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1da177e4 LT |
1 | #ifndef _LINUX_MSDOS_FS_H |
2 | #define _LINUX_MSDOS_FS_H | |
3 | ||
8ef34202 | 4 | #include <linux/types.h> |
e18fa700 | 5 | #include <linux/magic.h> |
4596c8aa | 6 | #include <asm/byteorder.h> |
e18fa700 | 7 | |
1da177e4 LT |
8 | /* |
9 | * The MS-DOS filesystem constants/structures | |
10 | */ | |
1da177e4 LT |
11 | |
12 | #define SECTOR_SIZE 512 /* sector size (bytes) */ | |
13 | #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ | |
14 | #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ | |
15 | #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ | |
16 | #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) | |
17 | #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ | |
18 | #define CF_LE_W(v) le16_to_cpu(v) | |
19 | #define CF_LE_L(v) le32_to_cpu(v) | |
20 | #define CT_LE_W(v) cpu_to_le16(v) | |
21 | #define CT_LE_L(v) cpu_to_le32(v) | |
22 | ||
23 | ||
1da177e4 LT |
24 | #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ |
25 | #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ | |
26 | ||
27 | /* directory limit */ | |
28 | #define FAT_MAX_DIR_ENTRIES (65536) | |
29 | #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) | |
30 | ||
31 | #define ATTR_NONE 0 /* no attribute bits */ | |
32 | #define ATTR_RO 1 /* read-only */ | |
33 | #define ATTR_HIDDEN 2 /* hidden */ | |
34 | #define ATTR_SYS 4 /* system */ | |
35 | #define ATTR_VOLUME 8 /* volume label */ | |
36 | #define ATTR_DIR 16 /* directory */ | |
37 | #define ATTR_ARCH 32 /* archived */ | |
38 | ||
39 | /* attribute bits that are copied "as is" */ | |
40 | #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) | |
41 | /* bits that are used by the Windows 95/Windows NT extended FAT */ | |
42 | #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) | |
43 | ||
44 | #define CASE_LOWER_BASE 8 /* base is lower case */ | |
45 | #define CASE_LOWER_EXT 16 /* extension is lower case */ | |
46 | ||
47 | #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ | |
48 | #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) | |
49 | ||
1da177e4 LT |
50 | #define MSDOS_NAME 11 /* maximum name length */ |
51 | #define MSDOS_LONGNAME 256 /* maximum name length */ | |
52 | #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ | |
53 | #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ | |
54 | #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ | |
55 | ||
1da177e4 LT |
56 | #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ |
57 | MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) | |
58 | ||
59 | /* start of data cluster's entry (number of reserved clusters) */ | |
60 | #define FAT_START_ENT 2 | |
61 | ||
62 | /* maximum number of clusters */ | |
63 | #define MAX_FAT12 0xFF4 | |
64 | #define MAX_FAT16 0xFFF4 | |
65 | #define MAX_FAT32 0x0FFFFFF6 | |
66 | #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ | |
67 | MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) | |
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 | ||
4596c8aa OH |
88 | struct __fat_dirent { |
89 | long d_ino; | |
90 | __kernel_off_t d_off; | |
91 | unsigned short d_reclen; | |
92 | char d_name[256]; /* We must not include limits.h! */ | |
93 | }; | |
94 | ||
1da177e4 LT |
95 | /* |
96 | * ioctl commands | |
97 | */ | |
4596c8aa OH |
98 | #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) |
99 | #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) | |
1da177e4 LT |
100 | /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ |
101 | #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) | |
102 | #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) | |
103 | ||
1da177e4 LT |
104 | struct fat_boot_sector { |
105 | __u8 ignored[3]; /* Boot strap short or near jump */ | |
106 | __u8 system_id[8]; /* Name - can be used to special case | |
107 | partition manager volumes */ | |
108 | __u8 sector_size[2]; /* bytes per logical sector */ | |
109 | __u8 sec_per_clus; /* sectors/cluster */ | |
110 | __le16 reserved; /* reserved sectors */ | |
111 | __u8 fats; /* number of FATs */ | |
112 | __u8 dir_entries[2]; /* root directory entries */ | |
113 | __u8 sectors[2]; /* number of sectors */ | |
114 | __u8 media; /* media code */ | |
115 | __le16 fat_length; /* sectors/FAT */ | |
116 | __le16 secs_track; /* sectors per track */ | |
117 | __le16 heads; /* number of heads */ | |
118 | __le32 hidden; /* hidden sectors (unused) */ | |
119 | __le32 total_sect; /* number of sectors (if sectors == 0) */ | |
120 | ||
121 | /* The following fields are only used by FAT32 */ | |
122 | __le32 fat32_length; /* sectors/FAT */ | |
123 | __le16 flags; /* bit 8: fat mirroring, low 4: active fat */ | |
124 | __u8 version[2]; /* major, minor filesystem version */ | |
125 | __le32 root_cluster; /* first cluster in root directory */ | |
126 | __le16 info_sector; /* filesystem info sector */ | |
127 | __le16 backup_boot; /* backup boot sector */ | |
128 | __le16 reserved2[6]; /* Unused */ | |
129 | }; | |
130 | ||
131 | struct fat_boot_fsinfo { | |
132 | __le32 signature1; /* 0x41615252L */ | |
133 | __le32 reserved1[120]; /* Nothing as far as I can tell */ | |
134 | __le32 signature2; /* 0x61417272L */ | |
135 | __le32 free_clusters; /* Free cluster count. -1 if unknown */ | |
136 | __le32 next_cluster; /* Most recently allocated cluster */ | |
137 | __le32 reserved2[4]; | |
138 | }; | |
139 | ||
140 | struct msdos_dir_entry { | |
9aacd599 | 141 | __u8 name[MSDOS_NAME];/* name and extension */ |
1da177e4 LT |
142 | __u8 attr; /* attribute bits */ |
143 | __u8 lcase; /* Case for base and extension */ | |
144 | __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ | |
145 | __le16 ctime; /* Creation time */ | |
146 | __le16 cdate; /* Creation date */ | |
147 | __le16 adate; /* Last access date */ | |
148 | __le16 starthi; /* High 16 bits of cluster in FAT32 */ | |
149 | __le16 time,date,start;/* time, date and first cluster */ | |
150 | __le32 size; /* file size (in bytes) */ | |
151 | }; | |
152 | ||
153 | /* Up to 13 characters of the name */ | |
154 | struct msdos_dir_slot { | |
155 | __u8 id; /* sequence number for slot */ | |
156 | __u8 name0_4[10]; /* first 5 characters in name */ | |
157 | __u8 attr; /* attribute byte */ | |
158 | __u8 reserved; /* always 0 */ | |
159 | __u8 alias_checksum; /* checksum for 8.3 alias */ | |
160 | __u8 name5_10[12]; /* 6 more characters in name */ | |
161 | __le16 start; /* starting cluster number, 0 in long slots */ | |
162 | __u8 name11_12[4]; /* last 2 characters in name */ | |
163 | }; | |
164 | ||
1da177e4 | 165 | #ifdef __KERNEL__ |
f751aa12 AB |
166 | /* media of boot sector */ |
167 | static inline int fat_valid_media(u8 media) | |
168 | { | |
169 | return 0xf8 <= media || media == 0xf0; | |
170 | } | |
9e975dae OH |
171 | #endif /* !__KERNEL__ */ |
172 | #endif /* !_LINUX_MSDOS_FS_H */ |