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

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Message-ID: <CA+a=Yy4bEKaeUihjYLRzXVbjA3fc2EuZ3ToAkf0w-oL3PnZJKQ@mail.gmail.com>
Date:	Wed, 30 Nov 2011 01:30:27 +0800
From:	Peng Tao <bergwolf@...il.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>, 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 Wed, Nov 30, 2011 at 1:19 AM, Trond Myklebust
<Trond.Myklebust@...app.com> 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.
Thanks for the explanation and I agree it can cause problem if user
reload blocklayout module. I will look into a fix to blkmapd.

Best,
Tao
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