* filer leveldb2: read cache and buffer sizes from filer.toml
The leveldb2 store hardcoded its block cache (32MiB) and write buffer
(16MiB) and offered no way to tune the table block size or compaction
table size. Optional block_cache_size_mb, write_buffer_size_mb,
block_size_kb and compaction_table_size_mb keys under [leveldb2] now
override them; zero or negative values keep the previous defaults.
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* filer leveldb2: document tuning options in scaffold filer.toml
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* filer leveldb2: saturate size options instead of overflowing int
The option fields take int, so a MiB config value past math.MaxInt/MiB
(e.g. 2048 on 32-bit) wrapped negative and goleveldb would panic sizing
the memtable. Clamp the product instead of the input.
* filer leveldb2: reject size options too large for int bytes
Clamping a MiB setting at math.MaxInt silently hands goleveldb a
different size than configured; fail Initialize on values that cannot
fit instead.
* filer leveldb3: same tunable cache, buffer, block and table sizes
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* filer leveldb2/3: exercise oversized-option rejection on 64-bit too
The tests skipped whenever int was 64-bit, but write_buffer_size_mb
values above MaxInt/1MiB still overflow there, so the rejection path
had no coverage on the primary platform. Use MaxInt/1MiB + 1 so the
rejection triggers on every platform.
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Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
