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Domain snapshots should only permit an external snapshot into a storage format that permits a backing chain, since the new snapshot file necessarily must be backed by the existing file. The C code for the qemu driver is a little bit stricter in currently enforcing only qcow2 or qed, but at the XML parser level, including virt-xml-validate, it is fairly easy to enforce that a user can't request a 'raw' external snapshot. * docs/schemas/storagecommon.rng (storageFormat): Split out... (storageFormatBacking): ...new sublist. * docs/schemas/domainsnapshot.rng (disksnapshotdriver): Use new type. * src/util/virstoragefile.h (virStorageFileFormat): Rearrange for easier code management. * src/util/virstoragefile.c (virStorageFileFormat, fileTypeInfo): Likewise. * src/conf/snapshot_conf.c (virDomainSnapshotDiskDefParseXML): Use new marker to limit selection of formats. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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>