1#!/bin/sh 2# Check open filename arg using perf trace + vfs_getname 3 4# Uses the 'perf test shell' library to add probe:vfs_getname to the system 5# then use it with 'perf trace' using 'touch' to write to a temp file, then 6# 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 the 8# "open" syscall "filename" argument beautifier. 9 10# SPDX-License-Identifier: GPL-2.0 11# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017 12 13# shellcheck source=lib/probe.sh 14. "$(dirname $0)"/lib/probe.sh 15 16skip_if_no_perf_probe || exit 2 17skip_if_no_perf_trace || exit 2 18 19. "$(dirname $0)"/lib/probe_vfs_getname.sh 20 21trace_open_vfs_getname() { 22 evts="$(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]+$" 25} 26 27 28add_probe_vfs_getname || skip_if_no_debuginfo 29err=$? 30if [ $err -ne 0 ] ; then 31 exit $err 32fi 33 34file=$(mktemp /tmp/temporary_file.XXXXX) 35 36# Do not use whatever ~/.perfconfig file, it may change the output 37# via trace.{show_timestamp,show_prefix,etc} 38export PERF_CONFIG=/dev/null 39 40trace_open_vfs_getname 41err=$? 42rm -f ${file} 43cleanup_probe_vfs_getname 44exit $err 45