lib/libzutil/os/freebsd/zutil_compat.c

   1 /*
   2  * CDDL HEADER START
   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 #include <sys/types.h>
  22 #include <sys/param.h>
  23 #include <sys/zfs_ioctl.h>
  24 #include <os/freebsd/zfs/sys/zfs_ioctl_compat.h>
  25 #include <libzutil.h>
  26
  27 static int
  28 zcmd_ioctl_compat(int fd, int request, zfs_cmd_t *zc, const int cflag)
  29 {
  30         int ret;
  31         void *zc_c;
  32         unsigned long ncmd;
  33         zfs_iocparm_t zp;
  34
  35         switch (cflag) {
  36         case ZFS_CMD_COMPAT_NONE:
  37                 ncmd = _IOWR('Z', request, zfs_iocparm_t);
  38                 zp.zfs_cmd = (uint64_t)zc;
  39                 zp.zfs_cmd_size = sizeof (zfs_cmd_t);
  40                 zp.zfs_ioctl_version = ZFS_IOCVER_ZOF;
  41                 return (ioctl(fd, ncmd, &zp));
  42         default:
  43                 abort();
  44                 return (EINVAL);
  45         }
  46
  47         ret = ioctl(fd, ncmd, zc_c);
  48         zfs_cmd_compat_get(zc, (caddr_t)zc_c, cflag);
  49         free(zc_c);
  50
  51         return (ret);
  52 }
  53
  54 /*
  55  * This is FreeBSD version of ioctl, because Solaris' ioctl() updates
  56  * zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
  57  * error is returned zc_nvlist_dst_size won't be updated.
  58  */
  59 int
  60 zfs_ioctl_fd(int fd, unsigned long request, zfs_cmd_t *zc)
  61 {
  62         size_t oldsize;
  63         int ret, cflag = ZFS_CMD_COMPAT_NONE;
  64
  65         oldsize = zc->zc_nvlist_dst_size;
  66         ret = zcmd_ioctl_compat(fd, request, zc, cflag);
  67
  68         if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {
  69                 ret = -1;
  70                 errno = ENOMEM;
  71         }
  72
  73         return (ret);
  74 }