|
1 #ifndef _LINUX_MSDOS_FS_H |
|
2 #define _LINUX_MSDOS_FS_H |
|
3 |
|
4 #include <linux/magic.h> |
|
5 #include <asm/byteorder.h> |
|
6 |
|
7 /* |
|
8 * The MS-DOS filesystem constants/structures |
|
9 */ |
|
10 |
|
11 #define SECTOR_SIZE 512 /* sector size (bytes) */ |
|
12 #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ |
|
13 #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ |
|
14 #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ |
|
15 #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) |
|
16 #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ |
|
17 #define CF_LE_W(v) le16_to_cpu(v) |
|
18 #define CF_LE_L(v) le32_to_cpu(v) |
|
19 #define CT_LE_W(v) cpu_to_le16(v) |
|
20 #define CT_LE_L(v) cpu_to_le32(v) |
|
21 |
|
22 |
|
23 #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ |
|
24 #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ |
|
25 |
|
26 /* directory limit */ |
|
27 #define FAT_MAX_DIR_ENTRIES (65536) |
|
28 #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) |
|
29 |
|
30 #define ATTR_NONE 0 /* no attribute bits */ |
|
31 #define ATTR_RO 1 /* read-only */ |
|
32 #define ATTR_HIDDEN 2 /* hidden */ |
|
33 #define ATTR_SYS 4 /* system */ |
|
34 #define ATTR_VOLUME 8 /* volume label */ |
|
35 #define ATTR_DIR 16 /* directory */ |
|
36 #define ATTR_ARCH 32 /* archived */ |
|
37 |
|
38 /* attribute bits that are copied "as is" */ |
|
39 #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) |
|
40 /* bits that are used by the Windows 95/Windows NT extended FAT */ |
|
41 #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) |
|
42 |
|
43 #define CASE_LOWER_BASE 8 /* base is lower case */ |
|
44 #define CASE_LOWER_EXT 16 /* extension is lower case */ |
|
45 |
|
46 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ |
|
47 #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) |
|
48 |
|
49 #define MSDOS_NAME 11 /* maximum name length */ |
|
50 #define MSDOS_LONGNAME 256 /* maximum name length */ |
|
51 #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ |
|
52 #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ |
|
53 #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ |
|
54 |
|
55 #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ |
|
56 MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) |
|
57 |
|
58 /* start of data cluster's entry (number of reserved clusters) */ |
|
59 #define FAT_START_ENT 2 |
|
60 |
|
61 /* maximum number of clusters */ |
|
62 #define MAX_FAT12 0xFF4 |
|
63 #define MAX_FAT16 0xFFF4 |
|
64 #define MAX_FAT32 0x0FFFFFF6 |
|
65 #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ |
|
66 MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) |
|
67 |
|
68 /* bad cluster mark */ |
|
69 #define BAD_FAT12 0xFF7 |
|
70 #define BAD_FAT16 0xFFF7 |
|
71 #define BAD_FAT32 0x0FFFFFF7 |
|
72 |
|
73 /* standard EOF */ |
|
74 #define EOF_FAT12 0xFFF |
|
75 #define EOF_FAT16 0xFFFF |
|
76 #define EOF_FAT32 0x0FFFFFFF |
|
77 |
|
78 #define FAT_ENT_FREE (0) |
|
79 #define FAT_ENT_BAD (BAD_FAT32) |
|
80 #define FAT_ENT_EOF (EOF_FAT32) |
|
81 |
|
82 #define FAT_FSINFO_SIG1 0x41615252 |
|
83 #define FAT_FSINFO_SIG2 0x61417272 |
|
84 #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ |
|
85 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) |
|
86 |
|
87 struct __fat_dirent { |
|
88 long d_ino; |
|
89 __kernel_off_t d_off; |
|
90 unsigned short d_reclen; |
|
91 char d_name[256]; /* We must not include limits.h! */ |
|
92 }; |
|
93 |
|
94 /* |
|
95 * ioctl commands |
|
96 */ |
|
97 #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) |
|
98 #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) |
|
99 /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ |
|
100 #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) |
|
101 #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) |
|
102 |
|
103 struct fat_boot_sector { |
|
104 __u8 ignored[3]; /* Boot strap short or near jump */ |
|
105 __u8 system_id[8]; /* Name - can be used to special case |
|
106 partition manager volumes */ |
|
107 __u8 sector_size[2]; /* bytes per logical sector */ |
|
108 __u8 sec_per_clus; /* sectors/cluster */ |
|
109 __le16 reserved; /* reserved sectors */ |
|
110 __u8 fats; /* number of FATs */ |
|
111 __u8 dir_entries[2]; /* root directory entries */ |
|
112 __u8 sectors[2]; /* number of sectors */ |
|
113 __u8 media; /* media code */ |
|
114 __le16 fat_length; /* sectors/FAT */ |
|
115 __le16 secs_track; /* sectors per track */ |
|
116 __le16 heads; /* number of heads */ |
|
117 __le32 hidden; /* hidden sectors (unused) */ |
|
118 __le32 total_sect; /* number of sectors (if sectors == 0) */ |
|
119 |
|
120 /* The following fields are only used by FAT32 */ |
|
121 __le32 fat32_length; /* sectors/FAT */ |
|
122 __le16 flags; /* bit 8: fat mirroring, low 4: active fat */ |
|
123 __u8 version[2]; /* major, minor filesystem version */ |
|
124 __le32 root_cluster; /* first cluster in root directory */ |
|
125 __le16 info_sector; /* filesystem info sector */ |
|
126 __le16 backup_boot; /* backup boot sector */ |
|
127 __le16 reserved2[6]; /* Unused */ |
|
128 }; |
|
129 |
|
130 struct fat_boot_fsinfo { |
|
131 __le32 signature1; /* 0x41615252L */ |
|
132 __le32 reserved1[120]; /* Nothing as far as I can tell */ |
|
133 __le32 signature2; /* 0x61417272L */ |
|
134 __le32 free_clusters; /* Free cluster count. -1 if unknown */ |
|
135 __le32 next_cluster; /* Most recently allocated cluster */ |
|
136 __le32 reserved2[4]; |
|
137 }; |
|
138 |
|
139 struct msdos_dir_entry { |
|
140 __u8 name[MSDOS_NAME];/* name and extension */ |
|
141 __u8 attr; /* attribute bits */ |
|
142 __u8 lcase; /* Case for base and extension */ |
|
143 __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ |
|
144 __le16 ctime; /* Creation time */ |
|
145 __le16 cdate; /* Creation date */ |
|
146 __le16 adate; /* Last access date */ |
|
147 __le16 starthi; /* High 16 bits of cluster in FAT32 */ |
|
148 __le16 time,date,start;/* time, date and first cluster */ |
|
149 __le32 size; /* file size (in bytes) */ |
|
150 }; |
|
151 |
|
152 /* Up to 13 characters of the name */ |
|
153 struct msdos_dir_slot { |
|
154 __u8 id; /* sequence number for slot */ |
|
155 __u8 name0_4[10]; /* first 5 characters in name */ |
|
156 __u8 attr; /* attribute byte */ |
|
157 __u8 reserved; /* always 0 */ |
|
158 __u8 alias_checksum; /* checksum for 8.3 alias */ |
|
159 __u8 name5_10[12]; /* 6 more characters in name */ |
|
160 __le16 start; /* starting cluster number, 0 in long slots */ |
|
161 __u8 name11_12[4]; /* last 2 characters in name */ |
|
162 }; |
|
163 |
|
164 #ifdef __KERNEL__ |
|
165 /* media of boot sector */ |
|
166 static inline int fat_valid_media(u8 media) |
|
167 { |
|
168 return 0xf8 <= media || media == 0xf0; |
|
169 } |
|
170 #endif /* !__KERNEL__ */ |
|
171 #endif /* !_LINUX_MSDOS_FS_H */ |