1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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 | * The MS-DOS filesystem constants/structures |
11 | */ |
12 | |
13 | #ifndef SECTOR_SIZE |
14 | #define SECTOR_SIZE 512 /* sector size (bytes) */ |
15 | #endif |
16 | #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ |
17 | #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ |
18 | #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ |
19 | #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) |
20 | #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ |
21 | #define MSDOS_LONGNAME 256 /* maximum name length */ |
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 /* The root inode number */ |
28 | #define MSDOS_FSINFO_INO 2 /* Used for managing the FSINFO block */ |
29 | |
30 | #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ |
31 | |
32 | /* directory limit */ |
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 /* no attribute bits */ |
37 | #define ATTR_RO 1 /* read-only */ |
38 | #define ATTR_HIDDEN 2 /* hidden */ |
39 | #define ATTR_SYS 4 /* system */ |
40 | #define ATTR_VOLUME 8 /* volume label */ |
41 | #define ATTR_DIR 16 /* directory */ |
42 | #define ATTR_ARCH 32 /* archived */ |
43 | |
44 | /* attribute bits that are copied "as is" */ |
45 | #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) |
46 | /* bits that are used by the Windows 95/Windows NT extended FAT */ |
47 | #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) |
48 | |
49 | #define CASE_LOWER_BASE 8 /* base is lower case */ |
50 | #define CASE_LOWER_EXT 16 /* extension is lower case */ |
51 | |
52 | #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ |
53 | #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) |
54 | |
55 | #define FAT_LFN_LEN 255 /* maximum long name length */ |
56 | #define MSDOS_NAME 11 /* maximum name length */ |
57 | #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ |
58 | #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ |
59 | #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ |
60 | |
61 | /* start of data cluster's entry (number of reserved clusters) */ |
62 | #define FAT_START_ENT 2 |
63 | |
64 | /* maximum number of clusters */ |
65 | #define MAX_FAT12 0xFF4 |
66 | #define MAX_FAT16 0xFFF4 |
67 | #define MAX_FAT32 0x0FFFFFF6 |
68 | |
69 | /* bad cluster mark */ |
70 | #define BAD_FAT12 0xFF7 |
71 | #define BAD_FAT16 0xFFF7 |
72 | #define BAD_FAT32 0x0FFFFFF7 |
73 | |
74 | /* standard EOF */ |
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 | |
90 | struct __fat_dirent { |
91 | long d_ino; |
92 | __kernel_off_t d_off; |
93 | unsigned short d_reclen; |
94 | char d_name[256]; /* We must not include limits.h! */ |
95 | }; |
96 | |
97 | /* |
98 | * ioctl commands |
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 | /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ |
103 | #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) |
104 | #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) |
105 | /*Android kernel has used 0x12, so we use 0x13*/ |
106 | #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32) |
107 | |
108 | struct fat_boot_sector { |
109 | __u8 ignored[3]; /* Boot strap short or near jump */ |
110 | __u8 system_id[8]; /* Name - can be used to special case |
111 | partition manager volumes */ |
112 | __u8 sector_size[2]; /* bytes per logical sector */ |
113 | __u8 sec_per_clus; /* sectors/cluster */ |
114 | __le16 reserved; /* reserved sectors */ |
115 | __u8 fats; /* number of FATs */ |
116 | __u8 dir_entries[2]; /* root directory entries */ |
117 | __u8 sectors[2]; /* number of sectors */ |
118 | __u8 media; /* media code */ |
119 | __le16 fat_length; /* sectors/FAT */ |
120 | __le16 secs_track; /* sectors per track */ |
121 | __le16 heads; /* number of heads */ |
122 | __le32 hidden; /* hidden sectors (unused) */ |
123 | __le32 total_sect; /* number of sectors (if sectors == 0) */ |
124 | |
125 | union { |
126 | struct { |
127 | /* Extended BPB Fields for FAT16 */ |
128 | __u8 drive_number; /* Physical drive number */ |
129 | __u8 state; /* undocumented, but used |
130 | for mount state. */ |
131 | __u8 signature; /* extended boot signature */ |
132 | __u8 vol_id[4]; /* volume ID */ |
133 | __u8 vol_label[MSDOS_NAME]; /* volume label */ |
134 | __u8 fs_type[8]; /* file system type */ |
135 | /* other fields are not added here */ |
136 | } fat16; |
137 | |
138 | struct { |
139 | /* only used by FAT32 */ |
140 | __le32 length; /* sectors/FAT */ |
141 | __le16 flags; /* bit 8: fat mirroring, |
142 | low 4: active fat */ |
143 | __u8 version[2]; /* major, minor filesystem |
144 | version */ |
145 | __le32 root_cluster; /* first cluster in |
146 | root directory */ |
147 | __le16 info_sector; /* filesystem info sector */ |
148 | __le16 backup_boot; /* backup boot sector */ |
149 | __le16 reserved2[6]; /* Unused */ |
150 | /* Extended BPB Fields for FAT32 */ |
151 | __u8 drive_number; /* Physical drive number */ |
152 | __u8 state; /* undocumented, but used |
153 | for mount state. */ |
154 | __u8 signature; /* extended boot signature */ |
155 | __u8 vol_id[4]; /* volume ID */ |
156 | __u8 vol_label[MSDOS_NAME]; /* volume label */ |
157 | __u8 fs_type[8]; /* file system type */ |
158 | /* other fields are not added here */ |
159 | } fat32; |
160 | }; |
161 | }; |
162 | |
163 | struct fat_boot_fsinfo { |
164 | __le32 signature1; /* 0x41615252L */ |
165 | __le32 reserved1[120]; /* Nothing as far as I can tell */ |
166 | __le32 signature2; /* 0x61417272L */ |
167 | __le32 free_clusters; /* Free cluster count. -1 if unknown */ |
168 | __le32 next_cluster; /* Most recently allocated cluster */ |
169 | __le32 reserved2[4]; |
170 | }; |
171 | |
172 | struct msdos_dir_entry { |
173 | __u8 name[MSDOS_NAME];/* name and extension */ |
174 | __u8 attr; /* attribute bits */ |
175 | __u8 lcase; /* Case for base and extension */ |
176 | __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ |
177 | __le16 ctime; /* Creation time */ |
178 | __le16 cdate; /* Creation date */ |
179 | __le16 adate; /* Last access date */ |
180 | __le16 starthi; /* High 16 bits of cluster in FAT32 */ |
181 | __le16 time,date,start;/* time, date and first cluster */ |
182 | __le32 size; /* file size (in bytes) */ |
183 | }; |
184 | |
185 | /* Up to 13 characters of the name */ |
186 | struct msdos_dir_slot { |
187 | __u8 id; /* sequence number for slot */ |
188 | __u8 name0_4[10]; /* first 5 characters in name */ |
189 | __u8 attr; /* attribute byte */ |
190 | __u8 reserved; /* always 0 */ |
191 | __u8 alias_checksum; /* checksum for 8.3 alias */ |
192 | __u8 name5_10[12]; /* 6 more characters in name */ |
193 | __le16 start; /* starting cluster number, 0 in long slots */ |
194 | __u8 name11_12[4]; /* last 2 characters in name */ |
195 | }; |
196 | |
197 | #endif /* _UAPI_LINUX_MSDOS_FS_H */ |
198 | |