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Message-ID: <4C2C8A3C.8000803@kernel.dk>
Date:	Thu, 01 Jul 2010 14:29:48 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	snitzer@...hat.com, hch@....de, James.Bottomley@...e.de,
	linux-scsi@...r.kernel.org, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re:

On 2010-07-01 12:49, FUJITA Tomonori wrote:
> This patchset fixes page leak issue in discard commands with unprep
> facility that James posted:
> 
> http://marc.info/?l=linux-scsi&m=127791727508214&w=2
> 
> The 1/3 patch adds unprep facility to the block layer (identical to
> what James posted).
> 
> The 2/3 patch frees a page for discard commands by using the unprep
> facility. James' original patch doesn't work since it accesses to
> rq->bio in q->unprep_rq_fn. We hit oops since q->unprep_rq_fn is
> called when all the data buffer (req->bio and scsi_data_buffer) in the
> request is freed.
> 
> I use rq->buffer to keep track of an allocated page as the block layer
> sets rq->buffer to the address of bio's page. scsi-ml (and llds) don't
> use rq->buffer (rq->buffer is set to NULL). So I can't say that I like
> it lots. Any other way to do that?
> 
> The 3/3 path just removes the dead code.

I've queued up these three for 2.6.36.

-- 
Jens Axboe

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