update_segment_mtime
update_segment_mtime(sbi, addr_start, 0);
update_segment_mtime(sbi, old_blkaddr, 0);
update_segment_mtime(sbi, *new_blkaddr, old_mtime);
update_segment_mtime(sbi, new_blkaddr, 0);
update_segment_mtime(sbi, old_blkaddr, 0);