Files :
      1. server.c : service procedure servicing the nfs rpc procedures. 
      2. file_handle.c : file handle cache routines.
      3. getattr.c : supporting getattr routines.
      4. setattr.c : supporting setattr routines.
      5. nfs_prot_xdr.c : supporting server xdr routines.
      6. nfs_prot_svc.c : supporting server stub routines.
      7. nfsmounted.c : checks whether file is nfs mounted or not.
      8. xstrdup.c : string copy routine.
      9. fsusage.c : return space usage of file system. 

note: essentially interacts with the kernel-space client. 

note: adding final modifications to MKNOD and other services.

