linux-kernel - Re: [PATCH] mm: do_generic_file_read() never gets a NULL 'filp' argument

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Message-Id: <20080922103635.77d795e4.akpm@linux-foundation.org>
Date:	Mon, 22 Sep 2008 10:36:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Krishna Kumar <krkumar2@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: do_generic_file_read() never gets a NULL 'filp'
 argument

On Mon, 22 Sep 2008 04:39:46 -0400 Christoph Hellwig <hch@...radead.org> wrote:

> On Mon, Sep 22, 2008 at 01:33:38AM -0700, Andrew Morton wrote:
> > On Mon, 22 Sep 2008 11:46:10 +0530 Krishna Kumar <krkumar2@...ibm.com> wrote:
> > 
> > > From: Krishna Kumar <krkumar2@...ibm.com>
> > > 
> > > The 'filp' argument to do_generic_file_read() is never NULL.
> > > 
> > 
> > How did you verify this?
> > 
> > NFS used to like passing NULL file*'s into VFS functions.  I don't
> > recall whether it affected do_generic_file_read().
> 
> The only thing nfsd passed a NULL file pointer in is ->fsync on
> directories.

NFS, not NFSD.  It was page_cache_read(), iirc.

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