v_fifoinfo
if ((fip = vp->v_fifoinfo) == NULL) {
vp->v_fifoinfo = fip;
rso = ap->a_vp->v_fifoinfo->fi_readsock;
ap->a_vp->v_fifoinfo->fi_writers == 0)
wso = ap->a_vp->v_fifoinfo->fi_writesock;
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
fip = vp->v_fifoinfo;
vp->v_fifoinfo = NULL;
fip = vp->v_fifoinfo;
so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock;
so = (struct socket *)ap->a_vp->v_fifoinfo->fi_writesock;