linux-kernel - Re: [dm-devel] [PATCH] deadlock with suspend and quotas

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Message-ID: <Pine.LNX.4.64.1111301134450.5759@hs20-bc2-1.build.redhat.com>
Date:	Wed, 30 Nov 2011 11:36:11 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Alasdair G Kergon <agk@...hat.com>
cc:	Jan Kara <jack@...e.cz>, esandeen@...hat.com,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	linux-fsdevel@...r.kernel.org,
	Christopher Chaltain <christopher.chaltain@...onical.com>,
	Valerie Aurora <val@...consulting.com>
Subject: Re: [dm-devel] [PATCH] deadlock with suspend and quotas

On Wed, 30 Nov 2011, Alasdair G Kergon wrote:

> On Wed, Nov 30, 2011 at 01:33:32PM +0000, Alasdair G Kergon wrote:
> > Have I missed something in this
> > reasoning, Mikulas?
>  
> Ah - counter-example: mmap?
> So sync might indeed be required to block on the filesystem iff there
> are newly-dirtied pages.
> 
> Alasdair

On non-journaled filesystem, both write and mmap can create dirty pages 
when suspended.

On ext4 I actually tested mmap, but it blocks any writes to mmaped pages 
while suspended.

Mikulas
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