code: mafs

ref: 771085748005f256a9572d3b5638749c169e37d2
dir: /decisions/

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make /adm/frees dynamic?
	what value does it add?
		debug extents?
			there are test cases to debug extents already.
			that code should be bug free(?)
			and, even then, /adm/frees would be too slow to debug extents.
			disk/reconcile is good enough for debugging extents.
	/adm/ctl can show the free blocks and used blocks anyway.