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

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Message-ID: <4A20011E.7020900@nokia.com>
Date:	Fri, 29 May 2009 18:37:02 +0300
From:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Jens Axboe <jens.axboe@...cle.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

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;
 
 	err = ubifs_parse_options(c, data, 0);
 	if (err)
-- 
1.6.0.6

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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