util-linux/minix.h

   1 /*
   2  * This is the original minix inode layout on disk.
   3  * Note the 8-bit gid and atime and ctime.
   4  */
   5 struct minix1_inode {
   6         uint16_t i_mode;
   7         uint16_t i_uid;
   8         uint32_t i_size;
   9         uint32_t i_time;
  10         uint8_t  i_gid;
  11         uint8_t  i_nlinks;
  12         uint16_t i_zone[9];
  13 };
  14
  15 /*
  16  * The new minix inode has all the time entries, as well as
  17  * long block numbers and a third indirect block (7+1+1+1
  18  * instead of 7+1+1). Also, some previously 8-bit values are
  19  * now 16-bit. The inode is now 64 bytes instead of 32.
  20  */
  21 struct minix2_inode {
  22         uint16_t i_mode;
  23         uint16_t i_nlinks;
  24         uint16_t i_uid;
  25         uint16_t i_gid;
  26         uint32_t i_size;
  27         uint32_t i_atime;
  28         uint32_t i_mtime;
  29         uint32_t i_ctime;
  30         uint32_t i_zone[10];
  31 };
  32
  33 /*
  34  * minix super-block data on disk
  35  */
  36 struct minix_super_block {
  37         uint16_t s_ninodes;
  38         uint16_t s_nzones;
  39         uint16_t s_imap_blocks;
  40         uint16_t s_zmap_blocks;
  41         uint16_t s_firstdatazone;
  42         uint16_t s_log_zone_size;
  43         uint32_t s_max_size;
  44         uint16_t s_magic;
  45         uint16_t s_state;
  46         uint32_t s_zones;
  47 };
  48
  49 struct minix_dir_entry {
  50         uint16_t inode;
  51         char name[0];
  52 };
  53
  54 /* Believe it or not, but mount.h has this one #defined */
  55 #undef BLOCK_SIZE
  56
  57 enum {
  58         BLOCK_SIZE              = 1024,
  59         BITS_PER_BLOCK          = BLOCK_SIZE << 3,
  60
  61         MINIX_ROOT_INO          = 1,
  62         MINIX_BAD_INO           = 2,
  63
  64         MINIX1_SUPER_MAGIC      = 0x137F,       /* original minix fs */
  65         MINIX1_SUPER_MAGIC2     = 0x138F,       /* minix fs, 30 char names */
  66         MINIX2_SUPER_MAGIC      = 0x2468,       /* minix V2 fs */
  67         MINIX2_SUPER_MAGIC2     = 0x2478,       /* minix V2 fs, 30 char names */
  68         MINIX_VALID_FS          = 0x0001,       /* clean fs */
  69         MINIX_ERROR_FS          = 0x0002,       /* fs has errors */
  70
  71         INODE_SIZE1             = sizeof(struct minix1_inode),
  72         INODE_SIZE2             = sizeof(struct minix2_inode),
  73         MINIX1_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix1_inode),
  74         MINIX2_INODES_PER_BLOCK = BLOCK_SIZE / sizeof(struct minix2_inode),
  75 };
  76
  77 /*
  78 Basic test script for regressions in mkfs/fsck.
  79 Copies current dir into image (typically bbox build tree).
  80
  81 #!/bin/sh
  82 tmpdir=/tmp/minixtest-$$
  83 tmpimg=/tmp/minix-img-$$
  84
  85 mkdir $tmpdir
  86 dd if=/dev/zero of=$tmpimg bs=1M count=20 || exit
  87 ./busybox mkfs.minix $tmpimg || exit
  88 mount -o loop $tmpimg $tmpdir || exit
  89 cp -a "$PWD" $tmpdir
  90 umount $tmpdir || exit
  91 ./busybox fsck.minix -vfm $tmpimg || exit
  92 echo "Continue?"
  93 read junk
  94 ./busybox fsck.minix -vfml $tmpimg || exit
  95 rmdir $tmpdir
  96 rm $tmpimg
  97
  98 */