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Date:   Fri, 20 Nov 2020 12:58:44 +0100
From:   Christian Brauner <>
To:     Christoph Hellwig <>
Cc:     "Darrick J. Wong" <>,
        Alexander Viro <>,,
        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 <>,
        Jann Horn <>,
        Seth Forshee <>,
        St??phane Graber <>,
        Aleksa Sarai <>,
        Lennart Poettering <>,
        "Eric W. Biederman" <>,,
        Phil Estes <>, Serge Hallyn <>,
        Kees Cook <>,
        Todd Kjos <>, Jonathan Corbet <>,,,,,,,
Subject: Re: [PATCH v2 00/39] fs: idmapped mounts

On Fri, Nov 20, 2020 at 09:12:47AM +0000, Christoph Hellwig wrote:
> On Fri, Nov 20, 2020 at 10:10:44AM +0100, Christian Brauner wrote:
> > Maybe you didn't see this or you're referring to xfstests but this
> > series contains a >=4000 lines long test-suite that validates all core
> > features with and without idmapped mounts. It's the last patch in this
> > version of the series and it's located in:
> > tools/testing/selftests/idmap_mounts.
> > 
> > Everytime a filesystem is added this test-suite will be updated. We
> > would perfer if this test would be shipped with the kernel itself and
> > not in a separate test-suite such as xfstests. But we're happy to add
> > patches for the latter at some point too.
> selftests is a complete pain to use, partialy because it is not
> integrated with the framework we file system developers use (xfstests)
> and partially because having the test suite in the kernel tree really
> breaks a lot of the typical use cases.  So I think we'll need to wire
> this up in the proper place instead.

Ok, I think I can basically port the test-suite at the end of this patch
series so that it can be carried in xfstests/src/idmapped_mounts.c

I'll start doing that now.
It would make it a bit easier if we could carry it as a single file for


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