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 13struct trace_seq { 14 unsigned char buffer[PAGE_SIZE]; 15 unsigned int len; 16 unsigned int readpos; 17 int full; 18}; 19 20static inline void 21trace_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 32extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 33 __attribute__ ((format (printf, 2, 3))); 34extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) 35 __attribute__ ((format (printf, 2, 0))); 36extern int 37trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary); 38extern int trace_print_seq(struct seq_file *m, struct trace_seq *s); 39extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 40 size_t cnt); 41extern int trace_seq_puts(struct trace_seq *s, const char *str); 42extern int trace_seq_putc(struct trace_seq *s, unsigned char c); 43extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len); 44extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 45 size_t len); 46extern void *trace_seq_reserve(struct trace_seq *s, size_t len); 47extern int trace_seq_path(struct trace_seq *s, struct path *path); 48 49#else /* CONFIG_TRACING */ 50static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 51{ 52 return 0; 53} 54static inline int 55trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 56{ 57 return 0; 58} 59 60static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) 61{ 62 return 0; 63} 64static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 65 size_t cnt) 66{ 67 return 0; 68} 69static inline int trace_seq_puts(struct trace_seq *s, const char *str) 70{ 71 return 0; 72} 73static inline int trace_seq_putc(struct trace_seq *s, unsigned char c) 74{ 75 return 0; 76} 77static inline int 78trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) 79{ 80 return 0; 81} 82static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 83 size_t len) 84{ 85 return 0; 86} 87static inline void *trace_seq_reserve(struct trace_seq *s, size_t len) 88{ 89 return NULL; 90} 91static inline int trace_seq_path(struct trace_seq *s, struct path *path) 92{ 93 return 0; 94} 95#endif /* CONFIG_TRACING */ 96 97#endif /* _LINUX_TRACE_SEQ_H */ 98