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
20enum {
21	BYTESEX_LE,
22	BYTESEX_BE
23};
24
25static inline u64
26fs64_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
34static inline __fs64
35cpu_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
43static __inline u32
44fs64_add(struct super_block *sbp, u32 *n, int d)
45{
46	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
47		return *n = cpu_to_le64(le64_to_cpu(*n)+d);
48	else
49		return *n = cpu_to_be64(be64_to_cpu(*n)+d);
50}
51
52static __inline u32
53fs64_sub(struct super_block *sbp, u32 *n, int d)
54{
55	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
56		return *n = cpu_to_le64(le64_to_cpu(*n)-d);
57	else
58		return *n = cpu_to_be64(be64_to_cpu(*n)-d);
59}
60
61static __inline u32
62fs32_to_cpu(struct super_block *sbp, __fs32 n)
63{
64	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
65		return le32_to_cpu((__force __le32)n);
66	else
67		return be32_to_cpu((__force __be32)n);
68}
69
70static inline __fs32
71cpu_to_fs32(struct super_block *sbp, u32 n)
72{
73	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
74		return (__force __fs32)cpu_to_le32(n);
75	else
76		return (__force __fs32)cpu_to_be32(n);
77}
78
79static inline void
80fs32_add(struct super_block *sbp, __fs32 *n, int d)
81{
82	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
83		*(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)+d);
84	else
85		*(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)+d);
86}
87
88static inline void
89fs32_sub(struct super_block *sbp, __fs32 *n, int d)
90{
91	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
92		*(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)-d);
93	else
94		*(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)-d);
95}
96
97static inline u16
98fs16_to_cpu(struct super_block *sbp, __fs16 n)
99{
100	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
101		return le16_to_cpu((__force __le16)n);
102	else
103		return be16_to_cpu((__force __be16)n);
104}
105
106static inline __fs16
107cpu_to_fs16(struct super_block *sbp, u16 n)
108{
109	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
110		return (__force __fs16)cpu_to_le16(n);
111	else
112		return (__force __fs16)cpu_to_be16(n);
113}
114
115static inline void
116fs16_add(struct super_block *sbp, __fs16 *n, int d)
117{
118	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
119		*(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d);
120	else
121		*(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d);
122}
123
124static inline void
125fs16_sub(struct super_block *sbp, __fs16 *n, int d)
126{
127	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
128		*(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)-d);
129	else
130		*(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)-d);
131}
132
133#endif /* _UFS_SWAB_H */
134