Attached find essentially the same debdiff I sent to Debian; it just has
the version number in it changed, and the changelog entry refers to the
Launchpad bug number rather than the Debian one. Apart from that, it's
the same patch.

As I said on the Debian bugtracker, I ran into two non-critical issues.
First, the backing-file name isn't stored in a NUL-terminated format;
pretending that it's NUL-terminated seems to work, but since I couldn't
figure out how to specify a string length based on an indirect value,
it's not being done the *right* way. Second, The offset to the backing-
file name in qcow2 images is a 64-bit quantity, but there's no way to
put in a 64-bit offset. I cheated and assumed that the top four bytes
are zero; this works on newly-created images, at least, though I can't
guarantee that it'll work in the general case.

** Attachment added: "Debdiff against 4.26-2."
   http://launchpadlibrarian.net/21946270/198232-qemu.debdiff

-- 
file reports negative size for QCOW images
https://bugs.launchpad.net/bugs/198232
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