1 #ifndef _UAPI_LINUX_MSDOS_FS_H 2 #define _UAPI_LINUX_MSDOS_FS_H 3 4 #include <linux/types.h> 5 #include <linux/magic.h> 6 #include <asm/byteorder.h> 7 8 /* 9 * The MS-DOS filesystem constants/structures 10 */ 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 MSDOS_LONGNAME 256 /* maximum name length */ 19 #define CF_LE_W(v) le16_to_cpu(v) 20 #define CF_LE_L(v) le32_to_cpu(v) 21 #define CT_LE_W(v) cpu_to_le16(v) 22 #define CT_LE_L(v) cpu_to_le32(v) 23 24 #define MSDOS_ROOT_INO 1 /* The root inode number */ 25 #define MSDOS_FSINFO_INO 2 /* Used for managing the FSINFO block */ 26 27 #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ 28 29 /* directory limit */ 30 #define FAT_MAX_DIR_ENTRIES (65536) 31 #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) 32 33 #define ATTR_NONE 0 /* no attribute bits */ 34 #define ATTR_RO 1 /* read-only */ 35 #define ATTR_HIDDEN 2 /* hidden */ 36 #define ATTR_SYS 4 /* system */ 37 #define ATTR_VOLUME 8 /* volume label */ 38 #define ATTR_DIR 16 /* directory */ 39 #define ATTR_ARCH 32 /* archived */ 40 41 /* attribute bits that are copied "as is" */ 42 #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) 43 /* bits that are used by the Windows 95/Windows NT extended FAT */ 44 #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 45 46 #define CASE_LOWER_BASE 8 /* base is lower case */ 47 #define CASE_LOWER_EXT 16 /* extension is lower case */ 48 49 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ 50 #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) 51 52 #define FAT_LFN_LEN 255 /* maximum long name length */ 53 #define MSDOS_NAME 11 /* maximum name length */ 54 #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ 55 #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ 56 #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ 57 58 #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ 59 MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) 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 #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ 69 MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) 70 71 /* bad cluster mark */ 72 #define BAD_FAT12 0xFF7 73 #define BAD_FAT16 0xFFF7 74 #define BAD_FAT32 0x0FFFFFF7 75 76 /* standard EOF */ 77 #define EOF_FAT12 0xFFF 78 #define EOF_FAT16 0xFFFF 79 #define EOF_FAT32 0x0FFFFFFF 80 81 #define FAT_ENT_FREE (0) 82 #define FAT_ENT_BAD (BAD_FAT32) 83 #define FAT_ENT_EOF (EOF_FAT32) 84 85 #define FAT_FSINFO_SIG1 0x41615252 86 #define FAT_FSINFO_SIG2 0x61417272 87 #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ 88 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) 89 90 #define FAT_STATE_DIRTY 0x01 91 92 struct __fat_dirent { 93 long d_ino; 94 __kernel_off_t d_off; 95 unsigned short d_reclen; 96 char d_name[256]; /* We must not include limits.h! */ 97 }; 98 99 /* 100 * ioctl commands 101 */ 102 #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) 103 #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) 104 /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ 105 #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) 106 #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) 107 /*Android kernel has used 0x12, so we use 0x13*/ 108 #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32) 109 110 struct fat_boot_sector { 111 __u8 ignored[3]; /* Boot strap short or near jump */ 112 __u8 system_id[8]; /* Name - can be used to special case 113 partition manager volumes */ 114 __u8 sector_size[2]; /* bytes per logical sector */ 115 __u8 sec_per_clus; /* sectors/cluster */ 116 __le16 reserved; /* reserved sectors */ 117 __u8 fats; /* number of FATs */ 118 __u8 dir_entries[2]; /* root directory entries */ 119 __u8 sectors[2]; /* number of sectors */ 120 __u8 media; /* media code */ 121 __le16 fat_length; /* sectors/FAT */ 122 __le16 secs_track; /* sectors per track */ 123 __le16 heads; /* number of heads */ 124 __le32 hidden; /* hidden sectors (unused) */ 125 __le32 total_sect; /* number of sectors (if sectors == 0) */ 126 127 union { 128 struct { 129 /* Extended BPB Fields for FAT16 */ 130 __u8 drive_number; /* Physical drive number */ 131 __u8 state; /* undocumented, but used 132 for mount state. */ 133 __u8 signature; /* extended boot signature */ 134 __u8 vol_id[4]; /* volume ID */ 135 __u8 vol_label[11]; /* volume label */ 136 __u8 fs_type[8]; /* file system type */ 137 /* other fields are not added here */ 138 } fat16; 139 140 struct { 141 /* only used by FAT32 */ 142 __le32 length; /* sectors/FAT */ 143 __le16 flags; /* bit 8: fat mirroring, 144 low 4: active fat */ 145 __u8 version[2]; /* major, minor filesystem 146 version */ 147 __le32 root_cluster; /* first cluster in 148 root directory */ 149 __le16 info_sector; /* filesystem info sector */ 150 __le16 backup_boot; /* backup boot sector */ 151 __le16 reserved2[6]; /* Unused */ 152 /* Extended BPB Fields for FAT32 */ 153 __u8 drive_number; /* Physical drive number */ 154 __u8 state; /* undocumented, but used 155 for mount state. */ 156 __u8 signature; /* extended boot signature */ 157 __u8 vol_id[4]; /* volume ID */ 158 __u8 vol_label[11]; /* volume label */ 159 __u8 fs_type[8]; /* file system type */ 160 /* other fields are not added here */ 161 } fat32; 162 }; 163 }; 164 165 struct fat_boot_fsinfo { 166 __le32 signature1; /* 0x41615252L */ 167 __le32 reserved1[120]; /* Nothing as far as I can tell */ 168 __le32 signature2; /* 0x61417272L */ 169 __le32 free_clusters; /* Free cluster count. -1 if unknown */ 170 __le32 next_cluster; /* Most recently allocated cluster */ 171 __le32 reserved2[4]; 172 }; 173 174 struct msdos_dir_entry { 175 __u8 name[MSDOS_NAME];/* name and extension */ 176 __u8 attr; /* attribute bits */ 177 __u8 lcase; /* Case for base and extension */ 178 __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ 179 __le16 ctime; /* Creation time */ 180 __le16 cdate; /* Creation date */ 181 __le16 adate; /* Last access date */ 182 __le16 starthi; /* High 16 bits of cluster in FAT32 */ 183 __le16 time,date,start;/* time, date and first cluster */ 184 __le32 size; /* file size (in bytes) */ 185 }; 186 187 /* Up to 13 characters of the name */ 188 struct msdos_dir_slot { 189 __u8 id; /* sequence number for slot */ 190 __u8 name0_4[10]; /* first 5 characters in name */ 191 __u8 attr; /* attribute byte */ 192 __u8 reserved; /* always 0 */ 193 __u8 alias_checksum; /* checksum for 8.3 alias */ 194 __u8 name5_10[12]; /* 6 more characters in name */ 195 __le16 start; /* starting cluster number, 0 in long slots */ 196 __u8 name11_12[4]; /* last 2 characters in name */ 197 }; 198 199 #endif /* _UAPI_LINUX_MSDOS_FS_H */ 200