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

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Message-ID: <20160815181328.GA9696@lst.de>
Date:	Mon, 15 Aug 2016 20:13:28 +0200
From:	Christoph Hellwig <hch@....de>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: Fix secure erase

> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -366,7 +366,10 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
>  	list_for_each_prev(entry, &q->queue_head) {
>  		struct request *pos = list_entry_rq(entry);
>  
> -		if ((req_op(rq) == REQ_OP_DISCARD) != (req_op(pos) == REQ_OP_DISCARD))
> +		if ((req_op(rq) == REQ_OP_DISCARD ||
> +		     req_op(rq) == REQ_OP_SECURE_ERASE) !=
> +		    (req_op(pos) == REQ_OP_DISCARD ||
> +		     req_op(pos) == REQ_OP_SECURE_ERASE))
>  			break;

This really should be a:

	if (req_op(rq) != req_op(pos))

I'l lleave it up to Jens if he wants that in this patch or not, otherwise
I'll send an incremental patch.

Otherwise this looks fine:

Reviewed-by: Christoph Hellwig <hch@....de>