f2d3f6918e
This fixes compatibility between old kernel and new ZFS tools. It seems to be tradition to forget it. :( PR: 221112 MFC after: 3 days
122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* CDDL HEADER SART
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
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*/
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#include "libzfs_compat.h"
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int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
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static int zfs_spa_version = -1;
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/*
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* Get zfs_ioctl_version
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*/
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int
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get_zfs_ioctl_version(void)
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{
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size_t ver_size;
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int ver = ZFS_IOCVER_NONE;
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ver_size = sizeof(ver);
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sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0);
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return (ver);
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}
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/*
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* Get the SPA version
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*/
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static int
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get_zfs_spa_version(void)
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{
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size_t ver_size;
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int ver = 0;
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ver_size = sizeof(ver);
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sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0);
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return (ver);
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}
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/*
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* This is FreeBSD version of ioctl, because Solaris' ioctl() updates
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* zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
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* error is returned zc_nvlist_dst_size won't be updated.
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*/
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int
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zcmd_ioctl(int fd, int request, zfs_cmd_t *zc)
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{
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size_t oldsize;
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int ret, cflag = ZFS_CMD_COMPAT_NONE;
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if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
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zfs_ioctl_version = get_zfs_ioctl_version();
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if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) {
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switch (zfs_ioctl_version) {
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case ZFS_IOCVER_INLANES:
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cflag = ZFS_CMD_COMPAT_INLANES;
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break;
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case ZFS_IOCVER_RESUME:
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cflag = ZFS_CMD_COMPAT_RESUME;
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break;
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case ZFS_IOCVER_EDBP:
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cflag = ZFS_CMD_COMPAT_EDBP;
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break;
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case ZFS_IOCVER_ZCMD:
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cflag = ZFS_CMD_COMPAT_ZCMD;
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break;
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case ZFS_IOCVER_LZC:
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cflag = ZFS_CMD_COMPAT_LZC;
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break;
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case ZFS_IOCVER_DEADMAN:
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cflag = ZFS_CMD_COMPAT_DEADMAN;
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break;
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}
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} else {
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/*
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* If vfs.zfs.version.ioctl is not defined, assume we have v28
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* compatible binaries and use vfs.zfs.version.spa to test for v15
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*/
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cflag = ZFS_CMD_COMPAT_V28;
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if (zfs_spa_version < 0)
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zfs_spa_version = get_zfs_spa_version();
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if (zfs_spa_version == SPA_VERSION_15 ||
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zfs_spa_version == SPA_VERSION_14 ||
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zfs_spa_version == SPA_VERSION_13)
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cflag = ZFS_CMD_COMPAT_V15;
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}
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oldsize = zc->zc_nvlist_dst_size;
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ret = zcmd_ioctl_compat(fd, request, zc, cflag);
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if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {
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ret = -1;
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errno = ENOMEM;
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}
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return (ret);
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}
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