Zach Brown 8604c85486 scoutfs: add basic reing replay on mount
Read the ring described by the super block and replay its entries to
rebuild the in-memory state of the chunk allocator and log segment
manifest.

We add just enough of the chunk allocator to set the free bits to the
contents of the ring bitmap entries.

We start to build out the basic manifest data structure.  It'll
certainly evolve when we later add code to actually query it.

Signed-off-by: Zach Brown <zab@versity.com>
2016-02-26 17:00:19 -08:00
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