[libvirt] [PATCH 5/7] Storage driver implementation for CreateXMLFrom

[Daniel P. Berrange]

On Mon, May 04, 2009 at 01:43:00PM -0400, Cole Robinson wrote:
> There is some funkiness here, since we are either dealing with 2 different
> pools (which means validation x 2) or the same pool, where we have to be
> careful not to deadlock.

Ahhh, tricky stuff.

> +
> +    newvol->building = 1;
> +    buildret = backend->buildVolFrom(obj->conn, newvol, origvol, flags);
> +    newvol->building = 0;
> +    newvol = NULL;

I'm wondering if we should also take care to mark origvol->building as
non-zero, to incidate that it is in use too.  Regardless though, we
need to ensure buildVolFrom is safe against someone deleting the file 
from the filesystem behind our back

Daniel
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