ocfs2_file_aio_write(): switch to generic_perform_write()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/ocfs2/file.c

@@ -2381,9 +2381,12 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
 			goto out_dio;
 		}
 	} else {
+		struct iov_iter from;
+		iov_iter_init(&from, iov, nr_segs, count, 0);
 		current->backing_dev_info = file->f_mapping->backing_dev_info;
-		written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
-						      count, 0);
+		written = generic_perform_write(file, &from, *ppos);
+		if (likely(written >= 0))
+			iocb->ki_pos = *ppos + written;
 		current->backing_dev_info = NULL;
 	}