UFS2 Journaling implementation detail

Ivan Voras ivoras at freebsd.org
Wed Apr 16 20:30:15 UTC 2008

Unga wrote:
> Hi all
> I'm looking for papers or documentation covering
> details of the UFS2 Journaling implementation of the
> FreeBSD.
> Please give me links to them if you guys know any.
> Many thanks in advance.

There's no such thing as UFS2 Journalling in FreeBSD (yet). There's 
"gjournal" which is journaling on the data layer (below the file system, 
and only with very limited integration with the file system). This 
implementation is not documented (except for usage here: 
but there's a small (and very old) high-level overview in my proposal on 
which the current gjournal is based, here: 
http://wiki.freebsd.org/gjournal_proposal . Ignore the bits about 
"delay-commit". See also here: 

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