selftests: ublk: add ublk auto integrity test

The end-to-end integrity ublk selftest test_integrity_02 requires a
relatively recent fio version to support I/O with integrity buffers. Add
a version test_integrity_03 that uses the block layer's auto integrity
path instead. The auto integrity code doesn't check the application tag,
and doesn't indicate the bad guard/ref tag (just returns EILSEQ). But
it's a good smoke-test of the ublk integrity code and provides coverage
of the auto integrity path as well.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Link: https://patch.msgid.link/20260421200901.1528842-4-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

tools/testing/selftests/ublk/Makefile

@@ -37,6 +37,7 @@ TEST_PROGS += test_loop_07.sh
 
 TEST_PROGS += test_integrity_01.sh
 TEST_PROGS += test_integrity_02.sh
+TEST_PROGS += test_integrity_03.sh
 
 TEST_PROGS += test_recover_01.sh
 TEST_PROGS += test_recover_02.sh

tools/testing/selftests/ublk/test_integrity_03.sh

@@ -0,0 +1,103 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
+
+if ! _have_program fio; then
+	exit $UBLK_SKIP_CODE
+fi
+
+_test_fill_and_verify() {
+	fio --name fill --rw randwrite $fio_args > /dev/null
+	if [ $? != 0 ]; then
+		echo "fio fill failed"
+		ERR_CODE=255
+		return 1
+	fi
+
+	fio --name verify --rw randread $fio_args > /dev/null
+	if [ $? != 0 ]; then
+		echo "fio verify failed"
+		ERR_CODE=255
+		return 1
+	fi
+}
+
+_test_corrupted_reftag() {
+	local dd_reftag_args="bs=1 seek=58 count=6 oflag=dsync conv=notrunc status=none"
+
+	# Overwrite 6-byte reftag at offset 48 + 10 = 58
+	dd if=/dev/urandom "of=${UBLK_BACKFILES[1]}" $dd_reftag_args
+	if [ $? != 0 ]; then
+		echo "dd corrupted_reftag failed"
+		ERR_CODE=255
+		return 1
+	fi
+
+	if fio --name corrupted_reftag --rw randread $fio_args > /dev/null 2> "$fio_err"; then
+		echo "fio corrupted_reftag unexpectedly succeeded"
+		ERR_CODE=255
+		return 1
+	fi
+
+	if ! grep -q "$expected_err" "$fio_err"; then
+		echo "fio corrupted_reftag message not found: $expected_err"
+		ERR_CODE=255
+		return 1
+	fi
+
+	# Reset to 0
+	dd if=/dev/zero "of=${UBLK_BACKFILES[1]}" $dd_reftag_args
+	if [ $? != 0 ]; then
+		echo "dd restore corrupted_reftag failed"
+		ERR_CODE=255
+		return 1
+	fi
+}
+
+_test_corrupted_data() {
+	local dd_data_args="bs=512 count=1 oflag=direct,dsync conv=notrunc status=none"
+
+	dd if=/dev/zero "of=${UBLK_BACKFILES[0]}" $dd_data_args
+	if [ $? != 0 ]; then
+		echo "dd corrupted_data failed"
+		ERR_CODE=255
+		return 1
+	fi
+
+	if fio --name corrupted_data --rw randread $fio_args > /dev/null 2> "$fio_err"; then
+		echo "fio corrupted_data unexpectedly succeeded"
+		ERR_CODE=255
+		return 1
+	fi
+
+	if ! grep -q "$expected_err" "$fio_err"; then
+		echo "fio corrupted_data message not found: $expected_err"
+		ERR_CODE=255
+		return 1
+	fi
+}
+
+_prep_test "loop" "end-to-end auto integrity"
+
+_create_backfile 0 256M
+_create_backfile 1 32M # 256M * (64 integrity bytes / 512 data bytes)
+integrity_params="--integrity_capable --integrity_reftag
+		  --metadata_size 64 --pi_offset 48 --csum_type nvme"
+dev_id=$(_add_ublk_dev -t loop -u $integrity_params "${UBLK_BACKFILES[@]}")
+_check_add_dev "$TID" $?
+
+fio_args="--ioengine libaio --direct 1 --bsrange 512-1M --iodepth 32
+	  --filename /dev/ublkb$dev_id"
+fio_err=$(mktemp "${UBLK_TEST_DIR}"/fio_err_XXXXX)
+ERR_CODE=0
+
+expected_err="Invalid or incomplete multibyte or wide character: read offset=0"
+_test_fill_and_verify && \
+_test_corrupted_reftag && \
+_test_corrupted_data
+
+rm -f "$fio_err"
+
+_cleanup_test
+_show_result "$TID" $ERR_CODE