On 09/02/2014 04:25 PM, Max Reitz wrote: > Specify the upper limit of refcount_order to be 6 (that is, > refcount_bits = 64). Any larger value does not make much sense when all > offsets, sizes, cluster counts etc. "only" have a width of 64 bit as > well, and very large values would be very difficult to support. > Therefore, just cap it at the largest reasonable value. > > Suggested-by: Eric Blake <ebl...@redhat.com> > Signed-off-by: Max Reitz <mre...@redhat.com> > --- > docs/specs/qcow2.txt | 1 + > 1 file changed, 1 insertion(+)
Reviewed-by: Eric Blake <ebl...@redhat.com> > > diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt > index 0a878aa..121dfc8 100644 > --- a/docs/specs/qcow2.txt > +++ b/docs/specs/qcow2.txt > @@ -110,6 +110,7 @@ in the description of a field. > in bits: refcount_bits = 1 << refcount_order). For > version 2 > images, the order is always assumed to be 4 > (i.e. refcount_bits = 16). > + This value may not exceed 6 (i.e. refcount_bits = 64). > > 100 - 103: header_length > Length of the header structure in bytes. For version 2 > -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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