struct ucred *ubc_getcred(struct vnode *);
int ubc_setcred(struct vnode *, struct proc *);
+struct thread;
+int ubc_setthreadcred(struct vnode *, struct proc *, struct thread *);
int ubc_sync_range(vnode_t, off_t, off_t, int);
errno_t ubc_msync(vnode_t, off_t, off_t, off_t *, int);