DragonFly's HAMMER2 File-System Receiving Christmas Improvements

This latest round of HAMMER2 work for DragonFlyBSD includes meta-consistency protection for snapshots and crashes, guarantee of buffer cache consistency, clearing up front-end stalls during a file-system sync, improved snapshot operation, and more. This work is also moving towards HAMMER2 clustering work that is still among their plans for this next-gen BSD file-system.
More details on these December updates to HAMMER2 can be found via the DragonFly mailing list.
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