linux-ext4 - Re: [PATCH v3 33/38] ext4: support idmapped mounts

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Message-ID: <CAHap4zvDuSpZzeyZPc61mQURu_0oGKjkiROohYXkAFYyD85Vvw@mail.gmail.com>
Date:   Mon, 30 Nov 2020 17:52:04 -0500
From:   Mauricio Vásquez Bernal <mauricio@...volk.io>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fsdevel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        containers@...ts.linux-foundation.org,
        Christoph Hellwig <hch@....de>,
        Tycho Andersen <tycho@...ho.ws>,
        Paul Moore <paul@...l-moore.com>,
        Jonathan Corbet <corbet@....net>, smbarber@...omium.org,
        linux-ext4@...r.kernel.org, Mrunal Patel <mpatel@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, selinux@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Seth Forshee <seth.forshee@...onical.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Lennart Poettering <lennart@...ttering.net>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Geoffrey Thomas <geofft@...reload.com>,
        David Howells <dhowells@...hat.com>,
        John Johansen <john.johansen@...onical.com>,
        Theodore Tso <tytso@....edu>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        fstests@...r.kernel.org, linux-security-module@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-api@...r.kernel.org,
        Casey Schaufler <casey@...aufler-ca.com>,
        Alban Crequy <alban@...volk.io>,
        linux-integrity@...r.kernel.org, Todd Kjos <tkjos@...gle.com>
Subject: Re: [PATCH v3 33/38] ext4: support idmapped mounts

> diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
> index 619dd35ddd48..5918c05cfe5b 100644
> --- a/fs/ext4/Kconfig
> +++ b/fs/ext4/Kconfig
> @@ -118,3 +118,12 @@ config EXT4_KUNIT_TESTS
>           to the KUnit documentation in Documentation/dev-tools/kunit/.
>
>           If unsure, say N.
> +
> +config EXT4_IDMAP_MOUNTS
> +       bool "Support vfs idmapped mounts in ext4"
> +       depends on EXT4_FS
> +       default n
> +       help
> +         The vfs allows to expose a filesystem at different mountpoints with
> +         differnet idmappings. Allow ext4 to be exposed through idmapped

s/differnet/different/g