#! /bin/bash
# FS QA Test No. 337
#
# Corrupt the realtime rmapbt and see how the kernel and xfs_repair deal.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016, Oracle and/or its affiliates.  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 -rf "$tmp".*
}

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

# real QA test starts here
_supported_os Linux
_supported_fs xfs
_require_realtime
_require_xfs_scratch_rmapbt
_require_test_program "punch-alternating"
_require_xfs_io_command "falloc"
_disable_dmesg_check

rm -f "$seqres.full"

echo "+ create scratch fs"
_scratch_mkfs | _filter_mkfs 2>$tmp.mkfs >/dev/null
. $tmp.mkfs
cat $tmp.mkfs > "$seqres.full" 2>&1

echo "+ mount fs image"
_scratch_mount
blksz="$(get_block_size $SCRATCH_MNT)"

# inode core size is at least 176 bytes; btree header is 56 bytes;
# rtrmap record is 32 bytes; and rtrmap key/pointer are 56 bytes.
i_ptrs=$(( (isize - 176) / 56 ))
bt_ptrs=$(( (blksz - 56) / 56 ))
bt_recs=$(( (blksz - 56) / 32 ))

blocks=$((i_ptrs * bt_ptrs * bt_recs + 1))
_require_fs_space $SCRATCH_MNT $(( (2 * blocks * blksz) * 5 / 4096 ))
len=$((blocks * blksz))

echo "+ make some files"
$XFS_IO_PROG -f -R -c "falloc 0 $len" -c "pwrite -S 0x68 -b 1048576 0 $len" $SCRATCH_MNT/f1 >> $seqres.full
$XFS_IO_PROG -f -R -c "falloc 0 $len" -c "pwrite -S 0x68 -b 1048576 0 $len" $SCRATCH_MNT/f2 >> $seqres.full
./src/punch-alternating $SCRATCH_MNT/f1 >> "$seqres.full"
./src/punch-alternating $SCRATCH_MNT/f2 >> "$seqres.full"
_scratch_unmount

echo "+ check fs"
_scratch_xfs_repair -n >> $seqres.full 2>&1 || echo "xfs_repair should not fail"

echo "+ corrupt image"
_scratch_xfs_db -x -c "sb" -c "addr rrmapino" -c "addr u3.rtrmapbt.ptrs[1]" \
	-c "stack" -c "blocktrash -x 4096 -y 4096 -n 8 -3 -z" \
	>> $seqres.full 2>&1

echo "+ mount image"
_scratch_mount

echo "+ copy more"
$XFS_IO_PROG -f -R -c "pwrite -S 0x68 0 1" $SCRATCH_MNT/e3 >> $seqres.full 2>&1
test -s ${SCRATCH_MNT}/f3 && echo "should not be able to copy with busted rtrmap btree"
_scratch_unmount

echo "+ repair fs"
_repair_scratch_fs >> $seqres.full 2>&1

echo "+ mount image (2)"
_scratch_mount

echo "+ copy more (2)"
$XFS_IO_PROG -f -R -c "pwrite -S 0x68 0 1" $SCRATCH_MNT/e4 >> $seqres.full

# success, all done
status=0
exit