[Libguestfs] [PATCH nbdkit v5 FINAL 00/19] Implement extents.

[Richard W.M. Jones]

On Fri, Mar 29, 2019 at 07:13:18AM -0500, Eric Blake wrote:
> On 3/29/19 3:52 AM, Richard W.M. Jones wrote:
> 
> >> The full and null plugins should probably have a trivial .extents that
> >> reports completely sparse, all of the time :)
> > 
> > I think it would be wrong for full wouldn't it?  It could mean that
> > the client would skip the read, thus not getting the intended ENOSPC
> > error.  For null I agree.
> > 
> 
> The full plugin always reads as 0 successfully. It is only writes that
> differ (successfully ignored vs ENOSPC) between the two plugins.

Ah yes, my mistake.  In that case yes we can return extents.
I'll add the simple patch.

I already did this for the null plugin:

https://github.com/libguestfs/nbdkit/commit/8b5adddbf06a6ba785e7d0409910281922cbea42

So the full plugin would be the same.

Rich.

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