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### What? Changes the `root` parameter of `DiskFileSystem::new`, `DiskFileSystem::new_with_denied_paths`, and the internal `DiskFileSystem::new_internal` from `RcStr` to `Vc<RcStr>`. ### Why? Part of the effort to make the Turbopack persistent cache portable when the absolute path of the project directory changes. By accepting the root as a `Vc<RcStr>` instead of a plain `RcStr`, the path is tracked as a turbo-tasks value. This allows the cache to remain valid even when the project root moves (e.g. on a different machine, a different CI working directory, or a relocated checkout), since the value can be substituted independently without invalidating unrelated cached computations. ### How? - `new_internal` is now an `async fn` that awaits the `Vc<RcStr>` to extract the underlying `RcStr` for constructing `DiskFileSystemInner`. It returns `Result<Vc<Self>>` accordingly. - `new` and `new_with_denied_paths` (the public constructors, which are not `#[turbo_tasks::function]` themselves) are updated to accept `Vc<RcStr>` and forward it to `new_internal`. - All 23 call sites across the codebase are updated to wrap their root string with `Vc::cell(...)` before passing it. Verified with `cargo clippy --all-targets` (clean), `cargo test -p turbo-tasks-backend` (all pass), and `cargo test -p turbopack-tests` (all 89 pass). <!-- NEXT_JS_LLM_PR --> --------- Co-authored-by: Tobias Koppers <[email protected]> Co-authored-by: Claude <[email protected]>