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 
15 struct	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 
26 struct	mtpos32 {
27 	s32 	mt_blkno;
28 };
29 #define	MTIOCPOS32	_IOR('m', 3, struct mtpos32)
30 
put_user_mtget(void __user * u,struct mtget * k)31 static 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 
put_user_mtpos(void __user * u,struct mtpos * k)52 static 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