NFS: Create a common nfs_pgio_result_common function

Combining these functions will let me make a single nfs_rw_common_ops
struct (see the next patch).

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index da00a4d..01aa29c 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -57,6 +57,8 @@
 	struct nfs_rw_header *(*rw_alloc_header)(void);
 	void (*rw_free_header)(struct nfs_rw_header *);
 	void (*rw_release)(struct nfs_pgio_data *);
+	int  (*rw_done)(struct rpc_task *, struct nfs_pgio_data *, struct inode *);
+	void (*rw_result)(struct rpc_task *, struct nfs_pgio_data *);
 };
 
 struct nfs_pageio_descriptor {