On Wed, Dec 21, 2022 at 6:13 PM Demi Marie Obenour
<demioben...@gmail.com> wrote:
>

[...]

>
> Does vfat support atomic rename?  Is it possible to atomically upgrade
> a bootloader/UKI/etc?
> --

For Linux, renameat2 RENAME_EXCHANGE is supported in vfat since
version v6.0. The relevant commits FYI are:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=019a0c9e377c
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=204d03203a14
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=da87e1725ae2

Best regards,
Javier
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