should_fail_request
if (should_fail_request(bdev_whole(bio->bi_bdev), bio->bi_iter.bi_size))
if (unlikely(should_fail_request(p, bio->bi_iter.bi_size)))
if (q->disk && should_fail_request(q->disk->part0, blk_rq_bytes(rq)))
bool should_fail_request(struct block_device *part, unsigned int bytes);