linux-kernel - Re: [PATCH v2] lockd: get rid of reference-counted NSM RPC clients

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Message-ID: <CAHQdGtQNVhqiEx2NytJDkHt+AtYUw6+_JT0q0L0+uZVBaSXT+Q@mail.gmail.com>
Date:	Wed, 7 Oct 2015 17:45:15 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	Anna Schumaker <anna.schumaker@...app.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stanislav Kinsbursky <skinsbursky@...tuozzo.com>,
	kbuild test robot <lkp@...el.com>, kbuild-all@...org
Subject: Re: [PATCH v2] lockd: get rid of reference-counted NSM RPC clients

On Wed, Oct 7, 2015 at 7:39 AM, Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
> Currently we have reference-counted per-net NSM RPC client
> which created on the first monitor request and destroyed
> after the last unmonitor request. It's needed because
> RPC client need to know 'utsname()->nodename', but utsname()
> might be NULL when nsm_unmonitor() called.
>

The other reason for keeping the rpc_client around is to avoid a need
to do portmapper/rpcbind lookups in a net namespace that may be in the
process of shutting down. This patchset will reintroduce that
requirement.

Cheers
  Trond
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