dorename
dorename(&msg, oldname, newname, MAXDRIVENAME);
dorename(&msg, oldname, newname, MAXSDNAME);
dorename(&msg, oldname, newname, MAXPLEXNAME);
dorename(&msg, sd.name, sdname, MAXSDNAME);
dorename(&msg, oldname, newname, MAXVOLNAME);
dorename(&msg, plex.name, plexname, MAXPLEXNAME);
dorename(&msg, sd.name, sdname, MAXSDNAME);
static void dorename(struct vinum_rename_msg *msg, const char *oldname, const char *name, int maxlen);