As mentioned in the reply to Bart, I'd much rather use BLK_MQ_REQ_*
for the sane blk_get_request version (which should have the same
prototype as blk_mq_alloc_request) instead of having another flags
namespace.
REQF_PREEMPT is a bit special because the request is required
to be dispatched to lld even when SCSI device is quiesced.
So this patch introduces __blk_get_request() and allows users to pass
RQF_PREEMPT flag in, then we can allow to allocate request of RQF_PREEMPT
when queue is in mode of PREEMPT
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