9p: VFS switches for 9p2000.L: protocol and client changes

Prepare p9pdu_read/write functions to handle multiple protocols.
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

net/9p/client.c

@@ -1321,7 +1321,8 @@ static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
 	if (wst->muid)
 		ret += strlen(wst->muid);
 
-	if (proto_version == p9_proto_2000u) {
+	if ((proto_version == p9_proto_2000u) ||
+		(proto_version == p9_proto_2000L)) {
 		ret += 2+4+4+4;	/* extension[s] n_uid[4] n_gid[4] n_muid[4] */
 		if (wst->extension)
 			ret += strlen(wst->extension);

net/9p/protocol.c

@@ -341,7 +341,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
 			}
 			break;
 		case '?':
-			if (proto_version != p9_proto_2000u)
+			if ((proto_version != p9_proto_2000u) &&
+				(proto_version != p9_proto_2000L))
 				return 0;
 			break;
 		default:
@@ -488,7 +489,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
 			}
 			break;
 		case '?':
-			if (proto_version != p9_proto_2000u)
+			if ((proto_version != p9_proto_2000u) &&
+				(proto_version != p9_proto_2000L))
 				return 0;
 			break;
 		default: