From 3aef3cae4342c1d8137a1c0782cbb66f1be3943c Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 09:14:01 -0700 Subject: [PATCH] block: add a req_bvec helper Return the currently active bvec segment, potentially spanning multiple pages. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- include/linux/blkdev.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 5c58a3b..84ce76f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -932,6 +932,17 @@ static inline unsigned int blk_rq_payload_bytes(struct request *rq) return blk_rq_bytes(rq); } +/* + * Return the first full biovec in the request. The caller needs to check that + * there are any bvecs before calling this helper. + */ +static inline struct bio_vec req_bvec(struct request *rq) +{ + if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) + return rq->special_vec; + return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); +} + static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, int op) { -- 2.7.4