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
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48
49
50static inline bool seq_has_overflowed(struct seq_file *m)
51{
52 return m->count == m->size;
53}
54
55
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58
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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
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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 *);
110loff_t seq_lseek(struct file *, loff_t, int);
111int seq_release(struct inode *, struct file *);
112int seq_write(struct seq_file *seq, const void *data, size_t len);
113
114__printf(2, 0)
115void seq_vprintf(struct seq_file *m, const char *fmt, va_list args);
116__printf(2, 3)
117void seq_printf(struct seq_file *m, const char *fmt, ...);
118void seq_putc(struct seq_file *m, char c);
119void seq_puts(struct seq_file *m, const char *s);
120void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter,
121 unsigned long long num, unsigned int width);
122void seq_put_decimal_ull(struct seq_file *m, const char *delimiter,
123 unsigned long long num);
124void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num);
125void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
126 unsigned long long v, unsigned int width);
127
128void seq_escape(struct seq_file *m, const char *s, const char *esc);
129void seq_escape_mem_ascii(struct seq_file *m, const char *src, size_t isz);
130
131void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
132 int rowsize, int groupsize, const void *buf, size_t len,
133 bool ascii);
134
135int seq_path(struct seq_file *, const struct path *, const char *);
136int seq_file_path(struct seq_file *, struct file *, const char *);
137int seq_dentry(struct seq_file *, struct dentry *, const char *);
138int seq_path_root(struct seq_file *m, const struct path *path,
139 const struct path *root, const char *esc);
140
141int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
142int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
143int single_release(struct inode *, struct file *);
144void *__seq_open_private(struct file *, const struct seq_operations *, int);
145int seq_open_private(struct file *, const struct seq_operations *, int);
146int seq_release_private(struct inode *, struct file *);
147
148#define DEFINE_SEQ_ATTRIBUTE(__name) \
149static int __name ## _open(struct inode *inode, struct file *file) \
150{ \
151 int ret = seq_open(file, &__name ## _sops); \
152 if (!ret && inode->i_private) { \
153 struct seq_file *seq_f = file->private_data; \
154 seq_f->private = inode->i_private; \
155 } \
156 return ret; \
157} \
158 \
159static const struct file_operations __name ## _fops = { \
160 .owner = THIS_MODULE, \
161 .open = __name ## _open, \
162 .read = seq_read, \
163 .llseek = seq_lseek, \
164 .release = seq_release, \
165}
166
167#define DEFINE_SHOW_ATTRIBUTE(__name) \
168static int __name ## _open(struct inode *inode, struct file *file) \
169{ \
170 return single_open(file, __name ## _show, inode->i_private); \
171} \
172 \
173static const struct file_operations __name ## _fops = { \
174 .owner = THIS_MODULE, \
175 .open = __name ## _open, \
176 .read = seq_read, \
177 .llseek = seq_lseek, \
178 .release = single_release, \
179}
180
181#define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \
182static int __name ## _open(struct inode *inode, struct file *file) \
183{ \
184 return single_open(file, __name ## _show, inode->i_private); \
185} \
186 \
187static const struct proc_ops __name ## _proc_ops = { \
188 .proc_open = __name ## _open, \
189 .proc_read = seq_read, \
190 .proc_lseek = seq_lseek, \
191 .proc_release = single_release, \
192}
193
194static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
195{
196#ifdef CONFIG_USER_NS
197 return seq->file->f_cred->user_ns;
198#else
199 extern struct user_namespace init_user_ns;
200 return &init_user_ns;
201#endif
202}
203
204
205
206
207
208
209
210static inline void seq_show_option(struct seq_file *m, const char *name,
211 const char *value)
212{
213 seq_putc(m, ',');
214 seq_escape(m, name, ",= \t\n\\");
215 if (value) {
216 seq_putc(m, '=');
217 seq_escape(m, value, ", \t\n\\");
218 }
219}
220
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230
231
232#define seq_show_option_n(m, name, value, length) { \
233 char val_buf[length + 1]; \
234 strncpy(val_buf, value, length); \
235 val_buf[length] = '\0'; \
236 seq_show_option(m, name, val_buf); \
237}
238
239#define SEQ_START_TOKEN ((void *)1)
240
241
242
243
244extern struct list_head *seq_list_start(struct list_head *head,
245 loff_t pos);
246extern struct list_head *seq_list_start_head(struct list_head *head,
247 loff_t pos);
248extern struct list_head *seq_list_next(void *v, struct list_head *head,
249 loff_t *ppos);
250
251
252
253
254
255extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
256 loff_t pos);
257extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
258 loff_t pos);
259extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
260 loff_t *ppos);
261
262extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
263 loff_t pos);
264extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
265 loff_t pos);
266extern struct hlist_node *seq_hlist_next_rcu(void *v,
267 struct hlist_head *head,
268 loff_t *ppos);
269
270
271extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos);
272
273extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);
274
275void seq_file_init(void);
276#endif
277