+ test_yaffs_unmount2_ENOENT //cannot be generated in yaffs.
+ test_yaffs_unmount2_ENOTDIR //cannot be generated in yaffs.
+ test_yaffs_unmount2_ENAMETOOLONG
+
+
+ test_yaffs_remount_force_off_read_only_on
+ test_yaffs_remount_force_on_read_only_on
+ test_yaffs_remount_ENOENT //cannot be generated in yaffs
+ test_yaffs_remount_ENOTDIR //cannot be generated in yaffs
+
+