linux-kernel - Re: [PATCH 1/2] block: fix leaks associated with discard request payload

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Message-ID: <20100627141638.GD3970@redhat.com>
Date:	Sun, 27 Jun 2010 10:16:40 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	hch@....de, axboe@...nel.dk, dm-devel@...hat.com,
	James.Bottomley@...e.de, linux-kernel@...r.kernel.org,
	martin.petersen@...cle.com, akpm@...ux-foundation.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/2] block: fix leaks associated with discard request
 payload

On Sun, Jun 27 2010 at  8:32am -0400,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Sun, 27 Jun 2010 13:07:12 +0200
> Christoph Hellwig <hch@....de> wrote:
> 
> > > How about this?
> > 
> > As I tried to explain before this utterly confuses the I/O completion
> > path.  With the patch applied even a simple mkfs.xfs that issues discard
> > just hangs.
> 
> Wired. I just tried mkfs.xfs against scsi_debug with my block patches
> (I saw one discard command). Seemed that it worked fine.

My leak fixes have been tested extensively against all permuations of
devices with discards (ATA trim, SCSI UNMAP, SCSI WRTIE SAME w/ unmap=1).

I think we need to get Christoph's discard payload transformation
complete by fixing the leaks _without_ trying to rework how discard
commands are tagged, etc.  E.g. fix what Jens already has staged in
linux-2.6-block's 'for-next' and 'for-2.6.36'.

With that sorted out we can then look at longer term changes to cleanup
discard request processing.

Regards,
Mike
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