Split adding binary attributes into a separate handler instead of
overloading sysfs_add_file_mode_ns.
Acked-by: NChristian Brauner <christian.brauner@ubuntu.com>
Acked-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210913054121.616001-5-hch@lst.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>