My co-worker (and co-author) Ricardo Labiaga, just told me:
The NFS v4.1 client has been officially integrated into the upstream Linux kernel repository! It will be part of the Linux kernel version 2.6.31. We should see a release candidate before the end of this week. The Linux NFS v4.1 client implements the Sessions functionality, laying the foundation for pNFS to be submitted in the next few months.
This is a major milestone for the Linux NFS client development community (consisting of a group that includes developers like Ricardo from NetApp, EMC, IBM, Panasas, and the University of Michigan) and for NFSv4.1. Congratulations!
