From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB048C433E0 for ; Wed, 29 Jul 2020 05:51:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E015206D4 for ; Wed, 29 Jul 2020 05:51:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IBGaqRRB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726445AbgG2Fvs (ORCPT ); Wed, 29 Jul 2020 01:51:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726367AbgG2Fvr (ORCPT ); Wed, 29 Jul 2020 01:51:47 -0400 Received: from mail-io1-xd44.google.com (mail-io1-xd44.google.com [IPv6:2607:f8b0:4864:20::d44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3530C061794 for ; Tue, 28 Jul 2020 22:51:47 -0700 (PDT) Received: by mail-io1-xd44.google.com with SMTP id v6so8056240iow.11 for ; Tue, 28 Jul 2020 22:51:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=aGFrHmiFaG+4vJxCAa9nAFD+Ucgll0CQfR6hnOIOXZA=; b=IBGaqRRBtxYlzzkQ60L0B/HLl0eQ5TLdqS+5Sm4u24OOI2qb9NVq8PrR05tyT8NsS/ SHtiP/ykOMe3G48tJ7Mcsz3V+pm9rqlHDRE2cEI+UNmQ3oFOUCF22KlF6diJRWhk5x0n HXicI5U+oIFQcrmbhR5NZPhAJBWQLDCqbEIinVkwWTh0CD1J0IIE3Yk7OQ6gkjLA4aI1 +STgp6Q8a9QrKNmoCDhu1g0G4Cvd6U7TBBOqy4mkbJgGyoTQt5Q3BeiVkoMPgUgVC+h5 QRg8IwlZu7J2nt2mS6OTkh46KbH0vVYwWpKd7IqmRmezVCMI1J5fQouFc1ufItEmb+ez ngPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=aGFrHmiFaG+4vJxCAa9nAFD+Ucgll0CQfR6hnOIOXZA=; b=R4HUdik1BaH+EqDYJk7BQP7AHDXPEXAyCl5TVN6M8xyVWG5stTMwqOUO0APiB+o1x4 lpFb5tVjWNO9ufeWRZWpEgpl35FeniN9c/jyUvNUkTN4R47doCNdp8A6pJGS++cj837n guf2yEif5DfuQUeo+1ocZzUdGCyt2sHzuybLEkDOz7iqaR74vteN8zW7JQtr5PSAdVcb qZy5iX8NcVgvhF6w4AMFB/kEzGVF1PWF1rUzO3N+m9K8myDc7v36CDz82Nhg6rQzOtQs 1tN/iBZSDZAGuP5OXwzHCucIIDqRtQLs80VQpKS85lUFRyzfbUyl/tzC0Iax9iWVSf+A tseA== X-Gm-Message-State: AOAM533bbbB96AOePQgEzgT5IpBWJhn0X///c6F8Bab5Xx1L2aiU64hG 5ePahOAu2cG5Ltx41pE7nOqRSAn97a+ddA9o93I= X-Google-Smtp-Source: ABdhPJwqY3U1nyow2ah5erfX+OVHzALXaRfvsJuCKH2x2gJ1VEPvzjE3EM5EipfennEqIbKXPGtW1k1qXq3f6D+4Wgc= X-Received: by 2002:a6b:ba03:: with SMTP id k3mr25568718iof.72.1596001905800; Tue, 28 Jul 2020 22:51:45 -0700 (PDT) MIME-Version: 1.0 References: <1750303.WlVpaa6DS8.ref@nerdopolis> <1750303.WlVpaa6DS8@nerdopolis> <7866875.n4lXpxAzLT@nerdopolis> In-Reply-To: <7866875.n4lXpxAzLT@nerdopolis> From: Amir Goldstein Date: Wed, 29 Jul 2020 08:51:34 +0300 Message-ID: Subject: Re: Incorrect Overlayfs documentation To: nerdopolis Cc: overlayfs , Miklos Szeredi Content-Type: text/plain; charset="UTF-8" Sender: linux-unionfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-unionfs@vger.kernel.org On Thu, Jul 23, 2020 at 6:51 AM nerdopolis wrote: > > On Thursday, July 16, 2020 1:03:52 PM EDT Amir Goldstein wrote: > > On Thu, Jul 16, 2020 at 6:09 AM nerdopolis > > wrote: > > > > > > Hi > > > > > > A while back I opened up https://bugzilla.kernel.org/show_bug.cgi?id=195113 describing a documentation problem in > > > https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt but for whatever reason, it hasn't been seen. > > > > > > > > > The problem is that it says "The lower filesystem can be any filesystem supported by Linux" > > > however, this is not the case, as Linux supports vfat, and vfat doesn't work as a lower filesystem > > > > > > So there's no way to tell what filesystems are applicable for an overlay lowerfs, > > > and I don't think any existing userspace utilities can detect it. > > > > > > Could it be possible for the .txt file to be updated? > > > > > > > The way it works usually in this project is you can submit a patch to fix the > > problem: > > https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html > > > > But if you don't want to go through that process, you can offer a text to > > fix documentation. > > > > But I myself cannot offer anything better than: > > "The lower filesystem can be one of many filesystem supported by Linux". > > > > I don't think that we want to start listing the supported filesystems in > > documentation. > > > > FWIW the description of upper fs isn't uptodate either. > > > > Thanks, > > Amir. > > > > > Hi. > > Yeah, that process might be cumbersome. I guess what you have is good. > Maybe "A wide range of filesystems supported by Linux can be the lower > filesystem, however, not all filesystems that are mountable by Linux have the > features needed for OverlayFS to work" > ? > That sounds good to me. CC the maintainer in case he wants to apply this documentation "patch" himself. Thanks, Amir.