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Diffstat (limited to 'fs/ufs/ufs_swab.h')
| -rw-r--r-- | fs/ufs/ufs_swab.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/ufs/ufs_swab.h b/fs/ufs/ufs_swab.h new file mode 100644 index 000000000..921fb3d79 --- /dev/null +++ b/fs/ufs/ufs_swab.h @@ -0,0 +1,59 @@ +/* + * linux/fs/ufs/ufs_swab.h + * + * Copyright (C) 1997 + * Francois-Rene Rideau <rideau@ens.fr> + * + */ + +#ifndef _UFS_SWAB_H +#define _UFS_SWAB_H + + +/* + * Notes: + * (1) 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. + * (2) for a read/write ufs driver, we should distinguish + * between byteswapping for read or write accesses! + */ + +#include <linux/ufs_fs.h> +#include <asm/byteorder.h> + +/* + * These are only valid inside ufs routines, + * after bytesex has been initialized to sb->u.ufs_sb.s_flags&UFS_BYTESEX + */ +#define SWAB16(x) ufs_swab16(bytesex,x) +#define SWAB32(x) ufs_swab32(bytesex,x) +#define SWAB64(x) ufs_swab64(bytesex,x) + +extern __inline__ __const__ __u16 ufs_swab16(__u32 bytesex, __u16 x) { + if (bytesex == UFS_LITTLE_ENDIAN) { + return le16_to_cpu(x); + } else { + return be16_to_cpu(x); + } +} +extern __inline__ __const__ __u32 ufs_swab32(__u32 bytesex, __u32 x) { + if (bytesex == UFS_LITTLE_ENDIAN) { + return le32_to_cpu(x); + } else { + return be32_to_cpu(x); + } +} +extern __inline__ __const__ __u64 ufs_swab64(__u32 bytesex, __u64 x) { + if (bytesex == UFS_LITTLE_ENDIAN) { + return le64_to_cpu(x); + } else { + return be64_to_cpu(x); + } +} + +extern void ufs_superblock_le_to_cpus(struct ufs_superblock * usb); +extern void ufs_superblock_be_to_cpus(struct ufs_superblock * usb); + +#endif /* _UFS_SWAB_H */ |