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Date: Mon, 6 Apr 2015 07:49:51 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/6] block: loop: don't hold lo_ctl_mutex in lo_open
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To: Ming Lei <ming.lei@canonical.com>
Cc: Jens Axboe <axboe@kernel.dk>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@infradead.org>, Tejun Heo <tj@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Jarod Wilson <jarod@redhat.com>, David Herrmann <dh.herrmann@gmail.com>, Markus Pargmann <mpa@pengutronix.de>, "nbd-general@lists.sourceforge.net" <nbd-general@lists.sourceforge.net>, Stefan Haberland <stefan.haberland@de.ibm.com>, Sebastian Ott <sebott@linux.vnet.ibm.com>, Fabian Frederick <fabf@skynet.be>, linux-s390@vger.kernel.org
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On Mon, Apr 06, 2015 at 12:28:22AM +0800, Ming Lei wrote:
> Another simpler way is to make lo_refcnt as atomic_t and remove
> lo_ctrl_mutext in lo_open(), and freeze request queue during clearing
> fd, and better to freeze queue during setting fd too, so will update in
> v1 with this way.

Using an atomic_t sounds good to me.