LXR linux/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
  15static inline u64
  16fs64_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
  24static inline fs64
  25cpu_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
  33static inline u32
  34fs32_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
  42static inline fs32
  43cpu_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
  51static inline u16
  52fs16_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
  60static inline fs16
  61cpu_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
  71static inline befs_block_run
  72fsrun_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
  88static inline befs_disk_block_run
  89cpu_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
 105static inline befs_data_stream
 106fsds_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
 127