Re: [Qemu-devel] [Qemu-block] [PATCH RFC v3 3/8] block: add throttle block filter driver

[Stefan Hajnoczi]

On Mon, Jun 26, 2017 at 07:26:41PM +0300, Manos Pitsidianakis wrote:
> On Mon, Jun 26, 2017 at 03:30:55PM +0100, Stefan Hajnoczi wrote:
> > > +    bs->file = bdrv_open_child(NULL, options, "file",
> > > +                                    bs, &child_file, false, &local_err);
> > > +
> > > +    if (local_err) {
> > > +        error_propagate(errp, local_err);
> > > +        return -EINVAL;
> > > +    }
> > > +
> > > +    qdict_flatten(options);
> > > +    return throttle_configure_tgm(bs, tgm, options, errp);
> > 
> > Who destroys bs->file on error?
> 
> It is reaped by bdrv_open_inherit() on failure, if I'm not mistaken.
> That's how other drivers handle this as well. Some (eg block/qcow2.c)
> check if bs->file is NULL instead of the error pointer they pass, so
> this is not not very consistent.

Maybe I'm missing it but I don't see relevant bs->file cleanup in
bdrv_open_inherit() or bdrv_open_common().

Please post the exact line where it happens.

Stefan

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