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-rw-r--r--Documentation/filesystems/nfs/exporting.rst7
-rw-r--r--Documentation/filesystems/porting.rst9
2 files changed, 11 insertions, 5 deletions
diff --git a/Documentation/filesystems/nfs/exporting.rst b/Documentation/filesystems/nfs/exporting.rst
index 198d805d611c..f04ce1215a03 100644
--- a/Documentation/filesystems/nfs/exporting.rst
+++ b/Documentation/filesystems/nfs/exporting.rst
@@ -122,12 +122,9 @@ are exportable by setting the s_export_op field in the struct
super_block. This field must point to a "struct export_operations"
struct which has the following members:
- encode_fh (optional)
+ encode_fh (mandatory)
Takes a dentry and creates a filehandle fragment which may later be used
- to find or create a dentry for the same object. The default
- implementation creates a filehandle fragment that encodes a 32bit inode
- and generation number for the inode encoded, and if necessary the
- same information for the parent.
+ to find or create a dentry for the same object.
fh_to_dentry (mandatory)
Given a filehandle fragment, this should find the implied object and
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.