From mboxrd@z Thu Jan  1 00:00:00 1970
From: martin.petersen@oracle.com (Martin K. Petersen)
Date: Wed, 28 Jan 2015 17:28:41 -0500
Subject: [PATCH] NVMe: Skip namespaces with interleaved meta-data
In-Reply-To: <alpine.LNX.2.00.1501282210070.15481@localhost.lm.intel.com>
 (Keith Busch's message of "Wed, 28 Jan 2015 22:17:21 +0000 (UTC)")
References: <1422382021-15350-1-git-send-email-keith.busch@intel.com>
 <1422395867952.40819@hgst.com>
 <alpine.LNX.2.00.1501272203000.15481@localhost.lm.intel.com>
 <alpine.LNX.2.00.1501280111410.15481@localhost.lm.intel.com>
 <yq1zj93iszd.fsf@sermon.lab.mkp.net>
 <alpine.LNX.2.00.1501281456010.15481@localhost.lm.intel.com>
 <54C94B90.20805@ranbarg.com>
 <alpine.LNX.2.00.1501282102210.15481@localhost.lm.intel.com>
 <54C958D1.3010209@ranbarg.com> <yq1iofqimmu.fsf@sermon.lab.mkp.net>
 <alpine.LNX.2.00.1501282210070.15481@localhost.lm.intel.com>
Message-ID: <yq1egqeilpi.fsf@sermon.lab.mkp.net>

>>>>> "Keith" == Keith Busch <keith.busch at intel.com> writes:

>> I think the best way to go about dealing with all this is to set
>> PRACT=1 if no bip is attached to a bio bound for a name space
>> formatted with PI.

Keith> That's an option for a subset of formats I eluded to before. It
Keith> will have the controller generate/strip if the metadata size 8
Keith> bytes with DPS settings, but ignored otherwise. We still need a
Keith> buffer if metadata is not used for PI, or if the metadata size
Keith> more than 8 bytes.

I agree it's a deficiency in the NVMe spec that there are no explicit
handling flags for non-PI metadata in split mode.

-- 
Martin K. Petersen	Oracle Linux Engineering