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-rw-r--r--include/linux/fs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0f8cc7f2665a..d6e3347cbf69 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -228,6 +228,10 @@ struct iattr {
* are a dedicated type requiring the filesystem to use the dedicated
* helpers. Other filesystem can continue to use ia_{g,u}id until they
* have been ported.
+ *
+ * They always contain the same value. In other words FS_ALLOW_IDMAP
+ * pass down the same value on idmapped mounts as they would on regular
+ * mounts.
*/
union {
kuid_t ia_uid;