getvnodemount
if (!kvm_read_all(kd, (unsigned long)getvnodemount(vp), &mount,
(void *)getvnodemount(vp));
struct mount *getvnodemount(struct vnode *vp);
error = kvm_read_all(kd, (unsigned long)getvnodemount(vp), &mnt,
(void *)getvnodemount(vp), vp);
mountptr = getvnodemount(vp);