Summary:
This is a follow up to https://github.com/facebook/rocksdb/issues/13177, which was supposed to disable the file system buffer optimization for compaction reads. However, it did not work as expected because I did not pass through `use_fs_buffer` to the `Read` method, which also calls `UseFSBuffer`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/13200
Test Plan:
I added simple tests to verify we do not hit the overflow issue when we are doing compaction prefetches.
```
./prefetch_test --gtest_filter="*FSBufferPrefetchForCompaction*"
```
Of course I will be looking through the warm storage crash test logs as well once the change is merged.
Reviewed By: anand1976
Differential Revision: D66996079
Pulled By: archang19
fbshipit-source-id: b4d9254f1354ccfc53a307174de5f2388b7e5474
5aead7af3d