#! /bin/bash
# FS QA Test 108
#
# Test partial block device failure. Calls like fsync() should report failure
# on partial I/O failure, e.g. a single failed disk in a raid 0 stripe.
#
# Test motivated by an XFS bug, and this commit fixed the issue
# xfs: return errors from partial I/O failures to files
#
#-----------------------------------------------------------------------
# Copyright (c) 2015 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 /
	echo running > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/state
	$UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
	$LVM_PROG vgremove -f $vgname >>$seqres.full 2>&1
	$LVM_PROG pvremove -f $SCRATCH_DEV $SCSI_DEBUG_DEV >>$seqres.full 2>&1
	_put_scsi_debug_dev
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch_nocheck
_require_block_device $SCRATCH_DEV
_require_scsi_debug
_require_command "$LVM_PROG" lvm

lvname=lv_$seq
vgname=vg_$seq
rm -f $seqres.full

# _get_scsi_debug_dev returns a scsi debug device with 128M in size by default
SCSI_DEBUG_DEV=`_get_scsi_debug_dev`
if [ "$SCSI_DEBUG_DEV" == "" ]; then
	_fail "Failed to initialize scsi debug device"
fi
echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full

# create striped volume with 4MB stripe size
$LVM_PROG pvcreate -f $SCSI_DEBUG_DEV $SCRATCH_DEV >>$seqres.full 2>&1
$LVM_PROG vgcreate -f $vgname $SCSI_DEBUG_DEV $SCRATCH_DEV >>$seqres.full 2>&1
# We use yes pipe instead of 'lvcreate --yes' because old version of lvm
# (like 2.02.95 in RHEL6) don't support --yes option
yes | $LVM_PROG lvcreate -i 2 -I 4m -l 100%FREE -n $lvname $vgname \
	>>$seqres.full 2>&1
# wait for lv creation to fully complete
$UDEV_SETTLE_PROG >>$seqres.full 2>&1

# _mkfs_dev exits the test on failure, this makes sure test lv is created by
# above vgcreate/lvcreate operations
_mkfs_dev /dev/mapper/$vgname-$lvname

_mount /dev/mapper/$vgname-$lvname $SCRATCH_MNT

# create a test file with contiguous blocks which will span across the 2 disks
$XFS_IO_PROG -f -c "pwrite 0 16M" -c fsync $SCRATCH_MNT/testfile >>$seqres.full

# offline the scsi debug device
echo offline > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/state

# write to an allocated area of the test file with writes which spans both disks
# and call fsync, the fsync should report failure
$XFS_IO_PROG -c "pwrite -b 1M 0 6M" -c fsync $SCRATCH_MNT/testfile \
	>>$seqres.full

status=0
exit