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If the volume is of a clustered volume group, and not active, the related pool APIs fails on opening /dev/vg/lv. If the volume is suspended, it hangs on open(2) the volume. Though the best solution is to expose the volume status in volume XML, and even better to provide API to activate/deactivate the volume, but it's not the work I want to touch currently. Volume status in other status is just fine to skip. About the 5th field of lv_attr (from man lvs[8]) <quote> 5 State: (a)ctive, (s)uspended, (I)nvalid snapshot, invalid (S)uspended snapshot, snapshot (m)erge failed,suspended snapshot (M)erge failed, mapped (d)evice present without tables, mapped device present with (i)nactive table </quote>
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>