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-rw-r--r--Documentation/filesystems/porting.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index 85f590254f07..ab48ab3f6eb2 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -1285,3 +1285,15 @@ rather than a VMA, as the VMA at this stage is not yet valid.
The vm_area_desc provides the minimum required information for a filesystem
to initialise state upon memory mapping of a file-backed region, and output
parameters for the file system to set this state.
+
+---
+
+**mandatory**
+
+Calling conventions for vfs_parse_fs_string() have changed; it does *not*
+take length anymore (value ? strlen(value) : 0 is used). If you want
+a different length, use
+
+ vfs_parse_fs_qstr(fc, key, &QSTR_LEN(value, len))
+
+instead.