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
61
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