[Bug 261944] FFS/UFS: explain soft update journaling (SUJ) in documentation and in tunefs(8)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261944

--- Comment #5 from Graham Perrin <grahamperrin@gmail.com> ---
Re: bug 263433 comment 1

Previously undiscovered by me (not mentioned in relevant pages): 

    ffs(7)

> …  Soft updates can also add journaling that reduces the time spent by 
> fsck_ffs(8) cleaning up a filesystem after a crash from several minutes 
> to a few seconds.  The journal is placed in an inode named .sujournal, 
> and is kept as a circular log of segments containing records that 
> describe metadata operations. …

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