udf: implement mode and dmode mounting options

"dmode" allows overriding permissions of directories and
"mode" allows overriding permissions of files.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 1c1c514..5d32c60 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -123,6 +123,8 @@
 	mode_t			s_umask;
 	gid_t			s_gid;
 	uid_t			s_uid;
+	mode_t			s_fmode;
+	mode_t			s_dmode;
 
 	/* Root Info */
 	struct timespec		s_record_time;