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

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Date:	Wed, 17 Aug 2016 02:52:44 +0200
From:	Christoph Hellwig <hch@....de>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Christoph Hellwig <hch@....de>,
	Shaun Tancheff <shaun.tancheff@...gate.com>,
	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 Tue, Aug 16, 2016 at 10:20:25AM +0300, Adrian Hunter wrote:
> 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.

That patch is complete crap and if anyone thinks they'd get shit like
that in they are on the same crack that apparently the authors of the
UFS spec are on.

If you want secure discard supported in UFS get a command for into
SBC instead of bypassing the command set.