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

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Date:	Thu, 19 Aug 2010 04:38:39 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	device-mapper development <dm-devel@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, Vladislav Bolkhovitin <vst@...b.net>,
	linux-kernel@...r.kernel.org, Bryan Mesich <bryan.mesich@...u.edu>,
	Jens Axboe <jens.axboe@...nel.dk>, linux-raid@...r.kernel.org,
	Jeff Moyer <jmoyer@...hat.com>,
	scst-devel@...ts.sourceforge.net, stable@...nel.org
Subject: Re: [dm-devel] [PATCH RESEND 1/2 block#for-linus] bio, fs: update
 READA and SWRITE to match the corresponding BIO_RW_* bits

On Fri, Aug 06, 2010 at 12:04:43PM +0800, Tao Ma wrote:
> >>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.
> If only this patch goes into stable, do we need to change RWA_MASK
> in this patch also(I have seen you change it the 2/2)?
> 
> -#define RWA_MASK        2
> +#define RWA_MASK        16

I think RW_MASK and RWA_MASK should simply go away, they don't server
any use over just masking the correct REQ_* flags.

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