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 inode vfs_inode; |
23 | }; |
24 | |
25 | /* |
26 | * minix super-block data in memory |
27 | */ |
28 | struct minix_sb_info { |
29 | unsigned long s_ninodes; |
30 | unsigned long s_nzones; |
31 | unsigned long s_imap_blocks; |
32 | unsigned long s_zmap_blocks; |
33 | unsigned long s_firstdatazone; |
34 | unsigned long s_log_zone_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); |
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 mnt_idmap *, const struct path *, |
55 | struct kstat *, u32, unsigned int); |
56 | extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); |
57 | |
58 | extern void V1_minix_truncate(struct inode *); |
59 | extern void V2_minix_truncate(struct inode *); |
60 | extern void minix_truncate(struct inode *); |
61 | extern void minix_set_inode(struct inode *, dev_t); |
62 | extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int); |
63 | extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int); |
64 | extern unsigned V1_minix_blocks(loff_t, struct super_block *); |
65 | extern unsigned V2_minix_blocks(loff_t, struct super_block *); |
66 | |
67 | extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**); |
68 | extern int minix_add_link(struct dentry*, struct inode*); |
69 | extern int minix_delete_entry(struct minix_dir_entry*, struct page*); |
70 | extern int minix_make_empty(struct inode*, struct inode*); |
71 | extern int minix_empty_dir(struct inode*); |
72 | int minix_set_link(struct minix_dir_entry *de, struct page *page, |
73 | struct inode *inode); |
74 | extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); |
75 | extern ino_t minix_inode_by_name(struct dentry*); |
76 | |
77 | extern const struct inode_operations minix_file_inode_operations; |
78 | extern const struct inode_operations minix_dir_inode_operations; |
79 | extern const struct file_operations minix_file_operations; |
80 | extern const struct file_operations minix_dir_operations; |
81 | |
82 | static inline struct minix_sb_info *minix_sb(struct super_block *sb) |
83 | { |
84 | return sb->s_fs_info; |
85 | } |
86 | |
87 | static inline struct minix_inode_info *minix_i(struct inode *inode) |
88 | { |
89 | return container_of(inode, struct minix_inode_info, vfs_inode); |
90 | } |
91 | |
92 | static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) |
93 | { |
94 | return DIV_ROUND_UP(bits, blocksize * 8); |
95 | } |
96 | |
97 | #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \ |
98 | defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) |
99 | |
100 | #error Minix file system byte order broken |
101 | |
102 | #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) |
103 | |
104 | /* |
105 | * big-endian 32 or 64 bit indexed bitmaps on big-endian system or |
106 | * little-endian bitmaps on little-endian system |
107 | */ |
108 | |
109 | #define minix_test_and_set_bit(nr, addr) \ |
110 | __test_and_set_bit((nr), (unsigned long *)(addr)) |
111 | #define minix_set_bit(nr, addr) \ |
112 | __set_bit((nr), (unsigned long *)(addr)) |
113 | #define minix_test_and_clear_bit(nr, addr) \ |
114 | __test_and_clear_bit((nr), (unsigned long *)(addr)) |
115 | #define minix_test_bit(nr, addr) \ |
116 | test_bit((nr), (unsigned long *)(addr)) |
117 | #define minix_find_first_zero_bit(addr, size) \ |
118 | find_first_zero_bit((unsigned long *)(addr), (size)) |
119 | |
120 | #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED) |
121 | |
122 | /* |
123 | * big-endian 16bit indexed bitmaps |
124 | */ |
125 | |
126 | static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size) |
127 | { |
128 | const unsigned short *p = vaddr, *addr = vaddr; |
129 | unsigned short num; |
130 | |
131 | if (!size) |
132 | return 0; |
133 | |
134 | size >>= 4; |
135 | while (*p++ == 0xffff) { |
136 | if (--size == 0) |
137 | return (p - addr) << 4; |
138 | } |
139 | |
140 | num = *--p; |
141 | return ((p - addr) << 4) + ffz(num); |
142 | } |
143 | |
144 | #define minix_test_and_set_bit(nr, addr) \ |
145 | __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr)) |
146 | #define minix_set_bit(nr, addr) \ |
147 | __set_bit((nr) ^ 16, (unsigned long *)(addr)) |
148 | #define minix_test_and_clear_bit(nr, addr) \ |
149 | __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr)) |
150 | |
151 | static inline int minix_test_bit(int nr, const void *vaddr) |
152 | { |
153 | const unsigned short *p = vaddr; |
154 | return (p[nr >> 4] & (1U << (nr & 15))) != 0; |
155 | } |
156 | |
157 | #else |
158 | |
159 | /* |
160 | * little-endian bitmaps |
161 | */ |
162 | |
163 | #define minix_test_and_set_bit __test_and_set_bit_le |
164 | #define minix_set_bit __set_bit_le |
165 | #define minix_test_and_clear_bit __test_and_clear_bit_le |
166 | #define minix_test_bit test_bit_le |
167 | #define minix_find_first_zero_bit find_first_zero_bit_le |
168 | |
169 | #endif |
170 | |
171 | #endif /* FS_MINIX_H */ |
172 | |