HAMMER FS specific wishlist:

* <tt>cp</tt> doesn't duplicate a file, instead it will reuse the existing ondisk data.

* transparent per-PFS compression. This could be performed as a background task.
  In case a file is compressed, it would be nice if it would be possible to access the compressed data, 
  for example to send out web-pages compressed over the wire without having to decompress and recompress
  again.

* filesystem growing and shrinking (growing is partially implemented, but needs some help).

* RAID-features: e.g. keep multiple copies of (certain) files on disk (per-PFS setting?). 
  This could also be performed as a background task. In case multiple copies exists, 
  the filesystem would try one after the other in case of a CRC failure.

* De-duplication of data: Blocks with same content are stored only once. Could also be performed as
  a background task.

* Clustering

See also: [Ongoing work](http://www.dragonflybsd.org/presentations/nycbsdcon08/img14.png)