HAMMER FS specific wishlist: * cp doesn't duplicate a file, instead it will reuse the existing ondisk data. * transparent per-PFS compression * 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