Re: [Qemu-devel] [PATCH] sheepdog: Set error when connection fails

["Daniel P. Berrange" <berrange@redhat.com>]

On Fri, Apr 21, 2017 at 07:43:36AM +0200, Markus Armbruster wrote:
> Kevin Wolf <kwolf@redhat.com> writes:
> 
> > Am 20.04.2017 um 17:30 hat Daniel P. Berrange geschrieben:
> >> On Thu, Apr 20, 2017 at 12:00:03PM +0800, Fam Zheng wrote:
> >> > Signed-off-by: Fam Zheng <famz@redhat.com>
> >> > ---
> >> >  block/sheepdog.c | 1 +
> >> >  1 file changed, 1 insertion(+)
> >> > 
> >> > diff --git a/block/sheepdog.c b/block/sheepdog.c
> >> > index fb9203e..7e889ee 100644
> >> > --- a/block/sheepdog.c
> >> > +++ b/block/sheepdog.c
> >> > @@ -608,6 +608,7 @@ static int connect_to_sdog(BDRVSheepdogState *s, Error **errp)
> >> >          qemu_set_nonblock(fd);
> >> >      } else {
> >> >          fd = -EIO;
> >> > +        error_setg(errp, "Failed to connect to sheepdog server");
> >> >      }
> >> 
> >> This doesn't make much sense to me. The lines just above the
> >> diff context have this:
> >> 
> >>     fd = socket_connect(s->addr, errp, NULL, NULL);
> >> 
> >> socket_connect should have already reported an error on "errp"
> >> in the scenario that 'fd == -1'.
> >
> > By the way, am I the only one who thinks that having errp anywhere else
> > than as the last argument is bad style? I can easily see myself missing
> > that this functions sets it because the last argument is NULL.
> 
> Yes, it's bad style because it's suprising.  Worth fixing.

In fact we can simply delete the last two arguments to socket_connect()
entirely. Most code is now switched over to use QIOChannel APIs, so we
don't have anything which uses the non-blocking connect feature of
socket_connect() anymore.

Regards,
Daniel
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