linux-kernel - Re: [PATCH][SCS] sd: Read Capacity if (16) fails

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Message-ID: <yq1bq06w0tb.fsf@sermon.lab.mkp.net>
Date:	Wed, 06 Aug 2008 12:44:16 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Hugh Dickins <hugh@...itas.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][SCS] sd: Read Capacity if (16) fails

>>>>> "James" == James Bottomley <James.Bottomley@...senPartnership.com> writes:

James> On Wed, 2008-08-06 at 16:34 +0100, Hugh Dickins wrote:
>> PQual=0 Device_type=0 RMB=1 version=0x00 [no conformance claimed]

James> We could try using this as the trigger.  I assume all DIF
James> supporting devices must also claim conformance to SPC3/SBC2 or
James> higher?

You'd think, wouldn't you?

Originally I only checked for PROTECT if version was SBC2 or better.
But as it turns out I have drives that only report SBC and yet they do
DIF.  This old version is apparently reported to prevent problems in
other operating systems.

*sigh*

-- 
Martin K. Petersen	Oracle Linux Engineering

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