If you have a problem with your filesystem and the server won't come up to multi-user mode then you need to log in to single user mode and fix the file system (linux will prompt you for the root password and drop you into single user mode).
You should probably try running "e2fsck -p /dev/hda6" (assuming you're not running a raid system -- if you are replace hda6 with md1). This will *most likely* fix any file sytem problems and put any "lost" files in the directory "/lost+found/" with cryptic filenames. Try running "file /lost+found/*" to try and identify any "found" files.
In the worst case senario you can do a reinstall of the e-smith software and then restore from your nightly backup. You should verify the integrity of your backup before doing a fresh install on the existing machine, perhaps by performing this procedure on a different machine first.
This advice is provided with no knowledge other than your "file system is corrupt." In the future it would be much more useful if you provided more information. Also, the "subject" of your post should be more descriptive.
Regards.
Chris