[PATCH] give NFS client a "set_page_dirty" address space op.

Description:
  The default set_page_dirty address space op is too heavyweight for NFS,
  which doesn't use buffers.

fs/nfs/file.c

@@ -168,6 +168,7 @@ static int nfs_commit_write(struct file *file, struct page *page, unsigned offse
 struct address_space_operations nfs_file_aops = {
 	.readpage = nfs_readpage,
 	.readpages = nfs_readpages,
+	.set_page_dirty = __set_page_dirty_nobuffers,
 	.writepage = nfs_writepage,
 	.writepages = nfs_writepages,
 	.prepare_write = nfs_prepare_write,