VOP_LOCK
VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
VOP_LOCK(vp, LK_EXCLUSIVE);
VOP_LOCK(vp, LK_EXCLUSIVE | LK_DRAIN);
error = VOP_LOCK(vp, flags);
return VOP_LOCK(vp, ap->a_flags);
VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
VOP_LOCK(vp, LK_EXCLUSIVE);
int VOP_LOCK(struct vnode *, int);
VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);