fs/ufs/swab.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  linux/fs/ufs/swab.h
   4  *
   5  * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org>
   6  * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>
   7  * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org>
   8  */
   9
  10 #ifndef _UFS_SWAB_H
  11 #define _UFS_SWAB_H
  12
  13 /*
  14  * Notes:
  15  *    HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
  16  *    in case there are ufs implementations that have strange bytesexes,
  17  *    you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
  18  *    to support them.
  19  */
  20
  21 enum {
  22         BYTESEX_LE,
  23         BYTESEX_BE
  24 };
  25
  26 static inline u64
  27 fs64_to_cpu(struct super_block *sbp, __fs64 n)
  28 {
  29         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  30                 return le64_to_cpu((__force __le64)n);
  31         else
  32                 return be64_to_cpu((__force __be64)n);
  33 }
  34
  35 static inline __fs64
  36 cpu_to_fs64(struct super_block *sbp, u64 n)
  37 {
  38         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  39                 return (__force __fs64)cpu_to_le64(n);
  40         else
  41                 return (__force __fs64)cpu_to_be64(n);
  42 }
  43
  44 static inline u32
  45 fs32_to_cpu(struct super_block *sbp, __fs32 n)
  46 {
  47         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  48                 return le32_to_cpu((__force __le32)n);
  49         else
  50                 return be32_to_cpu((__force __be32)n);
  51 }
  52
  53 static inline __fs32
  54 cpu_to_fs32(struct super_block *sbp, u32 n)
  55 {
  56         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  57                 return (__force __fs32)cpu_to_le32(n);
  58         else
  59                 return (__force __fs32)cpu_to_be32(n);
  60 }
  61
  62 static inline void
  63 fs32_add(struct super_block *sbp, __fs32 *n, int d)
  64 {
  65         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  66                 le32_add_cpu((__le32 *)n, d);
  67         else
  68                 be32_add_cpu((__be32 *)n, d);
  69 }
  70
  71 static inline void
  72 fs32_sub(struct super_block *sbp, __fs32 *n, int d)
  73 {
  74         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  75                 le32_add_cpu((__le32 *)n, -d);
  76         else
  77                 be32_add_cpu((__be32 *)n, -d);
  78 }
  79
  80 static inline u16
  81 fs16_to_cpu(struct super_block *sbp, __fs16 n)
  82 {
  83         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  84                 return le16_to_cpu((__force __le16)n);
  85         else
  86                 return be16_to_cpu((__force __be16)n);
  87 }
  88
  89 static inline __fs16
  90 cpu_to_fs16(struct super_block *sbp, u16 n)
  91 {
  92         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  93                 return (__force __fs16)cpu_to_le16(n);
  94         else
  95                 return (__force __fs16)cpu_to_be16(n);
  96 }
  97
  98 static inline void
  99 fs16_add(struct super_block *sbp, __fs16 *n, int d)
 100 {
 101         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 102                 le16_add_cpu((__le16 *)n, d);
 103         else
 104                 be16_add_cpu((__be16 *)n, d);
 105 }
 106
 107 static inline void
 108 fs16_sub(struct super_block *sbp, __fs16 *n, int d)
 109 {
 110         if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
 111                 le16_add_cpu((__le16 *)n, -d);
 112         else
 113                 be16_add_cpu((__be16 *)n, -d);
 114 }
 115
 116 #endif /* _UFS_SWAB_H */