https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260200

--- Comment #6 from Aleksandr Fedorov <afedo...@freebsd.org> ---
I think the swap backend should also ignore the BIO_FLUSH command. Because swap
is not a persistent storage, I don't know how BIO_FLUSH can be useful.

As for ctl(4), it works with SCSI commands. Ramdisk backend simply ignores the
SYNCHRONIZE_CACHE and SYNCHRONIZE_CACHE_16 commands:
https://github.com/freebsd/freebsd-src/blob/main/sys/cam/ctl/ctl_backend_ramdisk.c#L748

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