linux-kernel - [PATCH 09/10] md/raid10: make sync_request_write() call bio_copy

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Date:	Mon, 27 Apr 2015 23:48:36 -0700
From:	Ming Lin <mlin@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Ming Lin <mlin@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Neil Brown <neilb@...e.de>, linux-raid@...r.kernel.org
Subject: [PATCH 09/10] md/raid10: make sync_request_write() call bio_copy_data()

From: Kent Overstreet <kent.overstreet@...il.com>

Refactor sync_request_write() of md/raid10 to use bio_copy_data()
instead of open coding bio_vec iterations.

Cc: Christoph Hellwig <hch@...radead.org>
Cc: Neil Brown <neilb@...e.de>
Cc: linux-raid@...r.kernel.org
Reviewed-by: Christoph Hellwig <hch@....de>
Acked-by: NeilBrown <neilb@...e.de>
Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dongsu.park@...fitbricks.com>
Signed-off-by: Ming Lin <mlin@...nel.org>
---
 drivers/md/raid10.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index a46c402..6ea6f5f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1989,17 +1989,10 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
 		tbio->bi_rw = WRITE;
 		tbio->bi_private = r10_bio;
 		tbio->bi_iter.bi_sector = r10_bio->devs[i].addr;
-
-		for (j=0; j < vcnt ; j++) {
-			tbio->bi_io_vec[j].bv_offset = 0;
-			tbio->bi_io_vec[j].bv_len = PAGE_SIZE;
-
-			memcpy(page_address(tbio->bi_io_vec[j].bv_page),
-			       page_address(fbio->bi_io_vec[j].bv_page),
-			       PAGE_SIZE);
-		}
 		tbio->bi_end_io = end_sync_write;
 
+		bio_copy_data(tbio, fbio);
+
 		d = r10_bio->devs[i].devnum;
 		atomic_inc(&conf->mirrors[d].rdev->nr_pending);
 		atomic_inc(&r10_bio->remaining);
@@ -2014,17 +2007,14 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
 	 * that are active
 	 */
 	for (i = 0; i < conf->copies; i++) {
-		int j, d;
+		int d;
 
 		tbio = r10_bio->devs[i].repl_bio;
 		if (!tbio || !tbio->bi_end_io)
 			continue;
 		if (r10_bio->devs[i].bio->bi_end_io != end_sync_write
 		    && r10_bio->devs[i].bio != fbio)
-			for (j = 0; j < vcnt; j++)
-				memcpy(page_address(tbio->bi_io_vec[j].bv_page),
-				       page_address(fbio->bi_io_vec[j].bv_page),
-				       PAGE_SIZE);
+			bio_copy_data(tbio, fbio);
 		d = r10_bio->devs[i].devnum;
 		atomic_inc(&r10_bio->remaining);
 		md_sync_acct(conf->mirrors[d].replacement->bdev,
-- 
1.9.1

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