R5_Wantdrain
set_bit(R5_Wantdrain, &dev->flags);
(test_bit(R5_Wantdrain, &dev->flags) ||
} else if (test_bit(R5_Wantdrain, &dev->flags)) {
if (test_and_clear_bit(R5_Wantdrain, &head_sh->dev[i].flags)) {
set_bit(R5_Wantdrain, &dev->flags);
set_bit(R5_Wantdrain, &dev->flags);