hash = cfs_hash_getref(exp->exp_obd->obd_gen_hash);
cfs_hash_del(hash, &ted->ted_lcd->lcd_generation,
	     &exp->exp_gen_hash);
cfs_hash_putref(hash);

struct cfs_hash *cfs_hash_getref(struct cfs_hash *hs)
{
	if (atomic_inc_not_zero(&hs->hs_refcount))
		return hs;
	return NULL;
}