/* attribute bits that are copied "as is" */ #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) /* bits that are used by the Windows 95/Windows NT extended FAT */ #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
#define CASE_LOWER_BASE 8 /* base is lower case */ #define CASE_LOWER_EXT 16 /* extension is lower case */
#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
#define FAT_LFN_LEN 255 /* maximum long name length */ #define MSDOS_NAME 11 /* maximum name length */ #define MSDOS_SLOTS 21 /* max # of slots for short and long names */ #define MSDOS_DOT ". "/* ".", padded to MSDOS_NAME chars */ #define MSDOS_DOTDOT ".. "/* "..", padded to MSDOS_NAME chars */
/* start of data cluster's entry (number of reserved clusters) */ #define FAT_START_ENT 2
/* maximum number of clusters */ #define MAX_FAT12 0xFF4 #define MAX_FAT16 0xFFF4 #define MAX_FAT32 0x0FFFFFF6
/* bad cluster mark */ #define BAD_FAT12 0xFF7 #define BAD_FAT16 0xFFF7 #define BAD_FAT32 0x0FFFFFF7
struct __fat_dirent { long d_ino;
__kernel_off_t d_off; unsignedshort d_reclen; char d_name[256]; /* We must not include limits.h! */
};
/* * ioctl commands
*/ #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct __fat_dirent[2]) #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct __fat_dirent[2]) /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */ #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32) #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) /*Android kernel has used 0x12, so we use 0x13*/ #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32)
struct fat_boot_sector {
__u8 ignored[3]; /* Boot strap short or near jump */
__u8 system_id[8]; /* Name - can be used to special case
partition manager volumes */
__u8 sector_size[2]; /* bytes per logical sector */
__u8 sec_per_clus; /* sectors/cluster */
__le16 reserved; /* reserved sectors */
__u8 fats; /* number of FATs */
__u8 dir_entries[2]; /* root directory entries */
__u8 sectors[2]; /* number of sectors */
__u8 media; /* media code */
__le16 fat_length; /* sectors/FAT */
__le16 secs_track; /* sectors per track */
__le16 heads; /* number of heads */
__le32 hidden; /* hidden sectors (unused) */
__le32 total_sect; /* number of sectors (if sectors == 0) */
union { struct { /* Extended BPB Fields for FAT16 */
__u8 drive_number; /* Physical drive number */
__u8 state; /* undocumented, but used
for mount state. */
__u8 signature; /* extended boot signature */
__u8 vol_id[4]; /* volume ID */
__u8 vol_label[MSDOS_NAME]; /* volume label */
__u8 fs_type[8]; /* file system type */ /* other fields are not added here */
} fat16;
struct { /* only used by FAT32 */
__le32 length; /* sectors/FAT */
__le16 flags; /* bit 8: fat mirroring,
low 4: active fat */
__u8 version[2]; /* major, minor filesystem
version */
__le32 root_cluster; /* first cluster in
root directory */
__le16 info_sector; /* filesystem info sector */
__le16 backup_boot; /* backup boot sector */
__le16 reserved2[6]; /* Unused */ /* Extended BPB Fields for FAT32 */
__u8 drive_number; /* Physical drive number */
__u8 state; /* undocumented, but used
for mount state. */
__u8 signature; /* extended boot signature */
__u8 vol_id[4]; /* volume ID */
__u8 vol_label[MSDOS_NAME]; /* volume label */
__u8 fs_type[8]; /* file system type */ /* other fields are not added here */
} fat32;
};
};
struct fat_boot_fsinfo {
__le32 signature1; /* 0x41615252L */
__le32 reserved1[120]; /* Nothing as far as I can tell */
__le32 signature2; /* 0x61417272L */
__le32 free_clusters; /* Free cluster count. -1 if unknown */
__le32 next_cluster; /* Most recently allocated cluster */
__le32 reserved2[4];
};
struct msdos_dir_entry {
__u8 name[MSDOS_NAME];/* name and extension */
__u8 attr; /* attribute bits */
__u8 lcase; /* Case for base and extension */
__u8 ctime_cs; /* Creation time, centiseconds (0-199) */
__le16 ctime; /* Creation time */
__le16 cdate; /* Creation date */
__le16 adate; /* Last access date */
__le16 starthi; /* High 16 bits of cluster in FAT32 */
__le16 time,date,start;/* time, date and first cluster */
__le32 size; /* file size (in bytes) */
};
/* Up to 13 characters of the name */ struct msdos_dir_slot {
__u8 id; /* sequence number for slot */
__u8 name0_4[10]; /* first 5 characters in name */
__u8 attr; /* attribute byte */
__u8 reserved; /* always 0 */
__u8 alias_checksum; /* checksum for 8.3 alias */
__u8 name5_10[12]; /* 6 more characters in name */
__le16 start; /* starting cluster number, 0 in long slots */
__u8 name11_12[4]; /* last 2 characters in name */
};
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