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
fs64_to_cpu(const struct super_block * sb,fs64 n)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
cpu_to_fs64(const struct super_block * sb,u64 n)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
fs32_to_cpu(const struct super_block * sb,fs32 n)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
cpu_to_fs32(const struct super_block * sb,u32 n)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
fs16_to_cpu(const struct super_block * sb,fs16 n)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
cpu_to_fs16(const struct super_block * sb,u16 n)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
fsrun_to_cpu(const struct super_block * sb,befs_disk_block_run n)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
cpu_to_fsrun(const struct super_block * sb,befs_block_run n)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
fsds_to_cpu(const struct super_block * sb,const befs_disk_data_stream * n)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
127