linux-kernel - Re: mmotm 2009-01-14-20-31 uploaded (gfs2)

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Message-Id: <20090116084352.9f35b822.akpm@linux-foundation.org>
Date:	Fri, 16 Jan 2009 08:43:52 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Whitehouse <swhiteho@...hat.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Subject: Re: mmotm 2009-01-14-20-31 uploaded (gfs2)

On Fri, 16 Jan 2009 10:20:03 +0000 Steven Whitehouse <swhiteho@...hat.com> wrote:

> Hi,
> 
> On Thu, 2009-01-15 at 11:13 -0800, Randy Dunlap wrote:
> > akpm@...ux-foundation.org wrote:
> > > The mm-of-the-moment snapshot 2009-01-14-20-31 has been uploaded to
> > > 
> > >    http://userweb.kernel.org/~akpm/mmotm/
> > > 
> > > and will soon be available at
> > > 
> > >    git://git.zen-sources.org/zen/mmotm.git
> > 
> > 
> > when CONFIG_FILE_LOCKING=n:
> > 
> > mmotm-2009-0114-2031/fs/gfs2/ops_file.c:746: error: 'generic_setlease' undeclared here (not in a function)
> > 
> > 
> > since generic_setlease() is a macro/define in that case.
> > 
> Hmm, it looks like I'll have to do this, in that case:
> 
> diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
> index 99d726f..4580335 100644
> --- a/fs/gfs2/ops_file.c
> +++ b/fs/gfs2/ops_file.c
> @@ -743,7 +743,9 @@ const struct file_operations *gfs2_file_fops_nolock = &(const struct file_operat
>  	.fsync		= gfs2_fsync,
>  	.splice_read	= generic_file_splice_read,
>  	.splice_write	= generic_file_splice_write,
> +#ifdef CONFIG_FILE_LOCKING
>  	.setlease	= generic_setlease,
> +#endif /* CONFIG_FILE_LOCKING */
>  };
>  
>  const struct file_operations *gfs2_dir_fops_nolock = &(const struct file_operations){
> 
> 
> which is not ideal, but I don't see any easy way to avoid the #ifdef,
> 

Take a look in fs.h:

#define generic_setlease(a, b, c) ({ -EINVAL; })

If that wasn't a stupid macro, your code would have compiled and ran
just as intended.

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