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

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Message-ID: <20110824183359.4924.94364.stgit@localhost6.localdomain6>
Date:	Wed, 24 Aug 2011 22:33:59 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Trond.Myklebust@...app.com
Cc:	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: [PATCH 3/5] SUNRPC: make RPC service dependable on rpcbind clients
	creation

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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