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

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Message-ID: <20170412054828.GA20561@infradead.org>
Date:   Tue, 11 Apr 2017 22:48:28 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Richard Weinberger <richard@....at>
Cc:     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 10:43:26PM +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.