Marcelo Tosatti released 2.4.20-pre4 today. Included in the bug fixes and driver updates was the merge of JFS. JFS is IBM’s journaled filesystem port from OS/2. JFS had previously been merged into the -ac tree (2.4.18pre9-ac4) and was merged into the 2.5 tree early on (2.5.6). JFS joins ext3 and reiserfs in the 2.4 tree. SGI’s XFS is still awaiting inclusion into the stable tree. Read more at KernelTrap.