[release/6.0] Align preallocationSize behavior#59078

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github-actions[bot] wants to merge 9 commits intorelease/6.0from

backport/pr-58726-to-release/6.0

Commits on Sep 14, 2021

there should be no differences between OSes:

adamsitnik
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align Windows implementation to behave like the Unix one

adamsitnik
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ensure files cant be shrinked on Unix-like systems that dont implement posix_fallocate

adamsitnik
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hopefully fix the Linux build

adamsitnik
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address code review feedback

adamsitnik
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FileMode.OpenOrCreate: don't change existing files

adamsitnik
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reduce code duplication

adamsitnik
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Apply suggestions from code review

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update the comment, fix the build and remove unused parameter

adamsitnik
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github-actions
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