tests/btrfs/146

#! /bin/bash
# FS QA Test No. 146
#
# Open a file several times, write to it, fsync on all fds and make sure that
# they all return 0. Change the device to start throwing errors. Write again
# on all fds and fsync on all fds. Ensure that we get errors on all of them.
# Then fsync on all one last time and verify that all return 0.
#
#-----------------------------------------------------------------------
# Copyright (c) 2017, Jeff Layton <jlayton@redhat.com>
#
# 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 -rf $tmp.* $testdir
    _dmerror_cleanup
}

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

# real QA test starts here
_supported_os Linux
_supported_fs btrfs
_require_dm_target error
_require_test_program fsync-err
_require_test_program dmerror

# bring up dmerror device
_scratch_unmount
_dmerror_init

# Replace first device with error-test device
old_SCRATCH_DEV=$SCRATCH_DEV
SCRATCH_DEV_POOL=`echo $SCRATCH_DEV_POOL | perl -pe "s#$SCRATCH_DEV#$DMERROR_DEV#"`
SCRATCH_DEV=$DMERROR_DEV

_require_scratch
_require_scratch_dev_pool

rm -f $seqres.full

echo "Format and mount"

# Build a filesystem with 2 devices that stripes the data across
# both devices, but mirrors metadata across both. Then, make one
# of the devices fail and test what it does.
_scratch_pool_mkfs "-d raid0 -m raid1" > $seqres.full 2>&1
_scratch_mount

# How much do we need to write? We need to hit all of the stripes. btrfs uses a
# fixed 64k stripesize, so write enough to hit each one. In the case of
# compression, each 128K input data chunk will be compressed to 4K (because of
# the characters written are duplicate). Therefore we have to write
# (128K * 16) = 2048K to make sure every stripe can be hit.
number_of_devices=`echo $SCRATCH_DEV_POOL | wc -w`
write_kb=$(($number_of_devices * 2048))
_require_fs_space $SCRATCH_MNT $write_kb

testfile=$SCRATCH_MNT/fsync-err-test

SCRATCH_DEV=$old_SCRATCH_DEV
$here/src/fsync-err -b $(($write_kb * 1024)) -d $here/src/dmerror $testfile

# success, all done
_dmerror_load_working_table

# fs may be corrupt after this -- attempt to repair it
_repair_scratch_fs >> $seqres.full

# remove dmerror device
_dmerror_cleanup

status=0
exit