How to disable asynchronous writes to storage?

[spamhog]

Vanessa, Linux 5.15.0-56-generic.

Is there a way to disable asynchronous writes to storage?

I can't find a use case where it's better to pretend that a slow write is finished when in reality it's not. Maybe when a gazillion small slow writes writes to a slow hard disk need to happen strictly sequentially with no chance/need to be interrupted, and will block an app from doing anything untill they are done? But when does that happen in reality?

My USB drives no longer have LEDs, so I no longer see that a write is still running which is prematurely reported as finished to userspace. Unmounting won't be allowed if the write is still ongoing. So after a write is reported finished I count to 10 before trying to unmount them, which is barbarous.

Already discussed here:
viewtopic.php?f=50&t=349917

Some unapplicable, related, funny IBM advice here:
rename IBM-issued libibmaio.so and libibmaiodbg.so
so IBM-issued WebSphere can't trigger them.
https://www.ibm.com/docs/en/filenet-p8- ... -libraries

[t42]

after a write is reported finished I count to 10 before trying to unmount them

You can't go wrong running sync and wait till shell prompt will appear.

[spamhog]

Thank you t42!

I thought sync only flushed hard disk onboard caches,
now I know it flushes memory caches to disk.