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 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 int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 40 int 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, unsigned int len); 44 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 45 unsigned int len); 46 extern int trace_seq_path(struct trace_seq *s, const struct path *path); 47 48 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 49 int nmaskbits); 50 51 #else /* CONFIG_TRACING */ 52 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 53 { 54 return 0; 55 } 56 static inline int 57 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 58 { 59 return 0; 60 } 61 62 static inline int 63 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 64 int nmaskbits) 65 { 66 return 0; 67 } 68 69 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) 70 { 71 return 0; 72 } 73 static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 74 int cnt) 75 { 76 return 0; 77 } 78 static inline int trace_seq_puts(struct trace_seq *s, const char *str) 79 { 80 return 0; 81 } 82 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c) 83 { 84 return 0; 85 } 86 static inline int 87 trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len) 88 { 89 return 0; 90 } 91 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 92 unsigned int len) 93 { 94 return 0; 95 } 96 static inline int trace_seq_path(struct trace_seq *s, const struct path *path) 97 { 98 return 0; 99 } 100 #endif /* CONFIG_TRACING */ 101 102 #endif /* _LINUX_TRACE_SEQ_H */ 103