linux-kernel - Re: [PATCH v2 3/3] fs: ubifs: set s

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Message-ID: <20170412071551.i36yj3lzilgtntdy@pengutronix.de>
Date:   Wed, 12 Apr 2017 09:15:51 +0200
From:   Oleksij Rempel <ore@...gutronix.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Richard Weinberger <richard@....at>,
        Oleksij Rempel <o.rempel@...gutronix.de>, dedekind1@...il.com,
        adrian.hunter@...el.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: Re: [PATCH v2 3/3] fs: ubifs: set s_uuid in super block

On Tue, Apr 11, 2017 at 10:48:28PM -0700, Christoph Hellwig wrote:
> On Tue, Apr 11, 2017 at 10:43:26PM +0200, Richard Weinberger wrote:
> > Artem, do you remember why UBIFS didn't set s_uuid in first place?
> 
> It's an extremely odd field - only a hand full of file systems set it
> (e.g. XFS doesn't, although according to Mimi IMA supports XFS), and
> it's never even used outside of the IMA/EVM code.
> 
> We really need a feature flag that this field is valid that IMA can
> check before adding more support for it.

It seems to be used by mm/cleancache.c
void __cleancache_init_shared_fs()

but this affects only ocfs2.

So, if some flag should be implemented, who should do it? :)
If me, what flag should be created?

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