dfs_root_xopen
static int dfs_root_xopen(const char *, int);
if ((xfd = dfs_root_xopen(rootdir, O_CREAT | O_TRUNC | O_RDWR)) > 0) {
if ((xfd = dfs_root_xopen(rootdir, O_RDONLY)) > 0) {
if ((xfd = dfs_root_xopen(rootdir, O_RDWR)) < 0) {