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 */
41struct 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 */
57struct 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 */
72struct 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
85struct minix_dir_entry {
86	__u16 inode;
87	char name[0];
88};
89
90#ifdef __KERNEL__
91
92/*
93 * change the define below to 0 if you want names > info->s_namelen chars to be
94 * truncated. Else they will be disallowed (ENAMETOOLONG).
95 */
96#define NO_TRUNCATE 1
97
98extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
99extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
100extern struct inode * minix_new_inode(const struct inode * dir, int * error);
101extern void minix_free_inode(struct inode * inode);
102extern unsigned long minix_count_free_inodes(struct super_block *sb);
103extern int minix_new_block(struct inode * inode);
104extern void minix_free_block(struct inode * inode, int block);
105extern unsigned long minix_count_free_blocks(struct super_block *sb);
106
107extern void V1_minix_truncate(struct inode *);
108extern void V2_minix_truncate(struct inode *);
109extern void minix_truncate(struct inode *);
110extern int minix_sync_inode(struct inode *);
111extern void minix_set_inode(struct inode *, dev_t);
112extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
113extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
114
115extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
116extern int minix_add_link(struct dentry*, struct inode*);
117extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
118extern int minix_make_empty(struct inode*, struct inode*);
119extern int minix_empty_dir(struct inode*);
120extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
121extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
122extern ino_t minix_inode_by_name(struct dentry*);
123
124extern int minix_sync_file(struct file *, struct dentry *, int);
125
126extern struct inode_operations minix_file_inode_operations;
127extern struct inode_operations minix_dir_inode_operations;
128extern struct file_operations minix_file_operations;
129extern struct file_operations minix_dir_operations;
130extern struct dentry_operations minix_dentry_operations;
131
132#endif /* __KERNEL__ */
133
134#endif
135