fs/zfs/refcount.c

61 refcount_create(refcount_t *rc)
63 	mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
64 	list_create(&rc->rc_list, sizeof (reference_t),
66 	list_create(&rc->rc_removed, sizeof (reference_t),
68 	rc->rc_count = 0;
69 	rc->rc_removed_count = 0;
73 refcount_destroy_many(refcount_t *rc, uint64_t number)
77 	ASSERT(rc->rc_count == number);
78 	while (ref = list_head(&rc->rc_list)) {
79 		list_remove(&rc->rc_list, ref);
82 	list_destroy(&rc->rc_list);
84 	while (ref = list_head(&rc->rc_removed)) {
85 		list_remove(&rc->rc_removed, ref);
89 	list_destroy(&rc->rc_removed);
90 	mutex_destroy(&rc->rc_mtx);
94 refcount_destroy(refcount_t *rc)
96 	refcount_destroy_many(rc, 0);
100 refcount_is_zero(refcount_t *rc)
102 	ASSERT(rc->rc_count >= 0);
103 	return (rc->rc_count == 0);
107 refcount_count(refcount_t *rc)
109 	ASSERT(rc->rc_count >= 0);
110 	return (rc->rc_count);
114 refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
124 	mutex_enter(&rc->rc_mtx);
125 	ASSERT(rc->rc_count >= 0);
127 		list_insert_head(&rc->rc_list, ref);
128 	rc->rc_count += number;
129 	count = rc->rc_count;
130 	mutex_exit(&rc->rc_mtx);
136 refcount_add(refcount_t *rc, void *holder)
138 	return (refcount_add_many(rc, 1, holder));
142 refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
147 	mutex_enter(&rc->rc_mtx);
148 	ASSERT(rc->rc_count >= number);
151 		rc->rc_count -= number;
152 		count = rc->rc_count;
153 		mutex_exit(&rc->rc_mtx);
157 	for (ref = list_head(&rc->rc_list); ref;
158 	    ref = list_next(&rc->rc_list, ref)) {
160 			list_remove(&rc->rc_list, ref);
165 				list_insert_head(&rc->rc_removed, ref);
166 				rc->rc_removed_count++;
167 				if (rc->rc_removed_count >= reference_history) {
168 					ref = list_tail(&rc->rc_removed);
169 					list_remove(&rc->rc_removed, ref);
173 					rc->rc_removed_count--;
178 			rc->rc_count -= number;
179 			count = rc->rc_count;
180 			mutex_exit(&rc->rc_mtx);
185 	    (u_longlong_t)(uintptr_t)rc);
190 refcount_remove(refcount_t *rc, void *holder)
192 	return (refcount_remove_many(rc, 1, holder));