release/src-rt-6.x.4708/linux/linux-2.6.36/fs/befs/endian.h

   1 /*
   2  * linux/fs/befs/endian.h
   3  *
   4  * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
   5  *
   6  * Partially based on similar funtions in the sysv driver.
   7  */
   8
   9 #ifndef LINUX_BEFS_ENDIAN
  10 #define LINUX_BEFS_ENDIAN
  11
  12 #include <asm/byteorder.h>
  13
  14 static inline u64
  15 fs64_to_cpu(const struct super_block *sb, fs64 n)
  16 {
  17         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  18                 return le64_to_cpu((__force __le64)n);
  19         else
  20                 return be64_to_cpu((__force __be64)n);
  21 }
  22
  23 static inline fs64
  24 cpu_to_fs64(const struct super_block *sb, u64 n)
  25 {
  26         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  27                 return (__force fs64)cpu_to_le64(n);
  28         else
  29                 return (__force fs64)cpu_to_be64(n);
  30 }
  31
  32 static inline u32
  33 fs32_to_cpu(const struct super_block *sb, fs32 n)
  34 {
  35         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  36                 return le32_to_cpu((__force __le32)n);
  37         else
  38                 return be32_to_cpu((__force __be32)n);
  39 }
  40
  41 static inline fs32
  42 cpu_to_fs32(const struct super_block *sb, u32 n)
  43 {
  44         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  45                 return (__force fs32)cpu_to_le32(n);
  46         else
  47                 return (__force fs32)cpu_to_be32(n);
  48 }
  49
  50 static inline u16
  51 fs16_to_cpu(const struct super_block *sb, fs16 n)
  52 {
  53         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  54                 return le16_to_cpu((__force __le16)n);
  55         else
  56                 return be16_to_cpu((__force __be16)n);
  57 }
  58
  59 static inline fs16
  60 cpu_to_fs16(const struct super_block *sb, u16 n)
  61 {
  62         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  63                 return (__force fs16)cpu_to_le16(n);
  64         else
  65                 return (__force fs16)cpu_to_be16(n);
  66 }
  67
  68 /* Composite types below here */
  69
  70 static inline befs_block_run
  71 fsrun_to_cpu(const struct super_block *sb, befs_disk_block_run n)
  72 {
  73         befs_block_run run;
  74
  75         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
  76                 run.allocation_group = le32_to_cpu((__force __le32)n.allocation_group);
  77                 run.start = le16_to_cpu((__force __le16)n.start);
  78                 run.len = le16_to_cpu((__force __le16)n.len);
  79         } else {
  80                 run.allocation_group = be32_to_cpu((__force __be32)n.allocation_group);
  81                 run.start = be16_to_cpu((__force __be16)n.start);
  82                 run.len = be16_to_cpu((__force __be16)n.len);
  83         }
  84         return run;
  85 }
  86
  87 static inline befs_disk_block_run
  88 cpu_to_fsrun(const struct super_block *sb, befs_block_run n)
  89 {
  90         befs_disk_block_run run;
  91
  92         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
  93                 run.allocation_group = cpu_to_le32(n.allocation_group);
  94                 run.start = cpu_to_le16(n.start);
  95                 run.len = cpu_to_le16(n.len);
  96         } else {
  97                 run.allocation_group = cpu_to_be32(n.allocation_group);
  98                 run.start = cpu_to_be16(n.start);
  99                 run.len = cpu_to_be16(n.len);
 100         }
 101         return run;
 102 }
 103
 104 static inline befs_data_stream
 105 fsds_to_cpu(const struct super_block *sb, befs_disk_data_stream n)
 106 {
 107         befs_data_stream data;
 108         int i;
 109
 110         for (i = 0; i < BEFS_NUM_DIRECT_BLOCKS; ++i)
 111                 data.direct[i] = fsrun_to_cpu(sb, n.direct[i]);
 112
 113         data.max_direct_range = fs64_to_cpu(sb, n.max_direct_range);
 114         data.indirect = fsrun_to_cpu(sb, n.indirect);
 115         data.max_indirect_range = fs64_to_cpu(sb, n.max_indirect_range);
 116         data.double_indirect = fsrun_to_cpu(sb, n.double_indirect);
 117         data.max_double_indirect_range = fs64_to_cpu(sb,
 118                                                      n.
 119                                                      max_double_indirect_range);
 120         data.size = fs64_to_cpu(sb, n.size);
 121
 122         return data;
 123 }
 124
 125 #endif                          //LINUX_BEFS_ENDIAN