125 lines
3 KiB
C
125 lines
3 KiB
C
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/*
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* CDDL HEADER START
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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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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/zfs_ioctl.h>
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#include <os/freebsd/zfs/sys/zfs_ioctl_compat.h>
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#include <libzutil.h>
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#include <err.h>
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int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
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/*
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* Get zfs_ioctl_version
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*/
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static 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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static int
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zcmd_ioctl_compat(int fd, int request, zfs_cmd_t *zc, const int cflag)
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{
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int newrequest, ret;
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void *zc_c = NULL;
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unsigned long ncmd;
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zfs_iocparm_t zp;
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switch (cflag) {
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case ZFS_CMD_COMPAT_NONE:
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ncmd = _IOWR('Z', request, zfs_iocparm_t);
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zp.zfs_cmd = (uint64_t)zc;
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zp.zfs_cmd_size = sizeof (zfs_cmd_t);
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zp.zfs_ioctl_version = ZFS_IOCVER_OZFS;
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break;
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case ZFS_CMD_COMPAT_LEGACY:
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newrequest = zfs_ioctl_ozfs_to_legacy(request);
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ncmd = _IOWR('Z', newrequest, zfs_iocparm_t);
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zc_c = malloc(sizeof (zfs_cmd_legacy_t));
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zfs_cmd_ozfs_to_legacy(zc, zc_c);
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zp.zfs_cmd = (uint64_t)zc_c;
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zp.zfs_cmd_size = sizeof (zfs_cmd_legacy_t);
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zp.zfs_ioctl_version = ZFS_IOCVER_LEGACY;
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break;
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default:
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abort();
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return (EINVAL);
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}
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ret = ioctl(fd, ncmd, &zp);
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if (ret) {
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if (zc_c)
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free(zc_c);
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return (ret);
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}
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if (zc_c) {
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zfs_cmd_legacy_to_ozfs(zc_c, zc);
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free(zc_c);
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}
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return (ret);
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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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zfs_ioctl_fd(int fd, unsigned long 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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switch (zfs_ioctl_version) {
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case ZFS_IOCVER_LEGACY:
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cflag = ZFS_CMD_COMPAT_LEGACY;
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break;
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case ZFS_IOCVER_OZFS:
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cflag = ZFS_CMD_COMPAT_NONE;
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break;
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default:
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errx(1, "unrecognized zfs ioctl version %d",
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zfs_ioctl_version);
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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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