1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef FS_MINIX_H
3 #define FS_MINIX_H
4
5 #include <linux/fs.h>
6 #include <linux/pagemap.h>
7 #include <linux/minix_fs.h>
8
9 #define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version
10 #define MINIX_V1 0x0001 /* original minix fs */
11 #define MINIX_V2 0x0002 /* minix V2 fs */
12 #define MINIX_V3 0x0003 /* minix V3 fs */
13
14 /*
15 * minix fs inode data in memory
16 */
17 struct minix_inode_info {
18 union {
19 __u16 i1_data[16];
20 __u32 i2_data[16];
21 } u;
22 struct mapping_metadata_bhs i_metadata_bhs;
23 struct inode vfs_inode;
24 };
25
26 /*
27 * minix super-block data in memory
28 */
29 struct minix_sb_info {
30 unsigned long s_ninodes;
31 unsigned long s_nzones;
32 unsigned long s_imap_blocks;
33 unsigned long s_zmap_blocks;
34 unsigned long s_firstdatazone;
35 unsigned long s_log_zone_size;
36 int s_dirsize;
37 int s_namelen;
38 struct buffer_head ** s_imap;
39 struct buffer_head ** s_zmap;
40 struct buffer_head * s_sbh;
41 struct minix_super_block * s_ms;
42 unsigned short s_mount_state;
43 unsigned short s_version;
44 };
45
46 void __minix_error_inode(struct inode *inode, const char *function,
47 unsigned int line, const char *fmt, ...);
48
49 struct inode *minix_iget(struct super_block *, unsigned long);
50 struct minix_inode *minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
51 struct minix2_inode *minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
52 struct inode *minix_new_inode(const struct inode *, umode_t);
53 void minix_free_inode(struct inode *inode);
54 unsigned long minix_count_free_inodes(struct super_block *sb);
55 int minix_new_block(struct inode *inode);
56 void minix_free_block(struct inode *inode, unsigned long block);
57 unsigned long minix_count_free_blocks(struct super_block *sb);
58 int minix_getattr(struct mnt_idmap *, const struct path *,
59 struct kstat *, u32, unsigned int);
60 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);
61 struct mapping_metadata_bhs *minix_get_metadata_bhs(struct inode *inode);
62
63 extern void V1_minix_truncate(struct inode *);
64 extern void V2_minix_truncate(struct inode *);
65 extern void minix_truncate(struct inode *);
66 extern void minix_set_inode(struct inode *, dev_t);
67 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
68 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
69 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
70 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
71
72 struct minix_dir_entry *minix_find_entry(struct dentry *, struct folio **);
73 int minix_add_link(struct dentry*, struct inode*);
74 int minix_delete_entry(struct minix_dir_entry *, struct folio *);
75 int minix_make_empty(struct inode*, struct inode*);
76 int minix_empty_dir(struct inode*);
77 int minix_set_link(struct minix_dir_entry *de, struct folio *folio,
78 struct inode *inode);
79 struct minix_dir_entry *minix_dotdot(struct inode*, struct folio **);
80 ino_t minix_inode_by_name(struct dentry*);
81
82 extern const struct inode_operations minix_file_inode_operations;
83 extern const struct inode_operations minix_dir_inode_operations;
84 extern const struct file_operations minix_file_operations;
85 extern const struct file_operations minix_dir_operations;
86
minix_sb(struct super_block * sb)87 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
88 {
89 return sb->s_fs_info;
90 }
91
minix_i(struct inode * inode)92 static inline struct minix_inode_info *minix_i(struct inode *inode)
93 {
94 return container_of(inode, struct minix_inode_info, vfs_inode);
95 }
96
minix_blocks_needed(unsigned bits,unsigned blocksize)97 static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
98 {
99 return DIV_ROUND_UP_POW2(bits, blocksize * 8);
100 }
101
102 #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
103 defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
104
105 #error Minix file system byte order broken
106
107 #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
108
109 /*
110 * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
111 * little-endian bitmaps on little-endian system
112 */
113
114 #define minix_test_and_set_bit(nr, addr) \
115 __test_and_set_bit((nr), (unsigned long *)(addr))
116 #define minix_set_bit(nr, addr) \
117 __set_bit((nr), (unsigned long *)(addr))
118 #define minix_test_and_clear_bit(nr, addr) \
119 __test_and_clear_bit((nr), (unsigned long *)(addr))
120 #define minix_test_bit(nr, addr) \
121 test_bit((nr), (unsigned long *)(addr))
122 #define minix_find_first_zero_bit(addr, size) \
123 find_first_zero_bit((unsigned long *)(addr), (size))
124
125 #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
126
127 /*
128 * big-endian 16bit indexed bitmaps
129 */
130
minix_find_first_zero_bit(const void * vaddr,unsigned size)131 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
132 {
133 const unsigned short *p = vaddr, *addr = vaddr;
134 unsigned short num;
135
136 if (!size)
137 return 0;
138
139 size >>= 4;
140 while (*p++ == 0xffff) {
141 if (--size == 0)
142 return (p - addr) << 4;
143 }
144
145 num = *--p;
146 return ((p - addr) << 4) + ffz(num);
147 }
148
149 #define minix_test_and_set_bit(nr, addr) \
150 __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
151 #define minix_set_bit(nr, addr) \
152 __set_bit((nr) ^ 16, (unsigned long *)(addr))
153 #define minix_test_and_clear_bit(nr, addr) \
154 __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
155
minix_test_bit(int nr,const void * vaddr)156 static inline int minix_test_bit(int nr, const void *vaddr)
157 {
158 const unsigned short *p = vaddr;
159 return (p[nr >> 4] & (1U << (nr & 15))) != 0;
160 }
161
162 #else
163
164 /*
165 * little-endian bitmaps
166 */
167
168 #define minix_test_and_set_bit __test_and_set_bit_le
169 #define minix_set_bit __set_bit_le
170 #define minix_test_and_clear_bit __test_and_clear_bit_le
171 #define minix_test_bit test_bit_le
172 #define minix_find_first_zero_bit find_first_zero_bit_le
173
174 #endif
175
176 #define minix_error_inode(inode, fmt, ...) \
177 __minix_error_inode((inode), __func__, __LINE__, \
178 (fmt), ##__VA_ARGS__)
179
180 #endif /* FS_MINIX_H */
181