[PATCH] f2fs/005: add testcase to check checkpoint disabling functionality

[Chao Yu <chao@kernel.org>]

This patch introduce a regression test to check whether f2fs handles
dirty inode correctly when checkpoint is disabled in a corner case,
it may hang umount before the bug is fixed.

Cc: Qi Han <hanqi@vivo.com>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 tests/f2fs/005     | 59 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/005.out |  1 +
 2 files changed, 60 insertions(+)
 create mode 100755 tests/f2fs/005
 create mode 100644 tests/f2fs/005.out

diff --git a/tests/f2fs/005 b/tests/f2fs/005
new file mode 100755
index 00000000..4faf1bb9
--- /dev/null
+++ b/tests/f2fs/005
@@ -0,0 +1,59 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oppo.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/005
+#
+# This is a regression test to check whether f2fs handles dirty
+# inode correctly when checkpoint is disabled, it may hang umount
+# before the bug is fixed.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	rm -f $img
+	rmdir $mnt
+	_scratch_unmount >> $seqres.full
+	cd /
+	rm -r -f $tmp.*
+}
+
+_require_scratch
+_scratch_mkfs >> $seqres.full
+_scratch_mount >> $seqres.full
+
+img=$SCRATCH_MNT/f2fs.img
+mnt=$SCRATCH_MNT/f2fs.mnt
+testfile=$mnt/testfile
+tmpfile=$mnt/tmpfile
+tmpdir=$mnt/tmpdir
+
+mkdir $mnt
+dd if=/dev/zero of=$img bs=1M count=50 2>/dev/null
+$MKFS_F2FS_PROG -f $img >/dev/null 2>&1
+sync
+
+# use mode=lfs to let f2fs always triggers OPU
+mount -t $FSTYP -o loop,mode=lfs,checkpoint=disable:10%,noinline_dentry $img $mnt
+
+dd if=/dev/zero of=$testfile bs=1M count=5 2>/dev/null
+mkdir $tmpdir
+touch $tmpfile
+sync
+
+# it dirties tmpdir inode by updating ctime,
+# but it doesn't moving the inode to gdirty_list.
+mv $tmpfile $tmpdir
+
+# it runs out of free segment
+dd if=/dev/zero of=$testfile bs=1M count=5 conv=notrunc conv=fsync 2>/dev/null
+
+mount -o remount,checkpoint=enable $mnt
+
+# it may hang umount if tmpdir is still dirty during evict()
+umount $mnt
+
+status=0
+exit
diff --git a/tests/f2fs/005.out b/tests/f2fs/005.out
new file mode 100644
index 00000000..caa3c880
--- /dev/null
+++ b/tests/f2fs/005.out
@@ -0,0 +1 @@
+QA output created by 005
-- 
2.40.1