__btrfs_next_delayed_item
item = __btrfs_next_delayed_item(item);
item = __btrfs_next_delayed_item(item);
curr_item = __btrfs_next_delayed_item(prev_item);
curr_item = __btrfs_next_delayed_item(prev_item);
item = __btrfs_next_delayed_item(item);
item = __btrfs_next_delayed_item(item);
next = __btrfs_next_delayed_item(curr);
next = __btrfs_next_delayed_item(curr);