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There are slight differences in various ZFS implementations. Specifically, ZFS on FreeBSD requires to set value of 'volmode' option to 'dev' to expose volumes as raw disk device (that's what we need) rather than geom provides, for example. With ZFS on Linux, however, such option is not available and volumes exposed like we need by default. To make our implementation more flexible, only pass 'volmode' when it's supported. Support is checked by parsing usage information of the 'zfs get' command.
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>