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-rw-r--r--Documentation/filesystems/porting.rst9
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diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index d69f59700a23..878e72b2f8b7 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -1052,3 +1052,12 @@ kill_anon_super(), or kill_block_super() helpers.
Lock ordering has been changed so that s_umount ranks above open_mutex again.
All places where s_umount was taken under open_mutex have been fixed up.
+
+---
+
+**mandatory**
+
+export_operations ->encode_fh() no longer has a default implementation to
+encode FILEID_INO32_GEN* file handles.
+Filesystems that used the default implementation may use the generic helper
+generic_encode_ino32_fh() explicitly.