Based on the value of "dio->iocb->ki_ioprio" and "dio->iocb->ki_flags", we can update OEM-specific field of struct bio through this hook. then we can distinguish different IO's in lower level drivers and take different measures Bug: 262939423 Change-Id: Ie84d737ca72c29737542f3783d27d7231a272cc4 Signed-off-by: lijiaming <lijiaming3@xiaomi.com>