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This is my effort to create a unionfs filesystem implementation which is way more flexible than the current in-kernel unionfs solution.

I'm open to patches, suggestions, whatever...

The preferred way is the mailing list at or see

Why choose this stuff

  • The filesystem has to be mounted after the roots are mounted when using the standard module. With unionfs-fuse, you can mount the roots later and their contents will appear seamlesly
  • You get caching which speeds things up a lot for free
  • Advanced features like copy-on-write and more

Why NOT choose it

  • Compared to kernel-space solution we need lots of useless context switches which makes kernel-only solution clear speed-winner (well, actually I've made some tests and the hard-drives seem to be the bottleneck so the speed is fine, too)
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