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SubjectRe: [Xen-devel] [PATCH v2] xen-blkfront: remove type check from blkfront_setup_discard
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On Mon, 2014-01-13 at 12:34 +0000, Jan Beulich wrote:
> >>> On 13.01.14 at 13:01, Olaf Hering <olaf@aepfle.de> wrote:
> > On Mon, Jan 13, Jan Beulich wrote:
> >
> >> You can't do this in one go - the first two and the last one may be
> >> set independently (and are independent in their meaning), and
> >> hence need to be queried independently (xenbus_gather() fails
> >> on the first absent value).
> >
> > Yes, thats the purpose. Since the properties are required its an all or
> > nothing thing. If they are truly optional then blkif.h should be updated
> > to say that.
>
> They _are_ optional.

But is it true that either they are all present or they are all absent?

Ian.




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