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-rw-r--r--Documentation/filesystems/overlayfs.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst
index 7da6c30ed596..316cfd8b1891 100644
--- a/Documentation/filesystems/overlayfs.rst
+++ b/Documentation/filesystems/overlayfs.rst
@@ -466,6 +466,10 @@ overlay filesystem and the value of st_ino for filesystem objects may not be
persistent and could change even while the overlay filesystem is mounted, as
summarized in the `Inode properties`_ table above.
+4) "idmapped mounts"
+When the upper or lower layers are idmapped mounts overlayfs will be mounted
+without support for POSIX Access Control Lists (ACLs). This limitation will
+eventually be lifted.
Changes to underlying filesystems
---------------------------------