> > +##
> > +# @ImageInfo:
> > +#
> > +# Information about a QEMU image file
> > +#
> > +# @filename: name of the image file
> > +#
> > +# @format: format of the image file
> > +#
> > +# @virtual-size: maximum capacity in bytes of the image
> > +#
> > +# @actual-size: #optional actual size on disk in bytes of the image
> 
> That seems backwards - with a raw file, don't you know the actual size,
> but have no idea what it can further grow to?
Try the current qemy-img info on a raw file you will be surprised of the 
results.
This field also can have an "unavailable" value.

example result with unpatched qemu-img:

benoit@Laure:~/qemu$ qemu-img info truc1.raw 
image: truc1.raw
file format: raw
virtual size: 1.0G (1073741824 bytes)
disk size: 776M

disk size is actual-size.

Benoît


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