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Chris Lu
2737315e9d
* filer_pb,filer: per-mutation preconditions on ObjectTransaction A transaction's request-level condition evaluates one entry before any mutation runs, so a commit guarding two paths — the object it publishes and the upload directory it assembles — could not be expressed. Give each ObjectMutation an optional condition (evaluated against condition_key, else the mutation's target, under the same lock just before the mutation applies) and report which mutation failed through failed_mutation on the response, so callers can tell a mutation guard's rejection apart from the request-level precondition's. * s3: evaluate multipart completion conditions under the object lock CompleteMultipartUpload checked conditional headers gateway-side before committing, and the routed commit transaction guarded only the upload directory — nothing made If-None-Match: * atomic with the publish, so concurrent conditional completions of the same absent key could all report success. The request's reducible write condition (If-None-Match/If-Match, star or single strong ETag) now rides the commit as the transaction's request condition on the owner filer: on the object path for unversioned buckets, falling back to the .versions directory for suspended and enabled versioning. The upload-exists guard moves onto the PUT mutation, keeping its check-before-publish ordering. Conditions the reducer cannot express stay on the distributed write lock, where check and commit already serialize. * filer,s3: resolve the latest version first for versioned conditional writes * filer: keep directory entries holding content out of the absent-slot rule * s3: keep a gateway-side upload-exists check for filers without mutation conditions * filer: honor null-version-is-latest resolving prefer-alt conditions * drop scratch multipart-race repro programs * s3: note the write lock does not cover routed writes on non-reducible conditions