md/raid10: make sync_request_write() call bio_copy_data()

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
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
[dpark: add more description in commit message]
Signed-off-by: Dongsu Park <dpark@posteo.net>
Signed-off-by: Ming Lin <mlin@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 4 insertions, 14 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index f55c3f35b746..03f460a1de60 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2099,17 +2099,10 @@ 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);
@@ -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,