linux-kernel - Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

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Date:	Mon, 28 Jul 2014 15:02:46 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Sitsofe Wheeler <sitsofe@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	"gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel\@linuxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering\@suse.com" <ohering@...e.com>,
	"apw\@canonical.com" <apw@...onical.com>,
	"jasowang\@redhat.com" <jasowang@...hat.com>,
	"jbottomley\@parallels.com" <jbottomley@...allels.com>,
	"linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

>>>>> "KY" == KY Srinivasan <kys@...rosoft.com> writes:

KY,

KY> "At the time thin-provisioning was defined, the discovery
KY> information was first proposed in READ CAPACITY 16 command. And then
KY> moved into the new dedicated VPD page - B2h. You can see the
KY> information reported in this VPD page is richer than READ CAPACITY
KY> 16 command. As this transition happened during we added the feature,
KY> Windows uses the newer method that based on VPD page B2h. It looks
KY> Linux tries to use both new and old method which is weird to me."

The READ CAPACITY(16) response is not optional.

SBC3r36 section 4.7.3.3 Thin provisioned logical unit:

The device server in a thin provisioned logical unit shall set:

a) the LBPME bit to one in the READ CAPACITY (16) parameter data (see
   5.16.2); and

b) the PROVISIONING TYPE field to 010b (i.e., thin provisioned) in the
   Logical Block Provisioning VPD page (see 6.6.4).

That's a "shall". The LBP VPD elaborates on the provisioning type,
commands preference, etc. But it's all gated by LBPME=1 in the READ
CAPACITY(16) response.

-- 
Martin K. Petersen	Oracle Linux Engineering
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