The first time a device returns ENOTSUP in repsonse to a flush request,
we set vdev_nowritecache so we don't issue flushes in the future and
instead just pretend the succeeded. However, we still return an error
for the initial flush, even though we just decided such errors are
meaningless!
So, when setting vdev_nowritecache in response to a flush error, also
reset the error code to assume success.
Along the way, it seems there's no good reason for vdev_disk & vdev_geom
to explicitly detect no support for flush and set vdev_nowritecache;
just letting the error through to zio_vdev_io_assess() will cause it all
to fall out nicely. So remove those checks.
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
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