pfs_vncache_alloc
return (pfs_vncache_alloc(mp, vpp, pi->pi_root, NO_PID));
int pfs_vncache_alloc (struct mount *, struct vnode **,
error = pfs_vncache_alloc(mp, dvp, pn, pid);
error = pfs_vncache_alloc(mp, vpp, pn, pid);