switch {__,}blockdev_direct_IO() to iov_iter

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 723affe..b8003e8 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3090,8 +3090,8 @@
 	size_t count = iov_iter_count(iter);
 	ssize_t ret;
 
-	ret = blockdev_direct_IO(rw, iocb, inode, iter->iov, offset,
-				 iter->nr_segs, reiserfs_get_blocks_direct_io);
+	ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
+				 reiserfs_get_blocks_direct_io);
 
 	/*
 	 * In case of error extending write may have instantiated a few