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Subject[patch 5/13] Allow multiple programs to share the same transport
Allow a clone of an RPC client (created with rpc_clone_client()) to
change to another program. This allows the NFS and NFSACL programs to
share the same transport.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Olaf Kirch <okir@suse.de>

Index: linux-2.6.11-rc2/include/linux/sunrpc/clnt.h
===================================================================
--- linux-2.6.11-rc2.orig/include/linux/sunrpc/clnt.h
+++ linux-2.6.11-rc2/include/linux/sunrpc/clnt.h
@@ -22,6 +22,7 @@
* This defines an RPC port mapping
*/
struct rpc_portmap {
+ struct rpc_portmap *pm_parent;
__u32 pm_prog;
__u32 pm_vers;
__u32 pm_prot;
@@ -116,6 +117,8 @@ struct rpc_clnt *rpc_clone_client(struct
int rpc_shutdown_client(struct rpc_clnt *);
int rpc_destroy_client(struct rpc_clnt *);
void rpc_release_client(struct rpc_clnt *);
+void rpc_change_program(struct rpc_clnt *, struct rpc_program *,
+ int);
void rpc_getport(struct rpc_task *, struct rpc_clnt *);
int rpc_register(u32, u32, int, unsigned short, int *);

Index: linux-2.6.11-rc2/net/sunrpc/clnt.c
===================================================================
--- linux-2.6.11-rc2.orig/net/sunrpc/clnt.c
+++ linux-2.6.11-rc2/net/sunrpc/clnt.c
@@ -139,6 +139,7 @@ rpc_create_client(struct rpc_xprt *xprt,
clnt->cl_maxproc = version->nrprocs;
clnt->cl_protname = program->name;
clnt->cl_pmap = &clnt->cl_pmap_default;
+ clnt->cl_pmap->pm_parent = clnt->cl_pmap;
clnt->cl_port = xprt->addr.sin_port;
clnt->cl_prog = program->number;
clnt->cl_vers = version->number;
@@ -207,6 +208,9 @@ rpc_clone_client(struct rpc_clnt *clnt)
rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
if (new->cl_auth)
atomic_inc(&new->cl_auth->au_count);
+ new->cl_pmap = &new->cl_pmap_default;
+ new->cl_pmap->pm_parent = clnt->cl_pmap->pm_parent;
+ rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
return new;
out_no_clnt:
printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
@@ -296,6 +300,25 @@ rpc_release_client(struct rpc_clnt *clnt
}

/*
+ * Change the program of a (usually cloned) client
+ */
+void
+rpc_change_program(struct rpc_clnt *clnt, struct rpc_program *program,
+ int vers)
+{
+ struct rpc_version *version;
+
+ BUG_ON(vers >= program->nrvers || !program->version[vers]);
+ version = program->version[vers];
+ clnt->cl_procinfo = version->procs;
+ clnt->cl_maxproc = version->nrprocs;
+ clnt->cl_protname = program->name;
+ clnt->cl_prog = program->number;
+ clnt->cl_vers = version->number;
+ clnt->cl_stats = program->stats;
+}
+
+/*
* Default callback for async RPC calls
*/
static void
Index: linux-2.6.11-rc2/net/sunrpc/pmap_clnt.c
===================================================================
--- linux-2.6.11-rc2.orig/net/sunrpc/pmap_clnt.c
+++ linux-2.6.11-rc2/net/sunrpc/pmap_clnt.c
@@ -41,7 +41,7 @@ static DEFINE_SPINLOCK(pmap_lock);
void
rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
{
- struct rpc_portmap *map = clnt->cl_pmap;
+ struct rpc_portmap *map = clnt->cl_pmap->pm_parent;
struct sockaddr_in *sap = &clnt->cl_xprt->addr;
struct rpc_message msg = {
.rpc_proc = &pmap_procedures[PMAP_GETPORT],
@@ -132,7 +132,7 @@ static void
pmap_getport_done(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
- struct rpc_portmap *map = clnt->cl_pmap;
+ struct rpc_portmap *map = clnt->cl_pmap->pm_parent;

dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
task->tk_pid, task->tk_status, clnt->cl_port);
Index: linux-2.6.11-rc2/net/sunrpc/sunrpc_syms.c
===================================================================
--- linux-2.6.11-rc2.orig/net/sunrpc/sunrpc_syms.c
+++ linux-2.6.11-rc2/net/sunrpc/sunrpc_syms.c
@@ -42,6 +42,7 @@ EXPORT_SYMBOL(rpc_release_task);
/* RPC client functions */
EXPORT_SYMBOL(rpc_create_client);
EXPORT_SYMBOL(rpc_clone_client);
+EXPORT_SYMBOL(rpc_change_program);
EXPORT_SYMBOL(rpc_destroy_client);
EXPORT_SYMBOL(rpc_shutdown_client);
EXPORT_SYMBOL(rpc_release_client);
--
Andreas Gruenbacher <agruen@suse.de>
SUSE Labs, SUSE LINUX PRODUCTS GMBH

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