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