Revert "NFSv4: use unique client identifiers in network namespaces"

This reverts commit 50c790a0.

The functionality is believed to be capable of causing regressions in
existing setups, so the author has requested that it be reverted.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/sysfs.c

@@ -151,18 +151,6 @@ static struct kobj_type nfs_netns_client_type = {
 	.namespace = nfs_netns_client_namespace,
 };
 
-static void assign_unique_clientid(struct nfs_netns_client *clp)
-{
-	unsigned char client_uuid[16];
-	char *uuid_str = kmalloc(UUID_STRING_LEN + 1, GFP_KERNEL);
-
-	if (uuid_str) {
-		generate_random_uuid(client_uuid);
-		sprintf(uuid_str, "%pU", client_uuid);
-		rcu_assign_pointer(clp->identifier, uuid_str);
-	}
-}
-
 static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
 		struct net *net)
 {
@@ -170,8 +158,6 @@ static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
 
 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (p) {
-		if (net != &init_net)
-			assign_unique_clientid(p);
 		p->net = net;
 		p->kobject.kset = nfs_client_kset;
 		if (kobject_init_and_add(&p->kobject, &nfs_netns_client_type,