1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _LINUX_MTIO_COMPAT_H
3*4882a593Smuzhiyun #define _LINUX_MTIO_COMPAT_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/compat.h>
6*4882a593Smuzhiyun #include <uapi/linux/mtio.h>
7*4882a593Smuzhiyun #include <linux/uaccess.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun * helper functions for implementing compat ioctls on the four tape
11*4882a593Smuzhiyun * drivers: we define the 32-bit layout of each incompatible structure,
12*4882a593Smuzhiyun * plus a wrapper function to copy it to user space in either format.
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct mtget32 {
16*4882a593Smuzhiyun s32 mt_type;
17*4882a593Smuzhiyun s32 mt_resid;
18*4882a593Smuzhiyun s32 mt_dsreg;
19*4882a593Smuzhiyun s32 mt_gstat;
20*4882a593Smuzhiyun s32 mt_erreg;
21*4882a593Smuzhiyun s32 mt_fileno;
22*4882a593Smuzhiyun s32 mt_blkno;
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun #define MTIOCGET32 _IOR('m', 2, struct mtget32)
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun struct mtpos32 {
27*4882a593Smuzhiyun s32 mt_blkno;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun #define MTIOCPOS32 _IOR('m', 3, struct mtpos32)
30*4882a593Smuzhiyun
put_user_mtget(void __user * u,struct mtget * k)31*4882a593Smuzhiyun static inline int put_user_mtget(void __user *u, struct mtget *k)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun struct mtget32 k32 = {
34*4882a593Smuzhiyun .mt_type = k->mt_type,
35*4882a593Smuzhiyun .mt_resid = k->mt_resid,
36*4882a593Smuzhiyun .mt_dsreg = k->mt_dsreg,
37*4882a593Smuzhiyun .mt_gstat = k->mt_gstat,
38*4882a593Smuzhiyun .mt_erreg = k->mt_erreg,
39*4882a593Smuzhiyun .mt_fileno = k->mt_fileno,
40*4882a593Smuzhiyun .mt_blkno = k->mt_blkno,
41*4882a593Smuzhiyun };
42*4882a593Smuzhiyun int ret;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (in_compat_syscall())
45*4882a593Smuzhiyun ret = copy_to_user(u, &k32, sizeof(k32));
46*4882a593Smuzhiyun else
47*4882a593Smuzhiyun ret = copy_to_user(u, k, sizeof(*k));
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return ret ? -EFAULT : 0;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
put_user_mtpos(void __user * u,struct mtpos * k)52*4882a593Smuzhiyun static inline int put_user_mtpos(void __user *u, struct mtpos *k)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun if (in_compat_syscall())
55*4882a593Smuzhiyun return put_user(k->mt_blkno, (u32 __user *)u);
56*4882a593Smuzhiyun else
57*4882a593Smuzhiyun return put_user(k->mt_blkno, (long __user *)u);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #endif
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