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This will simplify the refactoring of the ESX storage driver to support a VMFS and an iSCSI backend. One of the tasks the storage driver needs to do is to decide which backend driver needs to be invoked for a given request. This approach extends virStoragePool and virStorageVol to store extra parameters: 1. privateData: stores pointer to respective backend storage driver. 2. privateDataFreeFunc: stores cleanup function pointer. virGetStoragePool and virGetStorageVol are modfied to accept these extra parameters as user params. virStoragePoolDispose and virStorageVolDispose checks for cleanup operation if available. The private data pointer allows the ESX storage driver to store a pointer to the used backend with each storage pool and volume. This avoids the need to detect the correct backend in each storage driver function call.
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>