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