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Both system checkpoint snapshots and disk snapshots were iterating over all disks, doing a final sanity check before doing any work. But since future patches will allow offline snapshots to be either external or internal, it makes sense to share the pass over all disks, and then relax restrictions in that pass as new modes are implemented. Future patches can then handle external disks when the domain is offline, then handle offline --disk-snapshot, and finally, combine with migration to file to gain a complete external system checkpoint snapshot of an active domain without using 'savevm'. * src/qemu/qemu_driver.c (qemuDomainSnapshotDiskPrepare) (qemuDomainSnapshotIsAllowed): Merge... (qemuDomainSnapshotPrepare): ...into one function. (qemuDomainSnapshotCreateXML): Update caller.
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>