SUNRPC: Make RPC portmapper use per-transport storage

Move connection and bind state that was maintained in the rpc_clnt
structure to the rpc_xprt structure.  This will allow the creation of
a clean API for plugging in different types of bind mechanisms.

This brings improvements such as the elimination of a single spin lock to
control serialization for all in-kernel RPC binding.  A set of per-xprt
bitops is used to serialize tasks during RPC binding, just like it now
works for making RPC transport connections.

Test-plan:
Destructive testing (unplugging the network temporarily).  Connectathon
with UDP and TCP.  NFSv2/3 and NFSv4 mounting should be carefully checked.
Probably need to rig a server where certain services aren't running, or
that returns an error for some typical operation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 0b8d03d08561..cee504162a3f 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -147,13 +147,10 @@ rpc_new_client(struct rpc_xprt *xprt, char *servname,
         clnt->cl_procinfo = version->procs;
         clnt->cl_maxproc  = version->nrprocs;
         clnt->cl_protname = program->name;
-        clnt->cl_pmap     = &clnt->cl_pmap_default;
         clnt->cl_prog     = program->number;
         clnt->cl_vers     = version->number;
-        clnt->cl_prot     = xprt->prot;
         clnt->cl_stats    = program->stats;
         clnt->cl_metrics  = rpc_alloc_iostats(clnt);
-        rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
 
         if (!xprt_bound(clnt->cl_xprt))
                 clnt->cl_autobind = 1;
@@ -243,8 +240,6 @@ rpc_clone_client(struct rpc_clnt *clnt)
         atomic_set(&new->cl_users, 0);
         new->cl_parent = clnt;
         atomic_inc(&clnt->cl_count);
-        /* Duplicate portmapper */
-        rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
         /* Turn off autobind on clones */
         new->cl_autobind = 0;
         new->cl_oneshot = 0;
@@ -254,8 +249,7 @@ 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_metrics         = rpc_alloc_iostats(clnt);
+        new->cl_metrics = rpc_alloc_iostats(clnt);
         return new;
 out_no_clnt:
         printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);