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
21enum {
22	BYTESEX_LE,
23	BYTESEX_BE
24};
25
26static inline u64
27fs64_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
35static inline __fs64
36cpu_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
44static inline u32
45fs32_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
53static inline __fs32
54cpu_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
62static inline void
63fs32_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
71static inline void
72fs32_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
80static inline u16
81fs16_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
89static inline __fs16
90cpu_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
98static inline void
99fs16_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
107static inline void
108fs16_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