[Ocfs2-devel] [PATCH] ocfs2: o2net: fix connect expired

[Junxiao Bi <junxiao.bi@oracle.com>]

----- srinivas.eeda at oracle.com wrote:

> Hi Junxiao,
> 
> thanks for explaining. For this case allowing a reconnect (setting 
> "atomic_set(&nn->nn_timeout, 1);" ) in o2net_connect_expired should
> work ?
Hi Srini,

Yes, that should also work for this case. But it breaks the usage of nn_timeout, it is only used for idle timeout.

Thanks,
Junxiao.
> 
> Thanks,
> --Srini
> 
> 
> On 10/29/2014 10:32 PM, Junxiao Bi wrote:
> > Hi Srini,
> >
> > On 10/30/2014 01:16 PM, Srinivas Eeda wrote:
> >> Junxiao,
> >>
> >> can you please describe under what circumstances you saw this
> problem?
> >> My understanding is o2net_connect_expired is only queued when
> connection
> >> actually broke and ENOTCONN is the right error in that case.
> > This happened when o2net was issuing the first connect request to
> some
> > node, but the request packet is lost due to some error like network
> > broken, then the connect would be expired, in
> o2net_connect_expired()
> > that set nn->nn_persistent_error to -ENOTCONN but timeout was zero,
> so
> > o2net_start_connect() would return without sending another connect
> > request, connection to the node will never be built.
> >
> > Thanks,
> > Junxiao.
> >
> >> Thanks,
> >> --Srini
> >>
> >> On 10/29/2014 06:41 PM, Junxiao Bi wrote:
> >>> Set nn_persistent_error to -ENOTCONN will stop reconnect since
> the
> >>> "stop" condition in o2net_start_connect() will be true.
> >>>
> >>> stop = (nn->nn_sc ||
> >>>          (nn->nn_persistent_error &&
> >>>          (nn->nn_persistent_error != -ENOTCONN || timeout ==
> 0)));
> >>>
> >>> This will make connection never be established if the first
> connection
> >>> request
> >>> is lost.
> >>>
> >>> Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
> >>> ---
> >>>    fs/ocfs2/cluster/tcp.c |    2 +-
> >>>    1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
> >>> index 97de0fb..4d6b645 100644
> >>> --- a/fs/ocfs2/cluster/tcp.c
> >>> +++ b/fs/ocfs2/cluster/tcp.c
> >>> @@ -1736,7 +1736,7 @@ static void o2net_connect_expired(struct
> >>> work_struct *work)
> >>>                 o2net_idle_timeout() / 1000,
> >>>                 o2net_idle_timeout() % 1000);
> >>>    -        o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
> >>> +        o2net_set_nn_state(nn, NULL, 0, 0);
> >>>        }
> >>>        spin_unlock(&nn->nn_lock);
> >>>    }