linux-ext4 - Re: [PATCH v2 00/39] fs: idmapped mounts

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Message-ID: <20201118094513.itchk5nx75er6wh6@wittgenstein>
Date:   Wed, 18 Nov 2020 10:45:13 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Jonathan Corbet <corbet@....net>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fsdevel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Geoffrey Thomas <geofft@...reload.com>,
        Mrunal Patel <mpatel@...hat.com>,
        Josh Triplett <josh@...htriplett.org>,
        Andy Lutomirski <luto@...nel.org>,
        Theodore Tso <tytso@....edu>, Alban Crequy <alban@...volk.io>,
        Tycho Andersen <tycho@...ho.ws>,
        David Howells <dhowells@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jann Horn <jannh@...gle.com>,
        Seth Forshee <seth.forshee@...onical.com>,
        Stéphane Graber <stgraber@...ntu.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Lennart Poettering <lennart@...ttering.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, smbarber@...omium.org,
        Phil Estes <estesp@...il.com>, Serge Hallyn <serge@...lyn.com>,
        Kees Cook <keescook@...omium.org>,
        Todd Kjos <tkjos@...gle.com>,
        containers@...ts.linux-foundation.org,
        linux-security-module@...r.kernel.org, linux-api@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-audit@...hat.com,
        linux-integrity@...r.kernel.org, selinux@...r.kernel.org
Subject: Re: [PATCH v2 00/39] fs: idmapped mounts

On Tue, Nov 17, 2020 at 04:54:33PM -0700, Jonathan Corbet wrote:
> On Sun, 15 Nov 2020 11:36:39 +0100
> Christian Brauner <christian.brauner@...ntu.com> wrote:
> 
> One quick question...
> 
> > I have written a simple tool available at
> > https://github.com/brauner/mount-idmapped that allows to create idmapped
> > mounts so people can play with this patch series.
> 
> I spent a while looking at that tool.  When actually setting the namespace
> for the mapping, it uses MOUNT_ATTR_SHIFT rather than MOUNT_ATTR_IDMAP.
> The value is the same, so I expect it works...:)  But did that perhaps not
> get updated to reflect a name change?

Yep, that was my mistake. I'll fix it up in the repo for that tool now
and maybe improve it a little too! :)

Christian