R1BIO_FailFast
test_bit(R1BIO_FailFast, &r1_bio->state))
test_bit(R1BIO_FailFast, &r1_bio->state)) {
set_bit(R1BIO_FailFast, &r1_bio->state);
clear_bit(R1BIO_FailFast, &r1_bio->state);