NFS: Use proper naming conventions for nfs_client.impl_id field

Clean up:  When naming fields and data types, follow established
conventions to facilitate accurate grep/cscope searches.

Additionally, for consistency, move the impl_id field into the NFSv4-
specific part of the nfs_client, and free that memory in the logic
that shuts down NFSv4 nfs_clients.

Introduced by commit 7d2ed9ac "NFSv4: parse and display server
implementation ids," Fri Feb 17, 2012.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/client.c

@@ -238,6 +238,7 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 
 	rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 	kfree(clp->cl_serverscope);
+	kfree(clp->cl_implid);
 }
 
 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */
@@ -306,7 +307,6 @@ static void nfs_free_client(struct nfs_client *clp)
 
 	put_net(clp->net);
 	kfree(clp->cl_hostname);
-	kfree(clp->impl_id);
 	kfree(clp);
 
 	dprintk("<-- nfs_free_client()\n");

fs/nfs/nfs4proc.c

@@ -5119,8 +5119,8 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 
 	if (!status) {
 		/* use the most recent implementation id */
-		kfree(clp->impl_id);
-		clp->impl_id = res.impl_id;
+		kfree(clp->cl_implid);
+		clp->cl_implid = res.impl_id;
 	} else
 		kfree(res.impl_id);
 
@@ -5144,12 +5144,12 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 out_server_scope:
 	kfree(res.server_scope);
 out:
-	if (clp->impl_id)
+	if (clp->cl_implid)
 		dprintk("%s: Server Implementation ID: "
 			"domain: %s, name: %s, date: %llu,%u\n",
-			__func__, clp->impl_id->domain, clp->impl_id->name,
-			clp->impl_id->date.seconds,
-			clp->impl_id->date.nseconds);
+			__func__, clp->cl_implid->domain, clp->cl_implid->name,
+			clp->cl_implid->date.seconds,
+			clp->cl_implid->date.nseconds);
 	dprintk("<-- %s status= %d\n", __func__, status);
 	return status;
 }

fs/nfs/super.c

@@ -796,8 +796,8 @@ static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 
 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
 {
-	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
-		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
+	if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
+		struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
 		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
 			   "date='%llu,%u'",
 			   impl_id->name, impl_id->domain,

include/linux/nfs_fs_sb.h

@@ -81,13 +81,13 @@ struct nfs_client {
 	u32			cl_exchange_flags;
 	struct nfs4_session	*cl_session;	/* shared session */
 	struct nfs41_server_scope *cl_serverscope;
+	struct nfs41_impl_id	*cl_implid;
 #endif /* CONFIG_NFS_V4 */
 
 #ifdef CONFIG_NFS_FSCACHE
 	struct fscache_cookie	*fscache;	/* client index cache cookie */
 #endif
 
-	struct nfs41_impl_id	*impl_id;	/* from exchange_id */
 	struct net		*net;
 };