ext_debug(tree, "remove [%lu:%lu] in leaf\n", start, end);
if (!path[depth].p_hdr)
path[depth].p_hdr = EXT_BLOCK_HDR(path[depth].p_bh);
ext_debug(tree, "remove [%lu:%lu] in leaf\n", start, end);
if (!path[depth].p_hdr)
path[depth].p_hdr = EXT_BLOCK_HDR(path[depth].p_bh);