surf_action_t(*write) (void *storage, size_t size, surf_file_t fd);
surf_action_t(*stat) (void *storage, surf_file_t fd);
surf_action_t(*ls) (void *storage, const char *path);
surf_action_t(*write) (void *storage, size_t size, surf_file_t fd);
surf_action_t(*stat) (void *storage, surf_file_t fd);
surf_action_t(*ls) (void *storage, const char *path);