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When we are changing media (or doing other hotplug operations) we need to setup cgroups, locking and seclabels on the new disk. This is a multi-step process where every piece can fail. To simplify dealing with this introduce qemuDomainPrepareDisk that similarly to qemuDomainPrepareDiskChainElement initializes/tears down a whole new disk to be used with the domain. Additionally the function supports passing a different source struct for media changes of cdroms that will be refactored later.
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>