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NFSD: simplify error paths in nfsd_svc()

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commit bf32075256 upstream.

The error paths in nfsd_svc() are needlessly complex and can result in a
final call to svc_put() without nfsd_last_thread() being called.  This
results in the listening sockets not being closed properly.

The per-netns setup provided by nfsd_startup_new() and removed by
nfsd_shutdown_net() is needed precisely when there are running threads.
So we don't need nfsd_up_before.  We don't need to know if it *was* up.
We only need to know if any threads are left.  If none are, then we must
call nfsd_shutdown_net().  But we don't need to do that explicitly as
nfsd_last_thread() does that for us.

So simply call nfsd_last_thread() before the last svc_put() if there are
no running threads.  That will always do the right thing.

Also discard:
 pr_info("nfsd: last server has exited, flushing export cache\n");
It may not be true if an attempt to start the first server failed, and
it isn't particularly helpful and it simply reports normal behaviour.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reported-by: Li Lingfeng <lilingfeng3@huawei.com>
Suggested-by: Li Lingfeng <lilingfeng3@huawei.com>
Tested-by: Li Lingfeng <lilingfeng3@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2023-09-25 12:06:44 +10:00 committed by Greg Kroah-Hartman
parent b12caa8f08
commit e0aeb26b04
1 changed files with 4 additions and 10 deletions
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14
fs/nfsd/nfssvc.c
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@ -567,7 +567,6 @@ void nfsd_last_thread(struct net *net)
return; return;
nfsd_shutdown_net(net); nfsd_shutdown_net(net);
pr_info("nfsd: last server has exited, flushing export cache\n");
nfsd_export_flush(net); nfsd_export_flush(net);
} }
@ -783,7 +782,6 @@ int
nfsd_svc(int nrservs, struct net *net, const struct cred *cred) nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
{ {
int error; int error;
bool nfsd_up_before;
struct nfsd_net *nn = net_generic(net, nfsd_net_id); struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_serv *serv; struct svc_serv *serv;
@ -803,8 +801,6 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
error = nfsd_create_serv(net); error = nfsd_create_serv(net);
if (error) if (error)
goto out; goto out;
nfsd_up_before = nn->nfsd_net_up;
serv = nn->nfsd_serv; serv = nn->nfsd_serv;
error = nfsd_startup_net(net, cred); error = nfsd_startup_net(net, cred);
@ -812,17 +808,15 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
goto out_put; goto out_put;
error = svc_set_num_threads(serv, NULL, nrservs); error = svc_set_num_threads(serv, NULL, nrservs);
if (error) if (error)
goto out_shutdown; goto out_put;
error = serv->sv_nrthreads; error = serv->sv_nrthreads;
if (error == 0)
nfsd_last_thread(net);
out_shutdown:
if (error < 0 && !nfsd_up_before)
nfsd_shutdown_net(net);
out_put: out_put:
/* Threads now hold service active */ /* Threads now hold service active */
if (xchg(&nn->keep_active, 0)) if (xchg(&nn->keep_active, 0))
svc_put(serv); svc_put(serv);
if (serv->sv_nrthreads == 0)
nfsd_last_thread(net);
svc_put(serv); svc_put(serv);
out: out:
mutex_unlock(&nfsd_mutex); mutex_unlock(&nfsd_mutex);