fsnotify: Create function to remove event from notification list

Create function to remove event from the notification list. Later it will
be used from more places.
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/notify/notification.c

@@ -141,6 +141,18 @@ int fsnotify_add_event(struct fsnotify_group *group,
 	return ret;
 }
 
+void fsnotify_remove_queued_event(struct fsnotify_group *group,
+				  struct fsnotify_event *event)
+{
+	assert_spin_locked(&group->notification_lock);
+	/*
+	 * We need to init list head for the case of overflow event so that
+	 * check in fsnotify_add_event() works
+	 */
+	list_del_init(&event->list);
+	group->q_len--;
+}
+
 /*
  * Remove and return the first event from the notification list.  It is the
  * responsibility of the caller to destroy the obtained event
@@ -155,13 +167,7 @@ struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group)
 
 	event = list_first_entry(&group->notification_list,
 				 struct fsnotify_event, list);
-	/*
-	 * We need to init list head for the case of overflow event so that
-	 * check in fsnotify_add_event() works
-	 */
-	list_del_init(&event->list);
-	group->q_len--;
-
+	fsnotify_remove_queued_event(group, event);
 	return event;
 }
 

include/linux/fsnotify_backend.h

@@ -422,6 +422,9 @@ extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
 extern struct fsnotify_event *fsnotify_peek_first_event(struct fsnotify_group *group);
 /* return AND dequeue the first event on the notification queue */
 extern struct fsnotify_event *fsnotify_remove_first_event(struct fsnotify_group *group);
+/* Remove event queued in the notification list */
+extern void fsnotify_remove_queued_event(struct fsnotify_group *group,
+					 struct fsnotify_event *event);
 
 /* functions used to manipulate the marks attached to inodes */