> > I'm more familiar with the vmd(8) codebase than any ffs stuff, but I > > don't think the issue is the base image being r/w. > > AFAIKS, the issue is that if you start a vm modifying the base because it > uses it as a regular image, that r/o open for the other vms does not > matter a lot,
vmd could possibly refuse to use an image as a base for a derived image if it already has the base open (or vice-versa), but then some other software (e.g. qemu, qemu-img) could modify the base image too, there are always ways to break things not matter what the safeguards.
