IREQ_PENDING_ABORT
!test_bit(IREQ_PENDING_ABORT, &ireq->flags) &&
(check_abort && !test_bit(IREQ_PENDING_ABORT, &ireq->flags)))
set_bit(IREQ_PENDING_ABORT, &ireq->flags);
clear_bit(IREQ_PENDING_ABORT, &ireq->flags);