i_lfs_segdhd
RB_TREE_FOREACH_SAFE(isd, &ip->i_lfs_segdhd, tmp) {
rb_tree_remove_node(&ip->i_lfs_segdhd, isd);
sd = rb_tree_find_node(&ip->i_lfs_segdhd, &lastseg);
rb_tree_insert_node(&ip->i_lfs_segdhd, sd);
lfs_finalize_seguse(fs, &ip->i_lfs_segdhd);
rb_tree_init(&ip->i_lfs_segdhd, &lfs_rbtree_ops);