From 7f7e7a4006f74b031718055a0751c70c2e3d5e7e Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Tue, 2 Mar 2021 10:46:23 -0500 Subject: [PATCH] nfsd: helper for laundromat expiry calculations We do this same logic repeatedly, and it's easy to get the sense of the comparison wrong. Signed-off-by: J. Bruce Fields Signed-off-by: Chuck Lever --- fs/nfsd/nfs4state.c | 49 +++++++++++++++++++++++++++---------------------- 1 file changed, 27 insertions(+), 22 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 3290d0a7bb95..1aa7d4ee7c15 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -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(<, 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(<, 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(<, 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(<, 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(<, 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; -- 2.11.0