swab.h
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上传日期:2013-04-10
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文件大小:3k
- /*
- * 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, u64 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return le64_to_cpu(n);
- else
- return be64_to_cpu(n);
- }
- static __inline u64
- cpu_to_fs64(struct super_block *sbp, u64 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return cpu_to_le64(n);
- else
- return cpu_to_be64(n);
- }
- static __inline u32
- fs64_add(struct super_block *sbp, u32 *n, int d)
- {
- if (sbp->u.ufs_sb.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 (sbp->u.ufs_sb.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, u32 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return le32_to_cpu(n);
- else
- return be32_to_cpu(n);
- }
- static __inline u32
- cpu_to_fs32(struct super_block *sbp, u32 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return cpu_to_le32(n);
- else
- return cpu_to_be32(n);
- }
- static __inline u32
- fs32_add(struct super_block *sbp, u32 *n, int d)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return *n = cpu_to_le32(le32_to_cpu(*n)+d);
- else
- return *n = cpu_to_be32(be32_to_cpu(*n)+d);
- }
- static __inline u32
- fs32_sub(struct super_block *sbp, u32 *n, int d)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return *n = cpu_to_le32(le32_to_cpu(*n)-d);
- else
- return *n = cpu_to_be32(be32_to_cpu(*n)-d);
- }
- static __inline u16
- fs16_to_cpu(struct super_block *sbp, u16 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return le16_to_cpu(n);
- else
- return be16_to_cpu(n);
- }
- static __inline u16
- cpu_to_fs16(struct super_block *sbp, u16 n)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return cpu_to_le16(n);
- else
- return cpu_to_be16(n);
- }
- static __inline u16
- fs16_add(struct super_block *sbp, u16 *n, int d)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return *n = cpu_to_le16(le16_to_cpu(*n)+d);
- else
- return *n = cpu_to_be16(be16_to_cpu(*n)+d);
- }
- static __inline u16
- fs16_sub(struct super_block *sbp, u16 *n, int d)
- {
- if (sbp->u.ufs_sb.s_bytesex == BYTESEX_LE)
- return *n = cpu_to_le16(le16_to_cpu(*n)-d);
- else
- return *n = cpu_to_be16(be16_to_cpu(*n)-d);
- }
- #endif /* _UFS_SWAB_H */