linux-kernel - Re: [PATCH 3/3] target/iblock: Add WRITE

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Date:	Thu, 15 Nov 2012 20:32:35 +0100
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 3/3] target/iblock: Add WRITE_SAME w/ UNMAP=0 emulation
	support

On Thu, Nov 15, 2012 at 11:29:46AM -0800, Nicholas A. Bellinger wrote:
> Well at least for the latter that is because UNMAP=0 does not have a
> payload.  ;)

UNMAP=0 does have a payload, we just ignore it.  In fact I was told
that targets should check for a completely zeroed sector sized payload
for it if being pedantic.  I can't really find the justification for
that in the standard - the closest thing to it is the stance about
ignoring the unmap bit if the device is fully provisioned.

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