Nonsense, flush is added by default when mounting FAT volumes via udisks https://github.com/storaged-project/udisks/blob/7f690b06329adde019b0df6b69cdb3b25c90b6f6/src/udiskslinuxfilesystem.c#L383
You have presumably configured udisks not to do that, for some misbegotten reason.
Nonsense, flush is added by default when mounting FAT volumes via udisks /github. com/storaged- project/ udisks/ blob/7f690b0632 9adde019b0df6b6 9cdb3b25c90b6f6 /src/udiskslinu xfilesystem. c#L383
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You have presumably configured udisks not to do that, for some
misbegotten reason.