/*

 * 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

 */

/*

 */

/*

 * This file is intended for functions that ought to be common between user

 * land (libzfs) and the kernel. When many common routines need to be shared

 * then a separate file should to be created.

 */

#if defined(_KERNEL)

#include <sys/systm.h>

#else

#include <string.h>

#endif

#include <sys/types.h>

#include <sys/fs/zfs.h>

#include <sys/int_limits.h>

#include <sys/nvpair.h>

#include "zfs_comutil.h"

/*

 * Are there allocatable vdevs?

 */

boolean_t

zfs_allocatable_devs(nvlist_t *nv)

{

	uint64_t is_log;

	uint_t c;

	nvlist_t **child;

	uint_t children;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,

	    &child, &children) != 0) {

		return (B_FALSE);

	}

	for (c = 0; c < children; c++) {

		is_log = 0;

		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,

		    &is_log);

		if (!is_log)

			return (B_TRUE);

	}

	return (B_FALSE);

}

void

zpool_get_rewind_policy(nvlist_t *nvl, zpool_rewind_policy_t *zrpp)

{

	nvlist_t *policy;

	nvpair_t *elem;

	char *nm;

	/* Defaults */

	zrpp->zrp_request = ZPOOL_NO_REWIND;

	zrpp->zrp_maxmeta = 0;

	zrpp->zrp_maxdata = UINT64_MAX;

	zrpp->zrp_txg = UINT64_MAX;

	if (nvl == NULL)

		return;

	elem = NULL;

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

		nm = nvpair_name(elem);

		if (strcmp(nm, ZPOOL_REWIND_POLICY) == 0) {

			if (nvpair_value_nvlist(elem, &policy) == 0)

				zpool_get_rewind_policy(policy, zrpp);

			return;

		} else if (strcmp(nm, ZPOOL_REWIND_REQUEST) == 0) {

			if (nvpair_value_uint32(elem, &zrpp->zrp_request) == 0)

				if (zrpp->zrp_request & ~ZPOOL_REWIND_POLICIES)

					zrpp->zrp_request = ZPOOL_NO_REWIND;

		} else if (strcmp(nm, ZPOOL_REWIND_REQUEST_TXG) == 0) {

			(void) nvpair_value_uint64(elem, &zrpp->zrp_txg);

		} else if (strcmp(nm, ZPOOL_REWIND_META_THRESH) == 0) {

			(void) nvpair_value_uint64(elem, &zrpp->zrp_maxmeta);

		} else if (strcmp(nm, ZPOOL_REWIND_DATA_THRESH) == 0) {

			(void) nvpair_value_uint64(elem, &zrpp->zrp_maxdata);

		}

	}

	if (zrpp->zrp_request == 0)

		zrpp->zrp_request = ZPOOL_NO_REWIND;

}

typedef struct zfs_version_spa_map {

	int	version_zpl;

	int	version_spa;

} zfs_version_spa_map_t;

/*

 * Keep this table in monotonically increasing version number order.

 */

static zfs_version_spa_map_t zfs_version_table[] = {

	{ZPL_VERSION_INITIAL, SPA_VERSION_INITIAL},

	{ZPL_VERSION_DIRENT_TYPE, SPA_VERSION_INITIAL},

	{ZPL_VERSION_FUID, SPA_VERSION_FUID},

	{ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},

	{ZPL_VERSION_SA, SPA_VERSION_SA},

	{0, 0}

};

/*

 * Return the max zpl version for a corresponding spa version

 * -1 is returned if no mapping exists.

 */

int

zfs_zpl_version_map(int spa_version)

{

	int i;

	int version = -1;

	for (i = 0; zfs_version_table[i].version_spa; i++) {

		if (spa_version >= zfs_version_table[i].version_spa)

			version = zfs_version_table[i].version_zpl;

	}

	return (version);

}

/*

 * Return the min spa version for a corresponding spa version

 * -1 is returned if no mapping exists.

 */

int

zfs_spa_version_map(int zpl_version)

{

	int i;

	int version = -1;

	for (i = 0; zfs_version_table[i].version_zpl; i++) {

		if (zfs_version_table[i].version_zpl >= zpl_version)

			return (zfs_version_table[i].version_spa);

	}

	return (version);

}