Date: Sun, 27 Jun 2010 17:33:35 +0200
From: Christoph Hellwig <hch@lst.de>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: hch@lst.de, snitzer@redhat.com, axboe@kernel.dk, dm-devel@redhat.com,
       James.Bottomley@suse.de, linux-kernel@vger.kernel.org,
       martin.petersen@oracle.com, akpm@linux-foundation.org,
       linux-scsi@vger.kernel.org
Subject: Re: [PATCH 1/2] block: fix leaks associated with discard request payload
Message-ID: <20100627153335.GA25667@lst.de>
References: <20100627185927K.fujita.tomonori@lab.ntt.co.jp> <20100627193253P.fujita.tomonori@lab.ntt.co.jp> <20100627110712.GA14511@lst.de> <20100627212952D.fujita.tomonori@lab.ntt.co.jp>
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On Sun, Jun 27, 2010 at 09:32:07PM +0900, FUJITA Tomonori wrote:
> On Sun, 27 Jun 2010 13:07:12 +0200
> Christoph Hellwig <hch@lst.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.

Doesn't work for me against either a real SSD or WRITE SAME support in
qemu.  But I think I didn't actually have your barrier patches applied,
so I'll try again with a clean tree.

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