UDF_SHED_WAITING
eccline = udf_peek_eccline(priv, UDF_SHED_WAITING);
eccline = udf_pop_eccline(priv, UDF_SHED_WAITING);
work = (bufq_peek(priv->queues[UDF_SHED_WAITING]) != NULL);
KASSERT(bufq_peek(priv->queues[UDF_SHED_WAITING]) == NULL);
KASSERT(priv->num_queued[UDF_SHED_WAITING] == 0);
bufq_alloc(&priv->queues[UDF_SHED_WAITING], "fcfs",
new_queue = UDF_SHED_WAITING;