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_untracked(refcount_t *rc)
78 	refcount_create(rc);
79 	rc->rc_tracked = B_FALSE;
83 refcount_destroy_many(refcount_t *rc, uint64_t number)
87 	ASSERT(rc->rc_count == number);
88 	while (ref = list_head(&rc->rc_list)) {
89 		list_remove(&rc->rc_list, ref);
92 	list_destroy(&rc->rc_list);
94 	while (ref = list_head(&rc->rc_removed)) {
95 		list_remove(&rc->rc_removed, ref);
99 	list_destroy(&rc->rc_removed);
100 	mutex_destroy(&rc->rc_mtx);
104 refcount_destroy(refcount_t *rc)
106 	refcount_destroy_many(rc, 0);
110 refcount_is_zero(refcount_t *rc)
112 	return (rc->rc_count == 0);
116 refcount_count(refcount_t *rc)
118 	return (rc->rc_count);
122 refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
127 	if (rc->rc_tracked) {
132 	mutex_enter(&rc->rc_mtx);
133 	ASSERT(rc->rc_count >= 0);
134 	if (rc->rc_tracked)
135 		list_insert_head(&rc->rc_list, ref);
136 	rc->rc_count += number;
137 	count = rc->rc_count;
138 	mutex_exit(&rc->rc_mtx);
144 refcount_add(refcount_t *rc, void *holder)
146 	return (refcount_add_many(rc, 1, holder));
150 refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
155 	mutex_enter(&rc->rc_mtx);
156 	ASSERT(rc->rc_count >= number);
158 	if (!rc->rc_tracked) {
159 		rc->rc_count -= number;
160 		count = rc->rc_count;
161 		mutex_exit(&rc->rc_mtx);
165 	for (ref = list_head(&rc->rc_list); ref;
166 	    ref = list_next(&rc->rc_list, ref)) {
168 			list_remove(&rc->rc_list, ref);
173 				list_insert_head(&rc->rc_removed, ref);
174 				rc->rc_removed_count++;
175 				if (rc->rc_removed_count > reference_history) {
176 					ref = list_tail(&rc->rc_removed);
177 					list_remove(&rc->rc_removed, ref);
181 					rc->rc_removed_count--;
186 			rc->rc_count -= number;
187 			count = rc->rc_count;
188 			mutex_exit(&rc->rc_mtx);
193 	    (u_longlong_t)(uintptr_t)rc);
198 refcount_remove(refcount_t *rc, void *holder)
200 	return (refcount_remove_many(rc, 1, holder));