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(to: u, from: &k32, n: sizeof(k32)); |
46 | else |
47 | ret = copy_to_user(to: u, from: k, n: 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 |
61 | |