* [PATCH v3 2/4] md/raid10: make sync_request_write() call bio_copy_data()
[not found] <1429830275-6792-1-git-send-email-mlin@kernel.org>
@ 2015-04-23 23:04 ` Ming Lin
2015-04-24 7:08 ` Christoph Hellwig
0 siblings, 1 reply; 2+ messages in thread
From: Ming Lin @ 2015-04-23 23:04 UTC (permalink / raw)
To: linux-kernel
Cc: Christoph Hellwig, Kent Overstreet, Jens Axboe, Dongsu Park,
Neil Brown, linux-raid, Ming Lin
From: Kent Overstreet <kent.overstreet@gmail.com>
Refactor sync_request_write() of md/raid10 to use bio_copy_data()
instead of open coding bio_vec iterations.
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dongsu.park@profitbricks.com>
Signed-off-by: Ming Lin <mlin@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 a7196c4..02e33f1 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2097,18 +2097,11 @@ 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);
@@ -2124,17 +2117,14 @@ 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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