[f2fs-dev] [PATCH v2 2/2] f2fs/022: do sanity check on footer of non inode dnode

[Chao Yu via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

This is a regression test:
1. create foo & bar
2. write 8M data to foo
3. use inject.f2fs to inject i_nid[0] of foo w/ ino of bar
4. fpunch in foo w/ specified range

If we haven't applied kernel patch ("f2fs: fix to do sanity check on
node footer for non inode dnode"), f2fs may missed to do sanity check
on corrupted dnode, result in panic or deadloop in step 4).

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
v2:
- remove "_require_kernel_config CONFIG_F2FS_CHECK_FS"
- update comments a bit
 tests/f2fs/022     | 54 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/022.out |  2 ++
 2 files changed, 56 insertions(+)
 create mode 100755 tests/f2fs/022
 create mode 100644 tests/f2fs/022.out

diff --git a/tests/f2fs/022 b/tests/f2fs/022
new file mode 100755
index 00000000..ed3b4f2b
--- /dev/null
+++ b/tests/f2fs/022
@@ -0,0 +1,54 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 Chao Yu.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/022
+#
+# This is a regression test:
+# 1. create foo & bar
+# 2. write 8M data to foo
+# 3. use inject.f2fs to inject i_nid[0] of foo w/ ino of bar
+# 4. fpunch in foo w/ specified range
+#
+. ./common/preamble
+_begin_fstest auto quick rw
+
+. ./common/attr
+
+_fixed_by_kernel_commit xxxxxxxxxxxx \
+	"f2fs: fix to do sanity check on node footer for non inode dnode"
+
+_require_scratch_nocheck
+_require_command "$F2FS_INJECT_PROG" inject.f2fs
+
+# remove all mkfs options to avoid layout change of on-disk inode
+export MKFS_OPTIONS=""
+
+foo_path=$SCARTCH_MNT/foo
+bar_path=$SCARTCH_MNT/bar
+
+_scratch_mkfs >> $seqres.full
+_scratch_mount
+
+touch $foo_path
+touch $bar_path
+$XFS_IO_PROG $foo_path -c "pwrite 0 8M"
+sync
+foo_ino=`stat -c '%i' $foo_path`
+bar_ino=`stat -c '%i' $bar_path`
+_scratch_unmount
+
+# inject foo inode to replace i_nid[0] w/ to bar ino
+$F2FS_INJECT_PROG --node --mb i_nid --nid $foo_ino --idx 0 --val $bar_ino $SCRATCH_DEV >> $seqres.full || _fail "failed to inject"
+
+_scratch_mount
+
+# if CONFIG_F2FS_CHECK_FS is enabled, it will trigger a kernel panic,
+# otherwise, it will enter a deadloop.
+$XFS_IO_PROG $foo_path -c "fpunch 6984k 4k"
+_scratch_unmount
+
+echo "Silence is golden"
+
+status=0
+exit
diff --git a/tests/f2fs/022.out b/tests/f2fs/022.out
new file mode 100644
index 00000000..394c6a7c
--- /dev/null
+++ b/tests/f2fs/022.out
@@ -0,0 +1,2 @@
+QA output created by 022
+Silence is golden
-- 
2.40.1



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