linux-kernel - Re: [PATCH v2 3/3] NFS: Fix a memory leak in nfs

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Message-ID: <AANLkTinsEeKK9LykVAVq60Lsb3caLDJasnKH8kcgSFVp@mail.gmail.com>
Date:	Wed, 1 Dec 2010 11:47:14 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Nick Bowler <nbowler@...iptictech.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-nfs@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 3/3] NFS: Fix a memory leak in nfs_readdir

On Wed, Dec 1, 2010 at 10:54 AM, Trond Myklebust
<Trond.Myklebust@...app.com> wrote:
>
> Hmm... Looking again at the problem, it appears that the same callback
> needs to be added to truncate_complete_page() and
> invalidate_complete_page2(). Otherwise we end up in a situation where
> the page can sometimes be removed from the page cache without calling
> freepage().

Yes, I think any caller of __remove_from_page_cache() should do it
once it has dropped all locks.

And to be consistent with that rule, even in the __remove_mapping()
function I suspect the code to call ->freepage() might as well be done
only in the __remove_from_page_cache() case (ie not in the
PageSwapCache() case).

Then, add the case to the end of "remove_page_cache()" itself, and now
it's really easy to just grep for __remove_from_page_cache() and make
sure they all do it.

That sounds sane, no?

                Linus
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