linux-kernel - Re: [PATCH v6 05/11] block: remove split code in blkdev_issue_{discard,write

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Date:	Wed, 14 Oct 2015 09:50:31 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Keith Busch <keith.busch@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Ming Lin <mlin@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Ming Lin <ming.l@....samsung.com>,
	Mike Snitzer <snitzer@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-nvme@...ts.infradead.org, Dongsu Park <dpark@...teo.net>,
	Kent Overstreet <kent.overstreet@...il.com>
Subject: Re: [PATCH v6 05/11] block: remove split code in
 blkdev_issue_{discard,write_same}B

On Wed, Oct 14, 2015 at 04:38:50PM +0000, Keith Busch wrote:
> I see why the proposal is an improvement, but I don't understand why the
> current situation results in a hang. Are we missing some kind of error
> recovery in the driver?

The driver tries to abort the commands and eventually gets into a death
spiral.  I'm still trying to understand what exactly is going on.

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