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