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Date:	Tue, 9 Oct 2012 12:25:04 +0200
From:	David Sterba <>
To:	Miao Xie <>,
	Linux Kernel <>,
	Linux Btrfs <>,
	Linux Fsdevel <>,
	Linux Ext4 <>,
	viro <>,
	Christoph Hellwig <>,
	Kamal Mostafa <>
Subject: Re: [PATCH 1/2 RESEND] vfs: re-implement
 writeback_inodes_sb(_nr)_if_idle() and rename them

On Wed, Sep 05, 2012 at 05:54:04PM +0200, David Sterba wrote:
> > Many users who use btrfs met the deadlock problem caused by writeback_inodes_sb(_nr)_if_idle(),
> > so I send this patch again and hope it will be received as soon as possible if nobody objects.
> Yes please, this makes testing of the 'autodefrag' mount option hard as
> the deadlock occurs frequently upon umount (when there's a background
> snapshot cleanup in progress).

We have another report of the deadlock and it's without 'autodefrag'
mount, triggered by snapshot cleaning under low space conditions.

I have added the patch to SLES kernel some time ago and haven't observed
the deadlock since.

Please queue the patch for 3.7, we cannot fix it locally within btrfs.

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