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3c4f2e3fb7
https://bugzilla.redhat.com/show_bug.cgi?id=1439132 During 'matrix' testing of all possible combinations I found that if device is formated with "gpt" first, then an attempt is made to format using "mac", a startup will fail. Deeper analysis by Peter Krempa indicates that the "mac" table fits into the first block on the disk. Since the GPT disklabel is stored at LBA address 1 it is not overwritten at all. Thus it's apparent that the (blkid) detection tool then prefers GPT over a older disklabel. The GPT disklabel has also a secondary copy at the last LBA of the disk. So, follow the same logic as the logical pool in clearing a 1MB swath at the beginning and end of the device to avoid potential issues with larger sector sizes for the device. Also fixed a minor formatting nit in virStorageBackendDeviceIsEmpty 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>