* s3: stop warming every bucket's config at startup
Listing all buckets in BucketRegistry.init() made S3 gateway startup
O(buckets) and pinned every bucket's metadata and config resident, which
does not scale past a few hundred thousand buckets. Both caches already
have lazy miss paths, so load on first access instead and let the
metadata subscription refresh only entries already resident; cold
buckets cost one filer round-trip on their first request.
* s3: bound the per-bucket caches with LRU eviction
The bucket config cache, bucket registry, and their negative caches were
plain maps that only ever grew: the config cache TTL made Get miss but
never evicted the entry, and the not-found sets grew on every probe of a
nonexistent bucket name. Cap all four at 65536 entries with LRU eviction
so a gateway keeps its hot working set and evicted buckets reload from
the filer on next access.
* s3: cache parsed bucket config instead of the full filer entry
Each cached BucketConfig retained the whole bucket entry (extended
attribute map plus raw content bytes) alongside the fields parsed from
it, roughly doubling per-bucket cache cost and keeping data the read
path never looks at. Parse everything up front in
newBucketConfigFromEntry - now also the creator identity, tags,
encryption config, and stored lifecycle XML - and drop the entry.
updateBucketConfig now reads the entry fresh from the filer and diffs
the mapped extended attributes against it, so the patch is computed
against current state instead of a cached copy; the config clone
helpers that existed for that path go away.
* s3: dedup cold bucket-registry loads per bucket
The registry's notFound lock doubled as the load serializer, holding one
global mutex across the filer round-trip so first-touch requests for
different buckets queued behind each other; the cache fill also happened
after the lock was released, so two concurrent misses for the same
bucket could both reach the filer. Replace it with a singleflight per
bucket that fills the cache inside the flight: different buckets load
concurrently, the same bucket loads once.
* s3: implement Bucket Owner Enforced for object ownership
Objects uploaded by service accounts (or any user) are now owned by
the bucket owner when the bucket has BucketOwnerEnforced ownership
policy (the modern AWS default since April 2023).
This provides a more intuitive ownership model where users expect
objects created by their service accounts to be owned by themselves.
- Modified setObjectOwnerFromRequest to check bucket ObjectOwnership
- When BucketOwnerEnforced: use bucket owner's account ID
- When ObjectWriter: use uploader's account ID (backward compatible)
* s3: add nil check and fix ownership logic hole
- Add nil check for bucketRegistry before calling GetBucketMetadata
- Fix logic hole where objects could be created without owner when
BucketOwnerEnforced is set but bucket owner is nil
- Refactor to ensure objects always have an owner by falling back
to uploader when bucket owner is unavailable
- Improve logging to distinguish between different fallback scenarios
Addresses code review feedback from Gemini on PR #7913
* s3: add comprehensive tests for object ownership logic
Add unit tests for setObjectOwnerFromRequest covering:
- BucketOwnerEnforced: uses bucket owner
- ObjectWriter: uses uploader
- BucketOwnerPreferred: uses uploader
- Nil owner fallback scenarios
- Bucket metadata errors
- Nil bucketRegistry
- Empty account ID handling
All 8 test cases pass, verifying correct ownership assignment
in all scenarios including edge cases.
Chris Lu