/tmp is unwriteable

[Derek Broughton]

I am having odd behaviour in recent days.  After I reboot, /tmp has
permissions 'drwxr-xr-x'.  I'm pretty sure it's supposed to be
'drwxrwxrwt' (1777), and after setting that everything seems to work.

I also found that the files in /tmp survived reboot, but this would seem to
be because /etc/init.d/bootclean.sh intentionally doesn't clean out /tmp if
it isn't world writeable.

/tmp is on an LVM.  mount shows:
 /dev/mapper/Linux-temp on /tmp type reiserfs (rw)

Where is /tmp initialized?  
-- 
derek