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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
ERR_CODE=0
if ! _have_program bpftrace; then
exit "$UBLK_SKIP_CODE"
fi
if ! _have_program fio; then
exit "$UBLK_SKIP_CODE"
fi
_prep_test "null" "ublk dispatch won't reorder IO for MQ"
dev_id=$(_add_ublk_dev -t null -q 2)
_check_add_dev $TID $?
dev_t=$(_get_disk_dev_t "$dev_id")
bpftrace trace/seq_io.bt "$dev_t" "W" 1 > "$UBLK_TMP" 2>&1 &
btrace_pid=$!
# Wait for bpftrace probes to be attached (BEGIN block prints BPFTRACE_READY)
for _ in $(seq 100); do
grep -q "BPFTRACE_READY" "$UBLK_TMP" 2>/dev/null && break
sleep 0.1
done
if ! kill -0 "$btrace_pid" 2>/dev/null; then
_cleanup_test "null"
exit "$UBLK_SKIP_CODE"
fi
# run fio over this ublk disk (pinned to CPU 0)
taskset -c 0 fio --name=write_seq \
--filename=/dev/ublkb"${dev_id}" \
--ioengine=libaio --iodepth=16 \
--rw=write \
--size=512M \
--direct=1 \
--bs=4k > /dev/null 2>&1
ERR_CODE=$?
kill "$btrace_pid"
wait
# Check for out-of-order completions detected by bpftrace
if grep -q "^out_of_order:" "$UBLK_TMP"; then
echo "I/O reordering detected:"
grep "^out_of_order:" "$UBLK_TMP"
ERR_CODE=255
fi
_cleanup_test "null"
_show_result $TID $ERR_CODE
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