From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-f47.google.com ([209.85.217.47]:40752 "EHLO mail-vs1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726246AbfFAUB6 (ORCPT ); Sat, 1 Jun 2019 16:01:58 -0400 Received: by mail-vs1-f47.google.com with SMTP id c24so8906981vsp.7 for ; Sat, 01 Jun 2019 13:01:57 -0700 (PDT) MIME-Version: 1.0 From: Marco Nelissen Date: Sat, 1 Jun 2019 13:01:45 -0700 Message-ID: Subject: which lower filesystems are actually supported? Content-Type: text/plain; charset="UTF-8" Sender: linux-unionfs-owner@vger.kernel.org To: linux-unionfs@vger.kernel.org List-ID: According to the documentation, "The lower filesystem can be any filesystem supported by Linux", however this appears to not actually be the case, since using a vfat filesystem results in the mount command printing "mount: wrong fs type, bad option, bad superblock on overlay, missing codepage or helper program, or other error", with dmesg saying "overlayfs: filesystem on '/boot' not supported". (that's from ovl_mount_dir_noesc(), when ovl_dentry_weird() returns nonzero) Should vfat be supported, or is the documentation wrong? If the documentation is wrong, what other filesystems are (not) supported?