On Tue, Aug 17, 2021 at 6:49 PM Eric W. Biederman [off-list ref] wrote:

Matthew Wilcox [off-list ref] writes:

quoted

On Fri, Aug 13, 2021 at 05:49:19PM -0700, Andy Lutomirski wrote:

quoted

[0] we have mandatory locks, too. Sigh.

I'd love to remove that.  Perhaps we could try persuading more of the
distros to disable the CONFIG option first.

Yes.  The support is disabled in RHEL8.

If it helps, it seems to be enabled on the just released debian stable:
    $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.10.0-8-amd64
    CONFIG_MANDATORY_FILE_LOCKING=y

Also the new 5.13 kernel in experimental has it too:
    $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.13.0-trunk-amd64
    CONFIG_MANDATORY_FILE_LOCKING=y