PURGE_CHILDREN
cache_purge1(vp, NULL, 0, PURGE_CHILDREN);
if (flags & PURGE_CHILDREN) {
cache_purge1(dvp, NULL, 0, PURGE_CHILDREN);
#define cache_purge(vp) cache_purge1((vp),NULL,0,PURGE_PARENTS|PURGE_CHILDREN)