dq_ftimelimit
dqp->dq_ftimelimit = 0;
dqp->dq_ftimelimit == 0) {
dqp->dq_ftimelimit = now + ufsvfsp->vfs_ftimelimit;
} else if (now > dqp->dq_ftimelimit && !force) {
(dqp->dq_ftimelimit? dqp->dq_ftimelimit: DQ_FTIMELIMIT);
newlim.dqb_ftimelimit = dqp->dq_ftimelimit;