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minix.h
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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  */
16 struct 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  */
27 struct 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 
45 extern struct inode *minix_iget(struct super_block *, unsigned long);
46 extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
47 extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
48 extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);
49 extern void minix_free_inode(struct inode * inode);
50 extern unsigned long minix_count_free_inodes(struct super_block *sb);
51 extern int minix_new_block(struct inode * inode);
52 extern void minix_free_block(struct inode *inode, unsigned long block);
53 extern unsigned long minix_count_free_blocks(struct super_block *sb);
54 extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);
55 extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
56 
57 extern void V1_minix_truncate(struct inode *);
58 extern void V2_minix_truncate(struct inode *);
59 extern void minix_truncate(struct inode *);
60 extern void minix_set_inode(struct inode *, dev_t);
61 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
62 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
63 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
64 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
65 
66 extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
67 extern int minix_add_link(struct dentry*, struct inode*);
68 extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
69 extern int minix_make_empty(struct inode*, struct inode*);
70 extern int minix_empty_dir(struct inode*);
71 extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
72 extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
73 extern ino_t minix_inode_by_name(struct dentry*);
74 
75 extern const struct inode_operations minix_file_inode_operations;
76 extern const struct inode_operations minix_dir_inode_operations;
77 extern const struct file_operations minix_file_operations;
78 extern const struct file_operations minix_dir_operations;
79 
80 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
81 {
82  return sb->s_fs_info;
83 }
84 
85 static inline struct minix_inode_info *minix_i(struct inode *inode)
86 {
87  return list_entry(inode, struct minix_inode_info, vfs_inode);
88 }
89 
90 static 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 
124 static 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 
149 static 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 */
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