linux-kernel - RE: Cleancache and shared filesystems

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Message-ID: <790b3e0b-14b6-44da-9f4c-a4315b58e2c5@default>
Date:	Tue, 31 May 2011 07:51:36 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Joel Becker <jlbec@...lplan.org>,
	Steven Whitehouse <swhiteho@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Sunil Mushran <sunil.mushran@...cle.com>
Subject: RE: Cleancache and shared filesystems

> From: Joel Becker [mailto:jlbec@...lplan.org]
> Sent: Friday, May 27, 2011 5:34 PM
> To: Steven Whitehouse
> Cc: Dan Magenheimer; linux-kernel@...r.kernel.org; Sunil Mushran
> Subject: Re: Cleancache and shared filesystems
> 
> On Fri, May 27, 2011 at 05:19:39PM +0100, Steven Whitehouse wrote:
> > +	if (ls->ls_ops == &gfs2_dlm_ops) {
> > +		if (gfs2_uuid_valid(sb->s_uuid))
> > +			cleancache_init_shared_fs(sb->s_uuid, sb);
> > +	} else {
> > +		cleancache_init_fs(sb);
> > +	}
> 
> Hey Dan,
> 	Steven makes a good point here.  ocfs2 could also take advantage
> of local filesystem behavior when running in local mode.

Hi Joel --

I guess the semantics need to be more clearly defined
(or perhaps changed if the shared-fs community wants),
but if cleancache_init_shared_fs is called only by
a single node, cleancache still enables all the same
functionality** as cleancache_init_fs. 

I'm not sure I fully understand the semantics of
local mode though, so please clarify if you think
I am wrong or misunderstanding your point.

Thanks,
Dan

---
Thanks... for the memory!
I really could use more / my throughput's on the floor
The balloon is flat / my swap disk's fat / I've OOM's in store
Overcommitted so much
(with apologies to Bob Hope)
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