linux-kernel - [RFC PATCH 09/16] bvec: introduce bvec_page and bvec_set

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Date:   Wed, 24 May 2017 15:42:20 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-nvme@...ts.infradead.org,
        linux-rdma@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Jens Axboe <axboe@...nel.dk>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ming Lei <ming.lei@...onical.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Stephen Bates <sbates@...thlin.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Christian König <christian.koenig@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Jerome Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [RFC PATCH 09/16] bvec: introduce bvec_page and bvec_set_page accessors

Introduce two accessor functions for bv_page: bvec_page to return the
page and bvec_set_page. A follow on patch will mechanically convert all the
individual uses within the kernel.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Stephen Bates <sbates@...thlin.com>
---
 include/linux/bvec.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 89b65b8..b5369a0 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -43,6 +43,16 @@ struct bvec_iter {
 						   current bvec */
 };
 
+static inline struct page *bvec_page(const struct bio_vec *bvec)
+{
+	return bvec->bv_page;
+}
+
+static inline void bvec_set_page(struct bio_vec *bvec, struct page *page)
+{
+	bvec->bv_page = page;
+}
+
 /*
  * various member access, note that bio_data should of course not be used
  * on highmem page vectors
-- 
2.1.4