what are the guarantees about what happens if a computer crashes during a write()? is it possible for the file to end up with corrupted data at the end, or is each byte of the write atomic?
I've seen files end up padded with zeroes after an unsynced write and hard shutdown, many times. So either ext4 data=ordered does not work as advertised, isn't enabled by default on some systems, or something else is often broken further down the stack.
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Seriously, "history file corrupt" is a common zsh complaint for me after a hard shutdown (on several systems) and then I have to open it in vim and nuke the last line full of ^@.
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the way that tweet started sounded like the Tears In Rain monologue...
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Lots of distros run without data=ordered sadly
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