R5_Wantfill
if (test_and_clear_bit(R5_Wantfill, &dev->flags)) {
if (test_bit(R5_Wantfill, &dev->flags)) {
if (!test_bit(R5_Wantfill, &sh->dev[i].flags) &&
set_bit(R5_Wantfill, &dev->flags);
if (test_bit(R5_Wantfill, &dev->flags))