fs/zfs/refcount.c

64 refcount_create(refcount_t *rc)
66 	mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
67 	list_create(&rc->rc_list, sizeof (reference_t),
69 	list_create(&rc->rc_removed, sizeof (reference_t),
71 	rc->rc_count = 0;
72 	rc->rc_removed_count = 0;
73 	rc->rc_tracked = reference_tracking_enable;
77 refcount_create_tracked(refcount_t *rc)
79 	refcount_create(rc);
80 	rc->rc_tracked = B_TRUE;
84 refcount_create_untracked(refcount_t *rc)
86 	refcount_create(rc);
87 	rc->rc_tracked = B_FALSE;
91 refcount_destroy_many(refcount_t *rc, uint64_t number)
95 	ASSERT(rc->rc_count == number);
96 	while (ref = list_head(&rc->rc_list)) {
97 		list_remove(&rc->rc_list, ref);
100 	list_destroy(&rc->rc_list);
102 	while (ref = list_head(&rc->rc_removed)) {
103 		list_remove(&rc->rc_removed, ref);
107 	list_destroy(&rc->rc_removed);
108 	mutex_destroy(&rc->rc_mtx);
112 refcount_destroy(refcount_t *rc)
114 	refcount_destroy_many(rc, 0);
118 refcount_is_zero(refcount_t *rc)
120 	return (rc->rc_count == 0);
124 refcount_count(refcount_t *rc)
126 	return (rc->rc_count);
130 refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
135 	if (rc->rc_tracked) {
140 	mutex_enter(&rc->rc_mtx);
141 	ASSERT(rc->rc_count >= 0);
142 	if (rc->rc_tracked)
143 		list_insert_head(&rc->rc_list, ref);
144 	rc->rc_count += number;
145 	count = rc->rc_count;
146 	mutex_exit(&rc->rc_mtx);
152 refcount_add(refcount_t *rc, void *holder)
154 	return (refcount_add_many(rc, 1, holder));
158 refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
163 	mutex_enter(&rc->rc_mtx);
164 	ASSERT(rc->rc_count >= number);
166 	if (!rc->rc_tracked) {
167 		rc->rc_count -= number;
168 		count = rc->rc_count;
169 		mutex_exit(&rc->rc_mtx);
173 	for (ref = list_head(&rc->rc_list); ref;
174 	    ref = list_next(&rc->rc_list, ref)) {
176 			list_remove(&rc->rc_list, ref);
181 				list_insert_head(&rc->rc_removed, ref);
182 				rc->rc_removed_count++;
183 				if (rc->rc_removed_count > reference_history) {
184 					ref = list_tail(&rc->rc_removed);
185 					list_remove(&rc->rc_removed, ref);
189 					rc->rc_removed_count--;
194 			rc->rc_count -= number;
195 			count = rc->rc_count;
196 			mutex_exit(&rc->rc_mtx);
201 	    (u_longlong_t)(uintptr_t)rc);
206 refcount_remove(refcount_t *rc, void *holder)
208 	return (refcount_remove_many(rc, 1, holder));
243 refcount_transfer_ownership(refcount_t *rc, void *current_holder,
249 	mutex_enter(&rc->rc_mtx);
250 	if (!rc->rc_tracked) {
251 		mutex_exit(&rc->rc_mtx);
255 	for (ref = list_head(&rc->rc_list); ref;
256 	    ref = list_next(&rc->rc_list, ref)) {
264 	mutex_exit(&rc->rc_mtx);
273 refcount_held(refcount_t *rc, void *holder)
277 	mutex_enter(&rc->rc_mtx);
279 	if (!rc->rc_tracked) {
280 		mutex_exit(&rc->rc_mtx);
281 		return (rc->rc_count > 0);
284 	for (ref = list_head(&rc->rc_list); ref;
285 	    ref = list_next(&rc->rc_list, ref)) {
287 			mutex_exit(&rc->rc_mtx);
291 	mutex_exit(&rc->rc_mtx);
301 refcount_not_held(refcount_t *rc, void *holder)
305 	mutex_enter(&rc->rc_mtx);
307 	if (!rc->rc_tracked) {
308 		mutex_exit(&rc->rc_mtx);
312 	for (ref = list_head(&rc->rc_list); ref;
313 	    ref = list_next(&rc->rc_list, ref)) {
315 			mutex_exit(&rc->rc_mtx);
319 	mutex_exit(&rc->rc_mtx);