[ClusterLabs] Antw: Re: Antw: Re: [Cluster-devel] DLM connection channel switch take too long time (> 5mins)

[Ulrich Windl]

>>> Guoqing Jiang <gqjiang at suse.com> schrieb am 13.03.2018 um 05:00 in Nachricht
<87a8e0e7-63f3-2329-6598-1fa80b1b12d5 at suse.com>:

> 
> On 03/08/2018 07:24 PM, Ulrich Windl wrote:
>> Hi!
>>
>> What surprises me most is that a connect(...O_NONBLOCK) actually blocks:
>>
>> EINPROGRESS
>>                The  socket  is  non-blocking  and the connection cannot be 
> com-
>>                pleted immediately.
>>
> 
> Maybe it is because that the socket is created by sock_create_kern, and
> O_NONBLOCK flag is not worked  since __sctp_connect has the following
> description.
> 
>         /* in-kernel sockets don't generally have a file allocated to them
>           * if all they do is call sock_create_kern().
>           */
>          if (sk->sk_socket->file)
>                  f_flags = sk->sk_socket->file->f_flags;
> 
>          timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);

But O_NONBLOCK is still passed to sock_sndtimeo() (unless the intention was "f_flags & ~O_NONBLOCK").

> 
> Thanks,
> Guoqing
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