#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc.  All Rights Reserved.
#
# FS QA Test 288
#
# When an attribute leaf block count is 0, xfs_repair should junk
# that leaf directly (as xfsprogs commit f714016).
#
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
. ./common/attr

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

# Modify as appropriate.
_supported_fs xfs
_supported_os Linux
_require_scratch
_require_attrs

# get block size ($dbsize) from the mkfs output
_scratch_mkfs_xfs 2>/dev/null | _filter_mkfs 2>$tmp.mkfs >/dev/null
. $tmp.mkfs

_scratch_mount

touch $SCRATCH_MNT/$seq.attrfile
inum=$(stat -c '%i' $SCRATCH_MNT/$seq.attrfile)

# To get an attr block leaf, we need to extend attr format to extent
# or btree format at least, and the max inode size is half of filesystem
# block size, so write half of block size attr to make sure attr
# out of local format.
maxisize=$((dbsize/2))
$SETFATTR_PROG -n "user.testattr${seq}" \
	       -v "$(perl -e "print 'v' x ${maxisize};")" \
	       $SCRATCH_MNT/$seq.attrfile

_scratch_unmount
# manually corrupt the XFS, by set the header count of attr to 0
_scratch_xfs_set_metadata_field "hdr.count" "0" \
				"inode $inum" "ablock 0" >> $seqres.full

# verify current xfs_db write command can set hdr.count to 0. Old xfsprogs
# can't do that on v5 filesystems.
count=$(_scratch_xfs_get_metadata_field "hdr.count" \
					"inode $inum" "ablock 0" 2> /dev/null)
if [ "$count" != "0" ]; then
	_notrun "xfs_db can't set attr hdr.count to 0"
fi

# make sure xfs_repair can find above corruption. If it can't, that
# means we need to fix this bug on current xfs_repair
_scratch_xfs_repair -n >> $seqres.full 2>&1
if [ $? -eq 0 ];then
	_fail "xfs_repair can't find the corruption"
else
	# If xfs_repair can find this corruption, then this repair
	# should junk above leaf attribute and fix this XFS.
	_scratch_xfs_repair >> $seqres.full 2>&1

	# Old xfs_repair maybe find and fix this corruption by
	# reset the first used heap value and the usedbytes cnt
	# in ablock 0. That's not what we want. So check if
	# xfs_repair has junked the whole ablock 0 by xfs_db.
	_scratch_xfs_db -x -c "inode $inum" -c "ablock 0" | \
		grep -q "no attribute data"
	if [ $? -ne 0 ]; then
		_fail "xfs_repair didn't junk the empty attr leaf"
	fi
fi

echo "Silence is golden"

# success, all done
status=0
exit