Add rate limit to error message, in case resync is aborted due to disk failure

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

drivers/block/drbd/drbd_actlog.c

@@ -1319,7 +1319,8 @@ void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector)
 	bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
 	if (!bm_ext) {
 		spin_unlock_irqrestore(&mdev->al_lock, flags);
-		dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n");
+		if (__ratelimit(&drbd_ratelimit_state))
+			dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n");
 		return;
 	}