linux-kernel - Re: [PATCH 0/3] lockd: use per-net refrence-counted NSM clients

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Message-Id: <4030B8F9-5C67-4AE7-826E-B4B6AD4FAD01@oracle.com>
Date:	Fri, 14 Sep 2012 13:01:21 -0400
From:	Chuck Lever <chuck.lever@...cle.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"devel@...nvz.org" <devel@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jlayton@...hat.com" <jlayton@...hat.com>
Subject: Re: [PATCH 0/3] lockd: use per-net refrence-counted NSM clients

What happens if statd is restarted?

Sent from my iPhone

On Sep 14, 2012, at 10:25 AM, Stanislav Kinsbursky <skinsbursky@...allels.com> wrote:

> This is a bug fix for https://bugzilla.redhat.com/show_bug.cgi?id=830862.
> 
> The problem is that with NFSv4 mount in container (with separated mount
> namesapce) and active lock on it, dying child reaped of this container will
> try to umount NFS and doing this will try to create RPC client to send
> unmonitor request to statd.
> But creation of RCP client requires valid current->nsproxy (for operation with
> utsname()) and during umount on child reaper exit it's equal to zero.
> 
> Proposed solution is to introduce refrence-counter per-net NSM client, which
> is created on fist monitor call and destroyed after the lst monitor call.
> 
> The following series implements...
> 
> ---
> 
> Stanislav Kinsbursky (3):
>      lockd: use rpc client's cl_nodename for id encoding
>      lockd: per-net NSM client creation and destruction helpers introduced
>      lockd: create and use per-net NSM RPC clients on MON/UNMON requests
> 
> 
> fs/lockd/mon.c   |   91 +++++++++++++++++++++++++++++++++++++++++++-----------
> fs/lockd/netns.h |    4 ++
> fs/lockd/svc.c   |    1 +
> 3 files changed, 77 insertions(+), 19 deletions(-)
> 
> 
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