The Second Extended File System (Ext2fs) is very popular among Linux
users. If you use Linux, chances are that you are using the ext2 filesystem.
Ext2fs was designed by Remy Card and Wayne Davison. It was
implemented by Remy Card and was further enhanced by Stephen
Tweedie and Theodore Ts'o.
The ext2 filesystem is still under development. I will document here version 0.5a, which is distributed along with Linux 1.2.x. At this time of writing, the most recent version of Linux is 1.3.13, and the version of the ext2 kernel source is 0.5b. A lot of fancy enhancements are planned for the ext2 filesystem in Linux 1.3, so stay tuned.