LXR linux/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
  14static inline u64
  15fs64_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
  23static inline fs64
  24cpu_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
  32static inline u32
  33fs32_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
  41static inline fs32
  42cpu_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
  50static inline u16
  51fs16_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
  59static inline fs16
  60cpu_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
  70static inline befs_block_run
  71fsrun_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
  87static inline befs_disk_block_run
  88cpu_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
 104static inline befs_data_stream
 105fsds_to_cpu(const struct super_block *sb, const 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
 126