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

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Message-ID: <20090529155046.GH11363@kernel.dk>
Date:	Fri, 29 May 2009 17:50:46 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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 Fri, May 29 2009, Artem Bityutskiy wrote:
> 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.
>
> I see, thanks. The below UBIFS patch fixes the issue. I'll
> push it to ubifs-2.6.git tree, unless there are objections.
>
> From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> Subject: [PATCH] UBIFS: do not forget to register BDI device
>
> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> ---
> fs/ubifs/super.c |    3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
> index 2349e2c..d1ac967 100644
> --- a/fs/ubifs/super.c
> +++ b/fs/ubifs/super.c
> @@ -1929,6 +1929,9 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
> 	err  = bdi_init(&c->bdi);
> 	if (err)
> 		goto out_close;
> +	err = bdi_register(&c->bdi, NULL, "ubifs");
> +	if (err)
> +		goto out_close;

Not quite right, you need to call bdi_destroy() if you have done the
init.

I committed this one this morning:

http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=570a2fe1df85741988ad0ca22aa406744436e281

But feel free to commit/submit to the ubifs tree directly, then it'll
disappear from my tree once it is merged.

-- 
Jens Axboe

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