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[];
101 };
102
103 struct minix3_dir_entry {
104 __u32 inode;
105 char name[];
106 };
107 #endif
108
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