ffs_mountfs
int ffs_mountfs(struct vnode *, struct mount *, struct lwp *);
if ((error = ffs_mountfs(rootvp, mp, l)) != 0) {
error = ffs_mountfs(devvp, mp, l);
if ((error = ffs_mountfs(rootvp, mp, l)) != 0) {
if ((error = ffs_mountfs(devvp, mp, l)) != 0) {