linux-kernel - Re: [PATCH] block: Fix secure erase

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Date:	Tue, 16 Aug 2016 10:20:25 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Christoph Hellwig <hch@....de>,
	Shaun Tancheff <shaun.tancheff@...gate.com>
Cc:	Jens Axboe <axboe@...com>, Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-block@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Bingaman <josh.bingaman@...gate.com>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	Joao Pinto <Joao.Pinto@...opsys.com>,
	linux-scsi@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Pawel Wodkowski <pawelx.wodkowski@...el.com>
Subject: Re: [PATCH] block: Fix secure erase

On 15/08/16 21:14, Christoph Hellwig wrote:
> On Mon, Aug 15, 2016 at 11:43:12AM -0500, Shaun Tancheff wrote:
>> Hmm ... Since REQ_SECURE implied REQ_DISCARD doesn't this
>> mean that we should include REQ_OP_SECURE_ERASE checking
>> wherever REQ_OP_DISCARD is being checked now in drivers/scsi/sd.c ?
>>
>> (It's only in 3 spots so it's a quickie patch)
> 
> SCSI doesn't support secure erase operations.  Only MMC really
> supports it, plus the usual cargo culting in Xen blkfront that's
> probably never been tested..
> 

I left SCSI out because support does not exist at the moment.
However there is UFS which is seen as the replacement for eMMC.
And there is a patch to add support for BLKSECDISCARD:

	http://marc.info/?l=linux-scsi&m=146953519016056

So SCSI will need updating if that is to go in.