1#ifndef FS_MINIX_H
2#define FS_MINIX_H
3
4#include <linux/fs.h>
5#include <linux/pagemap.h>
6#include <linux/minix_fs.h>
7
8#define INODE_VERSION(inode)	minix_sb(inode->i_sb)->s_version
9#define MINIX_V1		0x0001		/* original minix fs */
10#define MINIX_V2		0x0002		/* minix V2 fs */
11#define MINIX_V3		0x0003		/* minix V3 fs */
12
13/*
14 * minix fs inode data in memory
15 */
16struct minix_inode_info {
17	union {
18		__u16 i1_data[16];
19		__u32 i2_data[16];
20	} u;
21	struct inode vfs_inode;
22};
23
24/*
25 * minix super-block data in memory
26 */
27struct minix_sb_info {
28	unsigned long s_ninodes;
29	unsigned long s_nzones;
30	unsigned long s_imap_blocks;
31	unsigned long s_zmap_blocks;
32	unsigned long s_firstdatazone;
33	unsigned long s_log_zone_size;
34	unsigned long s_max_size;
35	int s_dirsize;
36	int s_namelen;
37	struct buffer_head ** s_imap;
38	struct buffer_head ** s_zmap;
39	struct buffer_head * s_sbh;
40	struct minix_super_block * s_ms;
41	unsigned short s_mount_state;
42	unsigned short s_version;
43};
44
45extern struct inode *minix_iget(struct super_block *, unsigned long);
46extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
47extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
48extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
49extern void minix_free_inode(struct inode * inode);
50extern unsigned long minix_count_free_inodes(struct super_block *sb);
51extern int minix_new_block(struct inode * inode);
52extern void minix_free_block(struct inode *inode, unsigned long block);
53extern unsigned long minix_count_free_blocks(struct super_block *sb);
54extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);
55extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
56
57extern void V1_minix_truncate(struct inode *);
58extern void V2_minix_truncate(struct inode *);
59extern void minix_truncate(struct inode *);
60extern void minix_set_inode(struct inode *, dev_t);
61extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
62extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
63extern unsigned V1_minix_blocks(loff_t, struct super_block *);
64extern unsigned V2_minix_blocks(loff_t, struct super_block *);
65
66extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
67extern int minix_add_link(struct dentry*, struct inode*);
68extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
69extern int minix_make_empty(struct inode*, struct inode*);
70extern int minix_empty_dir(struct inode*);
71extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
72extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
73extern ino_t minix_inode_by_name(struct dentry*);
74
75extern const struct inode_operations minix_file_inode_operations;
76extern const struct inode_operations minix_dir_inode_operations;
77extern const struct file_operations minix_file_operations;
78extern const struct file_operations minix_dir_operations;
79
80static inline struct minix_sb_info *minix_sb(struct super_block *sb)
81{
82	return sb->s_fs_info;
83}
84
85static inline struct minix_inode_info *minix_i(struct inode *inode)
86{
87	return list_entry(inode, struct minix_inode_info, vfs_inode);
88}
89
90static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
91{
92	return DIV_ROUND_UP(bits, blocksize * 8);
93}
94
95#if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
96	defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
97
98#error Minix file system byte order broken
99
100#elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
101
102/*
103 * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
104 * little-endian bitmaps on little-endian system
105 */
106
107#define minix_test_and_set_bit(nr, addr)	\
108	__test_and_set_bit((nr), (unsigned long *)(addr))
109#define minix_set_bit(nr, addr)		\
110	__set_bit((nr), (unsigned long *)(addr))
111#define minix_test_and_clear_bit(nr, addr) \
112	__test_and_clear_bit((nr), (unsigned long *)(addr))
113#define minix_test_bit(nr, addr)		\
114	test_bit((nr), (unsigned long *)(addr))
115#define minix_find_first_zero_bit(addr, size) \
116	find_first_zero_bit((unsigned long *)(addr), (size))
117
118#elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
119
120/*
121 * big-endian 16bit indexed bitmaps
122 */
123
124static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
125{
126	const unsigned short *p = vaddr, *addr = vaddr;
127	unsigned short num;
128
129	if (!size)
130		return 0;
131
132	size >>= 4;
133	while (*p++ == 0xffff) {
134		if (--size == 0)
135			return (p - addr) << 4;
136	}
137
138	num = *--p;
139	return ((p - addr) << 4) + ffz(num);
140}
141
142#define minix_test_and_set_bit(nr, addr)	\
143	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
144#define minix_set_bit(nr, addr)	\
145	__set_bit((nr) ^ 16, (unsigned long *)(addr))
146#define minix_test_and_clear_bit(nr, addr)	\
147	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
148
149static inline int minix_test_bit(int nr, const void *vaddr)
150{
151	const unsigned short *p = vaddr;
152	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
153}
154
155#else
156
157/*
158 * little-endian bitmaps
159 */
160
161#define minix_test_and_set_bit	__test_and_set_bit_le
162#define minix_set_bit		__set_bit_le
163#define minix_test_and_clear_bit	__test_and_clear_bit_le
164#define minix_test_bit	test_bit_le
165#define minix_find_first_zero_bit	find_first_zero_bit_le
166
167#endif
168
169#endif /* FS_MINIX_H */
170