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@xxxxxxxxxx>
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
tests/f2fs/009 | 142 +++++++++++++++++++++++++++++++++++++++++++++
tests/f2fs/009.out | 2 +
2 files changed, 144 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..8f6a3e11
--- /dev/null
+++ b/tests/f2fs/009
@@ -0,0 +1,142 @@
+#! /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
+
+dir=$SCRATCH_MNT
+filename=$dir/foo
+hardlink=$dir/bar
+
+for ((i=0;i<14;i++)) do
+ echo "round: " $i >> $seqres.full
+
+ _scratch_mkfs "-f" >> $seqres.full
+ _scratch_mount >> $seqres.full
+
+ if [ $i == 0 ]; then
+ touch $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=0
+ elif [ $i == 1 ]; then
+ mkdir $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=1
+ elif [ $i == 2 ]; then
+ mknod $filename c 9 0
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=0
+ elif [ $i == 3 ]; then
+ mknod $filename b 8 0
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=0
+ elif [ $i == 4 ]; then
+ mkfifo $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=0
+ elif [ $i == 5 ]; then
+ socket -s $filename >> $seqres.full 2>&1 &
+ pid=$!
+ sleep 2
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ kill $pid >> $seqres.full 2>&1
+ nlink=0
+ elif [ $i == 6 ]; then
+ ln -s $dir/empty $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ nlink=0
+ elif [ $i == 7 ]; then
+ # orphan inode
+ touch $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ $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 $dir/ >> $seqres.full
+ sleep 6
+ nlink=1
+ elif [ $i == 8 ]; then
+ # hardlink on file
+ touch $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ ln $filename $hardlink
+ nlink=0
+ elif [ $i == 9 ]; then
+ # hardlink on charactor
+ mknod $filename c 9 0
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ ln $filename $hardlink
+ nlink=0
+ elif [ $i == 10 ]; then
+ # hardlink on blockdev
+ mknod $filename b 8 0
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ ln $filename $hardlink
+ nlink=0
+ elif [ $i == 11 ]; then
+ # hardlink on pipe
+ mkfifo $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ ln $filename $hardlink
+ nlink=0
+ elif [ $i == 12 ]; then
+ # hardlink on socket
+ socket -s $filename >> $seqres.full 2>&1 &
+ pid=$!
+ sleep 2
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ kill $pid >> $seqres.full 2>&1
+ ln $filename $hardlink
+ nlink=0
+ elif [ $i == 13 ]; then
+ # hardlink on symlink
+ ln -s $dir/empty $filename
+ ino=`stat $filename | awk '/Inode:/ {print $4}'`
+ ln $filename $hardlink
+ nlink=0
+ fi
+
+ if [ $i != 7 ]; then
+ stat $dir/* >> $seqres.full
+ fi
+ echo "ino:"$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
+ if [ $? != 0 ]; then
+ exit
+ fi
+
+ export FSCK_OPTIONS="-f"
+ _repair_scratch_fs >> $seqres.full
+ if [ $? != 1 ]; then
+ _fail "fsck can not detect and repair zero nlink corruption "$i
+ exit
+ fi
+
+ export FSCK_OPTIONS=""
+ _check_scratch_fs >> $seqres.full
+ if [ $? != 0 ]; then
+ _fail "fsck hasn't fixed nlink corruption "$i
+ exit
+ fi
+
+ _scratch_mount >> $seqres.full
+ _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
