linux-kernel - Re: [PATCH 11/14] nfs: idr_destroy() no longer needs idr_remove

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Date:	Wed, 30 Jan 2013 02:18:06 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Tejun Heo <tj@...nel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"Myklebust, Trond" <Trond.Myklebust@...app.com>
Subject: Re: [PATCH 11/14] nfs: idr_destroy() no longer needs
 idr_remove_all()

On Tue, 2013-01-29 at 17:58 -0500, J. Bruce Fields wrote:
> On Fri, Jan 25, 2013 at 05:31:09PM -0800, Tejun Heo wrote:
> > idr_destroy() can destroy idr by itself and idr_remove_all() is being
> > deprecated.  Drop reference to idr_remove_all().  Note that the code
> > wasn't completely correct before because idr_remove() on all entries
> > doesn't necessarily release all idr_layers which could lead to memory
> > leak.
> 
> Seems fine, but actually this is client-side so I think you meant the cc
> to be to Trond.

Acked-by: Trond Myklebust <Trond.Myklebust@...app.com>

No problems whatsoever with removing a comment. :-)

My worry is more about Tejun's comment that we did actually need a call
to idr_remove_all() in the original code. Do we need to queue up a fix
for the 3.8 and existing stable kernels?

Cheers
  Trond

> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > Cc: "J. Bruce Fields" <bfields@...ldses.org>
> > Cc: linux-nfs@...r.kernel.org
> > ---
> > This patch depends on an earlier idr patch and given the trivial
> > nature of the patch, I think it would be best to route these together
> > through -mm.  Please holler if there's any objection.
> > 
> > Thanks.
> > 
> >  fs/nfs/client.c | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> > index 9f3c664..84d8eae 100644
> > --- a/fs/nfs/client.c
> > +++ b/fs/nfs/client.c
> > @@ -197,7 +197,6 @@ error_0:
> >  EXPORT_SYMBOL_GPL(nfs_alloc_client);
> >  
> >  #if IS_ENABLED(CONFIG_NFS_V4)
> > -/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
> >  void nfs_cleanup_cb_ident_idr(struct net *net)
> >  {
> >  	struct nfs_net *nn = net_generic(net, nfs_net_id);
> > -- 
> > 1.8.1
> > 

-- 
Trond Myklebust
Linux NFS client maintainer

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