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nfsd: don't use locks_in_grace to determine whether to call nfs4_grace_end

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It's possible that lockd or another lock manager might still be on the
list after we call nfsd4_end_grace. If the laundromat thread runs
again at that point, then we could end up calling nfsd4_end_grace more
than once.

That's not only inefficient, but calling nfsd4_recdir_purge_old more
than once could be problematic. Fix this by adding a new global
"grace_ended" flag and use that to determine whether we've already
called nfsd4_grace_end.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2012-04-10 11:08:48 -04:00 committed by J. Bruce Fields
parent a9aa53df6e
commit 33dcc481ed
1 changed files with 9 additions and 2 deletions
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11
fs/nfsd/nfs4state.c
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@ -3155,10 +3155,17 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
static struct lock_manager nfsd4_manager = {
};
static bool grace_ended;
static void
nfsd4_end_grace(void)
{
/* do nothing if grace period already ended */
if (grace_ended)
return;
dprintk("NFSD: end of grace period\n");
grace_ended = true;
nfsd4_record_grace_done(&init_net, boot_time);
locks_end_grace(&nfsd4_manager);
/*
@ -3183,8 +3190,7 @@ nfs4_laundromat(void)
nfs4_lock_state();
dprintk("NFSD: laundromat service - starting\n");
if (locks_in_grace())
nfsd4_end_grace();
nfsd4_end_grace();
INIT_LIST_HEAD(&reaplist);
spin_lock(&client_lock);
list_for_each_safe(pos, next, &client_lru) {
@ -4718,6 +4724,7 @@ nfs4_state_start(void)
nfsd4_client_tracking_init(&init_net);
boot_time = get_seconds();
locks_start_grace(&nfsd4_manager);
grace_ended = false;
printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
nfsd4_grace);
ret = set_callback_cred();