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It turns out that one-bit filtering makes it hard to select the inverse set, so it is easier to provide filtering groups. For back-compat, omitting all bits within a group means the group is not used for filtering, and by definition of a group (each snapshot matches exactly one bit within the group, and the set of bits in the group covers all snapshots), selecting all bits also makes the group useless. Unfortunately, virDomainSnapshotListChildren defined the bit VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS as an expansion rather than a filter, so we cannot make it part of a filter group, so that bit (and its counterpart VIR_DOMAIN_SNAPSHOT_LIST_ROOTS for virDomainSnapshotList) remains a single control bit. * include/libvirt/libvirt.h.in (virDomainSnapshotListFlags): Add a couple more flags. * src/libvirt.c (virDomainSnapshotNum) (virDomainSnapshotNumChildren): Document them. (virDomainSnapshotListNames, virDomainSnapshotListChildrenNames): Likewise, and add thread-safety caveats. * src/conf/virdomainlist.h (VIR_DOMAIN_SNAPSHOT_FILTERS_*): New convenience macros. * src/conf/domain_conf.c (virDomainSnapshotObjListCopyNames) (virDomainSnapshotObjListCount): Support the new flags.
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>