vds_operation
static const vds_operation_t vds_operation[] = {
(sizeof (vds_operation))/(sizeof (vds_operation[0]));
if (request->operation == vds_operation[i].operation) {
ASSERT(vds_operation[i].start != NULL);
task->completef = vds_operation[i].complete;
return (vds_operation[i].start(task));