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  1. MariaDB Server
  2. MDEV-21382

use fdatasync() for redo log where appropriate

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      Redo log files are fixed size files. They're almost never renamed. So, metadata is not changed. For such cases we can use `fdatasync()` which doesn't flush metadata, like `fsync()` does. That should bring use some performance.

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              Assignee:
              kevg Eugene Kosov
              Reporter:
              kevg Eugene Kosov
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