117 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * linux/fs/ufs/swab.h4 *5 * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org>6 * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>7 * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org>8 */9 10#ifndef _UFS_SWAB_H11#define _UFS_SWAB_H12 13/*14 * Notes:15 * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes16 * in case there are ufs implementations that have strange bytesexes,17 * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h18 * to support them.19 */20 21enum {22 BYTESEX_LE,23 BYTESEX_BE24};25 26static inline u6427fs64_to_cpu(struct super_block *sbp, __fs64 n)28{29 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)30 return le64_to_cpu((__force __le64)n);31 else32 return be64_to_cpu((__force __be64)n);33}34 35static inline __fs6436cpu_to_fs64(struct super_block *sbp, u64 n)37{38 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)39 return (__force __fs64)cpu_to_le64(n);40 else41 return (__force __fs64)cpu_to_be64(n);42}43 44static inline u3245fs32_to_cpu(struct super_block *sbp, __fs32 n)46{47 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)48 return le32_to_cpu((__force __le32)n);49 else50 return be32_to_cpu((__force __be32)n);51}52 53static inline __fs3254cpu_to_fs32(struct super_block *sbp, u32 n)55{56 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)57 return (__force __fs32)cpu_to_le32(n);58 else59 return (__force __fs32)cpu_to_be32(n);60}61 62static inline void63fs32_add(struct super_block *sbp, __fs32 *n, int d)64{65 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)66 le32_add_cpu((__le32 *)n, d);67 else68 be32_add_cpu((__be32 *)n, d);69}70 71static inline void72fs32_sub(struct super_block *sbp, __fs32 *n, int d)73{74 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)75 le32_add_cpu((__le32 *)n, -d);76 else77 be32_add_cpu((__be32 *)n, -d);78}79 80static inline u1681fs16_to_cpu(struct super_block *sbp, __fs16 n)82{83 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)84 return le16_to_cpu((__force __le16)n);85 else86 return be16_to_cpu((__force __be16)n);87}88 89static inline __fs1690cpu_to_fs16(struct super_block *sbp, u16 n)91{92 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)93 return (__force __fs16)cpu_to_le16(n);94 else95 return (__force __fs16)cpu_to_be16(n);96}97 98static inline void99fs16_add(struct super_block *sbp, __fs16 *n, int d)100{101 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)102 le16_add_cpu((__le16 *)n, d);103 else104 be16_add_cpu((__be16 *)n, d);105}106 107static inline void108fs16_sub(struct super_block *sbp, __fs16 *n, int d)109{110 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)111 le16_add_cpu((__le16 *)n, -d);112 else113 be16_add_cpu((__be16 *)n, -d);114}115 116#endif /* _UFS_SWAB_H */117