On Wed, Feb 24, 2021 at 07:34:10PM +0000, Chuck Lever wrote:
>
>
> > On Feb 24, 2021, at 2:31 PM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> >
> > I confess I always have to stare at these comparisons for a minute to
> > figure out which way they should go. And the logic in each of these
> > loops is a little repetitive.
> >
> > Would it be worth creating a little state_expired() helper to work out
> > the comparison and the new timeout?
>
> That's better, but aren't there already operators on time64_t data objects
> that can be used for this?
No idea.
--b.
>
>
> > --b.
> >
> > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > index 61552e89bd89..00fb3603c29e 100644
> > --- a/fs/nfsd/nfs4state.c
> > +++ b/fs/nfsd/nfs4state.c
> > @@ -5363,6 +5363,22 @@ static bool clients_still_reclaiming(struct nfsd_net *nn)
> > return true;
> > }
> >
> > +struct laundry_time {
> > + time64_t cutoff;
> > + time64_t new_timeo;
> > +};
> > +
> > +bool state_expired(struct laundry_time *lt, time64_t last_refresh)
> > +{
> > + time64_t time_remaining;
> > +
> > + if (last_refresh > lt->cutoff)
> > + return true;
> > + time_remaining = lt->cutoff - last_refresh;
> > + lt->new_timeo = min(lt->new_timeo, time_remaining);
> > + return false;
> > +}
> > +
> > static time64_t
> > nfs4_laundromat(struct nfsd_net *nn)
> > {
> > @@ -5372,14 +5388,16 @@ nfs4_laundromat(struct nfsd_net *nn)
> > struct nfs4_ol_stateid *stp;
> > struct nfsd4_blocked_lock *nbl;
> > struct list_head *pos, *next, reaplist;
> > - time64_t cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease;
> > - time64_t t, new_timeo = nn->nfsd4_lease;
> > + struct laundry_time lt = {
> > + .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
> > + .new_timeo = nn->nfsd4_lease
> > + };
> > struct nfs4_cpntf_state *cps;
> > copy_stateid_t *cps_t;
> > int i;
> >
> > if (clients_still_reclaiming(nn)) {
> > - new_timeo = 0;
> > + lt.new_timeo = 0;
> > goto out;
> > }
> > nfsd4_end_grace(nn);
> > @@ -5389,7 +5407,7 @@ nfs4_laundromat(struct nfsd_net *nn)
> > idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
> > cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
> > if (cps->cp_stateid.sc_type == NFS4_COPYNOTIFY_STID &&
> > - cps->cpntf_time < cutoff)
> > + state_expired(<, cps->cpntf_time))
> > _free_cpntf_state_locked(nn, cps);
> > }
> > spin_unlock(&nn->s2s_cp_lock);
> > @@ -5397,11 +5415,8 @@ nfs4_laundromat(struct nfsd_net *nn)
> > spin_lock(&nn->client_lock);
> > list_for_each_safe(pos, next, &nn->client_lru) {
> > clp = list_entry(pos, struct nfs4_client, cl_lru);
> > - if (clp->cl_time > cutoff) {
> > - t = clp->cl_time - cutoff;
> > - new_timeo = min(new_timeo, t);
> > + if (!state_expired(<, clp->cl_time))
> > break;
> > - }
> > if (mark_client_expired_locked(clp)) {
> > trace_nfsd_clid_expired(&clp->cl_clientid);
> > continue;
> > @@ -5418,11 +5433,8 @@ nfs4_laundromat(struct nfsd_net *nn)
> > spin_lock(&state_lock);
> > list_for_each_safe(pos, next, &nn->del_recall_lru) {
> > dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
> > - if (dp->dl_time > cutoff) {
> > - t = dp->dl_time - cutoff;
> > - new_timeo = min(new_timeo, t);
> > + if (!state_expired(<, clp->cl_time))
> > break;
> > - }
> > WARN_ON(!unhash_delegation_locked(dp));
> > list_add(&dp->dl_recall_lru, &reaplist);
> > }
> > @@ -5438,11 +5450,8 @@ nfs4_laundromat(struct nfsd_net *nn)
> > while (!list_empty(&nn->close_lru)) {
> > oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
> > oo_close_lru);
> > - if (oo->oo_time > cutoff) {
> > - t = oo->oo_time - cutoff;
> > - new_timeo = min(new_timeo, t);
> > + if (!state_expired(<, oo->oo_time))
> > break;
> > - }
> > list_del_init(&oo->oo_close_lru);
> > stp = oo->oo_last_closed_stid;
> > oo->oo_last_closed_stid = NULL;
> > @@ -5468,11 +5477,8 @@ nfs4_laundromat(struct nfsd_net *nn)
> > while (!list_empty(&nn->blocked_locks_lru)) {
> > nbl = list_first_entry(&nn->blocked_locks_lru,
> > struct nfsd4_blocked_lock, nbl_lru);
> > - if (nbl->nbl_time > cutoff) {
> > - t = nbl->nbl_time - cutoff;
> > - new_timeo = min(new_timeo, t);
> > + if (!state_expired(<, oo->oo_time))
> > break;
> > - }
> > list_move(&nbl->nbl_lru, &reaplist);
> > list_del_init(&nbl->nbl_list);
> > }
> > @@ -5485,8 +5491,7 @@ nfs4_laundromat(struct nfsd_net *nn)
> > free_blocked_lock(nbl);
> > }
> > out:
> > - new_timeo = max_t(time64_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
> > - return new_timeo;
> > + return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
> > }
> >
> > static struct workqueue_struct *laundry_wq;
>
> --
> Chuck Lever
>
>
