lfs_writevnodes
lfs_writevnodes(fs, sp, VN_REG);
lfs_writevnodes(fs, sp, VN_DIROP);
int lfs_writevnodes(struct lfs *, struct segment *, int);
int lfs_writevnodes(struct lfs *fs, struct mount *mp,
lfs_writevnodes(fs, vp->v_mount, sp, VN_EMPTY);
lfs_writevnodes(fs, mp, sp, VN_CLEAN);
um_error = lfs_writevnodes(fs, mp, sp, VN_REG);
error = lfs_writevnodes(fs, mp, sp, VN_DIROP);