R5_WriteError
set_bit(R5_WriteError, &sh->dev[i].flags);
if (test_bit(R5_WriteError, &dev->flags)) {
clear_bit(R5_WriteError, &dev->flags);
(~((1 << R5_WriteError) | (1 << R5_Overlap)));
if (test_and_clear_bit(R5_WriteError, &dev->flags)) {