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 #define MINIX_V1 0x0001 /* original minix fs */
33 #define MINIX_V2 0x0002 /* minix V2 fs */
34
35 #define INODE_VERSION(inode) inode->i_sb->u.minix_sb.s_version
36
37 /*
38 * This is the original minix inode layout on disk.
39 * Note the 8-bit gid and atime and ctime.
40 */
41 struct minix_inode {
42 __u16 i_mode;
43 __u16 i_uid;
44 __u32 i_size;
45 __u32 i_time;
46 __u8 i_gid;
47 __u8 i_nlinks;
48 __u16 i_zone[9];
49 };
50
51 /*
52 * The new minix inode has all the time entries, as well as
53 * long block numbers and a third indirect block (7+1+1+1
54 * instead of 7+1+1). Also, some previously 8-bit values are
55 * now 16-bit. The inode is now 64 bytes instead of 32.
56 */
57 struct minix2_inode {
58 __u16 i_mode;
59 __u16 i_nlinks;
60 __u16 i_uid;
61 __u16 i_gid;
62 __u32 i_size;
63 __u32 i_atime;
64 __u32 i_mtime;
65 __u32 i_ctime;
66 __u32 i_zone[10];
67 };
68
69 /*
70 * minix super-block data on disk
71 */
72 struct minix_super_block {
73 __u16 s_ninodes;
74 __u16 s_nzones;
75 __u16 s_imap_blocks;
76 __u16 s_zmap_blocks;
77 __u16 s_firstdatazone;
78 __u16 s_log_zone_size;
79 __u32 s_max_size;
80 __u16 s_magic;
81 __u16 s_state;
82 __u32 s_zones;
83 };
84
85 struct minix_dir_entry {
86 __u16 inode;
87 char name[0];
88 };
89
90 #ifdef __KERNEL__
91
92 extern struct inode * minix_new_inode(const struct inode * dir, int * error);
93 extern void minix_free_inode(struct inode * inode);
94 extern unsigned long minix_count_free_inodes(struct super_block *sb);
95 extern int minix_new_block(struct inode * inode);
96 extern void minix_free_block(struct inode * inode, int block);
97 extern unsigned long minix_count_free_blocks(struct super_block *sb);
98
99 extern struct buffer_head * minix_getblk(struct inode *, int, int);
100 extern struct buffer_head * minix_bread(struct inode *, int, int);
101
102 extern void V1_minix_truncate(struct inode *);
103 extern void V2_minix_truncate(struct inode *);
104 extern void minix_truncate(struct inode *);
105 extern int minix_sync_inode(struct inode *);
106 extern int V1_minix_sync_file(struct inode *);
107 extern int V2_minix_sync_file(struct inode *);
108 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
109 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
110
111 extern struct address_space_operations minix_aops;
112 extern struct inode_operations minix_file_inode_operations;
113 extern struct inode_operations minix_dir_inode_operations;
114 extern struct file_operations minix_file_operations;
115 extern struct file_operations minix_dir_operations;
116 extern struct dentry_operations minix_dentry_operations;
117
118 #endif /* __KERNEL__ */
119
120 #endif
121
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