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FIX: ext4_extent_full.c: should not assign checksum to extent root(in inode)

--- a/lwext4/ext4_extent_full.c

+++ b/lwext4/ext4_extent_full.c

@@ -1151,6 +1151,7 @@

 		    to_le16(ext4_ext_space_block(inode_ref));

 	neh->magic = to_le16(EXT4_EXTENT_MAGIC);

+	ext4_extent_block_csum_set(inode_ref, neh);

 	/* Update top-level index: num,max,pointer */

 	neh = ext_inode_hdr(inode_ref->inode);

@@ -1165,7 +1166,6 @@

 	}

 	neh->depth = to_le16(to_le16(neh->depth) + 1);

-	ext4_extent_block_csum_set(inode_ref, neh);

 	bh.dirty = true;

 	inode_ref->dirty = true;

 	ext4_block_set(inode_ref->fs->bdev, &bh);