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
108