+/**
+ * rootid_from_xattr - translate root uid of vfs caps
+ *
+ * @value: vfs caps value which may be modified by this function
+ * @size: size of @ivalue
+ * @task_ns: user namespace of the caller
+ * @mnt_userns: user namespace of the mount the inode was found from
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ */