Method get_random_sub

src/client/SyntheticClient.h:147–160

  }
  filepath n2;
  const char *get_random_sub() {
    ceph_assert(!contents.empty());
    int r = ((rand() % contents.size()) + (rand() % contents.size())) / 2;  // non-uniform distn
    if (cwd.depth() && cwd.last_dentry().length()) 
      r += cwd.last_dentry().c_str()[0];                                         // slightly permuted
    r %= contents.size();

    std::map<std::string,struct stat*>::iterator it = contents.begin();
    while (r--) ++it;

    n2 = cwd;
    n2.push_dentry( it->first );
    return n2.get_path().c_str();
  }
  
  filepath sub;
  char sub_s[50];