A real-world LFS

Log-structured File System is writing user data onto disk in the log structure.
Rather than common FS which updates changes in place, LFS tails all the user
changes at the end of the FS. Since it contains all the user changes of the user
data, it is possible for the user to roll back to any previous state of their
data.  
 
LFS has not been ported to Linux since it was first proposed and implemented in
BSD in 1990. Even BSD LFS is out-dated and only applied to BSD4.4. Only recently
is LFS rediscussed intensively due to the exponential increase of disk capacity
and the emergence of Solid-State Disk. A group in Nippon Telegraph and Telephone
Corp. has finally made LFS available to Linux world. They named it NilFS which is
ready to integrate into Linux kernel mainline. 
 
Considering LFS's easy recovery capability and data redundancy, it can be a good
candidate to be a Rapid Recovery System storage scheme. We would like to
customize the open source NilFS and take advantage of the LFS roll-back feature
to provide a finer granularity of recovery function for multple appliance. Also
we would like to add more access control schemes into LFS to secure the user
data. 
 
In this talk, I will first introduce the NilFS development status and LFS
recovery capability and then discuss more about the approaches of recovery scheme
and access control method.