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      1 #ifndef _LINUX_MINIX_FS_H
      2 #define _LINUX_MINIX_FS_H
      3 
      4 #include <linux/types.h>
      5 #include <linux/magic.h>
      6 
      7 /*
      8  * The minix filesystem constants/structures
      9  */
     10 
     11 /*
     12  * Thanks to Kees J Bot for sending me the definitions of the new
     13  * minix filesystem (aka V2) with bigger inodes and 32-bit block
     14  * pointers.
     15  */
     16 
     17 #define MINIX_ROOT_INO 1
     18 
     19 /* Not the same as the bogus LINK_MAX in <linux/limits.h>. Oh well. */
     20 #define MINIX_LINK_MAX	250
     21 #define MINIX2_LINK_MAX	65530
     22 
     23 #define MINIX_I_MAP_SLOTS	8
     24 #define MINIX_Z_MAP_SLOTS	64
     25 #define MINIX_VALID_FS		0x0001		/* Clean fs. */
     26 #define MINIX_ERROR_FS		0x0002		/* fs has errors. */
     27 
     28 #define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode)))
     29 
     30 /*
     31  * This is the original minix inode layout on disk.
     32  * Note the 8-bit gid and atime and ctime.
     33  */
     34 struct minix_inode {
     35 	__u16 i_mode;
     36 	__u16 i_uid;
     37 	__u32 i_size;
     38 	__u32 i_time;
     39 	__u8  i_gid;
     40 	__u8  i_nlinks;
     41 	__u16 i_zone[9];
     42 };
     43 
     44 /*
     45  * The new minix inode has all the time entries, as well as
     46  * long block numbers and a third indirect block (7+1+1+1
     47  * instead of 7+1+1). Also, some previously 8-bit values are
     48  * now 16-bit. The inode is now 64 bytes instead of 32.
     49  */
     50 struct minix2_inode {
     51 	__u16 i_mode;
     52 	__u16 i_nlinks;
     53 	__u16 i_uid;
     54 	__u16 i_gid;
     55 	__u32 i_size;
     56 	__u32 i_atime;
     57 	__u32 i_mtime;
     58 	__u32 i_ctime;
     59 	__u32 i_zone[10];
     60 };
     61 
     62 /*
     63  * minix super-block data on disk
     64  */
     65 struct minix_super_block {
     66 	__u16 s_ninodes;
     67 	__u16 s_nzones;
     68 	__u16 s_imap_blocks;
     69 	__u16 s_zmap_blocks;
     70 	__u16 s_firstdatazone;
     71 	__u16 s_log_zone_size;
     72 	__u32 s_max_size;
     73 	__u16 s_magic;
     74 	__u16 s_state;
     75 	__u32 s_zones;
     76 };
     77 
     78 /*
     79  * V3 minix super-block data on disk
     80  */
     81 struct minix3_super_block {
     82 	__u32 s_ninodes;
     83 	__u16 s_pad0;
     84 	__u16 s_imap_blocks;
     85 	__u16 s_zmap_blocks;
     86 	__u16 s_firstdatazone;
     87 	__u16 s_log_zone_size;
     88 	__u16 s_pad1;
     89 	__u32 s_max_size;
     90 	__u32 s_zones;
     91 	__u16 s_magic;
     92 	__u16 s_pad2;
     93 	__u16 s_blocksize;
     94 	__u8  s_disk_version;
     95 };
     96 
     97 struct minix_dir_entry {
     98 	__u16 inode;
     99 	char name[0];
    100 };
    101 
    102 struct minix3_dir_entry {
    103 	__u32 inode;
    104 	char name[0];
    105 };
    106 #endif
    107