How long has Fedora supported Ext4?
Fedora 9 originally included experimental support for Ext4, if the “ext4dev” anaconda installation-time option was given; in Fedora 10 as well, with the “ext4” option. After extensive feedback, testing, and a number of new Ext4 changes developed in coordination with the lead Red Hat filesystem developer, Eric Sandeen (who hacks on Ext4 as well as XFS), Ext4 is now enabled as the default filesystem in Fedora 11.