Re: [PATCH v4 6/6] f2fs/009: detect and repair nlink corruption

[Chao Yu <chao@kernel.org>]

On 3/25/25 09:07, Zorro Lang wrote:
> On Wed, Mar 12, 2025 at 03:23:09PM +0800, Chao Yu wrote:
>> 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.
>>
>> Cc: Jaegeuk Kim <jaegeuk@kernel.org>
>> Signed-off-by: Chao Yu <chao@kernel.org>
>> ---
>> v4:
>> - remove unnecessary "_require_command fsck.f2fs"
>> - clean up _fixed_by_git_commit line
>> - fix to clean all tmp files in _cleanup
>>  tests/f2fs/009     | 147 +++++++++++++++++++++++++++++++++++++++++++++
>>  tests/f2fs/009.out |   2 +
>>  2 files changed, 149 insertions(+)
>>  create mode 100755 tests/f2fs/009
>>  create mode 100644 tests/f2fs/009.out
>>
>> diff --git a/tests/f2fs/009 b/tests/f2fs/009
>> new file mode 100755
>> index 00000000..9120d8a5
>> --- /dev/null
>> +++ b/tests/f2fs/009
>> @@ -0,0 +1,147 @@
>> +#! /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
>> +
>> +if [ ! -x "$(type -P socket)" ]; then
> 
> Hi Chao,
> 
> Which package provides this "socket" command? I tried to search it in Fedora, but
> got nothing:
> 
>   # yum search */socket
>   Updating and loading repositories:
>    Fedora - Rawhide - Developmental packages for the next Fedora release                                              100% |  19.1 KiB/s |  23.6 KiB |  00m01s
>    Fedora - Rawhide - Developmental packages for the next Fedora release                                              100% | 694.7 KiB/s |   6.9 MiB |  00m10s
>   Repositories loaded.
>   No matches found.
> 
> If it's a program by yourself, we might can put it in xfstests/src/socket.c?

Hi Zorro,

It's not a program from me, I just installed it w/ "sudo apt install socket", can
you try that?

Thanks,

> 
> Thanks,
> Zorro
> 
>> +	_notrun "Couldn't find socket"
>> +fi
>> +
>> +_require_scratch
>> +_require_command "$F2FS_INJECT_PROG" inject.f2fs
>> +
>> +_fixed_by_git_commit f2fs-tools 958cd6e \
>> +	"fsck.f2fs: support to repair corrupted i_links"
>> +
>> +filename=$SCRATCH_MNT/foo
>> +hardlink=$SCRATCH_MNT/bar
>> +
>> +_cleanup()
>> +{
>> +	if [ -n "$pid" ]; then
>> +		kill $pid &> /dev/null
>> +		wait
>> +	fi
>> +	cd /
>> +	rm -r -f $tmp.*
>> +}
>> +
>> +for ((i=0;i<14;i++)) do
>> +	echo "round: " $i >> $seqres.full
>> +
>> +	_scratch_mkfs >> $seqres.full
>> +	_scratch_mount
>> +
>> +	if [ $i == 0 ]; then
>> +		touch $filename
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=0
>> +	elif [ $i == 1 ]; then
>> +		mkdir $filename
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=1
>> +	elif [ $i == 2 ]; then
>> +		mknod $filename c 9 0
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=0
>> +	elif [ $i == 3 ]; then
>> +		mknod $filename b 8 0
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=0
>> +	elif [ $i == 4 ]; then
>> +		mkfifo $filename
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=0
>> +	elif [ $i == 5 ]; then
>> +		socket -s $filename >> $seqres.full 2>&1 &
>> +		pid=$!
>> +		sleep 2
>> +		ino=`stat -c '%i' $filename`
>> +		kill $pid >> $seqres.full 2>&1
>> +		nlink=0
>> +	elif [ $i == 6 ]; then
>> +		ln -s $SCRATCH_MNT/empty $filename
>> +		ino=`stat -c '%i' $filename`
>> +		nlink=0
>> +	elif [ $i == 7 ]; then
>> +		# orphan inode
>> +		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
>> +		nlink=1
>> +	elif [ $i == 8 ]; then
>> +		# hardlink on file
>> +		touch $filename
>> +		ino=`stat -c '%i' $filename`
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	elif [ $i == 9 ]; then
>> +		# hardlink on charactor
>> +		mknod $filename c 9 0
>> +		ino=`stat -c '%i' $filename`
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	elif [ $i == 10 ]; then
>> +		# hardlink on blockdev
>> +		mknod $filename b 8 0
>> +		ino=`stat -c '%i' $filename`
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	elif [ $i == 11 ]; then
>> +		# hardlink on pipe
>> +		mkfifo $filename
>> +		ino=`stat -c '%i' $filename`
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	elif [ $i == 12 ]; then
>> +		# hardlink on socket
>> +		socket -s $filename >> $seqres.full 2>&1 &
>> +		pid=$!
>> +		sleep 2
>> +		ino=`stat -c '%i' $filename`
>> +		kill $pid >> $seqres.full 2>&1
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	elif [ $i == 13 ]; then
>> +		# hardlink on symlink
>> +		ln -s $SCRATCH_MNT/empty $filename
>> +		ino=`stat -c '%i' $filename`
>> +		ln $filename $hardlink
>> +		nlink=0
>> +	fi
>> +
>> +	if [ $i != 7 ]; then
>> +		stat $SCRATCH_MNT/* >> $seqres.full
>> +	fi
>> +	echo "ino:"$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
>> +done
>> +
>> +echo "Silence is golden"
>> +
>> +status=0
>> +exit
>> diff --git a/tests/f2fs/009.out b/tests/f2fs/009.out
>> new file mode 100644
>> index 00000000..7e977155
>> --- /dev/null
>> +++ b/tests/f2fs/009.out
>> @@ -0,0 +1,2 @@
>> +QA output created by 009
>> +Silence is golden
>> -- 
>> 2.48.1
>>
>