linux-kernel - Re: [PATCH] vfs: check i_count under lock in evict

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Message-ID: <20160712052624.GC14480@ZenIV.linux.org.uk>
Date:	Tue, 12 Jul 2016 06:26:24 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Chen <david.chen@...exus.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] vfs: check i_count under lock in evict_inodes

On Mon, Jul 11, 2016 at 06:31:57PM -0700, David Chen wrote:
> Hi Al,
> 
> I'm not sure about the in-tree fs, but in zfsonlinux, it would offload
> iput to a thread, so this would happen there. And it would wait for
> the thread in put_super(), so that part is not a problem...

*shrug*  I hadn't looked (and won't look) at zfs glue, but I'd suggest
trying something along the line of stopping that thread in the beginning
of your ->kill_sb() (having told the sucker to stop offloading, of course)
and only then calling generic_shutdown_super()...