common/zfs/zfs_prop.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2011 by Delphix. All rights reserved.
 */

/* Portions Copyright 2010 Robert Milkowski */

#include <sys/zio.h>
#include <sys/spa.h>
#include <sys/u8_textprep.h>
#include <sys/zfs_acl.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_znode.h>

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

#if defined(_KERNEL)
#include <sys/systm.h>
#else
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#endif

static zprop_desc_t zfs_prop_table[ZFS_NUM_PROPS];

/* Note this is indexed by zfs_userquota_prop_t, keep the order the same */
const char *zfs_userquota_prop_prefixes[] = {
	"userused@",
	"userquota@",
	"groupused@",
	"groupquota@"
};

zprop_desc_t *
zfs_prop_get_table(void)
{
	return (zfs_prop_table);
}

void
zfs_prop_init(void)
{
	static zprop_index_t checksum_table[] = {
		{ "on",		ZIO_CHECKSUM_ON },
		{ "off",	ZIO_CHECKSUM_OFF },
		{ "fletcher2",	ZIO_CHECKSUM_FLETCHER_2 },
		{ "fletcher4",	ZIO_CHECKSUM_FLETCHER_4 },
		{ "sha256",	ZIO_CHECKSUM_SHA256 },
		{ NULL }
	};

	static zprop_index_t dedup_table[] = {
		{ "on",		ZIO_CHECKSUM_ON },
		{ "off",	ZIO_CHECKSUM_OFF },
		{ "verify",	ZIO_CHECKSUM_ON | ZIO_CHECKSUM_VERIFY },
		{ "sha256",	ZIO_CHECKSUM_SHA256 },
		{ "sha256,verify",
				ZIO_CHECKSUM_SHA256 | ZIO_CHECKSUM_VERIFY },
		{ NULL }
	};

	static zprop_index_t compress_table[] = {
		{ "on",		ZIO_COMPRESS_ON },
		{ "off",	ZIO_COMPRESS_OFF },
		{ "lzjb",	ZIO_COMPRESS_LZJB },
		{ "gzip",	ZIO_COMPRESS_GZIP_6 },	/* gzip default */
		{ "gzip-1",	ZIO_COMPRESS_GZIP_1 },
		{ "gzip-2",	ZIO_COMPRESS_GZIP_2 },
		{ "gzip-3",	ZIO_COMPRESS_GZIP_3 },
		{ "gzip-4",	ZIO_COMPRESS_GZIP_4 },
		{ "gzip-5",	ZIO_COMPRESS_GZIP_5 },
		{ "gzip-6",	ZIO_COMPRESS_GZIP_6 },
		{ "gzip-7",	ZIO_COMPRESS_GZIP_7 },
		{ "gzip-8",	ZIO_COMPRESS_GZIP_8 },
		{ "gzip-9",	ZIO_COMPRESS_GZIP_9 },
		{ "zle",	ZIO_COMPRESS_ZLE },
		{ NULL }
	};

	static zprop_index_t snapdir_table[] = {
		{ "hidden",	ZFS_SNAPDIR_HIDDEN },
		{ "visible",	ZFS_SNAPDIR_VISIBLE },
		{ NULL }
	};

	static zprop_index_t acl_mode_table[] = {
		{ "discard",	ZFS_ACL_DISCARD },
		{ "groupmask",	ZFS_ACL_GROUPMASK },
		{ "passthrough", ZFS_ACL_PASSTHROUGH },
		{ "restricted", ZFS_ACL_RESTRICTED },
		{ NULL }
	};

	static zprop_index_t acl_inherit_table[] = {
		{ "discard",	ZFS_ACL_DISCARD },
		{ "noallow",	ZFS_ACL_NOALLOW },
		{ "restricted",	ZFS_ACL_RESTRICTED },
		{ "passthrough", ZFS_ACL_PASSTHROUGH },
		{ "secure",	ZFS_ACL_RESTRICTED }, /* bkwrd compatability */
		{ "passthrough-x", ZFS_ACL_PASSTHROUGH_X },
		{ NULL }
	};

	static zprop_index_t case_table[] = {
		{ "sensitive",		ZFS_CASE_SENSITIVE },
		{ "insensitive",	ZFS_CASE_INSENSITIVE },
		{ "mixed",		ZFS_CASE_MIXED },
		{ NULL }
	};

	static zprop_index_t copies_table[] = {
		{ "1",		1 },
		{ "2",		2 },
		{ "3",		3 },
		{ NULL }
	};

	/*
	 * Use the unique flags we have to send to u8_strcmp() and/or
	 * u8_textprep() to represent the various normalization property
	 * values.
	 */
	static zprop_index_t normalize_table[] = {
		{ "none",	0 },
		{ "formD",	U8_TEXTPREP_NFD },
		{ "formKC",	U8_TEXTPREP_NFKC },
		{ "formC",	U8_TEXTPREP_NFC },
		{ "formKD",	U8_TEXTPREP_NFKD },
		{ NULL }
	};

	static zprop_index_t version_table[] = {
		{ "1",		1 },
		{ "2",		2 },
		{ "3",		3 },
		{ "4",		4 },
		{ "5",		5 },
		{ "current",	ZPL_VERSION },
		{ NULL }
	};

	static zprop_index_t boolean_table[] = {
		{ "off",	0 },
		{ "on",		1 },
		{ NULL }
	};

	static zprop_index_t logbias_table[] = {
		{ "latency",	ZFS_LOGBIAS_LATENCY },
		{ "throughput",	ZFS_LOGBIAS_THROUGHPUT },
		{ NULL }
	};

	static zprop_index_t canmount_table[] = {
		{ "off",	ZFS_CANMOUNT_OFF },
		{ "on",		ZFS_CANMOUNT_ON },
		{ "noauto",	ZFS_CANMOUNT_NOAUTO },
		{ NULL }
	};

	static zprop_index_t cache_table[] = {
		{ "none",	ZFS_CACHE_NONE },
		{ "metadata",	ZFS_CACHE_METADATA },
		{ "all",	ZFS_CACHE_ALL },
		{ NULL }
	};

	static zprop_index_t sync_table[] = {
		{ "standard",	ZFS_SYNC_STANDARD },
		{ "always",	ZFS_SYNC_ALWAYS },
		{ "disabled",	ZFS_SYNC_DISABLED },
		{ NULL }
	};

	/* inherit index properties */
	zprop_register_index(ZFS_PROP_SYNC, "sync", ZFS_SYNC_STANDARD,
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "standard | always | disabled", "SYNC",
	    sync_table);
	zprop_register_index(ZFS_PROP_CHECKSUM, "checksum",
	    ZIO_CHECKSUM_DEFAULT, PROP_INHERIT, ZFS_TYPE_FILESYSTEM |
	    ZFS_TYPE_VOLUME,
	    "on | off | fletcher2 | fletcher4 | sha256", "CHECKSUM",
	    checksum_table);
	zprop_register_index(ZFS_PROP_DEDUP, "dedup", ZIO_CHECKSUM_OFF,
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "on | off | verify | sha256[,verify]", "DEDUP",
	    dedup_table);
	zprop_register_index(ZFS_PROP_COMPRESSION, "compression",
	    ZIO_COMPRESS_DEFAULT, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "on | off | lzjb | gzip | gzip-[1-9] | zle", "COMPRESS",
	    compress_table);
	zprop_register_index(ZFS_PROP_SNAPDIR, "snapdir", ZFS_SNAPDIR_HIDDEN,
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM,
	    "hidden | visible", "SNAPDIR", snapdir_table);
	zprop_register_index(ZFS_PROP_ACLMODE, "aclmode", ZFS_ACL_DISCARD,
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM,
	    "discard | groupmask | passthrough | restricted", "ACLMODE",
	    acl_mode_table);
	zprop_register_index(ZFS_PROP_ACLINHERIT, "aclinherit",
	    ZFS_ACL_RESTRICTED, PROP_INHERIT, ZFS_TYPE_FILESYSTEM,
	    "discard | noallow | restricted | passthrough | passthrough-x",
	    "ACLINHERIT", acl_inherit_table);
	zprop_register_index(ZFS_PROP_COPIES, "copies", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "1 | 2 | 3", "COPIES", copies_table);
	zprop_register_index(ZFS_PROP_PRIMARYCACHE, "primarycache",
	    ZFS_CACHE_ALL, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT | ZFS_TYPE_VOLUME,
	    "all | none | metadata", "PRIMARYCACHE", cache_table);
	zprop_register_index(ZFS_PROP_SECONDARYCACHE, "secondarycache",
	    ZFS_CACHE_ALL, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT | ZFS_TYPE_VOLUME,
	    "all | none | metadata", "SECONDARYCACHE", cache_table);
	zprop_register_index(ZFS_PROP_LOGBIAS, "logbias", ZFS_LOGBIAS_LATENCY,
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "latency | throughput", "LOGBIAS", logbias_table);

	/* inherit index (boolean) properties */
	zprop_register_index(ZFS_PROP_ATIME, "atime", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM, "on | off", "ATIME", boolean_table);
	zprop_register_index(ZFS_PROP_DEVICES, "devices", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT, "on | off", "DEVICES",
	    boolean_table);
	zprop_register_index(ZFS_PROP_EXEC, "exec", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT, "on | off", "EXEC",
	    boolean_table);
	zprop_register_index(ZFS_PROP_SETUID, "setuid", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT, "on | off", "SETUID",
	    boolean_table);
	zprop_register_index(ZFS_PROP_READONLY, "readonly", 0, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "on | off", "RDONLY",
	    boolean_table);
	zprop_register_index(ZFS_PROP_ZONED, "jailed", 0, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM, "on | off", "JAILED", boolean_table);
	zprop_register_index(ZFS_PROP_XATTR, "xattr", 1, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT, "on | off", "XATTR",
	    boolean_table);
	zprop_register_index(ZFS_PROP_VSCAN, "vscan", 0, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM, "on | off", "VSCAN",
	    boolean_table);
	zprop_register_index(ZFS_PROP_NBMAND, "nbmand", 0, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT, "on | off", "NBMAND",
	    boolean_table);

	/* default index properties */
	zprop_register_index(ZFS_PROP_VERSION, "version", 0, PROP_DEFAULT,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT,
	    "1 | 2 | 3 | 4 | 5 | current", "VERSION", version_table);
	zprop_register_index(ZFS_PROP_CANMOUNT, "canmount", ZFS_CANMOUNT_ON,
	    PROP_DEFAULT, ZFS_TYPE_FILESYSTEM, "on | off | noauto",
	    "CANMOUNT", canmount_table);

	/* readonly index (boolean) properties */
	zprop_register_index(ZFS_PROP_MOUNTED, "mounted", 0, PROP_READONLY,
	    ZFS_TYPE_FILESYSTEM, "yes | no", "MOUNTED", boolean_table);
	zprop_register_index(ZFS_PROP_DEFER_DESTROY, "defer_destroy", 0,
	    PROP_READONLY, ZFS_TYPE_SNAPSHOT, "yes | no", "DEFER_DESTROY",
	    boolean_table);

	/* set once index properties */
	zprop_register_index(ZFS_PROP_NORMALIZE, "normalization", 0,
	    PROP_ONETIME, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT,
	    "none | formC | formD | formKC | formKD", "NORMALIZATION",
	    normalize_table);
	zprop_register_index(ZFS_PROP_CASE, "casesensitivity",
	    ZFS_CASE_SENSITIVE, PROP_ONETIME, ZFS_TYPE_FILESYSTEM |
	    ZFS_TYPE_SNAPSHOT,
	    "sensitive | insensitive | mixed", "CASE", case_table);

	/* set once index (boolean) properties */
	zprop_register_index(ZFS_PROP_UTF8ONLY, "utf8only", 0, PROP_ONETIME,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT,
	    "on | off", "UTF8ONLY", boolean_table);

	/* string properties */
	zprop_register_string(ZFS_PROP_ORIGIN, "origin", NULL, PROP_READONLY,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<snapshot>", "ORIGIN");
	zprop_register_string(ZFS_PROP_CLONES, "clones", NULL, PROP_READONLY,
	    ZFS_TYPE_SNAPSHOT, "<dataset>[,...]", "CLONES");
	zprop_register_string(ZFS_PROP_MOUNTPOINT, "mountpoint", "/",
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM, "<path> | legacy | none",
	    "MOUNTPOINT");
	zprop_register_string(ZFS_PROP_SHARENFS, "sharenfs", "off",
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM, "on | off | share(1M) options",
	    "SHARENFS");
	zprop_register_string(ZFS_PROP_TYPE, "type", NULL, PROP_READONLY,
	    ZFS_TYPE_DATASET, "filesystem | volume | snapshot", "TYPE");
	zprop_register_string(ZFS_PROP_SHARESMB, "sharesmb", "off",
	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM,
	    "on | off | sharemgr(1M) options", "SHARESMB");
	zprop_register_string(ZFS_PROP_MLSLABEL, "mlslabel",
	    ZFS_MLSLABEL_DEFAULT, PROP_INHERIT, ZFS_TYPE_DATASET,
	    "<sensitivity label>", "MLSLABEL");

	/* readonly number properties */
	zprop_register_number(ZFS_PROP_USED, "used", 0, PROP_READONLY,
	    ZFS_TYPE_DATASET, "<size>", "USED");
	zprop_register_number(ZFS_PROP_AVAILABLE, "available", 0, PROP_READONLY,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<size>", "AVAIL");
	zprop_register_number(ZFS_PROP_REFERENCED, "referenced", 0,
	    PROP_READONLY, ZFS_TYPE_DATASET, "<size>", "REFER");
	zprop_register_number(ZFS_PROP_COMPRESSRATIO, "compressratio", 0,
	    PROP_READONLY, ZFS_TYPE_DATASET,
	    "<1.00x or higher if compressed>", "RATIO");
	zprop_register_number(ZFS_PROP_REFRATIO, "refcompressratio", 0,
	    PROP_READONLY, ZFS_TYPE_DATASET,
	    "<1.00x or higher if compressed>", "REFRATIO");
	zprop_register_number(ZFS_PROP_VOLBLOCKSIZE, "volblocksize",
	    ZVOL_DEFAULT_BLOCKSIZE, PROP_ONETIME,
	    ZFS_TYPE_VOLUME, "512 to 128k, power of 2",	"VOLBLOCK");
	zprop_register_number(ZFS_PROP_USEDSNAP, "usedbysnapshots", 0,
	    PROP_READONLY, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<size>",
	    "USEDSNAP");
	zprop_register_number(ZFS_PROP_USEDDS, "usedbydataset", 0,
	    PROP_READONLY, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<size>",
	    "USEDDS");
	zprop_register_number(ZFS_PROP_USEDCHILD, "usedbychildren", 0,
	    PROP_READONLY, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<size>",
	    "USEDCHILD");
	zprop_register_number(ZFS_PROP_USEDREFRESERV, "usedbyrefreservation", 0,
	    PROP_READONLY,
	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "<size>", "USEDREFRESERV");
	zprop_register_number(ZFS_PROP_USERREFS, "userrefs", 0, PROP_READONLY,
	    ZFS_TYPE_SNAPSHOT, "<count>", "USERREFS");
	zprop_register_number(ZFS_PROP_WRITTEN, "written", 0, PROP_READONLY,
	    ZFS_TYPE_DATASET, "<size>", "WRITTEN");

	/* default number properties */
	zprop_register_number(ZFS_PROP_QUOTA, "quota", 0, PROP_DEFAULT,
	    ZFS_TYPE_FILESYSTEM, "<size> | none", "QUOTA");
	zprop_register_number(ZFS_PROP_RESERVATION, "reservation", 0,
	    PROP_DEFAULT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "<size> | none", "RESERV");
	zprop_register_number(ZFS_PROP_VOLSIZE, "volsize", 0, PROP_DEFAULT,
	    ZFS_TYPE_VOLUME, "<size>", "VOLSIZE");
	zprop_register_number(ZFS_PROP_REFQUOTA, "refquota", 0, PROP_DEFAULT,
	    ZFS_TYPE_FILESYSTEM, "<size> | none", "REFQUOTA");
	zprop_register_number(ZFS_PROP_REFRESERVATION, "refreservation", 0,
	    PROP_DEFAULT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
	    "<size> | none", "REFRESERV");

	/* inherit number properties */
	zprop_register_number(ZFS_PROP_RECORDSIZE, "recordsize",
	    SPA_MAXBLOCKSIZE, PROP_INHERIT,
	    ZFS_TYPE_FILESYSTEM, "512 to 128k, power of 2", "RECSIZE");

	/* hidden properties */
	zprop_register_hidden(ZFS_PROP_CREATETXG, "createtxg", PROP_TYPE_NUMBER,
	    PROP_READONLY, ZFS_TYPE_DATASET, "CREATETXG");
	zprop_register_hidden(ZFS_PROP_NUMCLONES, "numclones", PROP_TYPE_NUMBER,
	    PROP_READONLY, ZFS_TYPE_SNAPSHOT, "NUMCLONES");
	zprop_register_hidden(ZFS_PROP_NAME, "name", PROP_TYPE_STRING,
	    PROP_READONLY, ZFS_TYPE_DATASET, "NAME");
	zprop_register_hidden(ZFS_PROP_ISCSIOPTIONS, "iscsioptions",
	    PROP_TYPE_STRING, PROP_INHERIT, ZFS_TYPE_VOLUME, "ISCSIOPTIONS");
	zprop_register_hidden(ZFS_PROP_STMF_SHAREINFO, "stmf_sbd_lu",
	    PROP_TYPE_STRING, PROP_INHERIT, ZFS_TYPE_VOLUME,
	    "STMF_SBD_LU");
	zprop_register_hidden(ZFS_PROP_GUID, "guid", PROP_TYPE_NUMBER,
	    PROP_READONLY, ZFS_TYPE_DATASET, "GUID");
	zprop_register_hidden(ZFS_PROP_USERACCOUNTING, "useraccounting",
	    PROP_TYPE_NUMBER, PROP_READONLY, ZFS_TYPE_DATASET,
	    "USERACCOUNTING");
	zprop_register_hidden(ZFS_PROP_UNIQUE, "unique", PROP_TYPE_NUMBER,
	    PROP_READONLY, ZFS_TYPE_DATASET, "UNIQUE");
	zprop_register_hidden(ZFS_PROP_OBJSETID, "objsetid", PROP_TYPE_NUMBER,
	    PROP_READONLY, ZFS_TYPE_DATASET, "OBJSETID");

	/* oddball properties */
	zprop_register_impl(ZFS_PROP_CREATION, "creation", PROP_TYPE_NUMBER, 0,
	    NULL, PROP_READONLY, ZFS_TYPE_DATASET,
	    "<date>", "CREATION", B_FALSE, B_TRUE, NULL);
}

boolean_t
zfs_prop_delegatable(zfs_prop_t prop)
{
	zprop_desc_t *pd = &zfs_prop_table[prop];

	/* The mlslabel property is never delegatable. */
	if (prop == ZFS_PROP_MLSLABEL)
		return (B_FALSE);

	return (pd->pd_attr != PROP_READONLY);
}

/*
 * Given a zfs dataset property name, returns the corresponding property ID.
 */
zfs_prop_t
zfs_name_to_prop(const char *propname)
{
	return (zprop_name_to_prop(propname, ZFS_TYPE_DATASET));
}

/*
 * For user property names, we allow all lowercase alphanumeric characters, plus
 * a few useful punctuation characters.
 */
static int
valid_char(char c)
{
	return ((c >= 'a' && c <= 'z') ||
	    (c >= '0' && c <= '9') ||
	    c == '-' || c == '_' || c == '.' || c == ':');
}

/*
 * Returns true if this is a valid user-defined property (one with a ':').
 */
boolean_t
zfs_prop_user(const char *name)
{
	int i;
	char c;
	boolean_t foundsep = B_FALSE;

	for (i = 0; i < strlen(name); i++) {
		c = name[i];
		if (!valid_char(c))
			return (B_FALSE);
		if (c == ':')
			foundsep = B_TRUE;
	}

	if (!foundsep)
		return (B_FALSE);

	return (B_TRUE);
}

/*
 * Returns true if this is a valid userspace-type property (one with a '@').
 * Note that after the @, any character is valid (eg, another @, for SID
 * user@domain).
 */
boolean_t
zfs_prop_userquota(const char *name)
{
	zfs_userquota_prop_t prop;

	for (prop = 0; prop < ZFS_NUM_USERQUOTA_PROPS; prop++) {
		if (strncmp(name, zfs_userquota_prop_prefixes[prop],
		    strlen(zfs_userquota_prop_prefixes[prop])) == 0) {
			return (B_TRUE);
		}
	}

	return (B_FALSE);
}

/*
 * Returns true if this is a valid written@ property.
 * Note that after the @, any character is valid (eg, another @, for
 * written@pool/fs@origin).
 */
boolean_t
zfs_prop_written(const char *name)
{
	static const char *prefix = "written@";
	return (strncmp(name, prefix, strlen(prefix)) == 0);
}

/*
 * Tables of index types, plus functions to convert between the user view
 * (strings) and internal representation (uint64_t).
 */
int
zfs_prop_string_to_index(zfs_prop_t prop, const char *string, uint64_t *index)
{
	return (zprop_string_to_index(prop, string, index, ZFS_TYPE_DATASET));
}

int
zfs_prop_index_to_string(zfs_prop_t prop, uint64_t index, const char **string)
{
	return (zprop_index_to_string(prop, index, string, ZFS_TYPE_DATASET));
}

uint64_t
zfs_prop_random_value(zfs_prop_t prop, uint64_t seed)
{
	return (zprop_random_value(prop, seed, ZFS_TYPE_DATASET));
}

/*
 * Returns TRUE if the property applies to any of the given dataset types.
 */
boolean_t
zfs_prop_valid_for_type(int prop, zfs_type_t types)
{
	return (zprop_valid_for_type(prop, types));
}

zprop_type_t
zfs_prop_get_type(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_proptype);
}

/*
 * Returns TRUE if the property is readonly.
 */
boolean_t
zfs_prop_readonly(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_attr == PROP_READONLY ||
	    zfs_prop_table[prop].pd_attr == PROP_ONETIME);
}

/*
 * Returns TRUE if the property is only allowed to be set once.
 */
boolean_t
zfs_prop_setonce(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_attr == PROP_ONETIME);
}

const char *
zfs_prop_default_string(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_strdefault);
}

uint64_t
zfs_prop_default_numeric(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_numdefault);
}

/*
 * Given a dataset property ID, returns the corresponding name.
 * Assuming the zfs dataset property ID is valid.
 */
const char *
zfs_prop_to_name(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_name);
}

/*
 * Returns TRUE if the property is inheritable.
 */
boolean_t
zfs_prop_inheritable(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_attr == PROP_INHERIT ||
	    zfs_prop_table[prop].pd_attr == PROP_ONETIME);
}

#ifndef _KERNEL

/*
 * Returns a string describing the set of acceptable values for the given
 * zfs property, or NULL if it cannot be set.
 */
const char *
zfs_prop_values(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_values);
}

/*
 * Returns TRUE if this property is a string type.  Note that index types
 * (compression, checksum) are treated as strings in userland, even though they
 * are stored numerically on disk.
 */
int
zfs_prop_is_string(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_proptype == PROP_TYPE_STRING ||
	    zfs_prop_table[prop].pd_proptype == PROP_TYPE_INDEX);
}

/*
 * Returns the column header for the given property.  Used only in
 * 'zfs list -o', but centralized here with the other property information.
 */
const char *
zfs_prop_column_name(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_colname);
}

/*
 * Returns whether the given property should be displayed right-justified for
 * 'zfs list'.
 */
boolean_t
zfs_prop_align_right(zfs_prop_t prop)
{
	return (zfs_prop_table[prop].pd_rightalign);
}

#endif