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/*
* CDDL HEADER SART
*
* 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) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
*/
#include "libzfs_compat.h"
int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
static int zfs_spa_version = -1;
/*
* Get zfs_ioctl_version
*/
int
get_zfs_ioctl_version(void)
{
size_t ver_size;
int ver = ZFS_IOCVER_NONE;
ver_size = sizeof(ver);
sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0);
return (ver);
}
/*
* Get the SPA version
*/
static int
get_zfs_spa_version(void)
{
size_t ver_size;
int ver = 0;
ver_size = sizeof(ver);
sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0);
return (ver);
}
/*
* This is FreeBSD version of ioctl, because Solaris' ioctl() updates
* zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
* error is returned zc_nvlist_dst_size won't be updated.
*/
int
zcmd_ioctl(int fd, int request, zfs_cmd_t *zc)
{
size_t oldsize;
int ret, cflag = ZFS_CMD_COMPAT_NONE;
if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
zfs_ioctl_version = get_zfs_ioctl_version();
if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) {
switch (zfs_ioctl_version) {
case ZFS_IOCVER_ZCMD:
cflag = ZFS_CMD_COMPAT_ZCMD;
break;
case ZFS_IOCVER_LZC:
cflag = ZFS_CMD_COMPAT_LZC;
break;
case ZFS_IOCVER_DEADMAN:
cflag = ZFS_CMD_COMPAT_DEADMAN;
break;
}
} else {
/*
* If vfs.zfs.version.ioctl is not defined, assume we have v28
* compatible binaries and use vfs.zfs.version.spa to test for v15
*/
cflag = ZFS_CMD_COMPAT_V28;
if (zfs_spa_version < 0)
zfs_spa_version = get_zfs_spa_version();
if (zfs_spa_version == SPA_VERSION_15 ||
zfs_spa_version == SPA_VERSION_14 ||
zfs_spa_version == SPA_VERSION_13)
cflag = ZFS_CMD_COMPAT_V15;
}
oldsize = zc->zc_nvlist_dst_size;
ret = zcmd_ioctl_compat(fd, request, zc, cflag);
if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {
ret = -1;
errno = ENOMEM;
}
return (ret);
}
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