diff --git a/dump/main.c b/dump/main.c
index 860ee5a2..44f65dab 100644
--- a/dump/main.c
+++ b/dump/main.c
@@ -359,14 +359,6 @@ static int erofsdump_readdir(struct erofs_dir_context *ctx)
 	return 0;
 }
 
-static int erofsdump_map_blocks(struct erofs_inode *inode,
-		struct erofs_map_blocks *map, int flags)
-{
-	if (erofs_inode_is_data_compressed(inode->datalayout))
-		return z_erofs_map_blocks_iter(inode, map, flags);
-	return erofs_map_blocks(inode, map, flags);
-}
-
 static void erofsdump_show_fileinfo(bool show_extent)
 {
 	const char *ext_fmt[] = {
@@ -461,8 +453,7 @@ static void erofsdump_show_fileinfo(bool show_extent)
 	while (map.m_la < inode.i_size) {
 		struct erofs_map_dev mdev;
 
-		err = erofsdump_map_blocks(&inode, &map,
-				EROFS_GET_BLOCKS_FIEMAP);
+		err = erofs_map_blocks(&inode, &map, EROFS_GET_BLOCKS_FIEMAP);
 		if (err) {
 			erofs_err("failed to get file blocks range");
 			return;
diff --git a/fsck/main.c b/fsck/main.c
index f20b767c..f56a8122 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -527,31 +527,12 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd)
 	erofs_dbg("verify data chunk of nid(%llu): type(%d)",
 		  inode->nid | 0ULL, inode->datalayout);
 
-	switch (inode->datalayout) {
-	case EROFS_INODE_FLAT_PLAIN:
-	case EROFS_INODE_FLAT_INLINE:
-	case EROFS_INODE_CHUNK_BASED:
-		compressed = false;
-		break;
-	case EROFS_INODE_COMPRESSED_FULL:
-	case EROFS_INODE_COMPRESSED_COMPACT:
-		compressed = true;
-		break;
-	default:
-		erofs_err("unknown datalayout");
-		return -EINVAL;
-	}
-
+	compressed = erofs_inode_is_data_compressed(inode->datalayout);
 	while (pos < inode->i_size) {
 		unsigned int alloc_rawsize;
 
 		map.m_la = pos;
-		if (compressed)
-			ret = z_erofs_map_blocks_iter(inode, &map,
-					EROFS_GET_BLOCKS_FIEMAP);
-		else
-			ret = erofs_map_blocks(inode, &map,
-					EROFS_GET_BLOCKS_FIEMAP);
+		ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
 		if (ret)
 			goto out;
 
diff --git a/lib/data.c b/lib/data.c
index f37f8f09..80332081 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -62,8 +62,8 @@ static int erofs_map_blocks_flatmode(struct erofs_inode *inode,
 	return err;
 }
 
-int erofs_map_blocks(struct erofs_inode *inode,
-		struct erofs_map_blocks *map, int flags)
+int __erofs_map_blocks(struct erofs_inode *inode,
+		       struct erofs_map_blocks *map, int flags)
 {
 	struct erofs_inode *vi = inode;
 	struct erofs_sb_info *sbi = inode->sbi;
@@ -132,6 +132,14 @@ int erofs_map_blocks(struct erofs_inode *inode,
 	return err;
 }
 
+int erofs_map_blocks(struct erofs_inode *inode,
+		     struct erofs_map_blocks *map, int flags)
+{
+	if (erofs_inode_is_data_compressed(inode->datalayout))
+		return z_erofs_map_blocks_iter(inode, map, flags);
+	return __erofs_map_blocks(inode, map, flags);
+}
+
 int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map)
 {
 	struct erofs_device_info *dif;