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For all types of disks other than qcow2, we were requesting that SELinux labeling visit the new file as if it were qcow2, which means labeling would try to find the backing files of an empty file. And for a pre-existing qcow2 disk, we were passing NULL, which meant that labelling tried to probe the file type (and if probing is disabled, per the default qemu.conf, this made snapshots fail). What we really want is to make SELinux labeling visit the new file as raw; it will later be converted to qcow2 if qemu successfully made the snapshot. * src/qemu/qemu_driver.c (qemuDomainSnapshotCreateSingleDiskActive): Force SELinux labeling to avoid probe of new file.
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>