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. $(dirname $0)/lib/probe.sh 14 15skip_if_no_perf_probe || exit 2 16skip_if_no_perf_trace || exit 2 17 18. $(dirname $0)/lib/probe_vfs_getname.sh 19 20trace_open_vfs_getname() { 21 evts=$(echo $(perf list syscalls:sys_enter_open* 2>/dev/null | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/') 22 perf trace -e $evts touch $file 2>&1 | \ 23 egrep " +[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]+$" 24} 25 26 27add_probe_vfs_getname || skip_if_no_debuginfo 28err=$? 29if [ $err -ne 0 ] ; then 30 exit $err 31fi 32 33file=$(mktemp /tmp/temporary_file.XXXXX) 34 35# Do not use whatever ~/.perfconfig file, it may change the output 36# via trace.{show_timestamp,show_prefix,etc} 37export PERF_CONFIG=/dev/null 38 39trace_open_vfs_getname 40err=$? 41rm -f ${file} 42cleanup_probe_vfs_getname 43exit $err 44