[PATCH v3 blktests 0/2] Add atomic write tests for scsi and nvme

[PATCH v3 blktests 0/2] Add atomic write tests for scsi and nvme

[Alan Adamson]

Changes in v3:
- Remove _have_xfs_io routine and use _have_program.
- Comment cleanup in 0001
- Add SKIP_REASONS when xfs_io -A option is absent.
- Keep lines <=80 characters.
- Move device_requires logic in 0001 and 0002 to common/rc.

Changes in v2:
- Add additional comments in common/xfs
- Remove xfs_io and kernel version checking
- Simplify paths for sysfs attributes
- Fix failed case output (missing echo) in scsi/009
- Add local variable that sets Test # and description (test_desc) for scsi/009 and nvme/059
- Only use scsi_debug device if no scsi test device is provided.
- nvme testing done with qemu-nvme.
- scsi testing done with scsi_debug and qemu-scsi (no atomic write support).  No testing on
  atomic write capable scsi devices was done.
-------------------------------------------------------------------------------------------
Add tests for atomic write support.

Tests will be delivered for scsi (using scsi_debug) and nvme.  NVMe can use the qemu-nvme
emulated device that supports Controller-based Atomic Parameters (QEMU 9.2).

The xfs_io utility delivered with the xfsprogs-devel package (version 6.12) is required by
these tests.

The Linux Kernel 6.11 (and greater) supports Atomic Writes and is required by these tests.


Alan Adamson (2):
  scsi/009: add atomic write tests
  nvme/059: add atomic write tests

 common/rc          |   8 ++
 common/xfs         |  58 ++++++++++++
 tests/nvme/059     | 147 +++++++++++++++++++++++++++++
 tests/nvme/059.out |  10 ++
 tests/scsi/009     | 229 +++++++++++++++++++++++++++++++++++++++++++++
 tests/scsi/009.out |  18 ++++
 6 files changed, 470 insertions(+)
 create mode 100755 tests/nvme/059
 create mode 100644 tests/nvme/059.out
 create mode 100755 tests/scsi/009
 create mode 100644 tests/scsi/009.out

-- 
2.43.5

[PATCH v3 blktests 1/2] scsi/009: add atomic write tests

[Alan Adamson]

Tests basic atomic write functionality. If no scsi test device is provided,
a scsi_debug device will be used. Testing areas include:

- Verify sysfs atomic write attributes are consistent with
  atomic write attributes advertised by scsi_debug.
- Verify the atomic write paramters of statx are correct using
  xfs_io.
- Perform a pwritev2() (with and without RWF_ATOMIC flag) using
  xfs_io:
    - maximum byte size (atomic_write_unit_max_bytes)
    - minimum byte size (atomic_write_unit_min_bytes)
    - a write larger than atomic_write_unit_max_bytes
    - a write smaller than atomic_write_unit_min_bytes

Signed-off-by: Alan Adamson <alan.adamson@oracle.com>
---
 common/rc          |   8 ++
 common/xfs         |  58 ++++++++++++
 tests/scsi/009     | 229 +++++++++++++++++++++++++++++++++++++++++++++
 tests/scsi/009.out |  18 ++++
 4 files changed, 313 insertions(+)
 create mode 100755 tests/scsi/009
 create mode 100644 tests/scsi/009.out

diff --git a/common/rc b/common/rc
index bcb215d35114..06c0a416e3e1 100644
--- a/common/rc
+++ b/common/rc
@@ -292,6 +292,14 @@ _require_test_dev_can_discard() {
 	return 0
 }
 
+_require_device_support_atomic_writes() {
+	_require_test_dev_sysfs queue/atomic_write_max_bytes
+	if (( $(< "${TEST_DEV_SYSFS}"/queue/atomic_write_max_bytes) == 0 )); then
+		SKIP_REASONS+=("${TEST_DEV} does not support atomic write")
+		return 1
+	fi
+}
+
 _test_dev_queue_get() {
 	if [[ $1 = scheduler ]]; then
 		sed -e 's/.*\[//' -e 's/\].*//' "${TEST_DEV_SYSFS}/queue/scheduler"
diff --git a/common/xfs b/common/xfs
index 569770fecd53..0b1ca7c29049 100644
--- a/common/xfs
+++ b/common/xfs
@@ -6,6 +6,22 @@
 
 . common/shellcheck
 
+_have_xfs_io_atomic_write() {
+	local s
+
+	_have_program xfs_io || return $?
+
+	# If the pwrite command supports the -A option then this version
+	# of xfs_io supports atomic writes.
+	s=$(xfs_io -c help | grep pwrite | awk '{ print $4}')
+	if [[ $s == *"A"* ]];
+	then
+		return 0
+	fi
+	SKIP_REASONS+=("xfs_io does not support the -A option")
+	return 1
+}
+
 _have_xfs() {
 	_have_fs xfs && _have_program mkfs.xfs
 }
@@ -52,3 +68,45 @@ _xfs_run_fio_verify_io() {
 
 	return "${rc}"
 }
+
+# Use xfs_io to perform a non-atomic write using pwritev2().
+# Args:    $1 - device to write to
+#          $2 - number of bytes to write
+# Returns: Number of bytes written
+run_xfs_io_pwritev2() {
+	local dev=$1
+	local bytes_to_write=$2
+	local bytes_written
+
+	# Perform write and extract out bytes written from xfs_io output
+	bytes_written=$(xfs_io -d -C \
+		"pwrite -b ${bytes_to_write} -V 1 -D 0 ${bytes_to_write}" \
+		"$dev" | grep "wrote" | sed 's/\// /g' | awk '{ print $2 }')
+	echo "$bytes_written"
+}
+
+# Use xfs_io to perform an atomic write using pwritev2().
+# Args:    $1 - device to write to
+#          $2 - number of bytes to write
+# Returns: Number of bytes written
+run_xfs_io_pwritev2_atomic() {
+	local dev=$1
+	local bytes_to_write=$2
+	local bytes_written
+
+	# Perform atomic write and extract out bytes written from xfs_io output
+	bytes_written=$(xfs_io -d -C \
+		"pwrite -b ${bytes_to_write} -V 1 -A -D 0 ${bytes_to_write}" \
+		"$dev" | grep "wrote" | sed 's/\// /g' | awk '{ print $2 }')
+	echo "$bytes_written"
+}
+
+run_xfs_io_xstat() {
+	local dev=$1
+	local field=$2
+	local statx_output
+
+	statx_output=$(xfs_io -c "statx -r -m 0x00010000" "$dev" | \
+		grep "$field" | awk '{ print $3 }')
+	echo "$statx_output"
+}
diff --git a/tests/scsi/009 b/tests/scsi/009
new file mode 100755
index 000000000000..b114d92dd3db
--- /dev/null
+++ b/tests/scsi/009
@@ -0,0 +1,229 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Oracle and/or its affiliates
+#
+# Test SCSI Atomic Writes with scsi_debug
+
+. tests/scsi/rc
+. common/scsi_debug
+. common/xfs
+
+DESCRIPTION="test scsi atomic writes"
+QUICK=1
+
+requires() {
+	_have_driver scsi_debug
+	_have_xfs_io_atomic_write
+}
+
+device_requires() {
+	_require_device_support_atomic_writes
+}
+
+fallback_device() {
+	local scsi_debug_params=(
+		delay=0
+		atomic_wr=1
+	)
+	if ! _configure_scsi_debug "${scsi_debug_params[@]}"; then
+		return 1
+		fi
+	echo "/dev/${SCSI_DEBUG_DEVICES[0]}"
+}
+
+cleanup_fallback_device() {
+	_exit_scsi_debug
+}
+
+test_device() {
+	local scsi_debug_atomic_wr_max_length
+	local scsi_debug_atomic_wr_gran
+	local scsi_atomic_max_bytes
+	local scsi_atomic_min_bytes
+	local sysfs_max_hw_sectors_kb
+	local max_hw_bytes
+	local sysfs_logical_block_size
+	local sysfs_atomic_max_bytes
+	local sysfs_atomic_unit_max_bytes
+	local sysfs_atomic_unit_min_bytes
+	local statx_atomic_min
+	local statx_atomic_max
+	local bytes_to_write
+	local bytes_written
+	local test_desc
+
+	echo "Running ${TEST_NAME}"
+
+	sysfs_logical_block_size=$(< "${TEST_DEV_SYSFS}"/queue/logical_block_size)
+	sysfs_max_hw_sectors_kb=$(< "${TEST_DEV_SYSFS}"/queue/max_hw_sectors_kb)
+	max_hw_bytes=$(( "$sysfs_max_hw_sectors_kb" * 1024 ))
+	sysfs_atomic_max_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_max_bytes)
+	sysfs_atomic_unit_max_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_unit_max_bytes)
+	sysfs_atomic_unit_min_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_unit_min_bytes)
+	scsi_debug_atomic_wr_max_length=$(< /sys/module/scsi_debug/parameters/atomic_wr_max_length)
+	scsi_debug_atomic_wr_gran=$(< /sys/module/scsi_debug/parameters/atomic_wr_gran)
+	scsi_atomic_max_bytes=$(( "$scsi_debug_atomic_wr_max_length" * "$sysfs_logical_block_size" ))
+	scsi_atomic_min_bytes=$(( "$scsi_debug_atomic_wr_gran" * "$sysfs_logical_block_size" ))
+
+	test_desc="TEST 1 - Verify sysfs atomic attributes"
+	if [ "$max_hw_bytes" -ge "$sysfs_atomic_max_bytes" ] &&
+		[ "$sysfs_atomic_max_bytes" -ge "$sysfs_atomic_unit_max_bytes" ] &&
+		[ "$sysfs_atomic_unit_max_bytes" -ge "$sysfs_atomic_unit_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $max_hw_bytes - $sysfs_max_hw_sectors_kb -" \
+			"$sysfs_atomic_max_bytes - $sysfs_atomic_unit_max_bytes -" \
+			"$sysfs_atomic_unit_min_bytes"
+	fi
+
+	test_desc="TEST 2 - check scsi_debug atomic_wr_max_length is the same as sysfs atomic_write_max_bytes"
+	if [ "$scsi_atomic_max_bytes" -le "$max_hw_bytes" ]
+	then
+		if [ "$scsi_atomic_max_bytes" = "$sysfs_atomic_max_bytes" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $scsi_atomic_max_bytes - $max_hw_bytes -" \
+				"$sysfs_atomic_max_bytes"
+		fi
+	else
+		if [ "$sysfs_atomic_max_bytes" = "$max_hw_bytes" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $scsi_atomic_max_bytes - $max_hw_bytes -" \
+				"$sysfs_atomic_max_bytes"
+		fi
+	fi
+
+	test_desc="TEST 3 - check sysfs atomic_write_unit_max_bytes <= scsi_debug atomic_wr_max_length"
+	if (("$sysfs_atomic_unit_max_bytes" <= "$scsi_atomic_max_bytes"))
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $sysfs_atomic_unit_max_bytes - $scsi_atomic_max_bytes"
+	fi
+
+	test_desc="TEST 4 - check sysfs atomic_write_unit_min_bytes = scsi_debug atomic_wr_gran"
+	if [ "$sysfs_atomic_unit_min_bytes" = "$scsi_atomic_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $sysfs_atomic_unit_min_bytes - $scsi_atomic_min_bytes"
+	fi
+
+	test_desc="TEST 5 - check statx stx_atomic_write_unit_min"
+	statx_atomic_min=$(run_xfs_io_xstat "$TEST_DEV" "stat.atomic_write_unit_min")
+	if [ "$statx_atomic_min" = "$scsi_atomic_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $statx_atomic_min - $scsi_atomic_min_bytes"
+	fi
+
+	test_desc="TEST 6 - check statx stx_atomic_write_unit_max"
+	statx_atomic_max=$(run_xfs_io_xstat "$TEST_DEV" "stat.atomic_write_unit_max")
+	if [ "$statx_atomic_max" = "$sysfs_atomic_unit_max_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $statx_atomic_max - $sysfs_atomic_unit_max_bytes"
+	fi
+
+	test_desc="TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes "
+	test_desc+="with no RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$sysfs_atomic_unit_max_bytes")
+	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
+	fi
+
+	test_desc="TEST 8 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with "
+	test_desc+="RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$sysfs_atomic_unit_max_bytes")
+	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
+	fi
+
+	test_desc="TEST 9 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 "
+	test_desc+="bytes with no RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_to_write=$(( "${sysfs_atomic_unit_max_bytes}" + "$sysfs_logical_block_size" ))
+	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$bytes_to_write")
+	if [ "$bytes_written" = "$bytes_to_write" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $bytes_to_write"
+	fi
+
+	test_desc="TEST 10 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 "
+	test_desc+="bytes with RWF_ATOMIC flag - pwritev2 should not be succesful"
+	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$bytes_to_write")
+	if [ "$bytes_written" = "" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $bytes_to_write"
+	fi
+
+	test_desc="TEST 11 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes "
+	test_desc+="with no RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$sysfs_atomic_unit_min_bytes")
+	if [ "$bytes_written" = "$sysfs_atomic_unit_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $scsi_atomic_min_bytes"
+	fi
+
+	test_desc="TEST 12 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes "
+	test_desc+="with RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$sysfs_atomic_unit_min_bytes")
+	if [ "$bytes_written" = "$sysfs_atomic_unit_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $scsi_atomic_min_bytes"
+	fi
+
+	test_desc="TEST 13 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 "
+	test_desc+="bytes with no RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_to_write=$(( "${sysfs_atomic_unit_min_bytes}" - "${sysfs_logical_block_size}" ))
+	if [ "$bytes_to_write" = 0 ]
+	then
+		echo "$test_desc - pass"
+		echo "pwrite: Invalid argument"
+	else
+		bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$bytes_to_write")
+		if [ "$bytes_written" = "$bytes_to_write" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $bytes_written - $bytes_to_write"
+		fi
+	fi
+	test_desc="TEST 14 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 "
+	test_desc+="bytes with RWF_ATOMIC flag - pwritev2 should fail"
+	if [ "$bytes_to_write" = 0 ]
+	then
+		echo "$test_desc - pass"
+	else
+		bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$bytes_to_write")
+		if [ "$bytes_written" = "" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $bytes_written - $bytes_to_write"
+		fi
+	fi
+
+	_exit_scsi_debug
+
+	echo "Test complete"
+}
diff --git a/tests/scsi/009.out b/tests/scsi/009.out
new file mode 100644
index 000000000000..e31416b93515
--- /dev/null
+++ b/tests/scsi/009.out
@@ -0,0 +1,18 @@
+Running scsi/009
+TEST 1 - Verify sysfs atomic attributes - pass
+TEST 2 - check scsi_debug atomic_wr_max_length is the same as sysfs atomic_write_max_bytes - pass
+TEST 3 - check sysfs atomic_write_unit_max_bytes <= scsi_debug atomic_wr_max_length - pass
+TEST 4 - check sysfs atomic_write_unit_min_bytes = scsi_debug atomic_wr_gran - pass
+TEST 5 - check statx stx_atomic_write_unit_min - pass
+TEST 6 - check statx stx_atomic_write_unit_max - pass
+TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
+TEST 8 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with RWF_ATOMIC flag - pwritev2 should be succesful - pass
+TEST 9 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
+pwrite: Invalid argument
+TEST 10 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 bytes with RWF_ATOMIC flag - pwritev2 should not be succesful - pass
+TEST 11 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
+TEST 12 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes with RWF_ATOMIC flag - pwritev2 should be succesful - pass
+TEST 13 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
+pwrite: Invalid argument
+TEST 14 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 bytes with RWF_ATOMIC flag - pwritev2 should fail - pass
+Test complete
-- 
2.43.5

[PATCH v3 blktests 2/2] nvme/059: add atomic write tests

[Alan Adamson]

Tests basic atomic write functionality using NVMe devices
that support the AWUN and AWUPF Controller Atomic Parameters
and NAWUN and NAWUPF Namespace Atomic Parameters.

Testing areas include:

- Verify sysfs atomic write attributes are consistent with
  atomic write capablities advertised by the NVMe HW.

- Verify the atomic write paramters of statx are correct using
  xfs_io.

- Perform a pwritev2() (with and without RWF_ATOMIC flag) using
  xfs_io:
    - maximum byte size (atomic_write_unit_max_bytes)
    - a write larger than atomic_write_unit_max_bytes

Signed-off-by: Alan Adamson <alan.adamson@oracle.com>
---
 tests/nvme/059     | 147 +++++++++++++++++++++++++++++++++++++++++++++
 tests/nvme/059.out |  10 +++
 2 files changed, 157 insertions(+)
 create mode 100755 tests/nvme/059
 create mode 100644 tests/nvme/059.out

diff --git a/tests/nvme/059 b/tests/nvme/059
new file mode 100755
index 000000000000..24b2bec645a8
--- /dev/null
+++ b/tests/nvme/059
@@ -0,0 +1,147 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Oracle and/or its affiliates
+#
+# Test NVMe Atomic Writes
+
+. tests/nvme/rc
+. common/xfs
+
+DESCRIPTION="test atomic writes"
+QUICK=1
+
+requires() {
+	_nvme_requires
+	_have_program nvme
+	_have_xfs_io_atomic_write
+}
+
+device_requires() {
+	_require_device_support_atomic_writes
+}
+
+test_device() {
+	local ns_dev
+	local ctrl_dev
+	local queue_path
+	local nvme_awupf
+	local nvme_nsfeat
+	local nvme_nsabp
+	local atomic_max_bytes
+	local statx_atomic_max
+	local sysfs_atomic_max_bytes
+	local sysfs_atomic_unit_max_bytes
+	local sysfs_logical_block_size
+	local bytes_written
+	local bytes_to_write
+	local test_desc
+
+	echo "Running ${TEST_NAME}"
+	ns_dev=${TEST_DEV##*/}
+	ctrl_dev=${ns_dev%n*}
+	queue_path="${TEST_DEV_SYSFS}/queue/"
+
+	test_desc="TEST 1 - Verify sysfs attributes"
+
+	sysfs_logical_block_size=$(cat "$queue_path"/logical_block_size)
+	sysfs_max_hw_sectors_kb=$(cat "$queue_path"/max_hw_sectors_kb)
+	max_hw_bytes=$(( "$sysfs_max_hw_sectors_kb" * 1024 ))
+	sysfs_atomic_max_bytes=$(cat "$queue_path"/atomic_write_max_bytes)
+	sysfs_atomic_unit_max_bytes=$(cat "$queue_path"/atomic_write_unit_max_bytes)
+	sysfs_atomic_unit_min_bytes=$(cat "$queue_path"/atomic_write_unit_min_bytes)
+
+	if [ "$max_hw_bytes" -ge "$sysfs_atomic_max_bytes" ] &&
+		[ "$sysfs_atomic_max_bytes" -ge "$sysfs_atomic_unit_max_bytes" ] &&
+		[ "$sysfs_atomic_unit_max_bytes" -ge "$sysfs_atomic_unit_min_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $max_hw_bytes - $sysfs_max_hw_sectors_kb -" \
+			"$sysfs_atomic_max_bytes - $sysfs_atomic_unit_max_bytes -" \
+			"$sysfs_atomic_unit_min_bytes"
+	fi
+
+	test_desc="TEST 2 - Verify sysfs atomic_write_unit_max_bytes is consistent "
+	test_desc+="with NVMe AWUPF/NAWUPF"
+	nvme_nsfeat=$(nvme id-ns /dev/"${ns_dev}" | grep nsfeat | awk '{ print $3}')
+	nvme_nsabp=$((("$nvme_nsfeat" & 0x2) != 0))
+	if [ "$nvme_nsabp" = 1 ] # Check if NSABP is set
+	then
+		nvme_awupf=$(nvme id-ns /dev/"$ns_dev" | grep nawupf | awk '{ print $3}')
+		atomic_max_bytes=$(( ("$nvme_awupf" + 1) * "$sysfs_logical_block_size" ))
+	else
+		nvme_awupf=$(nvme id-ctrl /dev/"${ctrl_dev}" | grep awupf | awk '{ print $3}')
+		atomic_max_bytes=$(( ("$nvme_awupf" + 1) * "$sysfs_logical_block_size" ))
+	fi
+	if [ "$atomic_max_bytes" -le "$max_hw_bytes" ]
+	then
+		if [ "$atomic_max_bytes" = "$sysfs_atomic_max_bytes" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $nvme_nsabp - $atomic_max_bytes - $sysfs_atomic_max_bytes -" \
+				"$max_hw_bytes"
+		fi
+	else
+		if [ "$sysfs_atomic_max_bytes" = "$max_hw_bytes" ]
+		then
+			echo "$test_desc - pass"
+		else
+			echo "$test_desc - fail $nvme_nsabp - $atomic_max_bytes - $sysfs_atomic_max_bytes -" \
+				"$max_hw_bytes"
+		fi
+	fi
+
+	test_desc="TEST 3 - Verify statx is correctly reporting atomic_unit_max_bytes"
+	statx_atomic_max=$(run_xfs_io_xstat /dev/"$ns_dev" "stat.atomic_write_unit_max")
+	if [ "$sysfs_atomic_unit_max_bytes" = "$statx_atomic_max" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $statx_atomic_max - $sysfs_atomic_unit_max_bytes"
+	fi
+
+	test_desc="TEST 4 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes "\
+	test_desc+="with no RWF_ATOMIC"
+	# flag - pwritev2 should be succesful.
+        bytes_written=$(run_xfs_io_pwritev2 /dev/"$ns_dev" "$sysfs_atomic_unit_max_bytes")
+        if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
+        then
+                echo "$test_desc - pass"
+        else
+                echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
+        fi
+
+	test_desc="TEST 5 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with "
+	test_desc+="RWF_ATOMIC flag - pwritev2 should  be succesful"
+	bytes_written=$(run_xfs_io_pwritev2_atomic /dev/"$ns_dev" "$sysfs_atomic_unit_max_bytes")
+	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
+	fi
+
+	test_desc="TEST 6 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 1 logical "
+	test_desc+="block with no RWF_ATOMIC flag - pwritev2 should be succesful"
+	bytes_to_write=$(( "$sysfs_atomic_unit_max_bytes" + "$sysfs_logical_block_size" ))
+	bytes_written=$(run_xfs_io_pwritev2 /dev/"$ns_dev" "$bytes_to_write")
+	if [ "$bytes_written" = "$bytes_to_write" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $bytes_to_write"
+	fi
+
+	test_desc="TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + logical "
+	test_desc+="block with RWF_ATOMIC flag - pwritev2 should not be succesful"
+	bytes_written=$(run_xfs_io_pwritev2_atomic /dev/"$ns_dev" "$bytes_to_write")
+	if [ "$bytes_written" = "" ]
+	then
+		echo "$test_desc - pass"
+	else
+		echo "$test_desc - fail $bytes_written - $bytes_to_write"
+	fi
+
+	echo "Test complete"
+}
diff --git a/tests/nvme/059.out b/tests/nvme/059.out
new file mode 100644
index 000000000000..e803de35776f
--- /dev/null
+++ b/tests/nvme/059.out
@@ -0,0 +1,10 @@
+Running nvme/059
+TEST 1 - Verify sysfs attributes - pass
+TEST 2 - Verify sysfs atomic_write_unit_max_bytes is consistent with NVMe AWUPF/NAWUPF - pass
+TEST 3 - Verify statx is correctly reporting atomic_unit_max_bytes - pass
+TEST 4 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with no RWF_ATOMIC - pass
+TEST 5 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with RWF_ATOMIC flag - pwritev2 should  be succesful - pass
+TEST 6 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 1 logical block with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
+pwrite: Invalid argument
+TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + logical block with RWF_ATOMIC flag - pwritev2 should not be succesful - pass
+Test complete
-- 
2.43.5

Re: [PATCH v3 blktests 1/2] scsi/009: add atomic write tests

[Chaitanya Kulkarni]

On 2/5/25 15:10, Alan Adamson wrote:
> Tests basic atomic write functionality. If no scsi test device is provided,
> a scsi_debug device will be used. Testing areas include:
>
> - Verify sysfs atomic write attributes are consistent with
>    atomic write attributes advertised by scsi_debug.
> - Verify the atomic write paramters of statx are correct using
>    xfs_io.
> - Perform a pwritev2() (with and without RWF_ATOMIC flag) using
>    xfs_io:
>      - maximum byte size (atomic_write_unit_max_bytes)
>      - minimum byte size (atomic_write_unit_min_bytes)
>      - a write larger than atomic_write_unit_max_bytes
>      - a write smaller than atomic_write_unit_min_bytes
>
> Signed-off-by: Alan Adamson<alan.adamson@oracle.com>

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck

Re: [PATCH v3 blktests 2/2] nvme/059: add atomic write tests

[Chaitanya Kulkarni]

On 2/5/25 15:11, Alan Adamson wrote:
> Tests basic atomic write functionality using NVMe devices
> that support the AWUN and AWUPF Controller Atomic Parameters
> and NAWUN and NAWUPF Namespace Atomic Parameters.
>
> Testing areas include:
>
> - Verify sysfs atomic write attributes are consistent with
>    atomic write capablities advertised by the NVMe HW.
>
> - Verify the atomic write paramters of statx are correct using
>    xfs_io.
>
> - Perform a pwritev2() (with and without RWF_ATOMIC flag) using
>    xfs_io:
>      - maximum byte size (atomic_write_unit_max_bytes)
>      - a write larger than atomic_write_unit_max_bytes
>
> Signed-off-by: Alan Adamson<alan.adamson@oracle.com>

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck

Re: [PATCH v3 blktests 2/2] nvme/059: add atomic write tests

[John Garry]

On 05/02/2025 23:11, Alan Adamson wrote:
> Tests basic atomic write functionality using NVMe devices
> that support the AWUN and AWUPF Controller Atomic Parameters
> and NAWUN and NAWUPF Namespace Atomic Parameters.
> 
> Testing areas include:
> 
> - Verify sysfs atomic write attributes are consistent with
>    atomic write capablities advertised by the NVMe HW.
> 
> - Verify the atomic write paramters of statx are correct using
>    xfs_io.
> 
> - Perform a pwritev2() (with and without RWF_ATOMIC flag) using
>    xfs_io:
>      - maximum byte size (atomic_write_unit_max_bytes)
>      - a write larger than atomic_write_unit_max_bytes
> 
> Signed-off-by: Alan Adamson <alan.adamson@oracle.com>

Generally this looks ok, but some comments below.

> ---
>   tests/nvme/059     | 147 +++++++++++++++++++++++++++++++++++++++++++++
>   tests/nvme/059.out |  10 +++
>   2 files changed, 157 insertions(+)
>   create mode 100755 tests/nvme/059
>   create mode 100644 tests/nvme/059.out
> 
> diff --git a/tests/nvme/059 b/tests/nvme/059
> new file mode 100755
> index 000000000000..24b2bec645a8
> --- /dev/null
> +++ b/tests/nvme/059
> @@ -0,0 +1,147 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-3.0+
> +# Copyright (C) 2025 Oracle and/or its affiliates
> +#
> +# Test NVMe Atomic Writes
> +
> +. tests/nvme/rc
> +. common/xfs
> +
> +DESCRIPTION="test atomic writes"
> +QUICK=1
> +
> +requires() {
> +	_nvme_requires
> +	_have_program nvme
> +	_have_xfs_io_atomic_write
> +}
> +
> +device_requires() {
> +	_require_device_support_atomic_writes
> +}
> +
> +test_device() {
> +	local ns_dev
> +	local ctrl_dev
> +	local queue_path
> +	local nvme_awupf
> +	local nvme_nsfeat
> +	local nvme_nsabp
> +	local atomic_max_bytes
> +	local statx_atomic_max
> +	local sysfs_atomic_max_bytes
> +	local sysfs_atomic_unit_max_bytes
> +	local sysfs_logical_block_size
> +	local bytes_written
> +	local bytes_to_write
> +	local test_desc
> +
> +	echo "Running ${TEST_NAME}"
> +	ns_dev=${TEST_DEV##*/}
> +	ctrl_dev=${ns_dev%n*}
> +	queue_path="${TEST_DEV_SYSFS}/queue/"
> +
> +	test_desc="TEST 1 - Verify sysfs attributes"
> +
> +	sysfs_logical_block_size=$(cat "$queue_path"/logical_block_size)
> +	sysfs_max_hw_sectors_kb=$(cat "$queue_path"/max_hw_sectors_kb)
> +	max_hw_bytes=$(( "$sysfs_max_hw_sectors_kb" * 1024 ))
> +	sysfs_atomic_max_bytes=$(cat "$queue_path"/atomic_write_max_bytes)
> +	sysfs_atomic_unit_max_bytes=$(cat "$queue_path"/atomic_write_unit_max_bytes)
> +	sysfs_atomic_unit_min_bytes=$(cat "$queue_path"/atomic_write_unit_min_bytes)
> +
> +	if [ "$max_hw_bytes" -ge "$sysfs_atomic_max_bytes" ] &&
> +		[ "$sysfs_atomic_max_bytes" -ge "$sysfs_atomic_unit_max_bytes" ] &&
> +		[ "$sysfs_atomic_unit_max_bytes" -ge "$sysfs_atomic_unit_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $max_hw_bytes - $sysfs_max_hw_sectors_kb -" \
> +			"$sysfs_atomic_max_bytes - $sysfs_atomic_unit_max_bytes -" \
> +			"$sysfs_atomic_unit_min_bytes"
> +	fi
> +
> +	test_desc="TEST 2 - Verify sysfs atomic_write_unit_max_bytes is consistent "
> +	test_desc+="with NVMe AWUPF/NAWUPF"
> +	nvme_nsfeat=$(nvme id-ns /dev/"${ns_dev}" | grep nsfeat | awk '{ print $3}')
> +	nvme_nsabp=$((("$nvme_nsfeat" & 0x2) != 0))
> +	if [ "$nvme_nsabp" = 1 ] # Check if NSABP is set
> +	then
> +		nvme_awupf=$(nvme id-ns /dev/"$ns_dev" | grep nawupf | awk '{ print $3}')
> +		atomic_max_bytes=$(( ("$nvme_awupf" + 1) * "$sysfs_logical_block_size" ))
> +	else
> +		nvme_awupf=$(nvme id-ctrl /dev/"${ctrl_dev}" | grep awupf | awk '{ print $3}')
> +		atomic_max_bytes=$(( ("$nvme_awupf" + 1) * "$sysfs_logical_block_size" ))
> +	fi
> +	if [ "$atomic_max_bytes" -le "$max_hw_bytes" ]
> +	then
> +		if [ "$atomic_max_bytes" = "$sysfs_atomic_max_bytes" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $nvme_nsabp - $atomic_max_bytes - $sysfs_atomic_max_bytes -" \
> +				"$max_hw_bytes"
> +		fi
> +	else
> +		if [ "$sysfs_atomic_max_bytes" = "$max_hw_bytes" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $nvme_nsabp - $atomic_max_bytes - $sysfs_atomic_max_bytes -" \
> +				"$max_hw_bytes"
> +		fi
> +	fi
> +
> +	test_desc="TEST 3 - Verify statx is correctly reporting atomic_unit_max_bytes"

I suppose that you can also check atomic_unit_min_bytes

And min can be checked in other tests (when applicable).

> +	statx_atomic_max=$(run_xfs_io_xstat /dev/"$ns_dev" "stat.atomic_write_unit_max")
> +	if [ "$sysfs_atomic_unit_max_bytes" = "$statx_atomic_max" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $statx_atomic_max - $sysfs_atomic_unit_max_bytes"
> +	fi
> +
> +	test_desc="TEST 4 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes "\
> +	test_desc+="with no RWF_ATOMIC"
> +	# flag - pwritev2 should be succesful.
> +        bytes_written=$(run_xfs_io_pwritev2 /dev/"$ns_dev" "$sysfs_atomic_unit_max_bytes")
> +        if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
> +        then
> +                echo "$test_desc - pass"
> +        else
> +                echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
> +        fi
> +
> +	test_desc="TEST 5 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with "
> +	test_desc+="RWF_ATOMIC flag - pwritev2 should  be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2_atomic /dev/"$ns_dev" "$sysfs_atomic_unit_max_bytes")
> +	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
> +	fi
> +
> +	test_desc="TEST 6 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 1 logical "
> +	test_desc+="block with no RWF_ATOMIC flag - pwritev2 should be succesful"

I don't really see much value in this test. If this doesn't pass, then 
something is really wrong.

> +	bytes_to_write=$(( "$sysfs_atomic_unit_max_bytes" + "$sysfs_logical_block_size" ))
> +	bytes_written=$(run_xfs_io_pwritev2 /dev/"$ns_dev" "$bytes_to_write")
> +	if [ "$bytes_written" = "$bytes_to_write" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +	fi
> +
> +	test_desc="TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + logical "
> +	test_desc+="block with RWF_ATOMIC flag - pwritev2 should not be succesful"

nit: I really don't think that "succesful" is the proper spelling

> +	bytes_written=$(run_xfs_io_pwritev2_atomic /dev/"$ns_dev" "$bytes_to_write")
> +	if [ "$bytes_written" = "" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +	fi
> +
> +	echo "Test complete"
> +}
> diff --git a/tests/nvme/059.out b/tests/nvme/059.out
> new file mode 100644
> index 000000000000..e803de35776f
> --- /dev/null
> +++ b/tests/nvme/059.out
> @@ -0,0 +1,10 @@
> +Running nvme/059
> +TEST 1 - Verify sysfs attributes - pass
> +TEST 2 - Verify sysfs atomic_write_unit_max_bytes is consistent with NVMe AWUPF/NAWUPF - pass
> +TEST 3 - Verify statx is correctly reporting atomic_unit_max_bytes - pass
> +TEST 4 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with no RWF_ATOMIC - pass
> +TEST 5 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with RWF_ATOMIC flag - pwritev2 should  be succesful - pass
> +TEST 6 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 1 logical block with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +pwrite: Invalid argument
> +TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + logical block with RWF_ATOMIC flag - pwritev2 should not be succesful - pass
> +Test complete

Re: [PATCH v3 blktests 1/2] scsi/009: add atomic write tests

[John Garry]

On 05/02/2025 23:10, Alan Adamson wrote:
> Tests basic atomic write functionality. If no scsi test device is provided,
> a scsi_debug device will be used. Testing areas include:
> 
> - Verify sysfs atomic write attributes are consistent with
>    atomic write attributes advertised by scsi_debug.
> - Verify the atomic write paramters of statx are correct using
>    xfs_io.
> - Perform a pwritev2() (with and without RWF_ATOMIC flag) using
>    xfs_io:
>      - maximum byte size (atomic_write_unit_max_bytes)
>      - minimum byte size (atomic_write_unit_min_bytes)
>      - a write larger than atomic_write_unit_max_bytes
>      - a write smaller than atomic_write_unit_min_bytes
> 
> Signed-off-by: Alan Adamson <alan.adamson@oracle.com>

generally looks ok, thanks, but a couple of comments

> ---
>   common/rc          |   8 ++
>   common/xfs         |  58 ++++++++++++

I suppose that this common stuff could go in a separate prep patch, but 
it doesn't bother me too much

>   tests/scsi/009     | 229 +++++++++++++++++++++++++++++++++++++++++++++
>   tests/scsi/009.out |  18 ++++
>   4 files changed, 313 insertions(+)
>   create mode 100755 tests/scsi/009
>   create mode 100644 tests/scsi/009.out
> 
> diff --git a/common/rc b/common/rc
> index bcb215d35114..06c0a416e3e1 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -292,6 +292,14 @@ _require_test_dev_can_discard() {
>   	return 0
>   }
>   
> +_require_device_support_atomic_writes() {
> +	_require_test_dev_sysfs queue/atomic_write_max_bytes
> +	if (( $(< "${TEST_DEV_SYSFS}"/queue/atomic_write_max_bytes) == 0 )); then
> +		SKIP_REASONS+=("${TEST_DEV} does not support atomic write")
> +		return 1
> +	fi
> +}
> +
>   _test_dev_queue_get() {
>   	if [[ $1 = scheduler ]]; then
>   		sed -e 's/.*\[//' -e 's/\].*//' "${TEST_DEV_SYSFS}/queue/scheduler"
> diff --git a/common/xfs b/common/xfs
> index 569770fecd53..0b1ca7c29049 100644
> --- a/common/xfs
> +++ b/common/xfs
> @@ -6,6 +6,22 @@
>   
>   . common/shellcheck
>   
> +_have_xfs_io_atomic_write() {
> +	local s
> +
> +	_have_program xfs_io || return $?
> +
> +	# If the pwrite command supports the -A option then this version
> +	# of xfs_io supports atomic writes.
> +	s=$(xfs_io -c help | grep pwrite | awk '{ print $4}')
> +	if [[ $s == *"A"* ]];
> +	then
> +		return 0
> +	fi
> +	SKIP_REASONS+=("xfs_io does not support the -A option")
> +	return 1
> +}
> +
>   _have_xfs() {
>   	_have_fs xfs && _have_program mkfs.xfs
>   }
> @@ -52,3 +68,45 @@ _xfs_run_fio_verify_io() {
>   
>   	return "${rc}"
>   }
> +
> +# Use xfs_io to perform a non-atomic write using pwritev2().
> +# Args:    $1 - device to write to
> +#          $2 - number of bytes to write
> +# Returns: Number of bytes written
> +run_xfs_io_pwritev2() {
> +	local dev=$1
> +	local bytes_to_write=$2
> +	local bytes_written
> +
> +	# Perform write and extract out bytes written from xfs_io output
> +	bytes_written=$(xfs_io -d -C \
> +		"pwrite -b ${bytes_to_write} -V 1 -D 0 ${bytes_to_write}" \
> +		"$dev" | grep "wrote" | sed 's/\// /g' | awk '{ print $2 }')
> +	echo "$bytes_written"
> +}
> +
> +# Use xfs_io to perform an atomic write using pwritev2().
> +# Args:    $1 - device to write to
> +#          $2 - number of bytes to write
> +# Returns: Number of bytes written
> +run_xfs_io_pwritev2_atomic() {
> +	local dev=$1
> +	local bytes_to_write=$2
> +	local bytes_written
> +
> +	# Perform atomic write and extract out bytes written from xfs_io output
> +	bytes_written=$(xfs_io -d -C \
> +		"pwrite -b ${bytes_to_write} -V 1 -A -D 0 ${bytes_to_write}" \
> +		"$dev" | grep "wrote" | sed 's/\// /g' | awk '{ print $2 }')
> +	echo "$bytes_written"
> +}
> +
> +run_xfs_io_xstat() {
> +	local dev=$1
> +	local field=$2
> +	local statx_output
> +
> +	statx_output=$(xfs_io -c "statx -r -m 0x00010000" "$dev" | \
> +		grep "$field" | awk '{ print $3 }')
> +	echo "$statx_output"
> +}
> diff --git a/tests/scsi/009 b/tests/scsi/009
> new file mode 100755
> index 000000000000..b114d92dd3db
> --- /dev/null
> +++ b/tests/scsi/009
> @@ -0,0 +1,229 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-3.0+
> +# Copyright (C) 2025 Oracle and/or its affiliates
> +#
> +# Test SCSI Atomic Writes with scsi_debug
> +
> +. tests/scsi/rc
> +. common/scsi_debug
> +. common/xfs
> +
> +DESCRIPTION="test scsi atomic writes"
> +QUICK=1
> +
> +requires() {
> +	_have_driver scsi_debug
> +	_have_xfs_io_atomic_write
> +}
> +
> +device_requires() {
> +	_require_device_support_atomic_writes
> +}
> +
> +fallback_device() {
> +	local scsi_debug_params=(
> +		delay=0
> +		atomic_wr=1
> +	)
> +	if ! _configure_scsi_debug "${scsi_debug_params[@]}"; then
> +		return 1
> +		fi
> +	echo "/dev/${SCSI_DEBUG_DEVICES[0]}"
> +}
> +
> +cleanup_fallback_device() {
> +	_exit_scsi_debug
> +}
> +
> +test_device() {
> +	local scsi_debug_atomic_wr_max_length
> +	local scsi_debug_atomic_wr_gran
> +	local scsi_atomic_max_bytes
> +	local scsi_atomic_min_bytes
> +	local sysfs_max_hw_sectors_kb
> +	local max_hw_bytes
> +	local sysfs_logical_block_size
> +	local sysfs_atomic_max_bytes
> +	local sysfs_atomic_unit_max_bytes
> +	local sysfs_atomic_unit_min_bytes
> +	local statx_atomic_min
> +	local statx_atomic_max
> +	local bytes_to_write
> +	local bytes_written
> +	local test_desc
> +
> +	echo "Running ${TEST_NAME}"
> +
> +	sysfs_logical_block_size=$(< "${TEST_DEV_SYSFS}"/queue/logical_block_size)
> +	sysfs_max_hw_sectors_kb=$(< "${TEST_DEV_SYSFS}"/queue/max_hw_sectors_kb)
> +	max_hw_bytes=$(( "$sysfs_max_hw_sectors_kb" * 1024 ))
> +	sysfs_atomic_max_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_max_bytes)
> +	sysfs_atomic_unit_max_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_unit_max_bytes)
> +	sysfs_atomic_unit_min_bytes=$(< "${TEST_DEV_SYSFS}"/queue/atomic_write_unit_min_bytes)
> +	scsi_debug_atomic_wr_max_length=$(< /sys/module/scsi_debug/parameters/atomic_wr_max_length)
> +	scsi_debug_atomic_wr_gran=$(< /sys/module/scsi_debug/parameters/atomic_wr_gran)
> +	scsi_atomic_max_bytes=$(( "$scsi_debug_atomic_wr_max_length" * "$sysfs_logical_block_size" ))
> +	scsi_atomic_min_bytes=$(( "$scsi_debug_atomic_wr_gran" * "$sysfs_logical_block_size" ))
> +
> +	test_desc="TEST 1 - Verify sysfs atomic attributes"
> +	if [ "$max_hw_bytes" -ge "$sysfs_atomic_max_bytes" ] &&
> +		[ "$sysfs_atomic_max_bytes" -ge "$sysfs_atomic_unit_max_bytes" ] &&
> +		[ "$sysfs_atomic_unit_max_bytes" -ge "$sysfs_atomic_unit_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $max_hw_bytes - $sysfs_max_hw_sectors_kb -" \
> +			"$sysfs_atomic_max_bytes - $sysfs_atomic_unit_max_bytes -" \
> +			"$sysfs_atomic_unit_min_bytes"
> +	fi
> +
> +	test_desc="TEST 2 - check scsi_debug atomic_wr_max_length is the same as sysfs atomic_write_max_bytes"
> +	if [ "$scsi_atomic_max_bytes" -le "$max_hw_bytes" ]
> +	then
> +		if [ "$scsi_atomic_max_bytes" = "$sysfs_atomic_max_bytes" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $scsi_atomic_max_bytes - $max_hw_bytes -" \
> +				"$sysfs_atomic_max_bytes"
> +		fi
> +	else
> +		if [ "$sysfs_atomic_max_bytes" = "$max_hw_bytes" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $scsi_atomic_max_bytes - $max_hw_bytes -" \
> +				"$sysfs_atomic_max_bytes"
> +		fi
> +	fi
> +
> +	test_desc="TEST 3 - check sysfs atomic_write_unit_max_bytes <= scsi_debug atomic_wr_max_length"
> +	if (("$sysfs_atomic_unit_max_bytes" <= "$scsi_atomic_max_bytes"))
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $sysfs_atomic_unit_max_bytes - $scsi_atomic_max_bytes"
> +	fi
> +
> +	test_desc="TEST 4 - check sysfs atomic_write_unit_min_bytes = scsi_debug atomic_wr_gran"
> +	if [ "$sysfs_atomic_unit_min_bytes" = "$scsi_atomic_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $sysfs_atomic_unit_min_bytes - $scsi_atomic_min_bytes"
> +	fi
> +
> +	test_desc="TEST 5 - check statx stx_atomic_write_unit_min"
> +	statx_atomic_min=$(run_xfs_io_xstat "$TEST_DEV" "stat.atomic_write_unit_min")
> +	if [ "$statx_atomic_min" = "$scsi_atomic_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $statx_atomic_min - $scsi_atomic_min_bytes"
> +	fi
> +
> +	test_desc="TEST 6 - check statx stx_atomic_write_unit_max"
> +	statx_atomic_max=$(run_xfs_io_xstat "$TEST_DEV" "stat.atomic_write_unit_max")
> +	if [ "$statx_atomic_max" = "$sysfs_atomic_unit_max_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $statx_atomic_max - $sysfs_atomic_unit_max_bytes"
> +	fi
> +
> +	test_desc="TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes "
> +	test_desc+="with no RWF_ATOMIC flag - pwritev2 should be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$sysfs_atomic_unit_max_bytes")
> +	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
> +	fi
> +
> +	test_desc="TEST 8 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with "
> +	test_desc+="RWF_ATOMIC flag - pwritev2 should be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$sysfs_atomic_unit_max_bytes")
> +	if [ "$bytes_written" = "$sysfs_atomic_unit_max_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $sysfs_atomic_unit_max_bytes"
> +	fi
> +
> +	test_desc="TEST 9 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 "
> +	test_desc+="bytes with no RWF_ATOMIC flag - pwritev2 should be succesful"
> +	bytes_to_write=$(( "${sysfs_atomic_unit_max_bytes}" + "$sysfs_logical_block_size" ))
> +	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$bytes_to_write")
> +	if [ "$bytes_written" = "$bytes_to_write" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +	fi
> +
> +	test_desc="TEST 10 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 "
> +	test_desc+="bytes with RWF_ATOMIC flag - pwritev2 should not be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$bytes_to_write")
> +	if [ "$bytes_written" = "" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +	fi
> +
> +	test_desc="TEST 11 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes "
> +	test_desc+="with no RWF_ATOMIC flag - pwritev2 should be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$sysfs_atomic_unit_min_bytes")
> +	if [ "$bytes_written" = "$sysfs_atomic_unit_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $scsi_atomic_min_bytes"
> +	fi
> +
> +	test_desc="TEST 12 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes "
> +	test_desc+="with RWF_ATOMIC flag - pwritev2 should be succesful"
> +	bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$sysfs_atomic_unit_min_bytes")
> +	if [ "$bytes_written" = "$sysfs_atomic_unit_min_bytes" ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		echo "$test_desc - fail $bytes_written - $scsi_atomic_min_bytes"
> +	fi
> +
> +	test_desc="TEST 13 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 "
> +	test_desc+="bytes with no RWF_ATOMIC flag - pwritev2 should be succesful"

Again, I am not really sure that testing with RWF_ATOMIC has any value here.

> +	bytes_to_write=$(( "${sysfs_atomic_unit_min_bytes}" - "${sysfs_logical_block_size}" ))
> +	if [ "$bytes_to_write" = 0 ]
> +	then
> +		echo "$test_desc - pass"
> +		echo "pwrite: Invalid argument"
> +	else
> +		bytes_written=$(run_xfs_io_pwritev2 "$TEST_DEV" "$bytes_to_write")
> +		if [ "$bytes_written" = "$bytes_to_write" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +		fi
> +	fi
> +	test_desc="TEST 14 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 "
> +	test_desc+="bytes with RWF_ATOMIC flag - pwritev2 should fail"
> +	if [ "$bytes_to_write" = 0 ]
> +	then
> +		echo "$test_desc - pass"
> +	else
> +		bytes_written=$(run_xfs_io_pwritev2_atomic "$TEST_DEV" "$bytes_to_write")
> +		if [ "$bytes_written" = "" ]
> +		then
> +			echo "$test_desc - pass"
> +		else
> +			echo "$test_desc - fail $bytes_written - $bytes_to_write"
> +		fi
> +	fi
> +
> +	_exit_scsi_debug
> +
> +	echo "Test complete"
> +}
> diff --git a/tests/scsi/009.out b/tests/scsi/009.out
> new file mode 100644
> index 000000000000..e31416b93515
> --- /dev/null
> +++ b/tests/scsi/009.out
> @@ -0,0 +1,18 @@
> +Running scsi/009
> +TEST 1 - Verify sysfs atomic attributes - pass
> +TEST 2 - check scsi_debug atomic_wr_max_length is the same as sysfs atomic_write_max_bytes - pass
> +TEST 3 - check sysfs atomic_write_unit_max_bytes <= scsi_debug atomic_wr_max_length - pass
> +TEST 4 - check sysfs atomic_write_unit_min_bytes = scsi_debug atomic_wr_gran - pass
> +TEST 5 - check statx stx_atomic_write_unit_min - pass
> +TEST 6 - check statx stx_atomic_write_unit_max - pass
> +TEST 7 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +TEST 8 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes with RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +TEST 9 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +pwrite: Invalid argument
> +TEST 10 - perform a pwritev2 with size of sysfs_atomic_unit_max_bytes + 512 bytes with RWF_ATOMIC flag - pwritev2 should not be succesful - pass
> +TEST 11 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +TEST 12 - perform a pwritev2 with size of sysfs_atomic_unit_min_bytes with RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +TEST 13 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 bytes with no RWF_ATOMIC flag - pwritev2 should be succesful - pass
> +pwrite: Invalid argument
> +TEST 14 - perform a pwritev2 with a size of sysfs_atomic_unit_min_bytes - 512 bytes with RWF_ATOMIC flag - pwritev2 should fail - pass
> +Test complete