SUNRPC: Give cloned RPC clients their own rpc_pipefs directory

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/clnt.h

@@ -53,6 +53,7 @@ struct rpc_clnt {
 	struct dentry *		cl_dentry;	/* inode */
 	struct rpc_clnt *	cl_parent;	/* Points to parent of clones */
 	struct rpc_rtt		cl_rtt_default;
+	struct rpc_program *	cl_program;
 	char			cl_inline_name[32];
 };
 

net/sunrpc/clnt.c

@@ -144,6 +144,7 @@ static struct rpc_clnt * rpc_new_client(struct rpc_xprt *xprt, char *servname, s
 	err = -ENOMEM;
 	if (clnt->cl_metrics == NULL)
 		goto out_no_stats;
+	clnt->cl_program  = program;
 
 	if (!xprt_bound(clnt->cl_xprt))
 		clnt->cl_autobind = 1;
@@ -257,6 +258,7 @@ struct rpc_clnt *
 rpc_clone_client(struct rpc_clnt *clnt)
 {
 	struct rpc_clnt *new;
+	int err = -ENOMEM;
 
 	new = kmemdup(clnt, sizeof(*new), GFP_KERNEL);
 	if (!new)
@@ -266,6 +268,9 @@ rpc_clone_client(struct rpc_clnt *clnt)
 	new->cl_metrics = rpc_alloc_iostats(clnt);
 	if (new->cl_metrics == NULL)
 		goto out_no_stats;
+	err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
+	if (err != 0)
+		goto out_no_path;
 	new->cl_parent = clnt;
 	atomic_inc(&clnt->cl_count);
 	new->cl_xprt = xprt_get(clnt->cl_xprt);
@@ -273,17 +278,17 @@ rpc_clone_client(struct rpc_clnt *clnt)
 	new->cl_autobind = 0;
 	new->cl_oneshot = 0;
 	new->cl_dead = 0;
-	if (!IS_ERR(new->cl_dentry))
-		dget(new->cl_dentry);
 	rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
 	if (new->cl_auth)
 		atomic_inc(&new->cl_auth->au_count);
 	return new;
+out_no_path:
+	rpc_free_iostats(new->cl_metrics);
 out_no_stats:
 	kfree(new);
 out_no_clnt:
-	printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
-	return ERR_PTR(-ENOMEM);
+	dprintk("RPC: %s returned error %d\n", __FUNCTION__, err);
+	return ERR_PTR(err);
 }
 
 /*
@@ -336,16 +341,14 @@ rpc_destroy_client(struct rpc_clnt *clnt)
 		rpcauth_destroy(clnt->cl_auth);
 		clnt->cl_auth = NULL;
 	}
-	if (clnt->cl_parent != clnt) {
-		if (!IS_ERR(clnt->cl_dentry))
-			dput(clnt->cl_dentry);
-		rpc_destroy_client(clnt->cl_parent);
-		goto out_free;
-	}
 	if (!IS_ERR(clnt->cl_dentry)) {
 		rpc_rmdir(clnt->cl_dentry);
 		rpc_put_mount();
 	}
+	if (clnt->cl_parent != clnt) {
+		rpc_destroy_client(clnt->cl_parent);
+		goto out_free;
+	}
 	if (clnt->cl_server != clnt->cl_inline_name)
 		kfree(clnt->cl_server);
 out_free: