Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
e38be994 HM |
2 | #ifndef FS_MINIX_H |
3 | #define FS_MINIX_H | |
4 | ||
1da177e4 LT |
5 | #include <linux/fs.h> |
6 | #include <linux/pagemap.h> | |
7 | #include <linux/minix_fs.h> | |
8 | ||
1da177e4 | 9 | #define INODE_VERSION(inode) minix_sb(inode->i_sb)->s_version |
1da177e4 LT |
10 | #define MINIX_V1 0x0001 /* original minix fs */ |
11 | #define MINIX_V2 0x0002 /* minix V2 fs */ | |
939b00df | 12 | #define MINIX_V3 0x0003 /* minix V3 fs */ |
1da177e4 LT |
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; | |
1da177e4 LT |
35 | int s_dirsize; |
36 | int s_namelen; | |
1da177e4 LT |
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 | ||
a90a0880 | 45 | extern struct inode *minix_iget(struct super_block *, unsigned long); |
1da177e4 LT |
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 **); | |
4a29a126 | 48 | extern struct inode * minix_new_inode(const struct inode *, umode_t); |
1da177e4 | 49 | extern void minix_free_inode(struct inode * inode); |
016e8d44 | 50 | extern unsigned long minix_count_free_inodes(struct super_block *sb); |
1da177e4 | 51 | extern int minix_new_block(struct inode * inode); |
939b00df | 52 | extern void minix_free_block(struct inode *inode, unsigned long block); |
016e8d44 | 53 | extern unsigned long minix_count_free_blocks(struct super_block *sb); |
b74d24f7 | 54 | extern int minix_getattr(struct mnt_idmap *, const struct path *, |
549c7297 | 55 | struct kstat *, u32, unsigned int); |
f4e420dc | 56 | extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len); |
1da177e4 | 57 | |
1da177e4 LT |
58 | extern void V1_minix_truncate(struct inode *); |
59 | extern void V2_minix_truncate(struct inode *); | |
60 | extern void minix_truncate(struct inode *); | |
1da177e4 LT |
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); | |
939b00df AB |
64 | extern unsigned V1_minix_blocks(loff_t, struct super_block *); |
65 | extern unsigned V2_minix_blocks(loff_t, struct super_block *); | |
1da177e4 LT |
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*); | |
2d1a9d59 CH |
72 | int minix_set_link(struct minix_dir_entry *de, struct page *page, |
73 | struct inode *inode); | |
1da177e4 LT |
74 | extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**); |
75 | extern ino_t minix_inode_by_name(struct dentry*); | |
1da177e4 | 76 | |
92e1d5be AV |
77 | extern const struct inode_operations minix_file_inode_operations; |
78 | extern const struct inode_operations minix_dir_inode_operations; | |
4b6f5d20 AV |
79 | extern const struct file_operations minix_file_operations; |
80 | extern const struct file_operations minix_dir_operations; | |
1da177e4 LT |
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 | { | |
db6172c4 | 89 | return container_of(inode, struct minix_inode_info, vfs_inode); |
1da177e4 | 90 | } |
e38be994 | 91 | |
016e8d44 JB |
92 | static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize) |
93 | { | |
94 | return DIV_ROUND_UP(bits, blocksize * 8); | |
95 | } | |
96 | ||
61f2e7b0 AM |
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 | ||
f1fd306a | 134 | size >>= 4; |
61f2e7b0 AM |
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 | ||
e38be994 | 171 | #endif /* FS_MINIX_H */ |