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During virStorageBackendDiskMakeDataVol processing, if we find an extended partition, then handle it specially when updating the capacity/allocation rather than calling virStorageBackendUpdateVolInfo. As it turns out, once a logical partition exists, any attempt to refresh the pool or after libvirtd restart/reload will result in a failure to open the extended partition device resulting in the inability to start the pool. The downside to this is we will lose the <permissions> and <timestamps> for the extended partition upon subsequent restart, refresh, reload since the stat() in virStorageBackendUpdateVolTargetInfoFD will not be called. However, since it's really only a container and shouldn't directly be used for storage that seems reasonable. Therefore, only use the existing code that already had a comment about getting the allocation wrong for extended partitions for just the setting of the extended partition data.
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>