EXT4_MOUNT_BLOCK_VALIDITY 1687 fs/ext4/super.c {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, EXT4_MOUNT_BLOCK_VALIDITY 1688 fs/ext4/super.c {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},