git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 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 | ||
| 36a53ddf | 43 | static inline u32 |
| 1da177e4 LT |
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) | |
| 3c5afae2 | 65 | le32_add_cpu((__le32 *)n, d); |
| 1da177e4 | 66 | else |
| 3c5afae2 | 67 | be32_add_cpu((__be32 *)n, d); |
| 1da177e4 LT |
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) | |
| 3c5afae2 | 74 | le32_add_cpu((__le32 *)n, -d); |
| 1da177e4 | 75 | else |
| 3c5afae2 | 76 | be32_add_cpu((__be32 *)n, -d); |
| 1da177e4 LT |
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) | |
| 3c5afae2 | 101 | le16_add_cpu((__le16 *)n, d); |
| 1da177e4 | 102 | else |
| 3c5afae2 | 103 | be16_add_cpu((__be16 *)n, d); |
| 1da177e4 LT |
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) | |
| 3c5afae2 | 110 | le16_add_cpu((__le16 *)n, -d); |
| 1da177e4 | 111 | else |
| 3c5afae2 | 112 | be16_add_cpu((__be16 *)n, -d); |
| 1da177e4 LT |
113 | } |
| 114 | ||
| 115 | #endif /* _UFS_SWAB_H */ |