netdev - Re: [PATCH v3 04/11] SUNRPC: parametrize svc creation calls with portmapper flag

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Date:	Mon, 19 Sep 2011 10:08:11 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	Trond.Myklebust@...app.com, linux-nfs@...r.kernel.org,
	xemul@...allels.com, neilb@...e.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bfields@...ldses.org,
	davem@...emloft.net
Subject: Re: [PATCH v3 04/11] SUNRPC: parametrize svc creation calls with
 portmapper flag

On Tue, 13 Sep 2011 22:13:51 +0400
Stanislav Kinsbursky <skinsbursky@...allels.com> wrote:

> This new flag ("setup_rpcbind) will be used to detect, that new service will
> send portmapper register calls. For such services we will create rpcbind
> clients and remove all stale portmap registrations.
> Also, svc_rpcb_cleanup() will be set as sv_shutdown callback for such services
> in case of this field wasn't initialized earlier. This will allow to destroy
> rpcbind clients when no other users of them left.
> 
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
> 
> ---
>  include/linux/sunrpc/svc.h |    2 ++
>  net/sunrpc/svc.c           |   21 ++++++++++++++-------
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
> index 223588a..528952a 100644
> --- a/include/linux/sunrpc/svc.h
> +++ b/include/linux/sunrpc/svc.h
> @@ -402,11 +402,13 @@ struct svc_procedure {
>   * Function prototypes.
>   */
>  struct svc_serv *svc_create(struct svc_program *, unsigned int,
> +			    int setup_rpcbind,
				^^^
			Instead of adding this parameter, why not
			base this on the vs_hidden flag in the
			svc_version? IOW, have a function that looks at
			all the svc_versions for a particular
			svc_program, and returns "true" if any of them
			have vs_hidden unset? The mechanism you're
			proposing here has the potential to be out of
			sync with the vs_hidden flag.

			Also, if you're adding an argument to a
			function like this, you you really ought to
			change the callers in the same patch. Otherwise
			you'll cause a build break if someone tries to
			bisect and ends up between the patch that
			changes the function and the one that changes
			the callers.

>  			    void (*shutdown)(struct svc_serv *));
>  struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
>  					struct svc_pool *pool);
>  void		   svc_exit_thread(struct svc_rqst *);
>  struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
> +			int setup_rpcbind,
>  			void (*shutdown)(struct svc_serv *),
>  			svc_thread_fn, struct module *);
>  int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index f31e5cc..03231d5 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -378,7 +378,7 @@ static void svc_rpcb_cleanup(struct svc_serv *serv)
>   */
>  static struct svc_serv *
>  __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
> -	     void (*shutdown)(struct svc_serv *serv))
> +	     int setup_rpcbind, void (*shutdown)(struct svc_serv *serv))
>  {
>  	struct svc_serv	*serv;
>  	unsigned int vers;
> @@ -437,29 +437,36 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
>  		spin_lock_init(&pool->sp_lock);
>  	}
>  
> -	/* Remove any stale portmap registrations */
> -	svc_unregister(serv);
> +	if (setup_rpcbind) {
> +	       	if (svc_rpcb_setup(serv) < 0) {
> +			kfree(serv->sv_pools);
> +			kfree(serv);
> +			return NULL;
> +		}
> +		if (!serv->sv_shutdown)
> +			serv->sv_shutdown = svc_rpcb_cleanup;
> +	}
>  
>  	return serv;
>  }
>  
>  struct svc_serv *
>  svc_create(struct svc_program *prog, unsigned int bufsize,
> -	   void (*shutdown)(struct svc_serv *serv))
> +	   int setup_rpcbind, void (*shutdown)(struct svc_serv *serv))
>  {
> -	return __svc_create(prog, bufsize, /*npools*/1, shutdown);
> +	return __svc_create(prog, bufsize, /*npools*/1, setup_rpcbind, shutdown);
>  }
>  EXPORT_SYMBOL_GPL(svc_create);
>  
>  struct svc_serv *
>  svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
> -		  void (*shutdown)(struct svc_serv *serv),
> +		  int setup_rpcbind, void (*shutdown)(struct svc_serv *serv),
>  		  svc_thread_fn func, struct module *mod)
>  {
>  	struct svc_serv *serv;
>  	unsigned int npools = svc_pool_map_get();
>  
> -	serv = __svc_create(prog, bufsize, npools, shutdown);
> +	serv = __svc_create(prog, bufsize, npools, setup_rpcbind, shutdown);
>  
>  	if (serv != NULL) {
>  		serv->sv_function = func;
> 
> --
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-- 
Jeff Layton <jlayton@...hat.com>
--
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