1 #ifndef _LINUX_TRACE_SEQ_H
2 #define _LINUX_TRACE_SEQ_H
3
4 #include <linux/fs.h>
5
6 #include <asm/page.h>
7
8 /*
9 * Trace sequences are used to allow a function to call several other functions
10 * to create a string of data to use (up to a max of PAGE_SIZE).
11 */
12
13 struct trace_seq {
14 unsigned char buffer[PAGE_SIZE];
15 unsigned int len;
16 unsigned int readpos;
17 int full;
18 };
19
20 static inline void
trace_seq_init(struct trace_seq * s)21 trace_seq_init(struct trace_seq *s)
22 {
23 s->len = 0;
24 s->readpos = 0;
25 s->full = 0;
26 }
27
28 /*
29 * Currently only defined when tracing is enabled.
30 */
31 #ifdef CONFIG_TRACING
32 extern __printf(2, 3)
33 int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
34 extern __printf(2, 0)
35 int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
36 extern int
37 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
38 extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
39 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
40 size_t cnt);
41 extern int trace_seq_puts(struct trace_seq *s, const char *str);
42 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
43 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
44 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
45 size_t len);
46 extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
47 extern int trace_seq_path(struct trace_seq *s, const struct path *path);
48
49 #else /* CONFIG_TRACING */
trace_seq_printf(struct trace_seq * s,const char * fmt,...)50 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
51 {
52 return 0;
53 }
54 static inline int
trace_seq_bprintf(struct trace_seq * s,const char * fmt,const u32 * binary)55 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
56 {
57 return 0;
58 }
59
trace_print_seq(struct seq_file * m,struct trace_seq * s)60 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
61 {
62 return 0;
63 }
trace_seq_to_user(struct trace_seq * s,char __user * ubuf,size_t cnt)64 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
65 size_t cnt)
66 {
67 return 0;
68 }
trace_seq_puts(struct trace_seq * s,const char * str)69 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
70 {
71 return 0;
72 }
trace_seq_putc(struct trace_seq * s,unsigned char c)73 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
74 {
75 return 0;
76 }
77 static inline int
trace_seq_putmem(struct trace_seq * s,const void * mem,size_t len)78 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
79 {
80 return 0;
81 }
trace_seq_putmem_hex(struct trace_seq * s,const void * mem,size_t len)82 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
83 size_t len)
84 {
85 return 0;
86 }
trace_seq_reserve(struct trace_seq * s,size_t len)87 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
88 {
89 return NULL;
90 }
trace_seq_path(struct trace_seq * s,const struct path * path)91 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
92 {
93 return 0;
94 }
95 #endif /* CONFIG_TRACING */
96
97 #endif /* _LINUX_TRACE_SEQ_H */
98