LXR busybox/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 */
   5struct 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 */
  21struct 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 superblock data on disk
  35 */
  36struct minix_superblock {
  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
  49struct 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
  57enum {
  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/*
  78Basic test script for regressions in mkfs/fsck.
  79Copies current dir into image (typically bbox build tree).
  80
  81#!/bin/sh
  82tmpdir=/tmp/minixtest-$$
  83tmpimg=/tmp/minix-img-$$
  84
  85mkdir $tmpdir
  86dd if=/dev/zero of=$tmpimg bs=1M count=20 || exit
  87./busybox mkfs.minix $tmpimg || exit
  88mount -o loop $tmpimg $tmpdir || exit
  89cp -a "$PWD" $tmpdir
  90umount $tmpdir || exit
  91./busybox fsck.minix -vfm $tmpimg || exit
  92echo "Continue?"
  93read junk
  94./busybox fsck.minix -vfml $tmpimg || exit
  95rmdir $tmpdir
  96rm $tmpimg
  97
  98*/
  99