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
10#define MINIX_V2 0x0002
11#define MINIX_V3 0x0003
12
13
14
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
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(const struct path *, struct kstat *, u32, unsigned int);
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 container_of(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
104
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
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
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
170
