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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SEQ_FILE_H |
3 | #define _LINUX_SEQ_FILE_H | |
1da177e4 LT |
4 | |
5 | #include <linux/types.h> | |
6 | #include <linux/string.h> | |
187f1882 | 7 | #include <linux/bug.h> |
0ac1759a | 8 | #include <linux/mutex.h> |
50ac2d69 AD |
9 | #include <linux/cpumask.h> |
10 | #include <linux/nodemask.h> | |
34dbbcdb LT |
11 | #include <linux/fs.h> |
12 | #include <linux/cred.h> | |
1da177e4 LT |
13 | |
14 | struct seq_operations; | |
1da177e4 LT |
15 | |
16 | struct seq_file { | |
17 | char *buf; | |
18 | size_t size; | |
19 | size_t from; | |
20 | size_t count; | |
839cc2a9 | 21 | size_t pad_until; |
1da177e4 | 22 | loff_t index; |
8f19d472 | 23 | loff_t read_pos; |
0ac1759a | 24 | struct mutex lock; |
15ad7cdc | 25 | const struct seq_operations *op; |
f1514638 | 26 | int poll_event; |
34dbbcdb | 27 | const struct file *file; |
1da177e4 LT |
28 | void *private; |
29 | }; | |
30 | ||
31 | struct seq_operations { | |
32 | void * (*start) (struct seq_file *m, loff_t *pos); | |
33 | void (*stop) (struct seq_file *m, void *v); | |
34 | void * (*next) (struct seq_file *m, void *v, loff_t *pos); | |
35 | int (*show) (struct seq_file *m, void *v); | |
36 | }; | |
37 | ||
521b5d0c AV |
38 | #define SEQ_SKIP 1 |
39 | ||
1f33c41c JP |
40 | /** |
41 | * seq_has_overflowed - check if the buffer has overflowed | |
42 | * @m: the seq_file handle | |
43 | * | |
44 | * seq_files have a buffer which may overflow. When this happens a larger | |
45 | * buffer is reallocated and all the data will be printed again. | |
46 | * The overflow state is true when m->count == m->size. | |
47 | * | |
48 | * Returns true if the buffer received more than it can hold. | |
49 | */ | |
50 | static inline bool seq_has_overflowed(struct seq_file *m) | |
51 | { | |
52 | return m->count == m->size; | |
53 | } | |
54 | ||
f8439806 MS |
55 | /** |
56 | * seq_get_buf - get buffer to write arbitrary data to | |
57 | * @m: the seq_file handle | |
58 | * @bufp: the beginning of the buffer is stored here | |
59 | * | |
60 | * Return the number of bytes available in the buffer, or zero if | |
61 | * there's no space. | |
62 | */ | |
63 | static inline size_t seq_get_buf(struct seq_file *m, char **bufp) | |
64 | { | |
65 | BUG_ON(m->count > m->size); | |
66 | if (m->count < m->size) | |
67 | *bufp = m->buf + m->count; | |
68 | else | |
69 | *bufp = NULL; | |
70 | ||
71 | return m->size - m->count; | |
72 | } | |
73 | ||
74 | /** | |
75 | * seq_commit - commit data to the buffer | |
76 | * @m: the seq_file handle | |
77 | * @num: the number of bytes to commit | |
78 | * | |
79 | * Commit @num bytes of data written to a buffer previously acquired | |
80 | * by seq_buf_get. To signal an error condition, or that the data | |
81 | * didn't fit in the available space, pass a negative @num value. | |
82 | */ | |
83 | static inline void seq_commit(struct seq_file *m, int num) | |
84 | { | |
85 | if (num < 0) { | |
86 | m->count = m->size; | |
87 | } else { | |
88 | BUG_ON(m->count + num > m->size); | |
89 | m->count += num; | |
90 | } | |
91 | } | |
92 | ||
839cc2a9 TH |
93 | /** |
94 | * seq_setwidth - set padding width | |
95 | * @m: the seq_file handle | |
96 | * @size: the max number of bytes to pad. | |
97 | * | |
98 | * Call seq_setwidth() for setting max width, then call seq_printf() etc. and | |
99 | * finally call seq_pad() to pad the remaining bytes. | |
100 | */ | |
101 | static inline void seq_setwidth(struct seq_file *m, size_t size) | |
102 | { | |
103 | m->pad_until = m->count + size; | |
104 | } | |
105 | void seq_pad(struct seq_file *m, char c); | |
106 | ||
8c9379e9 | 107 | char *mangle_path(char *s, const char *p, const char *esc); |
15ad7cdc | 108 | int seq_open(struct file *, const struct seq_operations *); |
1da177e4 | 109 | ssize_t seq_read(struct file *, char __user *, size_t, loff_t *); |
d4d50710 | 110 | ssize_t seq_read_iter(struct kiocb *iocb, struct iov_iter *iter); |
1da177e4 LT |
111 | loff_t seq_lseek(struct file *, loff_t, int); |
112 | int seq_release(struct inode *, struct file *); | |
0b923606 | 113 | int seq_write(struct seq_file *seq, const void *data, size_t len); |
1da177e4 | 114 | |
6798a8ca JP |
115 | __printf(2, 0) |
116 | void seq_vprintf(struct seq_file *m, const char *fmt, va_list args); | |
117 | __printf(2, 3) | |
118 | void seq_printf(struct seq_file *m, const char *fmt, ...); | |
119 | void seq_putc(struct seq_file *m, char c); | |
120 | void seq_puts(struct seq_file *m, const char *s); | |
d1be35cb AV |
121 | void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter, |
122 | unsigned long long num, unsigned int width); | |
75ba1d07 | 123 | void seq_put_decimal_ull(struct seq_file *m, const char *delimiter, |
6798a8ca | 124 | unsigned long long num); |
75ba1d07 | 125 | void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num); |
0e3dc019 AV |
126 | void seq_put_hex_ll(struct seq_file *m, const char *delimiter, |
127 | unsigned long long v, unsigned int width); | |
128 | ||
6798a8ca | 129 | void seq_escape(struct seq_file *m, const char *s, const char *esc); |
ea053e16 | 130 | void seq_escape_mem_ascii(struct seq_file *m, const char *src, size_t isz); |
1da177e4 | 131 | |
37607102 AS |
132 | void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type, |
133 | int rowsize, int groupsize, const void *buf, size_t len, | |
134 | bool ascii); | |
135 | ||
8c9379e9 | 136 | int seq_path(struct seq_file *, const struct path *, const char *); |
2726d566 | 137 | int seq_file_path(struct seq_file *, struct file *, const char *); |
8c9379e9 AV |
138 | int seq_dentry(struct seq_file *, struct dentry *, const char *); |
139 | int seq_path_root(struct seq_file *m, const struct path *path, | |
140 | const struct path *root, const char *esc); | |
3eda2011 | 141 | |
1da177e4 | 142 | int single_open(struct file *, int (*)(struct seq_file *, void *), void *); |
2043f495 | 143 | int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t); |
1da177e4 | 144 | int single_release(struct inode *, struct file *); |
39699037 PE |
145 | void *__seq_open_private(struct file *, const struct seq_operations *, int); |
146 | int seq_open_private(struct file *, const struct seq_operations *, int); | |
1da177e4 LT |
147 | int seq_release_private(struct inode *, struct file *); |
148 | ||
76d6a133 FR |
149 | #ifdef CONFIG_BINARY_PRINTF |
150 | void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary); | |
151 | #endif | |
152 | ||
d2c0e6e9 KW |
153 | #define DEFINE_SEQ_ATTRIBUTE(__name) \ |
154 | static int __name ## _open(struct inode *inode, struct file *file) \ | |
155 | { \ | |
156 | int ret = seq_open(file, &__name ## _sops); \ | |
157 | if (!ret && inode->i_private) { \ | |
158 | struct seq_file *seq_f = file->private_data; \ | |
159 | seq_f->private = inode->i_private; \ | |
160 | } \ | |
161 | return ret; \ | |
162 | } \ | |
163 | \ | |
164 | static const struct file_operations __name ## _fops = { \ | |
165 | .owner = THIS_MODULE, \ | |
166 | .open = __name ## _open, \ | |
167 | .read = seq_read, \ | |
168 | .llseek = seq_lseek, \ | |
169 | .release = seq_release, \ | |
170 | } | |
171 | ||
a08f06bb AS |
172 | #define DEFINE_SHOW_ATTRIBUTE(__name) \ |
173 | static int __name ## _open(struct inode *inode, struct file *file) \ | |
174 | { \ | |
175 | return single_open(file, __name ## _show, inode->i_private); \ | |
176 | } \ | |
177 | \ | |
178 | static const struct file_operations __name ## _fops = { \ | |
179 | .owner = THIS_MODULE, \ | |
180 | .open = __name ## _open, \ | |
181 | .read = seq_read, \ | |
182 | .llseek = seq_lseek, \ | |
183 | .release = single_release, \ | |
184 | } | |
185 | ||
97a32539 AD |
186 | #define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \ |
187 | static int __name ## _open(struct inode *inode, struct file *file) \ | |
188 | { \ | |
189 | return single_open(file, __name ## _show, inode->i_private); \ | |
190 | } \ | |
191 | \ | |
192 | static const struct proc_ops __name ## _proc_ops = { \ | |
193 | .proc_open = __name ## _open, \ | |
194 | .proc_read = seq_read, \ | |
195 | .proc_lseek = seq_lseek, \ | |
196 | .proc_release = single_release, \ | |
197 | } | |
198 | ||
adb37c4c EB |
199 | static inline struct user_namespace *seq_user_ns(struct seq_file *seq) |
200 | { | |
201 | #ifdef CONFIG_USER_NS | |
34dbbcdb | 202 | return seq->file->f_cred->user_ns; |
adb37c4c EB |
203 | #else |
204 | extern struct user_namespace init_user_ns; | |
205 | return &init_user_ns; | |
206 | #endif | |
207 | } | |
208 | ||
a068acf2 KC |
209 | /** |
210 | * seq_show_options - display mount options with appropriate escapes. | |
211 | * @m: the seq_file handle | |
212 | * @name: the mount option name | |
213 | * @value: the mount option name's value, can be NULL | |
214 | */ | |
215 | static inline void seq_show_option(struct seq_file *m, const char *name, | |
216 | const char *value) | |
217 | { | |
218 | seq_putc(m, ','); | |
219 | seq_escape(m, name, ",= \t\n\\"); | |
220 | if (value) { | |
221 | seq_putc(m, '='); | |
222 | seq_escape(m, value, ", \t\n\\"); | |
223 | } | |
224 | } | |
225 | ||
226 | /** | |
227 | * seq_show_option_n - display mount options with appropriate escapes | |
228 | * where @value must be a specific length. | |
229 | * @m: the seq_file handle | |
230 | * @name: the mount option name | |
231 | * @value: the mount option name's value, cannot be NULL | |
232 | * @length: the length of @value to display | |
233 | * | |
234 | * This is a macro since this uses "length" to define the size of the | |
235 | * stack buffer. | |
236 | */ | |
237 | #define seq_show_option_n(m, name, value, length) { \ | |
238 | char val_buf[length + 1]; \ | |
239 | strncpy(val_buf, value, length); \ | |
240 | val_buf[length] = '\0'; \ | |
241 | seq_show_option(m, name, val_buf); \ | |
242 | } | |
243 | ||
1da177e4 | 244 | #define SEQ_START_TOKEN ((void *)1) |
bcf67e16 PE |
245 | /* |
246 | * Helpers for iteration over list_head-s in seq_files | |
247 | */ | |
248 | ||
249 | extern struct list_head *seq_list_start(struct list_head *head, | |
250 | loff_t pos); | |
251 | extern struct list_head *seq_list_start_head(struct list_head *head, | |
252 | loff_t pos); | |
253 | extern struct list_head *seq_list_next(void *v, struct list_head *head, | |
254 | loff_t *ppos); | |
255 | ||
66655de6 LZ |
256 | /* |
257 | * Helpers for iteration over hlist_head-s in seq_files | |
258 | */ | |
259 | ||
260 | extern struct hlist_node *seq_hlist_start(struct hlist_head *head, | |
1cc52327 | 261 | loff_t pos); |
66655de6 | 262 | extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head, |
1cc52327 | 263 | loff_t pos); |
66655de6 | 264 | extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head, |
1cc52327 | 265 | loff_t *ppos); |
266 | ||
267 | extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head, | |
268 | loff_t pos); | |
269 | extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head, | |
270 | loff_t pos); | |
271 | extern struct hlist_node *seq_hlist_next_rcu(void *v, | |
272 | struct hlist_head *head, | |
273 | loff_t *ppos); | |
0bc77381 JL |
274 | |
275 | /* Helpers for iterating over per-cpu hlist_head-s in seq_files */ | |
276 | extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos); | |
277 | ||
278 | extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos); | |
279 | ||
09652320 | 280 | void seq_file_init(void); |
1da177e4 | 281 | #endif |