tests/xfs/115

#! /bin/bash
# FS QA Test 115
#
# Check if the filesystem will lockup when trying to allocate a new inode in
# an AG with no free inodes but with a corrupted agi->freecount showing free inodes.
#
# At the end of the test, the scratch device will purposely be in a corrupted
# state, so there is no need for checking that.
#-----------------------------------------------------------------------
# Copyright (c) 2017 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.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_supported_os Linux
_require_scratch_nocheck
# We corrupt XFS on purpose, and check if assert failures would crash system.
_require_no_xfs_bug_on_assert
_disable_dmesg_check

# Make sure we disable finobt if the filesystem supports it, otherwise, just
# initialize it with default options.
_scratch_mkfs | grep -q "finobt=1" && _scratch_mkfs -m "finobt=0" >/dev/null 2>&1

# Get the amount of free inodes from the AGI 0, so we can fill up the freecount
# structure.
freecount=`_scratch_xfs_db -c "agi 0" -c "p freecount" | cut -d' ' -f 3`

_scratch_mount

# At the end of filesystem's initialization, AG 0 will have $freecount free
# inodes in the agi->freecount, create $freecount extra dummy files to fill it.
for i in `seq 1 $freecount`; do
	touch $SCRATCH_MNT/dummy_file$i
done

_scratch_unmount

# agi->freecount is 0 here, corrupt it to show extra free inodes
_scratch_xfs_db -x -c "agi 0" -c "write freecount 10" >> $seqres.full 2>&1

_scratch_mount

# Lock up a buggy kernel
touch $SCRATCH_MNT/lockupfile >> $seqres.full 2>&1

# If we reach this point, the filesystem is fixed
echo "Silence is golden"
status=0
exit