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 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 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 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