On Wed, Jun 29, 2011 at 7:18 AM, Fam Zheng <famc...@gmail.com> wrote: > No error report with writing (dd of=/dev/sda ...), but can't change > data, (dd if=/dev/sda) dump unchanged.
I suggest we return EIO on non-allocating writes. That way the user will know there is a problem with what they are trying to do. qemu-img convert will work fine but running read-write guests will error. Stefan
