Atomic non-durable file write API

[Olaf van der Spek]

Hi,

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. However, the
durable aspect of fsync isn't always required and this way has other
issues.
What is the recommended way for atomic non-durable (complete) file writes?

I'm also wondering why FSs commit after open/truncate but before
write/close. AFAIK this isn't necessary and thus suboptimal.

Greetings,

Olaf
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