Chunkfs is a new file system architecture that divides file systems up
into chunks that are invidually and incrementally checked and
repaired, with only occasional references to metadata in other chunks.
Chunkfs is one example of repair-driven
file system design, the idea that file systems should be designed
from the ground up to be not only fast and efficient during "normal"
operation, but also during file system check and repair.
Chunkfs was prototyped and measured several times. The conclusion is
that the idea works, you can easily reduce file system repair time by
a couple of orders of magnitude, and you need to design it into your
system from the start. I don't plan any further work on chunkfs given
that btrfs was
designed with check and repair in mind from the beginning and is
clearly going to be the next major Linux file system.
Useful documents and code: