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getting wedge information (esp. size) in kenrel ?

right now, the Xen block device backend gets the size information
of the backing device with
VOP_IOCTL(xbdi->xbdi_vp, DIOCGPART, &dpart, FREAD, 0);
but with this the size information is trucated to 32bits. If xbdi_vp points
to a wedge device, is there a way to get its 64bit size (and how do I
know it's a wedge in the first place) ?

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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