Anatomy of ext4
IBM developerWorks has a good article on the anatomy of the ext4 filesystem. The ext filesystem was recently included in the stable 2.6.28 Linux kernel release, so now is a good time to learn more about one of the Linux filesystems of the future. (The Fedora project announced that ext4 would be the default filesystem in their Fedora 11 final release).
Further reading for ext4:
February 23rd, 2009 at 7:29 pm
Already part of the latest ArchLinux release.
http://www.archlinux.org/news/434/