+ spin_lock(&head->lock);
+ while ((node = rb_first(&head->ref_root)) != NULL) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node,
+ rb_node);
+ ref->in_tree = 0;
+ rb_erase(&ref->rb_node, &head->ref_root);
+ atomic_dec(&delayed_refs->num_entries);
+ btrfs_put_delayed_ref(ref);
+ cond_resched_lock(&head->lock);
+ }
+ if (head->must_insert_reserved)
+ pin_bytes = true;
+ btrfs_free_delayed_extent_op(head->extent_op);
+ delayed_refs->num_heads--;
+ if (head->processing == 0)
+ delayed_refs->num_heads_ready--;
+ atomic_dec(&delayed_refs->num_entries);
+ head->node.in_tree = 0;
+ rb_erase(&head->href_node, &delayed_refs->href_root);
+ spin_unlock(&head->lock);
+ spin_unlock(&delayed_refs->lock);
+ mutex_unlock(&head->mutex);