1 /*
2 * CDDL HEADER SART
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved.
24 */
25
26 #include <err.h>
27
28 #include "libzfs_compat.h"
29
30 int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
31 static int zfs_spa_version = -1;
32
33 /*
34 * Get zfs_ioctl_version
35 */
36 int
get_zfs_ioctl_version(void)37 get_zfs_ioctl_version(void)
38 {
39 size_t ver_size;
40 int ver = ZFS_IOCVER_NONE;
41
42 ver_size = sizeof(ver);
43 if (sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0) < 0)
44 err(1, "sysctl vfs.zfs.version.ioctl failed");
45
46 return (ver);
47 }
48
49 /*
50 * Get the SPA version
51 */
52 static int
get_zfs_spa_version(void)53 get_zfs_spa_version(void)
54 {
55 size_t ver_size;
56 int ver = 0;
57
58 ver_size = sizeof(ver);
59 if (sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0) < 0)
60 err(1, "sysctl vfs.zfs.version.spa failed");
61
62 return (ver);
63 }
64
65 /*
66 * This is FreeBSD version of ioctl, because Solaris' ioctl() updates
67 * zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
68 * error is returned zc_nvlist_dst_size won't be updated.
69 */
70 int
zcmd_ioctl(int fd,int request,zfs_cmd_t * zc)71 zcmd_ioctl(int fd, int request, zfs_cmd_t *zc)
72 {
73 size_t oldsize;
74 int ret, cflag = ZFS_CMD_COMPAT_NONE;
75
76 if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
77 zfs_ioctl_version = get_zfs_ioctl_version();
78
79 if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) {
80 switch (zfs_ioctl_version) {
81 case ZFS_IOCVER_RESUME:
82 cflag = ZFS_CMD_COMPAT_RESUME;
83 break;
84 case ZFS_IOCVER_EDBP:
85 cflag = ZFS_CMD_COMPAT_EDBP;
86 break;
87 case ZFS_IOCVER_ZCMD:
88 cflag = ZFS_CMD_COMPAT_ZCMD;
89 break;
90 case ZFS_IOCVER_LZC:
91 cflag = ZFS_CMD_COMPAT_LZC;
92 break;
93 case ZFS_IOCVER_DEADMAN:
94 cflag = ZFS_CMD_COMPAT_DEADMAN;
95 break;
96 }
97 } else {
98 /*
99 * If vfs.zfs.version.ioctl is not defined, assume we have v28
100 * compatible binaries and use vfs.zfs.version.spa to test for v15
101 */
102 cflag = ZFS_CMD_COMPAT_V28;
103
104 if (zfs_spa_version < 0)
105 zfs_spa_version = get_zfs_spa_version();
106
107 if (zfs_spa_version == SPA_VERSION_15 ||
108 zfs_spa_version == SPA_VERSION_14 ||
109 zfs_spa_version == SPA_VERSION_13)
110 cflag = ZFS_CMD_COMPAT_V15;
111 }
112
113 oldsize = zc->zc_nvlist_dst_size;
114 ret = zcmd_ioctl_compat(fd, request, zc, cflag);
115
116 if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {
117 ret = -1;
118 errno = ENOMEM;
119 }
120
121 return (ret);
122 }
123