smb_co_lockstatus
if (smb_co_lockstatus(cp, curthread) == LK_EXCLUSIVE &&
KASSERT(smb_co_lockstatus(parent, curthread) == LK_EXCLUSIVE, ("smb_co_addchild: parent not locked"));
KASSERT(smb_co_lockstatus(child, curthread) == LK_EXCLUSIVE, ("smb_co_addchild: child not locked"));
static int smb_co_lockstatus(struct smb_connobj *cp, struct thread *td);