vfs_aio_ratelimit: rate-limiting module for async I/O

Shachar Sharonrequested to merge
samba-team/devel/samba:synarete/vfs_aio_ratelimit into master

A new stackable module to allow rate-limiting functionality for async I/O operations. When the number of IOPS or bytes-per-sec overflow a user-defined threshold, inject a delay before allowing an operation to complete, yielding an implicit throughput ceiling.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • (optional) This MR is just one part towards a larger feature.
  • (optional, if backport required) Bugzilla bug filed and BUG: tag added
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • CI timeout is 3h or higher (see Settings/CICD/General pipelines/ Timeout)

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to README.Coding.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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