We use a device mapper device on top of a loop device, the change in
rotational status does not always propagate if change it at the loop
device sysfs node.
Signed-off-by: David Sterba <dsterba@suse.com>
loopdev=`run_check_stdout $SUDO_HELPER losetup --find --show img`
run_check $SUDO_HELPER dmsetup create $dmname --table "0 1048576 linear $loopdev 0"
-base=`basename "$loopdev"`
+dmbase=`readlink -f $dmdev`
+base=`basename "$dmbase"`
rot=/sys/class/block/$base/queue/rotational
# switch rotational