* filer: synchronize stream pins and release them on transitions
Guard chunkStream.cacher with the ReaderCache lock everywhere: mount
sections share one ChunkReadAt across concurrent reads, and unsynchronized
release could double-unpin. Reads served from the chunk cache now detach
the stream's pin instead of retaining the previous chunk. Eviction prefers
unpinned downloaders so a pinned buffer is not dropped mid-stream. A new
ReleaseStream lets callers drop their pin without destroying the shared
cache; S3 and WebDAV readers use it. lastChunkFid becomes atomic since
concurrent mount reads can update it.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: keep eviction bounded when every downloader is pinned
Both eviction paths still fall back to a pinned victim when no unpinned
one exists, so abandoned stream pins cannot bypass the downloader limit
or stall the memory budget. Budget eviction also rechecks the pin under
the ReaderCache lock at removal time: a stream that pinned the selected
victim in between keeps it mapped and the selection retries.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: restore budget bookkeeping when a victim gets pinned mid-eviction
removeUnpinned losing the pin race left the victim out of the idle list
while still holding its reservation, making it unevictable even as the
pinned fallback. Push it back when the reservation is still live.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---------
Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
see https://blog.aqwari.net/xml-schema-go/
1. go get aqwari.net/xml/cmd/xsdgen
2. Add EncodingType element for ListBucketResult in AmazonS3.xsd
3. xsdgen -o s3api_xsd_generated.go -pkg s3api AmazonS3.xsd
4. Remove empty Grantee struct in s3api_xsd_generated.go
5. Remove xmlns: sed s'/http:\/\/s3.amazonaws.com\/doc\/2006-03-01\/\ //' s3api_xsd_generated.go
9b3b12c607