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Date:   Tue, 1 Dec 2020 12:13:20 +0100
From:   Christoph Hellwig <>
To:     Christian Brauner <>
Cc:     Christoph Hellwig <>,
        Alexander Viro <>,
        Christoph Hellwig <>,,
        John Johansen <>,
        James Morris <>,
        Mimi Zohar <>,
        Dmitry Kasatkin <>,
        Stephen Smalley <>,
        Casey Schaufler <>,
        Arnd Bergmann <>,
        Andreas Dilger <>,
        OGAWA Hirofumi <>,
        Geoffrey Thomas <>,
        Mrunal Patel <>,
        Josh Triplett <>,
        Andy Lutomirski <>,
        Theodore Tso <>, Alban Crequy <>,
        Tycho Andersen <>,
        David Howells <>,
        James Bottomley <>,
        Seth Forshee <>,
        St├ęphane Graber <>,
        Aleksa Sarai <>,
        Lennart Poettering <>,
        "Eric W. Biederman" <>,,
        Phil Estes <>, Serge Hallyn <>,
        Kees Cook <>,
        Todd Kjos <>, Paul Moore <>,
        Jonathan Corbet <>,,,,,,,
Subject: Re: [PATCH v3 33/38] ext4: support idmapped mounts

On Tue, Dec 01, 2020 at 12:02:19PM +0100, Christian Brauner wrote:
> On Tue, Dec 01, 2020 at 11:54:45AM +0100, Christoph Hellwig wrote:
> > What is the reason for the config option?  The only thing that it
> > controls is setting of a single flag.
> I wanted to be conservative and give users the option to disable this on
> their kernel. Would you prefer if I drop it?

I don't think adding an option per file system scales in any way.  If
there is some strong urge to disable the functionality (which I see no
reason for) we could add something like a global sysctl for all on-disk
file systems.

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