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nfsd4: extend reclaim period for reclaiming clients

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If the client is only renewing state a little sooner than once a lease
period, then it might not discover the server has restarted till close
to the end of the grace period, and might run out of time to do the
actual reclaim.

Extend the grace period by a second each time we notice there are
clients still trying to reclaim, up to a limit of another whole lease
period.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
2018-06-08 12:28:47 -04:00
parent ce397d215c
commit 03f318ca65
4 changed files with 36 additions and 1 deletions
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fs/nfsd/nfsctl.c
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@@ -1239,6 +1239,7 @@ static __net_init int nfsd_init_net(struct net *net)
goto out_idmap_error;
nn->nfsd4_lease = 90; /* default lease time */
nn->nfsd4_grace = 90;
nn->somebody_reclaimed = false;
nn->clverifier_counter = prandom_u32();
nn->clientid_counter = prandom_u32();