[new release] index and index-bench (1.3.1)

[samoht]

A platform-agnostic multi-level index for OCaml

• Project page: https://github.com/mirage/index
• Documentation: https://mirage.github.io/index/

CHANGES:

Fixed

• Reduce allocations during merge (Reduce allocations during merge mirage/index#274, merge: only decode the value when necessary mirage/index#277)

• Protect concurrent syncs with a lock (protect sync with a lock mirage/index#309)

• Fixed a performance issue for Index.sync when there is a blocking merge in
  progress: the log_async file was not cached properly and fully reloaded
  from disk every time. (Do not reload log_async on every sync mirage/index#310)

• Release the merge lock if a merge raises an exception (index: release the merge lock if a merge raises an exception mirage/index#312)

• Added fsync after Index.clear to signal more quickly to read-only instances
  than something has changed in the file (use fsync to flush metadata when reoperning a file with new headers mirage/index#308)

Changed

• Specialise IO.v to create read-only or read-write instances. (Specialise v to readonly and readwrite instances mirage/index#291)

• clear removes the files on disks and opens new ones containing only the
  header. (Remove files on disk on clear mirage/index#288, Simplifications on top of #288 mirage/index#307, Simplify clear again mirage/index#317)

[camelus]

Commit: cc6a189

A pull request by opam-seasoned @samoht.

☀️ All lint checks passed cc6a189

• These packages passed lint tests: index-bench.1.3.1, index.1.3.1

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☀️ Installability check (+2)

• new installable packages (2): index.1.3.1 index-bench.1.3.1