Add a file system parameter: --fs_uri to db_stress and db_bench (#6878)
Summary: This pull request adds the parameter --fs_uri to db_bench and db_stress, creating a composite env combining the default env with a specified registered rocksdb file system. This makes it easier to develop and test new RocksDB FileSystems. The pull request also registers the posix file system for testing purposes. Examples: ``` $./db_bench --fs_uri=posix:// --benchmarks=fillseq $./db_stress --fs_uri=zenfs://nullb1 ``` zenfs is a RocksDB FileSystem I'm developing to add support for zoned block devices, and in that case the zoned block device is specified in the uri (a zoned null block device in the above example). Pull Request resolved: https://github.com/facebook/rocksdb/pull/6878 Reviewed By: siying Differential Revision: D23023063 Pulled By: ajkr fbshipit-source-id: 8b3fe7193ce45e683043b021779b7a4d547af247
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