linux-kernel - Re: [PATCH 1/2 block#for-2.6.36] bio, fs: update RWA_MASK, READA and SWRITE to match the corresponding BIO_RW

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Message-ID: <4C57FA57.2000601@kernel.dk>
Date:	Tue, 03 Aug 2010 13:15:35 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
CC:	stable@...nel.org, Vladislav Bolkhovitin <vst@...b.net>,
	Bryan Mesich <bryan.mesich@...u.edu>,
	scst-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, dm-devel@...hat.com,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 1/2 block#for-2.6.36] bio, fs: update RWA_MASK, READA
 and  SWRITE to match the corresponding BIO_RW_* bits

On 2010-08-03 11:53, Tejun Heo wrote:
> Commit a82afdf (block: use the same failfast bits for bio and request)
> moved BIO_RW_* bits around such that they match up with REQ_* bits.
> Unfortunately, fs.h hard coded RW_MASK, RWA_MASK, READ, WRITE, READA
> and SWRITE as 0, 1, 2 and 3, and expected them to match with BIO_RW_*
> bits.  READ/WRITE didn't change but BIO_RW_AHEAD was moved to bit 4
> instead of bit 1, breaking RWA_MASK, READA and SWRITE.
> 
> This patch updates RWA_MASK, READA and SWRITE such that they match the
> BIO_RW_* bits again.  A follow up patch will update the definitions to
> directly use BIO_RW_* bits so that this kind of breakage won't happen
> again.
> 
> Neil also spotted missing RWA_MASK conversion.
> 
> Stable: The offending commit a82afdf was released with v2.6.32, so
> this patch should be applied to all kernels since then but it must
> _NOT_ be applied to kernels earlier than that.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-and-bisected-by: Vladislav Bolkhovitin <vst@...b.net>
> Root-caused-by: Neil Brown <neilb@...e.de>
> Cc: Jens Axobe <axboe@...nel.dk>
           ^^^^^

(Too) common typo :-)

Anyway, applied to for-2.6.36, thanks a lot.

-- 
Jens Axboe

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