/* fsck.fat.h - Common data structures and global variables
Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
The complete text of the GNU General Public License
can be found in /usr/share/common-licenses/GPL-3 file.
*/
/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
* by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
#ifndef _DOSFSCK_H
#define _DOSFSCK_H
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <endian.h>
#include "msdos_fs.h"
#define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
#define FAT_STATE_DIRTY 0x01
/* ++roman: Use own definition of boot sector structure -- the kernel headers'
* name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
struct boot_sector {
uint8_t ignored[3]; /* Boot strap short or near jump */
uint8_t system_id[8]; /* Name - can be used to special case
partition manager volumes */
uint8_t sector_size[2]; /* bytes per logical sector */
uint8_t cluster_size; /* sectors/cluster */
uint16_t reserved; /* reserved sectors */
uint8_t fats; /* number of FATs */
uint8_t dir_entries[2]; /* root directory entries */
uint8_t sectors[2]; /* number of sectors */
uint8_t media; /* media code (unused) */
uint16_t fat_length; /* sectors/FAT */
uint16_t secs_track; /* sectors per track */
uint16_t heads; /* number of heads */
uint32_t hidden; /* hidden sectors (unused) */
uint32_t total_sect; /* number of sectors (if sectors == 0) */
/* The following fields are only used by FAT32 */
uint32_t fat32_length; /* sectors/FAT */
uint16_t flags; /* bit 8: fat mirroring, low 4: active fat */
uint8_t version[2]; /* major, minor filesystem version */
uint32_t root_cluster; /* first cluster in root directory */
uint16_t info_sector; /* filesystem info sector */
uint16_t backup_boot; /* backup boot sector */
uint8_t reserved2[12]; /* Unused */
uint8_t drive_number; /* Logical Drive Number */
uint8_t reserved3; /* Unused */
uint8_t extended_sig; /* Extended Signature (0x29) */
uint32_t serial; /* Serial number */
uint8_t label[11]; /* FS label */
uint8_t fs_type[8]; /* FS Type */
/* fill up to 512 bytes */
uint8_t junk[422];
} __attribute__ ((packed));
struct boot_sector_16 {
uint8_t ignored[3]; /* Boot strap short or near jump */
uint8_t system_id[8]; /* Name - can be used to special case
partition manager volumes */
uint8_t sector_size[2]; /* bytes per logical sector */
uint8_t cluster_size; /* sectors/cluster */
uint16_t reserved; /* reserved sectors */
uint8_t fats; /* number of FATs */
uint8_t dir_entries[2]; /* root directory entries */
uint8_t sectors[2]; /* number of sectors */
uint8_t media; /* media code (unused) */
uint16_t fat_length; /* sectors/FAT */
uint16_t secs_track; /* sectors per track */
uint16_t heads; /* number of heads */
uint32_t hidden; /* hidden sectors (unused) */
uint32_t total_sect; /* number of sectors (if sectors == 0) */
uint8_t drive_number; /* Logical Drive Number */
uint8_t reserved2; /* Unused */
uint8_t extended_sig; /* Extended Signature (0x29) */
uint32_t serial; /* Serial number */
uint8_t label[11]; /* FS label */
uint8_t fs_type[8]; /* FS Type */
/* fill up to 512 bytes */
uint8_t junk[450];
} __attribute__ ((packed));
struct info_sector {
uint32_t magic; /* Magic for info sector ('RRaA') */
uint8_t junk[0x1dc];
uint32_t reserved1; /* Nothing as far as I can tell */
uint32_t signature; /* 0x61417272 ('rrAa') */
uint32_t free_clusters; /* Free cluster count. -1 if unknown */
uint32_t next_cluster; /* Most recently allocated cluster. */
uint32_t reserved2[3];
uint16_t reserved3;
uint16_t boot_sign;
};
typedef struct {
uint8_t name[8], ext[3]; /* name and extension */
uint8_t attr; /* attribute bits */
uint8_t lcase; /* Case for base and extension */
uint8_t ctime_ms; /* Creation time, milliseconds */
uint16_t ctime; /* Creation time */
uint16_t cdate; /* Creation date */
uint16_t adate; /* Last access date */
uint16_t starthi; /* High 16 bits of cluster in FAT32 */
uint16_t time, date, start; /* time, date and first cluster */
uint32_t size; /* file size (in bytes) */
} __attribute__ ((packed)) DIR_ENT;
typedef struct _dos_file {
DIR_ENT dir_ent;
char *lfn;
loff_t offset;
loff_t lfn_offset;
struct _dos_file *parent; /* parent directory */
struct _dos_file *next; /* next entry */
struct _dos_file *first; /* first entry (directory only) */
} DOS_FILE;
typedef struct {
uint32_t value;
uint32_t reserved;
} FAT_ENTRY;
typedef struct {
int nfats;
loff_t fat_start;
unsigned int fat_size; /* unit is bytes */
unsigned int fat_bits; /* size of a FAT entry */
unsigned int eff_fat_bits; /* # of used bits in a FAT entry */
uint32_t root_cluster; /* 0 for old-style root dir */
loff_t root_start;
unsigned int root_entries;
loff_t data_start;
unsigned int cluster_size;
uint32_t clusters;
loff_t fsinfo_start; /* 0 if not present */
long free_clusters;
loff_t backupboot_start; /* 0 if not present */
unsigned char *fat;
DOS_FILE **cluster_owner;
char *label;
} DOS_FS;
extern int interactive, rw, list, verbose, test, write_immed;
extern int atari_format;
extern unsigned n_files;
extern void *mem_queue;
/* value to use as end-of-file marker */
#define FAT_EOF(fs) ((atari_format ? 0xfff : 0xff8) | FAT_EXTD(fs))
#define FAT_IS_EOF(fs,v) ((uint32_t)(v) >= (0xff8|FAT_EXTD(fs)))
/* value to mark bad clusters */
#define FAT_BAD(fs) (0xff7 | FAT_EXTD(fs))
/* range of values used for bad clusters */
#define FAT_MIN_BAD(fs) ((atari_format ? 0xff0 : 0xff7) | FAT_EXTD(fs))
#define FAT_MAX_BAD(fs) ((atari_format ? 0xff7 : 0xff7) | FAT_EXTD(fs))
#define FAT_IS_BAD(fs,v) ((v) >= FAT_MIN_BAD(fs) && (v) <= FAT_MAX_BAD(fs))
/* return -16 as a number with fs->fat_bits bits */
#define FAT_EXTD(fs) (((1 << fs->eff_fat_bits)-1) & ~0xf)
/* marker for files with no 8.3 name */
#define FAT_NO_83NAME 32
#endif
