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swab.h
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1 /*
2  * linux/fs/ufs/swab.h
3  *
4  * Copyright (C) 1997, 1998 Francois-Rene Rideau <[email protected]>
5  * Copyright (C) 1998 Jakub Jelinek <[email protected]>
6  * Copyright (C) 2001 Christoph Hellwig <[email protected]>
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 */
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