Module usn 

USN change-journal tailing: pure record parsing (records), per-FRN reduction + index application (apply), and the OS-facing session (session, Windows only).

See docs/ARCHITECTURE.md for the threading model and fallback rules.

Re-exports

pub use apply::BatchStats;

pub use apply::NullStatFetcher;

pub use apply::StatFetcher;

pub use apply::apply_batch;

pub use records::UsnRecord;

pub use records::parse_buffer;

pub use records::reason;

pub use session::JournalGone;

pub use session::ReadOutcome;

pub use session::UsnError;

pub use session::UsnJournal;

pub use session::VolumeStatFetcher;

Modules

apply

Reduce a journal batch to per-FRN final operations and apply them to the index.

records

Pure USN_RECORD_V2 buffer parsing — no OS calls, so the whole layer is testable from raw byte fixtures (docs/ARCHITECTURE.md, CLAUDE.md elevation rules).

session

Live USN-journal session: volume handle, FSCTL wrappers, blocking reads and the per-file stat fetcher.