Remove rw from dax_{do_,}io()

And use iov_iter_rw() instead.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 3cbeb1b..14e8d17 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -861,8 +861,8 @@
 	ssize_t ret;
 
 	if (IS_DAX(inode))
-		ret = dax_do_io(rw, iocb, inode, iter, offset, ext2_get_block,
-				NULL, DIO_LOCKING);
+		ret = dax_do_io(iocb, inode, iter, offset, ext2_get_block, NULL,
+				DIO_LOCKING);
 	else
 		ret = blockdev_direct_IO(iocb, inode, iter, offset,
 					 ext2_get_block);