On Wed, Oct 3, 2018 at 7:34 PM Bryan Gurney [off-list ref] wrote:

Right now, users of host-managed SMR drives should be using "deadline"
or "mq-deadline", to avoid out-of-order writes in sequential-only
zones.

I'm running into a situation right now on a test system (Fedora 28,
4.18.7 kernel) where I copied test data onto an F2FS filesystem, but I
accidentally forgot to add my "udev rule" file:

This should be fixed after
d5038a13eca7 scsi: core: switch to scsi-mq by default
right?

Since mq use mq-deadline by default.

I'm making sure to preserve mq-deadline on zoned devices
in my v2 of this patch.

Yours,
Linus Walleij