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

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Message-ID: <m3hcwzhgvm.fsf@bzzz.home.net>
Date:	Thu, 16 Nov 2006 12:37:17 +0300
From:	Alex Tomas <alex@...sterfs.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	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

>>>>> 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?

thanks, Alex

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