root/include/uapi/linux/minix_fs.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _LINUX_MINIX_FS_H
   3 #define _LINUX_MINIX_FS_H
   4 
   5 #include <linux/types.h>
   6 #include <linux/magic.h>
   7 
   8 /*
   9  * The minix filesystem constants/structures
  10  */
  11 
  12 /*
  13  * Thanks to Kees J Bot for sending me the definitions of the new
  14  * minix filesystem (aka V2) with bigger inodes and 32-bit block
  15  * pointers.
  16  */
  17 
  18 #define MINIX_ROOT_INO 1
  19 
  20 /* Not the same as the bogus LINK_MAX in <linux/limits.h>. Oh well. */
  21 #define MINIX_LINK_MAX  250
  22 #define MINIX2_LINK_MAX 65530
  23 
  24 #define MINIX_I_MAP_SLOTS       8
  25 #define MINIX_Z_MAP_SLOTS       64
  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 
  31 /*
  32  * This is the original minix inode layout on disk.
  33  * Note the 8-bit gid and atime and ctime.
  34  */
  35 struct minix_inode {
  36         __u16 i_mode;
  37         __u16 i_uid;
  38         __u32 i_size;
  39         __u32 i_time;
  40         __u8  i_gid;
  41         __u8  i_nlinks;
  42         __u16 i_zone[9];
  43 };
  44 
  45 /*
  46  * The new minix inode has all the time entries, as well as
  47  * long block numbers and a third indirect block (7+1+1+1
  48  * instead of 7+1+1). Also, some previously 8-bit values are
  49  * now 16-bit. The inode is now 64 bytes instead of 32.
  50  */
  51 struct minix2_inode {
  52         __u16 i_mode;
  53         __u16 i_nlinks;
  54         __u16 i_uid;
  55         __u16 i_gid;
  56         __u32 i_size;
  57         __u32 i_atime;
  58         __u32 i_mtime;
  59         __u32 i_ctime;
  60         __u32 i_zone[10];
  61 };
  62 
  63 /*
  64  * minix super-block data on disk
  65  */
  66 struct minix_super_block {
  67         __u16 s_ninodes;
  68         __u16 s_nzones;
  69         __u16 s_imap_blocks;
  70         __u16 s_zmap_blocks;
  71         __u16 s_firstdatazone;
  72         __u16 s_log_zone_size;
  73         __u32 s_max_size;
  74         __u16 s_magic;
  75         __u16 s_state;
  76         __u32 s_zones;
  77 };
  78 
  79 /*
  80  * V3 minix super-block data on disk
  81  */
  82 struct minix3_super_block {
  83         __u32 s_ninodes;
  84         __u16 s_pad0;
  85         __u16 s_imap_blocks;
  86         __u16 s_zmap_blocks;
  87         __u16 s_firstdatazone;
  88         __u16 s_log_zone_size;
  89         __u16 s_pad1;
  90         __u32 s_max_size;
  91         __u32 s_zones;
  92         __u16 s_magic;
  93         __u16 s_pad2;
  94         __u16 s_blocksize;
  95         __u8  s_disk_version;
  96 };
  97 
  98 struct minix_dir_entry {
  99         __u16 inode;
 100         char name[0];
 101 };
 102 
 103 struct minix3_dir_entry {
 104         __u32 inode;
 105         char name[0];
 106 };
 107 #endif