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

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Date:	Wed, 30 Jun 2010 12:41:55 +0200
From:	Christoph Hellwig <hch@....de>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Christoph Hellwig <hch@....de>,
	James Bottomley <James.Bottomley@...e.de>,
	Mike Snitzer <snitzer@...hat.com>, axboe@...nel.dk,
	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	martin.petersen@...cle.com, akpm@...ux-foundation.org,
	linux-scsi@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: [PATCH 1/2] block: fix leaks associated with discard request payload

On Wed, Jun 30, 2010 at 01:25:01PM +0300, Boaz Harrosh wrote:
> OK, Thanks, I see. Is it one of these operations, (like we have in OSD) where
> the CDB information spills into the payload? like the scatter-gather and extent
> lists and such.

For UNMAP the payload is a list of block number / length pairs, while
the CDB itself doesn't contain any information like that.  It's a rather
awkward command.

> Do we actually use a WRITE_SAME which is not zero? for what use?

The kernel doesn't issue any WRITE SAME without the unmap bit set.
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