To: Andrew Morton <akpm@osdl.org>
Cc: cmm@us.ibm.com, Hugh Dickins <hugh@veritas.com>,
       Mel Gorman <mel@skynet.ie>, "Martin J. Bligh" <mbligh@mbligh.org>,
       linux-kernel@vger.kernel.org,
       "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: Boot failure with ext2 and initrds
References: <20061114014125.dd315fff.akpm@osdl.org>
	<20061114184919.GA16020@skynet.ie>
	<Pine.LNX.4.64.0611141858210.11956@blonde.wat.veritas.com>
	<20061114113120.d4c22b02.akpm@osdl.org>
	<Pine.LNX.4.64.0611142111380.19259@blonde.wat.veritas.com>
	<Pine.LNX.4.64.0611151404260.11929@blonde.wat.veritas.com>
	<20061115214534.72e6f2e8.akpm@osdl.org> <455C0B6F.7000201@us.ibm.com>
	<20061115232228.afaf42f2.akpm@osdl.org>
	<1163666960.4310.40.camel@localhost.localdomain>
	<20061116011351.1401a00f.akpm@osdl.org>
From: Alex Tomas <alex@clusterfs.com>
Organization: CFS
Date: Thu, 16 Nov 2006 12:37:17 +0300
In-Reply-To: <20061116011351.1401a00f.akpm@osdl.org> (Andrew Morton's message of "Thu, 16 Nov 2006 01:13:51 -0800")
Message-ID: <m3hcwzhgvm.fsf@bzzz.home.net>
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>>>>> 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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