> The reason why the write operation is delayed is because of
performance.

Yup, I understand that and I'm all for it. Delay writing for hours if
that improves performance further, that's great. But the question
remains: why is the _truncate_ operation not delayed as well? The gap
between the truncate and the write is what creates a window where
crashing the system leads to data loss. That gap should be closed, not
by "un-delaying" the write (which reduces performance), but by delaying
the truncate (which should, if anything, improve performance).

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Ext4 data loss
https://bugs.launchpad.net/bugs/317781
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