Плохо смотришь, причем xfs и jfs должны быть в онлайне, чтобы их отресайзить:
http://www.linux.org/docs/ldp/howto/LVM-HOWTO/extendlv.html How to online resize the Ext4 filesystem?
Online resizing of ext4 works in a similar manner as ext3, using either resize2fs or ext2resize, but there is currently a limit (around 4TB or so) to the maximum filesystem size. Implementing online resize with the META_BG feature would allow this limit to be exceeded.
reiserfs
Reiserfs file systems can be resized when mounted or unmounted as you prefer
XFS file systems must be mounted to be resized and the mount-point is specified rather than the device name.
Just like XFS the JFS file system must be mounted to be resized and the mount-point is specified rather than the device name.