fanotify: Add pids to events

Pass the process identifiers of the triggering processes to fanotify
listeners: this information is useful for event filtering and logging.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index c1c6616..5f633af 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -62,6 +62,7 @@
 	__u32 vers;
 	__s32 fd;
 	__u64 mask;
+	__s64 pid;
 } __attribute__ ((packed));
 
 /* Helper functions to deal with fanotify_event_metadata buffers */