HEADS UP: SUJ Going in to head today

Jeff Roberson jroberson at jroberson.net
Wed Apr 21 07:29:47 UTC 2010

On Tue, 20 Apr 2010, Patrick Tracanelli wrote:

> Jeff Roberson escreveu:
>> Hi Folks,
>> You may have seen my other Soft-updates journaling (SUJ) announcements.
>> If not, it is a journaling system that works cooperatively with
>> soft-updates to eliminate the full background filesystem check after an
>> unclean shutdown.  SUJ may be enabled with tunefs -j enable and disabled
>> with tunefs -j disable on an unmounted filesystem.  It is backwards
>> compatible with soft-updates with no journal.
>> I'm going to do another round of tests and buildworld this afternoon to
>> verify the diff and then I'm committing to head.  This is a very large
>> feature and fundamentally changes softupdates.  Although it has been
>> extensively tested by many there may be unforseen problems.  If you run
>> into an issue that you think may be suj please email me directly as well
>> as posting on current as I sometimes miss list email and this will
>> ensure the quickest response.
> Hello Jeff, McKusick and others envolved.
> Is an MFC technically possible? If so, are there plans to do so?

I do have an 8 backport branch available although it is a little stale.  I 
intend to keep it somewhat up to date.  I think it will take some time 
before we have sufficient experience with SUJ in head before we want to 
put it back in 8.  It is quite a complex and disruptive feature.


> Thank you.
> -- 
> Patrick Tracanelli

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