Followup #34
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Followup #34
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The rc in the root was causing reformat churn
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aboodman
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Oct 28, 2021
We use ref counting to implement garbage collection. This is done at the `dag::Write` layer. We do the garbage collection in `dag::Write::commit`. - A head keeps a chunk alive. - A ref from one alive chunk to another chunk keeps the other chunk alive. When we call `set_head` we record the new and old hash so that we can increment and decrement the ref counts later in `commit`. When we call `put_chunk` we record the hash so that we can check for orphaned chunks in `commit`. Fixes #34
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