LCOV - code coverage report
Current view: top level - lkbce/include/linux - msdos_fs.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 3 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : #ifndef _LINUX_MSDOS_FS_H
       2             : #define _LINUX_MSDOS_FS_H
       3             : 
       4             : #include <linux/types.h>
       5             : #include <linux/magic.h>
       6             : #include <asm/byteorder.h>
       7             : 
       8             : /*
       9             :  * The MS-DOS filesystem constants/structures
      10             :  */
      11             : 
      12             : #define SECTOR_SIZE     512             /* sector size (bytes) */
      13             : #define SECTOR_BITS     9               /* log2(SECTOR_SIZE) */
      14             : #define MSDOS_DPB       (MSDOS_DPS)     /* dir entries per block */
      15             : #define MSDOS_DPB_BITS  4               /* log2(MSDOS_DPB) */
      16             : #define MSDOS_DPS       (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
      17             : #define MSDOS_DPS_BITS  4               /* log2(MSDOS_DPS) */
      18             : #define CF_LE_W(v)      le16_to_cpu(v)
      19             : #define CF_LE_L(v)      le32_to_cpu(v)
      20             : #define CT_LE_W(v)      cpu_to_le16(v)
      21             : #define CT_LE_L(v)      cpu_to_le32(v)
      22             : 
      23             : 
      24             : #define MSDOS_ROOT_INO  1       /* == MINIX_ROOT_INO */
      25             : #define MSDOS_DIR_BITS  5       /* log2(sizeof(struct msdos_dir_entry)) */
      26             : 
      27             : /* directory limit */
      28             : #define FAT_MAX_DIR_ENTRIES     (65536)
      29             : #define FAT_MAX_DIR_SIZE        (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
      30             : 
      31             : #define ATTR_NONE       0       /* no attribute bits */
      32             : #define ATTR_RO         1       /* read-only */
      33             : #define ATTR_HIDDEN     2       /* hidden */
      34             : #define ATTR_SYS        4       /* system */
      35             : #define ATTR_VOLUME     8       /* volume label */
      36             : #define ATTR_DIR        16      /* directory */
      37             : #define ATTR_ARCH       32      /* archived */
      38             : 
      39             : /* attribute bits that are copied "as is" */
      40             : #define ATTR_UNUSED     (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
      41             : /* bits that are used by the Windows 95/Windows NT extended FAT */
      42             : #define ATTR_EXT        (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
      43             : 
      44             : #define CASE_LOWER_BASE 8       /* base is lower case */
      45             : #define CASE_LOWER_EXT  16      /* extension is lower case */
      46             : 
      47             : #define DELETED_FLAG    0xe5    /* marks file as deleted when in name[0] */
      48             : #define IS_FREE(n)      (!*(n) || *(n) == DELETED_FLAG)
      49             : 
      50             : #define MSDOS_NAME      11      /* maximum name length */
      51             : #define MSDOS_LONGNAME  256     /* maximum name length */
      52             : #define MSDOS_SLOTS     21      /* max # of slots for short and long names */
      53             : #define MSDOS_DOT       ".          " /* ".", padded to MSDOS_NAME chars */
      54             : #define MSDOS_DOTDOT    "..         " /* "..", padded to MSDOS_NAME chars */
      55             : 
      56             : #define FAT_FIRST_ENT(s, x)     ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
      57             :         MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))
      58             : 
      59             : /* start of data cluster's entry (number of reserved clusters) */
      60             : #define FAT_START_ENT   2
      61             : 
      62             : /* maximum number of clusters */
      63             : #define MAX_FAT12       0xFF4
      64             : #define MAX_FAT16       0xFFF4
      65             : #define MAX_FAT32       0x0FFFFFF6
      66             : #define MAX_FAT(s)      (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
      67             :         MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)
      68             : 
      69             : /* bad cluster mark */
      70             : #define BAD_FAT12       0xFF7
      71             : #define BAD_FAT16       0xFFF7
      72             : #define BAD_FAT32       0x0FFFFFF7
      73             : 
      74             : /* standard EOF */
      75             : #define EOF_FAT12       0xFFF
      76             : #define EOF_FAT16       0xFFFF
      77             : #define EOF_FAT32       0x0FFFFFFF
      78             : 
      79             : #define FAT_ENT_FREE    (0)
      80             : #define FAT_ENT_BAD     (BAD_FAT32)
      81             : #define FAT_ENT_EOF     (EOF_FAT32)
      82             : 
      83             : #define FAT_FSINFO_SIG1 0x41615252
      84             : #define FAT_FSINFO_SIG2 0x61417272
      85             : #define IS_FSINFO(x)    (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
      86             :                          && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
      87             : 
      88             : struct __fat_dirent {
      89             :         long            d_ino;
      90             :         __kernel_off_t  d_off;
      91             :         unsigned short  d_reclen;
      92             :         char            d_name[256]; /* We must not include limits.h! */
      93             : };
      94             : 
      95             : /*
      96             :  * ioctl commands
      97             :  */
      98             : #define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct __fat_dirent[2])
      99             : #define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct __fat_dirent[2])
     100             : /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
     101             : #define FAT_IOCTL_GET_ATTRIBUTES        _IOR('r', 0x10, __u32)
     102             : #define FAT_IOCTL_SET_ATTRIBUTES        _IOW('r', 0x11, __u32)
     103             : 
     104             : struct fat_boot_sector {
     105             :         __u8    ignored[3];     /* Boot strap short or near jump */
     106             :         __u8    system_id[8];   /* Name - can be used to special case
     107             :                                    partition manager volumes */
     108             :         __u8    sector_size[2]; /* bytes per logical sector */
     109             :         __u8    sec_per_clus;   /* sectors/cluster */
     110             :         __le16  reserved;       /* reserved sectors */
     111             :         __u8    fats;           /* number of FATs */
     112             :         __u8    dir_entries[2]; /* root directory entries */
     113             :         __u8    sectors[2];     /* number of sectors */
     114             :         __u8    media;          /* media code */
     115             :         __le16  fat_length;     /* sectors/FAT */
     116             :         __le16  secs_track;     /* sectors per track */
     117             :         __le16  heads;          /* number of heads */
     118             :         __le32  hidden;         /* hidden sectors (unused) */
     119             :         __le32  total_sect;     /* number of sectors (if sectors == 0) */
     120             : 
     121             :         /* The following fields are only used by FAT32 */
     122             :         __le32  fat32_length;   /* sectors/FAT */
     123             :         __le16  flags;          /* bit 8: fat mirroring, low 4: active fat */
     124             :         __u8    version[2];     /* major, minor filesystem version */
     125             :         __le32  root_cluster;   /* first cluster in root directory */
     126             :         __le16  info_sector;    /* filesystem info sector */
     127             :         __le16  backup_boot;    /* backup boot sector */
     128             :         __le16  reserved2[6];   /* Unused */
     129             : };
     130             : 
     131             : struct fat_boot_fsinfo {
     132             :         __le32   signature1;    /* 0x41615252L */
     133             :         __le32   reserved1[120];        /* Nothing as far as I can tell */
     134             :         __le32   signature2;    /* 0x61417272L */
     135             :         __le32   free_clusters; /* Free cluster count.  -1 if unknown */
     136             :         __le32   next_cluster;  /* Most recently allocated cluster */
     137             :         __le32   reserved2[4];
     138             : };
     139           1 : 
     140             : struct msdos_dir_entry {
     141             :         __u8    name[MSDOS_NAME];/* name and extension */
     142             :         __u8    attr;           /* attribute bits */
     143             :         __u8    lcase;          /* Case for base and extension */
     144             :         __u8    ctime_cs;       /* Creation time, centiseconds (0-199) */
     145             :         __le16  ctime;          /* Creation time */
     146             :         __le16  cdate;          /* Creation date */
     147             :         __le16  adate;          /* Last access date */
     148             :         __le16  starthi;        /* High 16 bits of cluster in FAT32 */
     149             :         __le16  time,date,start;/* time, date and first cluster */
     150             :         __le32  size;           /* file size (in bytes) */
     151             : };
     152           1 : 
     153             : /* Up to 13 characters of the name */
     154             : struct msdos_dir_slot {
     155             :         __u8    id;             /* sequence number for slot */
     156             :         __u8    name0_4[10];    /* first 5 characters in name */
     157             :         __u8    attr;           /* attribute byte */
     158             :         __u8    reserved;       /* always 0 */
     159             :         __u8    alias_checksum; /* checksum for 8.3 alias */
     160             :         __u8    name5_10[12];   /* 6 more characters in name */
     161             :         __le16   start;         /* starting cluster number, 0 in long slots */
     162             :         __u8    name11_12[4];   /* last 2 characters in name */
     163             : };
     164             : 
     165             : #ifdef __KERNEL__
     166             : /* media of boot sector */
     167             : static inline int fat_valid_media(u8 media)
     168             : {
     169             :         return 0xf8 <= media || media == 0xf0;
     170             : }
     171           1 : #endif /* !__KERNEL__ */
     172             : #endif /* !_LINUX_MSDOS_FS_H */

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