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by throw0101d 869 days ago
A journal(-like) mechanism was added to soft-upates by McKusick in the 2010 timeframe:

* https://www.youtube.com/watch?v=_NuhRkiInvA (BSDCan)

* https://www.mckusick.com/softdep/suj.pdf

Which also allows snapshots:

* https://freebsdfoundation.org/project/snapshots-on-filesyste...

See also "Journaling versus Soft Updates: Asynchronous Meta-data Protection in File Systems":

* https://www.seltzer.com/assets/publications/Journaling-versu...