qcow2: Prevent backing file names longer than 1023
We reject backing file names with a length of more than 1023 characters when opening a qcow2 file, so we should not produce such files ourselves. Cc: qemu-stable@nongnu.org Signed-off-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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