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
44fs32_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
52static inline __fs32
53cpu_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
61static inline void
62fs32_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
70static inline void
71fs32_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
79static inline u16
80fs16_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
88static inline __fs16
89cpu_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
97static inline void
98fs16_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
106static inline void
107fs16_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