LXR linux/fs/ufs/swab.h

   1/*
   2 *  linux/fs/ufs/swab.h
   3 *
   4 * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org>
   5 * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>
   6 * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org>
   7 */
   8
   9#ifndef _UFS_SWAB_H
  10#define _UFS_SWAB_H
  11
  12/*
  13 * Notes:
  14 *    HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
  15 *    in case there are ufs implementations that have strange bytesexes,
  16 *    you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
  17 *    to support them.
  18 */
  19
  20enum {
  21        BYTESEX_LE,
  22        BYTESEX_BE
  23};
  24
  25static inline u64
  26fs64_to_cpu(struct super_block *sbp, __fs64 n)
  27{
  28        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  29                return le64_to_cpu((__force __le64)n);
  30        else
  31                return be64_to_cpu((__force __be64)n);
  32}
  33
  34static inline __fs64
  35cpu_to_fs64(struct super_block *sbp, u64 n)
  36{
  37        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  38                return (__force __fs64)cpu_to_le64(n);
  39        else
  40                return (__force __fs64)cpu_to_be64(n);
  41}
  42
  43static __inline u32
  44fs64_add(struct super_block *sbp, u32 *n, int d)
  45{
  46        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  47                return *n = cpu_to_le64(le64_to_cpu(*n)+d);
  48        else
  49                return *n = cpu_to_be64(be64_to_cpu(*n)+d);
  50}
  51
  52static __inline u32
  53fs64_sub(struct super_block *sbp, u32 *n, int d)
  54{
  55        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  56                return *n = cpu_to_le64(le64_to_cpu(*n)-d);
  57        else
  58                return *n = cpu_to_be64(be64_to_cpu(*n)-d);
  59}
  60
  61static __inline u32
  62fs32_to_cpu(struct super_block *sbp, __fs32 n)
  63{
  64        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  65                return le32_to_cpu((__force __le32)n);
  66        else
  67                return be32_to_cpu((__force __be32)n);
  68}
  69
  70static inline __fs32
  71cpu_to_fs32(struct super_block *sbp, u32 n)
  72{
  73        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  74                return (__force __fs32)cpu_to_le32(n);
  75        else
  76                return (__force __fs32)cpu_to_be32(n);
  77}
  78
  79static inline void
  80fs32_add(struct super_block *sbp, __fs32 *n, int d)
  81{
  82        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  83                *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)+d);
  84        else
  85                *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)+d);
  86}
  87
  88static inline void
  89fs32_sub(struct super_block *sbp, __fs32 *n, int d)
  90{
  91        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  92                *(__le32 *)n = cpu_to_le32(le32_to_cpu(*(__le32 *)n)-d);
  93        else
  94                *(__be32 *)n = cpu_to_be32(be32_to_cpu(*(__be32 *)n)-d);
  95}
  96
  97static inline u16
  98fs16_to_cpu(struct super_block *sbp, __fs16 n)
  99{
 100        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 101                return le16_to_cpu((__force __le16)n);
 102        else
 103                return be16_to_cpu((__force __be16)n);
 104}
 105
 106static inline __fs16
 107cpu_to_fs16(struct super_block *sbp, u16 n)
 108{
 109        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 110                return (__force __fs16)cpu_to_le16(n);
 111        else
 112                return (__force __fs16)cpu_to_be16(n);
 113}
 114
 115static inline void
 116fs16_add(struct super_block *sbp, __fs16 *n, int d)
 117{
 118        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 119                *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)+d);
 120        else
 121                *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)+d);
 122}
 123
 124static inline void
 125fs16_sub(struct super_block *sbp, __fs16 *n, int d)
 126{
 127        if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 128                *(__le16 *)n = cpu_to_le16(le16_to_cpu(*(__le16 *)n)-d);
 129        else
 130                *(__be16 *)n = cpu_to_be16(be16_to_cpu(*(__be16 *)n)-d);
 131}
 132
 133#endif /* _UFS_SWAB_H */
 134