linux-kernel - Re: [patch 1/2]block: handle merged discard request

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Message-ID: <CAMM=eLcBMrOfhJZU2GsSnMXkmWZMemJcvTM6WPLiiXkysXHYiQ@mail.gmail.com>
Date:	Fri, 17 Aug 2012 23:06:16 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Shaohua Li <shli@...nel.org>, Vivek Goyal <vgoyal@...hat.com>,
	axboe@...nel.dk, linux-kernel@...r.kernel.org, neilb@...e.de,
	linux-scsi@...r.kernel.org
Subject: Re: [patch 1/2]block: handle merged discard request

On Thu, Jun 21, 2012 at 11:46 PM, Martin K. Petersen
<martin.petersen@...cle.com> wrote:
>>>>>> "Christoph" == Christoph Hellwig <hch@...radead.org> writes:
>
>>> There are several additional commands in the pipeline where the 1:1
>>> mapping between DMA size and block range is invalid. I want to get
>>> rid of the 1:1 assumption in general so we can handle any command
>>> without these evil workarounds.
>
> Christoph> What's the progress on getting these issues sorted out?
>
> This has bitrotted for a while. I'll put it on my list. I should finally
> have some bandwidth again next week...

Hey Martin,

I rebased (and fixed/tested) your writesame patches on v3.6-rc2 +
jens' for-linus branch, the git tree is available here:
https://github.com/snitm/linux/tree/writesame

I've also made the updated patchset available here:
http://people.redhat.com/msnitzer/patches/upstream/writesame/series.html

Should the writesame patches come before any discard merge or 1:1 DMA
and block range assumption fixes?
NOTE (for others besides martin):
http://people.redhat.com/msnitzer/patches/upstream/writesame/0001-block-Clean-up-merge-logic.patch
removes all the discard merge hacks; I think it provides a clean
baseline to then layer discard merge support back in -- but maybe
that's a flawed strategy?

Could be I've wasted a few hours by rebasing these patches...
regardless, it would be great if you could share what your plans are.

Thanks!
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