feat(scanner): retain bounded bootstrap admission fairness
Keep a leader-local bounded cohort across scanner retries and preserve
waiting bucket priority during dirty arrivals and capacity overflow.
Order source permits in the dispatcher without changing result identity,
parent budgets, explicit cycle timing, or persistent coverage evidence.
Co-authored-by: heihutu <heihutu@gmail.com>
Co-authored-by: zhi22915 <qiuzgang@gmail.com>
Also replace deprecated Atomic::fetch_update calls with try_update so the
current Rust toolchain keeps lint and CI jobs warning-clean.
Co-authored-by: heihutu <heihutu@gmail.com>
Split the 5369-line scanner_io.rs (39% inline tests) into a canonical
scanner_io.rs + scanner_io/ module tree with zero behavior change:
- scanner_io.rs (~660): constants, metadata-error constructors, the
bucket scan plan, cycle-status classification helpers, the ScannerIO /
ScannerIOCache / ScannerIODisk traits, and ScannerCycleResult
- scanner_io/dirty_usage.rs (~300): process-wide dirty-usage statics
and the acknowledgment protocol
- scanner_io/guards.rs (~270): concurrency gauges and RAII guards
- scanner_io/cache.rs (~410): scanner cache locks and the snapshot
persist/publish path
- scanner_io/io_cycle.rs (~390), io_cache.rs (~1160), io_disk.rs
(~230): the ECStore / SetDisks / Disk trait implementations
- scanner_io/publish_gate_tests.rs (~750) and tests.rs (~1340): the two
inline test modules as child modules
All crate paths are unchanged: the lib.rs scanner_io re-exports and
every crate::scanner_io:: consumer (scanner.rs, remote_scanner,
scanner_folder, and cross-crate rustfs users) resolve through root
re-exports with their original visibilities (pub stays pub, pub(crate)
stays pub(crate)). Cross-module items gain pub(super), whose scope
equals the old single-module privacy domain. Code is moved verbatim
apart from those markers, per-module import headers, and rustfmt
re-wraps.
The logging-guardrail nsscanner_disk skip-set_disks rule now points at
scanner_io/io_disk.rs where the function moved; the pattern and
thresholds are unchanged.
Co-authored-by: heihutu <heihutu@gmail.com>
houseme