From: "William A.(Andy) Adamson" <andros@citi.umich.edu>


this open share state patch creates all the structures and hash tables needed
to create and destroy share state on OPEN.

a struct nfs4_stateowner is introduced. this is currently only used for share
state, but will also be used as an anchor for byte-range lock state. e.g. it
will be either an (open)stateowner or a (lock)stateower.

a struct nfs4_stateid is introduced with holds stateid info for openfiles per
(open)stateowner. this struct will also hold byte-range lock info for
(lock)stateowners.

ownerstr_hashtbl[] holds nfs4_stateowners hashed by the nfs4_open owner and
clientid, and is used to lookup nfs4_stateowners on OPEN.

a struct nfs4_file is introduced which holds info on open files with state.

file_hashtbl[] holds nfs4_files, and is used to find a file in order to search
for conflicting share locks on OPEN. delegation info will hang off the
nf4_file struct.

i moved nfsd4_process_open1() into nfs4state.c, and added nfs4_process_open2()
there as well

i've left lease management, state reclaim, and the special replay management
on sequenceid mutating operations like OPEN for subsequent patches.