[lvm-devel] main - tests: check full zeroing of thin-pool metadata

[Zdenek Kabelac]

Gitweb:        https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=ff1324d5952db6f79c2c916c4f4520b3338abf4f
Commit:        ff1324d5952db6f79c2c916c4f4520b3338abf4f
Parent:        71162b2b4e09c08f08457d923dcc552251bd3c83
Author:        Zdenek Kabelac <zkabelac at redhat.com>
AuthorDate:    Wed Jan 13 00:19:38 2021 +0100
Committer:     Zdenek Kabelac <zkabelac at redhat.com>
CommitterDate: Wed Jan 13 12:54:45 2021 +0100

tests: check full zeroing of thin-pool metadata

Check zeroing works on whole thin-pool metadata device.
---
 test/shell/thin-zero-meta.sh | 68 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/test/shell/thin-zero-meta.sh b/test/shell/thin-zero-meta.sh
new file mode 100644
index 000000000..6a15a7388
--- /dev/null
+++ b/test/shell/thin-zero-meta.sh
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2021 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 how zeroing of thin-pool metadata works
+
+SKIP_WITH_LVMLOCKD=1
+SKIP_WITH_LVMPOLLD=1
+
+export LVM_TEST_THIN_REPAIR_CMD=${LVM_TEST_THIN_REPAIR_CMD-/bin/false}
+
+. lib/inittest
+
+#
+# Main
+#
+aux have_thin 1 3 0 || skip
+aux have_cache 1 3 0 || skip
+
+aux prepare_vg 3 40000
+
+# Create mostly-zero devs only front of it has some 'real' back-end
+aux zero_dev "$dev1" "$(( $(get first_extent_sector "$dev1") + 8192 )):"
+aux zero_dev "$dev2" "$(( $(get first_extent_sector "$dev2") + 8192 )):"
+aux zero_dev "$dev3" "$(( $(get first_extent_sector "$dev3") + 8192 )):"
+
+# Prepare randomly filled 4M LV on dev2
+lvcreate -L16G -n $lv1 $vg "$dev2"
+dd if=/dev/urandom of="$DM_DEV_DIR/$vg/$lv1" bs=1M count=4 oflag=direct  || true
+lvremove -f $vg
+
+for i in 0 1
+do
+	aux lvmconf "allocation/zero_metadata = $i"
+
+	# Lvm2 should allocate metadata on dev2
+	lvcreate -T -L10G --poolmetadatasize 16G $vg/pool "$dev1" "$dev2"
+	lvchange -an $vg
+
+	lvs -ao+seg_pe_ranges $vg
+	lvchange -ay $vg/pool_tmeta --yes
+
+	# Skip past 1.2M which is 'created' by  thin-pool initialization
+	hexdump -C -n 200 -s 2000000 "$DM_DEV_DIR/$vg/pool_tmeta" | tee out
+
+	# When fully zeroed, it should be zero - so almost no output from hexdump
+	case "$i" in
+	0) test $(wc -l < out) -ge 10 ;; # should not be zeroed
+	1) test $(wc -l < out) -le 10 ;; # should be zeroed
+	esac
+
+	lvremove -f $vg/pool
+done
+
+# Check lvm2 spots error during full zeroing of metadata device
+aux error_dev "$dev2" "$(( $(get first_extent_sector "$dev2") + 32 )):"
+not lvcreate -T -L10G --poolmetadatasize 16G $vg/pool "$dev1" "$dev2" |& tee err
+grep "Failed to initialize logical volume" err
+
+vgremove -ff $vg