Atomic file data replace API

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Hi,

Since non-durable appears to be controversial, let's consider the case
without that aspect.

Since the introduction of ext4, some apps/users have had issues with
file corruption after a system crash. It's not a bug in the FS AFAIK
and it's not exclusive to ext4.
Writing a temp file, fsync, rename is often proposed.
But how does one preserve meta-data, including file owner?

Olaf
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