"Marcelo 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 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..."