softdep_prerename_vnode
error = softdep_prerename_vnode(ump, fdvp);
error = softdep_prerename_vnode(ump, fvp);
error = softdep_prerename_vnode(ump, tdvp);
error = softdep_prerename_vnode(ump, tvp);
static int softdep_prerename_vnode(struct ufsmount *, struct vnode *);