netdev - Re: [PATCH 3/5] SUNRPC: make RPC service dependable on rpcbind clients creation

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Date:	Thu, 25 Aug 2011 14:18:24 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>
CC:	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"neilb@...e.de" <neilb@...e.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH 3/5] SUNRPC: make RPC service dependable on rpcbind clients
 creation

This patch has a flaw: rpcbind clients have to be put in case of error in __svc_create().
So will be the second version.

24.08.2011 22:33, Stanislav Kinsbursky пишет:
> We create or increase users counter of rcbind clients during RPC service
> creation and decrease this counter (and possibly destroy those clients) on RPC
> service destruction.
>
> Signed-off-by: Stanislav Kinsbursky<skinsbursky@...allels.com>
>
> ---
>   include/linux/sunrpc/clnt.h |    2 ++
>   net/sunrpc/rpcb_clnt.c      |    2 +-
>   net/sunrpc/svc.c            |    5 +++++
>   3 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
> index db7bcaf..65a8115 100644
> --- a/include/linux/sunrpc/clnt.h
> +++ b/include/linux/sunrpc/clnt.h
> @@ -135,10 +135,12 @@ void		rpc_shutdown_client(struct rpc_clnt *);
>   void		rpc_release_client(struct rpc_clnt *);
>   void		rpc_task_release_client(struct rpc_task *);
>
> +int		rpcb_create_local(void);
>   int		rpcb_register(u32, u32, int, unsigned short);
>   int		rpcb_v4_register(const u32 program, const u32 version,
>   				 const struct sockaddr *address,
>   				 const char *netid);
> +void		rpcb_put_local(void);
>   void		rpcb_getport_async(struct rpc_task *);
>
>   void		rpc_call_start(struct rpc_task *);
> diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
> index b4cc0f1..437ec60 100644
> --- a/net/sunrpc/rpcb_clnt.c
> +++ b/net/sunrpc/rpcb_clnt.c
> @@ -318,7 +318,7 @@ out:
>    * Returns zero on success, otherwise a negative errno value
>    * is returned.
>    */
> -static int rpcb_create_local(void)
> +int rpcb_create_local(void)
>   {
>   	static DEFINE_MUTEX(rpcb_create_local_mutex);
>   	int result = 0;
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index 6a69a11..0df8532 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -367,6 +367,9 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
>   	unsigned int xdrsize;
>   	unsigned int i;
>
> +	if (rpcb_create_local()<  0)
> +		return NULL;
> +
>   	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
>   		return NULL;
>   	serv->sv_name      = prog->pg_name;
> @@ -491,6 +494,8 @@ svc_destroy(struct svc_serv *serv)
>   	svc_unregister(serv);
>   	kfree(serv->sv_pools);
>   	kfree(serv);
> +
> +	rpcb_put_local();
>   }
>   EXPORT_SYMBOL_GPL(svc_destroy);
>
>
> --
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-- 
Best regards,
Stanislav Kinsbursky
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