neither vmdk images with multiple children, nor ones with multiple extents (that might in turn be backed by multiple files) are allowed when an image is untrusted. Reported-by: Friedrich Weber <f.weber@proxmox.com> Suggested-by: Thomas Lamprecht <t.lamprecht@proxmox.com> Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>