md/003: add NVMe atomic write tests for stacked devices

md/002 only tests SCSI via scsi_debug.

It is also useful to test NVMe, so add a specific test for that.

The results for 002 and 003 should be the same, so link them.

_md_atomics_test requires 4x devices with atomics support, so check for
that.

Signed-off-by: John Garry <[email protected]>
[Shin'ichiro: simplified using TEST_DEV_ARRAY]
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: johnpgarry

tests/md/002

@@ -25,7 +25,7 @@ test() {
 		per_host_store=true
 	)
 
-	echo "Running ${TEST_NAME}"
+	echo "Running md_atomics_test"
 
 	if ! _configure_scsi_debug "${scsi_debug_params[@]}"; then
 		return 1

tests/md/002.out

@@ -1,4 +1,4 @@
-Running md/002
+Running md_atomics_test
 TEST 1 raid0 step 1 - Verify md sysfs atomic attributes matches - pass
 TEST 2 raid0 step 1 - Verify sysfs atomic attributes - pass
 TEST 3 raid0 step 1 - Verify md sysfs_atomic_write_max is equal to expected_atomic_write_max - pass

tests/md/003

@@ -0,0 +1,35 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Oracle and/or its affiliates
+#
+# Test NMVe Atomic Writes with MD devices
+
+. tests/md/rc
+. common/nvme
+. common/xfs
+
+DESCRIPTION="test md atomic writes for NVMe drives"
+QUICK=1
+
+requires() {
+	_nvme_requires
+	_stacked_atomic_test_requires
+}
+
+device_requires() {
+	_require_test_dev_is_nvme
+}
+
+test_device_array() {
+	echo "Running md_atomics_test"
+
+	if [[ ${#TEST_DEV_ARRAY[@]} -lt 4 ]]; then
+		SKIP_REASONS+=("requires at least 4 NVMe devices")
+		return 1
+	fi
+
+	_md_atomics_test "${TEST_DEV_ARRAY[0]##*/}" "${TEST_DEV_ARRAY[1]##*/}" \
+			 "${TEST_DEV_ARRAY[2]##*/}" "${TEST_DEV_ARRAY[3]##*/}"
+
+	echo "Test complete"
+}

tests/md/003.out

@@ -0,0 +1 @@
+002.out