btrfs_select_delayed_ref
struct btrfs_delayed_ref_node *btrfs_select_delayed_ref(struct btrfs_delayed_ref_head *head);
while ((ref = btrfs_select_delayed_ref(locked_ref))) {
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);
node = btrfs_select_delayed_ref(head);