1 #ifndef _LINUX_MSDOS_FS_H 2 #define _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 25 #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ 26 #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ 27 28 /* directory limit */ 29 #define FAT_MAX_DIR_ENTRIES (65536) 30 #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) 31 32 #define ATTR_NONE 0 /* no attribute bits */ 33 #define ATTR_RO 1 /* read-only */ 34 #define ATTR_HIDDEN 2 /* hidden */ 35 #define ATTR_SYS 4 /* system */ 36 #define ATTR_VOLUME 8 /* volume label */ 37 #define ATTR_DIR 16 /* directory */ 38 #define ATTR_ARCH 32 /* archived */ 39 40 /* attribute bits that are copied "as is" */ 41 #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) 42 /* bits that are used by the Windows 95/Windows NT extended FAT */ 43 #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 44 45 #define CASE_LOWER_BASE 8 /* base is lower case */ 46 #define CASE_LOWER_EXT 16 /* extension is lower case */ 47 48 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ 49 #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) 50 51 #define FAT_LFN_LEN 255 /* maximum long name length */ 52 #define MSDOS_NAME 11 /* maximum name length */ 53 #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ 54 #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ 55 #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ 56 57 #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ 58 MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) 59 60 /* start of data cluster's entry (number of reserved clusters) */ 61 #define FAT_START_ENT 2 62 63 /* maximum number of clusters */ 64 #define MAX_FAT12 0xFF4 65 #define MAX_FAT16 0xFFF4 66 #define MAX_FAT32 0x0FFFFFF6 67 #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ 68 MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) 69 70 /* bad cluster mark */ 71 #define BAD_FAT12 0xFF7 72 #define BAD_FAT16 0xFFF7 73 #define BAD_FAT32 0x0FFFFFF7 74 75 /* standard EOF */ 76 #define EOF_FAT12 0xFFF 77 #define EOF_FAT16 0xFFFF 78 #define EOF_FAT32 0x0FFFFFFF 79 80 #define FAT_ENT_FREE (0) 81 #define FAT_ENT_BAD (BAD_FAT32) 82 #define FAT_ENT_EOF (EOF_FAT32) 83 84 #define FAT_FSINFO_SIG1 0x41615252 85 #define FAT_FSINFO_SIG2 0x61417272 86 #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ 87 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) 88 89 struct __fat_dirent { 90 long d_ino; 91 __kernel_off_t d_off; 92 unsigned short d_reclen; 93 char d_name[256]; /* We must not include limits.h! */ 94 }; 95 96 /* 97 * ioctl commands 98 */ 99 #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) 100 #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) 101 /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ 102 #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) 103 #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) 104 105 struct fat_boot_sector { 106 __u8 ignored[3]; /* Boot strap short or near jump */ 107 __u8 system_id[8]; /* Name - can be used to special case 108 partition manager volumes */ 109 __u8 sector_size[2]; /* bytes per logical sector */ 110 __u8 sec_per_clus; /* sectors/cluster */ 111 __le16 reserved; /* reserved sectors */ 112 __u8 fats; /* number of FATs */ 113 __u8 dir_entries[2]; /* root directory entries */ 114 __u8 sectors[2]; /* number of sectors */ 115 __u8 media; /* media code */ 116 __le16 fat_length; /* sectors/FAT */ 117 __le16 secs_track; /* sectors per track */ 118 __le16 heads; /* number of heads */ 119 __le32 hidden; /* hidden sectors (unused) */ 120 __le32 total_sect; /* number of sectors (if sectors == 0) */ 121 122 /* The following fields are only used by FAT32 */ 123 __le32 fat32_length; /* sectors/FAT */ 124 __le16 flags; /* bit 8: fat mirroring, low 4: active fat */ 125 __u8 version[2]; /* major, minor filesystem version */ 126 __le32 root_cluster; /* first cluster in root directory */ 127 __le16 info_sector; /* filesystem info sector */ 128 __le16 backup_boot; /* backup boot sector */ 129 __le16 reserved2[6]; /* Unused */ 130 }; 131 132 struct fat_boot_fsinfo { 133 __le32 signature1; /* 0x41615252L */ 134 __le32 reserved1[120]; /* Nothing as far as I can tell */ 135 __le32 signature2; /* 0x61417272L */ 136 __le32 free_clusters; /* Free cluster count. -1 if unknown */ 137 __le32 next_cluster; /* Most recently allocated cluster */ 138 __le32 reserved2[4]; 139 }; 140 141 struct msdos_dir_entry { 142 __u8 name[MSDOS_NAME];/* name and extension */ 143 __u8 attr; /* attribute bits */ 144 __u8 lcase; /* Case for base and extension */ 145 __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ 146 __le16 ctime; /* Creation time */ 147 __le16 cdate; /* Creation date */ 148 __le16 adate; /* Last access date */ 149 __le16 starthi; /* High 16 bits of cluster in FAT32 */ 150 __le16 time,date,start;/* time, date and first cluster */ 151 __le32 size; /* file size (in bytes) */ 152 }; 153 154 /* Up to 13 characters of the name */ 155 struct msdos_dir_slot { 156 __u8 id; /* sequence number for slot */ 157 __u8 name0_4[10]; /* first 5 characters in name */ 158 __u8 attr; /* attribute byte */ 159 __u8 reserved; /* always 0 */ 160 __u8 alias_checksum; /* checksum for 8.3 alias */ 161 __u8 name5_10[12]; /* 6 more characters in name */ 162 __le16 start; /* starting cluster number, 0 in long slots */ 163 __u8 name11_12[4]; /* last 2 characters in name */ 164 }; 165 166 #endif /* !_LINUX_MSDOS_FS_H */ 167
