#include <sys/zfs_context.h>
#include <sys/refcount.h>
-#if defined(DEBUG) || !defined(_KERNEL)
+#ifdef ZFS_DEBUG
#ifdef _KERNEL
int reference_tracking_enable = FALSE; /* runs out of memory too easily */
reference_t *ref;
ASSERT(rc->rc_count == number);
- while (ref = list_head(&rc->rc_list)) {
+ while ((ref = list_head(&rc->rc_list))) {
list_remove(&rc->rc_list, ref);
kmem_cache_free(reference_cache, ref);
}
list_destroy(&rc->rc_list);
- while (ref = list_head(&rc->rc_removed)) {
+ while ((ref = list_head(&rc->rc_removed))) {
list_remove(&rc->rc_removed, ref);
kmem_cache_free(reference_history_cache, ref->ref_removed);
kmem_cache_free(reference_cache, ref);
int64_t
refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
{
- reference_t *ref;
+ reference_t *ref = NULL;
int64_t count;
if (reference_tracking_enable) {
return (refcount_remove_many(rc, 1, holder));
}
-#endif
+void
+refcount_transfer(refcount_t *dst, refcount_t *src)
+{
+ int64_t count, removed_count;
+ list_t list, removed;
+
+ list_create(&list, sizeof (reference_t),
+ offsetof(reference_t, ref_link));
+ list_create(&removed, sizeof (reference_t),
+ offsetof(reference_t, ref_link));
+
+ mutex_enter(&src->rc_mtx);
+ count = src->rc_count;
+ removed_count = src->rc_removed_count;
+ src->rc_count = 0;
+ src->rc_removed_count = 0;
+ list_move_tail(&list, &src->rc_list);
+ list_move_tail(&removed, &src->rc_removed);
+ mutex_exit(&src->rc_mtx);
+
+ mutex_enter(&dst->rc_mtx);
+ dst->rc_count += count;
+ dst->rc_removed_count += removed_count;
+ list_move_tail(&dst->rc_list, &list);
+ list_move_tail(&dst->rc_removed, &removed);
+ mutex_exit(&dst->rc_mtx);
+
+ list_destroy(&list);
+ list_destroy(&removed);
+}
+
+#endif /* ZFS_DEBUG */