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 }; 18 19 static inline void 20 trace_seq_init(struct trace_seq *s) 21 { 22 s->len = 0; 23 s->readpos = 0; 24 } 25 26 /* 27 * Currently only defined when tracing is enabled. 28 */ 29 #ifdef CONFIG_TRACING 30 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 31 __attribute__ ((format (printf, 2, 3))); 32 extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args) 33 __attribute__ ((format (printf, 2, 0))); 34 extern int 35 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary); 36 extern int trace_print_seq(struct seq_file *m, struct trace_seq *s); 37 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 38 size_t cnt); 39 extern int trace_seq_puts(struct trace_seq *s, const char *str); 40 extern int trace_seq_putc(struct trace_seq *s, unsigned char c); 41 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len); 42 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 43 size_t len); 44 extern void *trace_seq_reserve(struct trace_seq *s, size_t len); 45 extern int trace_seq_path(struct trace_seq *s, struct path *path); 46 47 #else /* CONFIG_TRACING */ 48 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 49 { 50 return 0; 51 } 52 static inline int 53 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 54 { 55 return 0; 56 } 57 58 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) 59 { 60 return 0; 61 } 62 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 63 size_t cnt) 64 { 65 return 0; 66 } 67 static inline int trace_seq_puts(struct trace_seq *s, const char *str) 68 { 69 return 0; 70 } 71 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c) 72 { 73 return 0; 74 } 75 static inline int 76 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) 77 { 78 return 0; 79 } 80 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 81 size_t len) 82 { 83 return 0; 84 } 85 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len) 86 { 87 return NULL; 88 } 89 static inline int trace_seq_path(struct trace_seq *s, struct path *path) 90 { 91 return 0; 92 } 93 #endif /* CONFIG_TRACING */ 94 95 #endif /* _LINUX_TRACE_SEQ_H */ 96