1#!/bin/bash 2# Check open filename arg using perf trace + vfs_getname (exclusive) 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 $0)"/lib/probe.sh 15 16skip_if_no_perf_probe || exit 2 17skip_if_no_perf_trace || exit 2 18[ "$(id -u)" = 0 ] || exit 2 19 20. "$(dirname $0)"/lib/probe_vfs_getname.sh 21 22trace_open_vfs_getname() { 23 evts="$(echo "$(perf list tracepoint 2>/dev/null | grep -E 'syscalls:sys_enter_open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/')" | sed ':a;N;s:\n:,:g')" 24 perf trace -e $evts touch $file 2>&1 | \ 25 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]+$" 26} 27 28add_probe_vfs_getname 29err=$? 30 31if [ $err -eq 1 ] ; then 32 skip_if_no_debuginfo 33 err=$? 34fi 35 36if [ $err -ne 0 ] ; then 37 exit $err 38fi 39 40file=$(mktemp /tmp/temporary_file.XXXXX) 41 42# Do not use whatever ~/.perfconfig file, it may change the output 43# via trace.{show_timestamp,show_prefix,etc} 44export PERF_CONFIG=/dev/null 45 46trace_open_vfs_getname 47err=$? 48rm -f ${file} 49cleanup_probe_vfs_getname 50exit $err 51