The following two fixes by Jürgen Keil have been in qemu for a year now.
They are still missing in ioemu.
[Qemu-devel] PATCH: qcow2 image corruption
http://lists.gnu.org/archive/html/qemu-devel/2007-03/msg00773.html
[Qemu-devel] [PATCH] qcow2: release refcount table clusters of the old
table, after growing the refcount table
http://lists.gnu.org/archive/html/qemu-devel/2007-04/msg00043.html
Signed-off-by: Kevin Wolf <kwolf@suse.de>
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