linux-kernel - Re: dcache shrink list corruption?

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Message-ID: <20140429181610.GJ18016@ZenIV.linux.org.uk>
Date:	Tue, 29 Apr 2014 19:16:10 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: dcache shrink list corruption?

On Tue, Apr 29, 2014 at 08:03:24PM +0200, Miklos Szeredi wrote:

> Introducing a new per-sb lock should be OK.
> 
> Another idea, which could have subtler effects, is simply not to kill
> a dentry that is on the shrink list (indicated by
> DCACHE_SHRINK_LIST), since it's bound to get killed anyway.  But
> that's a change in behaviour...

Umm...  You mean, if final dput() finds dentry already on shrink list,
just leave it there and return?  Might get really painful - the code
that knows it's holding the last reference to already unhashed dentry
might get a nasty surprise when dput() returns before it's killed off.
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