• Contact: tech-kern
• Duration estimate: 8-12 months

Remove the residual geometry code and datastructures from FFS (keep some kind of allocation groups but without most of what cylinder groups now have) and replace blocks and fragments with extents, yielding a much simpler filesystem well suited for modern disks. The result would be useful to many operating systems beyond just NetBSD, since UFS/FFS is used in so many different kernels.