It's better to use the defined enum stuff not the hardcoded number to
define array.
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220206095241.121485-4-haoxu@linux.alibaba.comSigned-off-by: Jens Axboe <axboe@kernel.dk>