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

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Message-ID: <20111129172702.GB19528@fieldses.org>
Date:	Tue, 29 Nov 2011 12:27:02 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Peng Tao <bergwolf@...il.com>, tao.peng@....com,
	skinsbursky@...allels.com, linux-nfs@...r.kernel.org,
	xemul@...allels.com, neilb@...e.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, jbottomley@...allels.com,
	davem@...emloft.net, devel@...nvz.org
Subject: Re: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference from
 blocklayout routines

On Tue, Nov 29, 2011 at 12:19:25PM -0500, Trond Myklebust wrote:
> On Tue, 2011-11-29 at 11:42 -0500, J. Bruce Fields wrote: 
> > On Tue, Nov 29, 2011 at 11:40:30AM -0500, Trond Myklebust wrote:
> > > I mean that I'm perfectly entitled to do
> > > 
> > > 'modprobe -r blocklayoutdriver'
> > > 
> > > and when I do that, then I expect blkmapd to close the rpc pipe and wait
> > > for a new one to be created just like rpc.idmapd and rpc.gssd do when I
> > > remove the nfs and sunrpc modules.
> > 
> > The rpc pipefs mount doesn't hold a reference on the sunrpc module?
> 
> I stand corrected: the mount does hold a reference to the sunrpc
> module. 
> However nothing holds a reference to the blocklayoutdriver module, so
> the main point that the "blocklayout" pipe can disappear from underneath
> the blkmapd stands.

OK, that makes sense.

--b.
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