pnfs-submit: forgetful client v2

This set of patches (2.6.35-rc1) includes a first attempt to implement the forgetful client model for the pNFS client. The model is explained is patch 7.
It also includes some minor cleanups in the layout management code that help to improve the maintanability of the current code.

Passed cthon tests against the pyNFS server, and against a modified version of pyNFS server that randomly issues layout recalls after opens.

Alexandros Batsakis (8):
pnfs-submit: clean struct nfs_inode
pnfs-submit: clean locking infrastructure
pnfs-submit: remove lgetcount, lretcount (outstanding
LAYOUTGETs/LAYOUTRETUNs)
pnfs-submit: change stateid to be a union
pnfs-submit: request whole file layouts only
pnfs-submit: change layouts list to be similar to the other state
list management
pnfs-submit: forgetful client model
pnfs-submit: support for cb_recall_any (layouts)

 fs/nfs/callback.h         |    7 +
 fs/nfs/callback_proc.c    |  231 +++++++++++++++++++++++++++++---------
 fs/nfs/callback_xdr.c     |    2 +-
 fs/nfs/client.c           |    2 +-
 fs/nfs/delegation.c       |   19 ++--
 fs/nfs/inode.c            |   16 ++-
 fs/nfs/nfs4_fs.h          |    1 +
 fs/nfs/nfs4proc.c         |   46 +++++---
 fs/nfs/nfs4state.c        |    4 +-
 fs/nfs/nfs4xdr.c          |   38 ++++---
 fs/nfs/pnfs.c             |  276 +++++++++++++++++++++------------------------
 fs/nfs/pnfs.h             |    3 +-
 fs/nfsd/nfs4callback.c    |    1 -
 include/linux/nfs4.h      |   16 +++-
 include/linux/nfs4_pnfs.h |    2 +-
 include/linux/nfs_fs.h    |   28 ++---
 include/linux/nfs_fs_sb.h |    2 +-
 17 files changed, 417 insertions(+), 277 deletions(-)