zbd/013: Test bio splitting for stacked drivers

Since there is no test yet in the blktests repository for dm-crypt, add
such a test. max_sectors_kb is set to a small value to enforce bio
splitting. This test not only tests dm-crypt zoned storage support but
also tests whether split bios are submitted in LBA order.

Signed-off-by: Bart Van Assche <[email protected]>

Author: bvanassche

tests/zbd/013

@@ -0,0 +1,87 @@
+#!/bin/bash -x
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2025 Google LLC
+
+. tests/zbd/rc
+. common/null_blk
+. common/scsi_debug
+
+DESCRIPTION="test bio splitting for stacked drivers"
+QUICK=1
+
+requires() {
+	_have_driver dm-crypt
+	_have_driver f2fs
+	_have_fio
+	_have_module null_blk
+	_have_module scsi_debug
+	_have_program cryptsetup
+	_have_program mkfs.f2fs
+}
+
+test() {
+	echo "Running ${TEST_NAME}"
+
+	local mount_dir="$TMPDIR/mnt"
+
+	local null_blk_params=(
+		blocksize=4096
+		completion_nsec=0
+		memory_backed=1
+		size=1024 # MB
+		submit_queues=1
+		power=1
+	)
+	_init_null_blk nr_devices=0 queue_mode=2 &&
+	_configure_null_blk nullb0 "${null_blk_params[@]}" || return $?
+	local cdev=/dev/nullb0
+	_configure_null_blk nullb1 "${null_blk_params[@]}" || return $?
+	local hdev=/dev/nullb1
+
+	local scsi_debug_params=(
+		delay=0
+		dev_size_mb=1024
+		sector_size=4096
+		zbc=host-managed
+		zone_nr_conv=0
+		zone_size_mb=2
+	)
+	_init_scsi_debug "${scsi_debug_params[@]}" &&
+	local zdev="/dev/${SCSI_DEBUG_DEVICES[0]}" fail &&
+	echo 4 > /sys/block/"$(basename "$zdev")"/queue/max_sectors_kb &&
+	local luks_passphrase=this-passphrase-is-not-secret &&
+	{ echo "${luks_passphrase}" |
+		  cryptsetup luksFormat --batch-mode "${zdev}" \
+			     --header $hdev; } &&
+	local luks_vol_name=zbd-013 &&
+	{ echo "${luks_passphrase}" |
+		  cryptsetup luksOpen \
+			     --batch-mode "${zdev}" "${luks_vol_name}" \
+			     --header $hdev; } &&
+	local luksdev="/dev/mapper/${luks_vol_name}" &&
+	ls -ld "${cdev}" "${zdev}" "${luksdev}" >>"${FULL}" &&
+	mkfs.f2fs -m "${cdev}" -c "${luksdev}" >>"${FULL}" 2>&1 &&
+	mkdir -p "${mount_dir}" &&
+	mount -t f2fs "${cdev}" "${mount_dir}" &&
+	local fio_args=(
+		--bs=64M
+		--size=256M
+		--directory="${mount_dir}"
+		--time_based
+		--runtime=30
+	) &&
+	_run_fio_verify_io "${fio_args[@]}" >>"${FULL}" 2>&1 ||
+	fail=true
+
+	umount "${mount_dir}" >>"${FULL}" 2>&1
+	cryptsetup luksClose "${luks_vol_name}"
+	_exit_scsi_debug
+	_exit_null_blk
+
+	if [ -z "$fail" ]; then
+		echo "Test complete"
+	else
+		echo "Test failed"
+		return 1
+	fi
+}

tests/zbd/013.out

@@ -0,0 +1,2 @@
+Running zbd/013
+Test complete