The testing which I have personally done is that I have built and run it
on Ubuntu Gutsy; it passes the regression test suite and I have been
using it on my production laptop without any problems.   It definitely
does upgrade correctly from the previous Ubuntu Gutsy version, as I
regularly downgrade and upgrade e2fsprogs.   I have not done any testing
on Ubuntu Hardy.

The changes between 1.40.3 and 1.40.7 are upstream microreleases that
are primarily bug fixes; there are some new filesystem types which blkid
has been taught how to use, including being able to properly detect
ext4/ext4dev filesystems which were needed to future-proof e2fsprogs.
This is largely moot given that mount doesn't use the blkid library
(which means mount will almost certainly fail to correctly detect and
deal with ext4 filesystem on Ubuntu Hardy, but this is true regardless
of whether you uplift e2fsprogs or not).    The other big change of note
was to fix Red Hat Bug #233471 / Sourceforge Bug #1529672 which required
substantial changes to the uuid library, including an optional uuidd
daemon which has been packaged in a new package, uuid-runtime.   So it's
a bug fix, but it's a biggy.  This received extensive testing by Red
Hat, Novell, and the Major Enterprise Resource Planning ISV that
requested this bugfix.

Oh, one other change of note is that mke2fs will now create new
filesystems with 256 byte inodes.  This is brings a **significant**
speedup on systems using SELinux and Samba, and provides better ext4
future-proofing (since many of ext4's new features require the larger
256-byte inode).  This change is pretty easy to revert simply by
changing the mke2fs.conf file, and this may have an impact on the
installer.

As you look at the diffstats and the Release Notes, the changes are
definitely quite substantial.   But there have been a huge number of bug
fixed, so therein lies the tradeoff.   I can definitely see how the
Ubuntu Release Team might in the end decide this is too risky, despite
all of the bugs that had been fixed, as it is pretty late in the game.
Your call....  (although if you don't my guess is someone is going to
have to pull down a subset of patches since I suspect Launchpad #187265
in particular will get multiple complaints once Hardy gets a broader
test audience)

-- 
Please sync e2fsprogs e2fsprogs 1.40.7-1 with Debian
https://bugs.launchpad.net/bugs/197167
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