From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH 13/14] fs,btrfs: Allow kswapd to writeback pages
Date: Wed, 30 Jun 2010 09:05:04 -0400
Message-ID: <20100630130504.GT1993@think>
References: <1277811288-5195-1-git-send-email-mel@csn.ul.ie>
 <1277811288-5195-14-git-send-email-mel@csn.ul.ie>
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Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-mm@kvack.org, Dave Chinner <david@fromorbit.com>,
        Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Christoph Hellwig <hch@infradead.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
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On Tue, Jun 29, 2010 at 12:34:47PM +0100, Mel Gorman wrote:
> As only kswapd and memcg are writing back pages, there should be no
> danger of overflowing the stack. Allow the writing back of dirty pages
> in btrfs from the VM.
> 
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>

Signed-off-by: Chris Mason <chris.mason@oracle.com>

But, this is only the metadata writepage.  fs/btrfs/inode.c has another
one for data pages.  (just look for PF_MEMALLOC).

-chris

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