Ignore async_io ReadOption if FileSystem doesn't support it (#11296)
Summary: In PosixFileSystem, IO uring support is opt-in. If the support is not enabled by the user, then ignore the async_io ReadOption in MultiGet and iteration at the top, rather than follow the async_io codepath and transparently switch to sync IO at the FileSystem layer. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11296 Test Plan: Add new unit tests Reviewed By: akankshamahajan15 Differential Revision: D44045776 Pulled By: anand1976 fbshipit-source-id: a0881bf763ca2fde50b84063d0068bb521edd8b9
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