CEPH_I_ERROR_WRITE_BIT
test_bit(CEPH_I_ERROR_WRITE_BIT, &ci->i_ceph_flags)) {
set_bit(CEPH_I_ERROR_WRITE_BIT, &ci->i_ceph_flags);
clear_bit(CEPH_I_ERROR_WRITE_BIT, &ci->i_ceph_flags);