lru_iter_first
static vnode_impl_t * lru_iter_first(int, lru_iter_t *);
for (vip = lru_iter_first(LRU_VRELE, &iter); vip != NULL;
for (vip = lru_iter_first(lists[ix], &iter); vip != NULL;
while ((vip = lru_iter_first(LRU_VRELE, &iter)) != NULL) {