linux-kernel - [PATCH blktests 2/3] dm/003: add unmap write zeroes tests

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Message-ID: <20250318072835.3508696-3-yi.zhang@huaweicloud.com>
Date: Tue, 18 Mar 2025 15:28:34 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-nvme@...ts.infradead.org,
	linux-scsi@...r.kernel.org
Cc: linux-xfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	hch@....de,
	tytso@....edu,
	djwong@...nel.org,
	john.g.garry@...cle.com,
	bmarzins@...hat.com,
	chaitanyak@...dia.com,
	shinichiro.kawasaki@....com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH blktests 2/3] dm/003: add unmap write zeroes tests

From: Zhang Yi <yi.zhang@...wei.com>

Test block device unmap write zeroes sysfs interface with device-mapper
stacked devices. The /sys/block/<disk>/queue/write_zeroes_unmap
interface should return 1 if the underlying devices support the unmap
write zeroes command, and it should return 0 otherwise.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 common/rc        | 16 ++++++++++++++
 tests/dm/003     | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 tests/dm/003.out |  2 ++
 3 files changed, 75 insertions(+)
 create mode 100755 tests/dm/003
 create mode 100644 tests/dm/003.out

diff --git a/common/rc b/common/rc
index bc6c2e4..60c21f2 100644
--- a/common/rc
+++ b/common/rc
@@ -615,3 +615,19 @@ _io_uring_restore()
 		echo "$IO_URING_DISABLED" > /proc/sys/kernel/io_uring_disabled
 	fi
 }
+
+# get real device path name by following link
+_real_dev()
+{
+	local dev=$1
+	if [ -b "$dev" ] && [ -L "$dev" ]; then
+		dev=`readlink -f "$dev"`
+	fi
+	echo $dev
+}
+
+# basename of a device
+_short_dev()
+{
+	echo `basename $(_real_dev $1)`
+}
diff --git a/tests/dm/003 b/tests/dm/003
new file mode 100755
index 0000000..1013eb5
--- /dev/null
+++ b/tests/dm/003
@@ -0,0 +1,57 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Huawei.
+#
+# Test block device unmap write zeroes sysfs interface with device-mapper
+# stacked devices.
+
+. tests/dm/rc
+. common/scsi_debug
+
+DESCRIPTION="test unmap write zeroes sysfs interface with dm devices"
+QUICK=1
+
+requires() {
+	_have_scsi_debug
+}
+
+device_requries() {
+	_require_test_dev_sysfs queue/write_zeroes_unmap
+}
+
+setup_test_device() {
+	if ! _configure_scsi_debug "$@"; then
+		return 1
+	fi
+
+	local dev="/dev/${SCSI_DEBUG_DEVICES[0]}"
+	local blk_sz="$(blockdev --getsz "$dev")"
+	dmsetup create test --table "0 $blk_sz linear $dev 0"
+}
+
+cleanup_test_device() {
+	dmsetup remove test
+	_exit_scsi_debug
+}
+
+test() {
+	echo "Running ${TEST_NAME}"
+
+	# disable WRITE SAME with unmap
+	setup_test_device lbprz=0
+	umap="$(cat "/sys/block/$(_short_dev /dev/mapper/test)/queue/write_zeroes_unmap")"
+	if [[ $umap -ne 0 ]]; then
+		echo "Test disable WRITE SAME with unmap failed."
+	fi
+	cleanup_test_device
+
+	# enable WRITE SAME with unmap
+	setup_test_device lbprz=1 lbpws=1
+	umap="$(cat "/sys/block/$(_short_dev /dev/mapper/test)/queue/write_zeroes_unmap")"
+	if [[ $umap -ne 1 ]]; then
+		echo "Test enable WRITE SAME with unmap failed."
+	fi
+	cleanup_test_device
+
+	echo "Test complete"
+}
diff --git a/tests/dm/003.out b/tests/dm/003.out
new file mode 100644
index 0000000..51a5405
--- /dev/null
+++ b/tests/dm/003.out
@@ -0,0 +1,2 @@
+Running dm/003
+Test complete
-- 
2.46.1