sfind
if ((csp = sfind(dev, type, NULL)) != NULL) {
if ((sp = sfind(dev, type, vp)) == NULL) {
if ((sp = sfind(dev, type, NULL)) == NULL) {
if ((sp = sfind(dev, type, NULL)) == NULL) {
static struct snode *sfind(dev_t, vtype_t, struct vnode *);