
 */
static int
do_rollback(zfs_handle_t *zhp)
{
        int ret;
        zfs_cmd_t zc = { 0 };

        assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
            zhp->zfs_type == ZFS_TYPE_VOLUME);

        if (zhp->zfs_type == ZFS_TYPE_VOLUME &&
            zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
                return (-1);

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

        if (ZFS_IS_VOLUME(zhp))
                zc.zc_objset_type = DMU_OST_ZVOL;
        else
                zc.zc_objset_type = DMU_OST_ZFS;

        /*
         * We rely on the consumer to verify that there are no newer snapshots
         * for the given dataset.  Given these constraints, we can simply pass
         * the name on to the ioctl() call.  There is still an unlikely race
         * condition where the user has taken a snapshot since we verified that
         * this was the most recent.
         */
        if ((ret = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_ROLLBACK,
            &zc)) != 0) {
                (void) zfs_standard_error_fmt(zhp->zfs_hdl, errno,
                    dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
                    zhp->zfs_name);
        } else if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
                ret = zvol_create_link(zhp->zfs_hdl, zhp->zfs_name);
        }

        return (ret);
}

/*
 * Given a dataset, rollback to a specific snapshot, discarding any
 * data changes since then and making it the active dataset.
 *
 * Any snapshots more recent than the target are destroyed, along with
 * their dependents.
 */
int
zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, int flag)
{
        int ret;
        rollback_data_t cb = { 0 };
        prop_changelist_t *clp;

        /*
         * Unmount all dependendents of the dataset and the dataset itself.
         * The list we need to gather is the same as for doing rename
         */
        clp = changelist_gather(zhp, ZFS_PROP_NAME, flag ? MS_FORCE: 0);
        if (clp == NULL)
                return (-1);

        if ((ret = changelist_prefix(clp)) != 0)
                goto out;

        /*
         * Destroy all recent snapshots and its dependends.
         */
        cb.cb_target = snap->zfs_name;
        cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
        cb.cb_clp = clp;
        (void) zfs_iter_children(zhp, rollback_destroy, &cb);

        if ((ret = cb.cb_error) != 0) {
                (void) changelist_postfix(clp);
                goto out;
        }

        /*
         * Now that we have verified that the snapshot is the latest,
         * rollback to the given snapshot.
         */
        ret = do_rollback(zhp);

        if (ret != 0) {
                (void) changelist_postfix(clp);
                goto out;
        }

        /*
         * We only want to re-mount the filesystem if it was mounted in the
         * first place.
         */
        ret = changelist_postfix(clp);

out:
        changelist_free(clp);
        return (ret);
}

/*
 * Iterate over all dependents for a given dataset.  This includes both
 * hierarchical dependents (children) and data dependents (snapshots and
 * clones).  The bulk of the processing occurs in get_dependents() in
 * libzfs_graph.c.
 */
int
zfs_iter_dependents(zfs_handle_t *zhp, boolean_t allowrecursion,
    zfs_iter_f func, void *data)
{
        char **dependents;
        size_t count;
        int i;
        zfs_handle_t *child;
        int ret = 0;

        if (get_dependents(zhp->zfs_hdl, allowrecursion, zhp->zfs_name,
            &dependents, &count) != 0)
                return (-1);

        for (i = 0; i < count; i++) {
                if ((child = make_dataset_handle(zhp->zfs_hdl,
                    dependents[i])) == NULL)
                        continue;

                if ((ret = func(child, data)) != 0)
                        break;
        }

        for (i = 0; i < count; i++)
                free(dependents[i]);
        free(dependents);

        return (ret);
}

/*
 * Renames the given dataset.
 */
int
zfs_rename(zfs_handle_t *zhp, const char *target, int recursive)
{
        int ret;
        zfs_cmd_t zc = { 0 };
        char *delim;
        prop_changelist_t *cl = NULL;
        zfs_handle_t *zhrp = NULL;
        char *parentname = NULL;
        char parent[ZFS_MAXNAMELEN];
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        char errbuf[1024];

        /* if we have the same exact name, just return success */
        if (strcmp(zhp->zfs_name, target) == 0)
                return (0);

        (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
            "cannot rename to '%s'"), target);

        /*
         * Make sure the target name is valid
         */
        if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
                if ((strchr(target, '@') == NULL) ||
                    *target == '@') {
                        /*
                         * Snapshot target name is abbreviated,
                         * reconstruct full dataset name
                         */
                        (void) strlcpy(parent, zhp->zfs_name,
                            sizeof (parent));
                        delim = strchr(parent, '@');
                        if (strchr(target, '@') == NULL)
                                *(++delim) = '\0';
                        else
                                *delim = '\0';
                        (void) strlcat(parent, target, sizeof (parent));
                        target = parent;
                } else {
                        /*
                         * Make sure we're renaming within the same dataset.
                         */
                        delim = strchr(target, '@');
                        if (strncmp(zhp->zfs_name, target, delim - target)
                            != 0 || zhp->zfs_name[delim - target] != '@') {
                                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                                    "snapshots must be part of same "
                                    "dataset"));
                                return (zfs_error(hdl, EZFS_CROSSTARGET,
                                    errbuf));
                        }
                }
                if (!zfs_validate_name(hdl, target, zhp->zfs_type))
                        return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
        } else {
                if (recursive) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "recursive rename must be a snapshot"));
                        return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
                }

                if (!zfs_validate_name(hdl, target, zhp->zfs_type))
                        return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
                uint64_t unused;

                /* validate parents */
                if (check_parents(hdl, target, &unused) != 0)
                        return (-1);

                (void) parent_name(target, parent, sizeof (parent));

                /* make sure we're in the same pool */
                verify((delim = strchr(target, '/')) != NULL);
                if (strncmp(zhp->zfs_name, target, delim - target) != 0 ||
                    zhp->zfs_name[delim - target] != '/') {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "datasets must be within same pool"));
                        return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
                }

                /* new name cannot be a child of the current dataset name */
                if (strncmp(parent, zhp->zfs_name,
                    strlen(zhp->zfs_name)) == 0) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "New dataset name cannot be a descendent of "
                            "current dataset name"));
                        return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
                }
        }

        (void) snprintf(errbuf, sizeof (errbuf),
            dgettext(TEXT_DOMAIN, "cannot rename '%s'"), zhp->zfs_name);

        if (getzoneid() == GLOBAL_ZONEID &&
            zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "dataset is used in a non-global zone"));
                return (zfs_error(hdl, EZFS_ZONED, errbuf));
        }

        if (recursive) {
                struct destroydata dd;

                parentname = strdup(zhp->zfs_name);
                delim = strchr(parentname, '@');
                *delim = '\0';
                zhrp = zfs_open(zhp->zfs_hdl, parentname, ZFS_TYPE_ANY);
                if (zhrp == NULL) {
                        return (-1);
                }

                dd.snapname = delim + 1;
                dd.gotone = B_FALSE;
                dd.closezhp = B_FALSE;

                /* We remove any zvol links prior to renaming them */
                ret = zfs_iter_filesystems(zhrp, zfs_remove_link_cb, &dd);
                if (ret) {
                        goto error;
                }
        } else {
                if ((cl = changelist_gather(zhp, ZFS_PROP_NAME, 0)) == NULL)
                        return (-1);

                if (changelist_haszonedchild(cl)) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "child dataset with inherited mountpoint is used "
                            "in a non-global zone"));
                        (void) zfs_error(hdl, EZFS_ZONED, errbuf);
                        goto error;
                }

                if ((ret = changelist_prefix(cl)) != 0)
                        goto error;
        }

        if (ZFS_IS_VOLUME(zhp))
                zc.zc_objset_type = DMU_OST_ZVOL;
        else
                zc.zc_objset_type = DMU_OST_ZFS;

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        (void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value));

        zc.zc_cookie = recursive;

        if ((ret = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_RENAME, &zc)) != 0) {
                /*
                 * if it was recursive, the one that actually failed will
                 * be in zc.zc_name
                 */
                (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
                    "cannot rename to '%s'"), zc.zc_name);

                if (recursive && errno == EEXIST) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "a child dataset already has a snapshot "
                            "with the new name"));
                        (void) zfs_error(hdl, EZFS_CROSSTARGET, errbuf);
                } else {
                        (void) zfs_standard_error(zhp->zfs_hdl, errno, errbuf);
                }

                /*
                 * On failure, we still want to remount any filesystems that
                 * were previously mounted, so we don't alter the system state.
                 */
                if (recursive) {
                        struct createdata cd;

                        /* only create links for datasets that had existed */
                        cd.cd_snapname = delim + 1;
                        cd.cd_ifexists = B_TRUE;
                        (void) zfs_iter_filesystems(zhrp, zfs_create_link_cb,
                            &cd);
                } else {
                        (void) changelist_postfix(cl);
                }
        } else {
                if (recursive) {
                        struct createdata cd;

                        /* only create links for datasets that had existed */
                        cd.cd_snapname = strchr(target, '@') + 1;
                        cd.cd_ifexists = B_TRUE;
                        ret = zfs_iter_filesystems(zhrp, zfs_create_link_cb,
                            &cd);
                } else {
                        changelist_rename(cl, zfs_get_name(zhp), target);
                        ret = changelist_postfix(cl);
                }
        }

error:
        if (parentname) {
                free(parentname);
        }
        if (zhrp) {
                zfs_close(zhrp);
        }
        if (cl) {
                changelist_free(cl);
        }
        return (ret);
}

/*
 * Given a zvol dataset, issue the ioctl to create the appropriate minor node,
 * poke devfsadm to create the /dev link, and then wait for the link to appear.
 */
int
zvol_create_link(libzfs_handle_t *hdl, const char *dataset)
{
        return (zvol_create_link_common(hdl, dataset, B_FALSE));
}

static int
zvol_create_link_common(libzfs_handle_t *hdl, const char *dataset, int ifexists)
{
        zfs_cmd_t zc = { 0 };
#if 0
        di_devlink_handle_t dhdl;
#endif

        (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));

        /*
         * Issue the appropriate ioctl.
         */
        if (ioctl(hdl->libzfs_fd, ZFS_IOC_CREATE_MINOR, &zc) != 0) {
                switch (errno) {
                case EEXIST:
                        /*
                         * Silently ignore the case where the link already
                         * exists.  This allows 'zfs volinit' to be run multiple
                         * times without errors.
                         */
                        return (0);

                case ENOENT:
                        /*
                         * Dataset does not exist in the kernel.  If we
                         * don't care (see zfs_rename), then ignore the
                         * error quietly.
                         */
                        if (ifexists) {
                                return (0);
                        }

                        /* FALLTHROUGH */

                default:
                        return (zfs_standard_error_fmt(hdl, errno,
                            dgettext(TEXT_DOMAIN, "cannot create device links "
                            "for '%s'"), dataset));
                }
        }

#if 0
        /*
         * Call devfsadm and wait for the links to magically appear.
         */
        if ((dhdl = di_devlink_init(ZFS_DRIVER, DI_MAKE_LINK)) == NULL) {
                zfs_error_aux(hdl, strerror(errno));
                (void) zfs_error_fmt(hdl, EZFS_DEVLINKS,
                    dgettext(TEXT_DOMAIN, "cannot create device links "
                    "for '%s'"), dataset);
                (void) ioctl(hdl->libzfs_fd, ZFS_IOC_REMOVE_MINOR, &zc);
                return (-1);
        } else {
                (void) di_devlink_fini(&dhdl);
        }
#endif

        return (0);
}

/*
 * Remove a minor node for the given zvol and the associated /dev links.
 */
int
zvol_remove_link(libzfs_handle_t *hdl, const char *dataset)
{
        zfs_cmd_t zc = { 0 };

        (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));

        if (ioctl(hdl->libzfs_fd, ZFS_IOC_REMOVE_MINOR, &zc) != 0) {
                switch (errno) {
                case ENXIO:
                        /*
                         * Silently ignore the case where the link no longer
                         * exists, so that 'zfs volfini' can be run multiple
                         * times without errors.
                         */
                        return (0);

                default:
                        return (zfs_standard_error_fmt(hdl, errno,
                            dgettext(TEXT_DOMAIN, "cannot remove device "
                            "links for '%s'"), dataset));
                }
        }

        return (0);
}

nvlist_t *
zfs_get_user_props(zfs_handle_t *zhp)
{
        return (zhp->zfs_user_props);
}

/*
 * Given a comma-separated list of properties, contruct a property list
 * containing both user-defined and native properties.  This function will
 * return a NULL list if 'all' is specified, which can later be expanded on a
 * per-dataset basis by zfs_expand_proplist().
 */
int
zfs_get_proplist_common(libzfs_handle_t *hdl, char *fields,
    zfs_proplist_t **listp, zfs_type_t type)
{
        size_t len;
        char *s, *p;
        char c;
        zfs_prop_t prop;
        zfs_proplist_t *entry;
        zfs_proplist_t **last;

        *listp = NULL;
        last = listp;

        /*
         * If 'all' is specified, return a NULL list.
         */
        if (strcmp(fields, "all") == 0)
                return (0);

        /*
         * If no fields were specified, return an error.
         */
        if (fields[0] == '\0') {
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "no properties specified"));
                return (zfs_error(hdl, EZFS_BADPROP, dgettext(TEXT_DOMAIN,
                    "bad property list")));
        }

        /*
         * It would be nice to use getsubopt() here, but the inclusion of column
         * aliases makes this more effort than it's worth.
         */
        s = fields;
        while (*s != '\0') {
                if ((p = strchr(s, ',')) == NULL) {
                        len = strlen(s);
                        p = s + len;
                } else {
                        len = p - s;
                }

                /*
                 * Check for empty options.
                 */
                if (len == 0) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "empty property name"));
                        return (zfs_error(hdl, EZFS_BADPROP,
                            dgettext(TEXT_DOMAIN, "bad property list")));
                }

                /*
                 * Check all regular property names.
                 */
                c = s[len];
                s[len] = '\0';
                prop = zfs_name_to_prop_common(s, type);

                if (prop != ZFS_PROP_INVAL &&
                    !zfs_prop_valid_for_type(prop, type))
                        prop = ZFS_PROP_INVAL;

                /*
                 * When no property table entry can be found, return failure if
                 * this is a pool property or if this isn't a user-defined
                 * dataset property,
                 */
                if (prop == ZFS_PROP_INVAL &&
                    (type & ZFS_TYPE_POOL || !zfs_prop_user(s))) {
                        zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                            "invalid property '%s'"), s);
                        return (zfs_error(hdl, EZFS_BADPROP,
                            dgettext(TEXT_DOMAIN, "bad property list")));
                }

                if ((entry = zfs_alloc(hdl, sizeof (zfs_proplist_t))) == NULL)
                        return (-1);

                entry->pl_prop = prop;
                if (prop == ZFS_PROP_INVAL) {
                        if ((entry->pl_user_prop =
                            zfs_strdup(hdl, s)) == NULL) {
                                free(entry);
                                return (-1);
                        }
                        entry->pl_width = strlen(s);
                } else {
                        entry->pl_width = zfs_prop_width(prop,
                            &entry->pl_fixed);
                }

                *last = entry;
                last = &entry->pl_next;

                s = p;
                if (c == ',')
                        s++;
        }

        return (0);
}

int
zfs_get_proplist(libzfs_handle_t *hdl, char *fields, zfs_proplist_t **listp)
{
        return (zfs_get_proplist_common(hdl, fields, listp, ZFS_TYPE_ANY));
}

void
zfs_free_proplist(zfs_proplist_t *pl)
{
        zfs_proplist_t *next;

        while (pl != NULL) {
                next = pl->pl_next;
                free(pl->pl_user_prop);
                free(pl);
                pl = next;
        }
}

typedef struct expand_data {
        zfs_proplist_t  **last;
        libzfs_handle_t *hdl;
} expand_data_t;

static zfs_prop_t
zfs_expand_proplist_cb(zfs_prop_t prop, void *cb)
{
        zfs_proplist_t *entry;
        expand_data_t *edp = cb;

        if ((entry = zfs_alloc(edp->hdl, sizeof (zfs_proplist_t))) == NULL)
                return (ZFS_PROP_INVAL);

        entry->pl_prop = prop;
        entry->pl_width = zfs_prop_width(prop, &entry->pl_fixed);
        entry->pl_all = B_TRUE;

        *(edp->last) = entry;
        edp->last = &entry->pl_next;

        return (ZFS_PROP_CONT);
}

int
zfs_expand_proplist_common(libzfs_handle_t *hdl, zfs_proplist_t **plp,
        zfs_type_t type)
{
        zfs_proplist_t *entry;
        zfs_proplist_t **last;
        expand_data_t exp;

        if (*plp == NULL) {
                /*
                 * If this is the very first time we've been called for an 'all'
                 * specification, expand the list to include all native
                 * properties.
                 */
                last = plp;

                exp.last = last;
                exp.hdl = hdl;

                if (zfs_prop_iter_common(zfs_expand_proplist_cb, &exp, type,
                    B_FALSE) == ZFS_PROP_INVAL)
                        return (-1);

                /*
                 * Add 'name' to the beginning of the list, which is handled
                 * specially.
                 */
                if ((entry = zfs_alloc(hdl,
                    sizeof (zfs_proplist_t))) == NULL)
                        return (-1);

                entry->pl_prop = ZFS_PROP_NAME;
                entry->pl_width = zfs_prop_width(ZFS_PROP_NAME,
                    &entry->pl_fixed);
                entry->pl_all = B_TRUE;
                entry->pl_next = *plp;
                *plp = entry;
        }
        return (0);
}

/*
 * This function is used by 'zfs list' to determine the exact set of columns to
 * display, and their maximum widths.  This does two main things:
 *
 *      - If this is a list of all properties, then expand the list to include
 *        all native properties, and set a flag so that for each dataset we look
 *        for new unique user properties and add them to the list.
 *
 *      - For non fixed-width properties, keep track of the maximum width seen
 *        so that we can size the column appropriately.
 */
int
zfs_expand_proplist(zfs_handle_t *zhp, zfs_proplist_t **plp)
{
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        zfs_proplist_t *entry;
        zfs_proplist_t **last, **start;
        nvlist_t *userprops, *propval;
        nvpair_t *elem;
        char *strval;
        char buf[ZFS_MAXPROPLEN];

        if (zfs_expand_proplist_common(hdl, plp, ZFS_TYPE_ANY) != 0)
                return (-1);

        userprops = zfs_get_user_props(zhp);

        entry = *plp;
        if (entry->pl_all && nvlist_next_nvpair(userprops, NULL) != NULL) {
                /*
                 * Go through and add any user properties as necessary.  We
                 * start by incrementing our list pointer to the first
                 * non-native property.
                 */
                start = plp;
                while (*start != NULL) {
                        if ((*start)->pl_prop == ZFS_PROP_INVAL)
                                break;
                        start = &(*start)->pl_next;
                }

                elem = NULL;
                while ((elem = nvlist_next_nvpair(userprops, elem)) != NULL) {
                        /*
                         * See if we've already found this property in our list.
                         */
                        for (last = start; *last != NULL;
                            last = &(*last)->pl_next) {
                                if (strcmp((*last)->pl_user_prop,
                                    nvpair_name(elem)) == 0)
                                        break;
                        }

                        if (*last == NULL) {
                                if ((entry = zfs_alloc(hdl,
                                    sizeof (zfs_proplist_t))) == NULL ||
                                    ((entry->pl_user_prop = zfs_strdup(hdl,
                                    nvpair_name(elem)))) == NULL) {
                                        free(entry);
                                        return (-1);
                                }

                                entry->pl_prop = ZFS_PROP_INVAL;
                                entry->pl_width = strlen(nvpair_name(elem));
                                entry->pl_all = B_TRUE;
                                *last = entry;
                        }
                }
        }

        /*
         * Now go through and check the width of any non-fixed columns
         */
        for (entry = *plp; entry != NULL; entry = entry->pl_next) {
                if (entry->pl_fixed)
                        continue;

                if (entry->pl_prop != ZFS_PROP_INVAL) {
                        if (zfs_prop_get(zhp, entry->pl_prop,
                            buf, sizeof (buf), NULL, NULL, 0, B_FALSE) == 0) {
                                if (strlen(buf) > entry->pl_width)
                                        entry->pl_width = strlen(buf);
                        }
                } else if (nvlist_lookup_nvlist(userprops,
                    entry->pl_user_prop, &propval)  == 0) {
                        verify(nvlist_lookup_string(propval,
                            ZFS_PROP_VALUE, &strval) == 0);
                        if (strlen(strval) > entry->pl_width)
                                entry->pl_width = strlen(strval);
                }
        }

        return (0);
}

/*
 * Attach/detach the given filesystem to/from the given jail.
 */
int
zfs_jail(zfs_handle_t *zhp, int jailid, int attach)
{
        libzfs_handle_t *hdl = zhp->zfs_hdl;
        zfs_cmd_t zc = { 0 };
        char errbuf[1024];
        int cmd, ret;

        if (attach) {
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot jail '%s'"), zhp->zfs_name);
        } else {
                (void) snprintf(errbuf, sizeof (errbuf),
                    dgettext(TEXT_DOMAIN, "cannot jail '%s'"), zhp->zfs_name);
        }

        switch (zhp->zfs_type) {
        case ZFS_TYPE_VOLUME:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "volumes can not be jailed"));
                return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
        case ZFS_TYPE_SNAPSHOT:
                zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
                    "snapshots can not be jailed"));
                return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
        }
        assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM);

        (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
        zc.zc_objset_type = DMU_OST_ZFS;
        zc.zc_jailid = jailid;

        cmd = attach ? ZFS_IOC_JAIL : ZFS_IOC_UNJAIL;
        if ((ret = ioctl(hdl->libzfs_fd, cmd, &zc)) != 0)
                zfs_standard_error(hdl, errno, errbuf);

        return (ret);
}
Revision:	1930
Committed:	Wed Oct 15 18:56:14 2008 UTC (15 years, 6 months ago) by laffer1
Content type:	text/plain
File size:	96341 byte(s)
Log Message:	Enter ZFS (userland)