common/rc: set maximum label length for ext4

Set maximum label length for ext4 in _label_get_max() to be able to test
online file system label set/get ioctls.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/common/rc b/common/rc
index bc4a4559a8..a3b941251d 100644
--- a/common/rc
+++ b/common/rc
@@ -4610,6 +4610,9 @@ _label_get_max()
 	f2fs)
 		echo 255
 		;;
+	ext2|ext3|ext4)
+		echo 16
+		;;
 	*)
 		_notrun "$FSTYP does not define maximum label length"
 		;;