1
2#ifndef _LINUX_SEQ_FILE_H
3#define _LINUX_SEQ_FILE_H
4
5#include <linux/types.h>
6#include <linux/string.h>
7#include <linux/bug.h>
8#include <linux/mutex.h>
9#include <linux/cpumask.h>
10#include <linux/nodemask.h>
11#include <linux/fs.h>
12#include <linux/cred.h>
13
14struct seq_operations;
15
16struct seq_file {
17 char *buf;
18 size_t size;
19 size_t from;
20 size_t count;
21 size_t pad_until;
22 loff_t index;
23 loff_t read_pos;
24 struct mutex lock;
25 const struct seq_operations *op;
26 int poll_event;
27 const struct file *file;
28 void *private;
29};
30
31struct 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
38#define SEQ_SKIP 1
39
40
41
42
43
44
45
46
47
48
49
50static inline bool seq_has_overflowed(struct seq_file *m)
51{
52 return m->count == m->size;
53}
54
55
56
57
58
59
60
61
62
63static 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
76
77
78
79
80
81
82
83static 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
93
94
95
96
97
98
99
100
101static inline void seq_setwidth(struct seq_file *m, size_t size)
102{
103 m->pad_until = m->count + size;
104}
105void seq_pad(struct seq_file *m, char c);
106
107char *mangle_path(char *s, const char *p, const char *esc);
108int seq_open(struct file *, const struct seq_operations *);
109ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
110ssize_t seq_read_iter(struct kiocb *iocb, struct iov_iter *iter);
111loff_t seq_lseek(struct file *, loff_t, int);
112int seq_release(struct inode *, struct file *);
113int seq_write(struct seq_file *seq, const void *data, size_t len);
114
115__printf(2, 0)
116void seq_vprintf(struct seq_file *m, const char *fmt, va_list args);
117__printf(2, 3)
118void seq_printf(struct seq_file *m, const char *fmt, ...);
119void seq_putc(struct seq_file *m, char c);
120void seq_puts(struct seq_file *m, const char *s);
121void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter,
122 unsigned long long num, unsigned int width);
123void seq_put_decimal_ull(struct seq_file *m, const char *delimiter,
124 unsigned long long num);
125void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num);
126void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
127 unsigned long long v, unsigned int width);
128
129void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
130 unsigned int flags, const char *esc);
131
132static inline void seq_escape_str(struct seq_file *m, const char *src,
133 unsigned int flags, const char *esc)
134{
135 seq_escape_mem(m, src, strlen(src), flags, esc);
136}
137
138void seq_escape(struct seq_file *m, const char *s, const char *esc);
139
140void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
141 int rowsize, int groupsize, const void *buf, size_t len,
142 bool ascii);
143
144int seq_path(struct seq_file *, const struct path *, const char *);
145int seq_file_path(struct seq_file *, struct file *, const char *);
146int seq_dentry(struct seq_file *, struct dentry *, const char *);
147int seq_path_root(struct seq_file *m, const struct path *path,
148 const struct path *root, const char *esc);
149
150int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
151int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
152int single_release(struct inode *, struct file *);
153void *__seq_open_private(struct file *, const struct seq_operations *, int);
154int seq_open_private(struct file *, const struct seq_operations *, int);
155int seq_release_private(struct inode *, struct file *);
156
157#ifdef CONFIG_BINARY_PRINTF
158void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary);
159#endif
160
161#define DEFINE_SEQ_ATTRIBUTE(__name) \
162static int __name ## _open(struct inode *inode, struct file *file) \
163{ \
164 int ret = seq_open(file, &__name ## _sops); \
165 if (!ret && inode->i_private) { \
166 struct seq_file *seq_f = file->private_data; \
167 seq_f->private = inode->i_private; \
168 } \
169 return ret; \
170} \
171 \
172static const struct file_operations __name ## _fops = { \
173 .owner = THIS_MODULE, \
174 .open = __name ## _open, \
175 .read = seq_read, \
176 .llseek = seq_lseek, \
177 .release = seq_release, \
178}
179
180#define DEFINE_SHOW_ATTRIBUTE(__name) \
181static int __name ## _open(struct inode *inode, struct file *file) \
182{ \
183 return single_open(file, __name ## _show, inode->i_private); \
184} \
185 \
186static const struct file_operations __name ## _fops = { \
187 .owner = THIS_MODULE, \
188 .open = __name ## _open, \
189 .read = seq_read, \
190 .llseek = seq_lseek, \
191 .release = single_release, \
192}
193
194#define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \
195static int __name ## _open(struct inode *inode, struct file *file) \
196{ \
197 return single_open(file, __name ## _show, inode->i_private); \
198} \
199 \
200static const struct proc_ops __name ## _proc_ops = { \
201 .proc_open = __name ## _open, \
202 .proc_read = seq_read, \
203 .proc_lseek = seq_lseek, \
204 .proc_release = single_release, \
205}
206
207static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
208{
209#ifdef CONFIG_USER_NS
210 return seq->file->f_cred->user_ns;
211#else
212 extern struct user_namespace init_user_ns;
213 return &init_user_ns;
214#endif
215}
216
217
218
219
220
221
222
223static inline void seq_show_option(struct seq_file *m, const char *name,
224 const char *value)
225{
226 seq_putc(m, ',');
227 seq_escape(m, name, ",= \t\n\\");
228 if (value) {
229 seq_putc(m, '=');
230 seq_escape(m, value, ", \t\n\\");
231 }
232}
233
234
235
236
237
238
239
240
241
242
243
244
245#define seq_show_option_n(m, name, value, length) { \
246 char val_buf[length + 1]; \
247 strncpy(val_buf, value, length); \
248 val_buf[length] = '\0'; \
249 seq_show_option(m, name, val_buf); \
250}
251
252#define SEQ_START_TOKEN ((void *)1)
253
254
255
256
257extern struct list_head *seq_list_start(struct list_head *head,
258 loff_t pos);
259extern struct list_head *seq_list_start_head(struct list_head *head,
260 loff_t pos);
261extern struct list_head *seq_list_next(void *v, struct list_head *head,
262 loff_t *ppos);
263
264
265
266
267
268extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
269 loff_t pos);
270extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
271 loff_t pos);
272extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
273 loff_t *ppos);
274
275extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
276 loff_t pos);
277extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
278 loff_t pos);
279extern struct hlist_node *seq_hlist_next_rcu(void *v,
280 struct hlist_head *head,
281 loff_t *ppos);
282
283
284extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos);
285
286extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);
287
288void seq_file_init(void);
289#endif
290