guestfs_readdir: Note that this suffers from protocol limits.

TODO

@@ -564,3 +564,5 @@ These would be changed from daemon_functions to non_daemon_functions,
 with the non-daemon versions implemented using guestfs_upload and
 guestfs_download (and others).  This change should be transparent from
 the p.o.v of the API and ABI.
+
+ - guestfs_readdir

generator/generator_actions.ml

@@ -5083,6 +5083,7 @@ This call returns the previous umask." };
     name = "readdir";
     style = RStructList ("entries", "dirent"), [Pathname "dir"], [];
     proc_nr = Some 138;
+    protocol_limit_warning = true;
     shortdesc = "read directories entries";
     longdesc = "\
 This returns the list of directory entries in directory C<dir>.