qemu: domain: Reject copy_on_read for read-only disks
The sectors read from the backing image need to be written to the top level image. If a disk is marked read-only the image can't be written. QEMU handled that by disabling copy_on_read and reporting a warning: -drive file=/var/lib/libvirt/images/c,format=qcow2,if=none, id=drive-scsi0-0-1,readonly=on,copy-on-read=on: warning: disabling copy-on-read on read-only drive Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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