In my own testing, root on ext3 and reiserfs works now, and xfs, jfs, ext2 are all usable (not tested as root filesystems). The new tunable parameters for ext2/3 work, but I did find some odd problems resulting from using other than the defaults (things like 4 mb inodes making it very easy to run out of inodes). The mount parameter dialogs seem to work, but I have not tested them thuroughly.
Root on lvm also works ok no tweaking needed now BTW. -- see shy jo
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