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 */
15static void probe_subsys_event(void *ignore,
16			       struct inode *inode, struct file *file)
17{
18	printk(KERN_INFO "Event is encountered with inode number %lu\n",
19		inode->i_ino);
20}
21
22static int __init tp_sample_trace_init(void)
23{
24	int ret;
25
26	ret = register_trace_subsys_event(probe_subsys_event, NULL);
27	WARN_ON(ret);
28
29	return 0;
30}
31
32module_init(tp_sample_trace_init);
33
34static void __exit tp_sample_trace_exit(void)
35{
36	unregister_trace_subsys_event(probe_subsys_event, NULL);
37	tracepoint_synchronize_unregister();
38}
39
40module_exit(tp_sample_trace_exit);
41
42MODULE_LICENSE("GPL");
43MODULE_AUTHOR("Mathieu Desnoyers");
44MODULE_DESCRIPTION("Tracepoint Probes Samples");