linux-kernel - [PATCH 27/27] mm: page_io.c: use bio_get_base

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Date:	Tue,  5 Apr 2016 20:07:42 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	Ming Lei <tom.leiming@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dongsu Park <dpark@...teo.net>,
	Minchan Kim <minchan@...nel.org>, Tejun Heo <tj@...nel.org>,
	Joe Perches <joe@...ches.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Omar Sandoval <osandov@...ndov.com>,
	linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
Subject: [PATCH 27/27] mm: page_io.c: use bio_get_base_vec()

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 mm/page_io.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index 18aac78..b5a6baf 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -43,7 +43,14 @@ static struct bio *get_swap_bio(gfp_t gfp_flags,
 
 void end_swap_bio_write(struct bio *bio)
 {
-	struct page *page = bio->bi_io_vec[0].bv_page;
+	/*
+	 * Single bvec bio.
+	 *
+	 * For accessing page pointed to by the 1st bvec, it
+	 * works too after multipage bvecs.
+	 */
+	struct bio_vec *bvec = bio_get_base_vec(bio);
+	struct page *page = bvec->bv_page;
 
 	if (bio->bi_error) {
 		SetPageError(page);
@@ -116,7 +123,14 @@ static void swap_slot_free_notify(struct page *page)
 
 static void end_swap_bio_read(struct bio *bio)
 {
-	struct page *page = bio->bi_io_vec[0].bv_page;
+	/*
+	 * Single bvec bio.
+	 *
+	 * For accessing page pointed to by the 1st bvec, it
+	 * works too after multipage bvecs.
+	 */
+	struct bio_vec *bvec = bio_get_base_vec(bio);
+	struct page *page = bvec->bv_page;
 
 	if (bio->bi_error) {
 		SetPageError(page);
-- 
1.9.1