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

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

On Thu, Apr 20, 2017 at 11:42:00AM -0400, Jeff Cody wrote:
> On Thu, Apr 20, 2017 at 04:30:16PM +0100, Daniel P. Berrange wrote:
> > 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'. So AFAICT the new error_setg is
> > just throwing away the real detailed error message in favour of
> > a generic message.
> > 
> > So I'm puzzelled why we need to change anything - error reporting
> > should already be working fine.
> > 
> 
> Indeed, you are right. (Dequeuing patch)
> 
> It would also make more sense to check fd after the socket_connect() call
> and return error then, rather than keep checking fd throughout the rest of
> the function.

Yeah that would make it much more obvious that the error reporting is
correct.

Regards,
Daniel
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