Re: [PATCH v2 3/3] fs: ubifs: set s_uuid in super block

[Oleksij Rempel]

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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