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From: Juan Quintela <quintela@redhat.com>
In-Reply-To: <87has5zoww.fsf@blackfin.pond.sub.org> (Markus Armbruster's
	message of "Tue, 14 Aug 2012 13:35:59 +0200")
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Date: Tue, 14 Aug 2012 15:09:45 +0200
Message-ID: <87ehn9wrfq.fsf@elfo.mitica>
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Subject: Re: [Qemu-devel] [PATCH 15/35] migration: don't rely on any
	QERR_SOCKET_*
Reply-To: quintela@redhat.com
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To: Markus Armbruster <armbru@redhat.com>
Cc: kwolf@redhat.com, aliguori@us.ibm.com, mdroth@linux.vnet.ibm.com, qemu-devel@nongnu.org, pbonzini@redhat.com, Luiz Capitulino <lcapitulino@redhat.com>, eblake@redhat.com

Markus Armbruster <armbru@redhat.com> wrote:
> Juan Quintela <quintela@redhat.com> writes:
>
>> Markus Armbruster <armbru@redhat.com> wrote:
>>> Luiz Capitulino <lcapitulino@redhat.com> writes:
>>>
>>>> Use the in_progress argument for QERR_SOCKET_CONNECT_IN_PROGRESS. The
>>>> other errors are handled the same by checking if the error is set and
>>>> then calling migrate_fd_error() if it's.
>>>>
>>>> It's also necessary to change inet_connect_opts() not to set
>>>> QERR_SOCKET_CONNECT_IN_PROGRESS. This error is only used by
>>>> tcp_start_outgoing_migration() and not changing it along with the
>>>> usage of in_progress would break migration.
>>>>
>>>> Furthermore this commit fixes a bug. Today, there's a spurious error
>>>> report when migration succeeds:
>>>>
>>>> (qemu) migrate tcp:0:4444
>>>> migrate: Connection can not be completed immediately
>>>> (qemu)
>>>>
>>>> After this commit no spurious error is reported anymore.
>>>>
>>>> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
>>>
>>> I'd prefer
>>>
>>>        s->fd = inet_connect(host_port, false, &in_progress, errp);
>>>        if (error_is_set(errp)) {
>>>            migrate_fd_error(s);
>>>            return -1;
>>>        }
>>>        if (in_progress) {
>>>            DPRINTF("connect in progress\n");
>>>            qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
>>>        } else {
>>>            migrate_fd_connect(s);
>>>        }
>>>        return 0;
>>>
>>> because it separates abnormal and normal code paths more clearly.
>>>
>>> Matter of taste.
>>
>>
>> The 1st migrate_fd_error() is not needed (it was already wrong).
>>
>> migrate_fd_* functions are supposed to be called only after
>> migrate_fd_connect() has been called.
>
> It's been committed.  Could you post a patch for it?

I am doing it.  Thanks.