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From: Tejun Heo <tj@kernel.org>
To: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>,
	Lekshmi Pillai <lekshmicpillai@in.ibm.com>,
	NeilBrown <neilb@suse.de>, Omar Sandoval <osandov@osandov.com>
Subject: Re: [PATCH 02/11] block: Fix race of bdev open with gendisk shutdown
Date: Tue, 7 Mar 2017 14:43:49 -0500	[thread overview]
Message-ID: <20170307194349.GF31179@htj.duckdns.org> (raw)
In-Reply-To: <20170307111420.GF2578@quack2.suse.cz>

Hello,

On Tue, Mar 07, 2017 at 12:14:20PM +0100, Jan Kara wrote:
> > Given that this isn't a super hot path, I think it'd be far better to
> > stick to a simpler synchronization mechanism.
> 
> I'd be happy to do so however struct gendisk does not have any lock in it
> and introducing a special lock just for that seems awkward.

I think even a awkward shared lock is better than memory barriers.
Barriers are the trickiest locking construct to get right and we
really shouldn't using that unless absolutely necessary.

Thanks.

-- 
tejun

  reply	other threads:[~2017-03-07 19:43 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-06 16:33 [PATCH 0/11 v3] block: Fix block device shutdown related races Jan Kara
2017-03-06 16:33 ` [PATCH 01/11] block: Fix bdi assignment to bdev inode when racing with disk delete Jan Kara
2017-03-06 22:01   ` Tejun Heo
2017-03-07  6:47   ` Hannes Reinecke
2017-03-06 16:33 ` [PATCH 02/11] block: Fix race of bdev open with gendisk shutdown Jan Kara
2017-03-06 22:04   ` Tejun Heo
2017-03-07 11:14     ` Jan Kara
2017-03-07 19:43       ` Tejun Heo [this message]
2017-03-08 14:25         ` Jan Kara
2017-03-06 16:33 ` [PATCH 03/11] bdi: Mark congested->bdi as internal Jan Kara
2017-03-06 16:33 ` [PATCH 04/11] bdi: Make wb->bdi a proper reference Jan Kara
2017-03-06 16:33 ` [PATCH 05/11] bdi: Move removal from bdi->wb_list into wb_shutdown() Jan Kara
2017-03-06 16:33 ` [PATCH 06/11] bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy() Jan Kara
2017-03-06 22:08   ` Tejun Heo
2017-03-06 16:34 ` [PATCH 07/11] bdi: Do not wait for cgwbs release in bdi_unregister() Jan Kara
2017-03-06 22:08   ` Tejun Heo
2017-03-06 16:34 ` [PATCH 08/11] bdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister() Jan Kara
2017-03-06 16:34 ` [PATCH 09/11] block: Fix oops in locked_inode_to_wb_and_lock_list() Jan Kara
2017-03-06 16:34 ` [PATCH 10/11] kobject: Export kobject_get_unless_zero() Jan Kara
2017-03-06 16:34 ` [PATCH 11/11] block: Fix oops scsi_disk_get() Jan Kara
  -- strict thread matches above, loose matches on Subject: below --
2017-03-13 15:13 [PATCH 0/11 v4] block: Fix block device shutdown related races Jan Kara
2017-03-13 15:14 ` [PATCH 02/11] block: Fix race of bdev open with gendisk shutdown Jan Kara
2017-03-21 16:19   ` Tejun Heo
2017-03-23  0:21     ` Jan Kara
2017-03-23 15:38       ` Tejun Heo
2017-11-17  6:51   ` Hou Tao
2017-11-20 16:43     ` Jan Kara
2017-11-24  3:12       ` Hou Tao

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