45 lines · bash
1#!/bin/sh2# Check open filename arg using perf trace + vfs_getname3 4# Uses the 'perf test shell' library to add probe:vfs_getname to the system5# then use it with 'perf trace' using 'touch' to write to a temp file, then6# checks that that was captured by the vfs_getname was used by 'perf trace',7# that already handles "probe:vfs_getname" if present, and used in the8# "open" syscall "filename" argument beautifier.9 10# SPDX-License-Identifier: GPL-2.011# Arnaldo Carvalho de Melo <acme@kernel.org>, 201712 13# shellcheck source=lib/probe.sh14. "$(dirname $0)"/lib/probe.sh15 16skip_if_no_perf_probe || exit 217skip_if_no_perf_trace || exit 218 19. "$(dirname $0)"/lib/probe_vfs_getname.sh20 21trace_open_vfs_getname() {22 evts="$(echo "$(perf list syscalls:sys_enter_open* 2>/dev/null | grep -E 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/')" | sed ':a;N;s:\n:,:g')"23 perf trace -e $evts touch $file 2>&1 | \24 grep -E " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +\"?${file}\"?, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"25}26 27 28add_probe_vfs_getname || skip_if_no_debuginfo29err=$?30if [ $err -ne 0 ] ; then31 exit $err32fi33 34file=$(mktemp /tmp/temporary_file.XXXXX)35 36# Do not use whatever ~/.perfconfig file, it may change the output37# via trace.{show_timestamp,show_prefix,etc}38export PERF_CONFIG=/dev/null39 40trace_open_vfs_getname41err=$?42rm -f ${file}43cleanup_probe_vfs_getname44exit $err45