Unable to mount hammer file system Undo failed

[elekktretterr at exemail.com.au]

> I am NOT talking about background fsck which is implemented in FreeBSD and
> i turn this off.
>
> I am talking about just not doing fsck of every filesystem after crash.
> And doing it within same day but when pause is not a problem.
>
> This is legitimate method with UFS+softupdates.
>

Then explain this: Every now and then when the OS crashed it would leave
truncated files that wouldn't be recovered until fsck ran.

Background fsck is another abomination. I remember once I had a truncated
file that got written to before fsck repaired it and it caused data loss
on that file.