fsnotify: Remove special handling of mark destruction on group shutdown

Currently we queue all marks for destruction on group shutdown and then
destroy them from fsnotify_destroy_group() instead from a worker thread
which is the usual path. However worker can already be processing some
list of marks to destroy so this does not make 100% all marks are really
destroyed by the time group is shut down. This isn't a big problem as
each mark holds group reference and thus group stays partially alive
until all marks are really freed but there's no point in complicating
our lives - just wait for the delayed work to be finished instead.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/notify/group.c b/fs/notify/group.c
index fbe3cbe..0fb4aad 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -66,14 +66,16 @@ void fsnotify_destroy_group(struct fsnotify_group *group)
 	 */
 	fsnotify_group_stop_queueing(group);
 
-	/* clear all inode marks for this group, attach them to destroy_list */
+	/* Clear all marks for this group and queue them for destruction */
 	fsnotify_detach_group_marks(group);
 
 	/*
-	 * Wait for fsnotify_mark_srcu period to end and free all marks in
-	 * destroy_list
+	 * Wait until all marks get really destroyed. We could actually destroy
+	 * them ourselves instead of waiting for worker to do it, however that
+	 * would be racy as worker can already be processing some marks before
+	 * we even entered fsnotify_destroy_group().
 	 */
-	fsnotify_mark_destroy_list();
+	fsnotify_wait_marks_destroyed();
 
 	/*
 	 * Since we have waited for fsnotify_mark_srcu in