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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 070
#
# As part of superblock verification, xfs_repair checks the primary sb and
# verifies all secondary sb's against the primary. In the event of geometry
# inconsistency, repair uses a heuristic that tracks the most frequently
# occurring settings across the set of N (agcount) superblocks.
#
# xfs_repair was subject to a bug that disregards this heuristic in the event
# that the last secondary superblock in the fs is corrupt. The side effect is an
# unnecessary and potentially time consuming brute force superblock scan.
#
# This is a regression test for the aforementioned xfs_repair bug. We
# intentionally corrupt the last superblock in the fs, run xfs_repair and
# verify it repairs the fs correctly. We explicitly detect a brute force scan
# and abort the repair to save time in the failure case.
#
. ./common/preamble
_begin_fstest auto quick repair
# Override the default cleanup function.
_cleanup()
{
cd /
rm -f $tmp.*
$KILLALL_PROG -9 $XFS_REPAIR_PROG > /dev/null 2>&1
wait > /dev/null 2>&1
}
# Start and monitor an xfs_repair of the scratch device. This test can induce a
# time consuming brute force superblock scan. Since a brute force scan means
# test failure, detect it and end the repair.
_xfs_repair_noscan()
{
# invoke repair directly so we can kill the process if need be
[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
log_repair_opts="-l $SCRATCH_LOGDEV"
[ "$USE_EXTERNAL" = yes ] && [ -n "$SCRATCH_RTDEV" ] && \
rt_repair_opts="-r $SCRATCH_RTDEV"
$XFS_REPAIR_PROG $log_repair_opts $rt_repair_opts $SCRATCH_DEV 2>&1 |
tee -a $seqres.full > $tmp.repair &
repair_pid=$!
# monitor progress for as long as it is running
while [ `pgrep xfs_repair` ]; do
grep "couldn't verify primary superblock" $tmp.repair \
> /dev/null 2>&1
if [ $? == 0 ]; then
# we've started a brute force scan. kill repair and
# fail the test
kill -9 $repair_pid >> $seqres.full 2>&1
wait >> $seqres.full 2>&1
_fail "xfs_repair resorted to brute force scan"
fi
sleep 1
done
wait
cat $tmp.repair | _filter_repair
}
# Import common functions.
. ./common/filter
. ./common/repair
# real QA test starts here
# Modify as appropriate.
_supported_fs xfs
_require_scratch_nocheck
_require_command "$KILLALL_PROG" killall
_scratch_mkfs | _filter_mkfs > /dev/null 2> $tmp.mkfs
test "${PIPESTATUS[0]}" -eq 0 || _fail "mkfs failed"
. $tmp.mkfs # import agcount
# corrupt the last secondary sb in the fs
_scratch_xfs_db -x -c "sb $((agcount - 1))" -c "type data" \
-c "write fill 0xff 0 512"
# attempt to repair
_xfs_repair_noscan
# success, all done
status=0
exit
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