dmerror: exclude dmerror tests with mount -o dax

Same as we do for dm flakey. dm can't do dax.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <eguan@redhat.com>

common/dmerror

@@ -18,6 +18,11 @@
 #
 # common functions for setting up and tearing down a dmerror device
 
+echo $MOUNT_OPTIONS | grep -q dax
+if [ $? -eq 0 ]; then
+	_notrun "Cannot run tests with DAX on dmerror devices"
+fi
+
 _dmerror_init()
 {
 	local dm_backing_dev=$SCRATCH_DEV