include/linux/minix_fs.h

   1 #ifndef _LINUX_MINIX_FS_H
   2 #define _LINUX_MINIX_FS_H
   3
   4 /*
   5  * The minix filesystem constants/structures
   6  */
   7
   8 /*
   9  * Thanks to Kees J Bot for sending me the definitions of the new
  10  * minix filesystem (aka V2) with bigger inodes and 32-bit block
  11  * pointers.
  12  */
  13
  14 #define MINIX_ROOT_INO 1
  15
  16 /* Not the same as the bogus LINK_MAX in <linux/limits.h>. Oh well. */
  17 #define MINIX_LINK_MAX  250
  18 #define MINIX2_LINK_MAX 65530
  19
  20 #define MINIX_I_MAP_SLOTS       8
  21 #define MINIX_Z_MAP_SLOTS       64
  22 #define MINIX_SUPER_MAGIC       0x137F          /* original minix fs */
  23 #define MINIX_SUPER_MAGIC2      0x138F          /* minix fs, 30 char names */
  24 #define MINIX2_SUPER_MAGIC      0x2468          /* minix V2 fs */
  25 #define MINIX2_SUPER_MAGIC2     0x2478          /* minix V2 fs, 30 char names */
  26 #define MINIX_VALID_FS          0x0001          /* Clean fs. */
  27 #define MINIX_ERROR_FS          0x0002          /* fs has errors. */
  28
  29 #define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode)))
  30 #define MINIX2_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix2_inode)))
  31
  32 /*
  33  * This is the original minix inode layout on disk.
  34  * Note the 8-bit gid and atime and ctime.
  35  */
  36 struct minix_inode {
  37         __u16 i_mode;
  38         __u16 i_uid;
  39         __u32 i_size;
  40         __u32 i_time;
  41         __u8  i_gid;
  42         __u8  i_nlinks;
  43         __u16 i_zone[9];
  44 };
  45
  46 /*
  47  * The new minix inode has all the time entries, as well as
  48  * long block numbers and a third indirect block (7+1+1+1
  49  * instead of 7+1+1). Also, some previously 8-bit values are
  50  * now 16-bit. The inode is now 64 bytes instead of 32.
  51  */
  52 struct minix2_inode {
  53         __u16 i_mode;
  54         __u16 i_nlinks;
  55         __u16 i_uid;
  56         __u16 i_gid;
  57         __u32 i_size;
  58         __u32 i_atime;
  59         __u32 i_mtime;
  60         __u32 i_ctime;
  61         __u32 i_zone[10];
  62 };
  63
  64 /*
  65  * minix super-block data on disk
  66  */
  67 struct minix_super_block {
  68         __u16 s_ninodes;
  69         __u16 s_nzones;
  70         __u16 s_imap_blocks;
  71         __u16 s_zmap_blocks;
  72         __u16 s_firstdatazone;
  73         __u16 s_log_zone_size;
  74         __u32 s_max_size;
  75         __u16 s_magic;
  76         __u16 s_state;
  77         __u32 s_zones;
  78 };
  79
  80 struct minix_dir_entry {
  81         __u16 inode;
  82         char name[0];
  83 };
  84
  85 #endif