netdev - Re: [PATCH 1/2] Revert "af_unix: Fix splice-bind deadlock"

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Message-Id: <20160904.132940.872673973522105066.davem@davemloft.net>
Date:   Sun, 04 Sep 2016 13:29:40 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     torvalds@...ux-foundation.org
Cc:     hannes@...essinduktion.org, rweikusat@...ileactivedefense.com,
        edumazet@...gle.com, w@....eu, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] Revert "af_unix: Fix splice-bind deadlock"

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Fri, 2 Sep 2016 11:09:23 -0700 (PDT)

> 
> From: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Thu, 1 Sep 2016 14:56:49 -0700
> Subject: [PATCH 1/2] Revert "af_unix: Fix splice-bind deadlock"
> 
> This reverts commit c845acb324aa85a39650a14e7696982ceea75dc1.
> 
> It turns out that it just replaces one deadlock with another one: we can
> still get the wrong lock ordering with the readlock due to overlayfs
> calling back into the filesystem layer and still taking the vfs locks
> after the readlock.
> 
> The proper solution ends up being to just split the readlock into two
> pieces: the bind lock (taken *outside* the vfs locks) and the IO lock
> (taken *inside* the filesystem locks).  The two locks are independent
> anyway.
> 
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

Applied.