Currently the NFS client caches ACCESS information on a per uid basis
which fall apart when different process with different uid consistently
access the same directory. The end result being a storm of needless
ACCESS calls...

The attached patch used a hash table to store the nfs_access_entry
entires which cause the ACCESS request to only happen when the
attributes timeout.. The table is indexed by the addition of the
nfs_inode pointer and the cr_uid in the cred structure which should
spread things out nicely for some decent scalability (although the
locking scheme may need to be reworked a bit). The table has 256 entries
of struct list_head giving it a total size of 2k.

The patch is based on Trond's GIT tree...

Comments?

steved.