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fs/ufs/swab.h 2.47 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   *  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);
  }
36a53ddf8   Harvey Harrison   ufs: replace __in... 
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  static inline u32
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  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)
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  		le32_add_cpu((__le32 *)n, d);
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  	else
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  		be32_add_cpu((__be32 *)n, d);
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  }
  
  static inline void
  fs32_sub(struct super_block *sbp, __fs32 *n, int d)
  {
  	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
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  		le32_add_cpu((__le32 *)n, -d);
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  	else
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  		be32_add_cpu((__be32 *)n, -d);
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  }
  
  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)
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  		le16_add_cpu((__le16 *)n, d);
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  	else
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  		be16_add_cpu((__be16 *)n, d);
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  }
  
  static inline void
  fs16_sub(struct super_block *sbp, __fs16 *n, int d)
  {
  	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
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  		le16_add_cpu((__le16 *)n, -d);
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  	else
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  		be16_add_cpu((__be16 *)n, -d);
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  }
  
  #endif /* _UFS_SWAB_H */