+#! /bin/bash
+# FS QA Test No. 141
+#
+# Use the XFS log record CRC error injection mechanism to test torn writes to
+# the log. The error injection mechanism writes an invalid CRC and shuts down
+# the filesystem. The test verifies that a subsequent remount recovers the log
+# and that the filesystem is consistent.
+#
+# Note that this test requires a DEBUG mode kernel.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015 Red Hat, Inc. All Rights Reserved.
+#
+# 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()
+{
+ cd /
+ rm -f $tmp.*
+ killall -9 fsstress > /dev/null 2>&1
+ wait > /dev/null 2>&1
+}
+
+rm -f $seqres.full
+
+# get standard environment, filters and checks
+. ./common/rc
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_supported_os Linux
+_require_xfs_sysfs $(_short_dev $TEST_DEV)/log/log_badcrc_factor
+_require_scratch
+
+echo "Silence is golden."
+
+_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
+_scratch_mount
+
+sdev=$(_short_dev $SCRATCH_DEV)
+
+for i in $(seq 1 5); do
+ # Enable error injection. Use a random bad crc factor up to 100
+ # (increase this value to run fsstress longer).
+ factor=$((RANDOM % 100 + 1))
+ echo iteration $i log_badcrc_factor: $factor >> $seqres.full 2>&1
+ echo $factor > /sys/fs/xfs/$sdev/log/log_badcrc_factor
+
+ # Run fsstress until the filesystem shuts down. It will shut down
+ # automatically when error injection triggers.
+ $FSSTRESS_PROG -d $SCRATCH_MNT -p 4 -n 999999 >> $seqres.full 2>&1
+
+ # Verify that we can remount the fs. Log recovery should handle the torn
+ # write.
+ _scratch_unmount
+ _scratch_mount || _fail "failed to mount"
+done
+
+# success, all done
+status=0
+exit