linux-ext4 - Re: Boot failure with ext2 and initrds

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Date:	Thu, 16 Nov 2006 01:49:20 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Alex Tomas <alex@...sterfs.com>, cmm@...ibm.com,
	Hugh Dickins <hugh@...itas.com>, Mel Gorman <mel@...net.ie>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Boot failure with ext2 and initrds

On Thu, 16 Nov 2006 01:48:09 -0800
Andrew Morton <akpm@...l.org> wrote:

> On Thu, 16 Nov 2006 12:37:17 +0300
> Alex Tomas <alex@...sterfs.com> wrote:
> 
> > >>>>> Andrew Morton (AM) writes:
> > 
> >  AM> What lock protects the fields in struct ext[234]_reserve_window from being
> >  AM> concurrently modified by two CPUs?  None, it seems.  Ditto
> >  AM> ext[234]_reserve_window_node.  i_mutex will cover it for write(), but not
> >  AM> for pageout over a file hole.  If we end up with a zero- or negative-sized
> >  AM> window then odd things might happen.
> > 
> > truncate_mutex?
> > 
> 
> yes.  hmm.

by which I mean "ext2 doesn't have a truncate_mutex".
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