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My RFC for snapshot support [1] proposes several rules for when it is safe to delete or revert to an external snapshot, predicated on the existence of new API flags. These will be incrementally added in future patches, but until then, blindly mishandling a disk snapshot risks corrupting internal state, so it is better to outright reject the attempts until the other pieces are in place, thus incrementally relaxing the restrictions added in this patch. [1] https://www.redhat.com/archives/libvir-list/2011-August/msg00361.html * src/qemu/qemu_driver.c (qemuDomainSnapshotCountExternal): New function. (qemuDomainUndefineFlags, qemuDomainSnapshotDelete): Use it to add safety valve. (qemuDomainRevertToSnapshot, qemuDomainSnapshotCreateXML): Add safety valve.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>