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Mention scapegoat as index alternative

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~erin 2023-04-20 17:29:05 -04:00
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src/development/design/filesystem.md
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@ -120,7 +120,7 @@ will be determined via [capabilities](/development/design/actor.md#ocap)
Created in-memory on startup, modified directly whenever the filesystem is modified.
It's saved in the *Index Sector* (which is at a known offset), allowing it to be read in easily on boot.
The index is simply an `alloc::` [BTreeMap](https://doc.rust-lang.org/stable/alloc/collections/btree_map/struct.BTreeMap.html).
The index is simply an `alloc::` [BTreeMap](https://doc.rust-lang.org/stable/alloc/collections/btree_map/struct.BTreeMap.html). *(If not, try [scapegoat](https://lib.rs/crates/scapegoat))*.
We also have a simple `Vec` of the chunks that are free, which we modify in reverse.