NFS: Create a common pgio_rpc_prepare function

The read and write paths do exactly the same thing for the rpc_prepare
rpc_op.  This patch combines them together into a single function.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index c54829e..c171ce1 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -599,7 +599,7 @@
 	msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 }
 
-static int nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_pgio_data *data)
+static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task, struct nfs_pgio_data *data)
 {
 	rpc_call_start(task);
 	return 0;
@@ -621,12 +621,6 @@
 	msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 }
 
-static int nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_pgio_data *data)
-{
-	rpc_call_start(task);
-	return 0;
-}
-
 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 {
 	BUG();
@@ -734,11 +728,10 @@
 	.fsinfo		= nfs_proc_fsinfo,
 	.pathconf	= nfs_proc_pathconf,
 	.decode_dirent	= nfs2_decode_dirent,
+	.pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
 	.read_setup	= nfs_proc_read_setup,
-	.read_rpc_prepare = nfs_proc_read_rpc_prepare,
 	.read_done	= nfs_read_done,
 	.write_setup	= nfs_proc_write_setup,
-	.write_rpc_prepare = nfs_proc_write_rpc_prepare,
 	.write_done	= nfs_write_done,
 	.commit_setup	= nfs_proc_commit_setup,
 	.commit_rpc_prepare = nfs_proc_commit_rpc_prepare,