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block: add a req_bvec helper 

Return the currently active bvec segment, potentially spanning multiple
pages.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
This commit is contained in:
Christoph Hellwig 2019-03-03 09:14:01 -07:00
parent 39f8e36401
commit 3aef3cae43
1 changed files with 11 additions and 0 deletions
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11
include/linux/blkdev.h
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@ -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)
{