linux-kernel - Re: [PATCH] autofs

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Message-Id: <20140423144624.716f325d454f9debd97bef15@linux-foundation.org>
Date:	Wed, 23 Apr 2014 14:46:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ian Kent <raven@...maw.net>
Cc:	autofs mailing list <autofs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] autofs - fix lockref lookup

On Wed, 23 Apr 2014 13:20:36 +0800 Ian Kent <raven@...maw.net> wrote:

> autofs needs to be able to see private data dentry flags for
> its dentrys that are being created but not yet hashed and for
> its dentys that have been rmdir()ed but not yet freed. It
> needs to do this so it can block processes in these states
> until a status has been returned to indicate the given
> operation is complete.
> 
> It does this by keeping two lists, active and expring, of
> dentrys in this state and uses ->d_release() to keep them
> stable while it checks the reference count to determine
> if they should be used.
> 
> But with the recent lockref changes dentrys being freed
> sometimes don't transition to a reference count of 0 before
> being freed so autofs can occassionally use a dentry that
> is invalid which can lead to a panic.

What's the value of "recent"?  I assume 3.14 is OK?
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