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The libblkid in the hal extension does indeed recognize ext4, and it would be good if hal could be made modular by seperating libblkid into it's own extension for those who only need libblkid and not hal. This is one case, and libblkid along with filesystems-2.6.29.1 being made into core extensions and dropped into a remaster would support ext4. The same could be said of libuuid since supporting libraries from seperate sources really belong in their own extension.
Thanks!I will test placing the filesystem extension along with libblkid in a remaster and see if ext4 would work. If reiserfs worked, and it is not one of the fs types looked for upon boot, then ext4 may just work.