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由 Andrew Kryczka 提交于
Summary: `sync_file_range` returns `ENOSYS` on Windows Subsystem for Linux even when using a supposedly supported filesystem like ext4. To handle this case we can do a dynamic check that a no-op `sync_file_range` invocation, which is accomplished by passing zero for the `flags` argument, succeeds. Also I rearranged the function and comments to hopefully make it more easily understandable. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5416 Differential Revision: D15807061 fbshipit-source-id: d31d94e1f228b7850ea500e6199f8b5daf8cfbd3
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