md: teach sync_page_io about new_data_offset.

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@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9fa98fc..c6b8d9f 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -888,6 +888,10 @@ 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);