drbd: account bitmap IO during resync as resync-(related-)-io

If we have a good resync rate, we will frequently update the on-disk
bitmap, which, if not accounted for as resync io, may let an otherwise
idle device appear to be "busy", and cause us to throttle resync.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 61f4fae..7b97629 100644 (file)
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -991,6 +991,9 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
                bio_endio(bio, -EIO);
        } else {
                submit_bio(rw, bio);
+               /* this should not count as user activity and cause the
+                * resync to throttle -- see drbd_rs_should_slow_down(). */
+               atomic_add(len >> 9, &mdev->rs_sect_ev);
        }
 }