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Subject: Re: [PATCH v7 0/6] vfs: Use dlock list for SB's s_inodes list
To: Boqun Feng <boqun.feng@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.com>,
        Jeff Layton <jlayton@poochiereds.net>,
        "J. Bruce Fields" <bfields@fieldses.org>, Tejun Heo <tj@kernel.org>,
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        Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Andi Kleen <andi@firstfloor.org>, Dave Chinner <dchinner@redhat.com>,
        Davidlohr Bueso <dave@stgolabs.net>
References: <1507229008-20569-1-git-send-email-longman@redhat.com>
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 <20171027005753.GA22994@tardis>
From: Waiman Long <longman@redhat.com>
Organization: Red Hat
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Date: Fri, 27 Oct 2017 16:19:14 -0400
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On 10/26/2017 08:58 PM, Boqun Feng wrote:
>> Is there other objections about merging this patch series? With the
>> additional patches 8 & 9 that I sent out on Oct 17, I think I had
>> addressed all the concerns that I received so far. Please let me know
>> what else do I need to do to make these patches mergeable?
>>
> Hi Waiman,
>
> Have you read my email about the dlist_for_each_entry_safe():
>
> 	https://marc.info/?l=linux-kernel&m=150831690725964&w=2
>
> ?
>
> Regards,
> Boqun

I am sorry that I somehow forgot to respond to this email. Anyway,
dlist_for_each_entry_safe() is not currently used and so was not that
well-tested. I just sent out another patch to fix that use-after-unlock
problem that you had found. The fix is somewhat different from what you
proposed, but that should still fix the problem. I modified some
dlist_for_each_entry() macros to dlist_for_each_entry_safe(), compiled
and boot the kernel. I haven't seen any problem so far.

Cheers,
Longman