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From:   Anna Schumaker <anna@kernel.org>
Date:   Tue, 7 Jun 2022 13:18:34 -0400
Message-ID: <CAFX2Jfm8Dk83owBu7eQ72==394u1HaStSydXx6T=B3fC8FXt4g@mail.gmail.com>
Subject: Re: [PATCH] sunrpc: set cl_max_connect when cloning an rpc_clnt
To:     Scott Mayhew <smayhew@redhat.com>
Cc:     Trond Myklebust <trond.myklebust@hammerspace.com>,
        Olga Kornievskaia <kolga@netapp.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
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On Tue, Jun 7, 2022 at 8:53 AM Scott Mayhew <smayhew@redhat.com> wrote:
>
> On Mon, 06 Jun 2022, Anna Schumaker wrote:
>
> > Hi Scott,
> >
> > On Wed, Jun 1, 2022 at 1:34 PM Scott Mayhew <smayhew@redhat.com> wrote:
> > >
> > > If the initial attempt at trunking detection using the krb5i auth flavor
> > > fails with -EACCES, -NFS4ERR_CLID_INUSE, or -NFS4ERR_WRONGSEC, then the
> > > NFS client tries again using auth_sys, cloning the rpc_clnt in the
> > > process.  If this second attempt at trunking detection succeeds, then
> > > the resulting nfs_client->cl_rpcclient winds up having cl_max_connect=0
> > > and subsequent attempts to add additional transport connections to the
> > > rpc_clnt will fail with a message similar to the following being logged:
> > >
> > > [502044.312640] SUNRPC: reached max allowed number (0) did not add
> > > transport to server: 192.168.122.3
> >
> > Good catch! I was wondering if you could give me a "Fixes:" tag so it
> > can be backported to stable?
>
> Fixes: dc48e0abee24 ("SUNRPC enforce creation of no more than max_connect xprts")

Thanks! Applied for a -rc pull request

>
> >
> > Thanks,
> > Anna
> >
> > >
> > > Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> > > ---
> > >  net/sunrpc/clnt.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> > > index e2c6eca0271b..b6781ada3aa8 100644
> > > --- a/net/sunrpc/clnt.c
> > > +++ b/net/sunrpc/clnt.c
> > > @@ -651,6 +651,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
> > >         new->cl_discrtry = clnt->cl_discrtry;
> > >         new->cl_chatty = clnt->cl_chatty;
> > >         new->cl_principal = clnt->cl_principal;
> > > +       new->cl_max_connect = clnt->cl_max_connect;
> > >         return new;
> > >
> > >  out_err:
> > > --
> > > 2.35.3
> > >
> >
>