tests: check dmsetup remove --force

test/shell/snapshot-remove-dmsetup.sh

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+#!/bin/sh
+# Copyright (C) 2015 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# check if 'dmsetup --noflush' will work properly for mounted snapshot
+
+. lib/inittest
+
+which mkfs.ext2 || skip
+
+test -e LOCAL_LVMETAD && skip
+test -e LOCAL_LVMPOLLD && skip
+test -e LOCAL_CLVMD && skip
+
+aux prepare_vg 5
+
+# Create stacked device
+lvcreate --type snapshot -s -L10 -n $lv1 $vg --virtualsize 100M
+aux extend_filter_LVMTEST
+vgcreate $vg1 "$DM_DEV_DIR"/$vg/$lv1
+
+
+lvcreate -L20 -n $lv1 $vg1
+lvcreate -L10 -n snap -s $vg1/$lv1
+
+mkfs.ext2 "$DM_DEV_DIR/$vg1/snap"
+mkdir mnt
+mount -o errors=remount-ro "$DM_DEV_DIR/$vg1/snap" mnt
+
+# intetionally suspend layer bellow
+dmsetup suspend $vg-$lv1
+
+# now this should pass without blocking
+dmsetup suspend --noflush --nolockfs $vg1-snap
+
+# unlock device below
+dmsetup resume $vg-$lv1
+# so this will pass without blocking on udev
+# otherwise --noudevsync would be needed
+dmsetup resume $vg1-snap
+
+
+# Try how force removal works
+dmsetup suspend $vg-$lv1
+# needs to fail as device is still open
+not dmsetup remove --force $vg1-snap
+dmsetup resume $vg-$lv1
+
+# check it really is now 'error' target
+dmsetup table $vg1-snap | tee out
+grep error out
+
+umount mnt || true
+
+lvremove -f $vg1
+
+vgremove -ff $vg1
+vgremove -ff $vg