On Thu, May 25, 2017 at 11:43:16AM -0700, Bart Van Assche wrote: > Several block drivers need to initialize the driver-private data > after having called blk_get_request() and before .prep_rq_fn() is > called, e.g. when submitting a REQ_OP_SCSI_* request. Avoid that > that initialization code has to be repeated after every > blk_get_request() call by adding a new callback function to struct > request_queue.
I still think we should do this at the end of blk_mq_alloc_request / blk_old_get_request to exactly keep the old semantics and keep the calls out of the hot path.
