linux-kernel - Re: [PATCH 5/6] block: dasd_genhd: convert to blkdev_reread

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Date:	Tue, 7 Apr 2015 09:59:46 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jarod Wilson <jarod@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	David Herrmann <dh.herrmann@...il.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	"nbd-general@...ts.sourceforge.net" 
	<nbd-general@...ts.sourceforge.net>,
	Stefan Haberland <stefan.haberland@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Fabian Frederick <fabf@...net.be>, linux-s390@...r.kernel.org
Subject: Re: [PATCH 5/6] block: dasd_genhd: convert to blkdev_reread_part

On Mon, Apr 6, 2015 at 9:51 PM, Jarod Wilson <jarod@...hat.com> wrote:
>>
>> Note: patch 6/6 in the series makes this whole while() loops pointless,
>> since the possibility of the -EBUSY return goes away.
>
> Minor clarification: the -EBUSY due to the trylock, which is why that
> retry loop exists, goes away. You *could* still get an -EBUSY through
> blkdev_reread_part()->rescan_partitions()->drop_partitions() if
> bdev->bd_part_count is non-zero.

Not like trylock(&bd_mutex), Inside kernel, it should be driver's
responsibility to avoid that before rescanning partitions, that said
retry may not be needed for this case.

Thanks,
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