| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * |
| * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| * or http://www.opensolaris.org/os/licensing. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * |
| * When distributing Covered Code, include this CDDL HEADER in each |
| * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| * If applicable, add the following below this CDDL HEADER, with the |
| * fields enclosed by brackets "[]" replaced with your own identifying |
| * information: Portions Copyright [yyyy] [name of copyright owner] |
| * |
| * CDDL HEADER END |
| */ |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <sys/sysctl.h> |
| #include <sys/zfs_ioctl.h> |
| #include <os/freebsd/zfs/sys/zfs_ioctl_compat.h> |
| #include <libzutil.h> |
| |
| #include <err.h> |
| |
| int zfs_ioctl_version = ZFS_IOCVER_UNDEF; |
| |
| /* |
| * Get zfs_ioctl_version |
| */ |
| static int |
| get_zfs_ioctl_version(void) |
| { |
| size_t ver_size; |
| int ver = ZFS_IOCVER_NONE; |
| |
| ver_size = sizeof (ver); |
| sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0); |
| |
| return (ver); |
| } |
| |
| static int |
| zcmd_ioctl_compat(int fd, int request, zfs_cmd_t *zc, const int cflag) |
| { |
| int newrequest, ret; |
| void *zc_c = NULL; |
| unsigned long ncmd; |
| zfs_iocparm_t zp; |
| |
| switch (cflag) { |
| case ZFS_CMD_COMPAT_NONE: |
| ncmd = _IOWR('Z', request, zfs_iocparm_t); |
| zp.zfs_cmd = (uint64_t)(uintptr_t)zc; |
| zp.zfs_cmd_size = sizeof (zfs_cmd_t); |
| zp.zfs_ioctl_version = ZFS_IOCVER_OZFS; |
| break; |
| case ZFS_CMD_COMPAT_LEGACY: |
| newrequest = zfs_ioctl_ozfs_to_legacy(request); |
| ncmd = _IOWR('Z', newrequest, zfs_iocparm_t); |
| zc_c = malloc(sizeof (zfs_cmd_legacy_t)); |
| zfs_cmd_ozfs_to_legacy(zc, zc_c); |
| zp.zfs_cmd = (uint64_t)(uintptr_t)zc_c; |
| zp.zfs_cmd_size = sizeof (zfs_cmd_legacy_t); |
| zp.zfs_ioctl_version = ZFS_IOCVER_LEGACY; |
| break; |
| default: |
| abort(); |
| return (EINVAL); |
| } |
| |
| ret = ioctl(fd, ncmd, &zp); |
| if (ret) { |
| if (zc_c) |
| free(zc_c); |
| return (ret); |
| } |
| if (zc_c) { |
| zfs_cmd_legacy_to_ozfs(zc_c, zc); |
| free(zc_c); |
| } |
| return (ret); |
| } |
| |
| /* |
| * This is FreeBSD version of ioctl, because Solaris' ioctl() updates |
| * zc_nvlist_dst_size even if an error is returned, on FreeBSD if an |
| * error is returned zc_nvlist_dst_size won't be updated. |
| */ |
| int |
| zfs_ioctl_fd(int fd, unsigned long request, zfs_cmd_t *zc) |
| { |
| size_t oldsize; |
| int ret, cflag = ZFS_CMD_COMPAT_NONE; |
| |
| if (zfs_ioctl_version == ZFS_IOCVER_UNDEF) |
| zfs_ioctl_version = get_zfs_ioctl_version(); |
| |
| switch (zfs_ioctl_version) { |
| case ZFS_IOCVER_LEGACY: |
| cflag = ZFS_CMD_COMPAT_LEGACY; |
| break; |
| case ZFS_IOCVER_OZFS: |
| cflag = ZFS_CMD_COMPAT_NONE; |
| break; |
| default: |
| errx(1, "unrecognized zfs ioctl version %d", |
| zfs_ioctl_version); |
| } |
| |
| oldsize = zc->zc_nvlist_dst_size; |
| ret = zcmd_ioctl_compat(fd, request, zc, cflag); |
| |
| if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) { |
| ret = -1; |
| errno = ENOMEM; |
| } |
| |
| return (ret); |
| } |