link_to_fixup_dir
ret = link_to_fixup_dir(wc, location.objectid);
static int link_to_fixup_dir(struct walk_control *wc, u64 objectid);
ret = link_to_fixup_dir(wc, di_key.objectid);
ret = link_to_fixup_dir(wc, location.objectid);
ret = link_to_fixup_dir(wc, wc->log_key.objectid);