ffs_mountfs
error = ffs_mountfs(devvp, mp, M_MFSNODE);
int ffs_mountfs(struct vnode *, struct mount *, struct malloc_type *);
if( ( error = ffs_mountfs(rootvp, mp, M_FFSNODE)) != 0) {
error = ffs_mountfs(devvp, mp, M_FFSNODE);