Jay Zhuang efd767d14a Fix build for io_uring (#9690)
Summary:
Minor fix for build failure:
```
./env/io_posix.h:68:33: error: unused parameter 'len' [-Werror=unused-parameter]
   68 |                          size_t len, size_t iov_len, bool async_read,
      |                          ~~~~~~~^~~
```
Only happens for release build with io_uring.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9690

Test Plan: build pass with io_uring

Reviewed By: akankshamahajan15

Differential Revision: D34846347

Pulled By: jay-zhuang

fbshipit-source-id: 2d7afb585097262d7722ef1beac486fc8ef28419
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.

Description
A library that provides an embeddable, persistent key-value store for fast storage.
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