NFS: Clean up - simplify the switch to read/write-through-MDS

Use nfs_pageio_reset_read_mds and nfs_pageio_reset_write_mds instead of
completely reinitialising the struct nfs_pageio_descriptor.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index cabe5f6..9fba527 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1051,19 +1051,19 @@
 	.pg_doio = nfs_generic_pg_writepages,
 };
 
-void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
+static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
 				  struct inode *inode, int ioflags)
 {
 	nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops,
 				NFS_SERVER(inode)->wsize, ioflags);
 }
-EXPORT_SYMBOL_GPL(nfs_pageio_init_write_mds);
 
 void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
 {
 	pgio->pg_ops = &nfs_pageio_write_ops;
 	pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
 }
+EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
 
 static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 				  struct inode *inode, int ioflags)