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
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
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
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
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
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
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
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
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
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
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
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