[PATCH blktests v3 2/2] zbd/007: Add zone mapping test for logical devices

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

Add the test case to check zones sector mapping of logical devices
This test case requires that such a logical device be specified in
TEST_DEVS in config. The test is skipped for devices that are identified
as not logically created. This test case catches regressions of complex
zone remapping problem fixed by commit 9864cd5dc54c "dm: fix report zone
remapping to account for partition offset".

To test that the zone mapping is correct, select a few sequential write
required zones of the logical device and move the write pointers of
these zones through the container device of the logical device, using
the physical sector mapping of the zones. The write pointers position of
the selected zones is then checked through a zone report of the logical
device using the logical sector mapping of the zones. The test reports a
success if the position of the zone write pointers relative to the zone
start sector must be identical for both the logical and physical
locations of the zones.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 tests/zbd/007     | 110 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/zbd/007.out |   2 +
 2 files changed, 112 insertions(+)
 create mode 100755 tests/zbd/007
 create mode 100644 tests/zbd/007.out

diff --git a/tests/zbd/007 b/tests/zbd/007
new file mode 100755
index 0000000..b4dcbd8
--- /dev/null
+++ b/tests/zbd/007
@@ -0,0 +1,110 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2019 Western Digital Corporation or its affiliates.
+#
+# Test zones are mapped correctly between a logical device and its container
+# device. Move write pointers of sequential write required zones on the
+# container devices, and confirm same write pointer positions of zones on the
+# logical devices.
+
+. tests/zbd/rc
+
+DESCRIPTION="zone mapping between logical and container devices"
+CAN_BE_ZONED=1
+QUICK=1
+
+requires() {
+	_have_program dmsetup
+}
+
+device_requires() {
+	_test_dev_is_logical
+}
+
+# Select test target zones. Pick up the first sequential required zones. If
+# available, add one or two more sequential required zones. One is at the last
+# end of TEST_DEV. The other is in middle between the first and the last zones.
+select_zones() {
+	local -i zone_idx
+	local -a zones
+
+	zone_idx=$(_find_first_sequential_zone) || return $?
+	zones=( "${zone_idx}" )
+	if zone_idx=$(_find_last_sequential_zone); then
+		zones+=( "${zone_idx}" )
+		if zone_idx=$(_find_sequential_zone_in_middle \
+				      "${zones[0]}" "${zones[1]}"); then
+			zones+=( "${zone_idx}" )
+		fi
+	fi
+	echo "${zones[@]}"
+}
+
+test_device() {
+	local -i bs
+	local -a test_z # test target zones
+	local -a test_z_start
+
+	echo "Running ${TEST_NAME}"
+
+	# Get physical block size to meet zoned block device I/O requirement
+	_get_sysfs_variable "${TEST_DEV}" || return $?
+	bs=${SYSFS_VARS[SV_PHYS_BLK_SIZE]}
+	_put_sysfs_variable
+
+	# Get test target zones
+	_get_blkzone_report "${TEST_DEV}" || return $?
+	read -r -a test_z < <(select_zones)
+	for ((i = 0; i < ${#test_z[@]}; i++)); do
+		test_z_start+=("${ZONE_STARTS[test_z[i]]}")
+	done
+	echo "${test_z[*]}" >> "$FULL"
+	echo "${test_z_start[*]}" >> "$FULL"
+	_put_blkzone_report
+	if ((!${#test_z[@]})); then
+		echo "Test target zones not available on ${TEST_DEV}"
+		return 1
+	fi
+
+	# Reset and move write pointers of the container device
+	for ((i=0; i < ${#test_z[@]}; i++)); do
+		local -a arr
+
+		read -r -a arr < <(_get_dev_container_and_sector \
+					   "${test_z_start[i]}")
+		container_dev="${arr[0]}"
+		container_start="${arr[1]}"
+
+		echo "${container_dev}" "${container_start}" >> "$FULL"
+
+		if ! blkzone reset -o "${container_start}" -c 1 \
+		     "${container_dev}"; then
+			echo "Reset zone failed"
+			return 1
+		fi
+
+		if ! dd if=/dev/zero of="${container_dev}" bs="${bs}" \
+		     count=$((4096 * (i + 1) / bs)) oflag=direct \
+		     seek=$((container_start * 512 / bs)) \
+		     >> "$FULL" 2>&1 ; then
+			echo "dd failed"
+		fi
+
+		# Wait for partition table re-read event settles
+		udevadm settle
+	done
+
+	# Check write pointer positions on the logical device
+	_get_blkzone_report "${TEST_DEV}" || return $?
+	for ((i=0; i < ${#test_z[@]}; i++)); do
+		if ((ZONE_WPTRS[test_z[i]] != 8 * (i + 1))); then
+			echo "Unexpected write pointer position"
+			echo -n "zone=${i}, wp=${ZONE_WPTRS[i]}, "
+			echo "dev=${TEST_DEV}"
+		fi
+		echo "${ZONE_WPTRS[${test_z[i]}]}" >> "$FULL"
+	done
+	_put_blkzone_report
+
+	echo "Test complete"
+}
diff --git a/tests/zbd/007.out b/tests/zbd/007.out
new file mode 100644
index 0000000..28a1395
--- /dev/null
+++ b/tests/zbd/007.out
@@ -0,0 +1,2 @@
+Running zbd/007
+Test complete
-- 
2.21.0