[PATCH v2] f2fs: test for race condition in between atomic_write and dio

[Chao Yu <chao@kernel.org>]

Test that we will simulate sqlite atomic write logic w/ below steps:
1. create a regular file, and initialize it w/ 0xff data
2. start transaction (via F2FS_IOC_START_ATOMIC_WRITE) on it
3. write transaction data
4. trigger direct read/write IO to check whether it fails or not
5. commit and end the transaction (via F2FS_IOC_COMMIT_ATOMIC_WRITE)
This is a regression test to check handling of race condition in
between atomic_write and direct IO.

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
---
v2:
- add kill&wait in _clean() to avoid umount failure
- some cleanups
- use exported helpler
 tests/f2fs/004     | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/004.out |  3 +++
 2 files changed, 51 insertions(+)
 create mode 100755 tests/f2fs/004
 create mode 100644 tests/f2fs/004.out

diff --git a/tests/f2fs/004 b/tests/f2fs/004
new file mode 100755
index 00000000..d71e99ea
--- /dev/null
+++ b/tests/f2fs/004
@@ -0,0 +1,48 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oppo.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/004
+#
+# Test that we will simulate race case in between sqlite atomic write
+# and direct IO w/ below steps:
+# 1. create a regular file, and initialize it w/ 0xff data
+# 2. start transaction (via F2FS_IOC_START_ATOMIC_WRITE) on it
+# 3. write transaction data
+# 4. trigger direct read/write IO to check whether it fails or not
+# 5. commit and end the transaction (via F2FS_IOC_COMMIT_ATOMIC_WRITE)
+# This is a regression test to check handling of race condition in
+# between atomic_write and direct IO.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+. ./common/filter
+
+_cleanup()
+{
+	kill -9 $atomic_write_pid > /dev/null 2>&1
+	wait > /dev/null 2>&1
+}
+
+_require_scratch
+_require_odirect
+_scratch_mkfs >> $seqres.full
+_scratch_mount >> $seqres.full
+
+dbfile=$SCRATCH_MNT/dbfile
+
+# start atomic_write on dbfile & write data to dbfile
+touch $dbfile
+$F2FS_IO_PROG write 1 0 32 zero atomic_commit $dbfile 3000 >> $seqres.full &
+atomic_write_pid=$!
+
+# simulate concurrent direct read/write IO
+$XFS_IO_PROG -d -c "pread 0 128k" $dbfile
+$XFS_IO_PROG -d -c "pwrite 0 128k" $dbfile
+
+# wait for atomic_write commit completion
+sleep 5
+
+status=0
+exit
diff --git a/tests/f2fs/004.out b/tests/f2fs/004.out
new file mode 100644
index 00000000..3af79541
--- /dev/null
+++ b/tests/f2fs/004.out
@@ -0,0 +1,3 @@
+QA output created by 004
+pread: Operation not supported
+pwrite: Operation not supported
-- 
2.40.1