1
2#ifndef _UAPI_LINUX_MSDOS_FS_H
3#define _UAPI_LINUX_MSDOS_FS_H
4
5#include <linux/types.h>
6#include <linux/magic.h>
7#include <asm/byteorder.h>
8
9
10
11
12
13#ifndef SECTOR_SIZE
14#define SECTOR_SIZE 512
15#endif
16#define SECTOR_BITS 9
17#define MSDOS_DPB (MSDOS_DPS)
18#define MSDOS_DPB_BITS 4
19#define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
20#define MSDOS_DPS_BITS 4
21#define MSDOS_LONGNAME 256
22#define CF_LE_W(v) le16_to_cpu(v)
23#define CF_LE_L(v) le32_to_cpu(v)
24#define CT_LE_W(v) cpu_to_le16(v)
25#define CT_LE_L(v) cpu_to_le32(v)
26
27#define MSDOS_ROOT_INO 1
28#define MSDOS_FSINFO_INO 2
29
30#define MSDOS_DIR_BITS 5
31
32
33#define FAT_MAX_DIR_ENTRIES (65536)
34#define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
35
36#define ATTR_NONE 0
37#define ATTR_RO 1
38#define ATTR_HIDDEN 2
39#define ATTR_SYS 4
40#define ATTR_VOLUME 8
41#define ATTR_DIR 16
42#define ATTR_ARCH 32
43
44
45#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
46
47#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
48
49#define CASE_LOWER_BASE 8
50#define CASE_LOWER_EXT 16
51
52#define DELETED_FLAG 0xe5
53#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
54
55#define FAT_LFN_LEN 255
56#define MSDOS_NAME 11
57#define MSDOS_SLOTS 21
58#define MSDOS_DOT ". "
59#define MSDOS_DOTDOT ".. "
60
61
62#define FAT_START_ENT 2
63
64
65#define MAX_FAT12 0xFF4
66#define MAX_FAT16 0xFFF4
67#define MAX_FAT32 0x0FFFFFF6
68
69
70#define BAD_FAT12 0xFF7
71#define BAD_FAT16 0xFFF7
72#define BAD_FAT32 0x0FFFFFF7
73
74
75#define EOF_FAT12 0xFFF
76#define EOF_FAT16 0xFFFF
77#define EOF_FAT32 0x0FFFFFFF
78
79#define FAT_ENT_FREE (0)
80#define FAT_ENT_BAD (BAD_FAT32)
81#define FAT_ENT_EOF (EOF_FAT32)
82
83#define FAT_FSINFO_SIG1 0x41615252
84#define FAT_FSINFO_SIG2 0x61417272
85#define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
86 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
87
88#define FAT_STATE_DIRTY 0x01
89
90struct __fat_dirent {
91 long d_ino;
92 __kernel_off_t d_off;
93 unsigned short d_reclen;
94 char d_name[256];
95};
96
97
98
99
100#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2])
101#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2])
102
103#define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
104#define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)
105
106#define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32)
107
108struct fat_boot_sector {
109 __u8 ignored[3];
110 __u8 system_id[8];
111
112 __u8 sector_size[2];
113 __u8 sec_per_clus;
114 __le16 reserved;
115 __u8 fats;
116 __u8 dir_entries[2];
117 __u8 sectors[2];
118 __u8 media;
119 __le16 fat_length;
120 __le16 secs_track;
121 __le16 heads;
122 __le32 hidden;
123 __le32 total_sect;
124
125 union {
126 struct {
127
128 __u8 drive_number;
129 __u8 state;
130
131 __u8 signature;
132 __u8 vol_id[4];
133 __u8 vol_label[MSDOS_NAME];
134 __u8 fs_type[8];
135
136 } fat16;
137
138 struct {
139
140 __le32 length;
141 __le16 flags;
142
143 __u8 version[2];
144
145 __le32 root_cluster;
146
147 __le16 info_sector;
148 __le16 backup_boot;
149 __le16 reserved2[6];
150
151 __u8 drive_number;
152 __u8 state;
153
154 __u8 signature;
155 __u8 vol_id[4];
156 __u8 vol_label[MSDOS_NAME];
157 __u8 fs_type[8];
158
159 } fat32;
160 };
161};
162
163struct fat_boot_fsinfo {
164 __le32 signature1;
165 __le32 reserved1[120];
166 __le32 signature2;
167 __le32 free_clusters;
168 __le32 next_cluster;
169 __le32 reserved2[4];
170};
171
172struct msdos_dir_entry {
173 __u8 name[MSDOS_NAME];
174 __u8 attr;
175 __u8 lcase;
176 __u8 ctime_cs;
177 __le16 ctime;
178 __le16 cdate;
179 __le16 adate;
180 __le16 starthi;
181 __le16 time,date,start;
182 __le32 size;
183};
184
185
186struct msdos_dir_slot {
187 __u8 id;
188 __u8 name0_4[10];
189 __u8 attr;
190 __u8 reserved;
191 __u8 alias_checksum;
192 __u8 name5_10[12];
193 __le16 start;
194 __u8 name11_12[4];
195};
196
197#endif
198