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 */