aboutsummaryrefslogtreecommitdiff
path: root/include/linux/seq_file.h
blob: 52e0097f61f00108f0faec9b37c57c2f03e1fcb2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
#ifndef _LINUX_SEQ_FILE_H
#define _LINUX_SEQ_FILE_H

#include <linux/types.h>
#include <linux/string.h>
#include <linux/bug.h>
#include <linux/mutex.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>

struct seq_operations;
struct file;
struct path;
struct inode;
struct dentry;
struct user_namespace;

struct seq_file {
	char *buf;
	size_t size;
	size_t from;
	size_t count;
	size_t pad_until;
	loff_t index;
	loff_t read_pos;
	u64 version;
	struct mutex lock;
	const struct seq_operations *op;
	int poll_event;
#ifdef CONFIG_USER_NS
	struct user_namespace *user_ns;
#endif
	void *private;
};

struct seq_operations {
	void * (*start) (struct seq_file *m, loff_t *pos);
	void (*stop) (struct seq_file *m, void *v);
	void * (*next) (struct seq_file *m, void *v, loff_t *pos);
	int (*show) (struct seq_file *m, void *v);
};

#define SEQ_SKIP 1

/**
 * seq_get_buf - get buffer to write arbitrary data to
 * @m: the seq_file handle
 * @bufp: the beginning of the buffer is stored here
 *
 * Return the number of bytes available in the buffer, or zero if
 * there's no space.
 */
static inline size_t seq_get_buf(struct seq_file *m, char **bufp)
{
	BUG_ON(m->count > m->size);
	if (m->count < m->size)
		*bufp = m->buf + m->count;
	else
		*bufp = NULL;

	return m->size - m->count;
}

/**
 * seq_commit - commit data to the buffer
 * @m: the seq_file handle
 * @num: the number of bytes to commit
 *
 * Commit @num bytes of data written to a buffer previously acquired
 * by seq_buf_get.  To signal an error condition, or that the data
 * didn't fit in the available space, pass a negative @num value.
 */
static inline void seq_commit(struct seq_file *m, int num)
{
	if (num < 0) {
		m->count = m->size;
	} else {
		BUG_ON(m->count + num > m->size);
		m->count += num;
	}
}

/**
 * seq_setwidth - set padding width
 * @m: the seq_file handle
 * @size: the max number of bytes to pad.
 *
 * Call seq_setwidth() for setting max width, then call seq_printf() etc. and
 * finally call seq_pad() to pad the remaining bytes.
 */
static inline void seq_setwidth(struct seq_file *m, size_t size)
{
	m->pad_until = m->count + size;
}
void seq_pad(struct seq_file *m, char c);

char *mangle_path(char *s, const char *p, const char *esc);
int seq_open(struct file *, const struct seq_operations *);
ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
loff_t seq_lseek(struct file *, loff_t, int);
int seq_release(struct inode *, struct file *);
int seq_escape(struct seq_file *, const char *, const char *);
int seq_putc(struct seq_file *m, char c);
int seq_puts(struct seq_file *m, const char *s);
int seq_write(struct seq_file *seq, const void *data, size_t len);

__printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
__printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);

int seq_path(struct seq_file *, const struct path *, const char *);
int seq_dentry(struct seq_file *, struct dentry *, const char *);
int seq_path_root(struct seq_file *m, const struct path *path,
		  const struct path *root, const char *esc);
int seq_bitmap(struct seq_file *m, const unsigned long *bits,
				   unsigned int nr_bits);
static inline int seq_cpumask(struct seq_file *m, const struct cpumask *mask)
{
	return seq_bitmap(m, cpumask_bits(mask), nr_cpu_ids);
}

static inline int seq_nodemask(struct seq_file *m, nodemask_t *mask)
{
	return seq_bitmap(m, mask->bits, MAX_NUMNODES);
}

int seq_bitmap_list(struct seq_file *m, const unsigned long *bits,
		unsigned int nr_bits);

static inline int seq_cpumask_list(struct seq_file *m,
				   const struct cpumask *mask)
{
	return seq_bitmap_list(m, cpumask_bits(mask), nr_cpu_ids);
}

static inline int seq_nodemask_list(struct seq_file *m, nodemask_t *mask)
{
	return seq_bitmap_list(m, mask->bits, MAX_NUMNODES);
}

int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
int single_release(struct inode *, struct file *);
void *__seq_open_private(struct file *, const struct seq_operations *, int);
int seq_open_private(struct file *, const struct seq_operations *, int);
int seq_release_private(struct inode *, struct file *);
int seq_put_decimal_ull(struct seq_file *m, char delimiter,
			unsigned long long num);
int seq_put_decimal_ll(struct seq_file *m, char delimiter,
			long long num);

static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
#ifdef CONFIG_USER_NS
	return seq->user_ns;
#else
	extern struct user_namespace init_user_ns;
	return &init_user_ns;
#endif
}

#define SEQ_START_TOKEN ((void *)1)
/*
 * Helpers for iteration over list_head-s in seq_files
 */

extern struct list_head *seq_list_start(struct list_head *head,
		loff_t pos);
extern struct list_head *seq_list_start_head(struct list_head *head,
		loff_t pos);
extern struct list_head *seq_list_next(void *v, struct list_head *head,
		loff_t *ppos);

/*
 * Helpers for iteration over hlist_head-s in seq_files
 */

extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
					  loff_t pos);
extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
					       loff_t pos);
extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
					 loff_t *ppos);

extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
					      loff_t pos);
extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
						   loff_t pos);
extern struct hlist_node *seq_hlist_next_rcu(void *v,
						   struct hlist_head *head,
						   loff_t *ppos);

/* Helpers for iterating over per-cpu hlist_head-s in seq_files */
extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos);

extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);

#endif