Re: [PATCH v2 3/3] NFS: Fix a memory leak in nfs_readdir

[Benny Halevy]

On 2010-12-01 18:35, Rik van Riel wrote:
> On 12/01/2010 11:17 AM, Linus Torvalds wrote:
> 
>> So this is a TOTALLY UNTESTED trivial patch that just adds another
>> callback. Does this work? I dunno. But I get the feeling that instead
>> of having NFS work around the odd semantics that don't actually match
>> what NFS wants, introducing a new callback with much simpler semantics
>> would be simpler for everybody, and avoid the need for subtle code.
> 
> Surely somebody can have just looked up the page and
> gotten a reference count, right before your ->freepage
> call is invoked?
> 
> CPU A				CPU B
> 
> look up page
> grab refcount
> 				->freepage
> 
> use contents of page
> 
> Am I overlooking something obvious?
> 

The page is not cached any more at this point therefore
looking it up won't find it.

Benny
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