linux-kernel - Re: [RFC] situation with fput() locking (was Re: [PULL REQUEST] : ima-appraisal patches)

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Message-ID: <CA+55aFzinX_6DVvDTyxrsP6VEHVY2Q+Y=e+qksnAjR+oT3GZew@mail.gmail.com>
Date:	Thu, 19 Apr 2012 19:58:57 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	David Safford <safford@...ux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC] situation with fput() locking (was Re: [PULL REQUEST] :
 ima-appraisal patches)

On Thu, Apr 19, 2012 at 7:54 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Umm...  I really wonder if we *want* filp_close() under any kind of
> locks.  You are right - it should not be deferred.  I haven't finished
> checking the callers of that puppy, but if we really do it while holding
> any kind of lock, we are asking for trouble.  So I'd rather switch
> filp_close() to use of fput_nodefer() if that turns out to be possible.

Ok, fair enough, looks like a reasonable plan to me.

                  Linus
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