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1 | /* |
2 | * linux/fs/ufs/swab.h |
3 | * |
4 | * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org> |
5 | * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz> |
6 | * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org> |
7 | */ |
8 | |
9 | #ifndef _UFS_SWAB_H |
10 | #define _UFS_SWAB_H |
11 | |
12 | /* |
13 | * Notes: |
14 | * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes |
15 | * in case there are ufs implementations that have strange bytesexes, |
16 | * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h |
17 | * to support them. |
18 | */ |
19 | |
20 | enum { |
21 | BYTESEX_LE, |
22 | BYTESEX_BE |
23 | }; |
24 | |
25 | static inline u64 |
26 | fs64_to_cpu(struct super_block *sbp, __fs64 n) |
27 | { |
28 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
29 | return le64_to_cpu((__force __le64)n); |
30 | else |
31 | return be64_to_cpu((__force __be64)n); |
32 | } |
33 | |
34 | static inline __fs64 |
35 | cpu_to_fs64(struct super_block *sbp, u64 n) |
36 | { |
37 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
38 | return (__force __fs64)cpu_to_le64(n); |
39 | else |
40 | return (__force __fs64)cpu_to_be64(n); |
41 | } |
42 | |
43 | static inline u32 |
44 | fs32_to_cpu(struct super_block *sbp, __fs32 n) |
45 | { |
46 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
47 | return le32_to_cpu((__force __le32)n); |
48 | else |
49 | return be32_to_cpu((__force __be32)n); |
50 | } |
51 | |
52 | static inline __fs32 |
53 | cpu_to_fs32(struct super_block *sbp, u32 n) |
54 | { |
55 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
56 | return (__force __fs32)cpu_to_le32(n); |
57 | else |
58 | return (__force __fs32)cpu_to_be32(n); |
59 | } |
60 | |
61 | static inline void |
62 | fs32_add(struct super_block *sbp, __fs32 *n, int d) |
63 | { |
64 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
65 | le32_add_cpu((__le32 *)n, d); |
66 | else |
67 | be32_add_cpu((__be32 *)n, d); |
68 | } |
69 | |
70 | static inline void |
71 | fs32_sub(struct super_block *sbp, __fs32 *n, int d) |
72 | { |
73 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
74 | le32_add_cpu((__le32 *)n, -d); |
75 | else |
76 | be32_add_cpu((__be32 *)n, -d); |
77 | } |
78 | |
79 | static inline u16 |
80 | fs16_to_cpu(struct super_block *sbp, __fs16 n) |
81 | { |
82 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
83 | return le16_to_cpu((__force __le16)n); |
84 | else |
85 | return be16_to_cpu((__force __be16)n); |
86 | } |
87 | |
88 | static inline __fs16 |
89 | cpu_to_fs16(struct super_block *sbp, u16 n) |
90 | { |
91 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
92 | return (__force __fs16)cpu_to_le16(n); |
93 | else |
94 | return (__force __fs16)cpu_to_be16(n); |
95 | } |
96 | |
97 | static inline void |
98 | fs16_add(struct super_block *sbp, __fs16 *n, int d) |
99 | { |
100 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
101 | le16_add_cpu((__le16 *)n, d); |
102 | else |
103 | be16_add_cpu((__be16 *)n, d); |
104 | } |
105 | |
106 | static inline void |
107 | fs16_sub(struct super_block *sbp, __fs16 *n, int d) |
108 | { |
109 | if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) |
110 | le16_add_cpu((__le16 *)n, -d); |
111 | else |
112 | be16_add_cpu((__be16 *)n, -d); |
113 | } |
114 | |
115 | #endif /* _UFS_SWAB_H */ |
116 |
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