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block: add dma_map_bvec helper

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Provide a nice little shortcut for mapping a single bvec.

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 08:40:36 -07:00
parent 9d9de535f3
commit 3ab3a0313c
1 changed files with 4 additions and 0 deletions
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4
include/linux/blkdev.h
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@ -644,6 +644,10 @@ static inline bool blk_account_rq(struct request *rq)
#define rq_dma_dir(rq) \
(op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
#define dma_map_bvec(dev, bv, dir, attrs) \
dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
(dir), (attrs))
static inline bool queue_is_mq(struct request_queue *q)
{
return q->mq_ops;