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>

diff --git a/common/scsi_debug b/common/scsi_debug
index 4e64b931a3d8cbeba38622bf5a3a98ead9bb2e93..594883c957131d37765b5b1047b74d180f58cec4 100644 (file)
--- a/common/scsi_debug
+++ b/common/scsi_debug
@@ -25,6 +25,19 @@ _scsi_debug_key_path() {
        echo "$path"
 }
 
+_have_scsi_debug_group_number_stats() {
+       local ret=0
+
+       modprobe -qr scsi_debug >&/dev/null
+       modprobe -q scsi_debug delay=0 >&/dev/null
+       if ! [[ -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

diff --git a/tests/scsi/008 b/tests/scsi/008
new file mode 100755 (executable)
index 0000000..b895032
--- /dev/null
+++ b/tests/scsi/008
@@ -0,0 +1,81 @@
+#!/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_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 37
+}
+
+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 [ "${direct_io}" = 0 ]; then
+                       sync
+                       echo 1 > /proc/sys/vm/drop_caches
+               fi
+               fio_args=(
+                       --buffer_pattern='"'"$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 ${TEST_NAME}"
+
+       local scsi_debug_params=(
+               delay=0
+       )
+       _configure_scsi_debug "${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
+}

diff --git a/tests/scsi/008.out b/tests/scsi/008.out
new file mode 100644 (file)
index 0000000..25788fd
--- /dev/null
+++ b/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