mnt_set_expiry(): use guards

The reason why it needs only mount_locked_reader is that there's no lockless
accesses of expiry lists.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namespace.c b/fs/namespace.c
index 2cb3cb8307ca047271acc044762354efdaa7163e..db25c81d7f68f42ce11d5f25911b557663ceb1ea 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3858,9 +3858,8 @@ discard:
  */
 void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list)
 {
-       read_seqlock_excl(&mount_lock);
+       guard(mount_locked_reader)();
        list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list);
-       read_sequnlock_excl(&mount_lock);
 }
 EXPORT_SYMBOL(mnt_set_expiry);