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 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 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 50 int nmaskbits); 51 52 #else /* CONFIG_TRACING */ 53 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 54 { 55 return 0; 56 } 57 static inline int 58 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 59 { 60 return 0; 61 } 62 63 static inline int 64 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 65 int nmaskbits) 66 { 67 return 0; 68 } 69 70 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) 71 { 72 return 0; 73 } 74 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 75 size_t cnt) 76 { 77 return 0; 78 } 79 static inline int trace_seq_puts(struct trace_seq *s, const char *str) 80 { 81 return 0; 82 } 83 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c) 84 { 85 return 0; 86 } 87 static inline int 88 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len) 89 { 90 return 0; 91 } 92 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 93 size_t len) 94 { 95 return 0; 96 } 97 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len) 98 { 99 return NULL; 100 } 101 static inline int trace_seq_path(struct trace_seq *s, const struct path *path) 102 { 103 return 0; 104 } 105 #endif /* CONFIG_TRACING */ 106 107 #endif /* _LINUX_TRACE_SEQ_H */ 108