Coda is an advanced network file system, similar to NFS in that it
enables you to mount file systems of a remote server and access them
with regular Unix commands as if they were sitting on your hard
disk. Coda has several advantages over NFS: support for
disconnected operation (e.g. for laptops), read/write server
replication, security model for authentication and encryption,
persistent client caches and write back caching.

If you say Y here, your Linux box will be able to act as a Coda
*client*. You will need user level code as well, both for the
client and server. Servers are currently user level, i.e. they need
no kernel support. Please read
Documentation/filesystems/coda.txt and check out the Coda
home page <http://www.coda.cs.cmu.edu/>.

To compile the coda client support as a module, choose M here: the
module will be called coda.

source code:

fs/coda/