改变文件系统的某些特性，可参考如下代码：
$ sudo umount /dev/sdb1
$ sudo debugfs
debugfs: open -w /dev/sdb1
debugfs: features has_journal -extra_isize
debugfs: close
debugfs: quit
$
开发笔记
$ sudo umount /dev/sdb1
$ sudo debugfs
debugfs: open -w /dev/sdb1
debugfs: features has_journal -extra_isize
debugfs: close
debugfs: quit
$