linux-kernel - Re: [PATCH block#for-2.6.36-post] block: fix incorrect bio/request flag conversion in md

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Message-ID: <4C6A9515.5060805@kernel.org>
Date:	Tue, 17 Aug 2010 15:56:37 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Hellwig <hch@....de>
CC:	Jens Axboe <axboe@...nel.dk>, lkml <linux-kernel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH block#for-2.6.36-post] block: fix incorrect bio/request
 flag conversion in md

Hello,

On 08/17/2010 03:56 PM, Christoph Hellwig wrote:
> On Mon, Aug 16, 2010 at 04:21:25PM +0200, Tejun Heo wrote:
>> Commit 74450be1 (block: unify flags for struct bio and struct request)
>> incorrectly converted @do_sync in md raid1 and raid10 make_requst()
>> functions.
>>
>> @do_sync is now supposed to carry the actual flag bit and directly
>> OR'd into bio->bi_rw but is still a bool and thus carries either 0 or
>> 1 instead of the actual flag bit.  This makes REQ_SYNC ignored on
>> writes and flips the direction of READ_SYNCs to WRITEs.
>>
>> Fix it by making @do_sync unsigned integers.
> 
> Yeah, you're the fourth person coming up with this independently.  Now
> all we need is to get one of the patches actually into Linus tree.

Ah, that's good to know.  It's not in mainline yet, so I guess we
should just wait for Jens to come back.

Thanks.

-- 
tejun
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