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Zhe ChenandChris Lu
547befc070
* s3api: preserve remote object ETags across cache fills * s3api: align remote copy validators and reject stale ETags * s3api: keep remote ETag through metadata touches, drop it after resizes The remote-ETag check required Mtime to match RemoteMtime, so a utimens on a cold remote object returned an empty ETag until a later cache fill restored the remote value. It also trusted LastLocalSyncTsNs alone, so a setattr resize that leaves chunks and the stamp untouched kept serving the old remote ETag for different local bytes. Require FileSize to match RemoteSize for both the synced and remote-only paths and stop comparing modification times: content changes already surface through cleared sync stamps, chunks, or inline content, while a metadata-only touch leaves the remote bytes authoritative. Regression tests cover touched cold and cached entries and resized cached entries. --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>