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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 057
#
# Attempt to reproduce log recovery failure by writing corrupt log records over
# the last good tail in the log. The tail is force pinned while a workload runs
# the head as close as possible behind the tail. Once the head is pinned,
# corrupted log records are written to the log and the filesystem shuts down.
#
# While log recovery should handle the corrupted log records, it has historical
# problems dealing with the situation where the corrupted log records may have
# overwritten the tail of the previous good record in the log. If this occurs,
# log recovery may fail.
#
# This can be reproduced more reliably under non-default conditions such as with
# the smallest supported FSB sizes and/or largest supported log buffer sizes and
# counts (logbufs and logbsize mount options).
#
# Note that this test requires a DEBUG mode kernel.
#
. ./common/preamble
_begin_fstest auto log recoveryloop
# Override the default cleanup function.
_cleanup()
{
cd /
rm -f $tmp.*
$KILLALL_PROG -9 fsstress > /dev/null 2>&1
[ -e /sys/fs/xfs/$sdev/errortag/log_item_pin ] &&
echo 0 > /sys/fs/xfs/$sdev/errortag/log_item_pin
wait > /dev/null 2>&1
}
# Import common functions.
. ./common/inject
# real QA test starts here
# Modify as appropriate.
_supported_fs xfs
_require_xfs_io_error_injection log_item_pin
_require_xfs_io_error_injection log_bad_crc
_require_scratch
_require_command "$KILLALL_PROG" killall
echo "Silence is golden."
sdev=$(_short_dev $SCRATCH_DEV)
# use a small log fs
_scratch_mkfs_sized $((1024 * 1024 * 500)) >> $seqres.full 2>&1
_scratch_mount
# populate the fs with some data and cycle the mount to reset the log head/tail
$FSSTRESS_PROG -d $SCRATCH_MNT -z -fcreat=1 -p 4 -n 100000 >> $seqres.full
_scratch_cycle_mount || _fail "cycle mount failed"
# Pin the tail and start a file removal workload. File removal tends to
# reproduce the corruption more reliably.
_scratch_inject_error log_item_pin 1
rm -rf $SCRATCH_MNT/* > /dev/null 2>&1 &
workpid=$!
# wait for the head to stop pushing forward
prevhead=-1
head=`cat /sys/fs/xfs/$sdev/log/log_head_lsn`
while [ "$head" != "$prevhead" ]; do
sleep 5
prevhead=$head
head=`cat /sys/fs/xfs/$sdev/log/log_head_lsn`
done
# Once the head is pinned behind the tail, enable log record corruption and
# unpin the tail. All subsequent log buffer writes end up corrupted on-disk and
# result in log I/O errors.
_scratch_inject_error log_bad_crc 1
_scratch_inject_error log_item_pin 0
# wait for fs shutdown to kill the workload
wait $workpid
# cycle mount to test log recovery
_scratch_cycle_mount
# success, all done
status=0
exit
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