libzfs_compat.c revision 290756
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 "libzfs_compat.h" 27 28int zfs_ioctl_version = ZFS_IOCVER_UNDEF; 29static int zfs_spa_version = -1; 30 31/* 32 * Get zfs_ioctl_version 33 */ 34int 35get_zfs_ioctl_version(void) 36{ 37 size_t ver_size; 38 int ver = ZFS_IOCVER_NONE; 39 40 ver_size = sizeof(ver); 41 sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0); 42 43 return (ver); 44} 45 46/* 47 * Get the SPA version 48 */ 49static int 50get_zfs_spa_version(void) 51{ 52 size_t ver_size; 53 int ver = 0; 54 55 ver_size = sizeof(ver); 56 sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0); 57 58 return (ver); 59} 60 61/* 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. 65 */ 66int 67zcmd_ioctl(int fd, int request, zfs_cmd_t *zc) 68{ 69 size_t oldsize; 70 int ret, cflag = ZFS_CMD_COMPAT_NONE; 71 72 if (zfs_ioctl_version == ZFS_IOCVER_UNDEF) 73 zfs_ioctl_version = get_zfs_ioctl_version(); 74 75 if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) { 76 switch (zfs_ioctl_version) { 77 case ZFS_IOCVER_EDBP: 78 cflag = ZFS_CMD_COMPAT_EDBP; 79 break; 80 case ZFS_IOCVER_ZCMD: 81 cflag = ZFS_CMD_COMPAT_ZCMD; 82 break; 83 case ZFS_IOCVER_LZC: 84 cflag = ZFS_CMD_COMPAT_LZC; 85 break; 86 case ZFS_IOCVER_DEADMAN: 87 cflag = ZFS_CMD_COMPAT_DEADMAN; 88 break; 89 } 90 } else { 91 /* 92 * If vfs.zfs.version.ioctl is not defined, assume we have v28 93 * compatible binaries and use vfs.zfs.version.spa to test for v15 94 */ 95 cflag = ZFS_CMD_COMPAT_V28; 96 97 if (zfs_spa_version < 0) 98 zfs_spa_version = get_zfs_spa_version(); 99 100 if (zfs_spa_version == SPA_VERSION_15 || 101 zfs_spa_version == SPA_VERSION_14 || 102 zfs_spa_version == SPA_VERSION_13) 103 cflag = ZFS_CMD_COMPAT_V15; 104 } 105 106 oldsize = zc->zc_nvlist_dst_size; 107 ret = zcmd_ioctl_compat(fd, request, zc, cflag); 108 109 if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) { 110 ret = -1; 111 errno = ENOMEM; 112 } 113 114 return (ret); 115} 116