/*
   * tracepoint-probe-sample2.c
   *
   * 2nd sample tracepoint probes.
   */
  
  #include <linux/module.h>
  #include <linux/fs.h>
  #include "tp-samples-trace.h"
  
  /*
   * Here the caller only guarantees locking for struct file and struct inode.
   * Locking must therefore be done in the probe to use the dentry.
   */

  static void probe_subsys_event(void *ignore,
  			       struct inode *inode, struct file *file)

  {
  	printk(KERN_INFO "Event is encountered with inode number %lu
  ",
  		inode->i_ino);
  }

  static int __init tp_sample_trace_init(void)

  {
  	int ret;

  	ret = register_trace_subsys_event(probe_subsys_event, NULL);

  	WARN_ON(ret);
  
  	return 0;
  }
  
  module_init(tp_sample_trace_init);

  static void __exit tp_sample_trace_exit(void)

  {

  	unregister_trace_subsys_event(probe_subsys_event, NULL);

  	tracepoint_synchronize_unregister();

  }
  
  module_exit(tp_sample_trace_exit);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Mathieu Desnoyers");
  MODULE_DESCRIPTION("Tracepoint Probes Samples");