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nfsd: helper for laundromat expiry calculations

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We do this same logic repeatedly, and it's easy to get the sense of the
comparison wrong.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
J. Bruce Fields 2021-03-02 10:46:23 -05:00 committed by Chuck Lever
parent 219a170502
commit 7f7e7a4006
1 changed files with 27 additions and 22 deletions
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49
fs/nfsd/nfs4state.c
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@ -5338,6 +5338,22 @@ static bool clients_still_reclaiming(struct nfsd_net *nn)
return true;
}
struct laundry_time {
time64_t cutoff;
time64_t new_timeo;
};
static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
{
time64_t time_remaining;
if (last_refresh < lt->cutoff)
return true;
time_remaining = last_refresh - lt->cutoff;
lt->new_timeo = min(lt->new_timeo, time_remaining);
return false;
}
static time64_t
nfs4_laundromat(struct nfsd_net *nn)
{
@ -5347,14 +5363,16 @@ 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);
@ -5364,7 +5382,7 @@ 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(&lt, cps->cpntf_time))
_free_cpntf_state_locked(nn, cps);
}
spin_unlock(&nn->s2s_cp_lock);
@ -5372,11 +5390,8 @@ 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(&lt, clp->cl_time))
break;
}
if (mark_client_expired_locked(clp)) {
trace_nfsd_clid_expired(&clp->cl_clientid);
continue;
@ -5393,11 +5408,8 @@ 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(&lt, dp->dl_time))
break;
}
WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
@ -5413,11 +5425,8 @@ 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(&lt, oo->oo_time))
break;
}
list_del_init(&oo->oo_close_lru);
stp = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = NULL;
@ -5443,11 +5452,8 @@ 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(&lt, nbl->nbl_time))
break;
}
list_move(&nbl->nbl_lru, &reaplist);
list_del_init(&nbl->nbl_list);
}
@ -5460,8 +5466,7 @@ 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;