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Sender: Anna Schumaker <schumakeranna@gmail.com>
From:   schumaker.anna@gmail.com
To:     linux-nfs@vger.kernel.org
Cc:     Anna.Schumaker@Netapp.com
Subject: [RFC PATCH 3/7] sunrpc: Create a net/ subdirectory in the sunrpc sysfs
Date:   Mon, 11 Jan 2021 16:41:39 -0500
Message-Id: <20210111214143.553479-4-Anna.Schumaker@Netapp.com>
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From: Anna Schumaker <Anna.Schumaker@Netapp.com>

For network namespace separation.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 net/sunrpc/sysfs.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index efff6977095c..afeaec79a9c7 100644
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -4,18 +4,57 @@
  */
 #include <net/sock.h>
 
-//struct kobject *rpc_client_kobj;
+struct kobject *rpc_client_kobj;
 static struct kset *rpc_client_kset;
 
+static void rpc_netns_object_release(struct kobject *kobj)
+{
+	kfree(kobj);
+}
+
+static const struct kobj_ns_type_operations *rpc_netns_object_child_ns_type(
+		struct kobject *kobj)
+{
+	return &net_ns_type_operations;
+}
+
+static struct kobj_type rpc_netns_object_type = {
+	.release = rpc_netns_object_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.child_ns_type = rpc_netns_object_child_ns_type,
+};
+
+static struct kobject *rpc_netns_object_alloc(const char *name,
+		struct kset *kset, struct kobject *parent)
+{
+	struct kobject *kobj;
+	kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
+	if (kobj) {
+		kobj->kset = kset;
+		if (kobject_init_and_add(kobj, &rpc_netns_object_type,
+					parent, "%s", name) == 0)
+			return kobj;
+		kobject_put(kobj);
+	}
+	return NULL;
+}
+
 int rpc_sysfs_init(void)
 {
 	rpc_client_kset = kset_create_and_add("sunrpc", NULL, net_kobj);
 	if (!rpc_client_kset)
 		return -ENOMEM;
+	rpc_client_kobj = rpc_netns_object_alloc("net", rpc_client_kset, NULL);
+	if (!rpc_client_kobj) {
+		kset_unregister(rpc_client_kset);
+		rpc_client_kset = NULL;
+		return -ENOMEM;
+	}
 	return 0;
 }
 
 void rpc_sysfs_exit(void)
 {
+	kobject_put(rpc_client_kobj);
 	kset_unregister(rpc_client_kset);
 }
-- 
2.29.2