[md PATCH 06/10] md: teach sync_page_io about new_data_offset.

[NeilBrown <neilb@xxxxxxx>]

Some code in raid1 and raid10 use sync_page_io to
read/write pages when responding to read errors.
As we will shortly support changing data_offset for
raid10, this function must understand new_data_offset.

So add that understanding.

Signed-off-by: NeilBrown <neilb@xxxxxxx>
---

 drivers/md/md.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0db613d..8da63d1 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -886,6 +886,10 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 		rdev->meta_bdev : rdev->bdev;
 	if (metadata_op)
 		bio->bi_sector = sector + rdev->sb_start;
+	else if (rdev->mddev->reshape_position != MaxSector &&
+		 (rdev->mddev->reshape_backwards ==
+		  (sector >= rdev->mddev->reshape_position)))
+		bio->bi_sector = sector + rdev->new_data_offset;
 	else
 		bio->bi_sector = sector + rdev->data_offset;
 	bio_add_page(bio, page, size, 0);


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