scsi/008: Test SCSI disk data lifetime support

SCSI disk data lifetime support is available since kernel v6.9-rc1.
See also https://lore.kernel.org/linux-scsi/3b789eacddd6265921be9da6e15257908f29b186.camel@HansenPartnership.com/.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>

common/scsi_debug

@@ -25,6 +25,20 @@ _scsi_debug_key_path() {
  echo "$path"
 }
 
+_have_scsi_debug_group_number_stats() {
+ local ret=0
+
+ modprobe -qr scsi_debug >&/dev/null
+ if ! modprobe -q scsi_debug delay=0 >&/dev/null ||
+ ! [[ -e ${SD_PSEUDO_PATH}/group_number_stats ]]
+ then
+ SKIP_REASONS+=("scsi_debug does not support group number statistics")
+ ret=1
+ fi
+ modprobe -qr scsi_debug >&/dev/null
+ return ${ret}
+}
+
 declare -a SCSI_DEBUG_HOSTS
 declare -a SCSI_DEBUG_TARGETS
 declare -a SCSI_DEBUG_DEVICES

tests/scsi/008

@@ -0,0 +1,85 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2024 Google LLC
+
+. tests/scsi/rc
+. common/scsi_debug
+
+DESCRIPTION="test block data lifetime support"
+QUICK=1
+
+requires() {
+ _have_fio
+ _have_scsi_debug_group_number_stats
+ # For patch "Fall back to F_SET_RW_HINT if F_SET_FILE_RW_HINT is not
+ # supported"
+ # (https://github.com/axboe/fio/commit/0cfea592fedf0011e695a604a6961e9cbc1fe9b6).
+ _have_fio_ver 3 33
+}
+
+submit_io() {
+ local stats_attr=/sys/bus/pseudo/drivers/scsi_debug/group_number_stats
+ echo "$1 ($3)"
+ echo "$*" >>"${FULL}"
+ local direct_io=$2
+ echo 0 > "${stats_attr}" &&
+ local fio_args wh &&
+ for wh in none short medium long extreme; do
+ if [ "${direct_io}" = 0 ]; then
+ sync
+ echo 1 > /proc/sys/vm/drop_caches
+ fi
+ fio_args=(
+ --bs=4K
+ --buffer_pattern='"'"$wh"'"'
+ --direct="${direct_io}"
+ --disable_clat=1
+ --disable_slat=1
+ --end_fsync=$((1 - direct_io))
+ --filename="${dev}"
+ --group_reporting=1
+ --gtod_reduce=1
+ --ioengine="$3"
+ --ioscheduler=none
+ --name=whint_"$wh"
+ --norandommap
+ --rw=randwrite
+ --size=4M
+ --thread=1
+ --write_hint="$wh"
+ )
+ echo "fio ${fio_args[*]}" >>"${FULL}" 2>&1
+ fio "${fio_args[@]}" >>"${FULL}" 2>&1 || return $?
+ done &&
+ grep -v ' 0$' "${stats_attr}" >> "${FULL}"
+ while read -r group count; do
+ if [ "$count" -gt 0 ]; then echo "$group"; fi
+ done < "${stats_attr}"
+}
+
+test() {
+ echo "Running ${TEST_NAME}"
+
+ local scsi_debug_params=(
+ delay=0
+ dev_size_mb=1024
+ sector_size=4096
+ )
+ _configure_scsi_debug "${scsi_debug_params[@]}" &&
+ local dev="/dev/${SCSI_DEBUG_DEVICES[0]}" fail &&
+ ls -ldi "${dev}" >>"${FULL}" &&
+ submit_io "Direct I/O" 1 pvsync &&
+ submit_io "Direct I/O" 1 libaio &&
+ submit_io "Direct I/O" 1 io_uring &&
+ submit_io "Buffered I/O" 0 pvsync ||
+ fail=true
+
+ _exit_scsi_debug
+
+ if [ -z "$fail" ]; then
+ echo "Test complete"
+ else
+ echo "Test failed"
+ return 1
+ fi
+}

tests/scsi/008.out

@@ -0,0 +1,26 @@
+Running scsi/008
+Direct I/O (pvsync)
+1
+2
+3
+4
+5
+Direct I/O (libaio)
+1
+2
+3
+4
+5
+Direct I/O (io_uring)
+1
+2
+3
+4
+5
+Buffered I/O (pvsync)
+1
+2
+3
+4
+5
+Test complete