netdev - Re: [PATCH v6 4/8] SUNRPC: setup rpcbind clients if service requires it

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Date:	Thu, 27 Oct 2011 17:27:32 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
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, davem@...emloft.net, devel@...nvz.org
Subject: Re: [PATCH v6 4/8] SUNRPC: setup rpcbind clients if service
 requires it

On Tue, Oct 25, 2011 at 02:17:08PM +0300, Stanislav Kinsbursky wrote:
> New function ("svc_uses_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.
> 
> Note: Currently, any creating service will be detected as portmap user.
> Probably, this is wrong. But now it depends on program versions "vs_hidden"
> flag.
> 
> Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
> 
> ---
>  net/sunrpc/svc.c |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index d2d61bf..918edc3 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -454,8 +454,15 @@ __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 (svc_uses_rpcbind(serv)) {
> +	       	if (svc_rpcb_setup(serv) < 0) {
> +			kfree(serv->sv_pools);
> +			kfree(serv);
> +			return NULL;

Nit: could we convert this (and the previous failure to allocate
sv_pools) to the usual pattern of collecting the cleanup at the end and
jumping to it with a goto?

Looks fine otherwise.

--b.

> +		}
> +		if (!serv->sv_shutdown)
> +			serv->sv_shutdown = svc_rpcb_cleanup;
> +	}
>  
>  	return serv;
>  }
> 
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