Plan to send the patches upstream to dm-devel after finishing the following tasks

• Revise all the commits logs, and provide briefly test cases for every commits.
• Test against dmtest-python and device-mapper-test-suite

• • ref: xfs tests in linux.git  5b1fe7bec8a
• Add few more tests to dmtest-python if needed
  • There are a few tests already: https://github.com/mingnus/dmtest-python/commits/2025-06-02-passthrough-tests/