fs/befs/endian.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/fs/befs/endian.h
   4  *
   5  * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
   6  *
   7  * Partially based on similar funtions in the sysv driver.
   8  */
   9
  10 #ifndef LINUX_BEFS_ENDIAN
  11 #define LINUX_BEFS_ENDIAN
  12
  13 #include <asm/byteorder.h>
  14
  15 static inline u64
  16 fs64_to_cpu(const struct super_block *sb, fs64 n)
  17 {
  18         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  19                 return le64_to_cpu((__force __le64)n);
  20         else
  21                 return be64_to_cpu((__force __be64)n);
  22 }
  23
  24 static inline fs64
  25 cpu_to_fs64(const struct super_block *sb, u64 n)
  26 {
  27         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  28                 return (__force fs64)cpu_to_le64(n);
  29         else
  30                 return (__force fs64)cpu_to_be64(n);
  31 }
  32
  33 static inline u32
  34 fs32_to_cpu(const struct super_block *sb, fs32 n)
  35 {
  36         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  37                 return le32_to_cpu((__force __le32)n);
  38         else
  39                 return be32_to_cpu((__force __be32)n);
  40 }
  41
  42 static inline fs32
  43 cpu_to_fs32(const struct super_block *sb, u32 n)
  44 {
  45         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  46                 return (__force fs32)cpu_to_le32(n);
  47         else
  48                 return (__force fs32)cpu_to_be32(n);
  49 }
  50
  51 static inline u16
  52 fs16_to_cpu(const struct super_block *sb, fs16 n)
  53 {
  54         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  55                 return le16_to_cpu((__force __le16)n);
  56         else
  57                 return be16_to_cpu((__force __be16)n);
  58 }
  59
  60 static inline fs16
  61 cpu_to_fs16(const struct super_block *sb, u16 n)
  62 {
  63         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
  64                 return (__force fs16)cpu_to_le16(n);
  65         else
  66                 return (__force fs16)cpu_to_be16(n);
  67 }
  68
  69 /* Composite types below here */
  70
  71 static inline befs_block_run
  72 fsrun_to_cpu(const struct super_block *sb, befs_disk_block_run n)
  73 {
  74         befs_block_run run;
  75
  76         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
  77                 run.allocation_group = le32_to_cpu((__force __le32)n.allocation_group);
  78                 run.start = le16_to_cpu((__force __le16)n.start);
  79                 run.len = le16_to_cpu((__force __le16)n.len);
  80         } else {
  81                 run.allocation_group = be32_to_cpu((__force __be32)n.allocation_group);
  82                 run.start = be16_to_cpu((__force __be16)n.start);
  83                 run.len = be16_to_cpu((__force __be16)n.len);
  84         }
  85         return run;
  86 }
  87
  88 static inline befs_disk_block_run
  89 cpu_to_fsrun(const struct super_block *sb, befs_block_run n)
  90 {
  91         befs_disk_block_run run;
  92
  93         if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
  94                 run.allocation_group = cpu_to_le32(n.allocation_group);
  95                 run.start = cpu_to_le16(n.start);
  96                 run.len = cpu_to_le16(n.len);
  97         } else {
  98                 run.allocation_group = cpu_to_be32(n.allocation_group);
  99                 run.start = cpu_to_be16(n.start);
 100                 run.len = cpu_to_be16(n.len);
 101         }
 102         return run;
 103 }
 104
 105 static inline befs_data_stream
 106 fsds_to_cpu(const struct super_block *sb, const befs_disk_data_stream *n)
 107 {
 108         befs_data_stream data;
 109         int i;
 110
 111         for (i = 0; i < BEFS_NUM_DIRECT_BLOCKS; ++i)
 112                 data.direct[i] = fsrun_to_cpu(sb, n->direct[i]);
 113
 114         data.max_direct_range = fs64_to_cpu(sb, n->max_direct_range);
 115         data.indirect = fsrun_to_cpu(sb, n->indirect);
 116         data.max_indirect_range = fs64_to_cpu(sb, n->max_indirect_range);
 117         data.double_indirect = fsrun_to_cpu(sb, n->double_indirect);
 118         data.max_double_indirect_range = fs64_to_cpu(sb,
 119                                                      n->
 120                                                      max_double_indirect_range);
 121         data.size = fs64_to_cpu(sb, n->size);
 122
 123         return data;
 124 }
 125
 126 #endif                          //LINUX_BEFS_ENDIAN