5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: NeilBrown <neilb@xxxxxxx>
[ Upstream commit bf32075256e9dd9c6b736859e2c5813981339908 ]
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@xxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfsd/nfssvc.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -567,7 +567,6 @@ void nfsd_last_thread(struct net *net)
return;
nfsd_shutdown_net(net);
- pr_info("nfsd: last server has exited, flushing export cache\n");
nfsd_export_flush(net);
}
@@ -782,7 +781,6 @@ int
nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
{
int error;
- bool nfsd_up_before;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_serv *serv;
@@ -802,8 +800,6 @@ nfsd_svc(int nrservs, struct net *net, c
error = nfsd_create_serv(net);
if (error)
goto out;
-
- nfsd_up_before = nn->nfsd_net_up;
serv = nn->nfsd_serv;
error = nfsd_startup_net(net, cred);
@@ -811,17 +807,15 @@ nfsd_svc(int nrservs, struct net *net, c
goto out_put;
error = svc_set_num_threads(serv, NULL, nrservs);
if (error)
- goto out_shutdown;
+ goto out_put;
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:
/* Threads now hold service active */
if (xchg(&nn->keep_active, 0))
svc_put(serv);
+
+ if (serv->sv_nrthreads == 0)
+ nfsd_last_thread(net);
svc_put(serv);
out:
mutex_unlock(&nfsd_mutex);
