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* filer: let PATCH_EXTENDED replace Entry.content PATCH_EXTENDED merges extended attributes under the per-path lock, reading the entry fresh, so concurrent patches to different keys don't clobber each other. Some single-key state lives in Entry.content rather than an extended attribute (e.g. the S3 bucket metadata blob). Add set_content/content to the mutation so a patch can replace content the same way -- read fresh, set content, preserve the rest -- letting a content write and an extended-attribute write on the same entry serialize on the lock instead of racing whole-entry rewrites. * Update weed/server/filer_grpc_server.go Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * filer: test set_content FileSize sync; note chosen content-patch approach Cover the FileSize behavior of a set_content patch: a file's size follows the new content length (including when it shrinks), a directory's stays zero. Also document, in the bucket-config design, that extending PATCH_EXTENDED with set_content is the implemented path for content-backed config. --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>