[PATCH v3 14/65] mnt_set_expiry(): use guards

[Al Viro <viro@zeniv.linux.org.uk>]

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>
---
 fs/namespace.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 2cb3cb8307ca..db25c81d7f68 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3858,9 +3858,8 @@ int finish_automount(struct vfsmount *m, const struct path *path)
  */
 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);
 
-- 
2.47.2