On Thu, Sep 09, 2021 at 10:12:51PM +0800, Yu Kuai wrote: > While handling a response message from server, nbd_read_stat() will > try to get request by tag, and then complete the request. However, > this is problematic if nbd haven't sent a corresponding request > message: > > t1 t2 > submit_bio > nbd_queue_rq > blk_mq_start_request > recv_work > nbd_read_stat > blk_mq_tag_to_rq > blk_mq_complete_request > nbd_send_cmd > > Thus add a new cmd flag 'NBD_CMD_INFLIGHT', it will be set in > nbd_send_cmd() and checked in nbd_read_stat(). > > Noted that this patch can't fix that blk_mq_tag_to_rq() might > return a freed request, and this will be fixed in following > patches. > > Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx> Looks fine: Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx> -- Ming
