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

[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 foreground GC to migrate data block of the file
5. commit and end the transaction (via F2FS_IOC_COMMIT_ATOMIC_WRITE)
6. check consistency of transaction w/ in-memory and on-disk data
This is a regression test to check handling of race condition in
between atomic_write and GC.

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 tests/f2fs/003     | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/f2fs/003.out | 11 +++++++++
 2 files changed, 72 insertions(+)
 create mode 100755 tests/f2fs/003
 create mode 100644 tests/f2fs/003.out

diff --git a/tests/f2fs/003 b/tests/f2fs/003
new file mode 100755
index 00000000..d8311c4c
--- /dev/null
+++ b/tests/f2fs/003
@@ -0,0 +1,61 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Oppo.  All Rights Reserved.
+#
+# FS QA Test No. f2fs/003
+#
+# 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 foreground GC to migrate data block of the file
+# 5. commit and end the transaction (via F2FS_IOC_COMMIT_ATOMIC_WRITE)
+# 6. check consistency of transaction w/ in-memory and on-disk data
+# This is a regression test to check handling of race condition in
+# between atomic_write and GC.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+. ./common/filter
+
+_supported_fs f2fs
+_require_scratch
+_require_xfs_io_command "pwrite"
+_require_xfs_io_command "fpunch"
+
+_scratch_mkfs >> $seqres.full
+_scratch_mount >> $seqres.full
+
+dbfile=$SCRATCH_MNT/dbfile
+foo=$SCRATCH_MNT/foo
+bar=$SCRATCH_MNT/bar
+
+$XFS_IO_PROG -c "pwrite 0 512k -S 0xff" -c "fsync" -f $dbfile >> $seqres.full
+$XFS_IO_PROG -c "pwrite 0 2m" -c "fsync" -f $foo >> $seqres.full
+sync
+
+# start atomic_write on dbfile & write data to dbfile
+$F2FS_IO_PROG write 1 0 32 zero atomic_commit $dbfile 3000 >> $seqres.full &
+$XFS_IO_PROG -c "fpunch 0 2m" $foo >> $seqres.full
+$XFS_IO_PROG -c "pwrite 0 2m" -c "fsync" -f $bar >> $seqres.full
+
+# persist all dirty data
+sync
+echo 3 > /proc/sys/vm/drop_caches
+
+# trigger foreground GC to migrate data block of atomic_file
+$F2FS_IO_PROG gc 1 $SCRATCH_MNT > /dev/null 2>&1
+
+# wait for atomic_write commit completion
+sleep 5
+# print in-memory data
+od -x $dbfile
+echo 3 > /proc/sys/vm/drop_caches
+# print on-disk data
+od -x $dbfile
+
+_scratch_unmount
+
+status=0
+exit
diff --git a/tests/f2fs/003.out b/tests/f2fs/003.out
new file mode 100644
index 00000000..d6c8a637
--- /dev/null
+++ b/tests/f2fs/003.out
@@ -0,0 +1,11 @@
+QA output created by 003
+0000000 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0400000 ffff ffff ffff ffff ffff ffff ffff ffff
+*
+2000000
+0000000 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0400000 ffff ffff ffff ffff ffff ffff ffff ffff
+*
+2000000
-- 
2.40.1