Basic vdo tests#10
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Add mounted_fs() for filesystem test setup with automatic cleanup, and the SLAB_BITS_SMALL constant. Assisted-by: Claude Opus 4.6 <claude-opus-4-6>
Converts Basic01.pm, BasicFSDedupe.pm, Create03.pm, and UDSTimeout01.pm to Python. basic_fs_dedupe_tests.py (from BasicFSDedupe.pm): - Disables lazy_itable_init on ext4 (via new fs.py enhancement) to prevent background metadata writes from skewing dedup stats - Tolerance widened for statistics verification: 0.1/0.05 vs Perl's 0.01 uds_timeout_tests.py (from UDSTimeout01.pm): - Perl uses configurable 100ms VDO timeout; Python relies on upstream dm_vdo's fixed 5000ms timeout exceeded by 6000ms dm-delay read delay - Dataset size reduced: 10 x 20,000 blocks (200K total) vs Perl's 10 x 150,000 (1.5M total) - Two-phase approach: populate UDS index on fast storage first, then restart VDO on dm-delay device - Uses dm-delay table-swap technique to avoid udev probe hang - Disables delay after 60 seconds to let remaining I/O drain quickly Infrastructure: - fs.py: Added lazy_itable_init parameter for ext4 formatting Assisted-by: Claude Opus 4.6 <claude-opus-4-6>
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