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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SEQ_FILE_H
2#define _LINUX_SEQ_FILE_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07003
4#include <linux/types.h>
5#include <linux/string.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -05006#include <linux/bug.h>
Ingo Molnar0ac17592006-03-23 03:00:37 -08007#include <linux/mutex.h>
Alexey Dobriyan50ac2d62008-08-12 15:09:02 -07008#include <linux/cpumask.h>
9#include <linux/nodemask.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11struct seq_operations;
12struct file;
Jan Blunckc32c2f62008-02-14 19:38:43 -080013struct path;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014struct inode;
Ram Pai6092d042008-03-27 13:06:20 +010015struct dentry;
Eric W. Biedermanadb37c42012-05-23 18:01:20 -060016struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18struct seq_file {
19 char *buf;
20 size_t size;
21 size_t from;
22 size_t count;
23 loff_t index;
Eric Biederman8f19d472009-02-18 14:48:16 -080024 loff_t read_pos;
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -070025 u64 version;
Ingo Molnar0ac17592006-03-23 03:00:37 -080026 struct mutex lock;
Helge Deller15ad7cd2006-12-06 20:40:36 -080027 const struct seq_operations *op;
Kay Sieversf1514632011-07-12 20:48:39 +020028 int poll_event;
Eric W. Biedermanadb37c42012-05-23 18:01:20 -060029#ifdef CONFIG_USER_NS
30 struct user_namespace *user_ns;
31#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 void *private;
33};
34
35struct seq_operations {
36 void * (*start) (struct seq_file *m, loff_t *pos);
37 void (*stop) (struct seq_file *m, void *v);
38 void * (*next) (struct seq_file *m, void *v, loff_t *pos);
39 int (*show) (struct seq_file *m, void *v);
40};
41
Al Viro521b5d02008-03-28 00:46:41 -040042#define SEQ_SKIP 1
43
Miklos Szeredif8439802009-09-21 14:48:36 +020044/**
45 * seq_get_buf - get buffer to write arbitrary data to
46 * @m: the seq_file handle
47 * @bufp: the beginning of the buffer is stored here
48 *
49 * Return the number of bytes available in the buffer, or zero if
50 * there's no space.
51 */
52static inline size_t seq_get_buf(struct seq_file *m, char **bufp)
53{
54 BUG_ON(m->count > m->size);
55 if (m->count < m->size)
56 *bufp = m->buf + m->count;
57 else
58 *bufp = NULL;
59
60 return m->size - m->count;
61}
62
63/**
64 * seq_commit - commit data to the buffer
65 * @m: the seq_file handle
66 * @num: the number of bytes to commit
67 *
68 * Commit @num bytes of data written to a buffer previously acquired
69 * by seq_buf_get. To signal an error condition, or that the data
70 * didn't fit in the available space, pass a negative @num value.
71 */
72static inline void seq_commit(struct seq_file *m, int num)
73{
74 if (num < 0) {
75 m->count = m->size;
76 } else {
77 BUG_ON(m->count + num > m->size);
78 m->count += num;
79 }
80}
81
Al Viro8c9379e2011-12-08 20:18:57 -050082char *mangle_path(char *s, const char *p, const char *esc);
Helge Deller15ad7cd2006-12-06 20:40:36 -080083int seq_open(struct file *, const struct seq_operations *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
85loff_t seq_lseek(struct file *, loff_t, int);
86int seq_release(struct inode *, struct file *);
87int seq_escape(struct seq_file *, const char *, const char *);
88int seq_putc(struct seq_file *m, char c);
89int seq_puts(struct seq_file *m, const char *s);
Peter Oberparleiter0b923602009-06-17 16:28:05 -070090int seq_write(struct seq_file *seq, const void *data, size_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Joe Perchesb9075fa2011-10-31 17:11:33 -070092__printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
Steven Whitehousea4808142012-06-11 13:16:35 +010093__printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Al Viro8c9379e2011-12-08 20:18:57 -050095int seq_path(struct seq_file *, const struct path *, const char *);
96int seq_dentry(struct seq_file *, struct dentry *, const char *);
97int seq_path_root(struct seq_file *m, const struct path *path,
98 const struct path *root, const char *esc);
Rusty Russellcb78a0c2008-12-30 09:05:14 +103099int seq_bitmap(struct seq_file *m, const unsigned long *bits,
100 unsigned int nr_bits);
101static inline int seq_cpumask(struct seq_file *m, const struct cpumask *mask)
Alexey Dobriyan50ac2d62008-08-12 15:09:02 -0700102{
Rusty Russellaf76aba2009-03-30 22:05:11 -0600103 return seq_bitmap(m, cpumask_bits(mask), nr_cpu_ids);
Alexey Dobriyan50ac2d62008-08-12 15:09:02 -0700104}
105
106static inline int seq_nodemask(struct seq_file *m, nodemask_t *mask)
107{
108 return seq_bitmap(m, mask->bits, MAX_NUMNODES);
109}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Rusty Russellaf76aba2009-03-30 22:05:11 -0600111int seq_bitmap_list(struct seq_file *m, const unsigned long *bits,
Lai Jiangshan3eda2012008-10-18 20:28:19 -0700112 unsigned int nr_bits);
113
Rusty Russellaf76aba2009-03-30 22:05:11 -0600114static inline int seq_cpumask_list(struct seq_file *m,
115 const struct cpumask *mask)
Lai Jiangshan3eda2012008-10-18 20:28:19 -0700116{
Rusty Russellaf76aba2009-03-30 22:05:11 -0600117 return seq_bitmap_list(m, cpumask_bits(mask), nr_cpu_ids);
Lai Jiangshan3eda2012008-10-18 20:28:19 -0700118}
119
120static inline int seq_nodemask_list(struct seq_file *m, nodemask_t *mask)
121{
122 return seq_bitmap_list(m, mask->bits, MAX_NUMNODES);
123}
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
Al Viro2043f492013-03-31 13:43:23 -0400126int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127int single_release(struct inode *, struct file *);
Pavel Emelyanov39699032007-10-10 02:28:42 -0700128void *__seq_open_private(struct file *, const struct seq_operations *, int);
129int seq_open_private(struct file *, const struct seq_operations *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130int seq_release_private(struct inode *, struct file *);
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700131int seq_put_decimal_ull(struct seq_file *m, char delimiter,
132 unsigned long long num);
KAMEZAWA Hiroyukibda7bad2012-03-23 15:02:54 -0700133int seq_put_decimal_ll(struct seq_file *m, char delimiter,
134 long long num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Eric W. Biedermanadb37c42012-05-23 18:01:20 -0600136static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
137{
138#ifdef CONFIG_USER_NS
139 return seq->user_ns;
140#else
141 extern struct user_namespace init_user_ns;
142 return &init_user_ns;
143#endif
144}
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#define SEQ_START_TOKEN ((void *)1)
Pavel Emelianovbcf67e12007-07-10 17:22:26 -0700147/*
148 * Helpers for iteration over list_head-s in seq_files
149 */
150
151extern struct list_head *seq_list_start(struct list_head *head,
152 loff_t pos);
153extern struct list_head *seq_list_start_head(struct list_head *head,
154 loff_t pos);
155extern struct list_head *seq_list_next(void *v, struct list_head *head,
156 loff_t *ppos);
157
Li Zefan66655de2010-02-08 23:18:22 +0000158/*
159 * Helpers for iteration over hlist_head-s in seq_files
160 */
161
162extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
stephen hemminger1cc52322010-02-22 07:57:17 +0000163 loff_t pos);
Li Zefan66655de2010-02-08 23:18:22 +0000164extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
stephen hemminger1cc52322010-02-22 07:57:17 +0000165 loff_t pos);
Li Zefan66655de2010-02-08 23:18:22 +0000166extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
stephen hemminger1cc52322010-02-22 07:57:17 +0000167 loff_t *ppos);
Li Zefan66655de2010-02-08 23:18:22 +0000168
stephen hemminger1cc52322010-02-22 07:57:17 +0000169extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
170 loff_t pos);
171extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
172 loff_t pos);
173extern struct hlist_node *seq_hlist_next_rcu(void *v,
174 struct hlist_head *head,
175 loff_t *ppos);
Jeff Layton0bc77382013-06-21 08:58:21 -0400176
177/* Helpers for iterating over per-cpu hlist_head-s in seq_files */
178extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos);
179
180extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182#endif