blk-mq-sched: decide how to handle flush rq via RQF_FLUSH_SEQ
In case of IO scheduler we always pre-allocate one driver tag before calling blk_insert_flush(), and flush request will be marked as RQF_FLUSH_SEQ once it is in flush machinery. So if RQF_FLUSH_SEQ isn't set, we call blk_insert_flush() to handle the request, otherwise the flush request is dispatched to ->dispatch list directly. This is a preparation patch for not preallocating a driver tag for flush requests, and for not treating flush requests as a special case. This is similar to what the legacy path does. Signed-off-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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