po_rightmost_t po_rightmost(struct mount_options *, char *, char *);
po_found_t po_remove_all(struct mount_options *, char *);
void po_destroy(struct mount_options *);
po_rightmost_t po_rightmost(struct mount_options *, char *, char *);
po_found_t po_remove_all(struct mount_options *, char *);
void po_destroy(struct mount_options *);