dm mpath: remove unnecessary NVMe branching in favor of scsi_dh checks
This eliminates the "queue_mode" configuration's "nvme" mode. There
wasn't anything NVMe-specific about that mode. It was named "nvme"
because it was a short name for the mode. But the entire point of the
mode was to optimize the multipath target for underlying devices that
are _not_ SCSI-based. Devices that aren't SCSI have no need for the
various SCSI device handler (scsi_dh) specific code in DM multipath.
But rather than narrowly define this scsi_dh vs not branching in terms
of "nvme": invert the logic so that we're just checking whether a
multipath device is layered on SCSI devices with scsi_dh attached.
This allows any future storage technology to avoid scsi_dh specific code
in the multipath target too.
Fixes: 848b8aefd4 ("dm mpath: optimize NVMe bio-based support")
Suggested-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 file changed