tests: test foreign users of thin-pool

Note: dmeventd should not need any notification and automatically
try to resize again when there is some metadata change.

test/shell/thin-foreign-dmeventd.sh

@@ -0,0 +1,104 @@
+#!/bin/sh
+
+# Copyright (C) 2016 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+# test foreing user of thin-pool
+
+SKIP_WITH_LVMLOCKD=1
+SKIP_WITH_LVMPOLLD=1
+
+. lib/inittest
+
+MOUNT_DIR=mnt
+
+cleanup_mounted_and_teardown()
+{
+	umount "$MOUNT_DIR" || true
+	dmsetup remove $THIN
+	vgremove -ff $vg
+	aux teardown
+}
+
+percent_() {
+	get lv_field $vg/pool data_percent | cut -d. -f1
+}
+
+#
+# Main
+#
+aux have_thin 1 0 0 || skip
+which mkfs.ext4 || skip
+
+aux prepare_dmeventd
+aux prepare_pvs 2 64
+
+vgcreate $vg -s 64K $(cat DEVICES)
+
+# Create named pool only
+lvcreate --errorwhenfull y -L2100K -T $vg/pool
+
+POOL="$vg-pool"
+THIN="${PREFIX}_thin"
+
+# Foreing user is using own ioctl command to create thin devices
+dmsetup message $POOL 0 "create_thin 0"
+dmsetup message $POOL 0 "set_transaction_id 0 1"
+
+dmsetup status
+# Once the transaction id has changed, lvm2 shall not be able to create thinLV
+fail lvcreate -V10 $vg/pool
+
+trap 'cleanup_mounted_and_teardown' EXIT
+
+# 20M thin device
+dmsetup create $THIN --table "0 40960 thin $DM_DEV_DIR/mapper/$POOL 0"
+
+dmsetup table
+dmsetup info -c
+
+mkdir "$MOUNT_DIR"
+# This mkfs fills 2.2MB pool over 95%
+# no autoresize is configured
+mkfs.ext4 "$DM_DEV_DIR/mapper/$THIN"
+test $(percent_) -gt 95
+mount "$DM_DEV_DIR/mapper/$THIN" "$MOUNT_DIR"
+
+pvchange -x n "$dev1" "$dev2"
+
+test $(percent_) -gt 95
+# Configure autoresize
+aux lvmconf 'activation/thin_pool_autoextend_percent = 10' \
+	    'activation/thin_pool_autoextend_threshold = 75'
+
+# Give it some time to left dmeventd do some work
+sleep 20
+
+# And check foreign thin device is still mounted
+mount | grep "$MOUNT_DIR" | grep "$THIN"
+test $(percent_) -gt 95
+
+pvchange -x y "$dev1" "$dev2"
+
+# FIXME: ATM tell dmeventd explicitely we've changed metadata
+#        however dmeventd shall be aware of any metadata change
+#        and automagically retry resize operation after that.
+lvchange --refresh $vg/pool
+
+# Give it some time and let dmeventd do some work
+for i in $(seq 1 15) ; do
+	test $(percent_) -ge 75 || break
+	sleep 1
+done
+
+test $(percent_) -lt 75
+
+# And check foreign thin device is still mounted
+mount | grep "$MOUNT_DIR" | grep "$THIN"