Function zfs_refcount_not_held

freebsd/contrib/openzfs/module/zfs/refcount.c:305–326

* If tracking is enabled, return true if a reference does not exist that * matches the "holder" tag. If tracking is disabled, always return true * since the reference might not be held. */

 * since the reference might not be held.
 */
boolean_t
zfs_refcount_not_held(zfs_refcount_t *rc, const void *holder)
{
	reference_t *ref;

	mutex_enter(&rc->rc_mtx);

	if (!rc->rc_tracked) {
		mutex_exit(&rc->rc_mtx);
		return (B_TRUE);
	}

	for (ref = list_head(&rc->rc_list); ref;
	    ref = list_next(&rc->rc_list, ref)) {
		if (ref->ref_holder == holder) {
			mutex_exit(&rc->rc_mtx);
			return (B_FALSE);
		}
	}
	mutex_exit(&rc->rc_mtx);
	return (B_TRUE);
}
#endif	/* ZFS_DEBUG */