linux-kernel - Re: [PATCH] Make XFS workqueues nonfreezable

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Date:	Thu, 1 Mar 2007 01:25:54 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Oleg Nesterov <oleg@...sign.ru>,
	vatsa@...ibm.com, Gautham R Shenoy <ego@...ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>, David Chinner <dgc@....com>,
	Nigel Cunningham <ncunningham@...uxmail.org>
Subject: Re: [PATCH] Make XFS workqueues nonfreezable

On Thu, 1 Mar 2007 10:15:21 +0100 Pavel Machek <pavel@....cz> wrote:

> > > -	xfslogd_workqueue = create_freezeable_workqueue("xfslogd");
> > > +	xfslogd_workqueue = create_workqueue("xfslogd");
> > >  	if (!xfslogd_workqueue)
> > >  		goto out_free_buf_zone;
> > >  
> > > -	xfsdatad_workqueue = create_freezeable_workqueue("xfsdatad");
> > > +	xfsdatad_workqueue = create_workqueue("xfsdatad");
> > >  	if (!xfsdatad_workqueue)
> > >  		goto out_destroy_xfslogd_workqueue;
> > >  
> > 
> > Won't this break suspend+XFS?
> > 
> > If so, and given that nobody seems to be reporting this deadlock, perhaps
> > we'd be better off leaving things as-is for the while?
> 
> Worst case is not breaking suspend+XFS, worst case is XFS writing to
> disk after freeze(), leading to subtle fs corruption.
> 
> (But noone could reproduce corruption before, and I was told XFS will
> not do those writes these days).

hm, OK.   To avoid making a decision I sent the patch to David ;)
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