#! /bin/bash
# FS QA Test 264
#
# Test XFS EIO error handling configuration. Stop XFS from retrying
# to writeback forever when hit EIO.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016 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.*
	_dmerror_cleanup
}

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

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

# real QA test starts here
_supported_fs xfs
_supported_os Linux
_require_dm_target error
_require_scratch
_require_fs_sysfs error/fail_at_unmount
_require_fs_sysfs error/metadata/EIO/max_retries
_require_fs_sysfs error/metadata/EIO/retry_timeout_seconds

_scratch_mkfs >> $seqres.full 2>&1
_dmerror_init

do_test()
{
	local attr="$1"
	local num=0

	_dmerror_mount
	_reset_xfs_sysfs_error_handling $DMERROR_DEV
	# Disable fail_at_unmount before test EIO error handling
	_set_fs_sysfs_attr $DMERROR_DEV error/fail_at_unmount 0
	echo -n "error/fail_at_unmount="
	_get_fs_sysfs_attr $DMERROR_DEV error/fail_at_unmount

	_set_fs_sysfs_attr $DMERROR_DEV $attr 1
	num=`_get_fs_sysfs_attr $DMERROR_DEV $attr`
	echo "$attr=$num"
	# _fail the test if we fail to set $attr to 1, because the test
	# probably will hang in such case and block subsequent tests.
	if [ "$num" != "1" ]; then
		_fail "Failed to set $attr: 1"
	fi

	# start a metadata-intensive workload, but no data allocation operation.
	# Because uncompleted new space allocation I/Os may cause XFS to shutdown
	# after loading error table.
	$FSSTRESS_PROG -z -n 5000 -p 10 \
		       -f creat=10 \
		       -f resvsp=1 \
		       -f truncate=1 \
		       -f punch=1 \
		       -f chown=5 \
		       -f mkdir=5 \
		       -f rmdir=1 \
		       -f mknod=1 \
		       -f unlink=1 \
		       -f symlink=1 \
		       -f rename=1 \
		       -d $SCRATCH_MNT/fsstress >> $seqres.full 2>&1

	# Loading error table without "--nolockfs" option. Because "--nolockfs"
	# won't freeze fs, then some running I/Os may cause XFS to shutdown
	# prematurely. That's not what we want to test.
	_dmerror_load_error_table lockfs
	_dmerror_unmount

	# Mount again to replay log after loading working table, so we have a
	# consistent XFS after test.
	_dmerror_load_working_table
	_dmerror_mount
	_dmerror_unmount
}

#### Test EIO/max_retries ####
# Set EIO/max_retries a limited number(>-1), then even if fail_at_unmount=0,
# the test won't hang.
echo "=== Test EIO/max_retries ==="
do_test error/metadata/EIO/max_retries

#### Test EIO/retry_timeout_seconds ####
# Set EIO/retry_timeout_seconds to a limited number(>0), then even if
# fail_at_unmount=0, the test won't hang.
echo "=== Test EIO/retry_timeout_seconds ==="
do_test error/metadata/EIO/retry_timeout_seconds

# success, all done
status=0
exit
