--- zzzz-none-000/linux-4.4.60/fs/ext4/ext4_extents.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/fs/ext4/ext4_extents.h	2021-02-04 17:41:59.000000000 +0000
@@ -103,6 +103,7 @@
 };
 
 #define EXT4_EXT_MAGIC		cpu_to_le16(0xf30a)
+#define EXT4_MAX_EXTENT_DEPTH 5
 
 #define EXT4_EXTENT_TAIL_OFFSET(hdr) \
 	(sizeof(struct ext4_extent_header) + \