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
  20 enum {
  21         BYTESEX_LE,
  22         BYTESEX_BE
  23 };
  24
  25 static __inline u64
  26 fs64_to_cpu(struct super_block *sbp, u64 n)
  27 {
  28         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  29                 return le64_to_cpu(n);
  30         else
  31                 return be64_to_cpu(n);
  32 }
  33
  34 static __inline u64
  35 cpu_to_fs64(struct super_block *sbp, u64 n)
  36 {
  37         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  38                 return cpu_to_le64(n);
  39         else
  40                 return cpu_to_be64(n);
  41 }
  42
  43 static __inline u32
  44 fs64_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
  52 static __inline u32
  53 fs64_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
  61 static __inline u32
  62 fs32_to_cpu(struct super_block *sbp, u32 n)
  63 {
  64         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  65                 return le32_to_cpu(n);
  66         else
  67                 return be32_to_cpu(n);
  68 }
  69
  70 static __inline u32
  71 cpu_to_fs32(struct super_block *sbp, u32 n)
  72 {
  73         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  74                 return cpu_to_le32(n);
  75         else
  76                 return cpu_to_be32(n);
  77 }
  78
  79 static __inline u32
  80 fs32_add(struct super_block *sbp, u32 *n, int d)
  81 {
  82         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  83                 return *n = cpu_to_le32(le32_to_cpu(*n)+d);
  84         else
  85                 return *n = cpu_to_be32(be32_to_cpu(*n)+d);
  86 }
  87
  88 static __inline u32
  89 fs32_sub(struct super_block *sbp, u32 *n, int d)
  90 {
  91         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  92                 return *n = cpu_to_le32(le32_to_cpu(*n)-d);
  93         else
  94                 return *n = cpu_to_be32(be32_to_cpu(*n)-d);
  95 }
  96
  97 static __inline u16
  98 fs16_to_cpu(struct super_block *sbp, u16 n)
  99 {
 100         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 101                 return le16_to_cpu(n);
 102         else
 103                 return be16_to_cpu(n);
 104 }
 105
 106 static __inline u16
 107 cpu_to_fs16(struct super_block *sbp, u16 n)
 108 {
 109         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 110                 return cpu_to_le16(n);
 111         else
 112                 return cpu_to_be16(n);
 113 }
 114
 115 static __inline u16
 116 fs16_add(struct super_block *sbp, u16 *n, int d)
 117 {
 118         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 119                 return *n = cpu_to_le16(le16_to_cpu(*n)+d);
 120         else
 121                 return *n = cpu_to_be16(be16_to_cpu(*n)+d);
 122 }
 123
 124 static __inline u16
 125 fs16_sub(struct super_block *sbp, u16 *n, int d)
 126 {
 127         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 128                 return *n = cpu_to_le16(le16_to_cpu(*n)-d);
 129         else
 130                 return *n = cpu_to_be16(be16_to_cpu(*n)-d);
 131 }
 132
 133 #endif /* _UFS_SWAB_H */