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1207045d AB |
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 | ||
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 | ||
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 |