xref: /openbmc/linux/fs/ufs/swab.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  linux/fs/ufs/swab.h
4  *
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_H
11 #define _UFS_SWAB_H
12 
13 /*
14  * Notes:
15  *    HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
16  *    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.h
18  *    to support them.
19  */
20 
21 enum {
22 	BYTESEX_LE,
23 	BYTESEX_BE
24 };
25 
26 static inline u64
fs64_to_cpu(struct super_block * sbp,__fs64 n)27 fs64_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 	else
32 		return be64_to_cpu((__force __be64)n);
33 }
34 
35 static inline __fs64
cpu_to_fs64(struct super_block * sbp,u64 n)36 cpu_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 	else
41 		return (__force __fs64)cpu_to_be64(n);
42 }
43 
44 static inline u32
fs32_to_cpu(struct super_block * sbp,__fs32 n)45 fs32_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 	else
50 		return be32_to_cpu((__force __be32)n);
51 }
52 
53 static inline __fs32
cpu_to_fs32(struct super_block * sbp,u32 n)54 cpu_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 	else
59 		return (__force __fs32)cpu_to_be32(n);
60 }
61 
62 static inline void
fs32_add(struct super_block * sbp,__fs32 * n,int d)63 fs32_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 	else
68 		be32_add_cpu((__be32 *)n, d);
69 }
70 
71 static inline void
fs32_sub(struct super_block * sbp,__fs32 * n,int d)72 fs32_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 	else
77 		be32_add_cpu((__be32 *)n, -d);
78 }
79 
80 static inline u16
fs16_to_cpu(struct super_block * sbp,__fs16 n)81 fs16_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 	else
86 		return be16_to_cpu((__force __be16)n);
87 }
88 
89 static inline __fs16
cpu_to_fs16(struct super_block * sbp,u16 n)90 cpu_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 	else
95 		return (__force __fs16)cpu_to_be16(n);
96 }
97 
98 static inline void
fs16_add(struct super_block * sbp,__fs16 * n,int d)99 fs16_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 	else
104 		be16_add_cpu((__be16 *)n, d);
105 }
106 
107 static inline void
fs16_sub(struct super_block * sbp,__fs16 * n,int d)108 fs16_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 	else
113 		be16_add_cpu((__be16 *)n, -d);
114 }
115 
116 #endif /* _UFS_SWAB_H */
117