stress2: Added a regression test for mksnap_ffs(8)

tools/test/stress2/misc/snap13.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2023 Peter Holm <pho@FreeBSD.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+# Test mounting of snapshots for different UFS types
+
+# Seen: mount of a -O1 snapshot failed
+# Fixed by:
+# f1549d7d5229 Write out corrected superblock when creating a UFS/FFS snapshot.
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+
+set -u
+s=0
+m2=$((mdstart + 1))
+mp2=$mntpoint$m2
+[ -d $mp2 ] || mkdir -p $mp2
+mount | grep -q "on $mntpoint " && umount -f $mntpoint
+[ -c /dev/md$mdstart ] &&  mdconfig -d -u $mdstart
+[ -c /dev/md$m2 ] && mdconfig -d -u $m2
+mdconfig -a -t swap -s 2g -u $mdstart || exit 1
+for newfs_flags in "-O2" "-U" "-j" "-O1"; do
+	echo "newfs $newfs_flags md$mdstart"
+	newfs $newfs_flags md$mdstart > /dev/null
+	mount /dev/md$mdstart $mntpoint
+	touch $mntpoint/file
+
+	rm -f $mntpoint/.snap/stress2
+	mksnap_ffs $mntpoint $mntpoint/.snap/stress2 || { s=1; break; }
+	mdconfig -a -t vnode -f $mntpoint/.snap/stress2 -u $m2 -o readonly ||
+		{ s=2; break; }
+	mount -t ufs -o ro /dev/md$m2 $mp2 || {
+	    echo "mount of a $newfs_flags snapshot failed"
+	    dumpfs -s /dev/md$m2; s=3; break; }
+	[ -f $mp2/file ] || { s=4; ls -l $mp2; }
+	umount $mp2
+	mdconfig -d -u $m2
+	umount $mntpoint
+done
+mount | grep -q "on $mntpoint " && umount $mntpoint
+
+mdconfig -d -u $mdstart
+exit $s