xfs: Regression test for invalid sb_logsunit

If log stripe unit isn't a multiple of the fs blocksize and
mounting, the invalid sb_logsunit leads to crash as soon as we try
to write to the log.

Signed-off-by: xiao yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/xfs/439

@@ -0,0 +1,85 @@
+#! /bin/bash
+# FS QA Test No. 439
+#
+# Regression test for commit:
+# 9c92ee2 ("xfs: validate sb_logsunit is a multiple of the fs blocksize")
+#
+# If log stripe unit isn't a multiple of the fs blocksize and mounting,
+# the invalid sb_logsunit leads to crash as soon as we try to write to
+# the log.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2018 FUJITSU.  All Rights Reserved.
+# Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+
+seq=`basename "$0"`
+seqres="$RESULT_DIR/$seq"
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1    # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	rm -rf $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_os Linux
+_supported_fs xfs
+_require_scratch
+# We corrupt XFS on purpose, and check if assert failures would crash system.
+_require_no_xfs_bug_on_assert
+
+rm -f "$seqres.full"
+
+# Format
+_scratch_mkfs > $seqres.full 2>&1 || _fail "mkfs failed"
+
+# Set logsunit to a value which is not a multiple of the fs blocksize
+blksz=$(_scratch_xfs_get_sb_field blocksize)
+_scratch_xfs_set_sb_field logsunit $((blksz - 1)) >> $seqres.full 2>&1
+
+# Check if logsunit is set correctly
+lsunit=$(_scratch_xfs_get_sb_field logsunit)
+[ $lsunit -ne $((blksz - 1)) ] && _notrun "failed to set sb_logsunit"
+
+# Mount and writing log may trigger a crash on buggy kernel
+# The fix applied kernel refuses to mount, so a mount failure is
+# expected
+if _scratch_mount >> $seqres.full 2>&1; then
+	for i in $(seq 1 1000); do
+		echo > ${SCRATCH_MNT}/$i
+	done
+	_scratch_unmount
+fi
+
+# We may trigger assert related WARNINGs if we corrupt log on a CONFIG_XFS_WARN
+# or CONFIG_XFS_DEBUG (when bug_on_assert is disabled) build, so filter them.
+_check_dmesg _filter_assert_dmesg
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit

tests/xfs/439.out

@@ -0,0 +1,2 @@
+QA output created by 439
+Silence is golden

tests/xfs/group

@@ -436,3 +436,4 @@
 436 auto quick clone fsr
 437 auto quick other
 438 auto quick quota dangerous
+439 auto quick fuzzers log