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

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Date:	Mon, 15 Aug 2016 20:14:57 +0200
From:	Christoph Hellwig <hch@....de>
To:	Shaun Tancheff <shaun.tancheff@...gate.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>, Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@....de>,
	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>
Subject: Re: [PATCH] block: Fix secure erase

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..