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60 lines
1.3 KiB
60 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_MTIO_COMPAT_H |
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#define _LINUX_MTIO_COMPAT_H |
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#include <linux/compat.h> |
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#include <uapi/linux/mtio.h> |
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#include <linux/uaccess.h> |
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/* |
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* helper functions for implementing compat ioctls on the four tape |
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* drivers: we define the 32-bit layout of each incompatible structure, |
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* plus a wrapper function to copy it to user space in either format. |
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*/ |
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struct mtget32 { |
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s32 mt_type; |
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s32 mt_resid; |
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s32 mt_dsreg; |
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s32 mt_gstat; |
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s32 mt_erreg; |
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s32 mt_fileno; |
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s32 mt_blkno; |
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}; |
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#define MTIOCGET32 _IOR('m', 2, struct mtget32) |
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struct mtpos32 { |
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s32 mt_blkno; |
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}; |
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#define MTIOCPOS32 _IOR('m', 3, struct mtpos32) |
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static inline int put_user_mtget(void __user *u, struct mtget *k) |
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{ |
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struct mtget32 k32 = { |
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.mt_type = k->mt_type, |
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.mt_resid = k->mt_resid, |
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.mt_dsreg = k->mt_dsreg, |
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.mt_gstat = k->mt_gstat, |
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.mt_erreg = k->mt_erreg, |
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.mt_fileno = k->mt_fileno, |
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.mt_blkno = k->mt_blkno, |
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}; |
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int ret; |
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if (in_compat_syscall()) |
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ret = copy_to_user(u, &k32, sizeof(k32)); |
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else |
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ret = copy_to_user(u, k, sizeof(*k)); |
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return ret ? -EFAULT : 0; |
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} |
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static inline int put_user_mtpos(void __user *u, struct mtpos *k) |
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{ |
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if (in_compat_syscall()) |
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return put_user(k->mt_blkno, (u32 __user *)u); |
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else |
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return put_user(k->mt_blkno, (long __user *)u); |
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} |
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#endif
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