LXR linux/include/linux/mtio.h

   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
  15struct  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
  26struct  mtpos32 {
  27        s32     mt_blkno;
  28};
  29#define MTIOCPOS32      _IOR('m', 3, struct mtpos32)
  30
  31static 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
  52static 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