erofs: clean up z_erofs_extent_lookback

Avoid the unnecessary tail recursion since it can be converted into
a loop directly in order to prevent potential stack overflow.

It's a pretty straightforward conversion.

Link: https://lore.kernel.org/r/20220310182743.102365-1-hsiangkao@linux.alibaba.comReviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/zmap.c

@@ -431,20 +431,13 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
 				   unsigned int lookback_distance)
 {
 	struct erofs_inode *const vi = EROFS_I(m->inode);
-	struct erofs_map_blocks *const map = m->map;
 	const unsigned int lclusterbits = vi->z_logical_clusterbits;
-	unsigned long lcn = m->lcn;
-	int err;
 
-	if (lcn < lookback_distance) {
-		erofs_err(m->inode->i_sb,
-			  "bogus lookback distance @ nid %llu", vi->nid);
-		DBG_BUGON(1);
-		return -EFSCORRUPTED;
-	}
+	while (m->lcn >= lookback_distance) {
+		unsigned long lcn = m->lcn - lookback_distance;
+		int err;
 
 		/* load extent head logical cluster if needed */
-	lcn -= lookback_distance;
 		err = z_erofs_load_cluster_from_disk(m, lcn, false);
 		if (err)
 			return err;
@@ -458,13 +451,14 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
 				DBG_BUGON(1);
 				return -EFSCORRUPTED;
 			}
-		return z_erofs_extent_lookback(m, m->delta[0]);
+			lookback_distance = m->delta[0];
+			continue;
 		case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
 		case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
 		case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
 			m->headtype = m->type;
-		map->m_la = (lcn << lclusterbits) | m->clusterofs;
-		break;
+			m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
+			return 0;
 		default:
 			erofs_err(m->inode->i_sb,
 				  "unknown type %u @ lcn %lu of nid %llu",
@@ -472,7 +466,12 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
 			DBG_BUGON(1);
 			return -EOPNOTSUPP;
 		}
-	return 0;
+	}
+
+	erofs_err(m->inode->i_sb, "bogus lookback distance @ nid %llu",
+		  vi->nid);
+	DBG_BUGON(1);
+	return -EFSCORRUPTED;
 }
 
 static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,