From: Christoph Hellwig <hch@lst.de> Date: 2016-06-14 17:15:57
These days we have a lot more users of struct request for driver internal
use than just REQ_TYPE_BLOCK_PC, so let's polish this infrastructure
up a bit.
Changes since V1:
- keep blk_rq_set_block_pc for now and leave zeroing ->cmd in it