fs/reiserfs/fix_node.c
create_virtual_node()



    /* go through all items those remain in the virtual node (except for the new (inserted) one) */
    for (new_num = 0; new_num < vn->vn_nr_item; new_num ++) {
        int j;
        struct virtual_item * vi = vn->vn_vi + new_num;
        int is_affected = ((new_num != vn->vn_affected_item_num) ? 0 : 1);


        if (is_affected && vn->vn_mode == M_INSERT)
            continue;

        /* get item number in source node */
        j = old_item_num (new_num, vn->vn_affected_item_num, vn->vn_mode);

        vi->vi_item_len += ih[j].ih_item_len + IH_SIZE;
        vi->vi_ih = ih + j;
        vi->vi_item = B_I_PITEM (Sh, ih + j);
        vi->vi_uarea = vn->vn_free_ptr;

        // FIXME: there is no check, that item operation did not
        // consume too much memory
        vn->vn_free_ptr += op_create_vi (vn, vi, is_affected, tb->insert_size [0]);
        if (tb->vn_buf + tb->vn_buf_size < vn->vn_free_ptr)
            reiserfs_panic (tb->tb_sb, "vs-8030: create_virtual_node: "
                            "virtual node space consumed");