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Description
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Fishworks wants a "snapused" property, so that they can decompose the "used" space for a fs into:
used = unused refrsrv + snapused + headused +
used by children + children's unused rsrv
(headused can be computed from the other values, but it may be simpler to store it explicitly as well)
snapused is defined as the space that would be freed if all snapshots of that filesystem/volume were destroyed. (Note, it does not include space in clones that would also have to be destroyed for the snapshots to be destroyed.)
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