5a1cf6b storage: Return backing format from virStorageFileGetMetadataFromFD

Authored and Committed by Peter Krempa 9 years ago
    storage: Return backing format from virStorageFileGetMetadataFromFD
    
    Add argument to return backing file format of a file probed by
    virStorageFileGetMetadataFromFD so that it can be used in place of
    virStorageFileGetMetadataFromBuf.
    
        
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