From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: linux-scsi@vger.kernel.org,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] scsi: relax PAGE LENGTH check for thin provisioning UNMAP support
Date: Thu, 06 May 2010 00:28:10 -0400 [thread overview]
Message-ID: <yq1sk65ejs5.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <1273096203-3164-1-git-send-email-snitzer@redhat.com> (Mike Snitzer's message of "Wed, 5 May 2010 17:50:03 -0400")
>>>>> "Mike" == Mike Snitzer <snitzer@redhat.com> writes:
Mike> Thin Provisioning fields are assumed available in the BLOCK LIMITS
Mike> VPD page if PAGE LENGTH is 0x3c. The BLOCK LIMITS VPD page may be
Mike> extended over time. Allow for the possibility that the PAGE
Mike> LENGTH exceeds 0x3c.
SBC3 states that:
"If the device server supports thin provisioning, then the device server
shall set the PAGE LENGTH field to 3Ch."
That's a "shall". That's a non-negotiable requirement in standards
speak. And besides, only half of that mandated page length is currently
spoken for. So I wonder what motivated your change? Do you have any
examples of devices with a bigger page length?
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2010-05-06 4:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 21:50 [PATCH] scsi: relax PAGE LENGTH check for thin provisioning UNMAP support Mike Snitzer
2010-05-06 4:28 ` Martin K. Petersen [this message]
2010-05-06 11:24 ` Mike Snitzer
2010-05-06 14:27 ` Knight, Frederick
2010-05-07 4:52 ` Martin K. Petersen
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