[RFC PATCH 12/17] md/raid10: make sync_request_write() call bio_copy_data()

Dongsu Park
2014-12-22T11:50:34Z

From: Kent Overstreet <kmo@daterainc.com>

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

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dongsu.park@profitbricks.com>
Cc: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
---
drivers/md/raid10.c | 20 +++++---------------
1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 32e282f..4a40354 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2107,18 +2107,11 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
tbio->bi_vcnt = vcnt;
tbio->bi_iter.bi_size = r10_bio->sectors << 9;
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;
+ tbio->bi_private = r10_bio;
+
+ bio_copy_data(tbio, fbio);

d = r10_bio->devs[i].devnum;
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
@@ -2134,17 +2127,14 @@ 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,
--
2.1.0