linux-kernel - Re: [dm-devel] [PATCH 0/15] copy offload patches

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Message-ID: <20151211195509.GA2217@infradead.org>
Date:	Fri, 11 Dec 2015 11:55:09 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Mike Christie <michaelc@...wisc.edu>
Cc:	device-mapper development <dm-devel@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Jens Axboe <axboe@...nel.dk>,
	Mike Snitzer <msnitzer@...hat.com>, linux-scsi@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [dm-devel] [PATCH 0/15] copy offload patches

On Thu, Dec 10, 2015 at 11:06:04PM -0600, Mike Christie wrote:
> 
> 2. Start REQ_OP_READ off at non-zero to try and shake out code that was
> not converted.
> 
> There are a several places where we assume reads are zero and writes are
> 1 for things like indexing in arrays (like blktrace's ddir_act or dm
> starts), passing into block functions (like nvme_alloc_request's call of
> blk_mq_alloc_request), and if/else's. I am not done fixing all of them
> and testing.

If this turns out to be too painful we should just skip it.  I though it
would be a nie debugging aid, but we don't need to do it at any cost.
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