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#ifndef _LINUX_MSDOS_FS_H
#define _LINUX_MSDOS_FS_H
/*
* The MS-DOS filesystem constants/structures
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/fd.h>
#include <asm/types.h>
#define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */
#define SECTOR_SIZE 512 /* sector size (bytes) */
#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
#define MSDOS_DPS (SECTOR_SIZE/sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
#define FAT_CACHE 8 /* FAT cache size */
#define MSDOS_MAX_EXTRA 3 /* tolerate up to that number of clusters which are
inaccessible because the FAT is too short */
#define ATTR_RO 1 /* read-only */
#define ATTR_HIDDEN 2 /* hidden */
#define ATTR_SYS 4 /* system */
#define ATTR_VOLUME 8 /* volume label */
#define ATTR_DIR 16 /* directory */
#define ATTR_ARCH 32 /* archived */
#define ATTR_NONE 0 /* no attribute bits */
#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
/* attribute bits that are copied "as is" */
#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
/* bits that are used by the Windows 95/Windows NT extended FAT */
#define ATTR_DIR_READ_BOTH 512 /* read both short and long names from the
* vfat filesystem. This is used by Samba
* to export the vfat filesystem with correct
* shortnames. */
#define ATTR_DIR_READ_SHORT 1024
#define CASE_LOWER_BASE 8 /* base is lower case */
#define CASE_LOWER_EXT 16 /* extension is lower case */
#define SCAN_ANY 0 /* either hidden or not */
#define SCAN_HID 1 /* only hidden */
#define SCAN_NOTHID 2 /* only not hidden */
#define SCAN_NOTANY 3 /* test name, then use SCAN_HID or SCAN_NOTHID */
#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
#define IS_FREE(n) (!*(n) || *(const unsigned char *) (n) == DELETED_FLAG)
#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
/* valid file mode bits */
#define MSDOS_SB(s) (&((s)->u.msdos_sb))
#define MSDOS_I(i) (&((i)->u.msdos_i))
#define MSDOS_NAME 11 /* maximum name length */
#define MSDOS_LONGNAME 256 /* maximum name length */
#define MSDOS_SLOTS 21 /* max # of slots needed for short and long names */
#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
#define MSDOS_FAT12 4084 /* maximum number of clusters in a 12 bit FAT */
#define EOF_FAT12 0xFF8 /* standard EOF */
#define EOF_FAT16 0xFFF8
#define EOF_FAT32 0xFFFFFF8
#define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12)
#define FAT_FSINFO_SIG1 0x41615252
#define FAT_FSINFO_SIG2 0x61417272
#define IS_FSINFO(x) (CF_LE_L((x)->signature1) == FAT_FSINFO_SIG1 \
&& CF_LE_L((x)->signature2) == FAT_FSINFO_SIG2)
/*
* Inode flags
*/
#define FAT_BINARY_FL 0x00000001 /* File contains binary data */
/*
* ioctl commands
*/
#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2])
/*
* vfat shortname flags
*/
#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
/*
* Conversion from and to little-endian byte order. (no-op on i386/i486)
*
* Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
* BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
*/
#define CF_LE_W(v) le16_to_cpu(v)
#define CF_LE_L(v) le32_to_cpu(v)
#define CT_LE_W(v) cpu_to_le16(v)
#define CT_LE_L(v) cpu_to_le32(v)
struct fat_boot_sector {
__s8 ignored[3]; /* Boot strap short or near jump */
__s8 system_id[8]; /* Name - can be used to special case
partition manager volumes */
__u8 sector_size[2]; /* bytes per logical sector */
__u8 cluster_size; /* sectors/cluster */
__u16 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 (unused) */
__u16 fat_length; /* sectors/FAT */
__u16 secs_track; /* sectors per track */
__u16 heads; /* number of heads */
__u32 hidden; /* hidden sectors (unused) */
__u32 total_sect; /* number of sectors (if sectors == 0) */
/* The following fields are only used by FAT32 */
__u32 fat32_length; /* sectors/FAT */
__u16 flags; /* bit 8: fat mirroring, low 4: active fat */
__u8 version[2]; /* major, minor filesystem version */
__u32 root_cluster; /* first cluster in root directory */
__u16 info_sector; /* filesystem info sector */
__u16 backup_boot; /* backup boot sector */
__u16 reserved2[6]; /* Unused */
};
struct fat_boot_fsinfo {
__u32 signature1; /* 0x41615252L */
__u32 reserved1[120]; /* Nothing as far as I can tell */
__u32 signature2; /* 0x61417272L */
__u32 free_clusters; /* Free cluster count. -1 if unknown */
__u32 next_cluster; /* Most recently allocated cluster.
* Unused under Linux. */
__u32 reserved2[4];
};
struct msdos_dir_entry {
__s8 name[8],ext[3]; /* name and extension */
__u8 attr; /* attribute bits */
__u8 lcase; /* Case for base and extension */
__u8 ctime_ms; /* Creation time, milliseconds */
__u16 ctime; /* Creation time */
__u16 cdate; /* Creation date */
__u16 adate; /* Last access date */
__u16 starthi; /* High 16 bits of cluster in FAT32 */
__u16 time,date,start;/* time, date and first cluster */
__u32 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 */
__u16 start; /* starting cluster number, 0 in long slots */
__u8 name11_12[4]; /* last 2 characters in name */
};
struct vfat_slot_info {
int is_long; /* was the found entry long */
int long_slots; /* number of long slots in filename */
int total_slots; /* total slots (long and short) */
loff_t longname_offset; /* dir offset for longname start */
loff_t shortname_offset; /* dir offset for shortname start */
int ino; /* ino for the file */
};
/* Determine whether this FS has kB-aligned data. */
#define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
((mib)->data_start & 1)))
/* Convert attribute bits and a mask to the UNIX mode. */
#define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
/* Convert the UNIX mode to MS-DOS attribute bits. */
#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
#endif
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