| 1 | #ifndef _LINUX_MSDOS_FS_H |
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| 2 | #define _LINUX_MSDOS_FS_H |
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| 3 | |
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| 4 | /* |
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| 5 | * The MS-DOS filesystem constants/structures |
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| 6 | */ |
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| 7 | |
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| 8 | #define SECTOR_SIZE 512 /* sector size (bytes) */ |
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| 9 | #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */ |
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| 10 | #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */ |
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| 11 | #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */ |
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| 12 | #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry)) |
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| 13 | #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */ |
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| 14 | #define CF_LE_W(v) le16_to_cpu(v) |
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| 15 | #define CF_LE_L(v) le32_to_cpu(v) |
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| 16 | #define CT_LE_W(v) cpu_to_le16(v) |
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| 17 | #define CT_LE_L(v) cpu_to_le32(v) |
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| 18 | |
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| 19 | |
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| 20 | #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */ |
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| 21 | |
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| 22 | #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ |
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| 23 | #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ |
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| 24 | |
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| 25 | /* directory limit */ |
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| 26 | #define FAT_MAX_DIR_ENTRIES (65536) |
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| 27 | #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) |
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| 28 | |
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| 29 | #define ATTR_NONE 0 /* no attribute bits */ |
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| 30 | #define ATTR_RO 1 /* read-only */ |
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| 31 | #define ATTR_HIDDEN 2 /* hidden */ |
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| 32 | #define ATTR_SYS 4 /* system */ |
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| 33 | #define ATTR_VOLUME 8 /* volume label */ |
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| 34 | #define ATTR_DIR 16 /* directory */ |
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| 35 | #define ATTR_ARCH 32 /* archived */ |
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| 36 | |
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| 37 | /* attribute bits that are copied "as is" */ |
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| 38 | #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) |
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| 39 | /* bits that are used by the Windows 95/Windows NT extended FAT */ |
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| 40 | #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) |
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| 41 | |
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| 42 | #define CASE_LOWER_BASE 8 /* base is lower case */ |
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| 43 | #define CASE_LOWER_EXT 16 /* extension is lower case */ |
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| 44 | |
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| 45 | #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ |
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| 46 | #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) |
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| 47 | |
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| 48 | /* valid file mode bits */ |
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| 49 | #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO) |
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| 50 | /* Convert attribute bits and a mask to the UNIX mode. */ |
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| 51 | #define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO)) |
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| 52 | |
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| 53 | #define MSDOS_NAME 11 /* maximum name length */ |
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| 54 | #define MSDOS_LONGNAME 256 /* maximum name length */ |
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| 55 | #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ |
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| 56 | #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */ |
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| 57 | #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */ |
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| 58 | |
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| 59 | /* media of boot sector */ |
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| 60 | #define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0) |
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| 61 | #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ |
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| 62 | MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) |
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| 63 | |
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| 64 | /* start of data cluster's entry (number of reserved clusters) */ |
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| 65 | #define FAT_START_ENT 2 |
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| 66 | |
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| 67 | /* maximum number of clusters */ |
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| 68 | #define MAX_FAT12 0xFF4 |
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| 69 | #define MAX_FAT16 0xFFF4 |
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| 70 | #define MAX_FAT32 0x0FFFFFF6 |
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| 71 | #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ |
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| 72 | MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) |
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| 73 | |
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| 74 | /* bad cluster mark */ |
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| 75 | #define BAD_FAT12 0xFF7 |
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| 76 | #define BAD_FAT16 0xFFF7 |
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| 77 | #define BAD_FAT32 0x0FFFFFF7 |
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| 78 | |
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| 79 | /* standard EOF */ |
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| 80 | #define EOF_FAT12 0xFFF |
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| 81 | #define EOF_FAT16 0xFFFF |
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| 82 | #define EOF_FAT32 0x0FFFFFFF |
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| 83 | |
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| 84 | #define FAT_ENT_FREE (0) |
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| 85 | #define FAT_ENT_BAD (BAD_FAT32) |
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| 86 | #define FAT_ENT_EOF (EOF_FAT32) |
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| 87 | |
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| 88 | #define FAT_FSINFO_SIG1 0x41615252 |
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| 89 | #define FAT_FSINFO_SIG2 0x61417272 |
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| 90 | #define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \ |
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| 91 | && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2) |
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| 92 | |
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| 93 | /* |
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| 94 | * ioctl commands |
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| 95 | */ |
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| 96 | #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) |
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| 97 | #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2]) |
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| 98 | /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ |
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| 99 | #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) |
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| 100 | #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) |
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| 101 | |
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| 102 | /* |
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| 103 | * vfat shortname flags |
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| 104 | */ |
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| 105 | #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ |
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| 106 | #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ |
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| 107 | #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ |
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| 108 | #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ |
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| 109 | #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ |
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| 110 | |
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| 111 | #include <asm/byteorder.h> |
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| 112 | #include <linux/types.h> |
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| 113 | |
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| 114 | struct fat_boot_sector { |
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| 115 | __u8 ignored[3]; /* Boot strap short or near jump */ |
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| 116 | __u8 system_id[8]; /* Name - can be used to special case |
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| 117 | partition manager volumes */ |
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| 118 | __u8 sector_size[2]; /* bytes per logical sector */ |
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| 119 | __u8 sec_per_clus; /* sectors/cluster */ |
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| 120 | __le16 reserved; /* reserved sectors */ |
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| 121 | __u8 fats; /* number of FATs */ |
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| 122 | __u8 dir_entries[2]; /* root directory entries */ |
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| 123 | __u8 sectors[2]; /* number of sectors */ |
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| 124 | __u8 media; /* media code */ |
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| 125 | __le16 fat_length; /* sectors/FAT */ |
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| 126 | __le16 secs_track; /* sectors per track */ |
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| 127 | __le16 heads; /* number of heads */ |
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| 128 | __le32 hidden; /* hidden sectors (unused) */ |
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| 129 | __le32 total_sect; /* number of sectors (if sectors == 0) */ |
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| 130 | |
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| 131 | /* The following fields are only used by FAT32 */ |
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| 132 | __le32 fat32_length; /* sectors/FAT */ |
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| 133 | __le16 flags; /* bit 8: fat mirroring, low 4: active fat */ |
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| 134 | __u8 version[2]; /* major, minor filesystem version */ |
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| 135 | __le32 root_cluster; /* first cluster in root directory */ |
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| 136 | __le16 info_sector; /* filesystem info sector */ |
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| 137 | __le16 backup_boot; /* backup boot sector */ |
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| 138 | __le16 reserved2[6]; /* Unused */ |
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| 139 | }; |
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| 140 | |
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| 141 | struct fat_boot_fsinfo { |
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| 142 | __le32 signature1; /* 0x41615252L */ |
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| 143 | __le32 reserved1[120]; /* Nothing as far as I can tell */ |
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| 144 | __le32 signature2; /* 0x61417272L */ |
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| 145 | __le32 free_clusters; /* Free cluster count. -1 if unknown */ |
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| 146 | __le32 next_cluster; /* Most recently allocated cluster */ |
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| 147 | __le32 reserved2[4]; |
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| 148 | }; |
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| 149 | |
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| 150 | struct msdos_dir_entry { |
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| 151 | __u8 name[8],ext[3]; /* name and extension */ |
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| 152 | __u8 attr; /* attribute bits */ |
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| 153 | __u8 lcase; /* Case for base and extension */ |
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| 154 | __u8 ctime_cs; /* Creation time, centiseconds (0-199) */ |
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| 155 | __le16 ctime; /* Creation time */ |
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| 156 | __le16 cdate; /* Creation date */ |
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| 157 | __le16 adate; /* Last access date */ |
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| 158 | __le16 starthi; /* High 16 bits of cluster in FAT32 */ |
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| 159 | __le16 time,date,start;/* time, date and first cluster */ |
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| 160 | __le32 size; /* file size (in bytes) */ |
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| 161 | }; |
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| 162 | |
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| 163 | /* Up to 13 characters of the name */ |
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| 164 | struct msdos_dir_slot { |
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| 165 | __u8 id; /* sequence number for slot */ |
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| 166 | __u8 name0_4[10]; /* first 5 characters in name */ |
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| 167 | __u8 attr; /* attribute byte */ |
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| 168 | __u8 reserved; /* always 0 */ |
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| 169 | __u8 alias_checksum; /* checksum for 8.3 alias */ |
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| 170 | __u8 name5_10[12]; /* 6 more characters in name */ |
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| 171 | __le16 start; /* starting cluster number, 0 in long slots */ |
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| 172 | __u8 name11_12[4]; /* last 2 characters in name */ |
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| 173 | }; |
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| 174 | |
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| 175 | struct fat_slot_info { |
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| 176 | loff_t i_pos; /* on-disk position of directory entry */ |
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| 177 | loff_t slot_off; /* offset for slot or de start */ |
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| 178 | int nr_slots; /* number of slots + 1(de) in filename */ |
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| 179 | struct msdos_dir_entry *de; |
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| 180 | struct buffer_head *bh; |
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| 181 | }; |
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| 182 | |
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| 183 | |
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| 184 | |
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| 185 | #endif |
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