linux-kernel - Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY

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Message-ID: <52D41563.9050309@dev.mellanox.co.il>
Date:	Mon, 13 Jan 2014 18:33:39 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	dgilbert@...erlog.com,
	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	Sagi Grimberg <sagig@...lanox.com>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	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>, Hannes Reinecke <hare@...e.de>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16


> Back to the original question, I don't think Sagi was
> asking if it was valid to do a legacy/unprotected READ,
> it was what to expect with a protected READ on
> unwritten blocks:
>
> > So this takes me to a corner I still don't understand, if
> > a LUN is pre-formatted as T10-protected, what happens to
> > unwritten blocks read?
>
> So the precise answer is: the PI will be all 0xff bytes,
> unless logical provisioning is enabled, LBPRZ=0 and the
> device's compliance predates sbc3r34.pdf (November 2012).
>
> Doug Gilbert
>
>

Thanks Doug,

This answer translates directly into a fix in my T10-PI offload API.

Sagi.
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