From: Jan Kara <jack@suse.cz>
To: Tejun Heo <tj@kernel.org>
Cc: Jan Kara <jack@suse.cz>, 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 0/13 v2] block: Fix block device shutdown related races
Date: Wed, 1 Mar 2017 16:37:00 +0100 [thread overview]
Message-ID: <20170301153700.GJ20512@quack2.suse.cz> (raw)
In-Reply-To: <20170228165441.GH15287@htj.duckdns.org>
Hello,
On Tue 28-02-17 11:54:41, Tejun Heo wrote:
> It generally looks good to me.
Thanks for review!
> The only worry I have is around wb_shutdown() synchronization and if that
> is actually an issue it shouldn't be too difficult to fix.
Yeah, I'll have a look at that.
> The other thing which came to mind is that the congested->__bdi sever
> semantics. IIRC, that one was also to support the "bdi must go away now"
> behavior. As bdi is refcnted now, I think we can probably just let cong
> hold onto the bdi rather than try to sever the ref there.
So currently I get away with __bdi not being a proper refcounted reference.
If we were to remove the clearing of __bdi, we'd have to make it into
refcounted reference which is sligthly ugly as we need to special-case
embedded bdi_writeback_congested structures. Maybe it will be a worthwhile
cleanup but for now I left it alone...
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2017-03-01 15:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 17:09 [PATCH 0/13 v2] block: Fix block device shutdown related races Jan Kara
2017-02-21 17:09 ` [PATCH 01/13] block: Move bdev_unhash_inode() after invalidate_partition() Jan Kara
2017-02-21 17:09 ` [PATCH 02/13] block: Unhash also block device inode for the whole device Jan Kara
2017-02-21 17:09 ` [PATCH 03/13] block: Revalidate i_bdev reference in bd_aquire() Jan Kara
2017-02-21 17:09 ` [PATCH 04/13] block: Move bdi_unregister() to del_gendisk() Jan Kara
2017-02-21 19:53 ` Bart Van Assche
2017-02-22 8:51 ` Jan Kara
2017-02-22 17:42 ` Bart Van Assche
2017-02-21 17:09 ` [PATCH 05/13] bdi: Mark congested->bdi as internal Jan Kara
2017-02-28 16:06 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 06/13] bdi: Make wb->bdi a proper reference Jan Kara
2017-02-28 16:07 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 07/13] bdi: Move removal from bdi->wb_list into wb_shutdown() Jan Kara
2017-02-28 16:14 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 08/13] bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy() Jan Kara
2017-02-28 16:44 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 09/13] bdi: Do not wait for cgwbs release in bdi_unregister() Jan Kara
2017-02-28 16:51 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 10/13] bdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister() Jan Kara
2017-02-28 16:51 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 11/13] block: Fix oops in locked_inode_to_wb_and_lock_list() Jan Kara
2017-02-28 16:52 ` Tejun Heo
2017-02-21 17:09 ` [PATCH 12/13] kobject: Export kobject_get_unless_zero() Jan Kara
2017-02-21 19:39 ` Bart Van Assche
2017-02-21 17:09 ` [PATCH 13/13] block: Fix oops scsi_disk_get() Jan Kara
2017-02-21 19:33 ` Bart Van Assche
2017-02-21 17:19 ` [PATCH 0/13 v2] block: Fix block device shutdown related races Jan Kara
2017-02-21 18:55 ` Dan Williams
2017-02-21 17:19 ` Jens Axboe
2017-02-22 10:24 ` Jan Kara
2017-03-01 7:25 ` Omar Sandoval
2017-03-01 7:26 ` Omar Sandoval
2017-03-01 15:11 ` Jan Kara
2017-03-06 20:38 ` Omar Sandoval
2017-03-07 13:57 ` Jan Kara
2017-03-07 16:28 ` Omar Sandoval
2017-03-08 13:21 ` Jan Kara
2017-02-28 16:54 ` Tejun Heo
2017-03-01 15:37 ` Jan Kara [this message]
2017-03-01 16:26 ` Tejun Heo
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