4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
26 #include "libzfs_compat.h"
28 int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
29 static int zfs_spa_version = -1;
32 * Get zfs_ioctl_version
35 get_zfs_ioctl_version(void)
38 int ver = ZFS_IOCVER_NONE;
40 ver_size = sizeof(ver);
41 sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0);
50 get_zfs_spa_version(void)
55 ver_size = sizeof(ver);
56 sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0);
62 * This is FreeBSD version of ioctl, because Solaris' ioctl() updates
63 * zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
64 * error is returned zc_nvlist_dst_size won't be updated.
67 zcmd_ioctl(int fd, int request, zfs_cmd_t *zc)
70 int ret, cflag = ZFS_CMD_COMPAT_NONE;
72 if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
73 zfs_ioctl_version = get_zfs_ioctl_version();
75 if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) {
76 switch (zfs_ioctl_version) {
77 case ZFS_IOCVER_RESUME:
78 cflag = ZFS_CMD_COMPAT_RESUME;
81 cflag = ZFS_CMD_COMPAT_EDBP;
84 cflag = ZFS_CMD_COMPAT_ZCMD;
87 cflag = ZFS_CMD_COMPAT_LZC;
89 case ZFS_IOCVER_DEADMAN:
90 cflag = ZFS_CMD_COMPAT_DEADMAN;
95 * If vfs.zfs.version.ioctl is not defined, assume we have v28
96 * compatible binaries and use vfs.zfs.version.spa to test for v15
98 cflag = ZFS_CMD_COMPAT_V28;
100 if (zfs_spa_version < 0)
101 zfs_spa_version = get_zfs_spa_version();
103 if (zfs_spa_version == SPA_VERSION_15 ||
104 zfs_spa_version == SPA_VERSION_14 ||
105 zfs_spa_version == SPA_VERSION_13)
106 cflag = ZFS_CMD_COMPAT_V15;
109 oldsize = zc->zc_nvlist_dst_size;
110 ret = zcmd_ioctl_compat(fd, request, zc, cflag);
112 if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {