netdev - Re: [PATCH v2 4/5] NFS: remove RPC PipeFS mount point reference from blocklayout routines

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Date:	Wed, 11 Jan 2012 13:36:17 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	linux-nfs@...r.kernel.org, xemul@...allels.com, neilb@...e.de,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbottomley@...allels.com, bfields@...ldses.org,
	davem@...emloft.net, devel@...nvz.org
Subject: Re: [PATCH v2 4/5] NFS: remove RPC PipeFS mount point reference
 from blocklayout routines

On Wed, 2012-01-11 at 13:33 -0500, Trond Myklebust wrote: 
> On Tue, 2012-01-10 at 17:04 +0400, Stanislav Kinsbursky wrote: 
> > This is a cleanup patch. We don't need this reference anymore, because
> > blocklayout pipes dentries now creates and destroys in per-net operations and
> > on PipeFS mount/umount notification.
> > Note that nfs4blocklayout_register_net() now returns 0 instead of -ENOENT in
> > case of PipeFS superblock absence. This is ok, because blocklayout pipe dentry
> > will be created on PipeFS mount event.
> > 
> > Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
> > 
> > ---
> >  fs/nfs/blocklayout/blocklayout.c |    9 +--------
> >  1 files changed, 1 insertions(+), 8 deletions(-)
> > 
> > diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
> > index 322d920..2c70202 100644
> > --- a/fs/nfs/blocklayout/blocklayout.c
> > +++ b/fs/nfs/blocklayout/blocklayout.c
> > @@ -1034,7 +1034,7 @@ static struct dentry *nfs4blocklayout_register_net(struct net *net,
> >  
> >  	pipefs_sb = rpc_get_sb_net(net);
> >  	if (!pipefs_sb)
> > -		return ERR_PTR(-ENOENT);
> > +		return 0;
> 
> This looks like a typo of some sort. The caller in
> nfs4blocklayout_net_init() checks for IS_ERR(), not NULL. I'll just
> remove this hunk...

Never mind. I see what's going on now... It should be NULL, and not 0
for coding style reasons, though...

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com

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