[PATCH 0/6] fix INT_MAX readdir hang, plus cleanups

[Zach Brown <zab@redhat.com>]

Hi gang,

I finally sat down to fix that readdir hang that has been in the back
of my mind for a while.  I *hope* that the fix is pretty simple: just
don't manufacture a fake f_pos, I *think* we can abuse f_version as an
indicator that we shouldn't return entries.  Does this look reasonable?

We still have the problem that we can generate valid large f_pos values
that can confuse 32bit userspace, but that's a different problem.  I
think we'll want filldir generation of EOVERFLOW like what exists for
large inodes. 

The rest of the patches are cleanups that I saw when absorbing the
code.  It's all lightly tested with xfstests but it wouldn't surprise
me if I missed something so review is appreciated.

Thanks!

- z