[jdk15u-dev] RFR: 8264821: DirectIOTest fails on a system with large block size

[Sergey Nazarkin]

I'd like to backport this fix for parity with jdk17/13/11. The patch applies cleanly.

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Commit messages:
 - Backport 7e4cd480206891550828d1fdfebae57ecc19ed37

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/51/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=51&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264821
  Stats: 33 lines in 1 file changed: 7 ins; 8 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/51.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/51/head:pull/51

PR: https://git.openjdk.java.net/jdk15u-dev/pull/51