1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_MTIO_COMPAT_H
3#define _LINUX_MTIO_COMPAT_H
4
5#include <linux/compat.h>
6#include <uapi/linux/mtio.h>
7#include <linux/uaccess.h>
8
9/*
10 * helper functions for implementing compat ioctls on the four tape
11 * drivers: we define the 32-bit layout of each incompatible structure,
12 * plus a wrapper function to copy it to user space in either format.
13 */
14
15struct	mtget32 {
16	s32	mt_type;
17	s32	mt_resid;
18	s32	mt_dsreg;
19	s32	mt_gstat;
20	s32	mt_erreg;
21	s32	mt_fileno;
22	s32	mt_blkno;
23};
24#define	MTIOCGET32	_IOR('m', 2, struct mtget32)
25
26struct	mtpos32 {
27	s32 	mt_blkno;
28};
29#define	MTIOCPOS32	_IOR('m', 3, struct mtpos32)
30
31static inline int put_user_mtget(void __user *u, struct mtget *k)
32{
33	struct mtget32 k32 = {
34		.mt_type   = k->mt_type,
35		.mt_resid  = k->mt_resid,
36		.mt_dsreg  = k->mt_dsreg,
37		.mt_gstat  = k->mt_gstat,
38		.mt_erreg  = k->mt_erreg,
39		.mt_fileno = k->mt_fileno,
40		.mt_blkno  = k->mt_blkno,
41	};
42	int ret;
43
44	if (in_compat_syscall())
45		ret = copy_to_user(u, &k32, sizeof(k32));
46	else
47		ret = copy_to_user(u, k, sizeof(*k));
48
49	return ret ? -EFAULT : 0;
50}
51
52static inline int put_user_mtpos(void __user *u, struct mtpos *k)
53{
54	if (in_compat_syscall())
55		return put_user(k->mt_blkno, (u32 __user *)u);
56	else
57		return put_user(k->mt_blkno, (long __user *)u);
58}
59
60#endif
61