"Fossies" - the Fresh Open Source Software Archive

Member "dosfstools-4.2/src/fsck.fat.h" (31 Jan 2021, 7468 Bytes) of package /linux/misc/dosfstools-4.2.tar.gz:


As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) C and C++ source code syntax highlighting (style: standard) with prefixed line numbers and code folding option. Alternatively you can here view or download the uninterpreted source code file. See also the latest Fossies "Diffs" side-by-side code changes report for "fsck.fat.h": 4.1_vs_4.2.

    1 /* fsck.fat.h  -  Common data structures and global variables
    2 
    3    Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
    4    Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
    5    Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
    6    Copyright (C) 2015 Andreas Bombe <aeb@debian.org>
    7 
    8    This program is free software: you can redistribute it and/or modify
    9    it under the terms of the GNU General Public License as published by
   10    the Free Software Foundation, either version 3 of the License, or
   11    (at your option) any later version.
   12 
   13    This program is distributed in the hope that it will be useful,
   14    but WITHOUT ANY WARRANTY; without even the implied warranty of
   15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   16    GNU General Public License for more details.
   17 
   18    You should have received a copy of the GNU General Public License
   19    along with this program. If not, see <http://www.gnu.org/licenses/>.
   20 
   21    The complete text of the GNU General Public License
   22    can be found in /usr/share/common-licenses/GPL-3 file.
   23 */
   24 
   25 /* FAT32, VFAT, Atari format support, and various fixes additions May 1998
   26  * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
   27 
   28 #ifndef _DOSFSCK_H
   29 #define _DOSFSCK_H
   30 
   31 #include <sys/types.h>
   32 #include <fcntl.h>
   33 #include <stddef.h>
   34 #include <stdint.h>
   35 #include "endian_compat.h"
   36 
   37 #include "msdos_fs.h"
   38 
   39 #define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
   40 
   41 #define FAT_STATE_DIRTY 0x01
   42 #define FAT_NEED_SURFACE_TEST 0x02
   43 
   44 #define FAT16_FLAG_HARDDISK_ERROR 0x4000
   45 #define FAT16_FLAG_CLEAN_SHUTDOWN 0x8000
   46 
   47 #define FAT32_FLAG_HARDDISK_ERROR 0x4000000
   48 #define FAT32_FLAG_CLEAN_SHUTDOWN 0x8000000
   49 
   50 /* ++roman: Use own definition of boot sector structure -- the kernel headers'
   51  * name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
   52 struct boot_sector {
   53     uint8_t ignored[3];     /* Boot strap short or near jump */
   54     uint8_t system_id[8];   /* Name - can be used to special case
   55                    partition manager volumes */
   56     uint8_t sector_size[2]; /* bytes per logical sector */
   57     uint8_t cluster_size;   /* sectors/cluster */
   58     uint16_t reserved;      /* reserved sectors */
   59     uint8_t fats;       /* number of FATs */
   60     uint8_t dir_entries[2]; /* root directory entries */
   61     uint8_t sectors[2];     /* number of sectors */
   62     uint8_t media;      /* media code (unused) */
   63     uint16_t fat_length;    /* sectors/FAT */
   64     uint16_t secs_track;    /* sectors per track */
   65     uint16_t heads;     /* number of heads */
   66     uint32_t hidden;        /* hidden sectors (unused) */
   67     uint32_t total_sect;    /* number of sectors (if sectors == 0) */
   68 
   69     /* The following fields are only used by FAT32 */
   70     uint32_t fat32_length;  /* sectors/FAT */
   71     uint16_t flags;     /* bit 8: fat mirroring, low 4: active fat */
   72     uint8_t version[2];     /* major, minor filesystem version */
   73     uint32_t root_cluster;  /* first cluster in root directory */
   74     uint16_t info_sector;   /* filesystem info sector */
   75     uint16_t backup_boot;   /* backup boot sector */
   76     uint8_t reserved2[12];  /* Unused */
   77 
   78     uint8_t drive_number;   /* Logical Drive Number */
   79     uint8_t boot_flags;     /* bit 0: dirty, bit 1: need surface test */
   80 
   81     uint8_t extended_sig;   /* Extended Signature (0x29) */
   82     uint32_t serial;        /* Serial number */
   83     uint8_t label[11];      /* FS label */
   84     uint8_t fs_type[8];     /* FS Type */
   85 
   86     /* fill up to 512 bytes */
   87     uint8_t junk[422];
   88 } __attribute__ ((packed));
   89 
   90 struct boot_sector_16 {
   91     uint8_t ignored[3];     /* Boot strap short or near jump */
   92     uint8_t system_id[8];   /* Name - can be used to special case
   93                    partition manager volumes */
   94     uint8_t sector_size[2]; /* bytes per logical sector */
   95     uint8_t cluster_size;   /* sectors/cluster */
   96     uint16_t reserved;      /* reserved sectors */
   97     uint8_t fats;       /* number of FATs */
   98     uint8_t dir_entries[2]; /* root directory entries */
   99     uint8_t sectors[2];     /* number of sectors */
  100     uint8_t media;      /* media code (unused) */
  101     uint16_t fat_length;    /* sectors/FAT */
  102     uint16_t secs_track;    /* sectors per track */
  103     uint16_t heads;     /* number of heads */
  104     uint32_t hidden;        /* hidden sectors (unused) */
  105     uint32_t total_sect;    /* number of sectors (if sectors == 0) */
  106 
  107     uint8_t drive_number;   /* Logical Drive Number */
  108     uint8_t boot_flags;     /* bit 0: dirty, bit 1: need surface test */
  109 
  110     uint8_t extended_sig;   /* Extended Signature (0x29) */
  111     uint32_t serial;        /* Serial number */
  112     uint8_t label[11];      /* FS label */
  113     uint8_t fs_type[8];     /* FS Type */
  114 
  115     /* fill up to 512 bytes */
  116     uint8_t junk[450];
  117 } __attribute__ ((packed));
  118 
  119 struct info_sector {
  120     uint32_t magic;     /* Magic for info sector ('RRaA') */
  121     uint8_t reserved1[480];
  122     uint32_t signature;     /* 0x61417272 ('rrAa') */
  123     uint32_t free_clusters; /* Free cluster count.  -1 if unknown */
  124     uint32_t next_cluster;  /* Most recently allocated cluster. */
  125     uint8_t reserved2[12];
  126     uint32_t boot_sign;
  127 };
  128 
  129 typedef struct {
  130     uint8_t name[MSDOS_NAME];   /* name including extension */
  131     uint8_t attr;       /* attribute bits */
  132     uint8_t lcase;      /* Case for base and extension */
  133     uint8_t ctime_ms;       /* Creation time, milliseconds */
  134     uint16_t ctime;     /* Creation time */
  135     uint16_t cdate;     /* Creation date */
  136     uint16_t adate;     /* Last access date */
  137     uint16_t starthi;       /* High 16 bits of cluster in FAT32 */
  138     uint16_t time, date, start; /* time, date and first cluster */
  139     uint32_t size;      /* file size (in bytes) */
  140 } __attribute__ ((packed)) DIR_ENT;
  141 
  142 typedef struct _dos_file {
  143     DIR_ENT dir_ent;
  144     char *lfn;
  145     off_t offset;
  146     off_t lfn_offset;
  147     struct _dos_file *parent;   /* parent directory */
  148     struct _dos_file *next; /* next entry */
  149     struct _dos_file *first;    /* first entry (directory only) */
  150 } DOS_FILE;
  151 
  152 typedef struct {
  153     uint32_t value;
  154     uint32_t reserved;
  155 } FAT_ENTRY;
  156 
  157 typedef struct {
  158     int nfats;
  159     off_t fat_start;
  160     unsigned int fat_size;  /* unit is bytes */
  161     unsigned int fat_bits;  /* size of a FAT entry */
  162     unsigned int eff_fat_bits;  /* # of used bits in a FAT entry */
  163     uint32_t root_cluster;  /* 0 for old-style root dir */
  164     off_t root_start;
  165     unsigned int root_entries;
  166     off_t data_start;
  167     unsigned int cluster_size;
  168     uint32_t data_clusters; /* not including two reserved cluster numbers */
  169     off_t fsinfo_start;     /* 0 if not present */
  170     long free_clusters;
  171     off_t backupboot_start; /* 0 if not present */
  172     unsigned char *fat;
  173     DOS_FILE **cluster_owner;
  174     uint32_t serial;
  175     char label[11];
  176 } DOS_FS;
  177 
  178 extern int rw, list, verbose, test, no_spaces_in_sfns;
  179 extern long fat_table;
  180 extern int only_uppercase_label;
  181 extern unsigned n_files;
  182 extern void *mem_queue;
  183 
  184 /* value to use as end-of-file marker */
  185 #define FAT_EOF(fs) ((atari_format ? 0xfff : 0xff8) | FAT_EXTD(fs))
  186 #define FAT_IS_EOF(fs,v) ((uint32_t)(v) >= (0xff8|FAT_EXTD(fs)))
  187 /* value to mark bad clusters */
  188 #define FAT_BAD(fs) (0xff7 | FAT_EXTD(fs))
  189 /* range of values used for bad clusters */
  190 #define FAT_MIN_BAD(fs) ((atari_format ? 0xff0 : 0xff7) | FAT_EXTD(fs))
  191 #define FAT_MAX_BAD(fs) ((atari_format ? 0xff7 : 0xff7) | FAT_EXTD(fs))
  192 #define FAT_IS_BAD(fs,v) ((v) >= FAT_MIN_BAD(fs) && (v) <= FAT_MAX_BAD(fs))
  193 
  194 /* return -16 as a number with fs->fat_bits bits */
  195 #define FAT_EXTD(fs)    (((1 << fs->eff_fat_bits)-1) & ~0xf)
  196 
  197 /* marker for files with no 8.3 name */
  198 #define FAT_NO_83NAME 32
  199 
  200 #endif