tests/f2fs/009

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2025 Chao Yu.  All Rights Reserved.
#
# FS QA Test No. f2fs/009
#
# This is a regression test to check whether fsck can handle corrupted
# nlinks correctly, it uses inject.f2fs to inject nlinks w/ wrong value,
# and expects fsck.f2fs can detect such corruption and do the repair.
#
. ./common/preamble
_begin_fstest auto quick

_require_scratch
_require_inject_f2fs_command node i_links
_require_command "$(type -P socket)" socket

_fixed_by_git_commit f2fs-tools 958cd6e \
	"fsck.f2fs: support to repair corrupted i_links"

filename=$SCRATCH_MNT/foo
hardlink=$SCRATCH_MNT/bar

_cleanup()
{
	if [ -n "$pid" ]; then
		kill $pid &> /dev/null
		wait
	fi
	cd /
	rm -r -f $tmp.*
}

inject_and_check()
{
	local nlink=$1
	local ino=$2

	echo "ino:"$ino >> $seqres.full
	echo "nlink:"$nlink >> $seqres.full

	_scratch_unmount

	$F2FS_INJECT_PROG --node --mb i_links --nid $ino --val $nlink $SCRATCH_DEV \
		>> $seqres.full || _fail "fail to inject"

	_check_scratch_fs >> $seqres.full 2>&1 && _fail "can't find corruption"
	_repair_scratch_fs >> $seqres.full
	_check_scratch_fs >> $seqres.full 2>&1 || _fail "fsck can't fix corruption"

	_scratch_mount
	_scratch_unmount

	_scratch_mkfs >> $seqres.full
	_scratch_mount
}

check_links()
{
	local nlink=$1
	local create_hardlink=$2
	local ino=$3

	if [ -z $ino ]; then
		ino=`stat -c '%i' $filename`
	fi

	if [ $create_hardlink == 1 ]; then
		ln $filename $hardlink
	fi

	inject_and_check $nlink $ino
}

_scratch_mkfs >> $seqres.full
_scratch_mount

touch $filename
check_links 0 0

mkdir $filename
check_links 1 0

mknod $filename c 9 0
check_links 0 0

mknod $filename b 8 0
check_links 0 0

mkfifo $filename
check_links 0 0

socket -s $filename >> $seqres.full 2>&1 &
pid=$!
sleep 2
ino=`stat -c '%i' $filename`
kill $pid >> $seqres.full 2>&1
sleep 2
check_links 0 0 $ino

ln -s $SCRATCH_MNT/empty $filename
check_links 0 0

touch $filename
ino=`stat -c '%i' $filename`
$F2FS_IO_PROG write 1 0 1 zero atomic_commit $filename 5000 >> $seqres.full 2>&1 &
stat $filename >> $seqres.full
rm $filename
$F2FS_IO_PROG shutdown 1 $SCRATCH_MNT/ >> $seqres.full
sleep 6
check_links 1 0 $ino

# hardlink
touch $filename
check_links 0 1

mknod $filename c 9 0
check_links 0 1

mknod $filename b 8 0
check_links 0 1

mkfifo $filename
check_links 0 1

socket -s $filename >> $seqres.full 2>&1 &
pid=$!
sleep 2
ino=`stat -c '%i' $filename`
kill $pid >> $seqres.full 2>&1
sleep 2
check_links 0 1 $ino

ln -s $SCRATCH_MNT/empty $filename
check_links 0 1

echo "Silence is golden"

status=0
exit