ext2文件系统：http://learn.akae.cn/media/ch29s02.html
linux磁盘block size: http://sheriy.com/2010/11/02/linux-disk-block-size/
linux磁盘与文件系统原理： http://www.cnblogs.com/brokencode/archive/2012/03/02/2377794.html
linux文件系统：http://www.trekshot.org/static/z/101223-linux-filesystem.html
其他：
http://blog.csdn.net/zhangxinrun/article/details/5870603
http://linux.chinaunix.net/techdoc/beginner/2009/07/15/1124345.shtml
http://blog.sina.com.cn/s/blog_5ce87d560100ce74.html
http://qingwang.blog.51cto.com/505009/491367
http://blog.csdn.net/iamonlyme/article/details/7075751