From 7afb07edeb491a68c0447a8c348e7fc26edc24fa Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 8 May 2025 07:34:39 +0200
Subject: [PATCH] xfs: test zone stream separation for two buffered writers

Check that two parallel buffered sequential writers are separated into
different zones when writeback happens before closing the files.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
---
 tests/xfs/641     | 65 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/641.out |  3 +++
 2 files changed, 68 insertions(+)
 create mode 100755 tests/xfs/641
 create mode 100644 tests/xfs/641.out

diff --git a/tests/xfs/641 b/tests/xfs/641
new file mode 100755
index 00000000..f39dc3d7
--- /dev/null
+++ b/tests/xfs/641
@@ -0,0 +1,65 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Christoph Hellwig.
+#
+# FS QA Test No. 641
+#
+# Test that multiple buffered I/O write streams are directed to separate zones
+# when written back with the file still open.
+#
+. ./common/preamble
+_begin_fstest quick auto rw zone
+
+. ./common/xfs
+
+_require_scratch
+_require_odirect
+_require_aio
+
+_scratch_mkfs_xfs >>$seqres.full 2>&1
+_scratch_mount
+_require_xfs_scratch_zoned 3
+
+fio_config=$tmp.fio
+fio_out=$tmp.fio.out
+fio_err=$tmp.fio.err
+
+cat >$fio_config <<EOF
+[global]
+bs=64k
+iodepth=16
+iodepth_batch=8
+size=1m
+directory=$SCRATCH_MNT
+rw=write
+fsync_on_close=1
+
+[file1]
+filename=file1
+size=128m
+
+[file2]
+filename=file2
+size=128m
+EOF
+
+_require_fio $fio_config
+
+$FIO_PROG $fio_config --output=$fio_out
+cat $fio_out >> $seqres.full
+
+# Check the files only have a single extent each and are in separate zones
+extents1=$(_count_extents $SCRATCH_MNT/file1)
+extents2=$(_count_extents $SCRATCH_MNT/file2)
+
+echo "number of file 1 extents: $extents1"
+echo "number of file 2 extents: $extents2"
+
+rg1=`xfs_bmap -v $SCRATCH_MNT/file1 | _filter_bmap_gno`
+rg2=`xfs_bmap -v $SCRATCH_MNT/file2 | _filter_bmap_gno`
+if [ "${rg1}" == "${rg2}" ]; then
+	echo "same RG used for both files"
+fi
+
+status=0
+exit
diff --git a/tests/xfs/641.out b/tests/xfs/641.out
new file mode 100644
index 00000000..4deaaabb
--- /dev/null
+++ b/tests/xfs/641.out
@@ -0,0 +1,3 @@
+QA output created by 641
+number of file 1 extents: 1
+number of file 2 extents: 1
-- 
2.47.3