fsnotify: generic notification queue and waitq
inotify needs to do asyc notification in which event information is stored
on a queue until the listener is ready to receive it. This patch
implements a generic notification queue for inotify (and later fanotify) to
store events to be sent at a later time.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
diff --git a/fs/notify/group.c b/fs/notify/group.c
index a29d2fa..0e16771 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -91,6 +91,9 @@
*/
void fsnotify_final_destroy_group(struct fsnotify_group *group)
{
+ /* clear the notification queue of all events */
+ fsnotify_flush_notify(group);
+
if (group->ops->free_group_priv)
group->ops->free_group_priv(group);
@@ -214,6 +217,12 @@
group->group_num = group_num;
group->mask = mask;
+ mutex_init(&group->notification_mutex);
+ INIT_LIST_HEAD(&group->notification_list);
+ init_waitqueue_head(&group->notification_waitq);
+ group->q_len = 0;
+ group->max_events = UINT_MAX;
+
spin_lock_init(&group->mark_lock);
atomic_set(&group->num_marks, 0);
INIT_LIST_HEAD(&group->mark_entries);