linux-kernel - Re: new barrier warnings in 2.6.29-rc1

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Date:	Tue, 13 Jan 2009 12:23:01 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Hellwig <hch@....de>
CC:	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: new barrier warnings in 2.6.29-rc1

(cc'ing Jens)
Hello,

Christoph Hellwig wrote:
> Whever a filesystem submits a bio with the barrier flag set but
> the underlying hardware doesn't support it we now get errors in
> the form of:
> 
> [ 3046.442629] end_request: I/O error, dev vdb, sector 0
> 
> since commit a7384677b2f4cd40948fd7ce024ba5e1821444ba which removed
> the early check on the queue capabilities in __make_request.  I
> think this message is pretty annoying and confusing for the user
> as the filesystems already have more descriptive warnings, e.g. for
> XFS:
> 
> [ 3046.455478] Filesystem "vdb": Disabling barriers, trial barrier write failed

I think the right thing to do is setting REQ_QUIET on the trial
barrier request.

Thanks.

-- 
tejun
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