[PATCH v2] xfs: add a test for number of open zones on conventional devices

[Christoph Hellwig <hch@lst.de>]

Test that mounts of zoned file systems on conventional devices don't
create more open zones than allowed when the last blocks in one or more
zones have been invalidated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---

 - delete odd files
 - fix the sysfs attr check to be on the scratch and not the test fs

 tests/xfs/4201     | 66 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/4201.out |  1 +
 2 files changed, 67 insertions(+)
 create mode 100755 tests/xfs/4201
 create mode 100644 tests/xfs/4201.out

diff --git a/tests/xfs/4201 b/tests/xfs/4201
new file mode 100755
index 000000000000..150978a9deda
--- /dev/null
+++ b/tests/xfs/4201
@@ -0,0 +1,66 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Christoph Hellwig.
+#
+# FS QA Test No. 4201
+#
+# Test that mounts of zoned file systems on conventional devices don't create
+# more open zones than allowed when the last blocks in one or more zones have
+# been invalidated.
+#
+
+. ./common/preamble
+_begin_fstest auto quick zone
+
+_require_scratch
+_require_odirect
+_require_non_zoned_device $SCRATCH_DEV
+_require_non_zoned_device $SCRATCH_RTDEV
+
+open_zones=5
+blocks=65536
+bsize=4096
+
+zone_size_mib=$((blocks * bsize / 1024 / 1024))
+file_size_mib=$((zone_size_mib / 2))
+nr_files=$((open_zones * 3 - 1))
+
+echo "zone size: $zone_size_mib" >>$seqres.full
+echo "file size: $file_size_mib" >>$seqres.full
+echo "nr files: $nr_files" >>$seqres.full
+
+_scratch_mkfs -b size=${bsize} -r zoned=1,rgsize=${blocks}b \
+	> "$seqres.full" 2>&1
+_scratch_mount -o max_open_zones=${open_zones}
+
+_has_fs_sysfs_attr $SCRATCH_DEV zoned/nr_open_zones || \
+	_notrun "This test requires /sys/fs/${FSTYP}/$SCRATCH_DEV/zoned/nr_open_zones"
+
+for i in $(seq 1 $nr_files); do
+	dd if=/dev/zero of=$SCRATCH_MNT/$i bs=1M count=$file_size_mib \
+		 oflag=direct > /dev/null 2>&1
+done
+
+# delete odd numbered files as they should be at the end of the zones
+for ((i = 0; i < $nr_files; i = $((i + 2)))); do
+	rm $SCRATCH_MNT/$((i + 1))
+done
+
+_scratch_unmount
+_scratch_mount -o max_open_zones=${open_zones}
+
+max_open=$(_get_fs_sysfs_attr $SCRATCH_DEV zoned/max_open_zones)
+nr_open=$(_get_fs_sysfs_attr $SCRATCH_DEV zoned/nr_open_zones)
+
+if [ ${max_open} -ne $((open_zones - 1)) ]; then
+	_fail "Test needs adjustments for multiple open GC zones"
+fi
+
+if [ ${nr_open} -gt ${max_open} ]; then
+	_fail "Too many open zones: $nr_open/$max_open"
+fi
+
+_scratch_unmount
+
+status=0
+exit
diff --git a/tests/xfs/4201.out b/tests/xfs/4201.out
new file mode 100644
index 000000000000..32e395dd4d6d
--- /dev/null
+++ b/tests/xfs/4201.out
@@ -0,0 +1 @@
+QA output created by 4201
-- 
2.47.3