1 /* 2 * tracepoint-probe-sample2.c 3 * 4 * 2nd sample tracepoint probes. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/fs.h> 9 #include "tp-samples-trace.h" 10 11 /* 12 * Here the caller only guarantees locking for struct file and struct inode. 13 * Locking must therefore be done in the probe to use the dentry. 14 */ probe_subsys_event(struct inode * inode,struct file * file)15static void probe_subsys_event(struct inode *inode, struct file *file) 16 { 17 printk(KERN_INFO "Event is encountered with inode number %lu\n", 18 inode->i_ino); 19 } 20 tp_sample_trace_init(void)21static int __init tp_sample_trace_init(void) 22 { 23 int ret; 24 25 ret = register_trace_subsys_event(probe_subsys_event); 26 WARN_ON(ret); 27 28 return 0; 29 } 30 31 module_init(tp_sample_trace_init); 32 tp_sample_trace_exit(void)33static void __exit tp_sample_trace_exit(void) 34 { 35 unregister_trace_subsys_event(probe_subsys_event); 36 tracepoint_synchronize_unregister(); 37 } 38 39 module_exit(tp_sample_trace_exit); 40 41 MODULE_LICENSE("GPL"); 42 MODULE_AUTHOR("Mathieu Desnoyers"); 43 MODULE_DESCRIPTION("Tracepoint Probes Samples"); 44