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

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Date:	Tue, 17 Aug 2010 15:56:38 +0200
From:	Christoph Hellwig <hch@....de>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>, lkml <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Neil Brown <neilb@...e.de>
Subject: Re: [PATCH block#for-2.6.36-post] block: fix incorrect bio/request flag conversion in md

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.

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