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