linux-kernel - Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

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Message-ID: <20090528222718.GE11363@kernel.dk>
Date:	Fri, 29 May 2009 00:27:18 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Artem Bityutskiy <dedekind1@...il.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, chris.mason@...cle.com, david@...morbit.com,
	hch@...radead.org, akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com, richard@....demon.co.uk,
	damien.wyart@...e.fr
Subject: Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

On Thu, May 28 2009, Peter Zijlstra wrote:
> On Thu, 2009-05-28 at 17:19 +0300, Artem Bityutskiy wrote:
> > Artem Bityutskiy wrote:
> > > question is - should it? 'bdi_register()' a block device,
> > > but we do not have one.
> > 
> > Sorry, wanted to say: 'bdi_register()' registers a block
> > device.
> 
> BDI stands for backing device info and is not related to block devices
> other than that block devices can also be (ok, always are) backing
> devices.
> 
> If you want to do writeback, you need a backing device to write to. The
> BDI is the device abstraction for writeback.

Precisely. Apparently ubifs doesn't register its backing device. I fixed
a similar issue in btrfs, I'll do an audit of the file systems and fix
that up.

-- 
Jens Axboe

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