> On 31 Jan 2024, at 11:41, Florian Weimer <fwei...@redhat.com> wrote:
> 
> I think this is somewhat counteracted by Linux treating USB mass storage
> devices as not having write caches (according to dmesg at least).
> Doesn't this mean that those costly barriers won't be used?

Isn’t that a reference to caches within the drive and not the buffer cache in 
the kernel?
It is the kernel buffer cache flushing that eject/umount triggers getting 
written out.

Barry


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