diff options
Diffstat (limited to 'fs/ufs/swab.h')
| -rw-r--r-- | fs/ufs/swab.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/fs/ufs/swab.h b/fs/ufs/swab.h new file mode 100644 index 00000000000..1683d2bee61 --- /dev/null +++ b/fs/ufs/swab.h @@ -0,0 +1,133 @@ +/* + * linux/fs/ufs/swab.h + * + * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org> + * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz> + * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org> + */ + +#ifndef _UFS_SWAB_H +#define _UFS_SWAB_H + +/* + * Notes: + * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes + * in case there are ufs implementations that have strange bytesexes, + * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h + * to support them. + */ + +enum { + BYTESEX_LE, + BYTESEX_BE +}; + +static inline u64 +fs64_to_cpu(struct super_block *sbp, __fs64 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return le64_to_cpu((__force __le64)n); + else + return be64_to_cpu((__force __be64)n); +} + +static inline __fs64 +cpu_to_fs64(struct super_block *sbp, u64 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return (__force __fs64)cpu_to_le64(n); + else + return (__force __fs64)cpu_to_be64(n); +} + +static __inline u32 +fs64_add(struct super_block *sbp, u32 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return *n = cpu_to_le64(le64_to_cpu(*n)+d); + else + return *n = cpu_to_be64(be64_to_cpu(*n)+d); +} + +static __inline u32 +fs64_sub(struct super_block *sbp, u32 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return *n = cpu_to_le64(le64_to_cpu(*n)-d); + else + return *n = cpu_to_be64(be64_to_cpu(*n)-d); +} + +static __inline u32 +fs32_to_cpu(struct super_block *sbp, __fs32 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return le32_to_cpu((__force __le32)n); + else + return be32_to_cpu((__force __be32)n); +} + +static inline __fs32 +cpu_to_fs32(struct super_block *sbp, u32 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return (__force __fs32)cpu_to_le32(n); + else + return (__force __fs32)cpu_to_be32(n); +} + +static inline void +fs32_add(struct super_block *sbp, __fs32 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)+d); + else + *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)+d); +} + +static inline void +fs32_sub(struct super_block *sbp, __fs32 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)-d); + else + *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)-d); +} + +static inline u16 +fs16_to_cpu(struct super_block *sbp, __fs16 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return le16_to_cpu((__force __le16)n); + else + return be16_to_cpu((__force __be16)n); +} + +static inline __fs16 +cpu_to_fs16(struct super_block *sbp, u16 n) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + return (__force __fs16)cpu_to_le16(n); + else + return (__force __fs16)cpu_to_be16(n); +} + +static inline void +fs16_add(struct super_block *sbp, __fs16 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d); + else + *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d); +} + +static inline void +fs16_sub(struct super_block *sbp, __fs16 *n, int d) +{ + if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) + *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)-d); + else + *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)-d); +} + +#endif /* _UFS_SWAB_H */ |