From: Zhang Yi <yi.zh...@huawei.com>
Test block device unmap write zeroes sysfs interface with device-mapper
stacked devices. The sysfs parameters should inherit from the underlying
SCSI device. We can disable write zeroes support by setting
/sys/block/dm-<X>/queue/write_zeroes_unmap_max_bytes to zero.
Signed-off-by: Zhang Yi <yi.zh...@huawei.com>
---
common/rc | 10 ++++++
tests/dm/003 | 86 ++++++++++++++++++++++++++++++++++++++++++++++++
tests/dm/003.out | 2 ++
3 files changed, 98 insertions(+)
create mode 100755 tests/dm/003
create mode 100644 tests/dm/003.out
diff --git a/common/rc b/common/rc
index dfc389f..bb96a88 100644
--- a/common/rc
+++ b/common/rc
@@ -668,3 +668,13 @@ _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 $dev
+}
diff --git a/tests/dm/003 b/tests/dm/003
new file mode 100755
index 0000000..0b6bce2
--- /dev/null
+++ b/tests/dm/003
@@ -0,0 +1,86 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Huawei.
+#
+# Test block device unmap write zeroes sysfs interface with device-mapper
+# stacked devices.
+
+. tests/dm/rc
+. common/scsi_debug
+
+DESCRIPTION="test unmap write zeroes sysfs interface with dm devices"
+QUICK=1
+
+requires() {
+ _have_scsi_debug
+}
+
+readonly TO_SKIP=255
+
+setup_test_device() {
+ local dev blk_sz dpath
+
+ if ! _configure_scsi_debug "$@"; then
+ return 1
+ fi
+
+ if [[ ! -f
/sys/block/${SCSI_DEBUG_DEVICES[0]}/queue/write_zeroes_unmap_max_hw_bytes ]];
then
+ _exit_scsi_debug
+ return $TO_SKIP
+ fi
+
+ dev="/dev/${SCSI_DEBUG_DEVICES[0]}"
+ blk_sz="$(blockdev --getsz "$dev")"
+ dmsetup create test --table "0 $blk_sz linear $dev 0"
+
+ dpath=$(_real_dev /dev/mapper/test)
+ echo "${dpath##*/}"
+}
+
+cleanup_test_device() {
+ dmsetup remove test
+ _exit_scsi_debug
+}
+
+test() {
+ echo "Running ${TEST_NAME}"
+
+ # disable WRITE SAME with unmap
+ local dname
+ dname=$(setup_test_device lbprz=0)
+ ret=$?
+ if ((ret)); then
+ if ((ret == TO_SKIP)); then
+ SKIP_REASONS+=("kernel does not support unmap write
zeroes sysfs interface")
+ fi
+ return 1
+ fi
+
+ umap_hw_bytes="$(cat
"/sys/block/$dname/queue/write_zeroes_unmap_max_hw_bytes")"
+ umap_bytes="$(cat
"/sys/block/$dname/queue/write_zeroes_unmap_max_bytes")"
+ if [[ $umap_hw_bytes -ne 0 || $umap_bytes -ne 0 ]]; then
+ echo "Test disable WRITE SAME with unmap failed."
+ fi
+ cleanup_test_device
+
+ # enable WRITE SAME with unmap
+ if ! dname=$(setup_test_device lbprz=1 lbpws=1); then
+ return 1
+ fi
+
+ zero_bytes="$(cat "/sys/block/$dname/queue/write_zeroes_max_bytes")"
+ umap_hw_bytes="$(cat
"/sys/block/$dname/queue/write_zeroes_unmap_max_hw_bytes")"
+ umap_bytes="$(cat
"/sys/block/$dname/queue/write_zeroes_unmap_max_bytes")"
+ if [[ $umap_hw_bytes -ne $zero_bytes || $umap_bytes -ne $zero_bytes ]];
then
+ echo "Test enable WRITE SAME with unmap failed."
+ fi
+
+ echo 0 > "/sys/block/$dname/queue/write_zeroes_unmap_max_bytes"
+ umap_bytes="$(cat
"/sys/block/$dname/queue/write_zeroes_unmap_max_bytes")"
+ if [[ $umap_bytes -ne 0 ]]; then
+ echo "Test manually disable 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
--
2.39.2
