Fsck 2.2 vs 3.0

[Matt Thomas]

> Why doesn't fsck think my disks were "unmounted cleanly" when I 
> switch between Ultrix 2.2 and 3.0?  I'm shutting down with 
> "/etc/shutdown -h now".  This doesn't occur if I reboot the system
> that was running.

In each release of Ultrix, the kernel and fsck share a magic number
that indicated whether a file system has been unmounted cleanly.  This
magic number is different for each release of Ultrix.  Actually this
number changes fairly often (like each baselevel) during the development
of a release.

The reason for the changing of the number is that each baselevel makes
certain assumptions about the consistency of filesystem.  The only way
to insure consistency to make sure fsck and the kernel are built at the
time and they are at the same revision level.

-- 
Matt Thomas                     Internet:   thomas at decwrl.dec.com
DECnet-Ultrix Development       UUCP:       ...!decwrl!thomas
Digital Equipment Corporation   Disclaimer: This message reflects my own
Littleton, MA                               warped views, etc.