vn_vfsrlock_wait
if (error = vn_vfsrlock_wait(dvp))
if (error = vn_vfsrlock_wait(vp))
if (error = vn_vfsrlock_wait(vp)) {
if (error = vn_vfsrlock_wait(vp))
error = vn_vfsrlock_wait(dvp);
error = vn_vfsrlock_wait(realdvp);
error = vn_vfsrlock_wait(cvp);
error = vn_vfsrlock_wait(vp);
int vn_vfsrlock_wait(struct vnode *vp);