fs/zfs/refcount.c

63 refcount_create(refcount_t *rc)
65 	mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
66 	list_create(&rc->rc_list, sizeof (reference_t),
68 	list_create(&rc->rc_removed, sizeof (reference_t),
70 	rc->rc_count = 0;
71 	rc->rc_removed_count = 0;
72 	rc->rc_tracked = reference_tracking_enable;
76 refcount_create_tracked(refcount_t *rc)
78 	refcount_create(rc);
79 	rc->rc_tracked = B_TRUE;
83 refcount_create_untracked(refcount_t *rc)
85 	refcount_create(rc);
86 	rc->rc_tracked = B_FALSE;
90 refcount_destroy_many(refcount_t *rc, uint64_t number)
94 	ASSERT(rc->rc_count == number);
95 	while (ref = list_head(&rc->rc_list)) {
96 		list_remove(&rc->rc_list, ref);
99 	list_destroy(&rc->rc_list);
101 	while (ref = list_head(&rc->rc_removed)) {
102 		list_remove(&rc->rc_removed, ref);
106 	list_destroy(&rc->rc_removed);
107 	mutex_destroy(&rc->rc_mtx);
111 refcount_destroy(refcount_t *rc)
113 	refcount_destroy_many(rc, 0);
117 refcount_is_zero(refcount_t *rc)
119 	return (rc->rc_count == 0);
123 refcount_count(refcount_t *rc)
125 	return (rc->rc_count);
129 refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
134 	if (rc->rc_tracked) {
139 	mutex_enter(&rc->rc_mtx);
140 	ASSERT(rc->rc_count >= 0);
141 	if (rc->rc_tracked)
142 		list_insert_head(&rc->rc_list, ref);
143 	rc->rc_count += number;
144 	count = rc->rc_count;
145 	mutex_exit(&rc->rc_mtx);
151 refcount_add(refcount_t *rc, void *holder)
153 	return (refcount_add_many(rc, 1, holder));
157 refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
162 	mutex_enter(&rc->rc_mtx);
163 	ASSERT(rc->rc_count >= number);
165 	if (!rc->rc_tracked) {
166 		rc->rc_count -= number;
167 		count = rc->rc_count;
168 		mutex_exit(&rc->rc_mtx);
172 	for (ref = list_head(&rc->rc_list); ref;
173 	    ref = list_next(&rc->rc_list, ref)) {
175 			list_remove(&rc->rc_list, ref);
180 				list_insert_head(&rc->rc_removed, ref);
181 				rc->rc_removed_count++;
182 				if (rc->rc_removed_count > reference_history) {
183 					ref = list_tail(&rc->rc_removed);
184 					list_remove(&rc->rc_removed, ref);
188 					rc->rc_removed_count--;
193 			rc->rc_count -= number;
194 			count = rc->rc_count;
195 			mutex_exit(&rc->rc_mtx);
200 	    (u_longlong_t)(uintptr_t)rc);
205 refcount_remove(refcount_t *rc, void *holder)
207 	return (refcount_remove_many(rc, 1, holder));
242 refcount_transfer_ownership(refcount_t *rc, void *current_holder,
248 	mutex_enter(&rc->rc_mtx);
249 	if (!rc->rc_tracked) {
250 		mutex_exit(&rc->rc_mtx);
254 	for (ref = list_head(&rc->rc_list); ref;
255 	    ref = list_next(&rc->rc_list, ref)) {
263 	mutex_exit(&rc->rc_mtx);
272 refcount_held(refcount_t *rc, void *holder)
276 	mutex_enter(&rc->rc_mtx);
278 	if (!rc->rc_tracked) {
279 		mutex_exit(&rc->rc_mtx);
280 		return (rc->rc_count > 0);
283 	for (ref = list_head(&rc->rc_list); ref;
284 	    ref = list_next(&rc->rc_list, ref)) {
286 			mutex_exit(&rc->rc_mtx);
290 	mutex_exit(&rc->rc_mtx);
300 refcount_not_held(refcount_t *rc, void *holder)
304 	mutex_enter(&rc->rc_mtx);
306 	if (!rc->rc_tracked) {
307 		mutex_exit(&rc->rc_mtx);
311 	for (ref = list_head(&rc->rc_list); ref;
312 	    ref = list_next(&rc->rc_list, ref)) {
314 			mutex_exit(&rc->rc_mtx);
318 	mutex_exit(&rc->rc_mtx);