linux-kernel - [RFC PATCH 06/28] block: Support dma-direct bios in bio_advance

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Date:   Thu, 20 Jun 2019 10:12:18 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [RFC PATCH 06/28] block: Support dma-direct bios in bio_advance_iter()

Dma-direct bio iterators need to be advanced using a similar
dvec_iter_advance helper.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 include/linux/bio.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 8180309123d7..e212e5958a75 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -134,6 +134,8 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
 
 	if (bio_no_advance_iter(bio))
 		iter->bi_size -= bytes;
+	else if (op_is_dma_direct(bio->bi_opf))
+		dvec_iter_advance(bio->bi_dma_vec, iter, bytes);
 	else
 		bvec_iter_advance(bio->bi_io_vec, iter, bytes);
 		/* TODO: It is reasonable to complete bio with error here. */
-- 
2.20.1