How to umount a busy filesystem?

[Olaf Frączyk]

Hi,

Why I cannot umount filesystem if it is being accessed?
I tried MNT_FORCE option but it doesn't work.

Killing all processes that access a filesystem is not an option. They
should just get an error when accessing filesystem that is umounted.

Any idea how to do it?

Please CC me.

Regards,

Olaf Fraczyk

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