Neel Natu e5db20c0c8 Use '-e' to check if the virtio backing file has already been created.
The '-f' check works fine on a regular file but not if the backing file is
a device (e.g., /dev/md0). In this case it would print a misleading but
otherwise benign message about the backing file not being present.

Submitted by:	Marcus Reid (marcus@blazingdot.com)
Discussed with:	grehan
2014-10-14 18:34:15 +00:00
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