QA output created by 218 zero-length file: Before: 0 After: 0 Sparse file (no blocks): Before: 0 After: 0 Contiguous file: Before: 1 After: 1 Write backwards sync, but contiguous - should defrag to 1 extent Before: 10 After: 1 Write backwards sync leaving holes - defrag should do nothing Before: 16 After: 16 Write forwards sync leaving holes - defrag should do nothing Before: 16 After: 16