This task is listed as a Google Summer of Code project idea.
IRC, freenode, #hurd, 2011-06-01:
<gnu_srs> Another thing: the lsattr and chattr programs seems to be bogus on Hurd. Are they present since they are part of e2fsprogs? <youpi> I don't think the Hurd has an interface for it <tschwinge> gnu_srs, youpi: lsattr/chattr are extended attributes, right? We do have some patches from years ago for adding some support in glibc, but they're not yet integrated. And also we do have a plan for using these instead of our Hurd-specific passive translator information in inodes.
If interested in working on this, talk to tschwinge, and see these resources:
http://lists.gnu.org/archive/html/bug-hurd/2006-02/threads.html#00115, http://lists.gnu.org/archive/html/bug-hurd/2006-01/threads.html#00180, http://lists.gnu.org/archive/html/bug-hurd/2006-05/threads.html#00042
IRC, OFTC, #debian-hurd, 2012-03-18:
<pinotree> notes to self: it seems our ext2 driver comes from linux 2.3.42 or so, and in linux 2.5.46 ext2/ext3 get xattr and acl support